Justice O’Connor
delivered the opinion of the Court.
This case requires us to determine precisely what effect the Florida courts gave to the evidence petitioner presented in mitigation of his death sentence, and consequently to determine whether his death sentence meets federal constitutional requirements.
I
On the afternoon of February 6, 1982, petitioner Robert Parker and several others set off to recover money owed them for the delivery of illegal drugs. There followed a nightmarish series of events that ended in the early morning hours of February 7 with the deaths of Richard Padgett, Jody Dalton, and Nancy Sheppard.
A Duval County, Florida, grand jury indicted Parker, his former wife Elaine, Tommy Groover, and William Long for the first-degree murders of Padgett, Dalton, and Sheppard. Elaine Parker and Long entered negotiated pleas to second-degree murder. A jury convicted Groover of all three first-degree murders, and the judge sentenced him to death on two counts and life imprisonment on the third.
Parker’s jury convicted him of first-degree murder for the killings of Padgett and Sheppard and third-degree murder for the Dalton killing. At the advisory sentencing hearing, Parker presented evidence in mitigation of a death sentence and argued that such evidence also had been presented at trial. The jury found that sufficient aggravating circumstances existed to justify a death sentence as to both the Padgett and Sheppard murders, but that sufficient mitigating circumstances existed that outweighed these aggravating factors. The jury therefore recommended that Parker be sentenced to life imprisonment on both first-degree counts.
The trial judge, who has ultimate sentencing authority under Florida law, accepted the jury’s recommendation for the Padgett murder. The judge overrode the jury’s recommendation for the Sheppard murder, however, and sentenced Parker to death. The judge’s sentencing order explained that “this Court has carefully studied and considered all the evidence and testimony at trial and at advisory sentence proceedings.” App. 47. After reviewing the evidence of the various aggravating and mitigating circumstances defined by Florida statute, the judge found six aggravating circumstances present as to the Sheppard murder and no statutory mitigating circumstances. In the sentencing order, the judge did not discuss evidence of, or reach any explicit conclusions concerning, nonstatutory mitigating evidence. He did conclude that “[t]here are no mitigating circumstances that outweigh the aggravating circumstances in the first count (Padgett murder) and the second count (Sheppard murder).” 7d.,at61.
On direct appeal, the Florida Supreme Court affirmed Parker’s convictions and sentences. Parker v. State, 458 So. 2d 750 (1984), cert. denied, 470 U. S. 1088 (1985). The court concluded, however, that there was insufficient evidence to support two of the aggravating circumstances that the trial judge had relied upon in sentencing Parker to death: that the Sheppard murder was “especially heinous, atrocious and cruel,” and that the murder was committed during a robbery. 458 So. 2d, at 754. Nonetheless, the court affirmed the death sentence, its entire written analysis consisting of the following:
“The trial court found no mitigating circumstances to balance against the aggravating factors, of which four were properly applied. In light of these findings the facts suggesting the sentence of death are so clear and convincing that virtually no reasonable person could differ. Tedder v. State, 322 So. 2d 908 (Fla. 1975). The jury override was proper and the facts of this case clearly place it within the class of homicides for which the death penalty has been found appropriate.” Ibid.
Parker pursued state collateral review without success, and then filed a petition for a writ of habeas corpus in the United States District Court for the Middle District of Florida. That court denied Parker’s petition as to his convictions, but granted the petition as to the imposition of the death penalty. App. 146. The court concluded that the trial judge had found no nonstatutory mitigating circumstances. The court also found that there was sufficient evidence in the record to support a finding of nonstatutory mitigating circumstances, and, in particular, to support the jury’s recommendation of a life sentence for the Sheppard murder. Because, under Florida law, a sentencing judge is to override a jury’s recommendation of life imprisonment only when “virtually no reasonable person could differ,” Tedder v. State, 322 So. 2d 908, 910 (Fla. 1975) (per curiam), the District Court concluded that the failure of the trial judge to find the presence of nonstatutory mitigating circumstances fairly supported by the record rendered the death sentence unconstitutional. App. 139-142. The District Court also speculated that the trial judge might have failed even to consider non-statutory mitigating circumstances, thereby violating the rule of Hitchcock v. Dugger, 481 U. S. 393 (1987). App. 143. The court ordered the State of Florida to hold a resentencing hearing within 120 days, or to vacate the death sentence and impose a lesser sentence. Id., at 146.
