Average annual temperature is 20.8 °C
Absolute maximum temperature: 39.6 °C
Absolute minimum temperature: -0.2 °C
Number of sunny days: 151 days
Number of rainy days: 214 days
Look at detailed online map of Round Lake
* Weather data for Round Lake 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) | 25.5 | 27.6 | 29.0 | 31.0 | 35.2 | 36.3 | 36.7 | 39.6 | 34.2 | 31.2 | 26.8 | 24.9 |
| Average daytime temperature (°C) | 19.4 | 22.1 | 23.7 | 26.6 | 29.4 | 31.7 | 33.5 | 35.8 | 30.7 | 26.4 | 20.5 | 16.8 |
| Average temperature (°C) | 13.9 | 16.6 | 18.0 | 20.5 | 23.1 | 25.9 | 28.0 | 29.7 | 25.2 | 20.7 | 15.3 | 12.3 |
| Average night temperature (°C) | 9.7 | 12.6 | 13.5 | 15.6 | 17.8 | 21.5 | 23.9 | 24.9 | 20.8 | 15.6 | 10.8 | 8.3 |
| Absolute minimum temperature (°C) | -0.2 | 1.5 | 0.7 | 10.0 | 11.6 | 19.1 | 21.8 | 22.9 | 15.8 | 9.2 | 1.6 | 0.6 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 |
| Daylight mean duration (h) | 10.4 | 11.1 | 12.0 | 12.9 | 13.7 | 14.1 | 13.9 | 13.2 | 12.4 | 11.4 | 10.6 | 10.2 |
| Daylight minimum duration (h) | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 |
| Sunshine mean duration (h) | 7.6 | 7.9 | 8.4 | 9.5 | 10.4 | 10.6 | 11.3 | 11.1 | 9.8 | 9.1 | 7.1 | 6.4 |
| Precipitation (mm) | 216 | 69 | 121 | 146 | 127 | 136 | 140 | 114 | 92 | 35 | 97 | 131 |
| Sunny days | 16 | 13 | 13 | 10 | 8 | 4 | 4 | 8 | 13 | 25 | 18 | 19 |
| Rainy days | 15 | 15 | 18 | 20 | 23 | 26 | 27 | 23 | 17 | 6 | 12 | 12 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Round Lake is at