Ottumwa Ind AP Weather Records (USW00014950)
Record envelope, standing records and threshold days for Ottumwa Ind AP (USW00014950), Iowa, United States, with 79 years of record.
Key Facts for Ottumwa Ind AP
- Ottumwa Ind AP (USW00014950) is a weather station in Iowa, United States at 41.10 latitude and -92.44 longitude, 254 m (834 ft) above sea level.
- The station reports from 1948 to 2026, 79 years of record.
- 1,464 records set at Ottumwa Ind AP still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Ottumwa Ind AP set a daily record precipitation of 34.3 mm (1.4 in) on 30 September 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Iowa, United States, 41.10 latitude, -92.44 longitude.
- Elevation: 254 m (834 ft).
- Period of record: 1948 to 2026, 79 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
10 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 21.7 C (71.1 F) | -30.6 C (-23.1 F) | 16.1 C (61.0 F) | -24.4 C (-11.9 F) |
| Feb | 26.1 C (79.0 F) | -32.8 C (-27.0 F) | 21.1 C (70.0 F) | -15.6 C (3.9 F) |
| Mar | 32.8 C (91.0 F) | -28.9 C (-20.0 F) | 32.8 C (91.0 F) | -15.6 C (3.9 F) |
| Apr | 32.8 C (91.0 F) | -12.8 C (9.0 F) | 30.0 C (86.0 F) | -0.6 C (30.9 F) |
| May | 36.1 C (97.0 F) | -4.4 C (24.1 F) | 30.6 C (87.1 F) | 1.1 C (34.0 F) |
| Jun | 39.4 C (102.9 F) | 5.0 C (41.0 F) | 32.8 C (91.0 F) | 10.0 C (50.0 F) |
| Jul | 41.1 C (106.0 F) | 8.9 C (48.0 F) | 36.1 C (97.0 F) | 12.2 C (54.0 F) |
| Aug | 40.6 C (105.1 F) | 5.0 C (41.0 F) | 33.3 C (91.9 F) | 13.3 C (55.9 F) |
| Sep | 37.8 C (100.0 F) | -2.8 C (27.0 F) | 35.6 C (96.1 F) | 10.6 C (51.1 F) |
| Oct | 33.9 C (93.0 F) | -8.3 C (17.1 F) | 27.2 C (81.0 F) | 6.1 C (43.0 F) |
| Nov | 26.1 C (79.0 F) | -22.8 C (-9.0 F) | n/a | n/a |
| Dec | 23.9 C (75.0 F) | -29.4 C (-20.9 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1948 | 16 |
| 1949 | 10 |
| 1950 | 34 |
| 1951 | 29 |
| 1952 | 16 |
| 1953 | 27 |
| 1954 | 24 |
| 1955 | 19 |
| 1956 | 17 |
| 1957 | 11 |
| 1958 | 18 |
| 1959 | 23 |
| 1960 | 29 |
| 1961 | 10 |
| 1962 | 27 |
| 1963 | 26 |
| 1964 | 19 |
| 1965 | 26 |
| 1966 | 22 |
| 1967 | 20 |
| 1968 | 12 |
| 1969 | 11 |
| 1970 | 19 |
| 1971 | 13 |
| 1972 | 25 |
| 1973 | 11 |
| 1974 | 16 |
| 1975 | 13 |
| 1976 | 13 |
| 1977 | 18 |
| 1978 | 13 |
| 1979 | 9 |
| 1980 | 17 |
| 1981 | 16 |
| 1982 | 13 |
| 1983 | 43 |
| 1984 | 22 |
| 1985 | 19 |
| 1986 | 16 |
| 1987 | 18 |
| 1988 | 28 |
| 1989 | 26 |
| 1990 | 19 |
| 1991 | 30 |
| 1992 | 19 |
| 1993 | 14 |
| 1994 | 10 |
| 1995 | 10 |
| 1996 | 16 |
| 1997 | 10 |
| 1998 | 22 |
| 1999 | 17 |
| 2000 | 21 |
| 2001 | 15 |
| 2002 | 18 |
| 2003 | 11 |
| 2004 | 23 |
| 2005 | 15 |
| 2006 | 17 |
| 2007 | 13 |
| 2008 | 11 |
| 2009 | 21 |
| 2010 | 7 |
| 2011 | 12 |
| 2012 | 38 |
| 2013 | 16 |
| 2014 | 23 |
| 2015 | 13 |
| 2016 | 15 |
| 2017 | 27 |
| 2018 | 25 |
| 2019 | 15 |
| 2020 | 21 |
| 2021 | 21 |
| 2022 | 20 |
| 2023 | 19 |
| 2024 | 16 |
| 2025 | 12 |
| 2026 | 18 |
All-Time Record Progression
11 new records| Date | Kind | Detail |
|---|---|---|
| 1978-02-13 | Record daily snowfall | Record daily snowfall 38.1 cm (15.0 in) |
| 1982-01-10 | Record low minimum temperature | Record low minimum temperature -30.6 C (-23.1 F) |
