Weather Records on 18 September 1918

57 weather records were set or tied worldwide on 18 September 1918. Highest significance: Setauket Strong, US.

Key Facts for 18 September 1918

On 18 September 1918, 57 weather records were set or tied at long-record stations worldwide.
20 were record highs and 10 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 1 monthly and 56 daily.
Setauket Strong set a daily record precipitation of 72.9 mm (2.9 in) on 18 September 1918.
Across 163 earlier years (1803 to 2026) the same calendar date averaged 424 records.

Record Map

57 stations

57 station records on 18 September 1918 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 September 1918: highest significance records shown on the map
Station	Country	Type	Value	Significance
Setauket Strong	United States	Record daily precipitation	72.9 mm (2.9 in)	45 of 100 (Notable)
Olands Sodra Udde	Sweden	Record daily precipitation	33.3 mm (1.3 in)	41 of 100 (Notable)
Washington	United States	Record daily precipitation	25.7 mm (1.0 in)	27 of 100 (Routine)
White River	Canada	Record daily precipitation	26.2 mm (1.0 in)	26 of 100 (Routine)
Praha-Klementinum	Czech Republic	Record high maximum temperature	27.7 C (81.9 F)	25 of 100 (Routine)
Newark Liberty Intl AP	United States	Record daily precipitation	38.1 mm (1.5 in)	24 of 100 (Routine)
Moorestown 4 E	United States	Record daily precipitation	65.8 mm (2.6 in)	23 of 100 (Routine)
Lund	Sweden	Record daily precipitation	18.6 mm (0.7 in)	20 of 100 (Routine)
Hano_A	Sweden	Record daily precipitation	13.5 mm (0.5 in)	20 of 100 (Routine)
Gysinge	Sweden	Record daily precipitation	10.6 mm (0.4 in)	20 of 100 (Routine)
Kristianstad	Sweden	Record daily precipitation	14.3 mm (0.6 in)	19 of 100 (Routine)
Concord	United States	Record low maximum temperature	13.3 C (55.9 F)	19 of 100 (Routine)
Somerville 4 NW	United States	Record daily precipitation	36.3 mm (1.4 in)	19 of 100 (Routine)
Salzburg	Austria	Record high maximum temperature	28.5 C (83.3 F)	18 of 100 (Routine)
Portland Rfc City	United States	Record high minimum temperature	15.6 C (60.1 F)	18 of 100 (Routine)
Winnipeg St Johns Coll	Canada	Record low maximum temperature	8.9 C (48.0 F)	17 of 100 (Routine)
Hoburg	Sweden	Record daily precipitation	13.0 mm (0.5 in)	17 of 100 (Routine)
World Trade Ctr	United States	Record low maximum temperature	17.2 C (63.0 F)	17 of 100 (Routine)
Falsterbo	Sweden	Record daily precipitation	19.0 mm (0.7 in)	16 of 100 (Routine)
Jonkoping	Sweden	Record high minimum temperature	12.6 C (54.7 F)	16 of 100 (Routine)
Kerkwerve	Netherlands	Record daily precipitation	20.0 mm (0.8 in)	15 of 100 (Routine)
Kvikkjokk-Arrenjarka	Sweden	Record low minimum temperature	-7.5 C (18.5 F)	15 of 100 (Routine)
Philadelphia City	United States	Record daily precipitation	48.5 mm (1.9 in)	15 of 100 (Routine)
Nicosia	Cyprus	Record daily precipitation	0.3 mm (0.01 in)	14 of 100 (Routine)
