Weather Records on 11 September 1917

88 weather records were set or tied worldwide on 11 September 1917. Highest significance: Beachport, AU.

Key Facts for 11 September 1917

On 11 September 1917, 88 weather records were set or tied at long-record stations worldwide.
7 were record highs and 64 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 0 monthly and 88 daily.
Beachport set a daily record precipitation of 27.9 mm (1.1 in) on 11 September 1917.
Across 164 earlier years (1809 to 2026) the same calendar date averaged 426 records.

Record Map

88 stations

88 station records on 11 September 1917 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 11 September 1917: highest significance records shown on the map
Station	Country	Type	Value	Significance
Beachport	Australia	Record daily precipitation	27.9 mm (1.1 in)	50 of 100 (Notable)
Tempe Downs	Australia	Record daily precipitation	33.3 mm (1.3 in)	45 of 100 (Notable)
Middletown 4 W	United States	Record low minimum temperature	-2.8 C (27.0 F)	27 of 100 (Routine)
Morgantown 1	United States	Record low minimum temperature	1.1 C (34.0 F)	27 of 100 (Routine)
Newark Liberty Intl AP	United States	Record low minimum temperature	7.2 C (45.0 F)	26 of 100 (Routine)
Washington	United States	Record low minimum temperature	4.4 C (39.9 F)	26 of 100 (Routine)
Brinkworth (Bungaree)	Australia	Record daily precipitation	36.8 mm (1.4 in)	24 of 100 (Routine)
Baltimore Customs House	United States	Record low minimum temperature	6.1 C (43.0 F)	24 of 100 (Routine)
Middletown 4 W	United States	Record low maximum temperature	14.4 C (57.9 F)	23 of 100 (Routine)
World Trade Ctr	United States	Record low minimum temperature	6.1 C (43.0 F)	23 of 100 (Routine)
Jacksonville Wb City	United States	Record low maximum temperature	23.9 C (75.0 F)	23 of 100 (Routine)
Ny City Cntrl Park	United States	Record low minimum temperature	6.1 C (43.0 F)	23 of 100 (Routine)
Algiers-Ville/Universite	Algeria	Record high maximum temperature	39.0 C (102.2 F)	22 of 100 (Routine)
Port Dover	Canada	Record low minimum temperature	1.1 C (34.0 F)	22 of 100 (Routine)
Atlantic City Marina	United States	Record low minimum temperature	6.7 C (44.1 F)	22 of 100 (Routine)
Philadelphia City	United States	Record low minimum temperature	6.1 C (43.0 F)	21 of 100 (Routine)
Lexington Bluegrass AP	United States	Record low minimum temperature	5.6 C (42.1 F)	21 of 100 (Routine)
Cape Northumberland	Australia	Record daily precipitation	24.1 mm (0.9 in)	20 of 100 (Routine)
Murray Town (Doughboy Creek)	Australia	Record daily precipitation	21.6 mm (0.9 in)	20 of 100 (Routine)
Swift Current	Canada	Record daily precipitation	13.7 mm (0.5 in)	20 of 100 (Routine)
McKinlay Roadhouse	Australia	Record daily precipitation	10.2 mm (0.4 in)	20 of 100 (Routine)
Portland	United States	Record low minimum temperature	3.9 C (39.0 F)	20 of 100 (Routine)
Cape May 2 NW	United States	Record low minimum temperature	5.6 C (42.1 F)	20 of 100 (Routine)
Concord	United States	Record low minimum temperature	-0.6 C (30.9 F)	19 of 100 (Routine)
Kingston Queens U	Canada	Record low maximum temperature	15.0 C (59.0 F)	18 of 100 (Routine)
