Walnut 4S Weather Records (USC00148549)

Record envelope, standing records and threshold days for Walnut 4S (USC00148549), Kansas, United States, with 125 years of record.

Key Facts for Walnut 4S

Walnut 4S (USC00148549) is a weather station in Kansas, United States at 37.54 latitude and -95.05 longitude, 284 m (930 ft) above sea level.
The station reports from 1902 to 2026, 125 years of record.
1,464 records set at Walnut 4S still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Walnut 4S set a daily record precipitation of 38.1 mm (1.5 in) on 5 November 2024.

About the Station

Location: Kansas, United States, 37.54 latitude, -95.05 longitude.
Elevation: 284 m (930 ft).
Period of record: 1902 to 2026, 125 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 Walnut 4S. 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 Walnut 4S, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	22.8 C (73.0 F)	-28.9 C (-20.0 F)	n/a	n/a
Feb	28.3 C (82.9 F)	-32.8 C (-27.0 F)	n/a	n/a
Mar	35.0 C (95.0 F)	-16.1 C (3.0 F)	n/a	n/a
Apr	32.2 C (90.0 F)	-8.3 C (17.1 F)	n/a	n/a
May	36.1 C (97.0 F)	-2.8 C (27.0 F)	n/a	n/a
Jun	41.1 C (106.0 F)	6.7 C (44.1 F)	n/a	n/a
Jul	42.2 C (108.0 F)	9.4 C (48.9 F)	n/a	n/a
Aug	43.9 C (111.0 F)	7.2 C (45.0 F)	n/a	n/a
Sep	40.6 C (105.1 F)	-1.1 C (30.0 F)	n/a	n/a
Oct	35.6 C (96.1 F)	-10.0 C (14.0 F)	n/a	n/a
Nov	29.4 C (84.9 F)	-13.3 C (8.1 F)	n/a	n/a
Dec	22.2 C (72.0 F)	-24.4 C (-11.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Walnut 4S still stand. 1911 holds the most, with 134.

Standing records at Walnut 4S by the year they were set
Year set	Standing records
1902	7
1903	111
1904	95
1905	87
1906	84
1907	100
1908	76
1909	91
1910	86
1911	134
1912	65
1913	114
1914	65
1915	61
1916	64
1917	102
1918	89
1919	20
1920	13

All-Time Record Progression

6 new records

6 all-time records were set at Walnut 4S between 22 June 1948 and 2 February 2011. Each dot is a new record.

When Walnut 4S set new all-time records
Date	Kind	Detail
1948-06-22	Record daily precipitation	Record daily precipitation 145.8 mm (5.7 in)
1986-10-03	Record daily precipitation	Record daily precipitation 192.0 mm (7.6 in)
1998-09-14	Record daily precipitation	Record daily precipitation 271.8 mm (10.7 in)
2006-12-01	Record daily snowfall	Record daily snowfall 31.2 cm (12.3 in)
2011-02-02	Record daily snowfall	Record daily snowfall 35.6 cm (14.0 in)
2011-02-02	Record snow depth	Record snow depth 35.6 cm (14.0 in)

Wettest Day of Each Month

Sep: 271.8 mm (10.7 in)

The wettest day on record for each calendar month at Walnut 4S. The most was 271.8 mm (10.7 in) on 14 September 1998.

Record daily precipitation for each month at Walnut 4S
Month	Record daily precipitation (mm)	Date
Jan	68.6 mm (2.7 in)	5 January 1946
Feb	104.4 mm (4.1 in)	3 February 1986
Mar	120.4 mm (4.7 in)	11 March 1974
Apr	138.4 mm (5.4 in)	8 April 1927
May	122.7 mm (4.8 in)	8 May 2002
Jun	145.8 mm (5.7 in)	22 June 1948
Jul	141.5 mm (5.6 in)	30 July 2013
Aug	132.3 mm (5.2 in)	9 August 1920
Sep	271.8 mm (10.7 in)	14 September 1998
Oct	192.0 mm (7.6 in)	3 October 1986
Nov	119.4 mm (4.7 in)	21 November 1979
Dec	57.2 mm (2.3 in)	27 December 2015

Period of Record Coverage

1902 to 1920

19 years of record at Walnut 4S, 1902 to 1920. 7 years have data for under 90 percent of days and are left out of rankings: 1902, 1912, 1914, 1915, 1918, 1919, 1920.

