Weather World
Northumberland, PA Official Website
Northumberland County Monthly Climate Averages
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 34°F Lo 20°F | Hi 38°F Lo 22°F | Hi 47°F Lo 30°F | Hi 59°F Lo 39°F | Hi 70°F Lo 50°F | Hi 78°F Lo 58°F | Hi 84°F Lo 63°F | Hi 81°F Lo 61°F | Hi 75°F Lo 55°F | Hi 62°F Lo 45°F | Hi 49°F Lo 34°F | Hi 39°F Lo 27°F |
| 7 mph | 7 mph | 8 mph | 8 mph | 6 mph | 6 mph | 5 mph | 5 mph | 5 mph | 6 mph | 7 mph | 7 mph |
| 3.2 in | 3.5 in | 3.8 in | 5 in | 5 in | 4.5 in | 4.7 in | 4.5 in | 5.2 in | 4.3 in | 3.1 in | 4.6 in |
| 78% | 80% | 76% | 75% | 79% | 78% | 77% | 78% | 79% | 79% | 77% | 80% |
| 56% | 56% | 52% | 51% | 49% | 41% | 37% | 38% | 40% | 44% | 44% | 56% |
| 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 | 30.1 in | 30.1 in | 30.1 in |
| 18 | 15 | 20 | 22 | 22 | 21 | 22 | 24 | 23 | 25 | 23 | 19 |
| 8 | 8 | 8 | 8 | 9 | 9 | 9 | 7 | 7 | 6 | 5 | 8 |
| 5 | 5 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 4 |
| 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 |
| 1 | 1 | 2 | 3 | 5 | 5 | 5 | 5 | 4 | 2 | 2 | 1 |
| 115 | 110 | 135 | 139 | 158 | 191 | 218 | 213 | 197 | 160 | 170 | 115 |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 1°C Lo -7°C | Hi 3°C Lo -6°C | Hi 9°C Lo -1°C | Hi 15°C Lo 4°C | Hi 21°C Lo 10°C | Hi 26°C Lo 14°C | Hi 29°C Lo 17°C | Hi 27°C Lo 16°C | Hi 24°C Lo 13°C | Hi 17°C Lo 7°C | Hi 9°C Lo 1°C | Hi 4°C Lo -3°C |
| 12 km/h | 12 km/h | 12 km/h | 12 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 |
| 81 mm | 89 mm | 96 mm | 127 mm | 126 mm | 114 mm | 119 mm | 115 mm | 132 mm | 108 mm | 80 mm | 117 mm |
| 78% | 80% | 76% | 75% | 79% | 78% | 77% | 78% | 79% | 79% | 77% | 80% |
| 56% | 56% | 52% | 51% | 49% | 41% | 37% | 38% | 40% | 44% | 44% | 56% |
| 1019 mb | 1018 mb | 1018 mb | 1016 mb | 1016 mb | 1014 mb | 1015 mb | 1016 mb | 1018 mb | 1018 mb | 1020 mb | 1019 mb |
| 18 | 15 | 20 | 22 | 22 | 21 | 22 | 24 | 23 | 25 | 23 | 19 |
| 8 | 8 | 8 | 8 | 9 | 9 | 9 | 7 | 7 | 6 | 5 | 8 |
| 5 | 5 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 4 |
| 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 |
| 1 | 1 | 2 | 3 | 5 | 5 | 5 | 5 | 4 | 2 | 2 | 1 |
| 115 | 110 | 135 | 139 | 158 | 191 | 218 | 213 | 197 | 160 | 170 | 115 |
| 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.