| 1983-08-17 | Record high minimum temperature | Record high minimum temperature 28.9 C (84.0 F) |
| 1983-12-23 | Record low maximum temperature | Record low maximum temperature -22.2 C (-8.0 F) |
| 1983-12-24 | Record low maximum temperature | Record low maximum temperature -23.3 C (-9.9 F) |
| 1989-07-12 | Record daily precipitation | Record daily precipitation 96.0 mm (3.8 in) |
| 1992-09-14 | Record daily precipitation | Record daily precipitation 135.1 mm (5.3 in) |
| 1996-02-02 | Record low maximum temperature | Record low maximum temperature -25.6 C (-14.1 F) |
| 1996-02-02 | Record low minimum temperature | Record low minimum temperature -32.2 C (-26.0 F) |
| 1996-02-03 | Record low minimum temperature | Record low minimum temperature -32.8 C (-27.0 F) |
| 2012-07-23 | Record high maximum temperature | Record high maximum temperature 41.1 C (106.0 F) |
Wettest Day of Each Month
Sep: 135.1 mm (5.3 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 39.1 mm (1.5 in) | 27 January 1949 |
| Feb | 49.0 mm (1.9 in) | 24 February 2007 |
| Mar | 70.9 mm (2.8 in) | 4 March 1976 |
| Apr | 124.0 mm (4.9 in) | 17 April 2013 |
| May | 112.5 mm (4.4 in) | 2 May 1993 |
| Jun | 86.6 mm (3.4 in) | 25 June 2008 |
| Jul | 96.0 mm (3.8 in) | 12 July 1989 |
| Aug | 115.3 mm (4.5 in) | 20 August 2010 |
| Sep | 135.1 mm (5.3 in) | 14 September 1992 |
| Oct | 61.0 mm (2.4 in) | 24 October 2021 |
| Nov | 65.5 mm (2.6 in) | 2 November 1961 |
| Dec | 48.3 mm (1.9 in) | 7 December 1980 |
Period of Record Coverage
1948 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1948 | 364 | 99% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 364 | 100% | Yes |
| 1951 | 364 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 365 | 100% | Yes |
| 1956 | 365 | 100% | Yes |
| 1957 | 363 | 99% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 364 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 364 | 100% | Yes |
| 1979 | 364 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 362 | 99% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 335 | 92% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 365 | 100% | Yes |
| 1989 | 365 | 100% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 365 | 100% | Yes |
| 1994 | 365 | 100% | Yes |
| 1995 | 365 | 100% | Yes |
| 1996 | 365 | 100% | Yes |
| 1997 | 365 | 100% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 304 | 83% | No |
| 2001 | 334 | 92% | Yes |
| 2002 | 364 | 100% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 365 | 100% | Yes |
| 2008 | 364 | 99% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 366 | 100% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 364 | 99% | Yes |
| 2017 | 365 | 100% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 364 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 281 | 77% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 30 September 2026 | Ottumwa Ind AP, US | daily rain (Provisional) | 34.3 mm (1.4 in) | 8.6 mm (0.34 in) | 64 years | 32 of 100 (Routine) |
| 4 September 2026 | Ottumwa Ind AP, US | daily high min (Provisional) | 22.8 C (73.0 F) | 0.6 C (1.1 F) | 65 years | 27 of 100 (Routine) |
