Weather Records on 21 September 1918

43 weather records were set or tied worldwide on 21 September 1918. Highest significance: Saint John, CA.

Key Facts for 21 September 1918

On 21 September 1918, 43 weather records were set or tied at long-record stations worldwide.
7 were record highs and 19 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 2 monthly and 41 daily.
Saint John set a daily record precipitation of 39.4 mm (1.6 in) on 21 September 1918.
Across 155 earlier years (1805 to 2026) the same calendar date averaged 454 records.

Record Map

43 stations

43 station records on 21 September 1918 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 September 1918: highest significance records shown on the map
Station	Country	Type	Value	Significance
Saint John	Canada	Record daily precipitation	39.4 mm (1.6 in)	32 of 100 (Routine)
Vineland	United States	Record daily precipitation	54.1 mm (2.1 in)	32 of 100 (Routine)
Morgantown 1	United States	Record low maximum temperature	11.1 C (52.0 F)	28 of 100 (Routine)
Yarmouth	Canada	Record daily precipitation	60.2 mm (2.4 in)	21 of 100 (Routine)
Cherdyn'	Russia	Record daily precipitation	19.8 mm (0.8 in)	20 of 100 (Routine)
Surgut	Russia	Record daily precipitation	7.1 mm (0.28 in)	20 of 100 (Routine)
Sydney	Canada	Record high minimum temperature	17.2 C (63.0 F)	19 of 100 (Routine)
Perm	Russia	Record daily precipitation	19.7 mm (0.8 in)	19 of 100 (Routine)
Montgomery Wb City	United States	Record low minimum temperature	7.8 C (46.0 F)	18 of 100 (Routine)
Lake Cochituate	United States	Record daily precipitation	46.2 mm (1.8 in)	18 of 100 (Routine)
Baltimore Customs House	United States	Record low maximum temperature	16.1 C (61.0 F)	18 of 100 (Routine)
Washington	United States	Record low maximum temperature	15.6 C (60.1 F)	18 of 100 (Routine)
Watford	Canada	Record daily precipitation	13.7 mm (0.5 in)	16 of 100 (Routine)
St John's	Canada	Record high maximum temperature	25.6 C (78.1 F)	16 of 100 (Routine)
Cape May 2 NW	United States	Record daily precipitation	11.7 mm (0.5 in)	16 of 100 (Routine)
Chatham	Canada	Record daily precipitation	24.4 mm (1.0 in)	15 of 100 (Routine)
Bjuroklubb	Sweden	Record daily precipitation	15.0 mm (0.6 in)	15 of 100 (Routine)
Nicosia	Cyprus	Record daily precipitation	0.8 mm (0.03 in)	14 of 100 (Routine)
Chattanooga Wb City	United States	Record low minimum temperature	7.2 C (45.0 F)	14 of 100 (Routine)
Wilmington Wb City	United States	Record low minimum temperature	10.0 C (50.0 F)	13 of 100 (Routine)
La Crosse Wb City	United States	Record low minimum temperature	0.0 C (32.0 F)	13 of 100 (Routine)
Houston Wb City	United States	Record low maximum temperature	22.8 C (73.0 F)	13 of 100 (Routine)
Quebec	Canada	Record daily precipitation	16.3 mm (0.6 in)	12 of 100 (Routine)
State College	United States	Record low maximum temperature	12.2 C (54.0 F)	12 of 100 (Routine)
Houston Wb City	United States	Record low minimum temperature	11.7 C (53.1 F)	12 of 100 (Routine)
Jacksonville Wb City	United States	Record low maximum temperature	20.6 C (69.1 F)	11 of 100 (Routine)
Woolsthorpe	Australia	Record daily precipitation	13.5 mm (0.5 in)	10 of 100 (Routine)
Halifax	Canada	Record high minimum temperature	16.7 C (62.1 F)	9 of 100 (Routine)
Hanover	United States	Record daily precipitation	23.6 mm (0.9 in)	8 of 100 (Routine)
Hamilton	Canada	Record low maximum temperature	12.8 C (55.0 F)	6 of 100 (Routine)
Pointe Riche	Canada	Record daily precipitation	16.5 mm (0.6 in)	6 of 100 (Routine)
Stornoway Airport	United Kingdom	Record low minimum temperature	0.0 C (32.0 F)	6 of 100 (Routine)
Lincoln UNIV Pwr Plt	United States	Record low minimum temperature	3.3 C (37.9 F)	5 of 100 (Routine)
Lexington Bluegrass AP	United States	Record low minimum temperature	4.4 C (39.9 F)	4 of 100 (Routine)
Charlottetown	Canada	Record high minimum temperature	16.1 C (61.0 F)	3 of 100 (Routine)
St John's	Canada	Record high minimum temperature	12.8 C (55.0 F)	3 of 100 (Routine)
Tobolsk	Russia	Record daily precipitation	7.6 mm (0.30 in)	3 of 100 (Routine)
Alton	Canada	Record low maximum temperature	11.1 C (52.0 F)	2 of 100 (Routine)
Bird Rocks	Canada	Record high minimum temperature	14.4 C (57.9 F)	2 of 100 (Routine)
Hvar	Croatia	Record high minimum temperature	20.2 C (68.4 F)	2 of 100 (Routine)
Setauket Strong	United States	Record low maximum temperature	16.1 C (61.0 F)	2 of 100 (Routine)
Cleveland 2717 Euclid	United States	Record low maximum temperature	10.6 C (51.1 F)	2 of 100 (Routine)
Little Rock St Capitol	United States	Record low minimum temperature	8.9 C (48.0 F)	1 of 100 (Routine)

