Summers are dry but not completely devoid of rain, with sporadic rainfall in the form of short-lived thunderstorms, weak cold fronts and on occasions decaying tropical cyclones from Western Australia's northwest, which can bring heavy rain. Temperatures above are fairly common in the summer months. The highest temperature recorded in Perth was on 23 February 1991, although Perth Airport recorded on the same day. On most summer afternoons a sea breeze, known locally as the "Fremantle Doctor", blows from the southwest, providing relief from the hot northeasterly winds. Temperatures often fall below a few hours after the arrival of the wind change. In the summer, the 3 p.m. dewpoint averages at around .