Weather Records on 20 September 1939

312 weather records were set or tied worldwide on 20 September 1939. Highest significance: Ankenes, NO.

Key Facts for 20 September 1939

On 20 September 1939, 312 weather records were set or tied at long-record stations worldwide.
219 were record highs and 20 were record lows, counting maximum and minimum temperature.
By timescale, 4 were all-time records, 14 monthly and 294 daily.
Ankenes set an all-time record daily precipitation of 68.1 mm (2.7 in) on 20 September 1939.
Across 156 earlier years (1812 to 2026) the same calendar date averaged 443 records.

Record Map

312 stations

312 station records on 20 September 1939 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 September 1939: highest significance records shown on the map
Station	Country	Type	Value	Significance
Ankenes	Norway	Record daily precipitation	68.1 mm (2.7 in)	57 of 100 (Notable)
Skjomen	Norway	Record daily precipitation	65.6 mm (2.6 in)	56 of 100 (Notable)
Charleston	United States	Record daily precipitation	59.7 mm (2.4 in)	52 of 100 (Notable)
Krakmo	Norway	Record daily precipitation	60.8 mm (2.4 in)	51 of 100 (Notable)
San Diego Wbo	United States	Record high minimum temperature	24.4 C (75.9 F)	49 of 100 (Notable)
San Diego Wbo	United States	Record high maximum temperature	37.2 C (99.0 F)	42 of 100 (Notable)
Fernandina Beach	United States	Record daily precipitation	121.2 mm (4.8 in)	42 of 100 (Notable)
Harapanahalli	India	Record daily precipitation	85.9 mm (3.4 in)	40 of 100 (Notable)
Kingman	United States	Record daily precipitation	31.8 mm (1.3 in)	40 of 100 (Notable)
Riksgransen	Sweden	Record daily precipitation	62.8 mm (2.5 in)	39 of 100 (Notable)
Queenstown (Copper Mine)	Australia	Record daily precipitation	54.1 mm (2.1 in)	37 of 100 (Notable)
Yreka	United States	Record high minimum temperature	17.8 C (64.0 F)	35 of 100 (Notable)
Gormanston (Gould Street)	Australia	Record daily precipitation	65.5 mm (2.6 in)	29 of 100 (Routine)
Berkeley	United States	Record high minimum temperature	19.4 C (66.9 F)	29 of 100 (Routine)
Represa	United States	Record high maximum temperature	36.7 C (98.1 F)	29 of 100 (Routine)
Spreckels Hwy Brg	United States	Record high maximum temperature	37.8 C (100.0 F)	29 of 100 (Routine)
Zeehan Post Office	Australia	Record daily precipitation	56.1 mm (2.2 in)	28 of 100 (Routine)
Sulitjelma	Norway	Record daily precipitation	42.1 mm (1.7 in)	28 of 100 (Routine)
Le Grand	United States	Record high minimum temperature	22.2 C (72.0 F)	26 of 100 (Routine)
Napa State Hospital	United States	Record high minimum temperature	18.3 C (64.9 F)	26 of 100 (Routine)
Santa Barbara	United States	Record high maximum temperature	40.0 C (104.0 F)	26 of 100 (Routine)
Waimanalo 794	United States	Record low minimum temperature	17.8 C (64.0 F)	26 of 100 (Routine)
Oakland	United States	Record high minimum temperature	18.3 C (64.9 F)	25 of 100 (Routine)
Paso Robles	United States	Record high minimum temperature	18.9 C (66.0 F)	25 of 100 (Routine)
Resaca	United States	Record daily precipitation	30.5 mm (1.2 in)	25 of 100 (Routine)
University Exp STN	United States	Record low minimum temperature	-13.3 C (8.1 F)	25 of 100 (Routine)
N Bend SW Oregon Rgnl AP	United States	Record high maximum temperature	30.0 C (86.0 F)	25 of 100 (Routine)
