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Weather & Climate
Boulder County, Colorado, United States
Overview
Available climate summaries for Boulder County. Origins and reference periods are unverified; stored values may include AI estimates. Treat these as estimates until independently verified.
Key Metrics
Annual Avg
3.7°C
Summer Avg
15.5°C
Winter Avg
-7.2°C
Record High
32.4°C
Record Low
-34.5°C
Annual Precipitation
532 mm
Avg Humidity
62%
Summer Humidity
50%
Winter Humidity
76%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 8° | -7.2° | -29.1° | 32.2 | 76% | 78 | 51.9 |
| Feb | 9.9° | -7.1° | -34.5° | 36.7 | 78% | 99 | 45.8 |
| Mar | 19° | -2.6° | -27° | 46.5 | 70% | 144 | 46.8 |
| Apr | 21.5° | 1.8° | -21.8° | 63.3 | 62% | 163 | 44.4 |
| May | 28.4° | 6.9° | -13.5° | 65.4 | 59% | 185 | 42.6 |
| Jun | 32.4° | 13.8° | -3.2° | 40.2 | 48% | 211 | 43.3 |
| Jul | 32° | 17.1° | 1.8° | 53.9 | 51% | 204 | 22.9 |
| Aug | 31.2° | 15.5° | 0.6° | 46.2 | 52% | 178 | 24.3 |
| Sep | 29.6° | 11.3° | -7.2° | 40.2 | 50% | 151 | 36.9 |
| Oct | 23.7° | 4° | -20.3° | 40.9 | 56% | 114 | 38.1 |
| Nov | 16.9° | -1.8° | -24.6° | 31.8 | 63% | 78 | 44.9 |
| Dec | 10.4° | -7.2° | -27.2° | 34.7 | 75% | 66 | 49.1 |
Data sources
Estimates and unverified origins
Oyster List climate data - Climate origins are unverified. Available methods include historical APIs and AI estimates; stored rows do not identify the original dataset, reference period, or model for each value. Treat these summaries as estimates until independently verified. Record updated 2026-03-22.
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