Winters in Bletchley are typically cool and occasionally cold, with January averaging just 3°C. Spring brings a gradual warming trend, with temperatures rising steadily through March and April, but still experiencing chilly mornings. Summer months are warm to hot, with July often seeing highs above 30°C, though the mercury can drop sharply at night even in the peak summer month. Autumn is generally mild, with September and October temperatures similar to those of spring, before cooling down towards winter again.