Hohenpeissenberg	Germany	Record high minimum temperature	16.4 C (61.5 F)	14 of 100 (Routine)
Freiburg	Germany	Record high minimum temperature	16.0 C (60.8 F)	14 of 100 (Routine)
Boras	Sweden	Record high minimum temperature	13.0 C (55.4 F)	14 of 100 (Routine)
Escanaba	United States	Record low maximum temperature	9.4 C (48.9 F)	14 of 100 (Routine)
Rapid City Forrest	Canada	Record daily snowfall	0.5 cm (0.2 in)	13 of 100 (Routine)
Tbilisi	Georgia	Record high minimum temperature	18.3 C (64.9 F)	13 of 100 (Routine)
Plauen	Germany	Record high maximum temperature	26.2 C (79.2 F)	13 of 100 (Routine)
Tomsk	Russia	Record daily precipitation	10.3 mm (0.4 in)	13 of 100 (Routine)
Morris W Cntrl Rsch & Outreach	United States	Record low minimum temperature	-2.2 C (28.0 F)	13 of 100 (Routine)
Calgary Int'l A	Canada	Record high minimum temperature	12.2 C (54.0 F)	12 of 100 (Routine)
Cap Chat	Canada	Record daily precipitation	17.8 mm (0.7 in)	12 of 100 (Routine)
Sandvig	Denmark	Record high maximum temperature	20.5 C (68.9 F)	12 of 100 (Routine)
Port Jervis	United States	Record daily precipitation	20.3 mm (0.8 in)	12 of 100 (Routine)
Weldon	United States	Record daily precipitation	31.2 mm (1.2 in)	12 of 100 (Routine)
Wrixum/Fohr	Germany	Record high minimum temperature	14.1 C (57.4 F)	11 of 100 (Routine)
Rapid City Forrest	Canada	Record daily precipitation	1.0 mm (0.04 in)	10 of 100 (Routine)
Kalmar_D	Sweden	Record daily precipitation	15.0 mm (0.6 in)	10 of 100 (Routine)
Burlington	United States	Record low maximum temperature	13.9 C (57.0 F)	10 of 100 (Routine)
Sonnblick	Austria	Record high maximum temperature	7.4 C (45.3 F)	9 of 100 (Routine)
Altastenberg	Germany	Record high minimum temperature	12.5 C (54.5 F)	8 of 100 (Routine)
Arnsberg	Germany	Record high minimum temperature	14.0 C (57.2 F)	8 of 100 (Routine)
Munchen-Nymphenburg	Germany	Record high maximum temperature	27.3 C (81.1 F)	7 of 100 (Routine)
Hohenpeissenberg	Germany	Record high maximum temperature	24.9 C (76.8 F)	7 of 100 (Routine)
Baltimore Customs House	United States	Record daily precipitation	25.7 mm (1.0 in)	7 of 100 (Routine)
Munchen-Nymphenburg	Germany	Record high minimum temperature	14.7 C (58.5 F)	6 of 100 (Routine)
Durham	United Kingdom	Record daily precipitation	6.0 mm (0.24 in)	6 of 100 (Routine)
Sonnblick	Austria	Record high minimum temperature	3.0 C (37.4 F)	5 of 100 (Routine)
Douglas	South Africa	Record daily precipitation	8.4 mm (0.33 in)	4 of 100 (Routine)
Magdeburg	Germany	Record high minimum temperature	14.3 C (57.7 F)	3 of 100 (Routine)
Woodstock	Canada	Record low maximum temperature	11.7 C (53.1 F)	2 of 100 (Routine)
Harnosand	Sweden	Record low minimum temperature	1.5 C (34.7 F)	1 of 100 (Routine)
Bryson City 2	United States	Record daily precipitation	11.4 mm (0.4 in)	1 of 100 (Routine)
Huron Rgnl AP	United States	Record low minimum temperature	-2.8 C (27.0 F)	1 of 100 (Routine)

