The warmest month on record is July 1901 with mean , and the all-time high  was also recorded in July 1901. The warmest month in more recent years is July 2018 with mean  and average daily high . The record summer of 2018 also recorded the warmest May and May all-time high with  on 30th, and 2018 was even the sunniest year on record with 2133 sunhours.  On 27 July 2018, the temperature in Oslo rose to , the hottest recorded since 1937, when weather recordings started at Blindern. 