Wapello Weather Records (USC00138668)

Record envelope, standing records and threshold days for Wapello (USC00138668), Iowa, United States, with 119 years of record.

Key Facts for Wapello

Wapello (USC00138668) is a weather station in Iowa, United States at 41.18 latitude and -91.19 longitude, 177 m (580 ft) above sea level.
The station reports from 1898 to 2016, 119 years of record.
1,464 records set at Wapello still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Wapello set a daily record precipitation of 81.3 mm (3.2 in) on 8 September 2016.

About the Station

Location: Iowa, United States, 41.18 latitude, -91.19 longitude.
Elevation: 177 m (580 ft).
Period of record: 1898 to 2016, 119 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 Wapello. 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 Wapello, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	17.2 C (63.0 F)	-27.8 C (-18.0 F)	n/a	n/a
Feb	17.8 C (64.0 F)	-30.0 C (-22.0 F)	n/a	n/a
Mar	29.4 C (84.9 F)	-22.8 C (-9.0 F)	n/a	n/a
Apr	32.8 C (91.0 F)	-11.7 C (10.9 F)	n/a	n/a
May	33.3 C (91.9 F)	-1.7 C (28.9 F)	n/a	n/a
Jun	41.1 C (106.0 F)	5.0 C (41.0 F)	n/a	n/a
Jul	43.9 C (111.0 F)	8.9 C (48.0 F)	n/a	n/a
Aug	39.4 C (102.9 F)	9.4 C (48.9 F)	n/a	n/a
Sep	37.8 C (100.0 F)	-5.0 C (23.0 F)	n/a	n/a
Oct	31.1 C (88.0 F)	-5.0 C (23.0 F)	n/a	n/a
Nov	23.9 C (75.0 F)	-18.9 C (-2.0 F)	n/a	n/a
Dec	15.6 C (60.1 F)	-24.4 C (-11.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Wapello still stand. 1899 holds the most, with 143.

All-Time Record Progression

6 new records

6 all-time records were set at Wapello between 14 January 1979 and 3 February 2011. Each dot is a new record.

When Wapello set new all-time records
Date	Kind	Detail
1979-01-14	Record snow depth	Record snow depth 53.3 cm (21.0 in)
1979-01-23	Record snow depth	Record snow depth 55.9 cm (22.0 in)
2000-12-30	Record snow depth	Record snow depth 61.0 cm (24.0 in)
2000-12-31	Record snow depth	Record snow depth 66.0 cm (26.0 in)
2008-09-13	Record daily precipitation	Record daily precipitation 139.7 mm (5.5 in)
2011-02-03	Record daily snowfall	Record daily snowfall 33.0 cm (13.0 in)

Wettest Day of Each Month

Sep: 139.7 mm (5.5 in)

The wettest day on record for each calendar month at Wapello. The most was 139.7 mm (5.5 in) on 13 September 2008.

Record daily precipitation for each month at Wapello
Month	Record daily precipitation (mm)	Date
Jan	52.3 mm (2.1 in)	29 January 2006
Feb	52.6 mm (2.1 in)	21 February 1997
Mar	94.7 mm (3.7 in)	25 March 1954
Apr	97.8 mm (3.9 in)	24 April 1976
May	85.6 mm (3.4 in)	1 May 2003
Jun	103.6 mm (4.1 in)	22 June 2007
Jul	120.1 mm (4.7 in)	5 July 1948
Aug	131.1 mm (5.2 in)	16 August 1898
Sep	139.7 mm (5.5 in)	13 September 2008
Oct	74.9 mm (2.9 in)	13 October 1966
Nov	48.8 mm (1.9 in)	11 November 1995
Dec	66.8 mm (2.6 in)	27 December 1942

Period of Record Coverage

1898 to 1913

16 years of record at Wapello, 1898 to 1913. 5 years have data for under 90 percent of days and are left out of rankings: 1898, 1902, 1907, 1908, 1913.

