Swindon's winters are chilly and unpredictable, with temperatures often dropping below freezing in January and February. Spring brings a slow warming trend, with March and April temperatures gradually increasing towards the mid-teens. Summer months of June, July, and August are warm to hot, with average highs often reaching into the late 20s Celsius. Autumn is generally mild, with September and October temperatures similar to those in spring. Winters tend to be cold but not extreme, with December temperatures averaging just above freezing.