Average annual temperature is 11.3 °C
Absolute maximum temperature: 37.6 °C
Absolute minimum temperature: -19.8 °C
Number of sunny days: 254 days
Number of rainy days: 86 days
Number of snow days: 25 days
Look at detailed online map of San Juan County
* Weather data for San Juan County 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) | 9.4 | 11.7 | 16.1 | 25.5 | 28.7 | 33.6 | 37.6 | 34.4 | 32.1 | 26.9 | 21.8 | 8.9 |
| Average daytime temperature (°C) | 2.3 | 4.6 | 8.8 | 17.9 | 24.3 | 28.3 | 34.9 | 31.2 | 26.3 | 20.5 | 11.6 | 3.9 |
| Average temperature (°C) | -2.7 | -2.3 | 2.6 | 9.8 | 17.3 | 21.2 | 28.1 | 24.5 | 19.2 | 13.1 | 4.9 | -1.4 |
| Average night temperature (°C) | -7.1 | -7.3 | -2.4 | 2.2 | 9.7 | 12.8 | 19.3 | 17.4 | 12.1 | 5.7 | -1.1 | -5.5 |
| Absolute minimum temperature (°C) | -19.8 | -19.5 | -9.1 | -6.8 | 6.2 | 7.6 | 14.1 | 14.9 | 7.1 | -4.6 | -8.9 | -9.9 |
| 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 | 14.0 | 14.0 | 14.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.0 | 10.8 | 12.0 | 13.1 | 14.1 | 14.6 | 14.4 | 13.5 | 12.4 | 11.3 | 10.2 | 9.7 |
| 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) | 6.9 | 9.0 | 8.9 | 11.6 | 12.4 | 13.3 | 13.2 | 12.0 | 11.0 | 10.2 | 8.7 | 7.6 |
| Precipitation (mm) | 27 | 31 | 61 | 2 | 23 | 4 | 1 | 22 | 27 | 8 | 25 | 30 |
| Sunny days | 15 | 21 | 11 | 23 | 19 | 21 | 29 | 22 | 19 | 27 | 24 | 23 |
| Rainy days | 7 | 4 | 12 | 5 | 12 | 9 | 2 | 9 | 11 | 4 | 5 | 6 |
| Snow days | 9 | 3 | 8 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
The best time to visit San Juan County during the most sunny months:
The largest precipitation sum in San Juan County is at