The dry season (December to April) is dominated by hot, dry, harmattan wind. Dakar's annual rainfall of about 600 mm (24 in) occurs between June and October when maximum temperatures average 30 °C (86.0 °F) and minimums 24.2 °C (75.6 °F); December to February maximum temperatures average 25.7 °C (78.3 °F) and minimums 18 °C (64.4 °F). Interior temperatures are higher than along the coast (for example, average daily temperatures in Kaolack and Tambacounda for May are 30 °C (86.0 °F) and 32.7 °C (90.9 °F) respectively, compared to Dakar's 23.2 °C (73.8 °F) ), and rainfall increases substantially farther south, exceeding 1,500 mm (59.1 in) annually in some areas. In the far interior of the country, in the region of Tambacounda, particularly on the border of Mali, temperatures can reach as high as 54 °C (129.2 °F).