Average annual temperature is 14.9 °C
Absolute maximum temperature: 40.3 °C
Absolute minimum temperature: -14.0 °C
Number of sunny days: 256 days
Number of rainy days: 100 days
Number of snow days: 9 days
Look at detailed online map of Hartley County
* Weather data for Hartley 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) | 20.2 | 22.1 | 25.1 | 30.7 | 32.9 | 39.3 | 40.3 | 39.1 | 38.7 | 28.8 | 26.3 | 21.2 |
| Average daytime temperature (°C) | 10.7 | 14.1 | 17.2 | 23.1 | 26.2 | 29.9 | 34.8 | 34.8 | 30.8 | 21.6 | 15.9 | 11.7 |
| Average temperature (°C) | 3.6 | 5.1 | 8.6 | 14.0 | 18.9 | 22.0 | 26.9 | 27.5 | 23.5 | 14.6 | 8.4 | 4.8 |
| Average night temperature (°C) | -1.5 | -0.9 | 2.0 | 6.8 | 12.7 | 15.8 | 20.0 | 20.6 | 17.0 | 8.8 | 2.9 | 0.2 |
| Absolute minimum temperature (°C) | -14.0 | -9.8 | -5.6 | -3.2 | 6.7 | 11.0 | 15.8 | 16.7 | 12.3 | -5.9 | -4.6 | -4.9 |
| 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 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.0 | 10.9 | 12.0 | 13.1 | 14.1 | 14.6 | 14.3 | 13.5 | 12.4 | 11.3 | 10.3 | 9.8 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 7.8 | 9.1 | 9.9 | 11.3 | 11.0 | 11.9 | 12.5 | 11.9 | 10.5 | 9.3 | 8.2 | 7.8 |
| Precipitation (mm) | 10 | 13 | 10 | 38 | 95 | 64 | 57 | 9 | 22 | 30 | 13 | 46 |
| Sunny days | 24 | 21 | 23 | 24 | 11 | 12 | 16 | 25 | 23 | 25 | 27 | 25 |
| Rainy days | 4 | 5 | 6 | 6 | 20 | 18 | 15 | 6 | 7 | 6 | 1 | 6 |
| Snow days | 3 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 |
The largest precipitation sum in Hartley County is at