Weather Records on 15 September 1940

181 weather records were set or tied worldwide on 15 September 1940. Highest significance: Uman, UA.

Key Facts for 15 September 1940

On 15 September 1940, 181 weather records were set or tied at long-record stations worldwide.
37 were record highs and 89 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 3 monthly and 178 daily.
Uman set a daily record precipitation of 46.9 mm (1.8 in) on 15 September 1940.
Across 170 earlier years (1797 to 2026) the same calendar date averaged 414 records.

Record Map

181 stations

181 station records on 15 September 1940 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 15 September 1940: highest significance records shown on the map
Station	Country	Type	Value	Significance
Uman	Ukraine	Record daily precipitation	46.9 mm (1.8 in)	57 of 100 (Notable)
Hajipur	India	Record daily precipitation	117.3 mm (4.6 in)	47 of 100 (Notable)
Col du Grand St-Bernard	Switzerland	Record daily precipitation	64.0 mm (2.5 in)	40 of 100 (Notable)
Kilmashogue,Lowlands	South Africa	Record daily precipitation	34.0 mm (1.3 in)	35 of 100 (Notable)
Buffalo	United States	Record daily precipitation	39.9 mm (1.6 in)	35 of 100 (Notable)
Port Townsend	United States	Record high minimum temperature	16.1 C (61.0 F)	35 of 100 (Notable)
Gauhati Obsy	India	Record daily precipitation	114.6 mm (4.5 in)	31 of 100 (Routine)
Tuddal	Norway	Record daily precipitation	25.2 mm (1.0 in)	30 of 100 (Routine)
Gudauri	Georgia	Record daily precipitation	36.3 mm (1.4 in)	29 of 100 (Routine)
Saentis	Switzerland	Record daily precipitation	95.8 mm (3.8 in)	29 of 100 (Routine)
Zagreb-Gric	Croatia	Record daily precipitation	33.0 mm (1.3 in)	28 of 100 (Routine)
White Lake	United States	Record daily precipitation	32.0 mm (1.3 in)	27 of 100 (Routine)
Olekminsk	Russia	Record high minimum temperature	10.0 C (50.0 F)	26 of 100 (Routine)
Naalehu 14	United States	Record daily precipitation	28.4 mm (1.1 in)	25 of 100 (Routine)
Wilsons Promontory Lighthouse	Australia	Record daily precipitation	43.4 mm (1.7 in)	24 of 100 (Routine)
Cuero	United States	Record low minimum temperature	10.0 C (50.0 F)	24 of 100 (Routine)
Lockport 2SE	United States	Record daily precipitation	32.5 mm (1.3 in)	23 of 100 (Routine)
Shoshone 1 WNW	United States	Record high minimum temperature	18.3 C (64.9 F)	22 of 100 (Routine)
Camden 3 W	United States	Record low minimum temperature	10.0 C (50.0 F)	22 of 100 (Routine)
Mexia	United States	Record low minimum temperature	11.1 C (52.0 F)	22 of 100 (Routine)
Calhoun 2 N	United States	Record low minimum temperature	11.1 C (52.0 F)	21 of 100 (Routine)
Laurel	United States	Record low minimum temperature	11.1 C (52.0 F)	21 of 100 (Routine)
Gotska Sandon	Sweden	Record daily precipitation	24.6 mm (1.0 in)	20 of 100 (Routine)
Maryborough	Australia	Record daily precipitation	21.8 mm (0.9 in)	20 of 100 (Routine)
Mullaley (Garrawilla)	Australia	Record daily precipitation	14.5 mm (0.6 in)	20 of 100 (Routine)
Inskip Point Lighthouse	Australia	Record daily precipitation	22.9 mm (0.9 in)	20 of 100 (Routine)
