Weather World
Williamstown Monthly Climate Averages
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 34°F Lo 22°F | Hi 38°F Lo 23°F | Hi 48°F Lo 31°F | Hi 59°F Lo 41°F | Hi 69°F Lo 51°F | Hi 78°F Lo 60°F | Hi 84°F Lo 65°F | Hi 81°F Lo 63°F | Hi 74°F Lo 57°F | Hi 62°F Lo 46°F | Hi 50°F Lo 35°F | Hi 40°F Lo 29°F |
| 8 mph | 8 mph | 8 mph | 8 mph | 6 mph | 6 mph | 5 mph | 5 mph | 5 mph | 6 mph | 7 mph | 7 mph |
| 3.4 in | 3.7 in | 4.4 in | 4.9 in | 5.1 in | 4.9 in | 4.7 in | 4.7 in | 5.2 in | 4.6 in | 3.3 in | 4.8 in |
| 78% | 80% | 75% | 75% | 79% | 77% | 77% | 78% | 78% | 79% | 76% | 80% |
| 53% | 54% | 51% | 50% | 50% | 40% | 36% | 38% | 41% | 43% | 42% | 54% |
| 30.1 in | 30.1 in | 30.1 in | 30.0 in | 30.0 in | 29.9 in | 30.0 in | 30.0 in | 30.1 in | 30.0 in | 30.1 in | 30.1 in |
| 18 | 16 | 20 | 22 | 21 | 20 | 22 | 23 | 23 | 24 | 24 | 20 |
| 8 | 8 | 8 | 8 | 10 | 10 | 9 | 8 | 7 | 7 | 5 | 8 |
| 5 | 5 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 |
| 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 2 | 2 | 3 | 5 | 5 | 5 | 5 | 4 | 3 | 1 | 1 |
| 130 | 121 | 141 | 146 | 162 | 201 | 225 | 217 | 194 | 167 | 177 | 130 |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 1°C Lo -6°C | Hi 3°C Lo -5°C | Hi 9°C Lo -0°C | Hi 15°C Lo 5°C | Hi 21°C Lo 11°C | Hi 26°C Lo 15°C | Hi 29°C Lo 18°C | Hi 27°C Lo 17°C | Hi 24°C Lo 14°C | Hi 17°C Lo 8°C | Hi 10°C Lo 2°C | Hi 5°C Lo -2°C |
| 12 km/h | 12 km/h | 13 km/h | 13 km/h | 10 km/h | 9 km/h | 7 km/h | 7 km/h | 8 km/h | 10 km/h | 11 km/h | 11 km/h |
| 85 mm | 94 mm | 113 mm | 123 mm | 129 mm | 124 mm | 119 mm | 119 mm | 132 mm | 116 mm | 85 mm | 121 mm |
| 78% | 80% | 75% | 75% | 79% | 77% | 77% | 78% | 78% | 79% | 76% | 80% |
| 53% | 54% | 51% | 50% | 50% | 40% | 36% | 38% | 41% | 43% | 42% | 54% |
| 1019 mb | 1019 mb | 1018 mb | 1016 mb | 1016 mb | 1014 mb | 1015 mb | 1016 mb | 1018 mb | 1018 mb | 1020 mb | 1020 mb |
| 18 | 16 | 20 | 22 | 21 | 20 | 22 | 23 | 23 | 24 | 24 | 20 |
| 8 | 8 | 8 | 8 | 10 | 10 | 9 | 8 | 7 | 7 | 5 | 8 |
| 5 | 5 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 |
| 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 2 | 2 | 3 | 5 | 5 | 5 | 5 | 4 | 3 | 1 | 1 |
| 130 | 121 | 141 | 146 | 162 | 201 | 225 | 217 | 194 | 167 | 177 | 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.