Average annual temperature is 11.6 °C
Absolute maximum temperature: 37.3 °C
Absolute minimum temperature: -24.1 °C
Number of sunny days: 190 days
Number of rainy days: 156 days
Number of snow days: 19 days
Look at detailed online map of Rock Falls
* Weather data for Rock Falls 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) | 10.5 | 12.8 | 21.7 | 25.5 | 32.2 | 36.3 | 35.0 | 37.3 | 34.3 | 28.8 | 19.1 | 14.6 |
| Average daytime temperature (°C) | 2.4 | 5.0 | 8.3 | 17.1 | 24.2 | 29.5 | 29.0 | 28.8 | 25.4 | 17.4 | 9.9 | 6.7 |
| Average temperature (°C) | -1.6 | -0.6 | 2.9 | 10.1 | 17.5 | 22.8 | 23.4 | 23.2 | 20.0 | 12.7 | 4.8 | 2.9 |
| Average night temperature (°C) | -4.6 | -5.1 | -1.1 | 4.5 | 11.3 | 16.4 | 18.2 | 18.4 | 15.7 | 8.9 | 0.7 | 0.3 |
| Absolute minimum temperature (°C) | -24.1 | -21.7 | -11.9 | -2.1 | 1.8 | 8.3 | 14.2 | 11.7 | 9.4 | -1.8 | -11.4 | -8.0 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 13.0 | 14.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.5 | 10.6 | 11.9 | 13.3 | 14.5 | 15.2 | 14.9 | 13.8 | 12.5 | 11.1 | 9.9 | 9.2 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 3.7 | 7.3 | 6.8 | 9.5 | 11.3 | 12.7 | 12.3 | 11.2 | 9.1 | 7.5 | 7.2 | 4.2 |
| Precipitation (mm) | 76 | 88 | 101 | 88 | 70 | 20 | 84 | 44 | 80 | 110 | 26 | 66 |
| Sunny days | 12 | 16 | 16 | 14 | 21 | 17 | 13 | 18 | 12 | 14 | 20 | 17 |
| Rainy days | 11 | 8 | 13 | 16 | 10 | 13 | 18 | 13 | 18 | 16 | 7 | 13 |
| Snow days | 8 | 4 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 1 |
The best time to visit Rock Falls during the most sunny months:
The largest precipitation sum in Rock Falls is at