Weather World
Potomac Monthly Climate Averages
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 33°F Lo 20°F | Hi 37°F Lo 23°F | Hi 51°F Lo 34°F | Hi 61°F Lo 44°F | Hi 72°F Lo 54°F | Hi 80°F Lo 63°F | Hi 82°F Lo 65°F | Hi 82°F Lo 64°F | Hi 77°F Lo 58°F | Hi 64°F Lo 47°F | Hi 50°F Lo 36°F | Hi 39°F Lo 28°F |
| 10 mph | 10 mph | 11 mph | 11 mph | 9 mph | 8 mph | 7 mph | 7 mph | 8 mph | 10 mph | 10 mph | 10 mph |
| 2.6 in | 2.8 in | 4.8 in | 6.5 in | 5.3 in | 5.5 in | 4.8 in | 3.7 in | 3.1 in | 3.9 in | 3.4 in | 3 in |
| 80% | 80% | 75% | 74% | 76% | 78% | 83% | 81% | 74% | 69% | 72% | 79% |
| 59% | 56% | 51% | 49% | 45% | 35% | 35% | 34% | 32% | 38% | 42% | 57% |
| 30.1 in | 30.1 in | 30.1 in | 30.0 in | 30.0 in | 29.9 in | 30.0 in | 30.0 in | 30.0 in | 30.0 in | 30.1 in | 30.1 in |
| 19 | 18 | 21 | 21 | 21 | 21 | 23 | 24 | 25 | 24 | 24 | 21 |
| 8 | 7 | 8 | 8 | 10 | 9 | 8 | 7 | 5 | 7 | 5 | 7 |
| 5 | 3 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 |
| 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 |
| 1 | 2 | 2 | 3 | 5 | 5 | 5 | 5 | 4 | 3 | 2 | 1 |
| 116 | 122 | 148 | 151 | 159 | 199 | 195 | 212 | 224 | 194 | 187 | 130 |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 0°C Lo -7°C | Hi 3°C Lo -5°C | Hi 11°C Lo 1°C | Hi 16°C Lo 7°C | Hi 22°C Lo 12°C | Hi 27°C Lo 17°C | Hi 28°C Lo 19°C | Hi 28°C Lo 18°C | Hi 25°C Lo 14°C | Hi 18°C Lo 8°C | Hi 10°C Lo 2°C | Hi 4°C Lo -3°C |
| 17 km/h | 17 km/h | 17 km/h | 17 km/h | 14 km/h | 13 km/h | 11 km/h | 11 km/h | 12 km/h | 16 km/h | 16 km/h | 16 km/h |
| 66 mm | 70 mm | 123 mm | 166 mm | 134 mm | 138 mm | 121 mm | 93 mm | 80 mm | 99 mm | 86 mm | 77 mm |
| 80% | 80% | 75% | 74% | 76% | 78% | 83% | 81% | 74% | 69% | 72% | 79% |
| 59% | 56% | 51% | 49% | 45% | 35% | 35% | 34% | 32% | 38% | 42% | 57% |
| 1020 mb | 1020 mb | 1018 mb | 1015 mb | 1015 mb | 1014 mb | 1015 mb | 1015 mb | 1017 mb | 1017 mb | 1020 mb | 1019 mb |
| 19 | 18 | 21 | 21 | 21 | 21 | 23 | 24 | 25 | 24 | 24 | 21 |
| 8 | 7 | 8 | 8 | 10 | 9 | 8 | 7 | 5 | 7 | 5 | 7 |
| 5 | 3 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 |
| 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 |
| 1 | 2 | 2 | 3 | 5 | 5 | 5 | 5 | 4 | 3 | 2 | 1 |
| 116 | 122 | 148 | 151 | 159 | 199 | 195 | 212 | 224 | 194 | 187 | 130 |
| 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.