Weather Records on 21 September 1951

241 weather records were set or tied worldwide on 21 September 1951. Highest significance: Waianae 798, US.

Key Facts for 21 September 1951

On 21 September 1951, 241 weather records were set or tied at long-record stations worldwide.
75 were record highs and 100 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 3 monthly and 238 daily.
Waianae 798 set a monthly record daily precipitation of 87.4 mm (3.4 in) on 21 September 1951.
Across 155 earlier years (1805 to 2026) the same calendar date averaged 452 records.

Record Map

241 stations

241 station records on 21 September 1951 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 September 1951: highest significance records shown on the map
Station	Country	Type	Value	Significance
Waianae 798	United States	Record daily precipitation	87.4 mm (3.4 in)	61 of 100 (Major)
Theethandathanam	India	Record daily precipitation	77.5 mm (3.1 in)	59 of 100 (Notable)
Kirnur Nam	India	Record daily precipitation	29.5 mm (1.2 in)	49 of 100 (Notable)
Idaho Springs	United States	Record daily snowfall	10.2 cm (4.0 in)	38 of 100 (Notable)
Lares	Puerto Rico [United States]	Record low maximum temperature	26.1 C (79.0 F)	37 of 100 (Notable)
Cheesman	United States	Record daily snowfall	6.4 cm (2.5 in)	31 of 100 (Routine)
Ft Bayard 4W	United States	Record high maximum temperature	34.4 C (93.9 F)	29 of 100 (Routine)
Port Orford 2	United States	Record low maximum temperature	10.6 C (51.1 F)	28 of 100 (Routine)
Yarra River (Yarra Glen)	Australia	Record daily precipitation	25.7 mm (1.0 in)	27 of 100 (Routine)
Arriba	United States	Record daily snowfall	5.1 cm (2.0 in)	27 of 100 (Routine)
N Bend SW Oregon Rgnl AP	United States	Record low maximum temperature	11.1 C (52.0 F)	27 of 100 (Routine)
Karlsruhe	Germany	Record low minimum temperature	1.7 C (35.1 F)	26 of 100 (Routine)
Tobolsk	Russia	Record high maximum temperature	25.4 C (77.7 F)	26 of 100 (Routine)
La Veta Pass	United States	Record daily snowfall	5.1 cm (2.0 in)	26 of 100 (Routine)
North Lake	United States	Record daily snowfall	5.1 cm (2.0 in)	26 of 100 (Routine)
Paradis 7 S	United States	Record daily precipitation	61.0 mm (2.4 in)	26 of 100 (Routine)
Eustis 2 S	United States	Record high minimum temperature	24.4 C (75.9 F)	25 of 100 (Routine)
Fernandina Beach	United States	Record high minimum temperature	25.0 C (77.0 F)	25 of 100 (Routine)
Greensboro	United States	Record daily precipitation	37.1 mm (1.5 in)	24 of 100 (Routine)
Independence	United States	Record high minimum temperature	17.8 C (64.0 F)	24 of 100 (Routine)
Bradenton Exp STN	United States	Record high minimum temperature	24.4 C (75.9 F)	24 of 100 (Routine)
Ft Yates 4 SW	United States	Record low maximum temperature	12.2 C (54.0 F)	24 of 100 (Routine)
Hana 354	United States	Record low minimum temperature	16.7 C (62.1 F)	24 of 100 (Routine)
Helwan (Cairo)	Egypt	Record high maximum temperature	37.0 C (98.6 F)	23 of 100 (Routine)
Ismailia	Egypt	Record high maximum temperature	38.0 C (100.4 F)	23 of 100 (Routine)
Bhadgaon	India	Record daily precipitation	44.2 mm (1.7 in)	23 of 100 (Routine)
Helwan (Cairo)	Egypt	Record high minimum temperature	23.0 C (73.4 F)	22 of 100 (Routine)
