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1 Â°C. In most years, Denver averages a daily maximum temperature for April that's between 56 and 66 degrees Fahrenheit (13 to 19 degrees Celsius). The minimum temperature usually falls between 31 and 37 Â°F (0 to 3 Â°C).The days at Denver continue warming during April.early every day in April warms to over 40 Â°F (4 Â°C) in Denver. The city averages 8 days this month when the thermometer reaches into the 70s Â°F (over 21 Â°C).
We endured 73 days over 90 degrees and 13 days of 100 degrees or more (in the last 140 years, there have been only 83 days of 100 degree temperatures in the Denver area). And because drought accompanied the heat, 62 of Coloradoâs 64 counties were declared crop disaster areas by the US Secretary of Agriculture.