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Built 2026-10-15 (15 October 2026)

Ottumwa Weather Records (USC00136391)

Record envelope, standing records and threshold days for Ottumwa (USC00136391), Iowa, United States, with 48 years of record.

Key Facts for Ottumwa

  • Ottumwa (USC00136391) is a weather station in Iowa, United States at 41.02 latitude and -92.43 longitude, 198 m (650 ft) above sea level.
  • The station reports from 1917 to 1964, 48 years of record.
  • 0 records set at Ottumwa still stand.
  • Records are tracked for prcp, snow: an element needs 30 years of data to be eligible.
  • Ottumwa set a daily record snowfall of 5.1 cm (2.0 in) on 26 December 1964.

About the Station

  • Location: Iowa, United States, 41.02 latitude, -92.43 longitude.
  • Elevation: 198 m (650 ft).
  • Period of record: 1917 to 1964, 48 years.
  • Eligible elements: prcp, snow.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Ottumwa, with 2026 drawn through them The band shows the record high and record low for each calendar day at Ottumwa. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 000111 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Ottumwa. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Ottumwa, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
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Which Years Hold Standing Records

0 standing records
Standing records at Ottumwa by the year they were set 0 records at Ottumwa still stand. 00000000000
0 records at Ottumwa still stand.
Standing records at Ottumwa by the year they were set
Year setStanding records

Wettest Day of Each Month

Jun: 119.4 mm (4.7 in)
Record daily precipitation for each month at Ottumwa The wettest day on record for each calendar month at Ottumwa. The most was 119.4 mm (4.7 in) on 18 June 1946. 050100150 Jan: 38.1 mm (1.5 in), 24 January 1938 Jan Feb: 40.6 mm (1.6 in), 22 February 1922 Feb Mar: 69.6 mm (2.7 in), 15 March 1919 Mar Apr: 68.6 mm (2.7 in), 19 April 1927 Apr May: 66.3 mm (2.6 in), 19 May 1927 May Jun: 119.4 mm (4.7 in), 18 June 1946 Jun Jul: 93.5 mm (3.7 in), 15 July 1952 Jul Aug: 110.2 mm (4.3 in), 22 August 1955 Aug Sep: 88.9 mm (3.5 in), 15 September 1926 Sep Oct: 69.6 mm (2.7 in), 5 October 1959 Oct Nov: 82.6 mm (3.3 in), 5 November 1938 Nov Dec: 52.1 mm (2.1 in), 4 December 1924 Dec
The wettest day on record for each calendar month at Ottumwa. The most was 119.4 mm (4.7 in) on 18 June 1946.
Record daily precipitation for each month at Ottumwa
MonthRecord daily precipitation (mm)Date
Jan38.1 mm (1.5 in)24 January 1938
Feb40.6 mm (1.6 in)22 February 1922
Mar69.6 mm (2.7 in)15 March 1919
Apr68.6 mm (2.7 in)19 April 1927
May66.3 mm (2.6 in)19 May 1927
Jun119.4 mm (4.7 in)18 June 1946
Jul93.5 mm (3.7 in)15 July 1952
Aug110.2 mm (4.3 in)22 August 1955
Sep88.9 mm (3.5 in)15 September 1926
Oct69.6 mm (2.7 in)5 October 1959
Nov82.6 mm (3.3 in)5 November 1938
Dec52.1 mm (2.1 in)4 December 1924

