Winters in Greeley are extremely cold, with temperatures often dropping below freezing and averaging around 0°C in January. Spring is a gradual warming trend, with temperatures slowly increasing as the months progress from March's average of 4°C to April's 8°C. Summer brings warm days, but not excessively hot, with July and August averaging around 24°C. Autumn sees a noticeable cooling trend, with October's average temperature dropping back down to 11°C, mirroring the pattern seen in spring.