The Court of Appeals for the Eleventh Circuit reversed. 876 F. 2d 1470 (1989). That court agreed with the District Court that there was “copious evidence of nonstatutory mitigating circumstances presented by Parker during the sentencing phase.” Id., at 1475, n. 7. As a consequence, however, the Court of Appeals refused to read the trial judge’s silence as to nonstatutory mitigating circumstances as an indication that the judge did not consider or find such circumstances: “Under the facts of this case the only reasonable conclusion is that the trial judge found at least some mitigating factors to be present, but also found that they were outweighed by the aggravating factors also present. In his sentencing order, the judge wrote that ‘[tjhere are no mitigating circumstances that outweigh the aggravating circumstances in . . . the second count (Sheppard murder).’ (emphasis added).” Id., at 1475. The Court of Appeals found no constitutional error in Parker’s' convictions or death sentence. We granted certiorari, 497 U. S. 1023 (1990), and now reverse the judgment of the Court of Appeals and remand for further proceedings.
II
Parker presents several related challenges to his death sentence. The crux of his contentions is that the Florida courts acted in an arbitrary and capricious manner by failing to treat adequately the evidence he presented in mitigation of the sentence. This case is somewhat unusual in that we are required to reconstruct that which we are to review. The trial judge’s order imposing the challenged sentence does not state explicitly what effect the judge gave Parker’s nonstatu-tory mitigating evidence. We must first determine what precisely the trial judge found.
A Florida statute defines certain aggravating and mitigating circumstances relevant to the imposition of the death penalty. Fla. Stat. §§921.141(5), 921.141(6) (1985 and Supp. 1990). The death penalty may be imposed only where sufficient aggravating circumstances exist that outweigh mitigating circumstances. Fla. Stat. §921.141(3) (1985). A jury makes an initial sentencing recommendation to the judge; the judge imposes the sentence. §§921.141(2), 921.141(3). Both may consider only those aggravating circumstances described by statute. McCampbell v. State, 421 So. 2d 1072, 1075 (Fla. 1982) (per curiam). In counterbalance, however, they may consider any mitigating evidence, whether or not it goes to a statutory mitigating circumstance. Jacobs v. State, 396 So. 2d 713, 718 (Fla. 1981) (per curiam). If the jury recommends a life sentence rather than the death penalty, the judge may override that recommendation and impose a sentence of death only where “the facts suggesting a sentence of death [are] so clear and convincing that virtually no reasonable person could differ.” Tedder, supra, at 910.
The jury here recommended a life sentence for the Sheppard murder. The trial judge overrode that recommendation. In his sentencing order, the judge described in detail his factfinding as to each of the eight statutory aggravating and seven statutory mitigating circumstances. The judge found six aggravating circumstances present as to the Sheppard murder, and no statutory mitigating circumstances. App. 48-60. The sentencing order makes no specific mention of nonstatutory mitigating circumstances. Under “Findings of the Court,” the order states: “There are no mitigating circumstances that outweigh the aggravating circumstances.” Id., at 60-61.
What did the trial judge conclude about nonstatutory mitigating evidence? There is no question that Parker presented such evidence. For example, several witnesses at trial, including witnesses for the State, testified that Parker was under the influence of large amounts of alcohol and various drugs, including LSD, during the murders. Tr. 1401-1402, 1497, 1540-1541, 1619, 1738-1739, 1834, 1836, 1880-1881. At the sentencing hearing, Parker’s attorney emphasized to the jury that none of Parker’s accomplices received a death sentence for the Sheppard murder. Billy Long, who admitted shooting Nancy Sheppard, had been allowed to plead guilty to second-degree murder. Id., at 2366, 2378, 2491-2496. Finally, numerous witnesses testified on Parker’s behalf at the sentencing hearing concerning his background and character. Their testimony indicated both a difficult childhood, including an abusive, alcoholic father, and a positive adult relationship with his own children and with his neighbors. Id., at 2322-2360.