Days with data per year at Walnut 4S
Year	Days with data	Share of year	Complete
1902	27	7%	No
1903	345	95%	Yes
1904	355	97%	Yes
1905	358	98%	Yes
1906	333	91%	Yes
1907	349	96%	Yes
1908	356	97%	Yes
1909	352	96%	Yes
1910	362	99%	Yes
1911	349	96%	Yes
1912	296	81%	No
1913	341	93%	Yes
1914	268	73%	No
1915	280	77%	No
1916	340	93%	Yes
1917	337	92%	Yes
1918	214	59%	No
1919	129	35%	No
1920	83	23%	No

Latest Records

Latest records at Walnut 4S
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
5 November 2024	Walnut 4S, US	daily rain	38.1 mm (1.5 in)	1.3 mm (0.05 in)	2 years	10 of 100 (Routine)
12 February 2024	Walnut 4S, US	daily snowfall	8.4 cm (3.3 in)	3.3 cm (1.3 in)	109 years	46 of 100 (Notable)
5 November 2022	Walnut 4S, US	daily rain	36.8 mm (1.4 in)	11.7 mm (0.5 in)	100 years	47 of 100 (Notable)
15 September 2021	Walnut 4S, US	daily rain	59.2 mm (2.3 in)	10.7 mm (0.4 in)	106 years	44 of 100 (Notable)
1 August 2021	Walnut 4S, US	daily rain	28.2 mm (1.1 in)	0.5 mm (0.02 in)	118 years	40 of 100 (Notable)
16 July 2021	Walnut 4S, US	daily rain	122.2 mm (4.8 in)	56.7 mm (2.2 in)	63 years	59 of 100 (Notable)
26 June 2021	Walnut 4S, US	daily rain	114.8 mm (4.5 in)	64.0 mm (2.5 in)	39 years	56 of 100 (Notable)
17 February 2021	Walnut 4S, US	daily snow depth	22.9 cm (9.0 in)	2.6 cm (1.0 in)	116 years	42 of 100 (Notable)
17 February 2021	Walnut 4S, US	daily snowfall	10.2 cm (4.0 in)	1.3 cm (0.5 in)	34 years	22 of 100 (Routine)
15 February 2021	Walnut 4S, US	daily snowfall	17.8 cm (7.0 in)	4.8 cm (1.9 in)	118 years	49 of 100 (Notable)
29 October 2020	Walnut 4S, US	daily rain	45.7 mm (1.8 in)	10.9 mm (0.4 in)	7 years	18 of 100 (Routine)
26 May 2020	Walnut 4S, US	daily rain	65.3 mm (2.6 in)	23.1 mm (0.9 in)	105 years	54 of 100 (Notable)
29 December 2019	Walnut 4S, US	daily rain	41.4 mm (1.6 in)	19.8 mm (0.8 in)	64 years	48 of 100 (Notable)
18 December 2019	Walnut 4S, US	daily snow depth (Tie)	2.5 cm (1.0 in)	tie	2 years	2 of 100 (Routine)
17 December 2019	Walnut 4S, US	daily snow depth	2.5 cm (1.0 in)	2.5 cm (1.0 in)	97 years	20 of 100 (Routine)
22 July 2019	Walnut 4S, US	daily rain	80.0 mm (3.1 in)	33.3 mm (1.3 in)	57 years	45 of 100 (Notable)
16 June 2019	Walnut 4S, US	daily rain	80.8 mm (3.2 in)	31.8 mm (1.3 in)	113 years	57 of 100 (Notable)
21 May 2019	Walnut 4S, US	daily rain	102.4 mm (4.0 in)	65.3 mm (2.6 in)	116 years	80 of 100 (Exceptional)
14 November 2018	Walnut 4S, US	daily snow depth	2.5 cm (1.0 in)	2.5 cm (1.0 in)	69 years	20 of 100 (Routine)
13 November 2018	Walnut 4S, US	daily snow depth	7.6 cm (3.0 in)	7.6 cm (3.0 in)	107 years	20 of 100 (Routine)

Extremes by Year

1902 to 2026

Yearly extremes at Walnut 4S: 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)	1918	38.9 C (102.0 F)	19
Coldest night (TNn)	-32.8 C (-27.0 F)	1905	-20.0 C (-4.0 F)	19
Wettest day (Rx1day)	271.8 mm (10.7 in)	1998	76.5 mm (3.0 in)	125
Wettest five days (Rx5day)	421.3 mm (16.6 in)	1986	118.9 mm (4.7 in)	123
Longest dry spell (CDD)	89 days	1950	24 days	125

Hottest day (TXx)

The hottest day of the year at Walnut 4S, 1902 to 2026. The record is 43.9 C (111.0 F) in 1918, marked on the chart; the median year is 38.9 C (102.0 F).

