Weather Records on 17 September 1940

326 weather records were set or tied worldwide on 17 September 1940. Highest significance: St George, US.

Key Facts for 17 September 1940

On 17 September 1940, 326 weather records were set or tied at long-record stations worldwide.
117 were record highs and 59 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 5 monthly and 321 daily.
St George set a daily record precipitation of 26.7 mm (1.1 in) on 17 September 1940.
Across 164 earlier years (1796 to 2026) the same calendar date averaged 423 records.

Record Map

326 stations

326 station records on 17 September 1940 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 September 1940: highest significance records shown on the map
Station	Country	Type	Value	Significance
St George	United States	Record daily precipitation	26.7 mm (1.1 in)	56 of 100 (Notable)
Uman	Ukraine	Record daily precipitation	39.4 mm (1.6 in)	53 of 100 (Notable)
Waiopai Rch 256	United States	Record daily precipitation	107.4 mm (4.2 in)	53 of 100 (Notable)
Kualapuu 534	United States	Record daily precipitation	37.3 mm (1.5 in)	52 of 100 (Notable)
Manikpur	India	Record daily precipitation	139.7 mm (5.5 in)	50 of 100 (Notable)
Hana 354	United States	Record daily precipitation	52.1 mm (2.1 in)	47 of 100 (Notable)
Mesa	United States	Record low maximum temperature	25.0 C (77.0 F)	46 of 100 (Notable)
Kakinada	India	Record daily precipitation	96.0 mm (3.8 in)	45 of 100 (Notable)
Gorki	Belarus	Record daily precipitation	29.7 mm (1.2 in)	44 of 100 (Notable)
Escalante	United States	Record daily precipitation	34.3 mm (1.4 in)	43 of 100 (Notable)
Pithapuram	India	Record daily precipitation	111.8 mm (4.4 in)	39 of 100 (Notable)
Parker	United States	Record daily precipitation	32.3 mm (1.3 in)	39 of 100 (Notable)
Kiev	Ukraine	Record daily precipitation	52.3 mm (2.1 in)	38 of 100 (Notable)
Cairo Ezbekiya	Egypt	Record high maximum temperature	39.7 C (103.5 F)	37 of 100 (Notable)
Sanehighat	India	Record daily precipitation	111.8 mm (4.4 in)	37 of 100 (Notable)
Chodavaram	India	Record daily precipitation	88.9 mm (3.5 in)	36 of 100 (Notable)
Tempe 3 S	United States	Record low maximum temperature	26.1 C (79.0 F)	36 of 100 (Notable)
Kingman	United States	Record daily precipitation	33.5 mm (1.3 in)	34 of 100 (Routine)
Saunur(Savnur)	India	Record daily precipitation	52.1 mm (2.1 in)	32 of 100 (Routine)
Kovvur	India	Record daily precipitation	103.1 mm (4.1 in)	31 of 100 (Routine)
Ft Valley	United States	Record low maximum temperature	11.7 C (53.1 F)	31 of 100 (Routine)
Prathipadu	India	Record daily precipitation	83.8 mm (3.3 in)	28 of 100 (Routine)
Bijawar	India	Record daily precipitation	80.0 mm (3.1 in)	28 of 100 (Routine)
Orderville	United States	Record daily precipitation	43.9 mm (1.7 in)	28 of 100 (Routine)
Jerome	United States	Record low maximum temperature	15.6 C (60.1 F)	27 of 100 (Routine)
Sacaton	United States	Record low maximum temperature	26.7 C (80.1 F)	27 of 100 (Routine)
