Winters in Bicester are generally cool, with temperatures often below freezing and averaging around 4-7°C. Spring brings a gradual warming trend, with March and April experiencing mild temperatures ranging from -5 to 23°C, while May is warmer still, with averages reaching 11°C. Summers are warm to hot, with July being the hottest month, averaging 19°C, but also experiencing occasional heatwaves above 30°C. Autumns are generally mild, with October and November temperatures similar to those of spring, before cooling down again in December, which is around 7°C on average.