Winters in Bern are cold and snowy, with temperatures often below freezing, but occasional warm spells can bring temperatures up to 14°C in January. As spring approaches, temperatures gradually rise, with March and April averaging around 4-6°C, bringing mild days and chilly nights. Summer is warm and sunny, with June and July averaging a pleasant 17°C, while August can be slightly cooler. Autumn brings a return to chillier temperatures, with September and October experiencing occasional frosts and November being quite cool, before winter's icy grip returns. December often sees temperatures drop below -26°C, making it one of the coldest months of the year.