In spring temperatures are warmer, although occasional morning frosts still can continue well into October. September is usually a pleasantly mild but windy month, and by late October with increasing heat and humidity the thunderstorm season is starting with increasing rainfalls. The spring months produce the most variable weather of the year. A week of very warm sunny weather can be followed by several milder days with temperatures right back at winter levels before gradually warming up again. This cycle often repeats itself many times until the start of summer.