Winters in Horsham are cool and relatively mild, with temperatures fluctuating between freezing point and around 13°C. As the seasons transition into spring, temperatures gradually rise, reaching averages of 6-11°C by May. Summer months bring warmth, with July being the hottest month, averaging highs around 18°C. Autumn is characterised by moderate temperatures, ranging from 4-19°C, before dropping again to cool winter conditions. The temperature variation between seasons is moderate, with minimal extremes throughout the year.