Winters in Ewell are cold and unpredictable, with January being the coldest month, averaging around 4°C, while February is slightly warmer. Spring months bring gradual warming, with March marking a significant increase in temperatures, often reaching up to 23°C. Summer months are warm, but not excessively hot, with June and July typically averaging around 17-18°C. Autumn sees a return of cooler temperatures, with October being the second coolest month on average, but still relatively mild compared to winter.