Brawley 2 SW	United States	Record low maximum temperature	27.8 C (82.0 F)	26 of 100 (Routine)
Two Harbors	United States	Record daily precipitation	46.2 mm (1.8 in)	26 of 100 (Routine)
Khannah	India	Record daily precipitation	63.5 mm (2.5 in)	25 of 100 (Routine)
Ekaterinburg	Russia	Record high minimum temperature	13.8 C (56.8 F)	25 of 100 (Routine)
Kalgoorlie Post Office	Australia	Record high minimum temperature	18.1 C (64.6 F)	24 of 100 (Routine)
Parrsboro	Canada	Record daily precipitation	47.0 mm (1.9 in)	24 of 100 (Routine)
Shahjahanpur	India	Record daily precipitation	139.2 mm (5.5 in)	24 of 100 (Routine)
Polavaram	India	Record daily precipitation	77.5 mm (3.1 in)	23 of 100 (Routine)
Mandla	India	Record daily precipitation	41.7 mm (1.6 in)	23 of 100 (Routine)
Holbrook	United States	Record low maximum temperature	20.0 C (68.0 F)	23 of 100 (Routine)
Indio Fire STN	United States	Record low maximum temperature	30.6 C (87.1 F)	23 of 100 (Routine)
Alamogordo 1	United States	Record high minimum temperature	21.1 C (70.0 F)	23 of 100 (Routine)
Robe Comparison	Australia	Record low minimum temperature	4.1 C (39.4 F)	22 of 100 (Routine)
Dunvegan	Canada	Record high minimum temperature	8.9 C (48.0 F)	22 of 100 (Routine)
Raichur	India	Record daily precipitation	61.5 mm (2.4 in)	22 of 100 (Routine)
Elatma	Russia	Record high minimum temperature	14.7 C (58.5 F)	22 of 100 (Routine)
Granite Reef Dam	United States	Record low maximum temperature	25.0 C (77.0 F)	22 of 100 (Routine)
Whiteriver 1 SW	United States	Record high minimum temperature	15.6 C (60.1 F)	22 of 100 (Routine)
Escalante	United States	Record low maximum temperature	13.3 C (55.9 F)	22 of 100 (Routine)
Raiford State Prison	United States	Record low minimum temperature	15.6 C (60.1 F)	21 of 100 (Routine)
Big Creek	Canada	Record daily precipitation	18.0 mm (0.7 in)	20 of 100 (Routine)
Mohawk	United States	Record daily precipitation	18.3 mm (0.7 in)	20 of 100 (Routine)
Beech Creek	United States	Record daily precipitation	13.7 mm (0.5 in)	20 of 100 (Routine)
Paragonah	United States	Record daily precipitation	23.6 mm (0.9 in)	20 of 100 (Routine)
Nidingen A	Sweden	Record daily precipitation	17.9 mm (0.7 in)	20 of 100 (Routine)
McGill	United States	Record daily precipitation	5.8 mm (0.23 in)	20 of 100 (Routine)
Fillmore	United States	Record daily precipitation	12.2 mm (0.5 in)	20 of 100 (Routine)
Colfax	United States	Record daily precipitation	12.7 mm (0.5 in)	20 of 100 (Routine)
Las Vegas	United States	Record daily precipitation	8.9 mm (0.35 in)	20 of 100 (Routine)
Vernal	United States	Record daily precipitation	11.2 mm (0.4 in)	20 of 100 (Routine)
Cloverdale	United States	Record daily precipitation	23.9 mm (0.9 in)	20 of 100 (Routine)
Blanding	United States	Record daily precipitation	20.6 mm (0.8 in)	20 of 100 (Routine)
Manti	United States	Record daily precipitation	13.7 mm (0.5 in)	20 of 100 (Routine)
Vestervig	Denmark	Record daily precipitation	24.6 mm (1.0 in)	20 of 100 (Routine)