Latest Records

20
Latest records at Ottumwa
DateStationRecordValueBeat old record byOld record stoodSignificance
26 December 1964Ottumwa, USdaily snowfall5.1 cm (2.0 in)2.1 cm (0.8 in)23 years15 of 100 (Routine)
3 December 1964Ottumwa, USdaily snowfall5.1 cm (2.0 in)5.1 cm (2.0 in)46 years30 of 100 (Routine)
30 August 1964Ottumwa, USdaily rain20.8 mm (0.8 in)9.4 mm (0.37 in)46 years20 of 100 (Routine)
20 June 1964Ottumwa, USdaily rain37.3 mm (1.5 in)7.6 mm (0.30 in)25 years15 of 100 (Routine)
26 March 1964Ottumwa, USdaily snowfall2.5 cm (1.0 in)2.5 cm (1.0 in)41 years20 of 100 (Routine)
16 February 1964Ottumwa, USdaily snowfall7.6 cm (3.0 in)1.2 cm (0.5 in)10 years9 of 100 (Routine)
13 February 1964Ottumwa, USdaily snowfall (Tie)7.6 cm (3.0 in)tie14 years2 of 100 (Routine)
23 November 1963Ottumwa, USdaily rain22.4 mm (0.9 in)4.6 mm (0.18 in)32 years17 of 100 (Routine)
22 November 1963Ottumwa, USdaily rain34.5 mm (1.4 in)9.1 mm (0.36 in)28 years20 of 100 (Routine)
6 August 1963Ottumwa, USdaily rain50.0 mm (2.0 in)1.7 mm (0.07 in)38 years16 of 100 (Routine)
13 July 1963Ottumwa, USdaily rain45.0 mm (1.8 in)19.6 mm (0.8 in)42 years30 of 100 (Routine)
6 July 1963Ottumwa, USdaily rain43.7 mm (1.7 in)10.7 mm (0.4 in)33 years21 of 100 (Routine)
9 February 1963Ottumwa, USdaily rain7.6 mm (0.30 in)0.5 mm (0.02 in)23 years10 of 100 (Routine)
9 February 1963Ottumwa, USdaily snowfall (Tie)8.9 cm (3.5 in)tie23 years2 of 100 (Routine)
11 January 1963Ottumwa, USdaily snowfall1.3 cm (0.5 in)1.3 cm (0.5 in)44 years19 of 100 (Routine)
20 October 1962Ottumwa, USdaily rain43.4 mm (1.7 in)19.3 mm (0.8 in)32 years31 of 100 (Routine)
16 October 1962Ottumwa, USdaily rain (Tie)21.6 mm (0.9 in)tie28 years3 of 100 (Routine)
2 October 1962Ottumwa, USdaily rain23.4 mm (0.9 in)0.5 mm (0.02 in)35 years14 of 100 (Routine)
23 July 1962Ottumwa, USdaily rain10.2 mm (0.4 in)4.6 mm (0.18 in)0 years7 of 100 (Routine)
20 July 1962Ottumwa, USdaily rain68.3 mm (2.7 in)48.0 mm (1.9 in)37 years50 of 100 (Notable)

Extremes by Year

1917 to 1964
Yearly extremes at Ottumwa: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)119.4 mm (4.7 in)194668.6 mm (2.7 in)47
Wettest five days (Rx5day)199.7 mm (7.9 in)194697.6 mm (3.8 in)47
Longest dry spell (CDD)63 days195222 days47

Wettest day (Rx1day)

