Average annual temperature is 12.9 °C
Absolute maximum temperature: 35.1 °C
Absolute minimum temperature: -12.0 °C
Number of sunny days: 187 days
Number of rainy days: 173 days
Number of snow days: 5 days
Look at detailed online map of Rockville
* Weather data for Rockville 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) | 17.5 | 19.4 | 20.2 | 26.3 | 30.5 | 32.8 | 35.1 | 33.9 | 31.6 | 29.0 | 23.7 | 15.6 |
| Average daytime temperature (°C) | 6.1 | 9.9 | 10.8 | 18.4 | 23.9 | 28.2 | 29.4 | 28.2 | 25.9 | 18.9 | 12.2 | 8.4 |
| Average temperature (°C) | 2.3 | 3.7 | 5.0 | 11.4 | 17.7 | 21.9 | 23.9 | 23.0 | 20.3 | 13.9 | 6.7 | 4.3 |
| Average night temperature (°C) | -0.7 | -0.7 | 0.5 | 5.7 | 11.5 | 16.0 | 18.8 | 18.2 | 15.5 | 9.8 | 2.3 | 1.4 |
| Absolute minimum temperature (°C) | -11.6 | -12.0 | -7.8 | -2.9 | 2.5 | 9.5 | 14.9 | 12.6 | 11.0 | -3.3 | -8.7 | -7.4 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.7 | 10.7 | 12.0 | 13.3 | 14.4 | 14.9 | 14.7 | 13.7 | 12.5 | 11.2 | 10.0 | 9.4 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 3.8 | 7.3 | 6.3 | 9.1 | 10.9 | 11.6 | 12.3 | 10.8 | 10.2 | 7.1 | 7.6 | 4.8 |
| Precipitation (mm) | 95 | 90 | 169 | 103 | 37 | 60 | 108 | 126 | 31 | 93 | 30 | 50 |
| Sunny days | 11 | 15 | 13 | 19 | 18 | 19 | 9 | 13 | 17 | 16 | 22 | 15 |
| Rainy days | 17 | 12 | 17 | 11 | 13 | 11 | 22 | 18 | 13 | 15 | 8 | 16 |
| Snow days | 3 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Rockville during the most sunny months:
The largest precipitation sum in Rockville is at