Weather World
Fairfax Monthly Climate Averages
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 46°F Lo 29°F | Hi 49°F Lo 31°F | Hi 61°F Lo 42°F | Hi 69°F Lo 49°F | Hi 76°F Lo 59°F | Hi 88°F Lo 69°F | Hi 93°F Lo 73°F | Hi 92°F Lo 71°F | Hi 85°F Lo 64°F | Hi 72°F Lo 52°F | Hi 59°F Lo 41°F | Hi 49°F Lo 33°F |
| 10 mph | 11 mph | 12 mph | 12 mph | 10 mph | 10 mph | 9 mph | 9 mph | 9 mph | 11 mph | 11 mph | 10 mph |
| 1.5 in | 1.7 in | 2.8 in | 4.3 in | 6.5 in | 3.9 in | 3.8 in | 3 in | 3.1 in | 4.1 in | 2.9 in | 1.5 in |
| 66% | 66% | 66% | 68% | 77% | 73% | 64% | 62% | 63% | 62% | 66% | 66% |
| 32% | 37% | 38% | 38% | 40% | 26% | 24% | 21% | 25% | 27% | 29% | 31% |
| 30.1 in | 30.1 in | 30.0 in | 29.9 in | 29.9 in | 29.9 in | 29.9 in | 29.9 in | 30.0 in | 30.0 in | 30.1 in | 30.1 in |
| 25 | 22 | 25 | 23 | 21 | 24 | 24 | 25 | 25 | 26 | 26 | 27 |
| 4 | 5 | 5 | 7 | 10 | 6 | 7 | 6 | 5 | 5 | 4 | 3 |
| 2 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 |
| 2 | 2 | 4 | 4 | 5 | 7 | 6 | 7 | 5 | 3 | 2 | 2 |
| 227 | 191 | 204 | 193 | 187 | 255 | 279 | 286 | 260 | 248 | 246 | 237 |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 8°C Lo -2°C | Hi 10°C Lo -0°C | Hi 16°C Lo 6°C | Hi 20°C Lo 9°C | Hi 25°C Lo 15°C | Hi 31°C Lo 21°C | Hi 34°C Lo 23°C | Hi 33°C Lo 22°C | Hi 30°C Lo 18°C | Hi 22°C Lo 11°C | Hi 15°C Lo 5°C | Hi 9°C Lo 0°C |
| 16 km/h | 17 km/h | 19 km/h | 19 km/h | 16 km/h | 16 km/h | 14 km/h | 14 km/h | 15 km/h | 17 km/h | 17 km/h | 16 km/h |
| 37 mm | 42 mm | 71 mm | 110 mm | 166 mm | 99 mm | 96 mm | 76 mm | 79 mm | 103 mm | 75 mm | 39 mm |
| 66% | 66% | 66% | 68% | 77% | 73% | 64% | 62% | 63% | 62% | 66% | 66% |
| 32% | 37% | 38% | 38% | 40% | 26% | 24% | 21% | 25% | 27% | 29% | 31% |
| 1021 mb | 1019 mb | 1016 mb | 1013 mb | 1012 mb | 1012 mb | 1013 mb | 1013 mb | 1015 mb | 1016 mb | 1019 mb | 1020 mb |
| 25 | 22 | 25 | 23 | 21 | 24 | 24 | 25 | 25 | 26 | 26 | 27 |
| 4 | 5 | 5 | 7 | 10 | 6 | 7 | 6 | 5 | 5 | 4 | 3 |
| 2 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 |
| 2 | 2 | 4 | 4 | 5 | 7 | 6 | 7 | 5 | 3 | 2 | 2 |
| 227 | 191 | 204 | 193 | 187 | 255 | 279 | 286 | 260 | 248 | 246 | 237 |
| 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.