Hottest day (TXx) at Walnut 4S by year
Year	Hottest day (TXx)
1902	16.1 C (61.0 F)
1903	37.8 C (100.0 F)
1904	35.0 C (95.0 F)
1905	36.1 C (97.0 F)
1906	36.1 C (97.0 F)
1907	41.1 C (106.0 F)
1908	37.8 C (100.0 F)
1909	43.3 C (109.9 F)
1910	41.7 C (107.1 F)
1911	42.2 C (108.0 F)
1912	37.8 C (100.0 F)
1913	41.1 C (106.0 F)
1914	38.9 C (102.0 F)
1915	33.9 C (93.0 F)
1916	40.0 C (104.0 F)
1917	40.0 C (104.0 F)
1918	43.9 C (111.0 F)
1919	38.9 C (102.0 F)
1920	30.6 C (87.1 F)
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
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1932	n/a
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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 Walnut 4S, 1902 to 2026. The record is -32.8 C (-27.0 F) in 1905, marked on the chart; the median year is -20.0 C (-4.0 F).

Coldest night (TNn) at Walnut 4S by year
Year	Coldest night (TNn)
1902	-15.6 C (3.9 F)
1903	-21.1 C (-6.0 F)
1904	-22.2 C (-8.0 F)
1905	-32.8 C (-27.0 F)
1906	-17.2 C (1.0 F)
1907	-16.1 C (3.0 F)
1908	-15.0 C (5.0 F)
1909	-20.6 C (-5.1 F)
1910	-20.0 C (-4.0 F)
1911	-22.2 C (-8.0 F)
1912	-28.3 C (-18.9 F)
1913	-20.0 C (-4.0 F)
1914	-20.0 C (-4.0 F)
1915	-13.3 C (8.1 F)
1916	-23.9 C (-11.0 F)
1917	-24.4 C (-11.9 F)
1918	-28.9 C (-20.0 F)
1919	-15.6 C (3.9 F)
1920	-16.7 C (1.9 F)
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
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2025	n/a
2026	n/a

Wettest day (Rx1day)

The wettest day of the year at Walnut 4S, 1902 to 2026. The record is 271.8 mm (10.7 in) in 1998, marked on the chart; the median year is 76.5 mm (3.0 in).