Counts by Type and Timescale

326 records

Records set or tied on 17 September 1940 by type: Highest daily maximum 44, Lowest daily maximum 37, Highest daily minimum 73, Lowest daily minimum 22, Heaviest daily rainfall 150.

Records on 17 September 1940 by type
Record type	Records
Highest daily maximum	44
Lowest daily maximum	37
Highest daily minimum	73
Lowest daily minimum	22
Heaviest daily rainfall	150
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 17 September 1940 by timescale: all-time 0, monthly 5, daily 321.

How Much Records Were Beaten By

256 broken records

Margins by which the 256 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 113.3. Ties are not counted.

Top 20 by Significance

17 September 1940

Top 20 records on 17 September 1940 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 September 1940	St George, US	daily rain	26.7 mm (1.1 in)	26.2 mm (1.0 in)	44 years	56 of 100 (Notable)
17 September 1940	Uman, UA	daily rain	39.4 mm (1.6 in)	30.3 mm (1.2 in)	29 years	53 of 100 (Notable)
17 September 1940	Waiopai Rch 256, US	daily rain	107.4 mm (4.2 in)	107.4 mm (4.2 in)	35 years	53 of 100 (Notable)
17 September 1940	Kualapuu 534, US	daily rain	37.3 mm (1.5 in)	25.4 mm (1.0 in)	30 years	52 of 100 (Notable)
17 September 1940	Manikpur, IN	daily rain	139.7 mm (5.5 in)	113.3 mm (4.5 in)	25 years	50 of 100 (Notable)
17 September 1940	Hana 354, US	daily rain	52.1 mm (2.1 in)	44.5 mm (1.8 in)	15 years	47 of 100 (Notable)
17 September 1940	Mesa, US	daily low max	25.0 C (77.0 F)	9.4 C (16.9 F)	42 years	46 of 100 (Notable)
17 September 1940	Kakinada, IN	daily rain	96.0 mm (3.8 in)	51.3 mm (2.0 in)	37 years	45 of 100 (Notable)
17 September 1940	Gorki, BY	daily rain	29.7 mm (1.2 in)	17.8 mm (0.7 in)	25 years	44 of 100 (Notable)
17 September 1940	Escalante, US	daily rain	34.3 mm (1.4 in)	33.5 mm (1.3 in)	36 years	43 of 100 (Notable)
17 September 1940	Pithapuram, IN	daily rain	111.8 mm (4.4 in)	41.7 mm (1.6 in)	37 years	39 of 100 (Notable)
17 September 1940	Parker, US	daily rain	32.3 mm (1.3 in)	32.3 mm (1.3 in)	45 years	39 of 100 (Notable)
17 September 1940	Kiev, UA	daily rain	52.3 mm (2.1 in)	22.0 mm (0.9 in)	15 years	38 of 100 (Notable)
17 September 1940	Cairo Ezbekiya, EG	daily high max	39.7 C (103.5 F)	5.7 C (10.3 F)	28 years	37 of 100 (Notable)
17 September 1940	Sanehighat, IN	daily rain	111.8 mm (4.4 in)	89.2 mm (3.5 in)	16 years	37 of 100 (Notable)
17 September 1940	Chodavaram, IN	daily rain	88.9 mm (3.5 in)	50.8 mm (2.0 in)	23 years	36 of 100 (Notable)
17 September 1940	Tempe 3 S, US	daily low max	26.1 C (79.0 F)	7.8 C (14.0 F)	34 years	36 of 100 (Notable)
17 September 1940	Kingman, US	daily rain	33.5 mm (1.3 in)	32.7 mm (1.3 in)	11 years	34 of 100 (Routine)
17 September 1940	Saunur(Savnur), IN	daily rain	52.1 mm (2.1 in)	26.7 mm (1.1 in)	9 years	32 of 100 (Routine)
17 September 1940	Kovvur, IN	daily rain	103.1 mm (4.1 in)	44.7 mm (1.8 in)	23 years	31 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

1796 to 1940

Records set or tied on this calendar date in each year from 1796 to 1940. 1940 had 326 records.

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

Records on 09-17 in each year
Year	Records
1796	1
1797	1
1805	1
1833	1
1834	1
1837	2
1845	1
1847	3
1848	1
1850	1
1851	2
1853	2
1854	2
1859	1
1862	1
1867	1
1870	1
1871	1
1872	1
1873	1
1874	1
1875	1
1877	1
1881	1
1882	2
1884	3
1885	3
1886	6
1888	2
1889	8
1891	1
1893	3
1894	1
1895	4
1896	9
1897	4
1898	7
1899	1
1900	4
1901	5
1902	5
1903	28
1904	2
1905	17
1906	10
1907	15
1908	13
1909	7
1910	38
1911	15
1912	17
1913	28
1914	38
1915	48
1916	40
1917	255
1918	41
1919	21
1920	40
1921	66
1922	47
1923	159
1924	80
1925	338
1926	154
1927	420
1928	78
1929	168
1930	147
1931	564
1932	425
1933	415
1934	246
1935	321
1936	219
1937	463
1938	363
1939	294
1940	326
1941	328
1942	581
1943	513
1944	403
1945	614
1946	620
1947	680
1948	630
1949	292
1950	412
1951	359
1952	263
1953	344
1954	449
1955	649
1956	437
1957	405
1958	806
1959	1,210
1960	385
1961	657
1962	432
1963	297
1964	559
1965	1,394
1966	523
1967	331
1968	691
1969	352
1970	412
1971	898
1972	556
1973	638
1974	491
1975	478
1976	636
1977	641
1978	764
1979	804
1980	794
1981	1,155
1982	606
1983	862
1984	1,006
1985	448
1986	1,314
1987	926
1988	982
1989	863
1990	650
1991	1,407
1992	686
1993	950
1994	986
1995	1,145
1996	1,342
1997	1,057
1998	1,137
1999	1,102
2000	1,318
2001	895
2002	1,025
2003	586
2004	872
2005	1,042
2006	1,344
2007	752
2008	886
2009	871
2010	907
2011	1,116
2012	597
2013	1,253
2014	571
2015	953
2016	707
2017	455
2018	899
2019	774
2020	651
2021	345
2022	313
2023	646
2024	954
2025	634
2026	968

Download the Data

Data for records on 1940-09-17: 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	227
20 to 40	21
40 to 60	5
60 to 80	0
80 to 100	1
100 to 120	2