| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 9° | -6.8° | 11.4mm | 3.9 | 44 |
| February | 9.2° | -6.6° | 16.7mm | 4.5 | 44 |
| March | 14.3° | -1.8° | 30.5mm | 5.5 | 65 |
| April | 18.1° | 1.8° | 48.8mm | 7.5 | 79 |
| May | 22.8° | 7.1° | 68.6mm | 10.3 | 79 |
| June | 30.1° | 12.9° | 43.2mm | 7.7 | 72 |
| July | 33.5° | 16.5° | 48mm | 7.9 | 58 |
| August | 32.3° | 15.2° | 43.8mm | 8.4 | 62 |
| September | 28.3° | 10.2° | 29.2mm | 6 | 83 |
| October | 20.1° | 2.9° | 26.1mm | 5.6 | 89 |
| November | 13.7° | -2.5° | 14.3mm | 4.3 | 64 |
| December | 9° | -6.5° | 11.6mm | 3.9 | 44 |
January in Denver averages a daily high of 9°C with nights around -6.8°C. Expect roughly 3.9 wet days totalling 11.4mm. Demanding conditions — pack for it and plan indoor options.
February in Denver averages a daily high of 9.2°C with nights around -6.6°C. Expect roughly 4.5 wet days totalling 16.7mm. Demanding conditions — pack for it and plan indoor options.
March in Denver averages a daily high of 14.3°C with nights around -1.8°C. Expect roughly 5.5 wet days totalling 30.5mm. Generally workable, with some weather to plan around.
April in Denver averages a daily high of 18.1°C with nights around 1.8°C. Expect roughly 7.5 wet days totalling 48.8mm. Comfortable conditions for being outdoors all day.
May in Denver averages a daily high of 22.8°C with nights around 7.1°C. Expect roughly 10.3 wet days totalling 68.6mm. Comfortable conditions for being outdoors all day.
June in Denver averages a daily high of 30.1°C with nights around 12.9°C. Expect roughly 7.7 wet days totalling 43.2mm. Generally workable, with some weather to plan around.
July in Denver averages a daily high of 33.5°C with nights around 16.5°C. Expect roughly 7.9 wet days totalling 48mm. Generally workable, with some weather to plan around.
August in Denver averages a daily high of 32.3°C with nights around 15.2°C. Expect roughly 8.4 wet days totalling 43.8mm. Generally workable, with some weather to plan around.
September in Denver averages a daily high of 28.3°C with nights around 10.2°C. Expect roughly 6 wet days totalling 29.2mm. Comfortable conditions for being outdoors all day.
October in Denver averages a daily high of 20.1°C with nights around 2.9°C. Expect roughly 5.6 wet days totalling 26.1mm. Comfortable conditions for being outdoors all day.
November in Denver averages a daily high of 13.7°C with nights around -2.5°C. Expect roughly 4.3 wet days totalling 14.3mm. Generally workable, with some weather to plan around.
December in Denver averages a daily high of 9°C with nights around -6.5°C. Expect roughly 3.9 wet days totalling 11.6mm. 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. Denver peaks at 89.
Based on 30 years of records, September–October scores highest for comfort in Denver, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 33.5°C.
May is the wettest, averaging 68.6mm of rain across roughly 10.3 wet days.
January is the coolest month, with average daily highs around 9°C.