Weather Records on 20 September 1973

569 weather records were set or tied worldwide on 20 September 1973. Highest significance: Lake Spaulding, US.

Key Facts for 20 September 1973

On 20 September 1973, 569 weather records were set or tied at long-record stations worldwide.
91 were record highs and 217 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 5 monthly and 564 daily.
Lake Spaulding set a daily record precipitation of 56.1 mm (2.2 in) on 20 September 1973.
Across 156 earlier years (1812 to 2026) the same calendar date averaged 441 records.

Record Map

569 stations

569 station records on 20 September 1973 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 September 1973: highest significance records shown on the map
Station	Country	Type	Value	Significance
Lake Spaulding	United States	Record daily precipitation	56.1 mm (2.2 in)	59 of 100 (Notable)
Wisley	United Kingdom	Record daily precipitation	55.1 mm (2.2 in)	58 of 100 (Notable)
Bowman Dam	United States	Record daily precipitation	45.7 mm (1.8 in)	50 of 100 (Notable)
Beedeville 4 NE	United States	Record daily precipitation	91.2 mm (3.6 in)	49 of 100 (Notable)
Iowa Hill	United States	Record daily precipitation	33.5 mm (1.3 in)	48 of 100 (Notable)
Weaverville	United States	Record daily precipitation	27.9 mm (1.1 in)	47 of 100 (Notable)
Republic	United States	Record daily precipitation	34.8 mm (1.4 in)	46 of 100 (Notable)
Gernsheim-Allmendfeld	Germany	Record daily precipitation	26.7 mm (1.1 in)	44 of 100 (Notable)
Clatskanie	United States	Record daily precipitation	44.5 mm (1.8 in)	44 of 100 (Notable)
Packwood	United States	Record daily precipitation	44.5 mm (1.8 in)	44 of 100 (Notable)
Eastbourne	United Kingdom	Record daily precipitation	38.7 mm (1.5 in)	43 of 100 (Notable)
Blue Canyon Nyack AP	United States	Record daily precipitation	44.2 mm (1.7 in)	43 of 100 (Notable)
Tiirikoja	Estonia	Record daily precipitation	28.2 mm (1.1 in)	40 of 100 (Notable)
Pjalica	Russia	Record daily precipitation	32.0 mm (1.3 in)	40 of 100 (Notable)
Forest Glen	United States	Record daily precipitation	35.3 mm (1.4 in)	40 of 100 (Notable)
South Slocan	Canada	Record daily precipitation	32.0 mm (1.3 in)	38 of 100 (Notable)
Brush Creek Rs	United States	Record daily precipitation	43.7 mm (1.7 in)	37 of 100 (Notable)
Talladega	United States	Record low minimum temperature	5.0 C (41.0 F)	36 of 100 (Notable)
Alderpoint	United States	Record daily precipitation	32.5 mm (1.3 in)	36 of 100 (Notable)
Gold Run 4 SW	United States	Record daily precipitation	43.9 mm (1.7 in)	36 of 100 (Notable)
Timber	United States	Record daily precipitation	38.9 mm (1.5 in)	36 of 100 (Notable)
Cnory	Georgia	Record daily precipitation	27.7 mm (1.1 in)	35 of 100 (Notable)
McCloud	United States	Record daily precipitation	35.8 mm (1.4 in)	34 of 100 (Routine)
Skaggs Spgs Las Lomas	United States	Record daily precipitation	36.8 mm (1.4 in)	34 of 100 (Routine)
Rainer Ohanapecosh	United States	Record daily precipitation	48.0 mm (1.9 in)	33 of 100 (Routine)
Haileybury	Canada	Record low minimum temperature	-1.7 C (28.9 F)	32 of 100 (Routine)
