| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 7.3° | -7.5° | 10.8mm | 4.2 | 37 |
| February | 8.1° | -6.5° | 14.4mm | 5.2 | 39 |
| March | 13.3° | -2.1° | 33.5mm | 6.2 | 60 |
| April | 17° | 1.8° | 52.5mm | 8.9 | 72 |
| May | 21.5° | 6.7° | 74.9mm | 11.8 | 76 |
| June | 27.9° | 11.7° | 43mm | 9.3 | 78 |
| July | 31.2° | 15.1° | 43.1mm | 9.7 | 64 |
| August | 29.8° | 13.8° | 37.5mm | 8.4 | 72 |
| September | 25.7° | 9.2° | 35.4mm | 7.4 | 85 |
| October | 18.2° | 2.4° | 28.9mm | 5.7 | 83 |
| November | 12° | -3° | 16.8mm | 4.2 | 59 |
| December | 7.1° | -7.3° | 12mm | 3.8 | 37 |
January in Fort Collins averages a daily high of 7.3°C with nights around -7.5°C. Expect roughly 4.2 wet days totalling 10.8mm. Demanding conditions — pack for it and plan indoor options.
February in Fort Collins averages a daily high of 8.1°C with nights around -6.5°C. Expect roughly 5.2 wet days totalling 14.4mm. Demanding conditions — pack for it and plan indoor options.
March in Fort Collins averages a daily high of 13.3°C with nights around -2.1°C. Expect roughly 6.2 wet days totalling 33.5mm. Generally workable, with some weather to plan around.
April in Fort Collins averages a daily high of 17°C with nights around 1.8°C. Expect roughly 8.9 wet days totalling 52.5mm. Generally workable, with some weather to plan around.
May in Fort Collins averages a daily high of 21.5°C with nights around 6.7°C. Expect roughly 11.8 wet days totalling 74.9mm. Comfortable conditions for being outdoors all day.
June in Fort Collins averages a daily high of 27.9°C with nights around 11.7°C. Expect roughly 9.3 wet days totalling 43mm. Comfortable conditions for being outdoors all day.
July in Fort Collins averages a daily high of 31.2°C with nights around 15.1°C. Expect roughly 9.7 wet days totalling 43.1mm. Generally workable, with some weather to plan around.
August in Fort Collins averages a daily high of 29.8°C with nights around 13.8°C. Expect roughly 8.4 wet days totalling 37.5mm. Generally workable, with some weather to plan around.
September in Fort Collins averages a daily high of 25.7°C with nights around 9.2°C. Expect roughly 7.4 wet days totalling 35.4mm. Comfortable conditions for being outdoors all day.
October in Fort Collins averages a daily high of 18.2°C with nights around 2.4°C. Expect roughly 5.7 wet days totalling 28.9mm. Comfortable conditions for being outdoors all day.
November in Fort Collins averages a daily high of 12°C with nights around -3°C. Expect roughly 4.2 wet days totalling 16.8mm. Generally workable, with some weather to plan around.
December in Fort Collins averages a daily high of 7.1°C with nights around -7.3°C. Expect roughly 3.8 wet days totalling 12mm. 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. Fort Collins peaks at 85.
Based on 30 years of records, September–October scores highest for comfort in Fort Collins, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 31.2°C.
May is the wettest, averaging 74.9mm of rain across roughly 11.8 wet days.
December is the coolest month, with average daily highs around 7.1°C.