Average annual temperature is 8.8 °C
Absolute maximum temperature: 35.0 °C
Absolute minimum temperature: -32.4 °C
Number of sunny days: 206 days
Number of rainy days: 118 days
Number of snow days: 41 days
Look at detailed online map of Longmont
* Weather data for Longmont United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 15.2 | 14.3 | 18.8 | 28.0 | 26.6 | 32.7 | 35.0 | 34.7 | 34.3 | 28.9 | 21.6 | 12.9 |
| Average daytime temperature (°C) | 0.7 | 5.3 | 9.1 | 17.0 | 22.1 | 23.9 | 29.6 | 29.0 | 26.2 | 18.7 | 11.6 | 6.9 |
| Average temperature (°C) | -4.3 | -3.2 | 1.0 | 7.5 | 14.4 | 17.1 | 21.4 | 20.8 | 17.1 | 10.2 | 2.6 | 0.0 |
| Average night temperature (°C) | -9.1 | -10.1 | -4.8 | 0.1 | 7.7 | 11.2 | 13.7 | 13.8 | 9.5 | 3.5 | -3.4 | -4.8 |
| Absolute minimum temperature (°C) | -24.9 | -32.4 | -12.5 | -8.7 | 3.4 | 8.5 | 9.2 | 10.7 | 5.0 | -16.0 | -12.2 | -10.6 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 15.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.7 | 10.7 | 12.0 | 13.3 | 14.4 | 15.0 | 14.7 | 13.7 | 12.5 | 11.1 | 10.0 | 9.4 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 5.7 | 8.3 | 9.2 | 10.5 | 10.1 | 10.8 | 12.5 | 11.1 | 10.8 | 9.2 | 7.7 | 6.7 |
| Precipitation (mm) | 31 | 22 | 21 | 48 | 156 | 168 | 62 | 94 | 35 | 16 | 16 | 10 |
| Sunny days | 17 | 21 | 16 | 17 | 8 | 7 | 12 | 15 | 20 | 24 | 25 | 24 |
| Rainy days | 4 | 1 | 5 | 8 | 23 | 23 | 19 | 16 | 10 | 5 | 3 | 1 |
| Snow days | 10 | 6 | 10 | 5 | 0 | 0 | 0 | 0 | 0 | 2 | 2 | 6 |
The best time to visit Longmont during the most sunny months:
The largest precipitation sum in Longmont is at