Winters in Sault Ste. Marie are extremely cold, with temperatures often plummeting below -20°C and averaging around -5°C in January, but slowly warming up by March when averages reach near-freezing. Spring brings a gradual increase in temperature, with April's average high of 5°C marking the beginning of a significant warming trend that continues through May and June. Summer is warm, with July and August temperatures frequently reaching highs above 25°C, although nighttime lows can still dip into single digits. Autumn sees a return to cooler conditions, with September's average temperature around 15°C giving way to a chillier November before winter sets in again.