| 3 September 2026 | Ottumwa Ind AP, US | daily high min (Provisional) | 23.9 C (75.0 F) | 1.7 C (3.1 F) | 65 years | 29 of 100 (Routine) |
| 3 September 2026 | Ottumwa Ind AP, US | daily high max (Provisional) | 35.6 C (96.1 F) | 0.6 C (1.1 F) | 65 years | 27 of 100 (Routine) |
| 27 July 2026 | Ottumwa Ind AP, US | daily high min (Tie) | 25.6 C (78.1 F) | tie | 71 years | 7 of 100 (Routine) |
| 30 June 2026 | Ottumwa Ind AP, US | daily high min | 24.4 C (75.9 F) | 0.5 C (0.9 F) | 72 years | 29 of 100 (Routine) |
| 9 June 2026 | Ottumwa Ind AP, US | daily high min (Tie) | 21.7 C (71.1 F) | tie | 57 years | 6 of 100 (Routine) |
| 14 April 2026 | Ottumwa Ind AP, US | daily high min | 18.9 C (66.0 F) | 3.3 C (5.9 F) | 20 years | 19 of 100 (Routine) |
| 13 April 2026 | Ottumwa Ind AP, US | daily high min | 16.7 C (62.1 F) | 2.3 C (4.1 F) | 65 years | 30 of 100 (Routine) |
| 12 April 2026 | Ottumwa Ind AP, US | daily high min | 15.0 C (59.0 F) | 1.1 C (2.0 F) | 57 years | 26 of 100 (Routine) |
| 30 March 2026 | Ottumwa Ind AP, US | daily high max | 30.6 C (87.1 F) | 2.3 C (4.1 F) | 59 years | 27 of 100 (Routine) |
| 25 March 2026 | Ottumwa Ind AP, US | daily high max (Tie) | 26.7 C (80.1 F) | tie | 35 years | 4 of 100 (Routine) |
| 21 March 2026 | Ottumwa Ind AP, US | monthly high max | 32.8 C (91.0 F) | 1.7 C (3.1 F) | 39 years | 30 of 100 (Routine) |
| 20 March 2026 | Ottumwa Ind AP, US | daily high max | 26.7 C (80.1 F) | 2.3 C (4.1 F) | 13 years | 14 of 100 (Routine) |
| 18 March 2026 | Ottumwa Ind AP, US | daily snowfall (Tie) | 0.8 cm (0.3 in) | tie | 65 years | 6 of 100 (Routine) |
| 17 March 2026 | Ottumwa Ind AP, US | daily low min | -15.6 C (3.9 F) | 3.4 C (6.1 F) | 32 years | 21 of 100 (Routine) |
| 17 March 2026 | Ottumwa Ind AP, US | daily low max | -3.9 C (25.0 F) | 0.6 C (1.1 F) | 32 years | 16 of 100 (Routine) |
| 16 March 2026 | Ottumwa Ind AP, US | daily low max | -6.1 C (21.0 F) | 3.3 C (5.9 F) | 65 years | 30 of 100 (Routine) |
| 9 March 2026 | Ottumwa Ind AP, US | daily high min | 11.1 C (52.0 F) | 1.7 C (3.1 F) | 48 years | 23 of 100 (Routine) |
| 9 March 2026 | Ottumwa Ind AP, US | daily high max | 25.0 C (77.0 F) | 2.8 C (5.0 F) | 4 years | 11 of 100 (Routine) |
Climate Trend
75 complete years, 1948 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1948 | 10.5 C | +0.07 C |
| 1949 | 10.6 C | +0.18 C |
| 1950 | 9.0 C | -1.39 C |
| 1951 | 8.8 C | -1.57 C |
| 1952 | 10.8 C | +0.43 C |
| 1953 | 11.5 C | +1.16 C |
| 1954 | 11.4 C | +1.01 C |
| 1955 | 10.6 C | +0.24 C |
| 1956 | 10.9 C | +0.56 C |
| 1957 | 10.4 C | -0.03 C |
| 1958 | 9.9 C | -0.44 C |
| 1959 | 10.0 C | -0.40 C |
| 1960 | 9.5 C | -0.93 C |
| 1961 | 10.0 C | -0.38 C |
| 1962 | 9.7 C | -0.66 C |
| 1963 | 10.2 C | -0.14 C |
| 1964 | 10.9 C | +0.49 C |
| 1965 | 10.1 C | -0.26 C |
| 1966 | 9.7 C | -0.65 C |
| 1967 | 9.9 C | -0.51 C |
| 1968 | 10.3 C | -0.06 C |
| 1969 | 9.6 C | -0.79 C |
| 1970 | 10.2 C | -0.23 C |
| 1971 | 10.5 C | +0.10 C |
| 1972 | 9.2 C | -1.15 C |
| 1973 | 10.9 C | +0.47 C |
| 1974 | 10.3 C | -0.11 C |
| 1975 | 10.4 C | +0.04 C |
| 1976 | 10.1 C | -0.33 C |
