| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 6.8° | -7.8° | 10.9mm | 3.7 | 36 |
| February | 8.6° | -6.8° | 13.4mm | 4.4 | 42 |
| March | 15.2° | -2.3° | 23mm | 5.2 | 68 |
| April | 19.2° | 1.8° | 46.1mm | 7.5 | 82 |
| May | 23.7° | 6.9° | 74.1mm | 10.7 | 79 |
| June | 30.3° | 12.2° | 45.3mm | 7.9 | 71 |
| July | 33.5° | 15.5° | 40mm | 7.2 | 60 |
| August | 32.3° | 14.3° | 38.6mm | 6.8 | 65 |
| September | 28.4° | 9.7° | 28.7mm | 6.3 | 82 |
| October | 20.3° | 2.8° | 25.8mm | 5.3 | 89 |
| November | 12.8° | -3.1° | 14.7mm | 3.9 | 62 |
| December | 6.7° | -7.6° | 13.3mm | 3.3 | 36 |
January in Greeley averages a daily high of 6.8°C with nights around -7.8°C. Expect roughly 3.7 wet days totalling 10.9mm. Demanding conditions — pack for it and plan indoor options.
February in Greeley averages a daily high of 8.6°C with nights around -6.8°C. Expect roughly 4.4 wet days totalling 13.4mm. Demanding conditions — pack for it and plan indoor options.
March in Greeley averages a daily high of 15.2°C with nights around -2.3°C. Expect roughly 5.2 wet days totalling 23mm. Generally workable, with some weather to plan around.
April in Greeley averages a daily high of 19.2°C with nights around 1.8°C. Expect roughly 7.5 wet days totalling 46.1mm. Comfortable conditions for being outdoors all day.
May in Greeley averages a daily high of 23.7°C with nights around 6.9°C. Expect roughly 10.7 wet days totalling 74.1mm. Comfortable conditions for being outdoors all day.
June in Greeley averages a daily high of 30.3°C with nights around 12.2°C. Expect roughly 7.9 wet days totalling 45.3mm. Generally workable, with some weather to plan around.
July in Greeley averages a daily high of 33.5°C with nights around 15.5°C. Expect roughly 7.2 wet days totalling 40mm. Generally workable, with some weather to plan around.
August in Greeley averages a daily high of 32.3°C with nights around 14.3°C. Expect roughly 6.8 wet days totalling 38.6mm. Generally workable, with some weather to plan around.
September in Greeley averages a daily high of 28.4°C with nights around 9.7°C. Expect roughly 6.3 wet days totalling 28.7mm. Comfortable conditions for being outdoors all day.
October in Greeley averages a daily high of 20.3°C with nights around 2.8°C. Expect roughly 5.3 wet days totalling 25.8mm. Comfortable conditions for being outdoors all day.
November in Greeley averages a daily high of 12.8°C with nights around -3.1°C. Expect roughly 3.9 wet days totalling 14.7mm. Generally workable, with some weather to plan around.
December in Greeley averages a daily high of 6.7°C with nights around -7.6°C. Expect roughly 3.3 wet days totalling 13.3mm. Demanding conditions — pack for it and plan indoor options.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Greeley peaks at 89.
Based on 30 years of records, September–October scores highest for comfort in Greeley, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 33.5°C.
May is the wettest, averaging 74.1mm of rain across roughly 10.7 wet days.
December is the coolest month, with average daily highs around 6.7°C.