Dewitt Weather Records (USC00132235)

Record envelope, standing records and threshold days for Dewitt (USC00132235), Iowa, United States, with 73 years of record.

Key Facts for Dewitt

Dewitt (USC00132235) is a weather station in Iowa, United States at 41.81 latitude and -90.54 longitude, 209 m (685 ft) above sea level.
The station reports from 1954 to 2026, 73 years of record.
478 records set at Dewitt still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Dewitt set a daily record precipitation of 41.9 mm (1.6 in) on 1 October 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, 41.81 latitude, -90.54 longitude.
Elevation: 209 m (685 ft).
Period of record: 1954 to 2026, 73 years.
Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Dewitt. 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 Dewitt, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	n/a	n/a
May	31.1 C (88.0 F)	0.0 C (32.0 F)	n/a	n/a
Jun	33.3 C (91.9 F)	5.0 C (41.0 F)	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	33.9 C (93.0 F)	8.3 C (46.9 F)	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	30.0 C (86.0 F)	-6.1 C (21.0 F)	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Which Years Hold Standing Records

478 standing records

478 records at Dewitt still stand. 1980 holds the most, with 183.

All-Time Record Progression

3 new records

3 all-time records were set at Dewitt between 9 July 1986 and 23 July 2011. Each dot is a new record.

When Dewitt set new all-time records
Date	Kind	Detail
1986-07-09	Record daily precipitation	Record daily precipitation 132.3 mm (5.2 in)
2011-02-02	Record daily snowfall	Record daily snowfall 35.6 cm (14.0 in)
2011-07-23	Record daily precipitation	Record daily precipitation 133.9 mm (5.3 in)

Wettest Day of Each Month

Jul: 133.9 mm (5.3 in)

The wettest day on record for each calendar month at Dewitt. The most was 133.9 mm (5.3 in) on 23 July 2011.

Record daily precipitation for each month at Dewitt
Month	Record daily precipitation (mm)	Date
Jan	46.2 mm (1.8 in)	29 January 2006
Feb	55.4 mm (2.2 in)	9 February 2001
Mar	83.8 mm (3.3 in)	5 March 1976
Apr	127.8 mm (5.0 in)	18 April 2013
May	69.3 mm (2.7 in)	26 May 2010
Jun	101.6 mm (4.0 in)	17 June 1990
Jul	133.9 mm (5.3 in)	23 July 2011
Aug	112.5 mm (4.4 in)	15 August 1981
Sep	115.3 mm (4.5 in)	8 September 2016
Oct	85.9 mm (3.4 in)	19 October 1984
Nov	62.0 mm (2.4 in)	5 November 2022
Dec	48.3 mm (1.9 in)	23 December 1979

Period of Record Coverage

1979 to 1981

3 years of record at Dewitt, 1979 to 1981. 3 years have data for under 90 percent of days and are left out of rankings: 1979, 1980, 1981.

