Chateauguay's winters are long and cold, with temperatures often plummeting below -20°C in January and February. As the season transitions into spring, temperatures gradually rise, reaching averages around 0°C by March and 8°C by April. Summer months bring warm weather, with July and August averaging highs around 22-23°C, while September sees a slight cooldown. Autumn is characterized by moderate temperatures, ranging from -1 to 23°C, before dropping back into winter's chill in November and December. Overall, the region experiences significant temperature fluctuations throughout the year, with cold winters giving way to warm summers.