Counts by Type and Timescale

43 records

Records set or tied on 21 September 1918 by type: Highest daily maximum 1, Lowest daily maximum 10, Highest daily minimum 6, Lowest daily minimum 9, Heaviest daily rainfall 17.

Records on 21 September 1918 by type
Record type	Records
Highest daily maximum	1
Lowest daily maximum	10
Highest daily minimum	6
Lowest daily minimum	9
Heaviest daily rainfall	17
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 21 September 1918 by timescale: all-time 0, monthly 2, daily 41.

How Much Records Were Beaten By

33 broken records

Margins by which the 33 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 30.2. Ties are not counted.

Top 20 by Significance

21 September 1918

Top 20 records on 21 September 1918 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 September 1918	Saint John, CA	daily rain	39.4 mm (1.6 in)	16.0 mm (0.6 in)	43 years	32 of 100 (Routine)
21 September 1918	Vineland, US	daily rain	54.1 mm (2.1 in)	27.2 mm (1.1 in)	35 years	32 of 100 (Routine)
21 September 1918	Morgantown 1, US	monthly low max	11.1 C (52.0 F)	1.1 C (2.0 F)	43 years	28 of 100 (Routine)
21 September 1918	Yarmouth, CA	daily rain	60.2 mm (2.4 in)	15.0 mm (0.6 in)	15 years	21 of 100 (Routine)
21 September 1918	Cherdyn', RU	daily rain	19.8 mm (0.8 in)	11.7 mm (0.5 in)	4 years	20 of 100 (Routine)
21 September 1918	Surgut, RU	daily rain	7.1 mm (0.28 in)	3.3 mm (0.13 in)	32 years	20 of 100 (Routine)
21 September 1918	Sydney, CA	daily high min	17.2 C (63.0 F)	1.6 C (2.9 F)	39 years	19 of 100 (Routine)
21 September 1918	Perm, RU	daily rain	19.7 mm (0.8 in)	6.5 mm (0.26 in)	4 years	19 of 100 (Routine)
21 September 1918	Montgomery Wb City, US	daily low min	7.8 C (46.0 F)	3.3 C (5.9 F)	15 years	18 of 100 (Routine)
21 September 1918	Lake Cochituate, US	daily rain	46.2 mm (1.8 in)	30.2 mm (1.2 in)	3 years	18 of 100 (Routine)
21 September 1918	Baltimore Customs House, US	daily low max	16.1 C (61.0 F)	0.6 C (1.1 F)	44 years	18 of 100 (Routine)
21 September 1918	Washington, US	daily low max	15.6 C (60.1 F)	0.5 C (0.9 F)	38 years	18 of 100 (Routine)
21 September 1918	Watford, CA	daily rain	13.7 mm (0.5 in)	3.8 mm (0.15 in)	34 years	16 of 100 (Routine)
21 September 1918	St John's, CA	daily high max	25.6 C (78.1 F)	0.6 C (1.1 F)	39 years	16 of 100 (Routine)
21 September 1918	Cape May 2 NW, US	daily rain	11.7 mm (0.5 in)	2.6 mm (0.10 in)	38 years	16 of 100 (Routine)
21 September 1918	Chatham, CA	daily rain	24.4 mm (1.0 in)	6.4 mm (0.25 in)	16 years	15 of 100 (Routine)
21 September 1918	Bjuroklubb, SE	daily rain	15.0 mm (0.6 in)	2.0 mm (0.08 in)	28 years	15 of 100 (Routine)
21 September 1918	Nicosia, CY	daily rain	0.8 mm (0.03 in)	0.8 mm (0.03 in)	36 years	14 of 100 (Routine)
21 September 1918	Chattanooga Wb City, US	daily low min	7.2 C (45.0 F)	2.2 C (4.0 F)	15 years	14 of 100 (Routine)
21 September 1918	Wilmington Wb City, US	daily low min	10.0 C (50.0 F)	1.1 C (2.0 F)	20 years	13 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