Wettest day (Rx1day) at Walnut 4S by year
Year	Wettest day (Rx1day)
1902	23.1 mm (0.9 in)
1903	86.1 mm (3.4 in)
1904	108.5 mm (4.3 in)
1905	122.2 mm (4.8 in)
1906	105.9 mm (4.2 in)
1907	84.6 mm (3.3 in)
1908	84.6 mm (3.3 in)
1909	40.6 mm (1.6 in)
1910	112.0 mm (4.4 in)
1911	126.7 mm (5.0 in)
1912	96.8 mm (3.8 in)
1913	52.8 mm (2.1 in)
1914	80.5 mm (3.2 in)
1915	61.0 mm (2.4 in)
1916	76.5 mm (3.0 in)
1917	68.8 mm (2.7 in)
1918	43.2 mm (1.7 in)
1919	50.0 mm (2.0 in)
1920	132.3 mm (5.2 in)
1921	116.1 mm (4.6 in)
1922	82.6 mm (3.3 in)
1923	81.5 mm (3.2 in)
1924	119.1 mm (4.7 in)
1925	81.5 mm (3.2 in)
1926	39.6 mm (1.6 in)
1927	138.4 mm (5.4 in)
1928	105.2 mm (4.1 in)
1929	66.3 mm (2.6 in)
1930	48.0 mm (1.9 in)
1931	78.7 mm (3.1 in)
1932	49.3 mm (1.9 in)
1933	55.9 mm (2.2 in)
1934	90.4 mm (3.6 in)
1935	63.2 mm (2.5 in)
1936	64.8 mm (2.6 in)
1937	72.4 mm (2.9 in)
1938	61.5 mm (2.4 in)
1939	64.3 mm (2.5 in)
1940	76.2 mm (3.0 in)
1941	104.1 mm (4.1 in)
1942	71.1 mm (2.8 in)
1943	75.2 mm (3.0 in)
1944	114.8 mm (4.5 in)
1945	91.4 mm (3.6 in)
1946	108.0 mm (4.3 in)
1947	77.5 mm (3.1 in)
1948	145.8 mm (5.7 in)
1949	99.1 mm (3.9 in)
1950	70.9 mm (2.8 in)
1951	55.9 mm (2.2 in)
1952	40.6 mm (1.6 in)
1953	58.7 mm (2.3 in)
1954	97.5 mm (3.8 in)
1955	64.0 mm (2.5 in)
1956	43.2 mm (1.7 in)
1957	54.1 mm (2.1 in)
1958	90.4 mm (3.6 in)
1959	74.9 mm (2.9 in)
1960	63.5 mm (2.5 in)
1961	118.6 mm (4.7 in)
1962	85.6 mm (3.4 in)
1963	50.8 mm (2.0 in)
1964	88.9 mm (3.5 in)
1965	61.0 mm (2.4 in)
1966	66.3 mm (2.6 in)
1967	78.0 mm (3.1 in)
1968	79.8 mm (3.1 in)
1969	68.8 mm (2.7 in)
1970	84.1 mm (3.3 in)
1971	78.7 mm (3.1 in)
1972	79.8 mm (3.1 in)
1973	53.3 mm (2.1 in)
1974	120.4 mm (4.7 in)
1975	50.8 mm (2.0 in)
1976	71.1 mm (2.8 in)
1977	120.9 mm (4.8 in)
1978	50.8 mm (2.0 in)
1979	119.4 mm (4.7 in)
1980	8.9 mm (0.35 in)
1981	74.4 mm (2.9 in)
1982	77.5 mm (3.1 in)
1983	132.3 mm (5.2 in)
1984	68.8 mm (2.7 in)
1985	87.4 mm (3.4 in)
1986	192.0 mm (7.6 in)
1987	52.3 mm (2.1 in)
1988	121.9 mm (4.8 in)
1989	98.8 mm (3.9 in)
1990	110.2 mm (4.3 in)
1991	46.7 mm (1.8 in)
1992	75.9 mm (3.0 in)
1993	157.7 mm (6.2 in)
1994	102.1 mm (4.0 in)
1995	101.1 mm (4.0 in)
1996	85.3 mm (3.4 in)
1997	69.3 mm (2.7 in)
1998	271.8 mm (10.7 in)
1999	62.5 mm (2.5 in)
2000	67.8 mm (2.7 in)
2001	76.2 mm (3.0 in)
2002	122.7 mm (4.8 in)
2003	55.6 mm (2.2 in)
2004	66.3 mm (2.6 in)
2005	64.3 mm (2.5 in)
2006	63.8 mm (2.5 in)
2007	64.5 mm (2.5 in)
2008	91.7 mm (3.6 in)
2009	110.7 mm (4.4 in)
2010	99.8 mm (3.9 in)
2011	69.1 mm (2.7 in)
2012	90.9 mm (3.6 in)
2013	141.5 mm (5.6 in)
2014	68.8 mm (2.7 in)
2015	80.5 mm (3.2 in)
2016	65.3 mm (2.6 in)
2017	130.0 mm (5.1 in)
2018	68.3 mm (2.7 in)
2019	102.4 mm (4.0 in)
2020	65.3 mm (2.6 in)
2021	122.2 mm (4.8 in)
2022	66.8 mm (2.6 in)
2023	34.8 mm (1.4 in)
2024	64.8 mm (2.6 in)
2025	0.0 mm (0.00 in)
2026	0.0 mm (0.00 in)

Wettest five days (Rx5day)

The wettest five days of the year at Walnut 4S, 1902 to 2026. The record is 421.3 mm (16.6 in) in 1986, marked on the chart; the median year is 118.9 mm (4.7 in).