Lexington Bluegrass AP	United States	Record low maximum temperature	16.7 C (62.1 F)	18 of 100 (Routine)
Gilbert River Post Office	Australia	Record daily precipitation	0.8 mm (0.03 in)	17 of 100 (Routine)
Southampton	Canada	Record low maximum temperature	14.4 C (57.9 F)	17 of 100 (Routine)
Guelph Oac	Canada	Record low maximum temperature	13.3 C (55.9 F)	17 of 100 (Routine)
World Trade Ctr	United States	Record low maximum temperature	15.6 C (60.1 F)	17 of 100 (Routine)
Toledo Blade	United States	Record low minimum temperature	4.4 C (39.9 F)	17 of 100 (Routine)
State College	United States	Record low minimum temperature	0.0 C (32.0 F)	17 of 100 (Routine)
Milwaukee Wb City	United States	Record low minimum temperature	5.0 C (41.0 F)	17 of 100 (Routine)
Owen Sound	Canada	Record low maximum temperature	13.9 C (57.0 F)	16 of 100 (Routine)
Quebec	Canada	Record low minimum temperature	1.7 C (35.1 F)	16 of 100 (Routine)
Yarmouth	Canada	Record low maximum temperature	12.8 C (55.0 F)	16 of 100 (Routine)
Fir Glen	South Africa	Record daily precipitation	29.5 mm (1.2 in)	16 of 100 (Routine)
Wilmington Wb City	United States	Record low minimum temperature	12.2 C (54.0 F)	16 of 100 (Routine)
Musgrave	Australia	Record daily precipitation	4.3 mm (0.17 in)	15 of 100 (Routine)
Alton	Canada	Record low maximum temperature	10.6 C (51.1 F)	15 of 100 (Routine)
Fredericton Unb	Canada	Record low minimum temperature	0.0 C (32.0 F)	15 of 100 (Routine)
Setauket Strong	United States	Record low maximum temperature	15.6 C (60.1 F)	15 of 100 (Routine)
Cleveland 2717 Euclid	United States	Record low maximum temperature	13.3 C (55.9 F)	15 of 100 (Routine)
Maneroo	Australia	Record daily precipitation	2.3 mm (0.09 in)	14 of 100 (Routine)
Second Valley (Spring Grove)	Australia	Record daily precipitation	17.3 mm (0.7 in)	13 of 100 (Routine)
Port Stanley	Canada	Record low minimum temperature	0.0 C (32.0 F)	13 of 100 (Routine)
Anticosti SW Point	Canada	Record low maximum temperature	7.2 C (45.0 F)	13 of 100 (Routine)
Madison Wb City	United States	Record low minimum temperature	5.0 C (41.0 F)	13 of 100 (Routine)
Dubuque River	United States	Record low minimum temperature	2.2 C (36.0 F)	13 of 100 (Routine)
Winton Post Office	Australia	Record daily precipitation	5.3 mm (0.21 in)	12 of 100 (Routine)
Lindsay	Canada	Record low maximum temperature	15.0 C (59.0 F)	12 of 100 (Routine)
Vineland	United States	Record low minimum temperature	3.9 C (39.0 F)	12 of 100 (Routine)
Robe Comparison	Australia	Record high maximum temperature	20.7 C (69.3 F)	11 of 100 (Routine)
Beatrice	Canada	Record low maximum temperature	13.9 C (57.0 F)	11 of 100 (Routine)
Algiers-Ville/Universite	Algeria	Record high minimum temperature	24.0 C (75.2 F)	10 of 100 (Routine)
Darwin Post Office	Australia	Record high maximum temperature	36.3 C (97.3 F)	10 of 100 (Routine)
Hoofddorp	Netherlands	Record daily precipitation	18.8 mm (0.7 in)	10 of 100 (Routine)
Cape May 2 NW	United States	Record low maximum temperature	16.7 C (62.1 F)	10 of 100 (Routine)
Setauket Strong	United States	Record low minimum temperature	8.3 C (46.9 F)	10 of 100 (Routine)
Burlington	United States	Record low maximum temperature	12.2 C (54.0 F)	10 of 100 (Routine)

