WeatherWorld.comStony Brook Monthly Climate Averages
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 34°F Lo 22°F | Hi 37°F Lo 23°F | Hi 44°F Lo 30°F | Hi 56°F Lo 40°F | Hi 67°F Lo 50°F | Hi 75°F Lo 58°F | Hi 82°F Lo 65°F | Hi 81°F Lo 64°F | Hi 74°F Lo 58°F | Hi 62°F Lo 48°F | Hi 50°F Lo 37°F | Hi 40°F Lo 30°F |
| 9 mph | 9 mph | 9 mph | 8 mph | 7 mph | 6 mph | 6 mph | 6 mph | 6 mph | 7 mph | 8 mph | 8 mph |
| 3.5 in | 3.4 in | 4.1 in | 3.8 in | 2.8 in | 3.8 in | 4.3 in | 3.7 in | 3.2 in | 4.4 in | 3.2 in | 4.5 in |
| 76% | 78% | 73% | 69% | 71% | 74% | 73% | 73% | 75% | 76% | 72% | 76% |
| 46% | 48% | 49% | 48% | 45% | 42% | 39% | 35% | 37% | 43% | 38% | 46% |
| 30.0 in | 30.0 in | 30.0 in | 30.0 in | 30.0 in | 29.9 in | 29.9 in | 30.0 in | 30.0 in | 30.0 in | 30.1 in | 30.0 in |
| 20 | 15 | 21 | 22 | 24 | 22 | 22 | 23 | 24 | 23 | 23 | 21 |
| 7 | 7 | 8 | 8 | 7 | 9 | 9 | 8 | 6 | 8 | 6 | 8 |
| 4 | 5 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
| 1 | 0 | 1 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 1 |
| 1 | 2 | 2 | 3 | 5 | 6 | 6 | 6 | 4 | 3 | 2 | 1 |
| 175 | 148 | 153 | 153 | 186 | 190 | 216 | 231 | 213 | 184 | 199 | 172 |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 1°C Lo -5°C | Hi 3°C Lo -5°C | Hi 7°C Lo -1°C | Hi 13°C Lo 5°C | Hi 20°C Lo 10°C | Hi 24°C Lo 15°C | Hi 28°C Lo 19°C | Hi 27°C Lo 18°C | Hi 23°C Lo 14°C | Hi 16°C Lo 9°C | Hi 10°C Lo 3°C | Hi 5°C Lo -1°C |
| 14 km/h | 14 km/h | 14 km/h | 13 km/h | 11 km/h | 10 km/h | 10 km/h | 9 km/h | 10 km/h | 12 km/h | 13 km/h | 13 km/h |
| 90 mm | 86 mm | 105 mm | 96 mm | 72 mm | 96 mm | 108 mm | 95 mm | 82 mm | 112 mm | 81 mm | 113 mm |
| 76% | 78% | 73% | 69% | 71% | 74% | 73% | 73% | 75% | 76% | 72% | 76% |
| 46% | 48% | 49% | 48% | 45% | 42% | 39% | 35% | 37% | 43% | 38% | 46% |
| 1016 mb | 1016 mb | 1017 mb | 1015 mb | 1016 mb | 1013 mb | 1014 mb | 1015 mb | 1018 mb | 1016 mb | 1019 mb | 1017 mb |
| 20 | 15 | 21 | 22 | 24 | 22 | 22 | 23 | 24 | 23 | 23 | 21 |
| 7 | 7 | 8 | 8 | 7 | 9 | 9 | 8 | 6 | 8 | 6 | 8 |
| 4 | 5 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
| 1 | 0 | 1 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 1 |
| 1 | 2 | 2 | 3 | 5 | 6 | 6 | 6 | 4 | 3 | 2 | 1 |
| 175 | 148 | 153 | 153 | 186 | 190 | 216 | 231 | 213 | 184 | 199 | 172 |
| 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.