Berwyn's winters are cold and snowy, with temperatures often below freezing, but occasional warm spells can bring temperatures up to around 10°C in January. February is typically the coldest month, with temperatures sometimes dropping as low as -22°C. Spring arrives slowly, with March warming up to average highs of around 6°C, and April sees a significant jump to around 10°C. Summer months are warm but not hot, with July and August averaging just over 23°C, while September cools down slightly before October, which brings temperatures back into the mid-teens. Winters return in November and December, with temperatures fluctuating between freezing and mild highs.