Wettest five days (Rx5day) at Walnut 4S by year
Year	Wettest five days (Rx5day)
1902	38.4 mm (1.5 in)
1903	110.8 mm (4.4 in)
1904	190.5 mm (7.5 in)
1905	143.3 mm (5.6 in)
1906	138.9 mm (5.5 in)
1907	126.3 mm (5.0 in)
1908	203.9 mm (8.0 in)
1909	50.0 mm (2.0 in)
1910	196.8 mm (7.7 in)
1911	145.5 mm (5.7 in)
1912	147.8 mm (5.8 in)
1913	89.6 mm (3.5 in)
1914	117.1 mm (4.6 in)
1915	97.7 mm (3.8 in)
1916	107.8 mm (4.2 in)
1917	85.3 mm (3.4 in)
1918	53.1 mm (2.1 in)
1919	92.9 mm (3.7 in)
1920	177.7 mm (7.0 in)
1921	147.8 mm (5.8 in)
1922	141.6 mm (5.6 in)
1923	134.4 mm (5.3 in)
1924	127.8 mm (5.0 in)
1925	141.2 mm (5.6 in)
1926	108.3 mm (4.3 in)
1927	209.5 mm (8.2 in)
1928	184.5 mm (7.3 in)
1929	113.6 mm (4.5 in)
1930	101.9 mm (4.0 in)
1931	90.7 mm (3.6 in)
1932	95.5 mm (3.8 in)
1933	96.6 mm (3.8 in)
1934	110.6 mm (4.4 in)
1935	151.4 mm (6.0 in)
1936	90.9 mm (3.6 in)
1937	105.1 mm (4.1 in)
1938	104.0 mm (4.1 in)
1939	66.0 mm (2.6 in)
1940	85.4 mm (3.4 in)
1941	166.1 mm (6.5 in)
1942	100.3 mm (3.9 in)
1943	187.2 mm (7.4 in)
1944	162.6 mm (6.4 in)
1945	176.9 mm (7.0 in)
1946	118.1 mm (4.6 in)
1947	91.2 mm (3.6 in)
1948	215.7 mm (8.5 in)
1949	138.3 mm (5.4 in)
1950	106.5 mm (4.2 in)
1951	133.6 mm (5.3 in)
1952	62.7 mm (2.5 in)
1953	59.2 mm (2.3 in)
1954	131.1 mm (5.2 in)
1955	101.9 mm (4.0 in)
1956	54.1 mm (2.1 in)
1957	66.6 mm (2.6 in)
1958	157.9 mm (6.2 in)
1959	161.1 mm (6.3 in)
1960	77.7 mm (3.1 in)
1961	211.6 mm (8.3 in)
1962	112.5 mm (4.4 in)
1963	65.8 mm (2.6 in)
1964	153.6 mm (6.0 in)
1965	110.1 mm (4.3 in)
1966	153.9 mm (6.1 in)
1967	131.9 mm (5.2 in)
1968	104.9 mm (4.1 in)
1969	98.5 mm (3.9 in)
1970	108.1 mm (4.3 in)
1971	123.1 mm (4.8 in)
1972	87.6 mm (3.4 in)
1973	85.9 mm (3.4 in)
1974	201.2 mm (7.9 in)
1975	67.3 mm (2.6 in)
1976	118.7 mm (4.7 in)
1977	239.8 mm (9.4 in)
1978	69.7 mm (2.7 in)
1979	127.0 mm (5.0 in)
1980	17.0 mm (0.7 in)
1981	145.8 mm (5.7 in)
1982	79.0 mm (3.1 in)
1983	201.9 mm (7.9 in)
1984	123.0 mm (4.8 in)
1985	150.9 mm (5.9 in)
1986	421.3 mm (16.6 in)
1987	90.2 mm (3.6 in)
1988	193.5 mm (7.6 in)
1989	122.1 mm (4.8 in)
1990	159.8 mm (6.3 in)
1991	65.3 mm (2.6 in)
1992	131.8 mm (5.2 in)
1993	264.1 mm (10.4 in)
1994	183.9 mm (7.2 in)
1995	162.3 mm (6.4 in)
1996	113.6 mm (4.5 in)
1997	106.4 mm (4.2 in)
1998	295.2 mm (11.6 in)
1999	89.7 mm (3.5 in)
2000	130.0 mm (5.1 in)
2001	78.0 mm (3.1 in)
2002	159.6 mm (6.3 in)
2003	151.6 mm (6.0 in)
2004	127.0 mm (5.0 in)
2005	104.4 mm (4.1 in)
2006	90.0 mm (3.5 in)
2007	70.6 mm (2.8 in)
2008	154.5 mm (6.1 in)
2009	184.6 mm (7.3 in)
2010	152.4 mm (6.0 in)
2011	81.3 mm (3.2 in)
2012	145.4 mm (5.7 in)
2013	214.4 mm (8.4 in)
2014	103.8 mm (4.1 in)
2015	110.0 mm (4.3 in)
2016	118.9 mm (4.7 in)
2017	168.4 mm (6.6 in)
2018	68.3 mm (2.7 in)
2019	215.1 mm (8.5 in)
2020	89.9 mm (3.5 in)
2021	124.5 mm (4.9 in)
2022	68.6 mm (2.7 in)
2023	99.3 mm (3.9 in)
2024	121.7 mm (4.8 in)
2025	n/a
2026	n/a

