WeatherWX.com
Decatur Monthly Climate Averages
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 33°F Lo 20°F | Hi 36°F Lo 22°F | Hi 48°F Lo 32°F | Hi 59°F Lo 41°F | Hi 71°F Lo 53°F | Hi 79°F Lo 61°F | Hi 82°F Lo 65°F | Hi 80°F Lo 63°F | Hi 75°F Lo 57°F | Hi 63°F Lo 46°F | Hi 49°F Lo 35°F | Hi 39°F Lo 27°F |
| 11 mph | 10 mph | 10 mph | 10 mph | 9 mph | 8 mph | 6 mph | 6 mph | 7 mph | 9 mph | 10 mph | 10 mph |
| 1 in | 1 in | 1.4 in | 1.6 in | 1.8 in | 1.8 in | 1.3 in | 1.3 in | 1 in | 1.2 in | 1.1 in | 1.1 in |
| 83% | 83% | 75% | 75% | 77% | 78% | 80% | 81% | 78% | 73% | 74% | 81% |
| 64% | 61% | 51% | 50% | 43% | 35% | 33% | 33% | 34% | 40% | 44% | 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 |
| 20 | 18 | 23 | 21 | 22 | 22 | 24 | 25 | 25 | 24 | 24 | 22 |
| 7 | 7 | 7 | 8 | 9 | 8 | 7 | 6 | 5 | 7 | 5 | 7 |
| 4 | 4 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 2 | 2 | 3 | 5 | 5 | 6 | 5 | 4 | 2 | 2 | 1 |
| 34 | 33 | 49 | 47 | 58 | 70 | 78 | 76 | 73 | 64 | 60 | 38 |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 0°C Lo -7°C | Hi 2°C Lo -6°C | Hi 9°C Lo 0°C | Hi 15°C Lo 5°C | Hi 22°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 17°C Lo 8°C | Hi 9°C Lo 2°C | Hi 4°C Lo -3°C |
| 17 km/h | 17 km/h | 16 km/h | 16 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 |
| 25 mm | 26 mm | 35 mm | 42 mm | 46 mm | 44 mm | 33 mm | 34 mm | 26 mm | 31 mm | 27 mm | 27 mm |
| 83% | 83% | 75% | 75% | 77% | 78% | 80% | 81% | 78% | 73% | 74% | 81% |
| 64% | 61% | 51% | 50% | 43% | 35% | 33% | 33% | 34% | 40% | 44% | 59% |
| 1019 mb | 1019 mb | 1019 mb | 1015 mb | 1015 mb | 1014 mb | 1015 mb | 1015 mb | 1017 mb | 1017 mb | 1020 mb | 1019 mb |
| 20 | 18 | 23 | 21 | 22 | 22 | 24 | 25 | 25 | 24 | 24 | 22 |
| 7 | 7 | 7 | 8 | 9 | 8 | 7 | 6 | 5 | 7 | 5 | 7 |
| 4 | 4 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 2 | 2 | 3 | 5 | 5 | 6 | 5 | 4 | 2 | 2 | 1 |
| 34 | 33 | 49 | 47 | 58 | 70 | 78 | 76 | 73 | 64 | 60 | 38 |
| 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.