Winters in Ketrzyn are harsh and cold, with temperatures often dropping below freezing point. January and February are the coldest months, with average temperatures ranging from -3°C to 7°C and -23°C to 16°C respectively. Spring brings a slow warming trend, with March temperatures gradually rising towards 20°C and April averaging around 6°C. Summer is mild to warm, with June and July experiencing highs of up to 33°C and 31°C respectively, while August cools down slightly. Autumn brings another cooling trend, with September and October temperatures dropping back into the single digits and below zero by November.