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Built 2026-10-19 (19 October 2026)

Ottumwa Threshold Days by Year

6 fixed thresholds counted per year at Ottumwa (USC00136391): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ottumwa Thresholds

  • Ottumwa: days with 10 mm (0.39 in) or more of precipitation in 41 years, most in 1919 with 42.
  • Ottumwa: days with 25 mm (0.98 in) or more of precipitation in 41 years, most in 1919 with 15.
  • Ottumwa: days with 50 mm (1.97 in) or more of precipitation in 37 years, most in 1918 with 4.
  • Ottumwa: days with 10 cm (3.9 in) or more of snowfall in 17 years, most in 1959 with 5.
  • 6 fixed thresholds have at least one qualifying day at Ottumwa.
41 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Ottumwa Days per year at Ottumwa with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 42 in 1919. 02040601918: 261919: 421920: 281922: 231923: 241924: 291925: 341926: 301927: 401928: 361929: 241930: 251932: 351933: 271934: 261935: 351936: 221938: 271940: 241941: 311943: 321944: 351945: 301946: 301947: 321949: 281950: 191951: 391952: 281953: 151954: 271955: 211956: 171957: 271958: 221959: 381960: 321961: 341962: 291963: 191964: 18191819241929193519431949195419591964
Days per year at Ottumwa with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 42 in 1919.
Days with 10 mm (0.39 in) or more of precipitation per year at Ottumwa
YearDaysDecade average
19182634
19194234
19202829.8
19222329.8
19232429.8
19242929.8
19253429.8
19263029.8
19274029.8
19283629.8
19292429.8
19302528.1
19323528.1
19332728.1
19342628.1
19353528.1
19362228.1
19382728.1
19402430.3
19413130.3
19433230.3
19443530.3
19453030.3
19463030.3
19473230.3
19492830.3
19501925.3
19513925.3
19522825.3
19531525.3
19542725.3
19552125.3
19561725.3
19572725.3
19582225.3
19593825.3
19603226.4
19613426.4
19622926.4
19631926.4
19641826.4
First to last qualifying date each year at Ottumwa For each year, a bar from the first to the last day at Ottumwa meeting 10 mm (0.39 in). 1918: 5 January 1918 to 24 December 19181919: 12 February 1919 to 28 November 19191920: 3 March 1920 to 25 December 19201922: 4 January 1922 to 13 November 19221923: 3 March 1923 to 12 December 19231924: 9 January 1924 to 4 December 19241925: 8 February 1925 to 4 December 19251926: 18 February 1926 to 26 November 19261927: 5 February 1927 to 29 December 19271928: 8 February 1928 to 14 December 19281929: 13 March 1929 to 14 November 19291930: 2 January 1930 to 5 December 19301932: 1 January 1932 to 25 December 19321933: 21 January 1933 to 26 October 19331934: 25 February 1934 to 1 December 19341935: 8 January 1935 to 27 November 19351936: 17 January 1936 to 6 December 19361938: 24 January 1938 to 8 November 19381940: 14 January 1940 to 16 December 19401941: 26 January 1941 to 26 December 19411943: 3 February 1943 to 6 December 19431944: 27 January 1944 to 5 December 19441945: 15 January 1945 to 30 December 19451946: 5 January 1946 to 13 December 19461947: 3 January 1947 to 4 December 19471949: 19 January 1949 to 22 December 19491950: 1 January 1950 to 9 November 19501951: 16 February 1951 to 13 November 19511952: 4 March 1952 to 23 December 19521953: 6 February 1953 to 10 December 19531954: 16 February 1954 to 14 October 19541955: 5 January 1955 to 29 September 19551956: 28 March 1956 to 21 November 19561957: 10 January 1957 to 25 December 19571958: 22 January 1958 to 18 November 19581959: 21 January 1959 to 28 December 19591960: 12 January 1960 to 15 November 19601961: 3 February 1961 to 23 December 19611962: 6 January 1962 to 16 November 19621963: 4 March 1963 to 23 November 19631964: 13 February 1964 to 23 September 19641918192519321940194719541960JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Ottumwa meeting 10 mm (0.39 in).
First to last qualifying date each year at Ottumwa
YearFirst dateLast date
19181918-01-051918-12-24
19191919-02-121919-11-28
19201920-03-031920-12-25
19221922-01-041922-11-13
19231923-03-031923-12-12
19241924-01-091924-12-04
19251925-02-081925-12-04
19261926-02-181926-11-26
19271927-02-051927-12-29
19281928-02-081928-12-14
19291929-03-131929-11-14
19301930-01-021930-12-05
19321932-01-011932-12-25
19331933-01-211933-10-26
19341934-02-251934-12-01
19351935-01-081935-11-27
19361936-01-171936-12-06
19381938-01-241938-11-08
19401940-01-141940-12-16
19411941-01-261941-12-26
19431943-02-031943-12-06
19441944-01-271944-12-05
19451945-01-151945-12-30
19461946-01-051946-12-13
19471947-01-031947-12-04
19491949-01-191949-12-22
19501950-01-011950-11-09
19511951-02-161951-11-13
19521952-03-041952-12-23
19531953-02-061953-12-10
19541954-02-161954-10-14
19551955-01-051955-09-29
19561956-03-281956-11-21
19571957-01-101957-12-25
19581958-01-221958-11-18
19591959-01-211959-12-28
19601960-01-121960-11-15
19611961-02-031961-12-23
19621962-01-061962-11-16
19631963-03-041963-11-23
19641964-02-131964-09-23

Every Fixed Threshold

Fixed thresholds at Ottumwa
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain4142191918
25 mm (0.98 in): Days with 25 mm or more rain411519198
50 mm (1.97 in): Days with 50 mm or more rain37419181
100 mm (3.94 in): Days with 100 mm or more rain4119181
10 cm (3.9 in): Days with 10 cm or more snowfall17519591
25 cm (9.8 in): Days with 25 cm or more snowfall2119521

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1918.

Download the Data

  • 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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

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