Markapur	India	Record daily precipitation	33.3 mm (1.3 in)	24 of 100 (Routine)
Denair 3 NNE	United States	Record high minimum temperature	20.6 C (69.1 F)	24 of 100 (Routine)
Los Gatos	United States	Record high minimum temperature	17.8 C (64.0 F)	24 of 100 (Routine)
Pasadena	United States	Record high minimum temperature	22.8 C (73.0 F)	24 of 100 (Routine)
Paragonah	United States	Record high minimum temperature	18.3 C (64.9 F)	24 of 100 (Routine)
Gudur(Guduru)	India	Record daily precipitation	52.3 mm (2.1 in)	23 of 100 (Routine)
Claremont Pomona Clg	United States	Record high maximum temperature	43.3 C (109.9 F)	23 of 100 (Routine)
Claremont Pomona Clg	United States	Record high minimum temperature	22.2 C (72.0 F)	23 of 100 (Routine)
Elsinore	United States	Record high minimum temperature	20.6 C (69.1 F)	23 of 100 (Routine)
Saundatti	India	Record daily precipitation	62.7 mm (2.5 in)	22 of 100 (Routine)
Bridgeport 5 NW	United States	Record daily precipitation	35.1 mm (1.4 in)	22 of 100 (Routine)
Hollister 1 SW	United States	Record high minimum temperature	18.3 C (64.9 F)	22 of 100 (Routine)
Pomona/Fairplex	United States	Record high minimum temperature	20.0 C (68.0 F)	22 of 100 (Routine)
Santa Maria	United States	Record high maximum temperature	36.1 C (97.0 F)	22 of 100 (Routine)
Sierra Madre Henszey	United States	Record high minimum temperature	26.7 C (80.1 F)	22 of 100 (Routine)
Tiger Creek Ph	United States	Record high minimum temperature	21.1 C (70.0 F)	22 of 100 (Routine)
Drevja	Norway	Record daily precipitation	27.7 mm (1.1 in)	21 of 100 (Routine)
Escondido	United States	Record high maximum temperature	41.7 C (107.1 F)	21 of 100 (Routine)
Folsom	United States	Record high minimum temperature	22.8 C (73.0 F)	21 of 100 (Routine)
Oroville 1 N	United States	Record high minimum temperature	21.1 C (70.0 F)	21 of 100 (Routine)
Pomona/Fairplex	United States	Record high maximum temperature	42.2 C (108.0 F)	21 of 100 (Routine)
Astoria	United States	Record high maximum temperature	28.9 C (84.0 F)	21 of 100 (Routine)
Eugene	United States	Record high minimum temperature	16.1 C (61.0 F)	21 of 100 (Routine)
Maatsuyker Island Lighthouse	Australia	Record daily precipitation	24.1 mm (0.9 in)	20 of 100 (Routine)
Independence	United States	Record daily precipitation	9.7 mm (0.38 in)	20 of 100 (Routine)
Cape Sorell	Australia	Record daily precipitation	21.6 mm (0.9 in)	20 of 100 (Routine)
Avon Downs	Australia	Record daily precipitation	18.0 mm (0.7 in)	20 of 100 (Routine)
Franklin	Australia	Record daily precipitation	16.3 mm (0.6 in)	20 of 100 (Routine)
Barrow Creek	Australia	Record daily precipitation	6.4 mm (0.25 in)	20 of 100 (Routine)
Merriwa (Terragong)	Australia	Record daily precipitation	11.4 mm (0.4 in)	20 of 100 (Routine)
Mariyna Gorka	Belarus	Record daily precipitation	18.0 mm (0.7 in)	20 of 100 (Routine)
New Westminster	Canada	Record high maximum temperature	25.6 C (78.1 F)	20 of 100 (Routine)
Cheljabinsk-Balandi	Russia	Record daily precipitation	8.8 mm (0.35 in)	20 of 100 (Routine)

Counts by Type and Timescale

312 records

Records set or tied on 20 September 1939 by type: Highest daily maximum 119, Lowest daily maximum 5, Highest daily minimum 100, Lowest daily minimum 15, Heaviest daily rainfall 73.