Days with data per year at Wapello
Year	Days with data	Share of year	Complete
1898	179	49%	No
1899	354	97%	Yes
1900	350	96%	Yes
1901	346	95%	Yes
1902	318	87%	No
1903	353	97%	Yes
1904	347	95%	Yes
1905	333	91%	Yes
1906	333	91%	Yes
1907	327	90%	No
1908	308	84%	No
1909	351	96%	Yes
1910	362	99%	Yes
1911	337	92%	Yes
1912	348	95%	Yes
1913	84	23%	No

Latest Records

Latest records at Wapello
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
8 September 2016	Wapello, US	daily rain	81.3 mm (3.2 in)	41.9 mm (1.6 in)	27 years	43 of 100 (Notable)
12 August 2016	Wapello, US	daily rain	69.9 mm (2.8 in)	15.3 mm (0.6 in)	67 years	38 of 100 (Notable)
14 October 2014	Wapello, US	daily rain	43.7 mm (1.7 in)	23.9 mm (0.9 in)	1 year	30 of 100 (Routine)
3 October 2014	Wapello, US	daily rain	43.9 mm (1.7 in)	12.1 mm (0.5 in)	72 years	41 of 100 (Notable)
1 July 2014	Wapello, US	daily rain	94.5 mm (3.7 in)	11.4 mm (0.4 in)	72 years	38 of 100 (Notable)
15 February 2014	Wapello, US	daily snow depth (Tie)	30.5 cm (12.0 in)	tie	11 years	3 of 100 (Routine)
14 February 2014	Wapello, US	daily snow depth	25.4 cm (10.0 in)	2.5 cm (1.0 in)	78 years	36 of 100 (Notable)
9 February 2014	Wapello, US	daily snowfall (Tie)	7.6 cm (3.0 in)	tie	108 years	10 of 100 (Routine)
5 February 2014	Wapello, US	daily snowfall	17.8 cm (7.0 in)	9.4 cm (3.7 in)	59 years	45 of 100 (Notable)
1 February 2014	Wapello, US	daily snowfall	12.7 cm (5.0 in)	5.1 cm (2.0 in)	58 years	36 of 100 (Notable)
1 February 2014	Wapello, US	daily rain	8.9 mm (0.35 in)	2.5 mm (0.10 in)	75 years	20 of 100 (Routine)
22 December 2013	Wapello, US	daily snowfall	12.7 cm (5.0 in)	5.8 cm (2.3 in)	60 years	42 of 100 (Notable)
15 December 2013	Wapello, US	daily snowfall (Tie)	10.2 cm (4.0 in)	tie	78 years	8 of 100 (Routine)
6 November 2013	Wapello, US	daily rain	17.3 mm (0.7 in)	2.6 mm (0.10 in)	68 years	20 of 100 (Routine)
27 May 2013	Wapello, US	daily rain	61.0 mm (2.4 in)	22.1 mm (0.9 in)	40 years	40 of 100 (Notable)
4 May 2013	Wapello, US	daily rain	63.2 mm (2.5 in)	14.2 mm (0.6 in)	0 years	21 of 100 (Routine)
24 March 2013	Wapello, US	daily snowfall	5.1 cm (2.0 in)	2.6 cm (1.0 in)	4 years	15 of 100 (Routine)
10 March 2013	Wapello, US	daily rain	30.7 mm (1.2 in)	6.6 mm (0.26 in)	112 years	46 of 100 (Notable)
6 March 2013	Wapello, US	daily snowfall	10.2 cm (4.0 in)	2.6 cm (1.0 in)	64 years	33 of 100 (Routine)
28 February 2013	Wapello, US	daily snowfall	10.2 cm (4.0 in)	0.5 cm (0.2 in)	44 years	23 of 100 (Routine)

Extremes by Year

1898 to 2016

Yearly extremes at Wapello: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	43.9 C (111.0 F)	1901	33.9 C (93.0 F)	16
Coldest night (TNn)	-30.0 C (-22.0 F)	1899	-23.3 C (-10.0 F)	16
Wettest day (Rx1day)	139.7 mm (5.5 in)	2008	65.9 mm (2.6 in)	100
Wettest five days (Rx5day)	223.2 mm (8.8 in)	1965	96.6 mm (3.8 in)	99
Longest dry spell (CDD)	55 days	1952	23 days	100

Hottest day (TXx)

The hottest day of the year at Wapello, 1898 to 2016. The record is 43.9 C (111.0 F) in 1901, marked on the chart; the median year is 33.9 C (93.0 F).

