Weather Records on 12 September 1939

702 weather records were set or tied worldwide on 12 September 1939. Highest significance: Pendraka, IN.

Key Facts for 12 September 1939

On 12 September 1939, 702 weather records were set or tied at long-record stations worldwide.
450 were record highs and 112 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 20 monthly and 682 daily.
Pendraka set a daily record precipitation of 63.5 mm (2.5 in) on 12 September 1939.
Across 164 earlier years (1793 to 2026) the same calendar date averaged 412 records.

Record Map

702 stations

702 station records on 12 September 1939 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 12 September 1939: highest significance records shown on the map
Station	Country	Type	Value	Significance
Pendraka	India	Record daily precipitation	63.5 mm (2.5 in)	44 of 100 (Notable)
Mohawk	United States	Record daily precipitation	25.4 mm (1.0 in)	44 of 100 (Notable)
Dimapur	India	Record daily precipitation	93.0 mm (3.7 in)	39 of 100 (Notable)
Harrison 1 NNW	United States	Record daily precipitation	43.2 mm (1.7 in)	38 of 100 (Notable)
Ogden 2	United States	Record daily precipitation	32.0 mm (1.3 in)	38 of 100 (Notable)
Salome 6 SE	United States	Record daily precipitation	27.9 mm (1.1 in)	37 of 100 (Notable)
New London	United States	Record daily precipitation	72.4 mm (2.9 in)	35 of 100 (Notable)
Milan	Italy	Record daily precipitation	59.2 mm (2.3 in)	34 of 100 (Routine)
Big Rapids Wtp	United States	Record daily precipitation	58.4 mm (2.3 in)	34 of 100 (Routine)
Midland 2	United States	Record daily precipitation	42.7 mm (1.7 in)	34 of 100 (Routine)
Seligman	United States	Record daily precipitation	43.2 mm (1.7 in)	33 of 100 (Routine)
St George	United States	Record daily precipitation	36.6 mm (1.4 in)	29 of 100 (Routine)
Sacaton	United States	Record daily precipitation	37.8 mm (1.5 in)	28 of 100 (Routine)
Sydney (Observatory Hill)	Australia	Record low minimum temperature	5.6 C (42.1 F)	27 of 100 (Routine)
Colby	United States	Record high minimum temperature	21.7 C (71.1 F)	27 of 100 (Routine)
Menasha	United States	Record daily precipitation	71.1 mm (2.8 in)	27 of 100 (Routine)
Woodside	Australia	Record daily precipitation	53.8 mm (2.1 in)	26 of 100 (Routine)
Sambalpur	India	Record daily precipitation	64.5 mm (2.5 in)	26 of 100 (Routine)
Granite Reef Dam	United States	Record low maximum temperature	30.6 C (87.1 F)	26 of 100 (Routine)
Salome 6 SE	United States	Record low maximum temperature	25.0 C (77.0 F)	26 of 100 (Routine)
W Pt	United States	Record high minimum temperature	26.7 C (80.1 F)	26 of 100 (Routine)
Tekamah	United States	Record high minimum temperature	23.9 C (75.0 F)	25 of 100 (Routine)
Sonora	United States	Record low maximum temperature	16.1 C (61.0 F)	24 of 100 (Routine)
Manassa	United States	Record high maximum temperature	31.7 C (89.1 F)	24 of 100 (Routine)
Audubon	United States	Record high minimum temperature	23.3 C (73.9 F)	24 of 100 (Routine)
Bay City	United States	Record daily precipitation	34.3 mm (1.4 in)	24 of 100 (Routine)
