Weather Records on 4 September 1939

434 weather records were set or tied worldwide on 4 September 1939. Highest significance: Heyfield State School, AU.

Key Facts for 4 September 1939

On 4 September 1939, 434 weather records were set or tied at long-record stations worldwide.
259 were record highs and 45 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 32 monthly and 401 daily.
Heyfield State School set a daily record precipitation of 38.4 mm (1.5 in) on 4 September 1939.
Across 165 earlier years (1802 to 2026) the same calendar date averaged 451 records.

Record Map

434 stations

434 station records on 4 September 1939 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 4 September 1939: highest significance records shown on the map
Station	Country	Type	Value	Significance
Heyfield State School	Australia	Record daily precipitation	38.4 mm (1.5 in)	53 of 100 (Notable)
Washington	United States	Record daily precipitation	114.0 mm (4.5 in)	46 of 100 (Notable)
Moanalua 770	United States	Record daily precipitation	65.5 mm (2.6 in)	45 of 100 (Notable)
Waimanalo 794	United States	Record daily precipitation	67.6 mm (2.7 in)	45 of 100 (Notable)
Ulm	Germany	Record daily precipitation	34.2 mm (1.3 in)	43 of 100 (Notable)
Augsburg (Sankt Stephan)	Germany	Record daily precipitation	70.9 mm (2.8 in)	41 of 100 (Notable)
Kotkhai	India	Record daily precipitation	63.0 mm (2.5 in)	40 of 100 (Notable)
Tucson WFO	United States	Record daily precipitation	30.0 mm (1.2 in)	39 of 100 (Notable)
Holland Wtp	United States	Record daily precipitation	58.4 mm (2.3 in)	39 of 100 (Notable)
Needles	United States	Record daily precipitation	30.0 mm (1.2 in)	37 of 100 (Notable)
Buckeye	United States	Record daily precipitation	57.7 mm (2.3 in)	35 of 100 (Notable)
West Newton	United States	Record daily precipitation	63.5 mm (2.5 in)	34 of 100 (Routine)
Ellwangen-Rindelbach	Germany	Record daily precipitation	37.0 mm (1.5 in)	33 of 100 (Routine)
Hata	India	Record daily precipitation	94.5 mm (3.7 in)	33 of 100 (Routine)
Lugano	Switzerland	Record daily precipitation	75.0 mm (3.0 in)	33 of 100 (Routine)
Fond du Lac Wwtp	United States	Record daily precipitation	46.0 mm (1.8 in)	32 of 100 (Routine)
Howell Wwtp	United States	Record daily precipitation	42.2 mm (1.7 in)	31 of 100 (Routine)
Yuma Wb City	United States	Record daily precipitation	55.1 mm (2.2 in)	31 of 100 (Routine)
Nagla	India	Record daily precipitation	128.3 mm (5.1 in)	30 of 100 (Routine)
Aiea Fld 764A	United States	Record daily precipitation	27.4 mm (1.1 in)	30 of 100 (Routine)
Wickenburg	United States	Record daily precipitation	27.4 mm (1.1 in)	29 of 100 (Routine)
Keanae 346	United States	Record daily precipitation	109.5 mm (4.3 in)	29 of 100 (Routine)
Maunawili Rch	United States	Record daily precipitation	66.0 mm (2.6 in)	29 of 100 (Routine)
Lindsay	Canada	Record daily precipitation	46.5 mm (1.8 in)	28 of 100 (Routine)
Dataganj	India	Record daily precipitation	81.8 mm (3.2 in)	28 of 100 (Routine)
McAlester Rgnl AP	United States	Record high minimum temperature	28.9 C (84.0 F)	28 of 100 (Routine)
