Average annual temperature is 14.6 °C
Absolute maximum temperature: 40.0 °C
Absolute minimum temperature: -10.8 °C
Number of sunny days: 192 days
Number of rainy days: 170 days
Number of snow days: 3 days
Look at detailed online map of Sleeper
* Weather data for Sleeper 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) | 20.4 | 20.4 | 23.1 | 27.6 | 30.1 | 39.3 | 37.9 | 40.0 | 33.3 | 29.9 | 26.6 | 17.4 |
| Average daytime temperature (°C) | 8.9 | 12.1 | 13.1 | 20.4 | 25.3 | 30.1 | 32.1 | 31.2 | 28.1 | 20.5 | 15.0 | 10.8 |
| Average temperature (°C) | 3.6 | 5.4 | 6.9 | 13.5 | 19.0 | 23.4 | 25.9 | 25.1 | 21.5 | 15.2 | 8.9 | 5.9 |
| Average night temperature (°C) | -0.1 | 0.5 | 2.4 | 7.8 | 13.5 | 17.7 | 20.8 | 20.6 | 16.3 | 11.1 | 4.4 | 2.6 |
| Absolute minimum temperature (°C) | -10.8 | -9.7 | -7.4 | 0.7 | 5.6 | 11.2 | 16.2 | 14.0 | 11.7 | -2.4 | -5.0 | -4.4 |
| 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 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.9 | 10.8 | 12.0 | 13.2 | 14.2 | 14.7 | 14.5 | 13.6 | 12.4 | 11.2 | 10.2 | 9.6 |
| 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 | 7.3 | 7.3 | 10.5 | 10.7 | 12.7 | 11.6 | 10.6 | 10.7 | 8.0 | 7.5 | 6.1 |
| Precipitation (mm) | 55 | 97 | 200 | 51 | 80 | 70 | 69 | 125 | 66 | 71 | 19 | 72 |
| Sunny days | 18 | 15 | 12 | 18 | 13 | 16 | 12 | 14 | 16 | 20 | 23 | 15 |
| Rainy days | 12 | 11 | 19 | 12 | 18 | 14 | 19 | 17 | 14 | 11 | 7 | 16 |
| Snow days | 1 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Sleeper during the most sunny months:
The largest precipitation sum in Sleeper is at