We must assume that the trial judge considered all this evidence before passing sentence. For one thing, he said he did. The sentencing order states: “Before imposing sentence, this Court has carefully studied and considered all the evidence and testimony at trial and at advisory sentence proceedings, the presentence Investigation Report, the applicable Florida Statutes, the case law, and all other factors touching upon this case.” App. 47 (emphasis added). Under both federal and Florida law, the trial judge could not refuse to consider any mitigating evidence. See Jacobs, supra, at 718; Songer v. State, 365 So. 2d 696, 700 (Fla. 1978) (per curiam), cert. denied, 441 U. S. 956 (1979); Eddings v. Oklahoma, 455 U. S. 104 (1982); Lockett v. Ohio, 438 U. S. 586 (1978) (plurality opinion). In his instructions to the jury concerning its sentencing recommendation, the judge explained that, in addition to the statutory mitigating factors, the jury could consider “[a]ny other aspect of the defendant’s character or record, and any other circumstances of the crime.” Tr. 2506-2507. Moreover, Parker’s nonstatutory mitigating evidence — drug and alcohol intoxication, more lenient sentencing for the perpetrator of the crime, character and background — was of a type that the Florida Supreme Court had in other cases found sufficient to preclude a jury override. See, for example, Norris v, State, 429 So. 2d 688, 690 (1983) (per curiam) (defendant claimed to be intoxicated); Buckrem v. State, 355 So. 2d 111, 113-114 (1978) (same); Malloy v. State, 382 So. 2d 1190, 1193 (1979) (per curiam) (lesser sentence for triggerman); McCampbell, supra, at 1075-1076 (background and character); Jacobs, supra, at 718 (same). The trial judge must have at least taken this evidence into account before passing sentence.
We also conclude that the trial judge credited much of this evidence, although he found that it did not outweigh the aggravating circumstances. The judge instructed the jurors at the end of the sentencing hearing that they need be only “reasonably convinced” that a mitigating circumstance exists to consider it established. Tr. 2507; Florida Bar, Florida Standard Jury Instructions in Criminal Cases 81 (1981 ed.). We assume the judge applied the same standard himself. He must, therefore, have found at least some nonstatutory mitigating circumstances. The evidence of Parker’s intoxication at the time of the murders was uncontroverted. There is also no question that Long, despite being the trig-german for the Sheppard murder, received a lighter sentence than Parker. Respondent conceded this fact in oral argument before this Court. See Tr. of Oral Arg. 35. And, as noted, there was extensive evidence going to Parker’s personal history and character that might have provided some mitigation.
In addition, every court to have reviewed the record here has determined that the evidence supported a finding of non-statutory mitigating circumstances. Both the District Court and the Court of Appeals, in reviewing Parker’s habeas petition, concluded that there was more than enough evidence in this record to support such a finding. See App. 141-142; 876 F. 2d, at 1475. We agree. We note also that the jury found sufficient mitigating circumstances to outweigh the aggravating circumstances in the Sheppard murder. The Florida Supreme Court did not make its own determination whether the evidence supported a finding of nonstatutory mitigating circumstances. See Parker, 458 So. 2d, at 754, quoted supra, at 311. To the extent there is ambiguity in the sentencing order, we will not read it to be against the weight of the evidence.
Perhaps the strongest indication that the trial judge found nonstatutory mitigating circumstances is that the judge overrode the jury’s sentencing recommendation for the Sheppard murder, but not for the Padgett murder. The jury recommended a life sentence for both murders. The judge explicitly found six aggravating circumstances related to the Sheppard murder and five aggravating circumstances related to the Padgett murder. App. 56-60. The judge found no statutory mitigating circumstances as to either murder. Id., at 48-56. Yet he sentenced Parker to death for the Sheppard murder, but accepted the jury’s recommendation as to the Padgett murder. If the judge had found no nonstatutory mitigating circumstances, he would have had nothing to balance against the aggravating circumstances for either murder, and the judge presumably would have overridden both recommendations.
It must be that the judge sentenced differentially for the two murders because he believed that the evidence in the Sheppard murder was so “clear and convincing that virtually no reasonable person could differ” about the sentence of death, see Tedder, 322 So. 2d, at 910, whereas the evidence in the Padgett murder did not meet this test. Perhaps this decision was based solely on the fact that the judge had found six aggravating circumstances in the Sheppard murder but only five in the Padgett murder. Far more likely, however, is that the judge found nonstatutory mitigating circumstances, at least as to the Padgett murder. But, as the nonstatutory mitigating evidence was in general directed to both murders, there is no reason to think the judge did not find mitigation as to both.
The best evidence that the trial judge did not find any nonstatutory mitigating circumstances is that the sentencing order contains detailed findings as to statutory mitigating circumstances, but makes no explicit reference to nonstatu-tory evidence. There is a likely explanation for this fact. By statute, the sentencing judge is required to set forth explicitly his findings as to only the statutory aggravating and mitigating circumstances. Fla. Stat. §921.141(3) (1985). Florida case law at the time the trial judge entered Parker’s sentencing order required no more. See Mason v. State, 438 So. 2d 374, 380 (Fla. 1983) (trial judge need not expressly address each nonstatutory mitigating circumstance), cert. denied, 465 U. S. 1051 (1984). Only very recently has the Florida Supreme Court established a requirement that a trial court must expressly evaluate in its sentencing order each nonstatutory mitigating circumstance proposed by the defendant. See Campbell v. State, 571 So. 2d 415 (1990). The absence of a requirement that the sentencing order contain specific findings as to nonstatutory mitigating circumstances probably explains why the order here discusses only those circumstances categorized by statute. Nonstatutory evidence, precisely because it does not fall into any predefined category, is considerably more difficult to organize into a coherent discussion; even though a more complete explanation is obviously helpful to a reviewing court, from the trial judge’s perspective it is simpler merely to conclude, in those cases where it is true, that such evidence taken together does not outweigh the aggravating circumstances. And so the judge did, stating that he found “no mitigating circumstances that outweigh the aggravating circumstances.” App. 61 (emphasis added). .