Latest Records

Latest records at Dewitt
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
1 October 2026	Dewitt, US	daily rain (Provisional)	41.9 mm (1.6 in)	12.7 mm (0.5 in)	64 years	37 of 100 (Notable)
15 September 2026	Dewitt, US	daily rain (Provisional)	46.0 mm (1.8 in)	7.9 mm (0.31 in)	28 years	20 of 100 (Routine)
9 September 2026	Dewitt, US	daily rain (Provisional)	35.6 mm (1.4 in)	5.4 mm (0.21 in)	60 years	28 of 100 (Routine)
1 August 2026	Dewitt, US	daily rain	66.0 mm (2.6 in)	19.3 mm (0.8 in)	68 years	38 of 100 (Notable)
22 June 2026	Dewitt, US	daily rain	47.8 mm (1.9 in)	12.2 mm (0.5 in)	5 years	16 of 100 (Routine)
11 June 2026	Dewitt, US	daily rain	40.6 mm (1.6 in)	12.9 mm (0.5 in)	68 years	36 of 100 (Notable)
6 March 2026	Dewitt, US	daily rain	33.0 mm (1.3 in)	16.0 mm (0.6 in)	64 years	43 of 100 (Notable)
9 January 2026	Dewitt, US	daily rain	25.4 mm (1.0 in)	15.0 mm (0.6 in)	2 years	31 of 100 (Routine)
28 December 2025	Dewitt, US	daily rain	24.9 mm (1.0 in)	2.5 mm (0.10 in)	66 years	20 of 100 (Routine)
7 December 2025	Dewitt, US	daily snowfall (Tie)	15.2 cm (6.0 in)	tie	31 years	4 of 100 (Routine)
30 November 2025	Dewitt, US	daily snowfall	19.1 cm (7.5 in)	0.6 cm (0.2 in)	51 years	23 of 100 (Routine)
21 July 2025	Dewitt, US	daily rain	33.0 mm (1.3 in)	9.1 mm (0.36 in)	22 years	18 of 100 (Routine)
20 July 2025	Dewitt, US	daily rain	64.0 mm (2.5 in)	37.1 mm (1.5 in)	19 years	34 of 100 (Routine)
12 July 2025	Dewitt, US	daily rain	41.9 mm (1.6 in)	14.0 mm (0.6 in)	2 years	15 of 100 (Routine)
20 May 2025	Dewitt, US	daily rain	34.3 mm (1.4 in)	5.9 mm (0.23 in)	38 years	22 of 100 (Routine)
30 August 2024	Dewitt, US	daily rain	53.3 mm (2.1 in)	7.1 mm (0.28 in)	8 years	13 of 100 (Routine)
29 July 2024	Dewitt, US	daily rain	48.8 mm (1.9 in)	5.4 mm (0.21 in)	3 years	10 of 100 (Routine)
16 July 2024	Dewitt, US	daily rain	33.0 mm (1.3 in)	8.4 mm (0.33 in)	32 years	21 of 100 (Routine)
15 July 2024	Dewitt, US	daily rain	45.7 mm (1.8 in)	14.5 mm (0.6 in)	1 year	15 of 100 (Routine)
3 April 2024	Dewitt, US	daily rain	80.0 mm (3.1 in)	48.5 mm (1.9 in)	18 years	52 of 100 (Notable)

Extremes by Year

1954 to 2026

Yearly extremes at Dewitt: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	33.9 C (93.0 F)	1979	33.3 C (91.9 F)	3
Coldest night (TNn)	-6.1 C (21.0 F)	1981	0.0 C (32.0 F)	3
Wettest day (Rx1day)	133.9 mm (5.3 in)	2011	67.3 mm (2.6 in)	73
Wettest five days (Rx5day)	189.0 mm (7.4 in)	1990	99.8 mm (3.9 in)	73
Longest dry spell (CDD)	37 days	1988	20 days	73

Hottest day (TXx)

The hottest day of the year at Dewitt, 1954 to 2026. The record is 33.9 C (93.0 F) in 1979, marked on the chart; the median year is 33.3 C (91.9 F).

Hottest day (TXx) at Dewitt by year
Year	Hottest day (TXx)
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	33.9 C (93.0 F)
1980	33.3 C (91.9 F)
1981	30.0 C (86.0 F)
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a
2011	n/a
2012	n/a
2013	n/a
2014	n/a
2015	n/a
2016	n/a
2017	n/a
2018	n/a
2019	n/a
2020	n/a
2021	n/a
2022	n/a
2023	n/a
2024	n/a
2025	n/a
2026	n/a

Coldest night (TNn)

The coldest night of the year at Dewitt, 1954 to 2026. The record is -6.1 C (21.0 F) in 1981, marked on the chart; the median year is 0.0 C (32.0 F).

Coldest night (TNn) at Dewitt by year
Year	Coldest night (TNn)
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	5.0 C (41.0 F)
1980	0.0 C (32.0 F)
1981	-6.1 C (21.0 F)
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a
2011	n/a
2012	n/a
2013	n/a
2014	n/a
2015	n/a
2016	n/a
2017	n/a
2018	n/a
2019	n/a
2020	n/a
2021	n/a
2022	n/a
2023	n/a
2024	n/a
2025	n/a
2026	n/a

Wettest day (Rx1day)

The wettest day of the year at Dewitt, 1954 to 2026. The record is 133.9 mm (5.3 in) in 2011, marked on the chart; the median year is 67.3 mm (2.6 in).

