Weather Records on 21 September 1973

421 weather records were set or tied worldwide on 21 September 1973. Highest significance: West Terschelling, NL.

Key Facts for 21 September 1973

On 21 September 1973, 421 weather records were set or tied at long-record stations worldwide.
69 were record highs and 211 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 3 monthly and 418 daily.
West Terschelling set a daily record precipitation of 42.5 mm (1.7 in) on 21 September 1973.
Across 155 earlier years (1805 to 2026) the same calendar date averaged 451 records.

Record Map

421 stations

421 station records on 21 September 1973 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 September 1973: highest significance records shown on the map
Station	Country	Type	Value	Significance
West Terschelling	Netherlands	Record daily precipitation	42.5 mm (1.7 in)	68 of 100 (Major)
The Downs	South Africa	Record daily precipitation	51.0 mm (2.0 in)	55 of 100 (Notable)
Gordon Downs	Australia	Record daily precipitation	43.2 mm (1.7 in)	49 of 100 (Notable)
Bederkesa	Germany	Record daily precipitation	26.9 mm (1.1 in)	44 of 100 (Notable)
Den Helder-1	Netherlands	Record daily precipitation	35.7 mm (1.4 in)	41 of 100 (Notable)
Crookston NW Exp STN	United States	Record daily precipitation	35.8 mm (1.4 in)	41 of 100 (Notable)
Leiden	Netherlands	Record daily precipitation	33.0 mm (1.3 in)	40 of 100 (Notable)
Schellingwoude	Netherlands	Record daily precipitation	33.5 mm (1.3 in)	39 of 100 (Notable)
Cotswold Hills	Australia	Record daily precipitation	25.4 mm (1.0 in)	38 of 100 (Notable)
Mine Centre	Canada	Record daily precipitation	47.8 mm (1.9 in)	38 of 100 (Notable)
Woodstock	Canada	Record low minimum temperature	-2.2 C (28.0 F)	38 of 100 (Notable)
Ada	United States	Record daily precipitation	33.0 mm (1.3 in)	38 of 100 (Notable)
Angus 1 N	United States	Record daily precipitation	43.4 mm (1.7 in)	38 of 100 (Notable)
Durham	Canada	Record low minimum temperature	-3.3 C (26.1 F)	37 of 100 (Notable)
Hoorn	Netherlands	Record daily precipitation	25.2 mm (1.0 in)	37 of 100 (Notable)
Arhangelsk	Russia	Record low minimum temperature	-2.0 C (28.4 F)	37 of 100 (Notable)
Falsterbo	Sweden	Record daily precipitation	29.5 mm (1.2 in)	37 of 100 (Notable)
Amsterdam	Netherlands	Record daily precipitation	33.5 mm (1.3 in)	36 of 100 (Notable)
Grand Forks UNIV (NWS)	United States	Record daily precipitation	44.5 mm (1.8 in)	36 of 100 (Notable)
Caribou Island	Canada	Record daily precipitation	33.0 mm (1.3 in)	34 of 100 (Routine)
Sharon	United States	Record daily precipitation	50.8 mm (2.0 in)	34 of 100 (Routine)
Nicholson	Australia	Record daily precipitation	33.0 mm (1.3 in)	32 of 100 (Routine)
Mohall	United States	Record low maximum temperature	8.3 C (46.9 F)	32 of 100 (Routine)
Castle Rock	United States	Record high maximum temperature	30.0 C (86.0 F)	31 of 100 (Routine)
Ganca	Azerbaijan	Record low maximum temperature	15.5 C (59.9 F)	30 of 100 (Routine)
Tranebjerg	Denmark	Record daily precipitation	30.0 mm (1.2 in)	30 of 100 (Routine)