In light of the substantial evidence, much of it uncontro-verted, favoring mitigation, the differential sentences for the Sheppard and Padgett murders, and the fact that the judge indicated that he found no mitigating circumstances “that outweigh” aggravating circumstances, we must conclude, as did the Court of Appeals, that the trial court found and weighed nonstatutory mitigating circumstances before sentencing Parker to death.
Ill
The Florida Supreme Court did not consider the evidence of nonstatutory mitigating circumstances. On direct review of Parker’s sentence, the Florida Supreme Court struck two of the aggravating circumstances on which the trial judge had relied. The Supreme Court nonetheless upheld the death sentence because “[t]he trial court found no mitigating circumstances to balance against the aggravating factors.” Parker, 458 So. 2d, at 754. The Florida Supreme Court erred in its characterization of the trial judge’s findings, and consequently erred in its review of Parker’s sentence.
As noted, Florida is a weighing State; the death penalty may be imposed only where specified aggravating circumstances outweigh all mitigating circumstances. Fla. Stat. §921.141(3) (1985); McCampbell, 421 So. 2d, at 1075; Jacobs, 396 So. 2d, at 718. In a weighing State, when a reviewing court strikes one or more of the aggravating factors on which the sentencer relies, the reviewing court may, consistent with the Constitution, reweigh the remaining evidence or conduct a harmless error analysis. Clemons v. Mississippi, 494 U. S. 738, 741 (1990). It is unclear what the Florida Supreme Court did here. It certainly did not conduct an independent reweighing of the evidence. In affirming Parker’s sentence, the court explicitly relied on what it took to be the trial judge’s finding of no mitigating circumstances. Parker, supra, at 754. Had it conducted an independent review of the evidence, the court would have had no need for such reliance. More to the point, the Florida Supreme Court has made it clear on several occasions that it does not reweigh the evidence of aggravating and mitigating circumstances. See, e. g., Hudson v. State, 538 So. 2d 829, 831 (per curiam) (“It is not within this Court’s province to reweigh or reevaluate the evidence presented as to aggravating or mitigating circumstances”), cert. denied, 493 U. S. 875 (1989); Brown v. Waimwright, 392 So. 2d 1327, 1331-1332 (1981) (per curiam).
The Florida Supreme Court may have conducted a harmless error analysis. At the time it heard Parker’s appeal, this was its general practice in cases in which it had struck aggravating circumstances and the trial judge had found no mitigating circumstances. See Sireci v. State, 399 So. 2d 964, 971 (1981), cert. denied, 456 U. S. 984 (1982); Elledge v. State, 346 So. 2d 998, 1002-1003 (1977). Perhaps the Florida Supreme Court conducted a harmless error analysis here: Believing that the trial judge properly had found four aggravating circumstances, and no mitigating circumstances to weigh against them, the Florida Supreme Court may have determined that elimination of two additional aggravating circumstances would have made no difference to the sentence.
But, as we have explained, the trial judge must have found mitigating circumstances. The Florida Supreme Court’s practice in such cases — where the court strikes one or more aggravating circumstances relied on by the trial judge and mitigating circumstances are present — is to remand for a new sentencing hearing. See ibid. See also Moody v. State, 418 So. 2d 989, 995 (1982). Following Clemons, a reviewing court is not compelled to remand. It may instead reweigh the evidence or conduct a harmless error analysis based on what the sentencer actually found. What the Florida Supreme Court could not do, but what it did, was to ignore the evidence of mitigating circumstances in the record and misread the trial judge’s findings regarding mitigating circumstances, and affirm the sentence based on a mis-charaeterization of the trial judge’s findings.