| 1977 | 10.7 C | +0.29 C |
| 1978 | 9.0 C | -1.35 C |
| 1979 | 8.9 C | -1.45 C |
| 1980 | 10.4 C | +0.03 C |
| 1981 | 11.1 C | +0.69 C |
| 1982 | 9.7 C | -0.66 C |
| 1983 | 11.0 C | +0.57 C |
| 1984 | 10.8 C | +0.42 C |
| 1985 | 9.8 C | -0.63 C |
| 1987 | 12.4 C | +1.97 C |
| 1988 | 11.2 C | +0.81 C |
| 1989 | 9.7 C | -0.73 C |
| 1990 | 11.4 C | +0.98 C |
| 1991 | 11.1 C | +0.76 C |
| 1992 | 10.6 C | +0.18 C |
| 1993 | 9.5 C | -0.90 C |
| 1994 | 10.4 C | +0.06 C |
| 1995 | 10.1 C | -0.26 C |
| 1996 | 9.3 C | -1.13 C |
| 1997 | 10.1 C | -0.31 C |
| 1998 | 12.1 C | +1.71 C |
| 1999 | 11.6 C | +1.23 C |
| 2002 | 10.6 C | +0.24 C |
| 2003 | 9.7 C | -0.64 C |
| 2004 | 10.1 C | -0.31 C |
| 2005 | 10.8 C | +0.42 C |
| 2006 | 11.2 C | +0.83 C |
| 2007 | 10.5 C | +0.09 C |
| 2008 | 8.8 C | -1.55 C |
| 2009 | 9.3 C | -1.09 C |
| 2010 | 10.1 C | -0.32 C |
| 2011 | 10.4 C | +0.01 C |
| 2012 | 12.2 C | +1.82 C |
| 2013 | 9.6 C | -0.81 C |
| 2014 | 8.7 C | -1.68 C |
| 2015 | 10.9 C | +0.49 C |
| 2016 | 11.7 C | +1.28 C |
| 2017 | 11.7 C | +1.28 C |
| 2018 | 10.4 C | -0.02 C |
| 2019 | 10.0 C | -0.41 C |
| 2020 | 10.6 C | +0.22 C |
| 2021 | 11.0 C | +0.61 C |
| 2022 | 10.0 C | -0.38 C |
| 2023 | 11.5 C | +1.09 C |
| 2024 | 11.8 C | +1.43 C |
| 2025 | 11.1 C | +0.70 C |
The fitted trend in annual mean temperature here over 1948 to 2025 is 0.07 C (-0.01 to 0.16) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.13 F (-0.01 to 0.28) per decade. The slope is a straight line fitted to 75 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.07 C (-0.01 to 0.16) per decade | 0.13 F (-0.01 to 0.28) per decade | 1948 to 2025 | 75 | Not clearly different from zero |
| Mean daily maximum | 0.13 C (0.03 to 0.23) per decade | 0.2 F (0.1 to 0.4) per decade | 1948 to 2025 | 75 | Rise |
| Mean daily minimum | 0.02 C (-0.06 to 0.10) per decade | 0.03 F (-0.11 to 0.18) per decade | 1948 to 2025 | 75 | Not clearly different from zero |
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1948 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 41.1 C (106.0 F) | 2012 | 36.1 C (97.0 F) | 79 |
| Coldest night (TNn) | -32.8 C (-27.0 F) | 1996 | -24.9 C (-12.8 F) | 79 |
| Wettest day (Rx1day) | 135.1 mm (5.3 in) | 1992 | 58.7 mm (2.3 in) | 79 |
| Wettest five days (Rx5day) | 208.6 mm (8.2 in) | 1965 | 94.7 mm (3.7 in) | 79 |
| Longest dry spell (CDD) | 75 days | 1952 | 24 days | 79 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1948 | 38.9 C (102.0 F) |
| 1949 | 35.6 C (96.1 F) |
| 1950 | 33.9 C (93.0 F) |
| 1951 | 36.1 C (97.0 F) |
| 1952 | 37.2 C (99.0 F) |
| 1953 | 38.3 C (100.9 F) |
| 1954 | 39.4 C (102.9 F) |
| 1955 | 38.3 C (100.9 F) |
| 1956 | 39.4 C (102.9 F) |
| 1957 | 37.8 C (100.0 F) |
| 1958 | 35.0 C (95.0 F) |
| 1959 | 33.9 C (93.0 F) |
| 1960 | 35.6 C (96.1 F) |
| 1961 | 35.6 C (96.1 F) |
| 1962 | 35.6 C (96.1 F) |
| 1963 | 37.8 C (100.0 F) |
| 1964 | 37.8 C (100.0 F) |
| 1965 | 37.2 C (99.0 F) |
| 1966 | 40.6 C (105.1 F) |
| 1967 | 34.4 C (93.9 F) |
| 1968 | 36.1 C (97.0 F) |
| 1969 | 34.4 C (93.9 F) |
| 1970 | 37.8 C (100.0 F) |
| 1971 | 35.6 C (96.1 F) |
| 1972 | 36.1 C (97.0 F) |