Humboldt 3 W	United States	Record daily precipitation	30.5 mm (1.2 in)	30 of 100 (Routine)
Chestnut Hill	United States	Record low minimum temperature	3.9 C (39.0 F)	30 of 100 (Routine)
Appleton	United States	Record daily precipitation	34.3 mm (1.4 in)	30 of 100 (Routine)
Sprague	Canada	Record daily precipitation	36.6 mm (1.4 in)	29 of 100 (Routine)
Aiken 5SE	United States	Record daily precipitation	49.5 mm (1.9 in)	29 of 100 (Routine)
Grand Forks Intl AP	United States	Record daily precipitation	40.1 mm (1.6 in)	29 of 100 (Routine)
Fort Frances	Canada	Record daily precipitation	39.9 mm (1.6 in)	28 of 100 (Routine)
Brucefield	Canada	Record low minimum temperature	-0.6 C (30.9 F)	28 of 100 (Routine)
Blackleaf	United States	Record high minimum temperature	7.2 C (45.0 F)	28 of 100 (Routine)
Westfield 2 SSE	United States	Record low minimum temperature	3.9 C (39.0 F)	28 of 100 (Routine)
Russell	Canada	Record low maximum temperature	5.0 C (41.0 F)	27 of 100 (Routine)
Juchitan de Zaragoza	Mexico	Record high maximum temperature	38.3 C (100.9 F)	27 of 100 (Routine)
Virden	Canada	Record low maximum temperature	6.7 C (44.1 F)	26 of 100 (Routine)
Malin Head	Ireland	Record daily precipitation	25.3 mm (1.0 in)	26 of 100 (Routine)
Putten (Gld)	Netherlands	Record daily precipitation	31.5 mm (1.2 in)	26 of 100 (Routine)
San Sebastian - Igueldo	Spain	Record daily precipitation	68.9 mm (2.7 in)	26 of 100 (Routine)
Pahoa 65	United States	Record daily precipitation	50.8 mm (2.0 in)	26 of 100 (Routine)
N Bend SW Oregon Rgnl AP	United States	Record high minimum temperature	15.0 C (59.0 F)	26 of 100 (Routine)
El Chico	Mexico	Record low minimum temperature	5.6 C (42.1 F)	25 of 100 (Routine)
Itanhaem	Brazil	Record daily precipitation	44.7 mm (1.8 in)	24 of 100 (Routine)
Lambton	Canada	Record low minimum temperature	-3.3 C (26.1 F)	24 of 100 (Routine)
Zuara	Libya	Record high maximum temperature	40.0 C (104.0 F)	24 of 100 (Routine)
Francisco I. Madero	Mexico	Record low maximum temperature	16.7 C (62.1 F)	24 of 100 (Routine)
Syktyvkar	Russia	Record low maximum temperature	2.5 C (36.5 F)	24 of 100 (Routine)
Lake Spaulding	United States	Record low minimum temperature	-2.8 C (27.0 F)	24 of 100 (Routine)
Colgate	United States	Record daily precipitation	32.5 mm (1.3 in)	24 of 100 (Routine)
Fessenden	United States	Record low maximum temperature	8.3 C (46.9 F)	24 of 100 (Routine)
Batesburg	United States	Record daily precipitation	34.5 mm (1.4 in)	24 of 100 (Routine)
Haina 214	United States	Record high minimum temperature	21.7 C (71.1 F)	24 of 100 (Routine)
Roelofarendsveen	Netherlands	Record daily precipitation	27.7 mm (1.1 in)	23 of 100 (Routine)
Boskoop	Netherlands	Record daily precipitation	27.8 mm (1.1 in)	23 of 100 (Routine)
Zegveld	Netherlands	Record daily precipitation	25.7 mm (1.0 in)	23 of 100 (Routine)
Vaughn	United States	Record high minimum temperature	17.8 C (64.0 F)	23 of 100 (Routine)
Granville	United States	Record low maximum temperature	8.3 C (46.9 F)	23 of 100 (Routine)