Halle	Germany	Record daily precipitation	13.3 mm (0.5 in)	20 of 100 (Routine)
Osijek	Croatia	Record daily precipitation	23.5 mm (0.9 in)	20 of 100 (Routine)
Cape Capricorn Lighthouse	Australia	Record daily precipitation	22.9 mm (0.9 in)	20 of 100 (Routine)
Jakutsk	Russia	Record daily precipitation	7.8 mm (0.31 in)	20 of 100 (Routine)
Boreli	India	Record daily precipitation	77.7 mm (3.1 in)	20 of 100 (Routine)
Sion 2	Switzerland	Record daily precipitation	30.0 mm (1.2 in)	20 of 100 (Routine)
Tallahassee	United States	Record low minimum temperature	16.1 C (61.0 F)	20 of 100 (Routine)
Americus	United States	Record low minimum temperature	11.1 C (52.0 F)	20 of 100 (Routine)
St Ignace	United States	Record low maximum temperature	13.3 C (55.9 F)	20 of 100 (Routine)
Rowena (Bunna Bunna)	Australia	Record daily precipitation	5.1 mm (0.20 in)	19 of 100 (Routine)
Charduar	India	Record daily precipitation	73.9 mm (2.9 in)	19 of 100 (Routine)
Nikolaevsk-Na-Amure	Russia	Record low minimum temperature	-2.8 C (27.0 F)	19 of 100 (Routine)
Basel Binningen	Switzerland	Record daily precipitation	22.8 mm (0.9 in)	19 of 100 (Routine)
Hay Springs	United States	Record high minimum temperature	13.3 C (55.9 F)	19 of 100 (Routine)
Sloan 3 S	United States	Record low maximum temperature	21.7 C (71.1 F)	19 of 100 (Routine)
Eutawville	United States	Record low minimum temperature	11.1 C (52.0 F)	19 of 100 (Routine)
Cle Elum	United States	Record high minimum temperature	15.6 C (60.1 F)	19 of 100 (Routine)
Ljubljana Bezigrad	Slovenia	Record daily precipitation	58.6 mm (2.3 in)	18 of 100 (Routine)
East Anaconda	United States	Record daily precipitation	11.9 mm (0.5 in)	18 of 100 (Routine)
Waco	United States	Record low minimum temperature	13.3 C (55.9 F)	18 of 100 (Routine)
Eastman 1 W	United States	Record low minimum temperature	12.8 C (55.0 F)	17 of 100 (Routine)
Ft Gaines	United States	Record low minimum temperature	10.6 C (51.1 F)	17 of 100 (Routine)
Leakesville 6 WSW	United States	Record low minimum temperature	11.1 C (52.0 F)	17 of 100 (Routine)
Pearlington	United States	Record low minimum temperature	13.9 C (57.0 F)	17 of 100 (Routine)
Marshall	United States	Record low minimum temperature	3.9 C (39.0 F)	17 of 100 (Routine)
Southern Pines 2 W	United States	Record low minimum temperature	9.4 C (48.9 F)	17 of 100 (Routine)
Flatonia 4SE	United States	Record low minimum temperature	12.2 C (54.0 F)	17 of 100 (Routine)
Flint	United States	Record low minimum temperature	13.3 C (55.9 F)	17 of 100 (Routine)
Liberty	United States	Record low minimum temperature	11.7 C (53.1 F)	17 of 100 (Routine)
Maunawili Rch	United States	Record high maximum temperature	30.0 C (86.0 F)	17 of 100 (Routine)
Miriam Vale	Australia	Record daily precipitation	11.4 mm (0.4 in)	16 of 100 (Routine)
Steveston	Canada	Record high maximum temperature	27.2 C (81.0 F)	16 of 100 (Routine)
Tezpur	India	Record daily precipitation	52.6 mm (2.1 in)	16 of 100 (Routine)
Rjukan	Norway	Record daily precipitation	22.0 mm (0.9 in)	16 of 100 (Routine)

