Average annual temperature is 11.5 °C
Absolute maximum temperature: 39.6 °C
Absolute minimum temperature: -12.1 °C
Number of sunny days: 212 days
Number of rainy days: 143 days
Number of snow days: 10 days
Look at detailed online map of Gilliam County
* Weather data for Gilliam 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) | 12.3 | 12.1 | 13.5 | 28.1 | 33.2 | 33.4 | 35.7 | 39.6 | 30.8 | 23.6 | 18.0 | 16.3 |
| Average daytime temperature (°C) | 5.8 | 6.3 | 8.6 | 14.1 | 24.4 | 27.2 | 31.8 | 30.6 | 22.6 | 16.0 | 7.6 | 5.8 |
| Average temperature (°C) | 1.8 | 1.6 | 3.8 | 8.6 | 17.4 | 20.1 | 24.6 | 24.0 | 17.0 | 11.4 | 4.2 | 3.1 |
| Average night temperature (°C) | -0.8 | -1.6 | 0.2 | 4.3 | 12.0 | 14.4 | 18.2 | 18.4 | 12.6 | 7.5 | 1.5 | 1.1 |
| Absolute minimum temperature (°C) | -10.7 | -12.1 | -3.3 | -1.4 | 6.1 | 6.5 | 13.7 | 12.1 | 5.5 | -3.4 | -5.3 | -4.1 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 8.0 |
| Daylight mean duration (h) | 9.2 | 10.4 | 11.9 | 13.5 | 14.9 | 15.6 | 15.3 | 14.1 | 12.5 | 10.9 | 9.5 | 8.8 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 8.0 |
| Sunshine mean duration (h) | 4.9 | 6.5 | 8.3 | 9.6 | 12.3 | 13.4 | 13.9 | 11.4 | 9.6 | 8.4 | 5.0 | 2.5 |
| Precipitation (mm) | 25 | 17 | 34 | 45 | 21 | 3 | 2 | 17 | 26 | 25 | 35 | 63 |
| Sunny days | 12 | 19 | 11 | 8 | 18 | 26 | 30 | 24 | 20 | 18 | 15 | 11 |
| Rainy days | 14 | 7 | 18 | 22 | 13 | 4 | 1 | 7 | 10 | 13 | 14 | 20 |
| Snow days | 5 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
The best time to visit Gilliam County during the most sunny months:
Months with the longest average daylight duration in Gilliam County:
The largest precipitation sum in Gilliam County is at