Ottumwa, IA Weather & Climate Normals
What a normal year in Ottumwa actually looks like
On the 30-year record NOAA keeps for Ottumwa, IA, the comfort score comes out to 40/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 4 months a year land in the 55–75°F range this site treats as mild.
How much Ottumwa's weather actually swings
Average temperatures in Ottumwa run from 23°F in Jan up to 75°F in Jul, a 52.2°F seasonal swing, one of the widest gaps in this dataset.
Ottumwa, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 32°F | 14°F | 1.01in | 7.1in |
| Feb | 37°F | 18°F | 1.41in | 5.8in |
| Mar | 50°F | 29°F | 2.24in | 3in |
| Apr | 63°F | 39°F | 3.75in | 1.4in |
| May | 73°F | 51°F | 5.03in | 0in |
| Jun | 82°F | 61°F | 5.38in | 0in |
| Jul | 86°F | 65°F | 3.87in | 0in |
| Aug | 84°F | 62°F | 4.44in | 0in |
| Sep | 77°F | 53°F | 3.5in | 0in |
| Oct | 64°F | 42°F | 2.81in | 0.5in |
| Nov | 50°F | 30°F | 2.09in | 1.6in |
| Dec | 37°F | 20°F | 1.44in | 4.2in |
If you're timing a visit, May, Jun, Aug, and Sep are Ottumwa's mildest stretch; if you're moving there, you should plan around Jul's heat and Jan's cold instead.
How wet Ottumwa actually gets
Over a typical year, Ottumwa sees about 36.97in of precipitation a year across roughly 109 days with measurable rain or snow, with 23.6in of snow a year.
Ottumwa against the rest of the country
Out of 4876 cities scored here, Ottumwa comes in at 4510; within IA alone it ranks 69 of 85. Population is about 25,648.
Checking the actual forecast
These figures come from Ottumwa Industrial Ap, IA US, the NOAA station 6.0 miles from Ottumwa, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is