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Weather & Climate
Boulder, Colorado, United States
Overview
Climate data and monthly weather averages for Boulder.
Key Metrics
Annual Avg
10.3°C
Summer Avg
22.4°C
Winter Avg
-0.7°C
Record High
39.9°C
Record Low
-23.3°C
Annual Precipitation
449 mm
Avg Humidity
49%
Summer Humidity
42%
Winter Humidity
56%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 20.2° | -0.6° | -23.1° | 19.5 | 55% | 78 | 54.1 |
| Feb | 20.1° | -0.4° | -23.3° | 24.1 | 56% | 99 | 54.9 |
| Mar | 27.1° | 4.5° | -17.7° | 36.3 | 51% | 144 | 60.2 |
| Apr | 30.2° | 8.5° | -13.8° | 54 | 49% | 163 | 51.8 |
| May | 34.2° | 13.6° | -8.3° | 65.1 | 49% | 185 | 55.8 |
| Jun | 39.9° | 20.7° | 2.4° | 42.6 | 41% | 211 | 50.8 |
| Jul | 38.9° | 24.1° | 8.7° | 52.1 | 42% | 204 | 39.9 |
| Aug | 39° | 22.4° | 6.7° | 43.4 | 43% | 178 | 39.6 |
| Sep | 37.1° | 17.9° | -2.1° | 36 | 42% | 151 | 41.6 |
| Oct | 30.5° | 9.9° | -14.1° | 33.2 | 47% | 114 | 47.5 |
| Nov | 24.6° | 3.9° | -18.7° | 21.3 | 51% | 78 | 52.6 |
| Dec | 18.4° | -1.1° | -20.3° | 21.4 | 57% | 66 | 63.6 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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