1805 to 1918

Records set or tied on this calendar date in each year from 1805 to 1918. 1918 had 43 records.

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

Records on 09-21 in each year
Year	Records
1805	1
1812	1
1825	2
1840	1
1841	1
1842	1
1848	1
1854	1
1856	2
1868	1
1872	2
1873	1
1877	1
1878	1
1881	1
1882	1
1884	1
1886	1
1888	2
1889	1
1891	10
1892	1
1893	10
1894	2
1895	3
1896	2
1897	6
1898	6
1899	3
1900	2
1901	5
1902	5
1903	8
1904	20
1905	12
1906	17
1907	10
1908	17
1909	10
1910	8
1911	18
1912	26
1913	37
1914	29
1915	34
1916	48
1917	28
1918	43
1919	54
1920	29
1921	64
1922	35
1923	232
1924	291
1925	278
1926	178
1927	165
1928	81
1929	232
1930	82
1931	681
1932	242
1933	193
1934	492
1935	199
1936	329
1937	487
1938	508
1939	308
1940	908
1941	416
1942	291
1943	407
1944	413
1945	507
1946	176
1947	534
1948	301
1949	298
1950	334
1951	241
1952	430
1953	382
1954	453
1955	752
1956	1,100
1957	366
1958	588
1959	513
1960	418
1961	441
1962	1,085
1963	306
1964	374
1965	1,088
1966	565
1967	577
1968	790
1969	593
1970	708
1971	645
1972	599
1973	421
1974	652
1975	528
1976	694
1977	918
1978	818
1979	736
1980	990
1981	696
1982	1,484
1983	2,207
1984	707
1985	796
1986	671
1987	965
1988	557
1989	1,002
1990	716
1991	1,021
1992	752
1993	911
1994	713
1995	2,002
1996	1,233
1997	1,112
1998	1,481
1999	1,025
2000	884
2001	718
2002	696
2003	959
2004	888
2005	1,143
2006	920
2007	742
2008	740
2009	715
2010	1,290
2011	542
2012	595
2013	769
2014	716
2015	565
2016	989
2017	1,178
2018	1,051
2019	833
2020	580
2021	465
2022	1,049
2023	783
2024	470
2025	591
2026	478

Download the Data

Data for records on 1918-09-21: 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 2026-10-14 (14 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	25
5 to 10	3
10 to 15	1
15 to 20	2
20 to 25	0
25 to 30	1
30 to 35	1