Weather World
Grand Lake St Marys 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 49°F Lo 33°F | Hi 60°F Lo 42°F | Hi 70°F Lo 53°F | Hi 79°F Lo 61°F | Hi 82°F Lo 65°F | Hi 80°F Lo 62°F | Hi 76°F Lo 57°F | Hi 64°F Lo 46°F | Hi 49°F Lo 35°F | Hi 39°F Lo 28°F |
| 11 mph | 11 mph | 10 mph | 10 mph | 9 mph | 8 mph | 6 mph | 6 mph | 7 mph | 9 mph | 10 mph | 10 mph |
| 3.1 in | 3.2 in | 4.7 in | 5.9 in | 5.6 in | 5.6 in | 4.6 in | 3.6 in | 3.2 in | 3.4 in | 3.3 in | 3.9 in |
| 82% | 82% | 75% | 76% | 78% | 78% | 81% | 81% | 77% | 73% | 74% | 81% |
| 65% | 62% | 52% | 51% | 45% | 38% | 36% | 35% | 35% | 41% | 46% | 62% |
| 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 |
| 17 | 17 | 21 | 20 | 21 | 20 | 22 | 23 | 23 | 24 | 24 | 21 |
| 9 | 8 | 8 | 9 | 10 | 10 | 9 | 8 | 7 | 7 | 5 | 8 |
| 5 | 4 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
| 1 | 1 | 0 | 0 | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 1 |
| 1 | 2 | 2 | 3 | 5 | 5 | 5 | 5 | 4 | 2 | 2 | 1 |
| 96 | 97 | 141 | 141 | 165 | 195 | 212 | 216 | 212 | 176 | 169 | 105 |
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 10°C Lo 0°C | Hi 15°C Lo 5°C | Hi 21°C Lo 12°C | Hi 26°C Lo 16°C | Hi 28°C Lo 18°C | Hi 27°C Lo 17°C | Hi 24°C Lo 14°C | Hi 18°C Lo 8°C | Hi 10°C Lo 2°C | Hi 4°C Lo -2°C |
| 17 km/h | 17 km/h | 17 km/h | 17 km/h | 14 km/h | 12 km/h | 10 km/h | 10 km/h | 12 km/h | 15 km/h | 16 km/h | 16 km/h |
| 79 mm | 82 mm | 120 mm | 149 mm | 142 mm | 141 mm | 117 mm | 92 mm | 82 mm | 87 mm | 85 mm | 100 mm |
| 82% | 82% | 75% | 76% | 78% | 78% | 81% | 81% | 77% | 73% | 74% | 81% |
| 65% | 62% | 52% | 51% | 45% | 38% | 36% | 35% | 35% | 41% | 46% | 62% |
| 1020 mb | 1019 mb | 1018 mb | 1015 mb | 1015 mb | 1014 mb | 1015 mb | 1016 mb | 1017 mb | 1017 mb | 1020 mb | 1019 mb |
| 17 | 17 | 21 | 20 | 21 | 20 | 22 | 23 | 23 | 24 | 24 | 21 |
| 9 | 8 | 8 | 9 | 10 | 10 | 9 | 8 | 7 | 7 | 5 | 8 |
| 5 | 4 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
| 1 | 1 | 0 | 0 | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 1 |
| 1 | 2 | 2 | 3 | 5 | 5 | 5 | 5 | 4 | 2 | 2 | 1 |
| 96 | 97 | 141 | 141 | 165 | 195 | 212 | 216 | 212 | 176 | 169 | 105 |
| 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.