United States · urban-centre population 97,693
Boulder
Weather values are area-weighted across the 37 km² urban centre (1 ERA5 cells).
73.0
matching days / year for “Warm, not sweaty” · 2021-2025 recent-weather sample (not a 30-year normal)
Monthly high (p10–p90)
Whiskers span the 10th–90th percentile daily high; the tick marks the monthly average.
- January: average 2°C, p10 -5°C, p90 9°C
- February: average 3°C, p10 -6°C, p90 12°C
- March: average 8°C, p10 0°C, p90 15°C
- April: average 12°C, p10 2°C, p90 20°C
- May: average 17°C, p10 10°C, p90 24°C
- June: average 24°C, p10 18°C, p90 30°C
- July: average 28°C, p10 23°C, p90 32°C
- August: average 27°C, p10 22°C, p90 31°C
- September: average 24°C, p10 18°C, p90 29°C
- October: average 17°C, p10 10°C, p90 24°C
- November: average 10°C, p10 0°C, p90 18°C
- December: average 7°C, p10 -1°C, p90 14°C
Matching days by month · Warm, not sweaty
- January: 0.0 matching days per year
- February: 0.0 matching days per year
- March: 0.6 matching days per year
- April: 4.4 matching days per year
- May: 12.4 matching days per year
- June: 10.0 matching days per year
- July: 5.6 matching days per year
- August: 7.2 matching days per year
- September: 18.8 matching days per year
- October: 11.8 matching days per year
- November: 2.0 matching days per year
- December: 0.2 matching days per year
Presets
- Eternal spring: 43.8 days/yr
- Mild and dry: 67.0 days/yr
- Beach weather: 47.4 days/yr
- Crisp and clear: 44.8 days/yr
- Warm, not sweaty: 73.0 days/yr