Weather World
St. Charles Monthly Climate Averages
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 28°F Lo 17°F | Hi 31°F Lo 18°F | Hi 43°F Lo 27°F | Hi 54°F Lo 37°F | Hi 67°F Lo 48°F | Hi 76°F Lo 57°F | Hi 81°F Lo 62°F | Hi 79°F Lo 60°F | Hi 73°F Lo 54°F | Hi 60°F Lo 44°F | Hi 46°F Lo 33°F | Hi 35°F Lo 26°F |
| 10 mph | 10 mph | 10 mph | 10 mph | 9 mph | 8 mph | 7 mph | 7 mph | 8 mph | 9 mph | 10 mph | 10 mph |
| 2.1 in | 2.4 in | 3.6 in | 4.4 in | 4 in | 4.3 in | 3.7 in | 3.7 in | 2.9 in | 3.8 in | 2.3 in | 2.4 in |
| 86% | 85% | 77% | 74% | 75% | 77% | 77% | 78% | 76% | 76% | 77% | 83% |
| 70% | 67% | 56% | 53% | 43% | 37% | 32% | 35% | 37% | 48% | 51% | 66% |
| 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 | 30.0 in |
| 18 | 16 | 21 | 19 | 23 | 22 | 23 | 23 | 24 | 23 | 23 | 20 |
| 9 | 8 | 7 | 9 | 8 | 8 | 8 | 8 | 6 | 7 | 6 | 7 |
| 5 | 5 | 4 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 4 |
| 1 | 1 | 1 | 0 | 1 | 0 | 1 | 1 | 2 | 0 | 1 | 1 |
| 1 | 1 | 2 | 3 | 4 | 5 | 5 | 5 | 4 | 2 | 1 | 1 |
| 66 | 75 | 118 | 134 | 182 | 207 | 232 | 225 | 200 | 145 | 138 | 81 |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi -2°C Lo -8°C | Hi -0°C Lo -8°C | Hi 6°C Lo -3°C | Hi 12°C Lo 3°C | Hi 19°C Lo 9°C | Hi 24°C Lo 14°C | Hi 27°C Lo 17°C | Hi 26°C Lo 16°C | Hi 23°C Lo 12°C | Hi 15°C Lo 7°C | Hi 8°C Lo 1°C | Hi 2°C Lo -4°C |
| 16 km/h | 16 km/h | 16 km/h | 16 km/h | 14 km/h | 13 km/h | 11 km/h | 11 km/h | 12 km/h | 15 km/h | 16 km/h | 16 km/h |
| 53 mm | 62 mm | 91 mm | 112 mm | 101 mm | 110 mm | 94 mm | 94 mm | 74 mm | 97 mm | 59 mm | 60 mm |
| 86% | 85% | 77% | 74% | 75% | 77% | 77% | 78% | 76% | 76% | 77% | 83% |
| 70% | 67% | 56% | 53% | 43% | 37% | 32% | 35% | 37% | 48% | 51% | 66% |
| 1018 mb | 1018 mb | 1018 mb | 1015 mb | 1015 mb | 1013 mb | 1014 mb | 1015 mb | 1017 mb | 1016 mb | 1018 mb | 1018 mb |
| 18 | 16 | 21 | 19 | 23 | 22 | 23 | 23 | 24 | 23 | 23 | 20 |
| 9 | 8 | 7 | 9 | 8 | 8 | 8 | 8 | 6 | 7 | 6 | 7 |
| 5 | 5 | 4 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 4 |
| 1 | 1 | 1 | 0 | 1 | 0 | 1 | 1 | 2 | 0 | 1 | 1 |
| 1 | 1 | 2 | 3 | 4 | 5 | 5 | 5 | 4 | 2 | 1 | 1 |
| 66 | 75 | 118 | 134 | 182 | 207 | 232 | 225 | 200 | 145 | 138 | 81 |
| 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.