Winters in Thun are cold and unpredictable, with temperatures often dropping below freezing point in January and February. Spring arrives slowly, with temperatures gradually warming up in March and April, but still experiencing occasional chilly nights. Summer months of June to August bring pleasant warmth, with average highs around 20-25°C, but days can occasionally feel cool due to the region's mountainous surroundings. Autumn is mild, with a gentle cooling trend from September to November, before winter returns with its characteristic chill. Overnight temperatures often require some protection during the colder months of December and January.