Wettest day (Rx1day) at Dewitt by year
Year	Wettest day (Rx1day)
1954	49.8 mm (2.0 in)
1955	44.7 mm (1.8 in)
1956	77.5 mm (3.1 in)
1957	52.6 mm (2.1 in)
1958	49.3 mm (1.9 in)
1959	91.7 mm (3.6 in)
1960	67.3 mm (2.6 in)
1961	73.7 mm (2.9 in)
1962	52.1 mm (2.1 in)
1963	96.5 mm (3.8 in)
1964	34.3 mm (1.4 in)
1965	72.4 mm (2.9 in)
1966	52.8 mm (2.1 in)
1967	71.6 mm (2.8 in)
1968	51.8 mm (2.0 in)
1969	38.1 mm (1.5 in)
1970	68.6 mm (2.7 in)
1971	71.4 mm (2.8 in)
1972	72.1 mm (2.8 in)
1973	85.1 mm (3.4 in)
1974	66.8 mm (2.6 in)
1975	30.5 mm (1.2 in)
1976	83.8 mm (3.3 in)
1977	64.0 mm (2.5 in)
1978	36.6 mm (1.4 in)
1979	57.9 mm (2.3 in)
1980	56.4 mm (2.2 in)
1981	112.5 mm (4.4 in)
1982	59.7 mm (2.4 in)
1983	46.0 mm (1.8 in)
1984	85.9 mm (3.4 in)
1985	50.0 mm (2.0 in)
1986	132.3 mm (5.2 in)
1987	103.6 mm (4.1 in)
1988	40.1 mm (1.6 in)
1989	58.7 mm (2.3 in)
1990	101.6 mm (4.0 in)
1991	56.4 mm (2.2 in)
1992	50.0 mm (2.0 in)
1993	94.2 mm (3.7 in)
1994	46.2 mm (1.8 in)
1995	68.1 mm (2.7 in)
1996	49.3 mm (1.9 in)
1997	62.7 mm (2.5 in)
1998	81.8 mm (3.2 in)
1999	57.2 mm (2.3 in)
2000	50.3 mm (2.0 in)
2001	89.7 mm (3.5 in)
2002	82.6 mm (3.3 in)
2003	45.0 mm (1.8 in)
2004	59.2 mm (2.3 in)
2005	35.8 mm (1.4 in)
2006	46.2 mm (1.8 in)
2007	124.5 mm (4.9 in)
2008	54.6 mm (2.1 in)
2009	93.7 mm (3.7 in)
2010	69.3 mm (2.7 in)
2011	133.9 mm (5.3 in)
2012	36.1 mm (1.4 in)
2013	127.8 mm (5.0 in)
2014	68.1 mm (2.7 in)
2015	82.6 mm (3.3 in)
2016	115.3 mm (4.5 in)
2017	112.8 mm (4.4 in)
2018	86.4 mm (3.4 in)
2019	60.5 mm (2.4 in)
2020	73.9 mm (2.9 in)
2021	63.5 mm (2.5 in)
2022	67.3 mm (2.6 in)
2023	68.6 mm (2.7 in)
2024	80.0 mm (3.1 in)
2025	64.0 mm (2.5 in)
2026	69.9 mm (2.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Dewitt, 1954 to 2026. The record is 189.0 mm (7.4 in) in 1990, marked on the chart; the median year is 99.8 mm (3.9 in).