The Downs	South Africa	Record daily precipitation	35.0 mm (1.4 in)	32 of 100 (Routine)
Santa Barbara	United States	Record low maximum temperature	18.9 C (66.0 F)	32 of 100 (Routine)
Portage Wwtp	United States	Record low minimum temperature	-1.7 C (28.9 F)	32 of 100 (Routine)
Davidson	Canada	Record daily precipitation	25.4 mm (1.0 in)	31 of 100 (Routine)
Minatitlan	Mexico	Record daily precipitation	94.2 mm (3.7 in)	31 of 100 (Routine)
Verhojansk	Russia	Record high minimum temperature	5.8 C (42.4 F)	31 of 100 (Routine)
Cartersville	United States	Record low minimum temperature	8.3 C (46.9 F)	31 of 100 (Routine)
Highland Home	United States	Record low minimum temperature	11.1 C (52.0 F)	30 of 100 (Routine)
Ostrov Golomjannyj	Russia	Record low maximum temperature	-11.3 C (11.7 F)	29 of 100 (Routine)
Botlih	Russia	Record daily precipitation	26.0 mm (1.0 in)	29 of 100 (Routine)
Colfax	United States	Record daily precipitation	39.9 mm (1.6 in)	29 of 100 (Routine)
Crookston NW Exp STN	United States	Record low minimum temperature	-3.9 C (25.0 F)	29 of 100 (Routine)
Willow Sprg Radio Kuku	United States	Record low maximum temperature	18.3 C (64.9 F)	29 of 100 (Routine)
Usina Rio Dos Campos	Brazil	Record daily precipitation	48.4 mm (1.9 in)	28 of 100 (Routine)
Birtle	Canada	Record low minimum temperature	-3.9 C (25.0 F)	28 of 100 (Routine)
Cypress River	Canada	Record low minimum temperature	-3.9 C (25.0 F)	28 of 100 (Routine)
Sulak	Russia	Record daily precipitation	37.4 mm (1.5 in)	27 of 100 (Routine)
Dunsmuir	United States	Record daily precipitation	30.7 mm (1.2 in)	27 of 100 (Routine)
Warroad	United States	Record low minimum temperature	-4.4 C (24.1 F)	27 of 100 (Routine)
Bay Saint Louis	United States	Record low minimum temperature	14.4 C (57.9 F)	27 of 100 (Routine)
Pembina	United States	Record low minimum temperature	-4.4 C (24.1 F)	27 of 100 (Routine)
Piacaguera (Efsj)	Brazil	Record daily precipitation	36.9 mm (1.5 in)	26 of 100 (Routine)
Union City	United States	Record low minimum temperature	3.3 C (37.9 F)	26 of 100 (Routine)
Water Valley	United States	Record low minimum temperature	6.1 C (43.0 F)	25 of 100 (Routine)
Naselle 2 ENE	United States	Record daily precipitation	57.4 mm (2.3 in)	25 of 100 (Routine)
Tadoussac	Canada	Record low maximum temperature	7.2 C (45.0 F)	24 of 100 (Routine)
Bordeaux-Merignac	France	Record daily precipitation	28.1 mm (1.1 in)	24 of 100 (Routine)
Tres Hermanos	Mexico	Record high minimum temperature	27.2 C (81.0 F)	24 of 100 (Routine)
Saint Helena	United States	Record high minimum temperature	15.0 C (59.0 F)	24 of 100 (Routine)
Detroit Lakes 1 NNE	United States	Record low minimum temperature	-5.0 C (23.0 F)	24 of 100 (Routine)
Mora	United States	Record low minimum temperature	-3.9 C (25.0 F)	24 of 100 (Routine)
University	United States	Record low minimum temperature	8.3 C (46.9 F)	24 of 100 (Routine)
Haskins Dam	United States	Record daily precipitation	42.9 mm (1.7 in)	24 of 100 (Routine)
Shawano 2SSW	United States	Record low minimum temperature	-5.0 C (23.0 F)	24 of 100 (Routine)

