Average annual temperature is 24.5 °C
Absolute maximum temperature: 38.1 °C
Absolute minimum temperature: 2.4 °C
Number of sunny days: 119 days
Number of rainy days: 246 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) | 32.2 | 34.3 | 35.1 | 34.9 | 36.8 | 34.8 | 36.5 | 36.1 | 38.1 | 33.1 | 32.6 | 30.1 |
| Average daytime temperature (°C) | 26.9 | 30.5 | 31.0 | 31.2 | 33.4 | 32.1 | 33.8 | 33.0 | 33.0 | 30.2 | 28.0 | 23.8 |
| Average temperature (°C) | 20.2 | 23.1 | 23.8 | 24.7 | 26.2 | 26.5 | 27.9 | 27.9 | 27.1 | 24.9 | 22.8 | 19.4 |
| Average night temperature (°C) | 14.9 | 17.5 | 17.8 | 19.5 | 20.5 | 22.4 | 23.9 | 24.4 | 23.1 | 20.9 | 18.7 | 16.0 |
| Absolute minimum temperature (°C) | 2.4 | 9.2 | 11.5 | 15.0 | 16.9 | 19.9 | 22.8 | 22.5 | 20.6 | 12.6 | 11.0 | 8.8 |
| 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 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 |
| Daylight mean duration (h) | 10.7 | 11.3 | 12.0 | 12.8 | 13.4 | 13.7 | 13.6 | 13.0 | 12.3 | 11.5 | 10.9 | 10.5 |
| Daylight minimum duration (h) | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 | 10.0 |
| Sunshine mean duration (h) | 8.7 | 9.9 | 10.3 | 10.8 | 12.1 | 11.8 | 10.3 | 10.1 | 9.6 | 9.7 | 8.5 | 6.8 |
| Precipitation (mm) | 12 | 15 | 25 | 108 | 92 | 228 | 213 | 215 | 216 | 56 | 270 | 104 |
| Sunny days | 22 | 18 | 17 | 4 | 8 | 0 | 2 | 0 | 1 | 17 | 15 | 15 |
| Rainy days | 9 | 10 | 14 | 26 | 23 | 30 | 29 | 31 | 29 | 14 | 15 | 16 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Rock Island is at