Counts by Type and Timescale

181 records

Records set or tied on 15 September 1940 by type: Highest daily maximum 12, Lowest daily maximum 11, Highest daily minimum 25, Lowest daily minimum 78, Heaviest daily rainfall 55.

Records on 15 September 1940 by type
Record type	Records
Highest daily maximum	12
Lowest daily maximum	11
Highest daily minimum	25
Lowest daily minimum	78
Heaviest daily rainfall	55
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 15 September 1940 by timescale: all-time 0, monthly 3, daily 178.

How Much Records Were Beaten By

147 broken records

Margins by which the 147 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 82.2. Ties are not counted.

Top 20 by Significance

15 September 1940

Top 20 records on 15 September 1940 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
15 September 1940	Uman, UA	daily rain	46.9 mm (1.8 in)	28.2 mm (1.1 in)	40 years	57 of 100 (Notable)
15 September 1940	Hajipur, IN	daily rain	117.3 mm (4.6 in)	82.2 mm (3.2 in)	35 years	47 of 100 (Notable)
15 September 1940	Col du Grand St-Bernard, CH	daily rain	64.0 mm (2.5 in)	36.5 mm (1.4 in)	27 years	40 of 100 (Notable)
15 September 1940	Kilmashogue,Lowlands, ZA	daily rain	34.0 mm (1.3 in)	25.9 mm (1.0 in)	15 years	35 of 100 (Notable)
15 September 1940	Buffalo, US	daily rain	39.9 mm (1.6 in)	10.4 mm (0.4 in)	53 years	35 of 100 (Notable)
15 September 1940	Port Townsend, US	daily high min	16.1 C (61.0 F)	3.3 C (5.9 F)	46 years	35 of 100 (Notable)
15 September 1940	Gauhati Obsy, IN	monthly rain	114.6 mm (4.5 in)	13.8 mm (0.5 in)	34 years	31 of 100 (Routine)
15 September 1940	Tuddal, NO	daily rain	25.2 mm (1.0 in)	13.7 mm (0.5 in)	34 years	30 of 100 (Routine)
15 September 1940	Gudauri, GE	daily rain	36.3 mm (1.4 in)	12.5 mm (0.5 in)	43 years	29 of 100 (Routine)
15 September 1940	Saentis, CH	monthly rain	95.8 mm (3.8 in)	13.7 mm (0.5 in)	25 years	29 of 100 (Routine)
15 September 1940	Zagreb-Gric, HR	daily rain	33.0 mm (1.3 in)	2.4 mm (0.09 in)	61 years	28 of 100 (Routine)
15 September 1940	White Lake, US	daily rain	32.0 mm (1.3 in)	19.8 mm (0.8 in)	13 years	27 of 100 (Routine)
15 September 1940	Olekminsk, RU	daily high min	10.0 C (50.0 F)	1.8 C (3.2 F)	57 years	26 of 100 (Routine)
15 September 1940	Naalehu 14, US	daily rain	28.4 mm (1.1 in)	22.3 mm (0.9 in)	26 years	25 of 100 (Routine)
15 September 1940	Wilsons Promontory Lighthouse, AU	daily rain	43.4 mm (1.7 in)	6.3 mm (0.25 in)	28 years	24 of 100 (Routine)
15 September 1940	Cuero, US	daily low min	10.0 C (50.0 F)	3.3 C (5.9 F)	38 years	24 of 100 (Routine)
15 September 1940	Lockport 2SE, US	daily rain	32.5 mm (1.3 in)	13.4 mm (0.5 in)	14 years	23 of 100 (Routine)
15 September 1940	Shoshone 1 WNW, US	daily high min	18.3 C (64.9 F)	5.0 C (9.0 F)	30 years	22 of 100 (Routine)
15 September 1940	Camden 3 W, US	daily low min	10.0 C (50.0 F)	2.8 C (5.0 F)	26 years	22 of 100 (Routine)
15 September 1940	Mexia, US	daily low min	11.1 C (52.0 F)	3.9 C (7.0 F)	27 years	22 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

1797 to 1940

Records set or tied on this calendar date in each year from 1797 to 1940. 1940 had 181 records.

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

Records on 09-15 in each year
Year	Records
1797	1
1803	1
1806	2
1810	1
1816	1
1818	1
1823	2
1833	1
1836	1
1837	2
1839	1
1841	1
1848	1
1850	1
1851	1
1854	2
1856	1
1857	1
1859	1
1864	1
1865	2
1866	1
1867	2
1868	1
1869	1
1872	1
1873	2
1876	2
1877	2
1880	1
1881	1
1882	6
1884	3
1885	4
1886	2
1887	3
1888	1
1889	5
1890	1
1894	4
1895	1
1897	1
1898	3
1899	3
1900	1
1901	12
1902	7
1903	31
1904	30
1905	16
1906	6
1907	7
1908	16
1909	16
1910	2
1911	40
1912	64
1913	43
1914	18
1915	94
1916	44
1917	50
1918	50
1919	52
1920	164
1921	122
1922	53
1923	193
1924	103
1925	112
1926	134
1927	539
1928	86
1929	99
1930	235
1931	422
1932	295
1933	322
1934	351
1935	463
1936	460
1937	337
1938	247
1939	1,098
1940	181
1941	276
1942	278
1943	360
1944	396
1945	418
1946	411
1947	621
1948	557
1949	523
1950	750
1951	283
1952	455
1953	400
1954	518
1955	532
1956	646
1957	449
1958	294
1959	844
1960	410
1961	586
1962	557
1963	455
1964	839
1965	614
1966	534
1967	578
1968	429
1969	362
1970	1,157
1971	598
1972	356
1973	774
1974	386
1975	739
1976	667
1977	400
1978	628
1979	1,022
1980	563
1981	613
1982	1,315
1983	756
1984	766
1985	764
1986	928
1987	719
1988	818
1989	955
1990	911
1991	1,165
1992	919
1993	2,227
1994	1,363
1995	723
1996	1,212
1997	1,177
1998	1,768
1999	858
2000	1,175
2001	837
2002	1,212
2003	855
2004	893
2005	1,123
2006	1,042
2007	946
2008	1,153
2009	773
2010	913
2011	1,170
2012	568
2013	854
2014	443
2015	997
2016	988
2017	825
2018	874
2019	538
2020	785
2021	467
2022	392
2023	507
2024	681
2025	503
2026	779

Download the Data

Data for records on 1940-09-15: 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	141
20 to 40	5
40 to 60	0
60 to 80	0
80 to 100	1