Counts by Type and Timescale

421 records

Records set or tied on 21 September 1973 by type: Highest daily maximum 32, Lowest daily maximum 96, Highest daily minimum 37, Lowest daily minimum 115, Heaviest daily rainfall 141.

Records on 21 September 1973 by type
Record type	Records
Highest daily maximum	32
Lowest daily maximum	96
Highest daily minimum	37
Lowest daily minimum	115
Heaviest daily rainfall	141
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 21 September 1973 by timescale: all-time 0, monthly 3, daily 418.

How Much Records Were Beaten By

310 broken records

Margins by which the 310 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 43.6. Ties are not counted.

Top 20 by Significance

21 September 1973

Top 20 records on 21 September 1973 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 September 1973	West Terschelling, NL	daily rain	42.5 mm (1.7 in)	21.5 mm (0.8 in)	79 years	68 of 100 (Major)
21 September 1973	The Downs, ZA	daily rain	51.0 mm (2.0 in)	43.6 mm (1.7 in)	31 years	55 of 100 (Notable)
21 September 1973	Gordon Downs, AU	monthly rain	43.2 mm (1.7 in)	33.0 mm (1.3 in)	5 years	49 of 100 (Notable)
21 September 1973	Bederkesa, DE	daily rain	26.9 mm (1.1 in)	11.6 mm (0.5 in)	60 years	44 of 100 (Notable)
21 September 1973	Den Helder-1, NL	daily rain	35.7 mm (1.4 in)	11.5 mm (0.5 in)	43 years	41 of 100 (Notable)
21 September 1973	Crookston NW Exp STN, US	daily rain	35.8 mm (1.4 in)	28.4 mm (1.1 in)	18 years	41 of 100 (Notable)
21 September 1973	Leiden, NL	daily rain	33.0 mm (1.3 in)	18.0 mm (0.7 in)	28 years	40 of 100 (Notable)
21 September 1973	Schellingwoude, NL	daily rain	33.5 mm (1.3 in)	17.3 mm (0.7 in)	28 years	39 of 100 (Notable)
21 September 1973	Cotswold Hills, AU	daily rain	25.4 mm (1.0 in)	25.4 mm (1.0 in)	35 years	38 of 100 (Notable)
21 September 1973	Mine Centre, CA	daily rain	47.8 mm (1.9 in)	17.3 mm (0.7 in)	48 years	38 of 100 (Notable)
21 September 1973	Woodstock, CA	daily low min	-2.2 C (28.0 F)	0.5 C (0.9 F)	93 years	38 of 100 (Notable)
21 September 1973	Ada, US	daily rain	33.0 mm (1.3 in)	15.2 mm (0.6 in)	47 years	38 of 100 (Notable)
21 September 1973	Angus 1 N, US	daily rain	43.4 mm (1.7 in)	26.1 mm (1.0 in)	18 years	38 of 100 (Notable)
21 September 1973	Durham, CA	daily low min	-3.3 C (26.1 F)	3.3 C (5.9 F)	75 years	37 of 100 (Notable)
21 September 1973	Hoorn, NL	daily rain	25.2 mm (1.0 in)	7.8 mm (0.31 in)	52 years	37 of 100 (Notable)
21 September 1973	Arhangelsk, RU	daily low min	-2.0 C (28.4 F)	0.7 C (1.3 F)	91 years	37 of 100 (Notable)
21 September 1973	Falsterbo, SE	daily rain	29.5 mm (1.2 in)	13.7 mm (0.5 in)	6 years	37 of 100 (Notable)
21 September 1973	Amsterdam, NL	daily rain	33.5 mm (1.3 in)	16.0 mm (0.6 in)	28 years	36 of 100 (Notable)
21 September 1973	Grand Forks UNIV (NWS), US	daily rain	44.5 mm (1.8 in)	26.2 mm (1.0 in)	18 years	36 of 100 (Notable)
21 September 1973	Caribou Island, CA	daily rain	33.0 mm (1.3 in)	23.1 mm (0.9 in)	8 years	34 of 100 (Routine)

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

1805 to 1973

Records set or tied on this calendar date in each year from 1805 to 1973. 1973 had 421 records.

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

Records on 09-21 in each year
Year	Records
1805	1
1812	1
1825	2
1840	1
1841	1
1842	1
1848	1
1854	1
1856	2
1868	1
1872	2
1873	1
1877	1
1878	1
1881	1
1882	1
1884	1
1886	1
1888	2
1889	1
1891	10
1892	1
1893	10
1894	2
1895	3
1896	2
1897	6
1898	6
1899	3
1900	2
1901	5
1902	5
1903	8
1904	20
1905	12
1906	17
1907	10
1908	17
1909	10
1910	8
1911	18
1912	26
1913	37
1914	29
1915	34
1916	48
1917	28
1918	43
1919	54
1920	29
1921	64
1922	35
1923	232
1924	291
1925	278
1926	178
1927	165
1928	81
1929	232
1930	82
1931	681
1932	242
1933	193
1934	492
1935	199
1936	329
1937	487
1938	508
1939	308
1940	908
1941	416
1942	291
1943	407
1944	413
1945	507
1946	176
1947	534
1948	301
1949	298
1950	334
1951	241
1952	430
1953	382
1954	453
1955	752
1956	1,100
1957	366
1958	588
1959	513
1960	418
1961	441
1962	1,085
1963	306
1964	374
1965	1,088
1966	565
1967	577
1968	790
1969	593
1970	708
1971	645
1972	599
1973	421
1974	652
1975	528
1976	694
1977	918
1978	818
1979	736
1980	990
1981	696
1982	1,484
1983	2,207
1984	707
1985	796
1986	671
1987	965
1988	557
1989	1,002
1990	716
1991	1,021
1992	752
1993	911
1994	713
1995	2,002
1996	1,233
1997	1,112
1998	1,481
1999	1,025
2000	884
2001	718
2002	696
2003	959
2004	888
2005	1,143
2006	920
2007	742
2008	740
2009	715
2010	1,290
2011	542
2012	595
2013	769
2014	716
2015	565
2016	989
2017	1,178
2018	1,051
2019	833
2020	580
2021	465
2022	1,049
2023	783
2024	470
2025	588
2026	469

Download the Data

Data for records on 1973-09-21: 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 2026-10-14 (14 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).

Histogram of margins by which records were beaten on 21 September 1973
Margin	Records
0 to 10	269
10 to 20	25
20 to 30	13
30 to 40	2
40 to 50	1