Average annual temperature is 9.1 °C
Absolute maximum temperature: 35.9 °C
Absolute minimum temperature: -27.2 °C
Number of sunny days: 194 days
Number of rainy days: 140 days
Number of snow days: 31 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) | 4.3 | 6.9 | 9.0 | 27.1 | 31.3 | 32.3 | 32.0 | 35.9 | 35.2 | 29.8 | 17.4 | 13.0 |
| Average daytime temperature (°C) | -2.0 | 0.6 | 4.3 | 12.8 | 22.6 | 28.2 | 27.7 | 27.5 | 24.4 | 15.1 | 7.4 | 4.8 |
| Average temperature (°C) | -5.8 | -5.3 | -1.2 | 6.9 | 15.9 | 21.9 | 21.5 | 21.7 | 19.1 | 10.5 | 2.4 | 0.7 |
| Average night temperature (°C) | -9.0 | -10.1 | -5.8 | 1.9 | 10.0 | 15.8 | 15.7 | 16.8 | 14.8 | 6.8 | -1.4 | -1.9 |
| Absolute minimum temperature (°C) | -25.0 | -27.2 | -18.0 | -9.4 | -0.9 | 7.5 | 11.2 | 9.9 | 6.3 | -5.7 | -13.7 | -9.0 |
| 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 | 9.0 |
| Daylight mean duration (h) | 9.2 | 10.4 | 11.9 | 13.5 | 14.8 | 15.5 | 15.2 | 14.0 | 12.5 | 11.0 | 9.6 | 8.9 |
| 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) | 3.9 | 6.8 | 6.8 | 8.1 | 10.6 | 12.5 | 12.3 | 11.2 | 8.7 | 7.0 | 6.1 | 4.7 |
| Precipitation (mm) | 50 | 65 | 62 | 117 | 77 | 61 | 109 | 101 | 143 | 90 | 8 | 40 |
| Sunny days | 18 | 16 | 16 | 12 | 19 | 15 | 10 | 18 | 15 | 15 | 21 | 19 |
| Rainy days | 6 | 6 | 8 | 15 | 12 | 15 | 21 | 13 | 15 | 13 | 7 | 9 |
| Snow days | 7 | 6 | 7 | 3 | 0 | 0 | 0 | 0 | 0 | 3 | 2 | 3 |
The best time to visit Rock Falls during the most sunny months:
Months with the longest average daylight duration in Rock Falls:
The largest precipitation sum in Rock Falls is at