| Month | Average (°F) | Record (°F) | Average (inches) | ||
|---|---|---|---|---|---|
| High ☀️ | Low 🌙 | High ☀️ | Low 🌙 | Precipitation 💧 | |
| January | 31.4 | 14.4 | 71 | -36 | 1.0 |
| February | 36.2 | 18.7 | 79 | -28 | 1.4 |
| March | 49.6 | 29.5 | 90 | -20 | 2.3 |
| April | 62.2 | 40.1 | 95 | 9 | 3.8 |
| May | 72.1 | 51.6 | 103 | 24 | 5.1 |
| June | 81.6 | 61.7 | 108 | 36 | 5.4 |
| July | 85.2 | 65.2 | 115 | 46 | 3.9 |
| August | 83.4 | 62.7 | 115 | 40 | 4.4 |
| September | 76.6 | 54.0 | 107 | 23 | 3.5 |
| October | 63.6 | 42.2 | 97 | 5 | 2.8 |
| November | 49.1 | 30.2 | 83 | -9 | 2.1 |
| December | 36.5 | 20.3 | 75 | -32 | 1.4 |
| Entire year | 60.8 | 41.1 | 115 | -36 | 36.9 |
|
More Ottumwa Weather Records
1894–2024
|
||
|---|---|---|
| Highest daily low | 92 °F | July 31, 1913 |
| Lowest daily high | -14 °F | February 2, 1996 |
| Greatest daily range (Difference of high and low) |
59 °F | February 27, 2024 |
| Greatest difference in daily high over two conscutive days |
52 °F | Dec 14–15, 2008 |
| Most daily precipitation | 5.3 inches | September 14, 1992 |
| Most monthly precipitation | 13.7 inches | September 1965 |
| Most yearly precipitation | 54.5 inches | 1998 |
| Most yearly days with precipitation | 138 | 1993 |
| Earliest freeze | September 23 | 2012 |
| Earliest day ≥ 80 °F | March 3 | 2024 |
| Earliest day ≥ 90 °F | March 23 | 1910 |
| Earliest day ≥ 100 °F | May 29 | 1934 |
| Latest freeze | May 13 | 1938 |
| Latest day ≥ 80 °F | November 6 | 1909 |
| Latest day ≥ 90 °F | October 29 | 1937 |
| Latest day ≥ 100 °F | September 11 | 1936 |
| Most days in a year < 0 °F | 35 | 1963 |
| Most days in a year < 32 °F | 148 | 2013 |
| Most days in a year ≥ 80 °F | 144 | 1939 |
| Most days in a year ≥ 90 °F | 91 | 1934 |
| Most days in a year ≥ 100 °F | 47 | 1936 |
| Most days in a year ≥ 110 °F | 8 | 1934 |
|
Ottumwa Weather Streaks
Most consecutive days...
|
||
|---|---|---|
| With precipitation | 15 days | May 14–28, 2021 |
| Without precipitation | 62 days | Sep 15 – Nov 15, 1952 |
| High temperature at or below freezing |
47 days | Jan 8 – Feb 23, 1978 |
| High temperature ≥ 80 °F | 89 days | May 27 – Aug 23, 1934 |
| High temperature ≥ 90 °F | 34 days | Jul 17 – Aug 19, 1935 |
| High temperature ≥ 100 °F | 16 days | Jul 4–19, 1936 |
| High temperature ≥ 110 °F | 3 days | Jul 13–15, 1936 |