| 1973 | 34.4 C (93.9 F) |
| 1974 | 37.2 C (99.0 F) |
| 1975 | 35.6 C (96.1 F) |
| 1976 | 35.6 C (96.1 F) |
| 1977 | 38.9 C (102.0 F) |
| 1978 | 34.4 C (93.9 F) |
| 1979 | 35.6 C (96.1 F) |
| 1980 | 39.4 C (102.9 F) |
| 1981 | 35.0 C (95.0 F) |
| 1982 | 35.6 C (96.1 F) |
| 1983 | 40.6 C (105.1 F) |
| 1984 | 37.8 C (100.0 F) |
| 1985 | 36.1 C (97.0 F) |
| 1986 | 35.0 C (95.0 F) |
| 1987 | 38.9 C (102.0 F) |
| 1988 | 40.0 C (104.0 F) |
| 1989 | 35.6 C (96.1 F) |
| 1990 | 36.7 C (98.1 F) |
| 1991 | 37.2 C (99.0 F) |
| 1992 | 33.9 C (93.0 F) |
| 1993 | 34.4 C (93.9 F) |
| 1994 | 35.0 C (95.0 F) |
| 1995 | 37.8 C (100.0 F) |
| 1996 | 35.0 C (95.0 F) |
| 1997 | 36.7 C (98.1 F) |
| 1998 | 36.1 C (97.0 F) |
| 1999 | 39.4 C (102.9 F) |
| 2000 | 37.2 C (99.0 F) |
| 2001 | 36.1 C (97.0 F) |
| 2002 | 35.0 C (95.0 F) |
| 2003 | 38.3 C (100.9 F) |
| 2004 | 32.2 C (90.0 F) |
| 2005 | 37.2 C (99.0 F) |
| 2006 | 35.6 C (96.1 F) |
| 2007 | 33.9 C (93.0 F) |
| 2008 | 34.4 C (93.9 F) |
| 2009 | 33.9 C (93.0 F) |
| 2010 | 33.9 C (93.0 F) |
| 2011 | 40.0 C (104.0 F) |
| 2012 | 41.1 C (106.0 F) |
| 2013 | 38.3 C (100.9 F) |
| 2014 | 33.3 C (91.9 F) |
| 2015 | 33.9 C (93.0 F) |
| 2016 | 36.1 C (97.0 F) |
| 2017 | 38.3 C (100.9 F) |
| 2018 | 36.1 C (97.0 F) |
| 2019 | 35.0 C (95.0 F) |
| 2020 | 35.0 C (95.0 F) |
| 2021 | 34.4 C (93.9 F) |
| 2022 | 36.1 C (97.0 F) |
| 2023 | 39.4 C (102.9 F) |
| 2024 | 35.0 C (95.0 F) |
| 2025 | 35.6 C (96.1 F) |
| 2026 | 36.1 C (97.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1948 | -23.3 C (-9.9 F) |
| 1949 | -26.1 C (-15.0 F) |
| 1950 | -22.8 C (-9.0 F) |
| 1951 | -25.6 C (-14.1 F) |
| 1952 | -23.9 C (-11.0 F) |
| 1953 | -20.0 C (-4.0 F) |
| 1954 | -22.2 C (-8.0 F) |
| 1955 | -25.6 C (-14.1 F) |
| 1956 | -23.9 C (-11.0 F) |
| 1957 | -29.4 C (-20.9 F) |
| 1958 | -28.9 C (-20.0 F) |
| 1959 | -26.1 C (-15.0 F) |
| 1960 | -26.1 C (-15.0 F) |
| 1961 | -24.4 C (-11.9 F) |
| 1962 | -28.9 C (-20.0 F) |
| 1963 | -29.4 C (-20.9 F) |
| 1964 | -22.8 C (-9.0 F) |
| 1965 | -25.0 C (-13.0 F) |
| 1966 | -28.9 C (-20.0 F) |
| 1967 | -23.9 C (-11.0 F) |
| 1968 | -26.7 C (-16.1 F) |
| 1969 | -23.9 C (-11.0 F) |
| 1970 | -29.4 C (-20.9 F) |
| 1971 | -25.6 C (-14.1 F) |
| 1972 | -26.7 C (-16.1 F) |
| 1973 | -23.3 C (-9.9 F) |
| 1974 | -30.0 C (-22.0 F) |
| 1975 | -23.3 C (-9.9 F) |
| 1976 | -23.9 C (-11.0 F) |
| 1977 | -28.3 C (-18.9 F) |
| 1978 | -27.2 C (-17.0 F) |
| 1979 | -28.9 C (-20.0 F) |
| 1980 | -21.1 C (-6.0 F) |
| 1981 | -25.6 C (-14.1 F) |
| 1982 | -30.6 C (-23.1 F) |
| 1983 | -28.3 C (-18.9 F) |
| 1984 | -25.6 C (-14.1 F) |
| 1985 | -29.4 C (-20.9 F) |
| 1986 | -23.3 C (-9.9 F) |
| 1987 | -20.0 C (-4.0 F) |
| 1988 | -25.0 C (-13.0 F) |
| 1989 | -29.4 C (-20.9 F) |
| 1990 | -22.8 C (-9.0 F) |
| 1991 | -22.2 C (-8.0 F) |
| 1992 | -20.0 C (-4.0 F) |
| 1993 | -19.4 C (-2.9 F) |
| 1994 | -27.8 C (-18.0 F) |
| 1995 | -21.7 C (-7.1 F) |
| 1996 | -32.8 C (-27.0 F) |
| 1997 | -23.9 C (-11.0 F) |
| 1998 | -21.7 C (-7.1 F) |
| 1999 | -26.7 C (-16.1 F) |
| 2000 | -26.1 C (-15.0 F) |
| 2001 | -21.7 C (-7.1 F) |
| 2002 | -20.0 C (-4.0 F) |
| 2003 | -22.2 C (-8.0 F) |
| 2004 | -23.3 C (-9.9 F) |
