Kastamonu's winters are cold and variable, with temperatures often dropping below 0°C in January and February. Spring brings mild temperatures, gradually warming up to around 20°C by April. Summers are warm to hot, with July being the hottest month, averaging highs of 39°C. Autumn is generally cooler, with temperatures ranging from 5-25°C in September and October, before dropping again in November and December. The coldest months are January and February, with an average temperature around 6°C, while summer months see a significant increase to averages above 20°C.