Wettest five days (Rx5day) at Dewitt by year
Year	Wettest five days (Rx5day)
1954	98.3 mm (3.9 in)
1955	69.3 mm (2.7 in)
1956	81.2 mm (3.2 in)
1957	98.1 mm (3.9 in)
1958	88.4 mm (3.5 in)
1959	103.4 mm (4.1 in)
1960	92.7 mm (3.6 in)
1961	157.3 mm (6.2 in)
1962	75.7 mm (3.0 in)
1963	125.2 mm (4.9 in)
1964	49.3 mm (1.9 in)
1965	124.2 mm (4.9 in)
1966	78.5 mm (3.1 in)
1967	117.1 mm (4.6 in)
1968	81.0 mm (3.2 in)
1969	67.0 mm (2.6 in)
1970	122.7 mm (4.8 in)
1971	72.4 mm (2.9 in)
1972	85.9 mm (3.4 in)
1973	102.6 mm (4.0 in)
1974	133.1 mm (5.2 in)
1975	45.5 mm (1.8 in)
1976	101.9 mm (4.0 in)
1977	83.4 mm (3.3 in)
1978	67.8 mm (2.7 in)
1979	136.9 mm (5.4 in)
1980	81.0 mm (3.2 in)
1981	146.5 mm (5.8 in)
1982	90.5 mm (3.6 in)
1983	122.6 mm (4.8 in)
1984	126.8 mm (5.0 in)
1985	73.9 mm (2.9 in)
1986	184.0 mm (7.2 in)
1987	129.3 mm (5.1 in)
1988	51.3 mm (2.0 in)
1989	86.4 mm (3.4 in)
1990	189.0 mm (7.4 in)
1991	75.0 mm (3.0 in)
1992	123.3 mm (4.9 in)
1993	99.2 mm (3.9 in)
1994	108.6 mm (4.3 in)
1995	116.9 mm (4.6 in)
1996	115.3 mm (4.5 in)
1997	77.2 mm (3.0 in)
1998	96.8 mm (3.8 in)
1999	75.5 mm (3.0 in)
2000	86.4 mm (3.4 in)
2001	99.9 mm (3.9 in)
2002	125.6 mm (4.9 in)
2003	67.1 mm (2.6 in)
2004	109.5 mm (4.3 in)
2005	68.1 mm (2.7 in)
2006	58.2 mm (2.3 in)
2007	129.6 mm (5.1 in)
2008	68.5 mm (2.7 in)
2009	153.9 mm (6.1 in)
2010	115.6 mm (4.6 in)
2011	62.2 mm (2.4 in)
2012	65.3 mm (2.6 in)
2013	138.2 mm (5.4 in)
2014	113.2 mm (4.5 in)
2015	147.6 mm (5.8 in)
2016	115.3 mm (4.5 in)
2017	133.1 mm (5.2 in)
2018	148.7 mm (5.9 in)
2019	110.7 mm (4.4 in)
2020	137.2 mm (5.4 in)
2021	78.3 mm (3.1 in)
2022	71.4 mm (2.8 in)
2023	104.2 mm (4.1 in)
2024	99.8 mm (3.9 in)
2025	97.0 mm (3.8 in)
2026	127.7 mm (5.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Dewitt, 1954 to 2026. The record is 37 days in 1988, marked on the chart; the median year is 20 days.

Longest dry spell (CDD) at Dewitt by year
Year	Longest dry spell (CDD)
1954	17 days
1955	20 days
1956	17 days
1957	29 days
1958	26 days
1959	15 days
1960	16 days
1961	16 days
1962	17 days
1963	25 days
1964	19 days
1965	16 days
1966	19 days
1967	29 days
1968	36 days
1969	27 days
1970	17 days
1971	24 days
1972	19 days
1973	17 days
1974	15 days
1975	15 days
1976	28 days
1977	18 days
1978	14 days
1979	28 days
1980	24 days
1981	31 days
1982	18 days
1983	18 days
1984	16 days
1985	18 days
1986	22 days
1987	29 days
1988	37 days
1989	23 days
1990	16 days
1991	28 days
1992	17 days
1993	27 days
1994	20 days
1995	21 days
1996	21 days
1997	20 days
1998	24 days
1999	37 days
2000	18 days
2001	22 days
2002	22 days
2003	23 days
2004	16 days
2005	15 days
2006	20 days
2007	34 days
2008	14 days
2009	27 days
2010	26 days
2011	9 days
2012	25 days
2013	22 days
2014	22 days
2015	23 days
2016	22 days
2017	20 days
2018	17 days
2019	18 days
2020	20 days
2021	25 days
2022	25 days
2023	30 days
2024	30 days
2025	18 days
2026	17 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

66 years, 1955 to 2025

A day with at least 66.0 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 146.3 mm (5.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Dewitt: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	66.0 mm (2.6 in)
5 years	87.5 mm (3.4 in)
10 years	101.8 mm (4.0 in)
25 years	119.7 mm (4.7 in)
50 years	133.1 mm (5.2 in)
100 years	146.3 mm (5.8 in)	Longer than the 66 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, 66 years of values from 1955 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: 132.3 mm (5.2 in) in 1986; 127.8 mm (5.0 in) in 2013; 124.5 mm (4.9 in) in 2007.

Download the Data

Data for Dewitt standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Dewitt 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-15. Last revised 15 October 2026 (2026-10-15).