Winter is the wettest season of the year, when more than a third of the annual rainfall falls during this period, raining on average every two or three days.  The sun may still increase the temperature from  in the morning to  in the afternoon on average during the winter. Frosts are rare. The lowest temperature of  was recorded on 18th January 1979. In spring, rainfall declines by half.  The sunshine becomes dominant in May when it reaches 10 hours a day on average.  In March temperatures may vary between  and , and between  and  in May. However, it is common for temperatures to soar even as early as April with record temperatures reaching .  In summer, rain is almost completely absent and the sunlight is at a maximum.  The average temperatures in the summer months of June, July, August, and September are very high. Sea breezes may mitigate the heat, but sometimes the sirocco winds reverse the trend. Occasional thunderstorms in the afternoon can develop quickly, especially after the periods of extremely hot weather. They usually don't produce precipitation, but may be accompanied by a brief shower. The highest temperature of  was recorded on Tunis-Carthage International Airport on 10th August 2021. In autumn, it begins to rain, often with short thunderstorms, which can sometimes cause flash floods or even flood some parts of the city.  The month of November marks a break in the general heat with average temperatures ranging from  to .