Weather & Climate
Ottumwa, Iowa, United States
Overview
Available climate summaries for Ottumwa. Origins and reference periods are unverified; stored values may include AI estimates. Treat these as estimates until independently verified.
Key Metrics
Annual Avg
10.5°C
Summer Avg
23.6°C
Winter Avg
-3.6°C
Record High
43.5°C
Record Low
-35.8°C
Annual Precipitation
944.6 mm
Avg Humidity
76%
Summer Humidity
72%
Winter Humidity
83%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 16.4° | -5° | -35.8° | 28.5 | 84% | 62 | 63 |
| Feb | 22.8° | -3.4° | -24.6° | 38.1 | 81% | 84 | 57.7 |
| Mar | 25.7° | 3.9° | -21.7° | 57 | 77% | 119 | 62.4 |
| Apr | 29.8° | 10.8° | -8.1° | 92.1 | 73% | 145 | 56.7 |
| May | 36.7° | 16.8° | -1.5° | 121.8 | 75% | 174 | 60 |
| Jun | 39.5° | 22.5° | 6.6° | 135.9 | 75% | 187 | 46.1 |
| Jul | 43.5° | 24.9° | 9.6° | 97 | 71% | 197 | 37.4 |
| Aug | 41° | 23.5° | 7.1° | 114.4 | 71% | 171 | 37 |
| Sep | 39.4° | 19.1° | 2° | 89.7 | 71% | 137 | 47.2 |
| Oct | 33.9° | 11.2° | -5.4° | 77.5 | 73% | 96 | 55.3 |
| Nov | 24.8° | 4.2° | -13.5° | 47.7 | 78% | 64 | 58.4 |
| Dec | 22° | -2.3° | -24.6° | 44.9 | 84% | 51 | 65.1 |
Data sources
Estimates and unverified origins
Oyster List climate data - Climate origins are unverified. Available methods include historical APIs and AI estimates; stored rows do not identify the original dataset, reference period, or model for each value. Treat these summaries as estimates until independently verified. Record updated 2026-03-22.