Hottest day (TXx) at Wapello by year
Year	Hottest day (TXx)
1898	36.7 C (98.1 F)
1899	37.8 C (100.0 F)
1900	39.4 C (102.9 F)
1901	43.9 C (111.0 F)
1902	32.2 C (90.0 F)
1903	35.6 C (96.1 F)
1904	32.8 C (91.0 F)
1905	33.9 C (93.0 F)
1906	33.9 C (93.0 F)
1907	31.1 C (88.0 F)
1908	32.2 C (90.0 F)
1909	32.8 C (91.0 F)
1910	33.9 C (93.0 F)
1911	39.4 C (102.9 F)
1912	35.6 C (96.1 F)
1913	20.6 C (69.1 F)
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
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	n/a
1980	n/a
1981	n/a
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
2016	n/a

Coldest night (TNn)

The coldest night of the year at Wapello, 1898 to 2016. The record is -30.0 C (-22.0 F) in 1899, marked on the chart; the median year is -23.3 C (-10.0 F).

Coldest night (TNn) at Wapello by year
Year	Coldest night (TNn)
1898	-20.6 C (-5.1 F)
1899	-30.0 C (-22.0 F)
1900	-21.1 C (-6.0 F)
1901	-22.8 C (-9.0 F)
1902	-24.4 C (-11.9 F)
1903	-24.4 C (-11.9 F)
1904	-24.4 C (-11.9 F)
1905	-30.0 C (-22.0 F)
1906	-17.8 C (0.0 F)
1907	-18.9 C (-2.0 F)
1908	-17.8 C (0.0 F)
1909	-23.9 C (-11.0 F)
1910	-25.6 C (-14.1 F)
1911	-22.2 C (-8.0 F)
1912	-27.8 C (-18.0 F)
1913	-22.8 C (-9.0 F)
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
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	n/a
1980	n/a
1981	n/a
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
2016	n/a

Wettest day (Rx1day)

The wettest day of the year at Wapello, 1898 to 2016. The record is 139.7 mm (5.5 in) in 2008, marked on the chart; the median year is 65.9 mm (2.6 in).

Wettest day (Rx1day) at Wapello by year
Year	Wettest day (Rx1day)
1898	131.1 mm (5.2 in)
1899	31.8 mm (1.3 in)
1900	65.8 mm (2.6 in)
1901	32.5 mm (1.3 in)
1902	78.0 mm (3.1 in)
1903	116.8 mm (4.6 in)
1904	63.8 mm (2.5 in)
1905	50.8 mm (2.0 in)
1906	59.4 mm (2.3 in)
1907	57.2 mm (2.3 in)
1908	50.0 mm (2.0 in)
1909	46.7 mm (1.8 in)
1910	59.2 mm (2.3 in)
1911	133.4 mm (5.3 in)
1912	62.0 mm (2.4 in)
1913	25.7 mm (1.0 in)
1932	67.6 mm (2.7 in)
1933	57.7 mm (2.3 in)
1934	70.1 mm (2.8 in)
1935	69.6 mm (2.7 in)
1936	47.0 mm (1.9 in)
1937	58.9 mm (2.3 in)
1938	66.0 mm (2.6 in)
1939	86.4 mm (3.4 in)
1940	53.6 mm (2.1 in)
1941	83.1 mm (3.3 in)
1942	66.8 mm (2.6 in)
1943	118.1 mm (4.6 in)
1944	49.5 mm (1.9 in)
1945	67.1 mm (2.6 in)
1946	57.9 mm (2.3 in)
1947	120.7 mm (4.8 in)
1948	120.1 mm (4.7 in)
1949	54.6 mm (2.1 in)
1950	69.1 mm (2.7 in)
1951	79.8 mm (3.1 in)
1952	69.1 mm (2.7 in)
1953	36.6 mm (1.4 in)
1954	94.7 mm (3.7 in)
1955	55.6 mm (2.2 in)
1956	41.7 mm (1.6 in)
1957	84.6 mm (3.3 in)
1958	86.4 mm (3.4 in)
1959	61.2 mm (2.4 in)
1960	51.6 mm (2.0 in)
1961	93.2 mm (3.7 in)
1962	76.5 mm (3.0 in)
1963	57.4 mm (2.3 in)
1964	62.5 mm (2.5 in)
1965	123.4 mm (4.9 in)
1966	74.9 mm (2.9 in)
1967	46.2 mm (1.8 in)
1968	33.0 mm (1.3 in)
1969	97.8 mm (3.9 in)
1970	51.6 mm (2.0 in)
1971	68.1 mm (2.7 in)
1972	73.7 mm (2.9 in)
1973	65.5 mm (2.6 in)
1974	39.1 mm (1.5 in)
1975	50.8 mm (2.0 in)
1976	97.8 mm (3.9 in)
1977	58.4 mm (2.3 in)
1978	54.9 mm (2.2 in)
1979	43.9 mm (1.7 in)
1980	64.0 mm (2.5 in)
1981	47.5 mm (1.9 in)
1982	66.5 mm (2.6 in)
1983	78.5 mm (3.1 in)
1984	67.3 mm (2.6 in)
1985	70.9 mm (2.8 in)
1986	61.0 mm (2.4 in)
1987	68.1 mm (2.7 in)
1988	49.8 mm (2.0 in)
1989	57.9 mm (2.3 in)
1990	92.7 mm (3.6 in)
1991	38.9 mm (1.5 in)
1992	66.5 mm (2.6 in)
1993	107.4 mm (4.2 in)
1994	34.5 mm (1.4 in)
1995	67.6 mm (2.7 in)
1996	51.6 mm (2.0 in)
1997	55.6 mm (2.2 in)
1998	71.6 mm (2.8 in)
1999	86.1 mm (3.4 in)
2000	56.9 mm (2.2 in)
2001	62.0 mm (2.4 in)
2002	79.5 mm (3.1 in)
2003	85.6 mm (3.4 in)
2004	72.6 mm (2.9 in)
2005	38.1 mm (1.5 in)
2006	70.9 mm (2.8 in)
2007	103.6 mm (4.1 in)
2008	139.7 mm (5.5 in)
2009	72.6 mm (2.9 in)
2010	65.8 mm (2.6 in)
2011	54.4 mm (2.1 in)
2012	93.7 mm (3.7 in)
2013	63.2 mm (2.5 in)
2014	94.5 mm (3.7 in)
2016	83.8 mm (3.3 in)

