Average annual temperature is 12.2 °C
Absolute maximum temperature: 34.6 °C
Absolute minimum temperature: -15.0 °C
Number of sunny days: 176 days
Number of rainy days: 181 days
Number of snow days: 8 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) | 16.8 | 17.6 | 16.4 | 30.4 | 30.0 | 34.6 | 33.2 | 30.3 | 33.3 | 27.7 | 19.9 | 15.9 |
| Average daytime temperature (°C) | 7.3 | 8.4 | 9.8 | 18.6 | 22.6 | 25.7 | 29.4 | 27.1 | 24.0 | 18.9 | 10.4 | 8.0 |
| Average temperature (°C) | 3.6 | 2.7 | 4.2 | 12.1 | 15.6 | 19.8 | 23.8 | 21.9 | 19.0 | 13.7 | 5.2 | 4.0 |
| Average night temperature (°C) | 0.3 | -1.8 | -0.5 | 6.7 | 8.9 | 14.5 | 18.9 | 17.5 | 15.0 | 9.5 | 0.9 | 0.7 |
| Absolute minimum temperature (°C) | -4.9 | -15.0 | -8.1 | -2.4 | 3.3 | 9.1 | 14.4 | 13.9 | 10.1 | 3.0 | -5.1 | -4.6 |
| 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 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.6 | 10.6 | 11.9 | 13.3 | 14.5 | 15.0 | 14.8 | 13.8 | 12.5 | 11.1 | 9.9 | 9.3 |
| 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) | 4.5 | 6.8 | 7.4 | 8.4 | 11.7 | 10.7 | 11.7 | 10.2 | 8.1 | 7.9 | 7.4 | 4.1 |
| Precipitation (mm) | 122 | 40 | 92 | 114 | 37 | 139 | 106 | 88 | 136 | 73 | 64 | 174 |
| Sunny days | 12 | 16 | 8 | 16 | 21 | 13 | 9 | 10 | 15 | 19 | 21 | 16 |
| Rainy days | 18 | 10 | 20 | 14 | 10 | 17 | 22 | 21 | 15 | 12 | 8 | 14 |
| Snow days | 1 | 2 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
The best time to visit Rockville during the most sunny months:
The largest precipitation sum in Rockville is at