| 2005 | -23.3 C (-9.9 F) |
| 2006 | -22.2 C (-8.0 F) |
| 2007 | -22.8 C (-9.0 F) |
| 2008 | -23.9 C (-11.0 F) |
| 2009 | -28.9 C (-20.0 F) |
| 2010 | -26.1 C (-15.0 F) |
| 2011 | -23.3 C (-9.9 F) |
| 2012 | -17.8 C (0.0 F) |
| 2013 | -28.2 C (-18.8 F) |
| 2014 | -27.1 C (-16.8 F) |
| 2015 | -24.9 C (-12.8 F) |
| 2016 | -24.3 C (-11.7 F) |
| 2017 | -26.6 C (-15.9 F) |
| 2018 | -28.8 C (-19.8 F) |
| 2019 | -29.3 C (-20.7 F) |
| 2020 | -23.8 C (-10.8 F) |
| 2021 | -24.9 C (-12.8 F) |
| 2022 | -23.8 C (-10.8 F) |
| 2023 | -19.9 C (-3.8 F) |
| 2024 | -28.2 C (-18.8 F) |
| 2025 | -24.3 C (-11.7 F) |
| 2026 | -24.4 C (-11.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1948 | 46.7 mm (1.8 in) |
| 1949 | 46.7 mm (1.8 in) |
| 1950 | 56.4 mm (2.2 in) |
| 1951 | 51.1 mm (2.0 in) |
| 1952 | 73.9 mm (2.9 in) |
| 1953 | 34.8 mm (1.4 in) |
| 1954 | 58.9 mm (2.3 in) |
| 1955 | 55.6 mm (2.2 in) |
| 1956 | 50.5 mm (2.0 in) |
| 1957 | 58.2 mm (2.3 in) |
| 1958 | 46.2 mm (1.8 in) |
| 1959 | 58.7 mm (2.3 in) |
| 1960 | 62.7 mm (2.5 in) |
| 1961 | 76.5 mm (3.0 in) |
| 1962 | 84.1 mm (3.3 in) |
| 1963 | 43.4 mm (1.7 in) |
| 1964 | 39.4 mm (1.6 in) |
| 1965 | 84.1 mm (3.3 in) |
| 1966 | 43.4 mm (1.7 in) |
| 1967 | 47.0 mm (1.9 in) |
| 1968 | 62.0 mm (2.4 in) |
| 1969 | 92.2 mm (3.6 in) |
| 1970 | 80.0 mm (3.1 in) |
| 1971 | 52.3 mm (2.1 in) |
| 1972 | 38.4 mm (1.5 in) |
| 1973 | 66.3 mm (2.6 in) |
| 1974 | 59.7 mm (2.4 in) |
| 1975 | 68.8 mm (2.7 in) |
| 1976 | 70.9 mm (2.8 in) |
| 1977 | 64.3 mm (2.5 in) |
| 1978 | 70.9 mm (2.8 in) |
| 1979 | 47.2 mm (1.9 in) |
| 1980 | 59.7 mm (2.4 in) |
| 1981 | 48.8 mm (1.9 in) |
| 1982 | 87.6 mm (3.4 in) |
| 1983 | 64.5 mm (2.5 in) |
| 1984 | 57.7 mm (2.3 in) |
| 1985 | 50.5 mm (2.0 in) |
| 1986 | 53.6 mm (2.1 in) |
| 1987 | 81.5 mm (3.2 in) |
| 1988 | 54.6 mm (2.1 in) |
| 1989 | 96.0 mm (3.8 in) |
| 1990 | 56.9 mm (2.2 in) |
| 1991 | 57.9 mm (2.3 in) |
| 1992 | 135.1 mm (5.3 in) |
| 1993 | 112.5 mm (4.4 in) |
| 1994 | 51.6 mm (2.0 in) |
| 1995 | 47.8 mm (1.9 in) |
| 1996 | 49.8 mm (2.0 in) |
| 1997 | 77.7 mm (3.1 in) |
| 1998 | 74.4 mm (2.9 in) |
| 1999 | 39.9 mm (1.6 in) |
| 2000 | 79.8 mm (3.1 in) |
| 2001 | 57.4 mm (2.3 in) |
| 2002 | 66.3 mm (2.6 in) |
| 2003 | 47.2 mm (1.9 in) |
| 2004 | 55.6 mm (2.2 in) |
| 2005 | 38.1 mm (1.5 in) |
| 2006 | 43.7 mm (1.7 in) |
| 2007 | 82.3 mm (3.2 in) |
| 2008 | 86.6 mm (3.4 in) |
| 2009 | 62.7 mm (2.5 in) |
| 2010 | 115.3 mm (4.5 in) |
| 2011 | 77.5 mm (3.1 in) |
| 2012 | 43.9 mm (1.7 in) |
| 2013 | 124.0 mm (4.9 in) |
| 2014 | 55.9 mm (2.2 in) |
| 2015 | 59.2 mm (2.3 in) |
| 2016 | 36.8 mm (1.4 in) |
| 2017 | 60.2 mm (2.4 in) |
| 2018 | 103.4 mm (4.1 in) |
| 2019 | 51.1 mm (2.0 in) |
| 2020 | 112.5 mm (4.4 in) |
| 2021 | 74.7 mm (2.9 in) |
| 2022 | 67.8 mm (2.7 in) |
| 2023 | 24.6 mm (1.0 in) |
| 2024 | 60.2 mm (2.4 in) |
| 2025 | 39.4 mm (1.6 in) |
| 2026 | 50.5 mm (2.0 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1948 | 65.5 mm (2.6 in) |
| 1949 | 78.4 mm (3.1 in) |
| 1950 | 108.3 mm (4.3 in) |
| 1951 | 72.2 mm (2.8 in) |
| 1952 | 108.2 mm (4.3 in) |
| 1953 | 53.1 mm (2.1 in) |
| 1954 | 109.0 mm (4.3 in) |
| 1955 | 80.5 mm (3.2 in) |
