The city's location in the Sichuan Basin causes it to have one of the lowest annual sunshine totals nationally, at only 1,055 hours, lower than much of Northern Europe; the monthly percent possible sunshine in the city proper ranges from a mere 8% in December and January to 48% in August. Extremes since 1951 have ranged from −1.8 °C (29 °F) on 15 December 1975 (unofficial record of −2.5 °C (27 °F) was set on 8 February 1943) to 43.0 °C (109 °F) on 15 August 2006 (unofficial record of 44.0 °C (111 °F) was set on 8 and 9 August 1933).[51]