Weather World
Boone County, IL Official Website
Boone County Monthly Climate Averages
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 27°F Lo 14°F | Hi 32°F Lo 17°F | Hi 45°F Lo 30°F | Hi 56°F Lo 39°F | Hi 68°F Lo 50°F | Hi 78°F Lo 60°F | Hi 81°F Lo 64°F | Hi 80°F Lo 62°F | Hi 74°F Lo 55°F | Hi 61°F Lo 44°F | Hi 46°F Lo 32°F | Hi 34°F Lo 23°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 |
| 2.2 in | 2 in | 3.6 in | 5.1 in | 6.1 in | 6.5 in | 4.5 in | 4.1 in | 3.4 in | 4 in | 2.9 in | 2.6 in |
| 85% | 84% | 77% | 75% | 77% | 80% | 83% | 82% | 77% | 73% | 75% | 81% |
| 62% | 59% | 53% | 52% | 46% | 38% | 36% | 34% | 34% | 43% | 46% | 59% |
| 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 |
| 19 | 17 | 21 | 21 | 21 | 20 | 23 | 24 | 24 | 24 | 23 | 21 |
| 7 | 6 | 7 | 8 | 10 | 10 | 8 | 7 | 6 | 7 | 5 | 7 |
| 5 | 5 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 |
| 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 2 | 0 | 1 | 1 |
| 1 | 1 | 2 | 3 | 5 | 5 | 5 | 5 | 4 | 2 | 1 | 1 |
| 109 | 113 | 143 | 132 | 166 | 199 | 208 | 221 | 219 | 172 | 170 | 119 |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi -3°C Lo -10°C | Hi -0°C Lo -8°C | Hi 7°C Lo -1°C | Hi 13°C Lo 4°C | Hi 20°C Lo 10°C | Hi 25°C Lo 15°C | Hi 27°C Lo 18°C | Hi 26°C Lo 16°C | Hi 24°C Lo 13°C | Hi 16°C Lo 7°C | Hi 8°C Lo 0°C | Hi 1°C Lo -5°C |
| 16 km/h | 16 km/h | 16 km/h | 17 km/h | 14 km/h | 13 km/h | 11 km/h | 11 km/h | 12 km/h | 15 km/h | 16 km/h | 15 km/h |
| 56 mm | 51 mm | 92 mm | 128 mm | 154 mm | 166 mm | 115 mm | 105 mm | 85 mm | 101 mm | 73 mm | 66 mm |
| 85% | 84% | 77% | 75% | 77% | 80% | 83% | 82% | 77% | 73% | 75% | 81% |
| 62% | 59% | 53% | 52% | 46% | 38% | 36% | 34% | 34% | 43% | 46% | 59% |
| 1020 mb | 1020 mb | 1018 mb | 1014 mb | 1015 mb | 1013 mb | 1015 mb | 1015 mb | 1017 mb | 1016 mb | 1019 mb | 1019 mb |
| 19 | 17 | 21 | 21 | 21 | 20 | 23 | 24 | 24 | 24 | 23 | 21 |
| 7 | 6 | 7 | 8 | 10 | 10 | 8 | 7 | 6 | 7 | 5 | 7 |
| 5 | 5 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 |
| 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 2 | 0 | 1 | 1 |
| 1 | 1 | 2 | 3 | 5 | 5 | 5 | 5 | 4 | 2 | 1 | 1 |
| 109 | 113 | 143 | 132 | 166 | 199 | 208 | 221 | 219 | 172 | 170 | 119 |
| 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.