| 1956 | 75.5 mm (3.0 in) |
| 1957 | 98.3 mm (3.9 in) |
| 1958 | 84.9 mm (3.3 in) |
| 1959 | 89.7 mm (3.5 in) |
| 1960 | 91.7 mm (3.6 in) |
| 1961 | 103.0 mm (4.1 in) |
| 1962 | 143.6 mm (5.7 in) |
| 1963 | 70.1 mm (2.8 in) |
| 1964 | 87.9 mm (3.5 in) |
| 1965 | 208.6 mm (8.2 in) |
| 1966 | 60.7 mm (2.4 in) |
| 1967 | 91.4 mm (3.6 in) |
| 1968 | 89.7 mm (3.5 in) |
| 1969 | 100.5 mm (4.0 in) |
| 1970 | 157.3 mm (6.2 in) |
| 1971 | 85.8 mm (3.4 in) |
| 1972 | 66.8 mm (2.6 in) |
| 1973 | 117.4 mm (4.6 in) |
| 1974 | 81.3 mm (3.2 in) |
| 1975 | 106.7 mm (4.2 in) |
| 1976 | 118.1 mm (4.6 in) |
| 1977 | 109.2 mm (4.3 in) |
| 1978 | 112.3 mm (4.4 in) |
| 1979 | 96.4 mm (3.8 in) |
| 1980 | 99.9 mm (3.9 in) |
| 1981 | 94.3 mm (3.7 in) |
| 1982 | 112.0 mm (4.4 in) |
| 1983 | 84.3 mm (3.3 in) |
| 1984 | 89.5 mm (3.5 in) |
| 1985 | 94.4 mm (3.7 in) |
| 1986 | 106.1 mm (4.2 in) |
| 1987 | 101.6 mm (4.0 in) |
| 1988 | 56.7 mm (2.2 in) |
| 1989 | 104.9 mm (4.1 in) |
| 1990 | 99.1 mm (3.9 in) |
| 1991 | 101.1 mm (4.0 in) |
| 1992 | 191.7 mm (7.5 in) |
| 1993 | 141.7 mm (5.6 in) |
| 1994 | 85.1 mm (3.4 in) |
| 1995 | 72.6 mm (2.9 in) |
| 1996 | 130.1 mm (5.1 in) |
| 1997 | 88.1 mm (3.5 in) |
| 1998 | 150.6 mm (5.9 in) |
| 1999 | 45.7 mm (1.8 in) |
| 2000 | 165.4 mm (6.5 in) |
| 2001 | 83.3 mm (3.3 in) |
| 2002 | 113.8 mm (4.5 in) |
| 2003 | 65.1 mm (2.6 in) |
| 2004 | 112.5 mm (4.4 in) |
| 2005 | 64.2 mm (2.5 in) |
| 2006 | 53.6 mm (2.1 in) |
| 2007 | 149.1 mm (5.9 in) |
| 2008 | 99.6 mm (3.9 in) |
| 2009 | 111.9 mm (4.4 in) |
| 2010 | 141.7 mm (5.6 in) |
| 2011 | 125.8 mm (5.0 in) |
| 2012 | 80.2 mm (3.2 in) |
| 2013 | 160.7 mm (6.3 in) |
| 2014 | 102.0 mm (4.0 in) |
| 2015 | 69.6 mm (2.7 in) |
| 2016 | 57.9 mm (2.3 in) |
| 2017 | 90.1 mm (3.5 in) |
| 2018 | 147.3 mm (5.8 in) |
| 2019 | 94.7 mm (3.7 in) |
| 2020 | 130.6 mm (5.1 in) |
| 2021 | 87.9 mm (3.5 in) |
| 2022 | 79.0 mm (3.1 in) |
| 2023 | 54.8 mm (2.2 in) |
| 2024 | 125.3 mm (4.9 in) |
| 2025 | 65.1 mm (2.6 in) |
| 2026 | 88.3 mm (3.5 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1948 | 32 days |
| 1949 | 23 days |
| 1950 | 31 days |
| 1951 | 16 days |
| 1952 | 75 days |
| 1953 | 23 days |
| 1954 | 23 days |
| 1955 | 20 days |
| 1956 | 37 days |
| 1957 | 27 days |
| 1958 | 30 days |
| 1959 | 20 days |
| 1960 | 15 days |
| 1961 | 18 days |
| 1962 | 21 days |
| 1963 | 15 days |
| 1964 | 21 days |
| 1965 | 20 days |
| 1966 | 35 days |
| 1967 | 28 days |
| 1968 | 25 days |
| 1969 | 22 days |
| 1970 | 20 days |
| 1971 | 31 days |
| 1972 | 23 days |
| 1973 | 19 days |
| 1974 | 25 days |
| 1975 | 17 days |
| 1976 | 27 days |
| 1977 | 15 days |
| 1978 | 26 days |
| 1979 | 18 days |
| 1980 | 28 days |
| 1981 | 30 days |
| 1982 | 18 days |
| 1983 | 24 days |
| 1984 | 25 days |
| 1985 | 28 days |
| 1986 | 30 days |
| 1987 | 29 days |
| 1988 | 38 days |
| 1989 | 40 days |
| 1990 | 12 days |
| 1991 | 23 days |
| 1992 | 18 days |
| 1993 | 27 days |
| 1994 | 17 days |
| 1995 | 22 days |
| 1996 | 19 days |
| 1997 | 17 days |
| 1998 | 17 days |
| 1999 | 36 days |
| 2000 | 30 days |
| 2001 | 26 days |
| 2002 | 56 days |
| 2003 | 29 days |
| 2004 | 22 days |
