Decatur, IA
Climate overview — based on NOAA 1991-2020 normals from LAMONI MUNI AP, IA US.
Year-round temperatures (°F)
Climate summary
Decatur has an annual average temperature of 51.6°F with about 37.4 inches of precipitation per year. The warmest month is July (average high 85.4°F), and the coldest is January (average low 15.6°F). May is typically the wettest month (5.14 in) and January the driest (1.04 in).
Best time to visit Decatur
Full guide →Climate change signal
All-time records →148 of 366 (40.4%) of Decatur's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1990s | 15 | |
| 2000s | 118 | |
| 2010s | 152 | |
| 2020s | 81 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 33.1°F | 15.6°F | 24.3°F | 1.04 in | — | 6 |
| February | 38.1°F | 19.6°F | 28.8°F | 1.35 in | — | 7 |
| March | 50.8°F | 30.7°F | 40.8°F | 2.20 in | — | 10 |
| April | 62.5°F | 41.4°F | 52.0°F | 4.25 in | — | 11 |
| May | 72.0°F | 52.5°F | 62.3°F | 5.14 in | — | 13 |
| June | 81.5°F | 62.2°F | 71.8°F | 4.81 in | — | 12 |
| July | 85.4°F | 66.2°F | 75.8°F | 4.11 in | — | 9 |
| August | 83.8°F | 63.9°F | 73.9°F | 4.38 in | — | 10 |
| September | 76.5°F | 55.2°F | 65.9°F | 3.71 in | — | 9 |
| October | 64.0°F | 43.3°F | 53.6°F | 2.82 in | — | 9 |
| November | 49.7°F | 31.1°F | 40.4°F | 2.09 in | — | 7 |
| December | 37.7°F | 20.9°F | 29.3°F | 1.48 in | — | 7 |
Climate twins of Decatur
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).