Winters in Suwalki are harsh and cold, with temperatures often dropping below -20°C in January and February. The spring season brings a slow warming trend, with temperatures gradually increasing into April, when the average high reaches around 20°C. Summer is mild to warm, with July being the warmest month, averaging around 22°C. Autumn is similar to spring, with temperatures cooling down steadily from September to November. Frosts return in December, signaling the start of another cold winter.