Regensburg	Germany	Record low minimum temperature	0.0 C (32.0 F)	22 of 100 (Routine)
Oakley	United States	Record low minimum temperature	-2.2 C (28.0 F)	22 of 100 (Routine)
Tasiilaq	Greenland [Denmark]	Record daily precipitation	27.5 mm (1.1 in)	21 of 100 (Routine)
Munchen-Nymphenburg	Germany	Record low minimum temperature	0.9 C (33.6 F)	21 of 100 (Routine)
Bratsk	Russia	Record high minimum temperature	9.4 C (48.9 F)	21 of 100 (Routine)
Inverness 3 SE	United States	Record high minimum temperature	23.9 C (75.0 F)	21 of 100 (Routine)
Lodgepole	United States	Record low maximum temperature	11.1 C (52.0 F)	21 of 100 (Routine)
Anderson	United States	Record daily precipitation	29.5 mm (1.2 in)	21 of 100 (Routine)
Watertown Rgnl AP	United States	Record low maximum temperature	8.9 C (48.0 F)	21 of 100 (Routine)
Goodland	United States	Record low maximum temperature	11.1 C (52.0 F)	21 of 100 (Routine)
Jurokine	Australia	Record daily precipitation	11.4 mm (0.4 in)	20 of 100 (Routine)
Woomera (South Gap Station)	Australia	Record daily precipitation	6.9 mm (0.27 in)	20 of 100 (Routine)
Boulder	United States	Record daily snowfall	3.8 cm (1.5 in)	20 of 100 (Routine)
Fraser	United States	Record daily precipitation	17.8 mm (0.7 in)	20 of 100 (Routine)
Ft Lupton 2 SE	United States	Record daily precipitation	16.8 mm (0.7 in)	20 of 100 (Routine)
Idracowra	Australia	Record daily precipitation	1.8 mm (0.07 in)	20 of 100 (Routine)
Kon-Kolodez	Russia	Record daily precipitation	10.0 mm (0.4 in)	20 of 100 (Routine)
Arriba	United States	Record daily precipitation	11.4 mm (0.4 in)	20 of 100 (Routine)
Yatina	Australia	Record daily precipitation	14.0 mm (0.6 in)	20 of 100 (Routine)
Victoria Sugar Mill	Australia	Record daily precipitation	11.7 mm (0.5 in)	20 of 100 (Routine)
Hawthorne	United States	Record daily snowfall	3.8 cm (1.5 in)	20 of 100 (Routine)
Hawthorne	United States	Record daily precipitation	18.8 mm (0.7 in)	20 of 100 (Routine)
Longmont 2 ESE	United States	Record daily precipitation	14.0 mm (0.6 in)	20 of 100 (Routine)
Pitkin	United States	Record daily precipitation	10.2 mm (0.4 in)	20 of 100 (Routine)
Black Point 717	United States	Record daily precipitation	10.9 mm (0.4 in)	20 of 100 (Routine)
Surgut	Russia	Record high minimum temperature	10.6 C (51.1 F)	20 of 100 (Routine)
North Lake	United States	Record daily precipitation	15.2 mm (0.6 in)	20 of 100 (Routine)
Gray	United States	Record low minimum temperature	-6.7 C (19.9 F)	20 of 100 (Routine)
Casper 2 E	United States	Record low maximum temperature	9.4 C (48.9 F)	20 of 100 (Routine)
Makaweli 965	United States	Record low maximum temperature	27.8 C (82.0 F)	20 of 100 (Routine)
Quatsino	Canada	Record high maximum temperature	26.1 C (79.0 F)	19 of 100 (Routine)
Ghatal	India	Record daily precipitation	47.0 mm (1.9 in)	19 of 100 (Routine)
Cramond, Albert Fall	South Africa	Record daily precipitation	56.4 mm (2.2 in)	19 of 100 (Routine)

Counts by Type and Timescale

241 records

Records set or tied on 21 September 1951 by type: Highest daily maximum 36, Lowest daily maximum 55, Highest daily minimum 39, Lowest daily minimum 45, Heaviest daily rainfall 59, Heaviest daily snowfall 7.

