Winters in Thornton Heath are cool and occasionally frosty, with temperatures often below freezing point. The coldest months, January and February, average around 4-6°C, while the warmer winter days can reach up to 14°C. As spring approaches, temperatures gradually rise, with March and April averaging around 7-8°C, but still experiencing chilly mornings. Summers are mild to warm, with June and July being the warmest months, averaging around 17-18°C, although occasional heatwaves can bring temperatures above 30°C. Autumn is generally mild, with temperatures ranging from 6-19°C, before dropping again in winter.