Average annual temperature is 12.5 °C
Absolute maximum temperature: 40.8 °C
Absolute minimum temperature: -10.7 °C
Number of sunny days: 244 days
Number of rainy days: 103 days
Number of snow days: 18 days
Look at detailed online map of Rock Island
* Weather data for Rock Island 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) | 8.7 | 12.3 | 14.6 | 29.2 | 35.3 | 34.7 | 36.9 | 40.8 | 32.6 | 25.9 | 12.9 | 9.2 |
| Average daytime temperature (°C) | 3.4 | 6.0 | 10.2 | 14.9 | 27.4 | 28.7 | 33.5 | 33.0 | 25.7 | 17.8 | 7.6 | 4.9 |
| Average temperature (°C) | 0.8 | 1.5 | 4.8 | 9.5 | 20.2 | 21.7 | 26.1 | 25.9 | 19.3 | 12.6 | 4.3 | 2.2 |
| Average night temperature (°C) | -1.5 | -1.5 | 1.0 | 5.0 | 14.0 | 15.5 | 18.8 | 19.6 | 14.1 | 8.3 | 1.8 | 0.3 |
| Absolute minimum temperature (°C) | -9.0 | -10.7 | -3.1 | -0.4 | 8.7 | 9.1 | 14.1 | 14.1 | 7.3 | -1.9 | -3.1 | -4.0 |
| 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 | 8.0 |
| Daylight mean duration (h) | 9.0 | 10.3 | 11.9 | 13.6 | 15.1 | 15.9 | 15.5 | 14.2 | 12.6 | 10.9 | 9.4 | 8.5 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 8.0 | 8.0 |
| Sunshine mean duration (h) | 4.5 | 6.2 | 7.9 | 9.3 | 13.0 | 13.4 | 13.7 | 11.7 | 9.9 | 8.1 | 4.7 | 2.7 |
| Precipitation (mm) | 42 | 14 | 41 | 43 | 3 | 9 | 5 | 7 | 11 | 14 | 43 | 79 |
| Sunny days | 14 | 21 | 13 | 17 | 22 | 27 | 29 | 24 | 23 | 23 | 20 | 11 |
| Rainy days | 10 | 5 | 15 | 12 | 9 | 3 | 2 | 7 | 7 | 8 | 10 | 15 |
| Snow days | 7 | 2 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5 |
The best time to visit Rock Island during the most sunny months:
Months with the longest average daylight duration in Rock Island:
The largest precipitation sum in Rock Island is at