Wettest five days (Rx5day)

The wettest five days of the year at Wapello, 1898 to 2016. The record is 223.2 mm (8.8 in) in 1965, marked on the chart; the median year is 96.6 mm (3.8 in).

Wettest five days (Rx5day) at Wapello by year
Year	Wettest five days (Rx5day)
1898	148.9 mm (5.9 in)
1899	50.8 mm (2.0 in)
1900	125.7 mm (4.9 in)
1901	47.8 mm (1.9 in)
1902	113.8 mm (4.5 in)
1903	124.7 mm (4.9 in)
1904	84.2 mm (3.3 in)
1905	64.8 mm (2.6 in)
1906	79.8 mm (3.1 in)
1907	100.7 mm (4.0 in)
1908	100.2 mm (3.9 in)
1909	74.5 mm (2.9 in)
1910	73.7 mm (2.9 in)
1911	72.2 mm (2.8 in)
1912	66.6 mm (2.6 in)
1913	12.9 mm (0.5 in)
1932	94.6 mm (3.7 in)
1933	87.7 mm (3.5 in)
1934	99.8 mm (3.9 in)
1935	91.7 mm (3.6 in)
1936	109.3 mm (4.3 in)
1937	96.8 mm (3.8 in)
1938	116.8 mm (4.6 in)
1939	102.6 mm (4.0 in)
1940	89.5 mm (3.5 in)
1941	128.8 mm (5.1 in)
1942	72.2 mm (2.8 in)
1943	127.8 mm (5.0 in)
1944	76.7 mm (3.0 in)
1945	82.2 mm (3.2 in)
1946	88.4 mm (3.5 in)
1947	62.9 mm (2.5 in)
1948	120.1 mm (4.7 in)
1949	66.0 mm (2.6 in)
1950	116.0 mm (4.6 in)
1951	108.7 mm (4.3 in)
1952	82.3 mm (3.2 in)
1953	43.0 mm (1.7 in)
1954	97.2 mm (3.8 in)
1955	70.0 mm (2.8 in)
1956	67.1 mm (2.6 in)
1957	91.7 mm (3.6 in)
1958	167.7 mm (6.6 in)
1959	131.0 mm (5.2 in)
1960	86.2 mm (3.4 in)
1961	179.1 mm (7.1 in)
1962	87.4 mm (3.4 in)
1963	72.1 mm (2.8 in)
1964	101.7 mm (4.0 in)
1965	223.2 mm (8.8 in)
1966	99.0 mm (3.9 in)
1967	71.4 mm (2.8 in)
1968	75.0 mm (3.0 in)
1969	116.1 mm (4.6 in)
1970	88.5 mm (3.5 in)
1971	74.5 mm (2.9 in)
1972	82.6 mm (3.3 in)
1973	123.5 mm (4.9 in)
1974	60.7 mm (2.4 in)
1975	66.8 mm (2.6 in)
1976	129.0 mm (5.1 in)
1977	141.8 mm (5.6 in)
1978	78.0 mm (3.1 in)
1979	63.0 mm (2.5 in)
1980	102.8 mm (4.0 in)
1981	96.5 mm (3.8 in)
1982	137.3 mm (5.4 in)
1983	122.2 mm (4.8 in)
1984	123.7 mm (4.9 in)
1985	110.8 mm (4.4 in)
1986	96.6 mm (3.8 in)
1987	78.5 mm (3.1 in)
1988	60.7 mm (2.4 in)
1989	151.2 mm (6.0 in)
1990	161.8 mm (6.4 in)
1991	72.5 mm (2.9 in)
1992	99.3 mm (3.9 in)
1993	136.4 mm (5.4 in)
1994	40.3 mm (1.6 in)
1995	106.9 mm (4.2 in)
1996	105.4 mm (4.1 in)
1997	65.0 mm (2.6 in)
1998	105.2 mm (4.1 in)
1999	108.5 mm (4.3 in)
2000	82.8 mm (3.3 in)
2001	85.1 mm (3.4 in)
2002	99.8 mm (3.9 in)
2003	114.3 mm (4.5 in)
2004	97.6 mm (3.8 in)
2005	68.1 mm (2.7 in)
2006	93.7 mm (3.7 in)
2007	141.9 mm (5.6 in)
2008	183.1 mm (7.2 in)
2009	116.8 mm (4.6 in)
2010	83.3 mm (3.3 in)
2011	n/a
2012	70.4 mm (2.8 in)
2013	122.2 mm (4.8 in)
2014	101.9 mm (4.0 in)
2016	107.9 mm (4.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Wapello, 1898 to 2016. The record is 55 days in 1952, marked on the chart; the median year is 23 days.

