Grande Prairie's winters are long and bitterly cold, with temperatures often plummeting below -30°C in January and February. The coldest months bring average lows of around -18°C in February, but daytime highs can occasionally rise above freezing. Spring arrives slowly, with March temperatures gradually warming up to averages of around 0°C. Summer brings warm days, with June and July temperatures frequently reaching the mid-20s to low 30s Celsius, while August can see occasional heatwaves. Autumn is mild, with September and October daytime highs often hovering around 10-15°C before dropping again as winter sets in.