Wettest day (Rx1day) at Ottumwa by year The wettest day of the year at Ottumwa, 1917 to 1964. The record is 119.4 mm (4.7 in) in 1946, marked on the chart; the median year is 68.6 mm (2.7 in). 2040608010012019201930194019501960Record: 119.4 mm (4.7 in) in 1946
The wettest day of the year at Ottumwa, 1917 to 1964. The record is 119.4 mm (4.7 in) in 1946, marked on the chart; the median year is 68.6 mm (2.7 in).
Wettest day (Rx1day) at Ottumwa by year
YearWettest day (Rx1day)
191743.2 mm (1.7 in)
1918109.7 mm (4.3 in)
191969.6 mm (2.7 in)
192052.1 mm (2.1 in)
192150.8 mm (2.0 in)
192255.9 mm (2.2 in)
192358.4 mm (2.3 in)
192487.4 mm (3.4 in)
192574.9 mm (2.9 in)
192688.9 mm (3.5 in)
192768.6 mm (2.7 in)
192866.5 mm (2.6 in)
192957.2 mm (2.3 in)
193077.5 mm (3.1 in)
193183.8 mm (3.3 in)
193261.0 mm (2.4 in)
193367.3 mm (2.6 in)
193444.7 mm (1.8 in)
193585.1 mm (3.4 in)
193681.3 mm (3.2 in)
193752.3 mm (2.1 in)
193882.6 mm (3.3 in)
193977.7 mm (3.1 in)
194073.2 mm (2.9 in)
194150.8 mm (2.0 in)
194355.9 mm (2.2 in)
194478.7 mm (3.1 in)
194569.6 mm (2.7 in)
1946119.4 mm (4.7 in)
194759.7 mm (2.4 in)
194876.5 mm (3.0 in)
194991.2 mm (3.6 in)
195059.2 mm (2.3 in)
195159.2 mm (2.3 in)
1952111.3 mm (4.4 in)
195339.9 mm (1.6 in)
195470.6 mm (2.8 in)
1955110.2 mm (4.3 in)
195672.4 mm (2.9 in)
195747.8 mm (1.9 in)
195856.4 mm (2.2 in)
195978.7 mm (3.1 in)
196061.0 mm (2.4 in)
196182.8 mm (3.3 in)
196268.3 mm (2.7 in)
196350.0 mm (2.0 in)
196440.4 mm (1.6 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Ottumwa by year The wettest five days of the year at Ottumwa, 1917 to 1964. The record is 199.7 mm (7.9 in) in 1946, marked on the chart; the median year is 97.6 mm (3.8 in). 05010015020019201930194019501960Record: 199.7 mm (7.9 in) in 1946
The wettest five days of the year at Ottumwa, 1917 to 1964. The record is 199.7 mm (7.9 in) in 1946, marked on the chart; the median year is 97.6 mm (3.8 in).
Wettest five days (Rx5day) at Ottumwa by year
YearWettest five days (Rx5day)
191784.3 mm (3.3 in)
1918109.7 mm (4.3 in)
1919130.6 mm (5.1 in)
192085.9 mm (3.4 in)
192188.9 mm (3.5 in)
192287.6 mm (3.4 in)
192376.8 mm (3.0 in)
1924116.6 mm (4.6 in)
1925143.4 mm (5.6 in)
1926134.9 mm (5.3 in)
192790.7 mm (3.6 in)
192882.6 mm (3.3 in)
192976.2 mm (3.0 in)
193040.6 mm (1.6 in)
1931140.6 mm (5.5 in)
1932118.6 mm (4.7 in)
1933130.9 mm (5.2 in)
193461.7 mm (2.4 in)
1935121.5 mm (4.8 in)
1936134.6 mm (5.3 in)
193755.6 mm (2.2 in)
1938135.9 mm (5.4 in)
1939171.4 mm (6.7 in)
194097.6 mm (3.8 in)
194184.3 mm (3.3 in)
194393.7 mm (3.7 in)
194491.7 mm (3.6 in)
194599.3 mm (3.9 in)
1946199.7 mm (7.9 in)
194778.3 mm (3.1 in)
194879.8 mm (3.1 in)
1949116.8 mm (4.6 in)
1950100.5 mm (4.0 in)
195187.9 mm (3.5 in)
1952138.7 mm (5.5 in)
195356.4 mm (2.2 in)
1954122.0 mm (4.8 in)
1955110.2 mm (4.3 in)
195695.8 mm (3.8 in)
195769.6 mm (2.7 in)
195874.7 mm (2.9 in)
195998.6 mm (3.9 in)
1960120.7 mm (4.8 in)
1961127.5 mm (5.0 in)
1962113.8 mm (4.5 in)
196379.2 mm (3.1 in)
196496.6 mm (3.8 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Ottumwa by year The longest dry spell of the year at Ottumwa, 1917 to 1964. The record is 63 days in 1952, marked on the chart; the median year is 22 days. 02040608019201930194019501960Record: 63 days in 1952
The longest dry spell of the year at Ottumwa, 1917 to 1964. The record is 63 days in 1952, marked on the chart; the median year is 22 days.
Longest dry spell (CDD) at Ottumwa by year
YearLongest dry spell (CDD)
191721 days
191821 days
191935 days
192022 days
192117 days
192220 days
192318 days
192420 days
192524 days
192616 days
192720 days
192818 days
192918 days
193029 days
193118 days
193223 days
193329 days
193435 days
193517 days
193622 days
193716 days
193843 days
193925 days
194020 days
194118 days
194327 days
194427 days
194518 days
194621 days
194726 days
194829 days
194926 days
195039 days
195116 days
195263 days
195331 days
195425 days
195516 days
195638 days
195729 days
195824 days
195921 days
196025 days
196114 days
196234 days
196315 days
196435 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.

Rainfall Return Levels

41 years, 1918 to 1964

A day with at least 67.7 mm (2.7 in) of rain is expected about once in 2 years. A day with at least 130.1 mm (5.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Ottumwa: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years67.7 mm (2.7 in)
5 years85.3 mm (3.4 in)
10 years96.5 mm (3.8 in)
25 years110.4 mm (4.3 in)
50 years120.4 mm (4.7 in)Longer than the 41 years of record
100 years130.1 mm (5.1 in)Longer than the 41 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, 41 years of values from 1918 to 1964.

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: 119.4 mm (4.7 in) in 1946; 111.3 mm (4.4 in) in 1952; 110.2 mm (4.3 in) in 1955.

Download the Data

  • Data for Ottumwa standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Ottumwa threshold days by year: CSV or JSON. Field meanings are on the data page.

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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2025-12-31).