Longest dry spell (CDD) at Wapello by year
Year	Longest dry spell (CDD)
1898	20 days
1899	39 days
1900	20 days
1901	29 days
1902	32 days
1903	25 days
1904	30 days
1905	24 days
1906	21 days
1907	29 days
1908	25 days
1909	15 days
1910	29 days
1911	18 days
1912	54 days
1913	27 days
1932	24 days
1933	30 days
1934	36 days
1935	17 days
1936	20 days
1937	20 days
1938	24 days
1939	19 days
1940	25 days
1941	19 days
1942	28 days
1943	26 days
1944	27 days
1945	17 days
1946	20 days
1947	11 days
1948	32 days
1949	22 days
1950	31 days
1951	17 days
1952	55 days
1953	23 days
1954	23 days
1955	15 days
1956	34 days
1957	28 days
1958	26 days
1959	20 days
1960	14 days
1961	15 days
1962	19 days
1963	25 days
1964	20 days
1965	20 days
1966	26 days
1967	28 days
1968	29 days
1969	32 days
1970	20 days
1971	31 days
1972	15 days
1973	19 days
1974	25 days
1975	15 days
1976	42 days
1977	23 days
1978	21 days
1979	35 days
1980	16 days
1981	31 days
1982	18 days
1983	22 days
1984	16 days
1985	11 days
1986	23 days
1987	28 days
1988	37 days
1989	21 days
1990	16 days
1991	23 days
1992	17 days
1993	24 days
1994	23 days
1995	19 days
1996	22 days
1997	21 days
1998	23 days
1999	37 days
2000	20 days
2001	13 days
2002	25 days
2003	22 days
2004	22 days
2005	16 days
2006	19 days
2007	26 days
2008	16 days
2009	24 days
2010	20 days
2011	2 days
2012	8 days
2013	35 days
2014	17 days
2016	12 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

77 years, 1899 to 2013

A day with at least 64.6 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 138.0 mm (5.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Wapello: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	64.6 mm (2.5 in)
5 years	84.6 mm (3.3 in)
10 years	97.7 mm (3.8 in)
25 years	114.1 mm (4.5 in)
50 years	126.1 mm (5.0 in)
100 years	138.0 mm (5.4 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 1899 to 2013.

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: 139.7 mm (5.5 in) in 2008; 123.4 mm (4.9 in) in 1965; 120.1 mm (4.7 in) in 1948.

Download the Data

Data for Wapello standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Wapello 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).