Counts by Type and Timescale

57 records

Records set or tied on 18 September 1918 by type: Highest daily maximum 7, Lowest daily maximum 6, Highest daily minimum 13, Lowest daily minimum 4, Heaviest daily rainfall 26, Heaviest daily snowfall 1.

Records on 18 September 1918 by type
Record type	Records
Highest daily maximum	7
Lowest daily maximum	6
Highest daily minimum	13
Lowest daily minimum	4
Heaviest daily rainfall	26
Heaviest daily snowfall	1
Deepest snow cover	0

Records on 18 September 1918 by timescale: all-time 0, monthly 1, daily 56.

How Much Records Were Beaten By

52 broken records

Margins by which the 52 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 46.2. Ties are not counted.

Top 20 by Significance

18 September 1918

Top 20 records on 18 September 1918 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 September 1918	Setauket Strong, US	daily rain	72.9 mm (2.9 in)	46.2 mm (1.8 in)	29 years	45 of 100 (Notable)
18 September 1918	Olands Sodra Udde, SE	monthly rain	33.3 mm (1.3 in)	9.8 mm (0.39 in)	15 years	41 of 100 (Notable)
18 September 1918	Washington, US	daily rain	25.7 mm (1.0 in)	14.3 mm (0.6 in)	42 years	27 of 100 (Routine)
18 September 1918	White River, CA	daily rain	26.2 mm (1.0 in)	15.0 mm (0.6 in)	3 years	26 of 100 (Routine)
18 September 1918	Praha-Klementinum, CZ	daily high max	27.7 C (81.9 F)	0.7 C (1.3 F)	48 years	25 of 100 (Routine)
18 September 1918	Newark Liberty Intl AP, US	daily rain	38.1 mm (1.5 in)	1.3 mm (0.05 in)	56 years	24 of 100 (Routine)
18 September 1918	Moorestown 4 E, US	daily rain	65.8 mm (2.6 in)	18.8 mm (0.7 in)	23 years	23 of 100 (Routine)
18 September 1918	Lund, SE	daily rain	18.6 mm (0.7 in)	2.9 mm (0.11 in)	39 years	20 of 100 (Routine)
18 September 1918	Hano_A, SE	daily rain	13.5 mm (0.5 in)	4.9 mm (0.19 in)	24 years	20 of 100 (Routine)
18 September 1918	Gysinge, SE	daily rain	10.6 mm (0.4 in)	3.0 mm (0.12 in)	37 years	20 of 100 (Routine)
18 September 1918	Kristianstad, SE	daily rain	14.3 mm (0.6 in)	1.9 mm (0.07 in)	39 years	19 of 100 (Routine)
18 September 1918	Concord, US	daily low max	13.3 C (55.9 F)	1.1 C (2.0 F)	42 years	19 of 100 (Routine)
18 September 1918	Somerville 4 NW, US	daily rain	36.3 mm (1.4 in)	13.9 mm (0.5 in)	23 years	19 of 100 (Routine)
18 September 1918	Salzburg, AT	daily high max	28.5 C (83.3 F)	2.5 C (4.5 F)	32 years	18 of 100 (Routine)
18 September 1918	Portland Rfc City, US	daily high min	15.6 C (60.1 F)	0.6 C (1.1 F)	42 years	18 of 100 (Routine)
18 September 1918	Winnipeg St Johns Coll, CA	daily low max	8.9 C (48.0 F)	0.5 C (0.9 F)	44 years	17 of 100 (Routine)
18 September 1918	Hoburg, SE	daily rain	13.0 mm (0.5 in)	3.0 mm (0.12 in)	34 years	17 of 100 (Routine)
18 September 1918	World Trade Ctr, US	daily low max	17.2 C (63.0 F)	0.6 C (1.1 F)	42 years	17 of 100 (Routine)
18 September 1918	Falsterbo, SE	daily rain	19.0 mm (0.7 in)	6.3 mm (0.25 in)	1 year	16 of 100 (Routine)
18 September 1918	Jonkoping, SE	daily high min	12.6 C (54.7 F)	1.1 C (2.0 F)	35 years	16 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

1803 to 1918

Records set or tied on this calendar date in each year from 1803 to 1918. 1918 had 57 records.

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

Records on 09-18 in each year
Year	Records
1803	1
1811	1
1814	1
1819	1
1829	1
1832	1
1834	1
1835	1
1837	2
1847	2
1848	1
1849	1
1851	4
1859	1
1861	1
1865	1
1869	1
1871	1
1875	1
1876	2
1877	1
1879	1
1880	1
1881	1
1882	1
1885	1
1886	4
1889	6
1890	1
1891	1
1893	4
1894	2
1895	2
1896	4
1897	3
1898	5
1899	3
1900	2
1901	10
1902	8
1903	58
1904	6
1905	22
1906	16
1907	4
1908	11
1909	17
1910	5
1911	8
1912	43
1913	44
1914	56
1915	41
1916	58
1917	99
1918	57
1919	48
1920	56
1921	213
1922	45
1923	114
1924	62
1925	269
1926	205
1927	189
1928	114
1929	309
1930	124
1931	429
1932	226
1933	370
1934	188
1935	281
1936	155
1937	422
1938	373
1939	190
1940	402
1941	318
1942	1,001
1943	624
1944	503
1945	732
1946	576
1947	927
1948	427
1949	356
1950	370
1951	320
1952	340
1953	245
1954	446
1955	672
1956	587
1957	429
1958	491
1959	829
1960	351
1961	478
1962	360
1963	453
1964	282
1965	1,172
1966	498
1967	357
1968	763
1969	424
1970	377
1971	1,245
1972	691
1973	593
1974	559
1975	976
1976	615
1977	619
1978	1,162
1979	709
1980	652
1981	1,671
1982	603
1983	936
1984	951
1985	636
1986	730
1987	1,244
1988	997
1989	778
1990	904
1991	1,377
1992	821
1993	747
1994	852
1995	935
1996	1,237
1997	935
1998	1,038
1999	583
2000	1,146
2001	993
2002	828
2003	815
2004	1,027
2005	781
2006	1,309
2007	670
2008	697
2009	692
2010	1,040
2011	1,050
2012	922
2013	666
2014	682
2015	934
2016	893
2017	518
2018	1,200
2019	768
2020	682
2021	582
2022	613
2023	639
2024	687
2025	471
2026	864

Download the Data

Data for records on 1918-09-18: 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).

Histogram of margins by which records were beaten on 18 September 1918
Margin	Records
0 to 10	46
10 to 20	5
20 to 30	0
30 to 40	0
40 to 50	1