Weather WorldFairfax Monthly Climate Averages
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 27°F Lo 13°F | Hi 32°F Lo 16°F | Hi 47°F Lo 31°F | Hi 58°F Lo 41°F | Hi 69°F Lo 52°F | Hi 79°F Lo 62°F | Hi 82°F Lo 65°F | Hi 82°F Lo 63°F | Hi 76°F Lo 56°F | Hi 61°F Lo 45°F | Hi 47°F Lo 32°F | Hi 35°F Lo 23°F |
| 10 mph | 11 mph | 11 mph | 11 mph | 9 mph | 8 mph | 7 mph | 7 mph | 8 mph | 10 mph | 10 mph | 10 mph |
| 1.6 in | 1.5 in | 2.7 in | 4.9 in | 5.8 in | 6.2 in | 3.7 in | 4 in | 3.9 in | 4.1 in | 2.3 in | 2.2 in |
| 85% | 83% | 76% | 74% | 79% | 81% | 82% | 78% | 73% | 70% | 73% | 79% |
| 58% | 54% | 50% | 48% | 44% | 36% | 33% | 30% | 29% | 38% | 39% | 52% |
| 30.1 in | 30.1 in | 30.1 in | 29.9 in | 29.9 in | 29.9 in | 30.0 in | 30.0 in | 30.0 in | 30.0 in | 30.1 in | 30.1 in |
| 18 | 18 | 22 | 20 | 21 | 22 | 25 | 25 | 24 | 25 | 24 | 21 |
| 7 | 6 | 6 | 9 | 10 | 8 | 6 | 6 | 6 | 6 | 5 | 7 |
| 5 | 4 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 4 |
| 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 1 |
| 1 | 2 | 2 | 3 | 5 | 5 | 6 | 5 | 4 | 2 | 2 | 1 |
| 117 | 122 | 151 | 148 | 175 | 208 | 230 | 240 | 238 | 201 | 199 | 150 |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi -3°C Lo -10°C | Hi -0°C Lo -9°C | Hi 8°C Lo -1°C | Hi 14°C Lo 5°C | Hi 21°C Lo 11°C | Hi 26°C Lo 17°C | Hi 28°C Lo 18°C | Hi 28°C Lo 17°C | Hi 25°C Lo 13°C | Hi 16°C Lo 7°C | Hi 9°C Lo 0°C | Hi 2°C Lo -5°C |
| 17 km/h | 17 km/h | 17 km/h | 18 km/h | 15 km/h | 13 km/h | 11 km/h | 12 km/h | 14 km/h | 16 km/h | 17 km/h | 16 km/h |
| 40 mm | 39 mm | 68 mm | 124 mm | 147 mm | 158 mm | 95 mm | 101 mm | 98 mm | 103 mm | 58 mm | 56 mm |
| 85% | 83% | 76% | 74% | 79% | 81% | 82% | 78% | 73% | 70% | 73% | 79% |
| 58% | 54% | 50% | 48% | 44% | 36% | 33% | 30% | 29% | 38% | 39% | 52% |
| 1020 mb | 1020 mb | 1018 mb | 1014 mb | 1014 mb | 1012 mb | 1014 mb | 1015 mb | 1016 mb | 1016 mb | 1019 mb | 1019 mb |
| 18 | 18 | 22 | 20 | 21 | 22 | 25 | 25 | 24 | 25 | 24 | 21 |
| 7 | 6 | 6 | 9 | 10 | 8 | 6 | 6 | 6 | 6 | 5 | 7 |
| 5 | 4 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 4 |
| 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 1 |
| 1 | 2 | 2 | 3 | 5 | 5 | 6 | 5 | 4 | 2 | 2 | 1 |
| 117 | 122 | 151 | 148 | 175 | 208 | 230 | 240 | 238 | 201 | 199 | 150 |
| 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.