| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 8.4° | -7.9° | 15.3mm | 5.3 | 37 |
| February | 8.8° | -7.5° | 22.1mm | 6.1 | 38 |
| March | 13.3° | -3.4° | 37mm | 7 | 56 |
| April | 16.7° | 0.3° | 58.2mm | 8.8 | 69 |
| May | 21.6° | 5.8° | 73.3mm | 10.2 | 80 |
| June | 28.2° | 10.8° | 41.6mm | 8.1 | 79 |
| July | 31.7° | 14.1° | 47.6mm | 8.6 | 64 |
| August | 30.4° | 12.7° | 38.2mm | 8.2 | 70 |
| September | 26.4° | 7.7° | 35.8mm | 6.8 | 86 |
| October | 19° | 1.1° | 28.9mm | 5.6 | 84 |
| November | 13.2° | -4° | 19.5mm | 5.2 | 59 |
| December | 8.3° | -8° | 17.7mm | 4.9 | 38 |
January in Arvada averages a daily high of 8.4°C with nights around -7.9°C. Expect roughly 5.3 wet days totalling 15.3mm. Demanding conditions — pack for it and plan indoor options.
February in Arvada averages a daily high of 8.8°C with nights around -7.5°C. Expect roughly 6.1 wet days totalling 22.1mm. Demanding conditions — pack for it and plan indoor options.
March in Arvada averages a daily high of 13.3°C with nights around -3.4°C. Expect roughly 7 wet days totalling 37mm. Generally workable, with some weather to plan around.
April in Arvada averages a daily high of 16.7°C with nights around 0.3°C. Expect roughly 8.8 wet days totalling 58.2mm. Generally workable, with some weather to plan around.
May in Arvada averages a daily high of 21.6°C with nights around 5.8°C. Expect roughly 10.2 wet days totalling 73.3mm. Comfortable conditions for being outdoors all day.
June in Arvada averages a daily high of 28.2°C with nights around 10.8°C. Expect roughly 8.1 wet days totalling 41.6mm. Comfortable conditions for being outdoors all day.
July in Arvada averages a daily high of 31.7°C with nights around 14.1°C. Expect roughly 8.6 wet days totalling 47.6mm. Generally workable, with some weather to plan around.
August in Arvada averages a daily high of 30.4°C with nights around 12.7°C. Expect roughly 8.2 wet days totalling 38.2mm. Generally workable, with some weather to plan around.
September in Arvada averages a daily high of 26.4°C with nights around 7.7°C. Expect roughly 6.8 wet days totalling 35.8mm. Comfortable conditions for being outdoors all day.
October in Arvada averages a daily high of 19°C with nights around 1.1°C. Expect roughly 5.6 wet days totalling 28.9mm. Comfortable conditions for being outdoors all day.
November in Arvada averages a daily high of 13.2°C with nights around -4°C. Expect roughly 5.2 wet days totalling 19.5mm. Generally workable, with some weather to plan around.
December in Arvada averages a daily high of 8.3°C with nights around -8°C. Expect roughly 4.9 wet days totalling 17.7mm. 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. Arvada peaks at 86.
Based on 30 years of records, May–June scores highest for comfort in Arvada, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 31.7°C.
May is the wettest, averaging 73.3mm of rain across roughly 10.2 wet days.
December is the coolest month, with average daily highs around 8.3°C.