Port Gibson 1 NE	United States	Record daily precipitation	36.3 mm (1.4 in)	24 of 100 (Routine)
Tashkent	Uzbekistan	Record low minimum temperature	5.5 C (41.9 F)	24 of 100 (Routine)
Healdsburg	United States	Record low maximum temperature	15.6 C (60.1 F)	23 of 100 (Routine)
Tularosa	United States	Record daily precipitation	41.1 mm (1.6 in)	23 of 100 (Routine)
Carnarvon Post Office	Australia	Record high maximum temperature	35.0 C (95.0 F)	22 of 100 (Routine)
Cape Leeuwin	Australia	Record high maximum temperature	26.1 C (79.0 F)	22 of 100 (Routine)
Red Hill South	Australia	Record daily precipitation	27.4 mm (1.1 in)	22 of 100 (Routine)
Mau	India	Record daily precipitation	58.7 mm (2.3 in)	22 of 100 (Routine)
Jerome	United States	Record low maximum temperature	21.1 C (70.0 F)	22 of 100 (Routine)
Wickenburg	United States	Record low maximum temperature	25.6 C (78.1 F)	22 of 100 (Routine)
Winamac 2SSE	United States	Record high maximum temperature	35.0 C (95.0 F)	22 of 100 (Routine)
Chariton 1 E	United States	Record high minimum temperature	23.9 C (75.0 F)	22 of 100 (Routine)
Rockwell City	United States	Record high minimum temperature	23.9 C (75.0 F)	22 of 100 (Routine)
Central Michigan UNIV	United States	Record daily precipitation	47.8 mm (1.9 in)	22 of 100 (Routine)
De Bilt	Netherlands	Record daily precipitation	28.0 mm (1.1 in)	21 of 100 (Routine)
Grand Canyon HQ	United States	Record low maximum temperature	16.1 C (61.0 F)	21 of 100 (Routine)
Yosemite Park HQ	United States	Record low maximum temperature	16.7 C (62.1 F)	21 of 100 (Routine)
Conception	United States	Record high minimum temperature	24.4 C (75.9 F)	21 of 100 (Routine)
Tecumseh 1S	United States	Record high minimum temperature	24.4 C (75.9 F)	21 of 100 (Routine)
Bolivar Wtr Wks	United States	Record high maximum temperature	37.2 C (99.0 F)	21 of 100 (Routine)
San Diego Wbo	United States	Record daily precipitation	7.6 mm (0.30 in)	20 of 100 (Routine)
Idaho City	United States	Record daily precipitation	17.0 mm (0.7 in)	20 of 100 (Routine)
Moroco East	Australia	Record daily precipitation	15.2 mm (0.6 in)	20 of 100 (Routine)
Yatchaw (Amaroo)	Australia	Record daily precipitation	23.6 mm (0.9 in)	20 of 100 (Routine)
Boisdale	Australia	Record daily precipitation	22.9 mm (0.9 in)	20 of 100 (Routine)
Redlands	United States	Record daily precipitation	10.4 mm (0.4 in)	20 of 100 (Routine)
Lakeview 2 NNW	United States	Record daily precipitation	14.5 mm (0.6 in)	20 of 100 (Routine)
Heyfield State School	Australia	Record daily precipitation	14.7 mm (0.6 in)	20 of 100 (Routine)
Maffra Shire Hall	Australia	Record daily precipitation	10.4 mm (0.4 in)	20 of 100 (Routine)
Tirrengower	Australia	Record daily precipitation	16.5 mm (0.6 in)	20 of 100 (Routine)
Neerim	Australia	Record daily precipitation	20.6 mm (0.8 in)	20 of 100 (Routine)
Glenlyon	Australia	Record daily precipitation	18.8 mm (0.7 in)	20 of 100 (Routine)
San Bernardino F S 226	United States	Record daily precipitation	4.3 mm (0.17 in)	20 of 100 (Routine)
Micurinsk	Russia	Record daily precipitation	13.9 mm (0.5 in)	20 of 100 (Routine)

