Weather World
St. Charles Monthly Climate Averages
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 28°F Lo 11°F | Hi 30°F Lo 13°F | Hi 38°F Lo 21°F | Hi 47°F Lo 28°F | Hi 59°F Lo 36°F | Hi 72°F Lo 46°F | Hi 83°F Lo 55°F | Hi 81°F Lo 54°F | Hi 72°F Lo 47°F | Hi 54°F Lo 33°F | Hi 40°F Lo 22°F | Hi 28°F Lo 13°F |
| 4 mph | 4 mph | 5 mph | 6 mph | 6 mph | 6 mph | 5 mph | 5 mph | 5 mph | 5 mph | 4 mph | 4 mph |
| 1.7 in | 2.3 in | 2.2 in | 2.4 in | 2.4 in | 1.2 in | 0.9 in | 1.5 in | 1.7 in | 2 in | 1.8 in | 2.7 in |
| 91% | 91% | 85% | 72% | 63% | 52% | 42% | 42% | 46% | 61% | 76% | 88% |
| 59% | 63% | 51% | 40% | 34% | 20% | 16% | 19% | 20% | 29% | 41% | 59% |
| 30.3 in | 30.2 in | 30.1 in | 30.0 in | 29.9 in | 29.9 in | 29.9 in | 29.9 in | 30.0 in | 30.1 in | 30.2 in | 30.3 in |
| 15 | 13 | 15 | 15 | 20 | 24 | 24 | 24 | 24 | 24 | 17 | 13 |
| 10 | 10 | 8 | 9 | 9 | 6 | 7 | 7 | 6 | 5 | 7 | 11 |
| 7 | 7 | 8 | 6 | 2 | 0 | 0 | 0 | 0 | 2 | 5 | 7 |
| 2 | 2 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 2 |
| 1 | 1 | 2 | 2 | 4 | 4 | 5 | 5 | 3 | 2 | 1 | 1 |
| 110 | 80 | 140 | 183 | 222 | 286 | 314 | 299 | 280 | 238 | 182 | 113 |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi -3°C Lo -12°C | Hi -1°C Lo -10°C | Hi 3°C Lo -6°C | Hi 8°C Lo -2°C | Hi 15°C Lo 2°C | Hi 22°C Lo 8°C | Hi 28°C Lo 13°C | Hi 27°C Lo 12°C | Hi 22°C Lo 8°C | Hi 12°C Lo 1°C | Hi 4°C Lo -6°C | Hi -2°C Lo -11°C |
| 6 km/h | 7 km/h | 8 km/h | 9 km/h | 9 km/h | 9 km/h | 8 km/h | 8 km/h | 8 km/h | 8 km/h | 7 km/h | 7 km/h |
| 42 mm | 59 mm | 56 mm | 61 mm | 60 mm | 30 mm | 23 mm | 39 mm | 42 mm | 51 mm | 45 mm | 68 mm |
| 91% | 91% | 85% | 72% | 63% | 52% | 42% | 42% | 46% | 61% | 76% | 88% |
| 59% | 63% | 51% | 40% | 34% | 20% | 16% | 19% | 20% | 29% | 41% | 59% |
| 1027 mb | 1022 mb | 1018 mb | 1015 mb | 1013 mb | 1012 mb | 1014 mb | 1014 mb | 1015 mb | 1018 mb | 1022 mb | 1025 mb |
| 15 | 13 | 15 | 15 | 20 | 24 | 24 | 24 | 24 | 24 | 17 | 13 |
| 10 | 10 | 8 | 9 | 9 | 6 | 7 | 7 | 6 | 5 | 7 | 11 |
| 7 | 7 | 8 | 6 | 2 | 0 | 0 | 0 | 0 | 2 | 5 | 7 |
| 2 | 2 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 2 |
| 1 | 1 | 2 | 2 | 4 | 4 | 5 | 5 | 3 | 2 | 1 | 1 |
| 110 | 80 | 140 | 183 | 222 | 286 | 314 | 299 | 280 | 238 | 182 | 113 |
| 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.