Records on 20 September 1939 by type
Record type	Records
Highest daily maximum	119
Lowest daily maximum	5
Highest daily minimum	100
Lowest daily minimum	15
Heaviest daily rainfall	73
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 20 September 1939 by timescale: all-time 4, monthly 14, daily 294.

How Much Records Were Beaten By

249 broken records

Margins by which the 249 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 83.4. Ties are not counted.

Top 20 by Significance

20 September 1939

Top 20 records on 20 September 1939 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 September 1939	Ankenes, NO	all-time rain	68.1 mm (2.7 in)	18.3 mm (0.7 in)	7 years	57 of 100 (Notable)
20 September 1939	Skjomen, NO	all-time rain	65.6 mm (2.6 in)	13.6 mm (0.5 in)	32 years	56 of 100 (Notable)
20 September 1939	Charleston, US	daily rain	59.7 mm (2.4 in)	47.0 mm (1.9 in)	33 years	52 of 100 (Notable)
20 September 1939	Krakmo, NO	daily rain	60.8 mm (2.4 in)	39.5 mm (1.6 in)	26 years	51 of 100 (Notable)
20 September 1939	San Diego Wbo, US	all-time high min	24.4 C (75.9 F)	1.6 C (2.9 F)	53 years	49 of 100 (Notable)
20 September 1939	San Diego Wbo, US	daily high max	37.2 C (99.0 F)	7.8 C (14.0 F)	26 years	42 of 100 (Notable)
20 September 1939	Fernandina Beach, US	daily rain	121.2 mm (4.8 in)	83.4 mm (3.3 in)	36 years	42 of 100 (Notable)
20 September 1939	Harapanahalli, IN	daily rain	85.9 mm (3.4 in)	50.6 mm (2.0 in)	18 years	40 of 100 (Notable)
20 September 1939	Kingman, US	daily rain	31.8 mm (1.3 in)	28.8 mm (1.1 in)	4 years	40 of 100 (Notable)
20 September 1939	Riksgransen, SE	monthly rain	62.8 mm (2.5 in)	11.3 mm (0.4 in)	32 years	39 of 100 (Notable)
20 September 1939	Queenstown (Copper Mine), AU	daily rain	54.1 mm (2.1 in)	28.2 mm (1.1 in)	28 years	37 of 100 (Notable)
20 September 1939	Yreka, US	daily high min	17.8 C (64.0 F)	7.2 C (13.0 F)	37 years	35 of 100 (Notable)
20 September 1939	Gormanston (Gould Street), AU	daily rain	65.5 mm (2.6 in)	28.2 mm (1.1 in)	5 years	29 of 100 (Routine)
20 September 1939	Berkeley, US	daily high min	19.4 C (66.9 F)	3.8 C (6.8 F)	8 years	29 of 100 (Routine)
20 September 1939	Represa, US	daily high max	36.7 C (98.1 F)	4.5 C (8.1 F)	44 years	29 of 100 (Routine)
20 September 1939	Spreckels Hwy Brg, US	daily high max	37.8 C (100.0 F)	7.8 C (14.0 F)	26 years	29 of 100 (Routine)
20 September 1939	Zeehan Post Office, AU	daily rain	56.1 mm (2.2 in)	21.8 mm (0.9 in)	5 years	28 of 100 (Routine)
20 September 1939	Sulitjelma, NO	daily rain	42.1 mm (1.7 in)	17.6 mm (0.7 in)	2 years	28 of 100 (Routine)
20 September 1939	Le Grand, US	daily high min	22.2 C (72.0 F)	4.4 C (7.9 F)	33 years	26 of 100 (Routine)
20 September 1939	Napa State Hospital, US	daily high min	18.3 C (64.9 F)	3.9 C (7.0 F)	30 years	26 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

1812 to 1939

Records set or tied on this calendar date in each year from 1812 to 1939. 1939 had 312 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 1939-09-20: 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 2026-10-15. Last revised 15 October 2026 (2026-10-15).

Margin	Records
0 to 20	237
20 to 40	9
40 to 60	2
60 to 80	0
80 to 100	1