| 2005 | 24 days |
| 2006 | 20 days |
| 2007 | 27 days |
| 2008 | 22 days |
| 2009 | 24 days |
| 2010 | 27 days |
| 2011 | 17 days |
| 2012 | 23 days |
| 2013 | 34 days |
| 2014 | 31 days |
| 2015 | 34 days |
| 2016 | 32 days |
| 2017 | 24 days |
| 2018 | 19 days |
| 2019 | 13 days |
| 2020 | 21 days |
| 2021 | 28 days |
| 2022 | 25 days |
| 2023 | 30 days |
| 2024 | 23 days |
| 2025 | 29 days |
| 2026 | 40 days |
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
75 years with a frostAcross 75 years with a frost, the median last spring frost at Ottumwa Ind AP falls on 19 April and the median first autumn frost on 15 October, which leaves a median of 178 days between them.
In 1994 to 2025 the median growing season was 177 days. That is 8 days fewer than in 1948 to 1977.
Fitted over all years, the growing season changes by -1.1 days per decade at this station.
| Measure | Median, all years | Earliest period (1948 to 1977) | Recent period (1994 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 19 April | 19 April | 21 April | 2 days later | +0.4 days per decade |
| First autumn frost | 15 October | 17 October | 15 October | 2 days earlier | -0.8 days per decade |
| Growing days | 178 days | 185 days | 177 days | 8 days fewer | -1.1 days per decade |
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
77 years, 1948 to 2025A day with at least 59.0 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 140.4 mm (5.5 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 59.0 mm (2.3 in) | |
| 5 years | 77.7 mm (3.1 in) | |
| 10 years | 91.3 mm (3.6 in) | |
| 25 years | 109.8 mm (4.3 in) | |
| 50 years | 124.7 mm (4.9 in) | |
| 100 years | 140.4 mm (5.5 in) | Longer than the 77 years of record |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 77 years of values from 1948 to 2025.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 135.1 mm (5.3 in) in 1992; 124.0 mm (4.9 in) in 2013; 115.3 mm (4.5 in) in 2010.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Ottumwa Ind AP, at 1989. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1989 ran 0.2 C (0.3 F) lower than in the years before (possible change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1989 | -0.2 | -0.3 | possible | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Climate Twins
2011 to 2025 against 1961 to 1990Over 2011 to 2025, Ottumwa Ind AP had a mean temperature of 10.8 C (51.4 F) and 816.5 mm (32.1 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Pontiac (United States, 321 km away), Rantoul (United States, 372 km away) and Lafayette Purdue UNIV AP (United States, 469 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Pontiac | United States | 321 km (199 mi) | 10.6 C (51.1 F) | 874.9 mm (34.4 in) | 0.69 |
| Rantoul | United States | 372 km (231 mi) | 10.7 C (51.2 F) | 920.8 mm (36.3 in) | 0.69 |
| Lafayette Purdue UNIV AP | United States | 469 km (291 mi) | 10.7 C (51.2 F) | 915.5 mm (36.0 in) | 0.70 |
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
Download the Data
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-15 (15 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-15).