Longest dry spell (CDD)

The longest dry spell of the year at Walnut 4S, 1902 to 2026. The record is 89 days in 1950, marked on the chart; the median year is 24 days.

Longest dry spell (CDD) at Walnut 4S by year
Year	Longest dry spell (CDD)
1902	11 days
1903	20 days
1904	31 days
1905	25 days
1906	19 days
1907	24 days
1908	27 days
1909	24 days
1910	29 days
1911	18 days
1912	32 days
1913	29 days
1914	41 days
1915	24 days
1916	21 days
1917	49 days
1918	30 days
1919	16 days
1920	20 days
1921	26 days
1922	26 days
1923	29 days
1924	24 days
1925	18 days
1926	21 days
1927	23 days
1928	24 days
1929	19 days
1930	29 days
1931	21 days
1932	24 days
1933	30 days
1934	41 days
1935	20 days
1936	48 days
1937	24 days
1938	23 days
1939	24 days
1940	19 days
1941	21 days
1942	24 days
1943	25 days
1944	24 days
1945	29 days
1946	25 days
1947	34 days
1948	24 days
1949	40 days
1950	89 days
1951	28 days
1952	48 days
1953	17 days
1954	35 days
1955	55 days
1956	34 days
1957	24 days
1958	30 days
1959	27 days
1960	20 days
1961	36 days
1962	28 days
1963	39 days
1964	20 days
1965	51 days
1966	30 days
1967	26 days
1968	21 days
1969	23 days
1970	21 days
1971	30 days
1972	29 days
1973	18 days
1974	21 days
1975	17 days
1976	36 days
1977	23 days
1978	22 days
1979	48 days
1980	15 days
1981	21 days
1982	22 days
1983	26 days
1984	21 days
1985	20 days
1986	23 days
1987	18 days
1988	22 days
1989	38 days
1990	27 days
1991	37 days
1992	17 days
1993	24 days
1994	23 days
1995	35 days
1996	24 days
1997	19 days
1998	15 days
1999	30 days
2000	39 days
2001	16 days
2002	18 days
2003	17 days
2004	27 days
2005	25 days
2006	33 days
2007	18 days
2008	24 days
2009	33 days
2010	34 days
2011	32 days
2012	34 days
2013	33 days
2014	31 days
2015	25 days
2016	25 days
2017	25 days
2018	26 days
2019	15 days
2020	20 days
2021	17 days
2022	19 days
2023	22 days
2024	16 days
2025	1 day
2026	1 day

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

99 years, 1903 to 2019

A day with at least 78.4 mm (3.1 in) of rain is expected about once in 2 years. A day with at least 186.7 mm (7.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Walnut 4S: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	78.4 mm (3.1 in)
5 years	104.8 mm (4.1 in)
10 years	123.3 mm (4.9 in)
25 years	147.8 mm (5.8 in)
50 years	166.9 mm (6.6 in)
100 years	186.7 mm (7.4 in)	Longer than the 99 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, 99 years of values from 1903 to 2019.

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: 271.8 mm (10.7 in) in 1998; 157.7 mm (6.2 in) in 1993; 145.8 mm (5.7 in) in 1948.

Download the Data

Data for Walnut 4S standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Walnut 4S 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).