Streatham's winters are mild and frosty, with temperatures often hovering around freezing point, but occasionally dipping below -5°C in January. As spring approaches, temperatures gradually rise, reaching an average high of 17°C in April and May, before warming up further to a peak of 27°C in June. Summer is warm and sunny, with July being the hottest month, while autumn brings a slight cooling, with temperatures ranging from 6-15°C by September and November. Winters are relatively mild again, with temperatures stabilizing around 7-8°C by December.