Counts by Type and Timescale

88 records

Records set or tied on 11 September 1917 by type: Highest daily maximum 3, Lowest daily maximum 27, Highest daily minimum 4, Lowest daily minimum 37, Heaviest daily rainfall 17.

Records on 11 September 1917 by type
Record type	Records
Highest daily maximum	3
Lowest daily maximum	27
Highest daily minimum	4
Lowest daily minimum	37
Heaviest daily rainfall	17
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 11 September 1917 by timescale: all-time 0, monthly 0, daily 88.

How Much Records Were Beaten By

77 broken records

Margins by which the 77 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 31.8. Ties are not counted.

Top 20 by Significance

11 September 1917

Top 20 records on 11 September 1917 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
11 September 1917	Beachport, AU	daily rain	27.9 mm (1.1 in)	17.0 mm (0.7 in)	23 years	50 of 100 (Notable)
11 September 1917	Tempe Downs, AU	daily rain	33.3 mm (1.3 in)	31.8 mm (1.3 in)	7 years	45 of 100 (Notable)
11 September 1917	Middletown 4 W, US	daily low min	-2.8 C (27.0 F)	6.4 C (11.5 F)	33 years	27 of 100 (Routine)
11 September 1917	Morgantown 1, US	daily low min	1.1 C (34.0 F)	5.6 C (10.1 F)	41 years	27 of 100 (Routine)
11 September 1917	Newark Liberty Intl AP, US	daily low min	7.2 C (45.0 F)	0.6 C (1.1 F)	62 years	26 of 100 (Routine)
11 September 1917	Washington, US	daily low min	4.4 C (39.9 F)	3.9 C (7.0 F)	41 years	26 of 100 (Routine)
11 September 1917	Brinkworth (Bungaree), AU	daily rain	36.8 mm (1.4 in)	14.4 mm (0.6 in)	2 years	24 of 100 (Routine)
11 September 1917	Baltimore Customs House, US	daily low min	6.1 C (43.0 F)	3.3 C (5.9 F)	41 years	24 of 100 (Routine)
11 September 1917	Middletown 4 W, US	daily low max	14.4 C (57.9 F)	3.9 C (7.0 F)	34 years	23 of 100 (Routine)
11 September 1917	World Trade Ctr, US	daily low min	6.1 C (43.0 F)	2.8 C (5.0 F)	41 years	23 of 100 (Routine)
11 September 1917	Jacksonville Wb City, US	daily low max	23.9 C (75.0 F)	1.7 C (3.1 F)	43 years	23 of 100 (Routine)
11 September 1917	Ny City Cntrl Park, US	daily low min	6.1 C (43.0 F)	3.3 C (5.9 F)	41 years	23 of 100 (Routine)
11 September 1917	Algiers-Ville/Universite, DZ	daily high max	39.0 C (102.2 F)	3.8 C (6.8 F)	23 years	22 of 100 (Routine)
11 September 1917	Port Dover, CA	daily low min	1.1 C (34.0 F)	3.3 C (5.9 F)	41 years	22 of 100 (Routine)
11 September 1917	Atlantic City Marina, US	daily low min	6.7 C (44.1 F)	2.7 C (4.9 F)	41 years	22 of 100 (Routine)
11 September 1917	Philadelphia City, US	daily low min	6.1 C (43.0 F)	2.2 C (4.0 F)	41 years	21 of 100 (Routine)
11 September 1917	Lexington Bluegrass AP, US	daily low min	5.6 C (42.1 F)	2.7 C (4.9 F)	41 years	21 of 100 (Routine)
11 September 1917	Cape Northumberland, AU	daily rain	24.1 mm (0.9 in)	15.0 mm (0.6 in)	15 years	20 of 100 (Routine)
11 September 1917	Murray Town (Doughboy Creek), AU	daily rain	21.6 mm (0.9 in)	12.7 mm (0.5 in)	31 years	20 of 100 (Routine)
11 September 1917	Swift Current, CA	daily rain	13.7 mm (0.5 in)	7.1 mm (0.28 in)	26 years	20 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

1809 to 1917

Records set or tied on this calendar date in each year from 1809 to 1917. 1917 had 88 records.

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

Records on 09-11 in each year
Year	Records
1809	1
1814	3
1818	1
1830	1
1836	1
1838	3
1839	1
1848	1
1850	1
1851	1
1854	2
1858	1
1860	2
1861	1
1863	2
1865	3
1866	1
1874	2
1876	1
1877	1
1879	1
1880	1
1882	4
1883	2
1884	1
1886	1
1888	2
1889	4
1890	2
1891	2
1892	1
1893	4
1894	2
1895	4
1896	1
1897	3
1898	3
1899	5
1900	1
1901	3
1902	15
1903	13
1904	4
1905	5
1906	10
1907	9
1908	20
1909	12
1910	19
1911	9
1912	25
1913	22
1914	52
1915	160
1916	17
1917	88
1918	62
1919	52
1920	158
1921	52
1922	78
1923	44
1924	290
1925	260
1926	137
1927	300
1928	127
1929	206
1930	136
1931	868
1932	210
1933	276
1934	144
1935	410
1936	567
1937	324
1938	288
1939	561
1940	891
1941	210
1942	234
1943	335
1944	446
1945	341
1946	262
1947	611
1948	424
1949	450
1950	462
1951	247
1952	549
1953	392
1954	363
1955	479
1956	539
1957	470
1958	748
1959	488
1960	423
1961	524
1962	480
1963	359
1964	1,195
1965	414
1966	392
1967	478
1968	835
1969	685
1970	474
1971	464
1972	507
1973	612
1974	430
1975	644
1976	920
1977	406
1978	911
1979	596
1980	474
1981	347
1982	862
1983	1,243
1984	888
1985	844
1986	1,221
1987	595
1988	1,019
1989	1,301
1990	840
1991	843
1992	672
1993	809
1994	713
1995	619
1996	1,030
1997	808
1998	1,821
1999	1,073
2000	1,469
2001	826
2002	1,059
2003	1,022
2004	740
2005	1,163
2006	1,132
2007	947
2008	916
2009	774
2010	965
2011	1,051
2012	687
2013	1,207
2014	1,100
2015	683
2016	677
2017	916
2018	763
2019	806
2020	1,235
2021	851
2022	617
2023	1,034
2024	889
2025	917
2026	615

Download the Data

Data for records on 1917-09-11: 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 5	66
5 to 10	4
10 to 15	4
15 to 20	2
20 to 25	0
25 to 30	0
30 to 35	1