In Wainwright v. Goode, 464 U. S. 78, 83-85 (1983), the Court held that a federal court on habeas review must give deference to a state appellate court’s resolution of an ambiguity in a state trial court statement. We did not decide in Goode whether the issue resolved by the state appellate court was . properly characterized as one of law or of fact. In this case, we conclude that a determination of what the trial judge found is an issue of historical fact. It depends on an examination of the transcript of the trial and sentencing hearing, and the sentencing order. This is not a legal issue; no determination of the legality of Parker’s sentence under Florida law necessarily follows from a resolution of the question of what the trial judge found.
Because it is a factual issue, the deference we owe is that designated by 28 U. S. C. § 2254. In ruling on a petition for a writ of habeas corpus, a federal court is not to overturn a factual conclusion of a state court, including a state appellate court, unless the conclusion is not “fairly supported by the record.” §2254(d)(8); Goode, supra, at 85. For the reasons stated, we find that the Florida Supreme Court’s conclusion that the trial judge found no mitigating circumstances is not fairly supported by the record in this case.
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“If a State has determined that death should be an available penalty for certain crimes, then it must administer that penalty in a way that can rationally distinguish between those individuals for whom death is an appropriate sanction and those for whom it is not.” Spaziano v. Florida, 468 U. S. 447, 460 (1984). The Constitution prohibits the arbitrary or irrational imposition of the death penalty. Id., at 466-467. We have emphasized repeatedly the crucial role of meaningful appellate review in ensuring that the death penalty is not imposed arbitrarily or irrationally. See, e. g., Clemons, supra, at 749 (citing cases); Gregg v. Georgia, 428 U. S. 153 (1976). We have held specifically that the Florida Supreme Court’s system of independent review of death sentences minimizes the risk of constitutional error, and have noted the “crucial protection” afforded by such review in jury override cases. Dobbert v. Florida, 432 U. S. 282, 295 (1977). See also Proffitt v. Florida, 428 U. S. 242, 253 (1976) (joint opinion of Stewart, Powell, and Stevens, JJ.); Spaziano, supra, at 465. The Florida Supreme Court did not conduct an independent review here. In fact, there is a sense in which the court did not review Parker’s sentence at all.
It cannot be gainsaid that meaningful appellate review requires that the appellate court consider the defendant’s actual record. “What is important... is an individualized determination on the basis of the character of the individual and the circumstances of the crime.” Zant v. Stephens, 462 U. S. 862, 879 (1983). See also Clemons, supra, at 749, 752; Barclay v. Florida, 463 U. S. 939, 958 (1983) (plurality opinion). The Florida Supreme Court affirmed Parker’s death sentence neither based on a review of the individual record in this case nor in reliance on the trial judge’s findings based on that record, but in reliance on some other nonexistent findings.
The jury found sufficient mitigating circumstances to outweigh the aggravating circumstances and recommended that Parker be sentenced to life imprisonment for the Sheppard murder. The trial judge found nonstatutory mitigating circumstances related to the Sheppard murder. The judge also declined to override the jury’s recommendation as to the Padgett murder, even though he found five statutory aggravating circumstances and no statutory mitigating circumstances related to that crime. The Florida Supreme Court then struck two of the aggravating circumstances on which the trial judge had relied. On these facts, the Florida Supreme Court’s affirmance of Parker’s death sentence based on four aggravating circumstances and the trial judge’s “finding” of no mitigating circumstances was arbitrary.
This is not simply an error in assessing the mitigating evidence. Had the Florida Supreme Court conducted its own examination of the trial and sentencing hearing records and concluded that there were no mitigating circumstances, a different question would be presented. Similarly, if the trial judge had found no mitigating circumstances and the Florida Supreme Court had relied on that finding, our review would be very different. Cf. Lewis v. Jeffers, 497 U. S. 764 (1990). But the Florida Supreme Court did not come to its own independent factual conclusion, and it did not rely on what the trial judge actually found; it relied on “findings” of the trial judge that bear no necessary relation to this case. After striking two aggravating circumstances, the Florida Supreme Court affirmed Parker’s death sentence without considering the mitigating circumstances. This affirmance was invalid because it deprived Parker of the individualized treatment to which he is entitled under the Constitution. See Clemons, 494 U. S., at 752.
V
We reverse the judgment of the Court of Appeals and remand with instructions to return the case to the District Court to enter an order directing the State of Florida to initiate appropriate proceedings in state court so that Parker’s death sentence may be reconsidered in light of the entire record of his trial and sentencing hearing and the trial judge’s findings. The District Court shall give the State a reasonable period of time to initiate such proceedings. We express no opinion as to whether the Florida courts must order a new sentencing hearing.
As to Parker’s remaining questions presented to this Court, his petition for a writ of certiorari is dismissed as improvidently granted.
It is so ordered.