Winters in Saint-Jerome are brutally cold, with temperatures often plummeting below -20°C and averaging around -6°C to -7°C. Mornings can be particularly chilly, while afternoons may see a slight warming trend, but still remain quite frigid. Spring is a slow and temperamental transition from cold to mild, with March temperatures fluctuating wildly before stabilizing in April, which brings average highs of 8°C. Summer months are generally pleasant, with July and August experiencing warm days averaging around 20-22°C, though nights can dip into the single digits. Autumn sees a gradual cooling trend, with September's warmth giving way to October's chill, eventually settling into November's cold, before winter's return in December.