Tranebjerg	Denmark	Record high minimum temperature	15.7 C (60.3 F)	27 of 100 (Routine)
Seodha(Seondha)	India	Record daily precipitation	105.4 mm (4.1 in)	27 of 100 (Routine)
Conway	United States	Record high maximum temperature	43.3 C (109.9 F)	27 of 100 (Routine)
Bolivar Wtr Wks	United States	Record high maximum temperature	38.9 C (102.0 F)	27 of 100 (Routine)
Pembroke Eddy Match	Canada	Record daily precipitation	29.2 mm (1.1 in)	26 of 100 (Routine)
Appleton	United States	Record daily precipitation	44.2 mm (1.7 in)	26 of 100 (Routine)
Karlsruhe	Germany	Record daily precipitation	32.1 mm (1.3 in)	25 of 100 (Routine)
Bogoroditskoye-Fenino	Russia	Record low minimum temperature	1.0 C (33.8 F)	25 of 100 (Routine)
Haparanda	Sweden	Record high maximum temperature	19.8 C (67.6 F)	25 of 100 (Routine)
Mohawk	United States	Record daily precipitation	25.4 mm (1.0 in)	25 of 100 (Routine)
Shahjahanpur	India	Record daily precipitation	112.3 mm (4.4 in)	24 of 100 (Routine)
Kazan	Russia	Record low minimum temperature	0.1 C (32.2 F)	24 of 100 (Routine)
Orebro	Sweden	Record high maximum temperature	22.8 C (73.0 F)	24 of 100 (Routine)
Stillwater 2 W	United States	Record high maximum temperature	42.2 C (108.0 F)	24 of 100 (Routine)
Minsk	Belarus	Record low minimum temperature	1.8 C (35.2 F)	23 of 100 (Routine)
Wickenburg	United States	Record low maximum temperature	27.8 C (82.0 F)	23 of 100 (Routine)
Muskegon Co AP	United States	Record daily precipitation	37.8 mm (1.5 in)	23 of 100 (Routine)
Inverell Comparison	Australia	Record low minimum temperature	-4.4 C (24.1 F)	22 of 100 (Routine)
Fort Macleod	Canada	Record high minimum temperature	17.8 C (64.0 F)	22 of 100 (Routine)
Beatrice	Canada	Record high minimum temperature	18.3 C (64.9 F)	22 of 100 (Routine)
Brucefield	Canada	Record high minimum temperature	22.8 C (73.0 F)	22 of 100 (Routine)
Ottawa 4SW	United States	Record high minimum temperature	26.1 C (79.0 F)	22 of 100 (Routine)
Salem	United States	Record high minimum temperature	24.4 C (75.9 F)	22 of 100 (Routine)
Marshall	United States	Record high minimum temperature	26.7 C (80.1 F)	22 of 100 (Routine)
Clarendon	United States	Record high minimum temperature	23.9 C (75.0 F)	22 of 100 (Routine)
Bhind	India	Record daily precipitation	101.6 mm (4.0 in)	21 of 100 (Routine)
Fayetteville Exp STN	United States	Record high maximum temperature	39.4 C (102.9 F)	21 of 100 (Routine)
Kalamazoo State Hospital	United States	Record daily precipitation	38.9 mm (1.5 in)	21 of 100 (Routine)
Escalante	United States	Record low maximum temperature	16.1 C (61.0 F)	21 of 100 (Routine)
Brockville	Canada	Record daily precipitation	19.6 mm (0.8 in)	20 of 100 (Routine)
Deal Island	Australia	Record daily precipitation	19.6 mm (0.8 in)	20 of 100 (Routine)
Simferopol	Ukraine	Record daily precipitation	18.6 mm (0.7 in)	20 of 100 (Routine)
Salome 6 SE	United States	Record daily precipitation	22.9 mm (0.9 in)	20 of 100 (Routine)
Gila Bend 2SE	United States	Record daily precipitation	12.2 mm (0.5 in)	20 of 100 (Routine)

