WeatherWX.comManassas Monthly Climate Averages
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 40°F Lo 27°F | Hi 45°F Lo 29°F | Hi 54°F Lo 37°F | Hi 65°F Lo 46°F | Hi 76°F Lo 55°F | Hi 85°F Lo 63°F | Hi 90°F Lo 68°F | Hi 87°F Lo 66°F | Hi 80°F Lo 60°F | Hi 68°F Lo 50°F | Hi 55°F Lo 39°F | Hi 46°F Lo 33°F |
| 7 mph | 7 mph | 7 mph | 7 mph | 6 mph | 5 mph | 5 mph | 5 mph | 5 mph | 6 mph | 6 mph | 6 mph |
| 4 in | 4.4 in | 5 in | 5 in | 6.3 in | 5.1 in | 5.2 in | 5.4 in | 4.8 in | 5.5 in | 4 in | 5.1 in |
| 73% | 75% | 74% | 72% | 75% | 72% | 70% | 72% | 75% | 76% | 74% | 77% |
| 43% | 45% | 45% | 41% | 43% | 32% | 30% | 32% | 36% | 37% | 34% | 43% |
| 30.1 in | 30.1 in | 30.1 in | 30.0 in | 30.0 in | 30.0 in | 30.0 in | 30.0 in | 30.0 in | 30.0 in | 30.1 in | 30.1 in |
| 19 | 15 | 20 | 23 | 22 | 24 | 25 | 25 | 25 | 25 | 25 | 21 |
| 6 | 7 | 8 | 7 | 9 | 6 | 6 | 6 | 5 | 6 | 5 | 6 |
| 7 | 6 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
| 4 | 4 | 4 | 3 | 6 | 5 | 4 | 4 | 6 | 5 | 3 | 4 |
| 2 | 2 | 3 | 4 | 6 | 7 | 6 | 6 | 5 | 3 | 2 | 2 |
| 273 | 243 | 273 | 278 | 288 | 324 | 346 | 339 | 298 | 295 | 295 | 280 |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 5°C Lo -3°C | Hi 7°C Lo -2°C | Hi 12°C Lo 3°C | Hi 19°C Lo 8°C | Hi 24°C Lo 13°C | Hi 29°C Lo 17°C | Hi 32°C Lo 20°C | Hi 31°C Lo 19°C | Hi 27°C Lo 16°C | Hi 20°C Lo 10°C | Hi 13°C Lo 4°C | Hi 8°C Lo 1°C |
| 11 km/h | 11 km/h | 11 km/h | 11 km/h | 10 km/h | 9 km/h | 8 km/h | 7 km/h | 8 km/h | 10 km/h | 10 km/h | 10 km/h |
| 101 mm | 112 mm | 126 mm | 127 mm | 160 mm | 129 mm | 132 mm | 136 mm | 121 mm | 139 mm | 100 mm | 130 mm |
| 73% | 75% | 74% | 72% | 75% | 72% | 70% | 72% | 75% | 76% | 74% | 77% |
| 43% | 45% | 45% | 41% | 43% | 32% | 30% | 32% | 36% | 37% | 34% | 43% |
| 1020 mb | 1019 mb | 1019 mb | 1016 mb | 1017 mb | 1014 mb | 1015 mb | 1016 mb | 1018 mb | 1017 mb | 1021 mb | 1020 mb |
| 19 | 15 | 20 | 23 | 22 | 24 | 25 | 25 | 25 | 25 | 25 | 21 |
| 6 | 7 | 8 | 7 | 9 | 6 | 6 | 6 | 5 | 6 | 5 | 6 |
| 7 | 6 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
| 4 | 4 | 4 | 3 | 6 | 5 | 4 | 4 | 6 | 5 | 3 | 4 |
| 2 | 2 | 3 | 4 | 6 | 7 | 6 | 6 | 5 | 3 | 2 | 2 |
| 273 | 243 | 273 | 278 | 288 | 324 | 346 | 339 | 298 | 295 | 295 | 280 |
| Month |
| Avg. Temperatures |
| Avg. Wind Speed |
| Avg. Precipitation |
| Average Humidity |
| Avg. Cloud Cover |
| Pressure Average |
| Average Dry Days |
| Avg. Precip. Days |
| Avg. Snow Days |
| Average Fog Days |
| Average UV Index |
| Avg. Hours of Sun |
Averages are based on historical weather data from the past 10 years.