Records on 21 September 1951 by type
Record type	Records
Highest daily maximum	36
Lowest daily maximum	55
Highest daily minimum	39
Lowest daily minimum	45
Heaviest daily rainfall	59
Heaviest daily snowfall	7
Deepest snow cover	0

Records on 21 September 1951 by timescale: all-time 0, monthly 3, daily 238.

How Much Records Were Beaten By

188 broken records

Margins by which the 188 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 102.0. Ties are not counted.

Top 20 by Significance

21 September 1951

Top 20 records on 21 September 1951 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 September 1951	Waianae 798, US	monthly rain	87.4 mm (3.4 in)	29.7 mm (1.2 in)	43 years	61 of 100 (Major)
21 September 1951	Theethandathanam, IN	daily rain	77.5 mm (3.1 in)	53.4 mm (2.1 in)	48 years	59 of 100 (Notable)
21 September 1951	Kirnur Nam, IN	daily rain	29.5 mm (1.2 in)	24.9 mm (1.0 in)	36 years	49 of 100 (Notable)
21 September 1951	Idaho Springs, US	daily snowfall	10.2 cm (4.0 in)	10.2 cm (4.0 in)	44 years	38 of 100 (Notable)
21 September 1951	Lares, PR	daily low max	26.1 C (79.0 F)	2.8 C (5.0 F)	48 years	37 of 100 (Notable)
21 September 1951	Cheesman, US	daily snowfall	6.4 cm (2.5 in)	6.4 cm (2.5 in)	48 years	31 of 100 (Routine)
21 September 1951	Ft Bayard 4W, US	daily high max	34.4 C (93.9 F)	3.8 C (6.8 F)	40 years	29 of 100 (Routine)
21 September 1951	Port Orford 2, US	daily low max	10.6 C (51.1 F)	3.8 C (6.8 F)	44 years	28 of 100 (Routine)
21 September 1951	Yarra River (Yarra Glen), AU	daily rain	25.7 mm (1.0 in)	14.3 mm (0.6 in)	10 years	27 of 100 (Routine)
21 September 1951	Arriba, US	daily snowfall	5.1 cm (2.0 in)	5.1 cm (2.0 in)	44 years	27 of 100 (Routine)
21 September 1951	N Bend SW Oregon Rgnl AP, US	monthly low max	11.1 C (52.0 F)	1.1 C (2.0 F)	31 years	27 of 100 (Routine)
21 September 1951	Karlsruhe, DE	daily low min	1.7 C (35.1 F)	1.8 C (3.2 F)	46 years	26 of 100 (Routine)
21 September 1951	Tobolsk, RU	daily high max	25.4 C (77.7 F)	5.8 C (10.4 F)	38 years	26 of 100 (Routine)
21 September 1951	La Veta Pass, US	daily snowfall	5.1 cm (2.0 in)	5.1 cm (2.0 in)	41 years	26 of 100 (Routine)
21 September 1951	North Lake, US	daily snowfall	5.1 cm (2.0 in)	5.1 cm (2.0 in)	41 years	26 of 100 (Routine)
21 September 1951	Paradis 7 S, US	daily rain	61.0 mm (2.4 in)	41.2 mm (1.6 in)	22 years	26 of 100 (Routine)
21 September 1951	Eustis 2 S, US	daily high min	24.4 C (75.9 F)	0.5 C (0.9 F)	56 years	25 of 100 (Routine)
21 September 1951	Fernandina Beach, US	daily high min	25.0 C (77.0 F)	0.6 C (1.1 F)	55 years	25 of 100 (Routine)
21 September 1951	Greensboro, US	daily rain	37.1 mm (1.5 in)	5.3 mm (0.21 in)	52 years	24 of 100 (Routine)
21 September 1951	Independence, US	daily high min	17.8 C (64.0 F)	1.7 C (3.1 F)	51 years	24 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 1951

Records set or tied on this calendar date in each year from 1805 to 1951. 1951 had 241 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	591
2026	478

Download the Data

Data for records on 1951-09-21: 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 2026-10-16 (16 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).

Margin	Records
0 to 20	176
20 to 40	5
40 to 60	5
60 to 80	1
80 to 100	0
100 to 120	1