Counts by Type and Timescale

569 records

Records set or tied on 20 September 1973 by type: Highest daily maximum 35, Lowest daily maximum 60, Highest daily minimum 56, Lowest daily minimum 157, Heaviest daily rainfall 261.

Records on 20 September 1973 by type
Record type	Records
Highest daily maximum	35
Lowest daily maximum	60
Highest daily minimum	56
Lowest daily minimum	157
Heaviest daily rainfall	261
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 20 September 1973 by timescale: all-time 0, monthly 5, daily 564.

How Much Records Were Beaten By

456 broken records

Margins by which the 456 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 87.6. Ties are not counted.

Top 20 by Significance

20 September 1973

Top 20 records on 20 September 1973 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 September 1973	Lake Spaulding, US	daily rain	56.1 mm (2.2 in)	51.5 mm (2.0 in)	43 years	59 of 100 (Notable)
20 September 1973	Wisley, GB	daily rain	55.1 mm (2.2 in)	33.8 mm (1.3 in)	36 years	58 of 100 (Notable)
20 September 1973	Bowman Dam, US	daily rain	45.7 mm (1.8 in)	39.1 mm (1.5 in)	43 years	50 of 100 (Notable)
20 September 1973	Beedeville 4 NE, US	daily rain	91.2 mm (3.6 in)	87.6 mm (3.4 in)	23 years	49 of 100 (Notable)
20 September 1973	Iowa Hill, US	daily rain	33.5 mm (1.3 in)	21.3 mm (0.8 in)	76 years	48 of 100 (Notable)
20 September 1973	Weaverville, US	daily rain	27.9 mm (1.1 in)	21.5 mm (0.8 in)	52 years	47 of 100 (Notable)
20 September 1973	Republic, US	monthly rain	34.8 mm (1.4 in)	7.9 mm (0.31 in)	46 years	46 of 100 (Notable)
20 September 1973	Gernsheim-Allmendfeld, DE	daily rain	26.7 mm (1.1 in)	20.5 mm (0.8 in)	6 years	44 of 100 (Notable)
20 September 1973	Clatskanie, US	daily rain	44.5 mm (1.8 in)	24.2 mm (1.0 in)	28 years	44 of 100 (Notable)
20 September 1973	Packwood, US	daily rain	44.5 mm (1.8 in)	30.5 mm (1.2 in)	0 years	44 of 100 (Notable)
20 September 1973	Eastbourne, GB	daily rain	38.7 mm (1.5 in)	14.3 mm (0.6 in)	52 years	43 of 100 (Notable)
20 September 1973	Blue Canyon Nyack AP, US	daily rain	44.2 mm (1.7 in)	37.3 mm (1.5 in)	28 years	43 of 100 (Notable)
20 September 1973	Tiirikoja, EE	daily rain	28.2 mm (1.1 in)	12.5 mm (0.5 in)	36 years	40 of 100 (Notable)
20 September 1973	Pjalica, RU	daily rain	32.0 mm (1.3 in)	12.9 mm (0.5 in)	32 years	40 of 100 (Notable)
20 September 1973	Forest Glen, US	daily rain	35.3 mm (1.4 in)	29.2 mm (1.1 in)	40 years	40 of 100 (Notable)
20 September 1973	South Slocan, CA	daily rain	32.0 mm (1.3 in)	20.6 mm (0.8 in)	18 years	38 of 100 (Notable)
20 September 1973	Brush Creek Rs, US	daily rain	43.7 mm (1.7 in)	43.7 mm (1.7 in)	35 years	37 of 100 (Notable)
20 September 1973	Talladega, US	daily low min	5.0 C (41.0 F)	2.8 C (5.0 F)	70 years	36 of 100 (Notable)
20 September 1973	Alderpoint, US	daily rain	32.5 mm (1.3 in)	32.5 mm (1.3 in)	32 years	36 of 100 (Notable)
20 September 1973	Gold Run 4 SW, US	daily rain	43.9 mm (1.7 in)	40.1 mm (1.6 in)	4 years	36 of 100 (Notable)

Significance is a score from 0 to 100 combining margin, the age of the old record and the length of the station's record. How it is computed.

The Same Date in Other Years

1812 to 1973

Records set or tied on this calendar date in each year from 1812 to 1973. 1973 had 569 records.

Counts for years before the ledger starts come from the same station rules.

Records on 09-20 in each year
Year	Records
1812	1
1837	1
1840	1
1844	1
1848	2
1851	1
1852	1
1854	2
1855	1
1856	2
1859	2
1860	1
1862	1
1870	1
1871	2
1882	2
1883	1
1884	1
1886	2
1887	1
1888	2
1889	8
1891	4
1893	5
1894	1
1895	2
1896	1
1897	16
1898	4
1899	1
1900	2
1901	3
1902	3
1903	3
1904	12
1905	8
1906	22
1907	11
1908	24
1909	10
1910	8
1911	21
1912	34
1913	48
1914	28
1915	239
1916	28
1917	100
1918	59
1919	55
1920	64
1921	40
1922	52
1923	249
1924	329
1925	330
1926	129
1927	169
1928	144
1929	373
1930	102
1931	564
1932	270
1933	223
1934	349
1935	201
1936	133
1937	385
1938	506
1939	312
1940	591
1941	582
1942	436
1943	419
1944	466
1945	406
1946	766
1947	460
1948	454
1949	268
1950	435
1951	267
1952	434
1953	479
1954	628
1955	625
1956	985
1957	514
1958	410
1959	489
1960	352
1961	384
1962	707
1963	290
1964	482
1965	1,180
1966	414
1967	449
1968	617
1969	604
1970	591
1971	884
1972	582
1973	569
1974	771
1975	527
1976	375
1977	776
1978	1,216
1979	767
1980	567
1981	979
1982	911
1983	1,958
1984	895
1985	730
1986	743
1987	856
1988	698
1989	968
1990	743
1991	1,835
1992	718
1993	1,031
1994	788
1995	1,374
1996	1,077
1997	1,282
1998	1,157
1999	923
2000	908
2001	821
2002	845
2003	910
2004	1,156
2005	960
2006	732
2007	645
2008	648
2009	715
2010	1,497
2011	650
2012	549
2013	595
2014	577
2015	439
2016	778
2017	920
2018	1,020
2019	835
2020	630
2021	565
2022	786
2023	482
2024	596
2025	877
2026	682

Download the Data

Data for records on 1973-09-20: CSV or JSON. Field meanings are on the data page.

Sources: 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)) Made with Natural Earth. Public domain map data. Borders are Natural Earth's de facto depiction. Data as of 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-16. Last revised 16 October 2026 (2026-10-16).

Margin	Records
0 to 20	426
20 to 40	25
40 to 60	4
60 to 80	0
80 to 100	1