Counts by Type and Timescale

702 records

Records set or tied on 12 September 1939 by type: Highest daily maximum 267, Lowest daily maximum 94, Highest daily minimum 183, Lowest daily minimum 18, Heaviest daily rainfall 140.

Records on 12 September 1939 by type
Record type	Records
Highest daily maximum	267
Lowest daily maximum	94
Highest daily minimum	183
Lowest daily minimum	18
Heaviest daily rainfall	140
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 12 September 1939 by timescale: all-time 0, monthly 20, daily 682.

How Much Records Were Beaten By

547 broken records

Margins by which the 547 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 55.7. Ties are not counted.

Top 20 by Significance

12 September 1939

Top 20 records on 12 September 1939 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
12 September 1939	Pendraka, IN	daily rain	63.5 mm (2.5 in)	54.9 mm (2.2 in)	36 years	44 of 100 (Notable)
12 September 1939	Mohawk, US	daily rain	25.4 mm (1.0 in)	25.4 mm (1.0 in)	38 years	44 of 100 (Notable)
12 September 1939	Dimapur, IN	daily rain	93.0 mm (3.7 in)	55.7 mm (2.2 in)	14 years	39 of 100 (Notable)
12 September 1939	Harrison 1 NNW, US	daily rain	43.2 mm (1.7 in)	23.1 mm (0.9 in)	37 years	38 of 100 (Notable)
12 September 1939	Ogden 2, US	daily rain	32.0 mm (1.3 in)	24.4 mm (1.0 in)	24 years	38 of 100 (Notable)
12 September 1939	Salome 6 SE, US	daily rain	27.9 mm (1.1 in)	18.8 mm (0.7 in)	28 years	37 of 100 (Notable)
12 September 1939	New London, US	daily rain	72.4 mm (2.9 in)	30.5 mm (1.2 in)	22 years	35 of 100 (Notable)
12 September 1939	Milan, IT	daily rain	59.2 mm (2.3 in)	4.8 mm (0.19 in)	76 years	34 of 100 (Routine)
12 September 1939	Big Rapids Wtp, US	daily rain	58.4 mm (2.3 in)	24.1 mm (0.9 in)	24 years	34 of 100 (Routine)
12 September 1939	Midland 2, US	daily rain	42.7 mm (1.7 in)	24.9 mm (1.0 in)	13 years	34 of 100 (Routine)
12 September 1939	Seligman, US	daily rain	43.2 mm (1.7 in)	22.1 mm (0.9 in)	20 years	33 of 100 (Routine)
12 September 1939	St George, US	monthly rain	36.6 mm (1.4 in)	4.6 mm (0.18 in)	29 years	29 of 100 (Routine)
12 September 1939	Sacaton, US	daily rain	37.8 mm (1.5 in)	23.1 mm (0.9 in)	12 years	28 of 100 (Routine)
12 September 1939	Sydney (Observatory Hill), AU	daily low min	5.6 C (42.1 F)	0.9 C (1.6 F)	54 years	27 of 100 (Routine)
12 September 1939	Colby, US	monthly high min	21.7 C (71.1 F)	0.6 C (1.1 F)	40 years	27 of 100 (Routine)
12 September 1939	Menasha, US	daily rain	71.1 mm (2.8 in)	21.3 mm (0.8 in)	24 years	27 of 100 (Routine)
12 September 1939	Woodside, AU	monthly rain	53.8 mm (2.1 in)	4.0 mm (0.16 in)	17 years	26 of 100 (Routine)
12 September 1939	Sambalpur, IN	daily rain	64.5 mm (2.5 in)	37.1 mm (1.5 in)	22 years	26 of 100 (Routine)
12 September 1939	Granite Reef Dam, US	daily low max	30.6 C (87.1 F)	3.3 C (5.9 F)	41 years	26 of 100 (Routine)
12 September 1939	Salome 6 SE, US	daily low max	25.0 C (77.0 F)	5.6 C (10.1 F)	29 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

1793 to 1939

Records set or tied on this calendar date in each year from 1793 to 1939. 1939 had 702 records.

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

Records on 09-12 in each year
Year	Records
1793	2
1809	1
1813	1
1814	2
1834	1
1837	2
1839	1
1847	1
1848	1
1854	4
1859	2
1860	2
1865	2
1866	1
1867	1
1868	2
1869	1
1872	2
1876	1
1878	1
1880	1
1881	1
1882	1
1884	2
1885	2
1886	1
1887	2
1888	2
1889	1
1891	4
1892	1
1893	4
1894	1
1895	5
1896	2
1897	3
1898	3
1899	4
1900	1
1901	5
1902	11
1903	18
1904	7
1905	8
1906	24
1907	11
1908	12
1909	11
1910	4
1911	15
1912	20
1913	12
1914	49
1915	71
1916	21
1917	231
1918	42
1919	69
1920	49
1921	60
1922	136
1923	33
1924	177
1925	443
1926	89
1927	339
1928	155
1929	118
1930	198
1931	648
1932	199
1933	360
1934	176
1935	441
1936	515
1937	318
1938	332
1939	702
1940	891
1941	172
1942	337
1943	544
1944	393
1945	414
1946	302
1947	596
1948	292
1949	512
1950	578
1951	399
1952	575
1953	515
1954	313
1955	457
1956	389
1957	727
1958	783
1959	536
1960	772
1961	750
1962	407
1963	466
1964	836
1965	459
1966	416
1967	510
1968	428
1969	558
1970	619
1971	593
1972	430
1973	588
1974	575
1975	1,102
1976	539
1977	524
1978	952
1979	765
1980	511
1981	424
1982	993
1983	915
1984	700
1985	876
1986	787
1987	686
1988	997
1989	1,313
1990	1,001
1991	672
1992	767
1993	798
1994	550
1995	532
1996	1,014
1997	737
1998	1,770
1999	938
2000	1,188
2001	797
2002	883
2003	830
2004	653
2005	1,032
2006	963
2007	776
2008	1,213
2009	876
2010	939
2011	988
2012	639
2013	1,066
2014	1,374
2015	704
2016	748
2017	1,114
2018	595
2019	884
2020	566
2021	513
2022	739
2023	844
2024	1,009
2025	433
2026	627

Download the Data

Data for records on 1939-09-12: 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 10	507
10 to 20	21
20 to 30	14
30 to 40	3
40 to 50	0
50 to 60	2