Counts by Type and Timescale

434 records

Records set or tied on 4 September 1939 by type: Highest daily maximum 99, Lowest daily maximum 14, Highest daily minimum 160, Lowest daily minimum 31, Heaviest daily rainfall 130.

Records on 4 September 1939 by type
Record type	Records
Highest daily maximum	99
Lowest daily maximum	14
Highest daily minimum	160
Lowest daily minimum	31
Heaviest daily rainfall	130
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 4 September 1939 by timescale: all-time 1, monthly 32, daily 401.

How Much Records Were Beaten By

328 broken records

Margins by which the 328 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 75.2. Ties are not counted.

Top 20 by Significance

4 September 1939

Top 20 records on 4 September 1939 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
4 September 1939	Heyfield State School, AU	daily rain	38.4 mm (1.5 in)	32.6 mm (1.3 in)	28 years	53 of 100 (Notable)
4 September 1939	Washington, US	daily rain	114.0 mm (4.5 in)	62.4 mm (2.5 in)	4 years	46 of 100 (Notable)
4 September 1939	Moanalua 770, US	daily rain	65.5 mm (2.6 in)	59.9 mm (2.4 in)	6 years	45 of 100 (Notable)
4 September 1939	Waimanalo 794, US	daily rain	67.6 mm (2.7 in)	35.3 mm (1.4 in)	8 years	45 of 100 (Notable)
4 September 1939	Ulm, DE	daily rain	34.2 mm (1.3 in)	19.0 mm (0.7 in)	24 years	43 of 100 (Notable)
4 September 1939	Augsburg (Sankt Stephan), DE	all-time rain	70.9 mm (2.8 in)	4.6 mm (0.18 in)	27 years	41 of 100 (Notable)
4 September 1939	Kotkhai, IN	daily rain	63.0 mm (2.5 in)	57.9 mm (2.3 in)	29 years	40 of 100 (Notable)
4 September 1939	Tucson WFO, US	daily rain	30.0 mm (1.2 in)	26.4 mm (1.0 in)	18 years	39 of 100 (Notable)
4 September 1939	Holland Wtp, US	daily rain	58.4 mm (2.3 in)	35.0 mm (1.4 in)	33 years	39 of 100 (Notable)
4 September 1939	Needles, US	daily rain	30.0 mm (1.2 in)	19.6 mm (0.8 in)	29 years	37 of 100 (Notable)
4 September 1939	Buckeye, US	daily rain	57.7 mm (2.3 in)	47.0 mm (1.9 in)	20 years	35 of 100 (Notable)
4 September 1939	West Newton, US	monthly rain	63.5 mm (2.5 in)	8.1 mm (0.32 in)	42 years	34 of 100 (Routine)
4 September 1939	Ellwangen-Rindelbach, DE	daily rain	37.0 mm (1.5 in)	20.6 mm (0.8 in)	4 years	33 of 100 (Routine)
4 September 1939	Hata, IN	daily rain	94.5 mm (3.7 in)	54.9 mm (2.2 in)	37 years	33 of 100 (Routine)
4 September 1939	Lugano, CH	daily rain	75.0 mm (3.0 in)	51.6 mm (2.0 in)	8 years	33 of 100 (Routine)
4 September 1939	Fond du Lac Wwtp, US	daily rain	46.0 mm (1.8 in)	21.9 mm (0.9 in)	26 years	32 of 100 (Routine)
4 September 1939	Howell Wwtp, US	daily rain	42.2 mm (1.7 in)	21.9 mm (0.9 in)	20 years	31 of 100 (Routine)
4 September 1939	Yuma Wb City, US	daily rain	55.1 mm (2.2 in)	31.0 mm (1.2 in)	29 years	31 of 100 (Routine)
4 September 1939	Nagla, IN	daily rain	128.3 mm (5.1 in)	75.2 mm (3.0 in)	28 years	30 of 100 (Routine)
4 September 1939	Aiea Fld 764A, US	daily rain	27.4 mm (1.1 in)	16.7 mm (0.7 in)	20 years	30 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

1802 to 1939

Records set or tied on this calendar date in each year from 1802 to 1939. 1939 had 434 records.

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

Records on 09-04 in each year
Year	Records
1802	1
1805	1
1823	1
1833	1
1837	1
1839	1
1845	1
1847	1
1850	1
1854	1
1856	1
1857	1
1858	1
1861	1
1863	1
1864	1
1867	1
1868	1
1869	2
1871	1
1872	4
1874	1
1875	1
1877	1
1880	4
1881	1
1883	2
1885	3
1887	1
1888	2
1889	1
1890	1
1891	5
1894	4
1895	6
1896	1
1897	4
1898	9
1899	4
1900	1
1901	4
1902	4
1903	2
1904	7
1905	18
1906	16
1907	22
1908	9
1909	23
1910	91
1911	25
1912	29
1913	29
1914	19
1915	37
1916	24
1917	40
1918	96
1919	48
1920	105
1921	105
1922	62
1923	325
1924	167
1925	339
1926	256
1927	68
1928	341
1929	371
1930	102
1931	477
1932	429
1933	424
1934	393
1935	514
1936	309
1937	411
1938	236
1939	434
1940	287
1941	528
1942	323
1943	472
1944	341
1945	542
1946	431
1947	618
1948	409
1949	370
1950	642
1951	404
1952	645
1953	869
1954	372
1955	465
1956	586
1957	250
1958	384
1959	316
1960	552
1961	909
1962	733
1963	443
1964	507
1965	611
1966	428
1967	786
1968	546
1969	510
1970	644
1971	717
1972	513
1973	530
1974	2,279
1975	432
1976	582
1977	386
1978	940
1979	461
1980	355
1981	582
1982	617
1983	1,040
1984	1,107
1985	915
1986	663
1987	685
1988	1,259
1989	681
1990	787
1991	708
1992	1,132
1993	859
1994	1,001
1995	1,287
1996	907
1997	1,452
1998	1,564
1999	1,479
2000	1,336
2001	833
2002	767
2003	1,094
2004	898
2005	998
2006	1,268
2007	1,077
2008	1,335
2009	914
2010	1,804
2011	1,310
2012	1,209
2013	630
2014	461
2015	893
2016	597
2017	881
2018	758
2019	616
2020	957
2021	544
2022	1,256
2023	1,290
2024	985
2025	635
2026	1,222

Download the Data

Data for records on 1939-09-04: 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	271
10 to 20	22
20 to 30	15
30 to 40	8
40 to 50	3
50 to 60	6
60 to 70	2
70 to 80	1