Weather Records on 18 April 1921

58 weather records were set or tied worldwide on 18 April 1921. Highest significance: Hamilton, CA.

Key Facts for 18 April 1921

On 18 April 1921, 58 weather records were set or tied at long-record stations worldwide.
3 were record highs and 29 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 3 monthly and 55 daily.
Hamilton set a daily record precipitation of 30.7 mm (1.2 in) on 18 April 1921.
Across 160 earlier years (1793 to 2026) the same calendar date averaged 470 records.

Record Map

58 stations

58 station records on 18 April 1921 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 April 1921: highest significance records shown on the map
Station	Country	Type	Value	Significance
Hamilton	Canada	Record daily precipitation	30.7 mm (1.2 in)	36 of 100 (Notable)
Godegard	Sweden	Record daily precipitation	31.3 mm (1.2 in)	33 of 100 (Routine)
Vasteras-Hasslo	Sweden	Record daily precipitation	25.8 mm (1.0 in)	30 of 100 (Routine)
Olands Norra Udde	Sweden	Record daily precipitation	26.5 mm (1.0 in)	26 of 100 (Routine)
Montgomery Wb City	United States	Record low maximum temperature	15.6 C (60.1 F)	23 of 100 (Routine)
Landsort	Sweden	Record daily precipitation	21.0 mm (0.8 in)	20 of 100 (Routine)
Bjuroklubb	Sweden	Record daily precipitation	15.3 mm (0.6 in)	20 of 100 (Routine)
Hoburg	Sweden	Record daily precipitation	19.0 mm (0.7 in)	20 of 100 (Routine)
Gysinge	Sweden	Record daily precipitation	23.5 mm (0.9 in)	20 of 100 (Routine)
Harnosand	Sweden	Record daily precipitation	18.5 mm (0.7 in)	20 of 100 (Routine)
Bjuraker	Sweden	Record daily precipitation	12.6 mm (0.5 in)	20 of 100 (Routine)
Dohne (Sar)	South Africa	Record daily precipitation	17.0 mm (0.7 in)	20 of 100 (Routine)
Ulan-Ude	Russia	Record daily precipitation	4.9 mm (0.19 in)	20 of 100 (Routine)
Chattanooga Wb City	United States	Record low maximum temperature	12.8 C (55.0 F)	20 of 100 (Routine)
Jacksonville Wb City	United States	Record low minimum temperature	6.1 C (43.0 F)	20 of 100 (Routine)
London South	Canada	Record daily snowfall	11.4 cm (4.5 in)	19 of 100 (Routine)
Vastervik	Sweden	Record daily precipitation	24.5 mm (1.0 in)	19 of 100 (Routine)
Montgomery Wb City	United States	Record low minimum temperature	4.4 C (39.9 F)	19 of 100 (Routine)
Linkoeping-Malmslaett	Sweden	Record daily precipitation	18.5 mm (0.7 in)	18 of 100 (Routine)
Blue Hill Coop	United States	Record daily precipitation	19.3 mm (0.8 in)	18 of 100 (Routine)
Uman	Ukraine	Record daily precipitation	22.5 mm (0.9 in)	17 of 100 (Routine)
Renfrew	Canada	Record low minimum temperature	-8.9 C (16.0 F)	16 of 100 (Routine)
Woodstock	Canada	Record daily snowfall	5.1 cm (2.0 in)	16 of 100 (Routine)
Turkestan	Kazakhstan	Record daily precipitation	6.9 mm (0.27 in)	16 of 100 (Routine)
St. Petersburg	Russia	Record high maximum temperature	19.7 C (67.5 F)	16 of 100 (Routine)
Lowell	United States	Record low maximum temperature	5.6 C (42.1 F)	16 of 100 (Routine)
Gardiner	United States	Record low maximum temperature	3.3 C (37.9 F)	15 of 100 (Routine)
Innsbruck	Austria	Record low minimum temperature	-2.1 C (28.2 F)	14 of 100 (Routine)
Beatrice	Canada	Record low minimum temperature	-9.4 C (15.1 F)	14 of 100 (Routine)
Stratford	Canada	Record daily snowfall	2.5 cm (1.0 in)	13 of 100 (Routine)
Haliburton A	Canada	Record low minimum temperature	-10.0 C (14.0 F)	13 of 100 (Routine)
Lake Cochituate	United States	Record low maximum temperature	4.4 C (39.9 F)	13 of 100 (Routine)
Batesville	United States	Record low minimum temperature	-0.6 C (30.9 F)	13 of 100 (Routine)
Louisville	United States	Record low minimum temperature	1.1 C (34.0 F)	13 of 100 (Routine)
Newport	United States	Record low minimum temperature	0.6 C (33.1 F)	12 of 100 (Routine)
Plymouth	United States	Record low maximum temperature	2.8 C (37.0 F)	12 of 100 (Routine)
Salzburg	Austria	Record low minimum temperature	-3.0 C (26.6 F)	11 of 100 (Routine)
Alton	Canada	Record low maximum temperature	-1.1 C (30.0 F)	11 of 100 (Routine)
Blue Hill Coop	United States	Record daily snowfall	0.3 cm (0.1 in)	11 of 100 (Routine)
Penshurst (Post Office)	Australia	Record daily precipitation	11.9 mm (0.5 in)	10 of 100 (Routine)
Orskar_A	Sweden	Record daily precipitation	13.8 mm (0.5 in)	10 of 100 (Routine)
Louisville	United States	Record low maximum temperature	16.1 C (61.0 F)	10 of 100 (Routine)
Harrisburg - Coop	United States	Record low maximum temperature	6.1 C (43.0 F)	10 of 100 (Routine)
Houston Wb City	United States	Record low maximum temperature	21.1 C (70.0 F)	10 of 100 (Routine)
Port Arthur	Canada	Record high maximum temperature	18.9 C (66.0 F)	9 of 100 (Routine)
Junsele	Sweden	Record daily precipitation	7.2 mm (0.28 in)	9 of 100 (Routine)
Chattanooga Wb City	United States	Record low minimum temperature	2.2 C (36.0 F)	9 of 100 (Routine)
Brinkley	United States	Record low minimum temperature	-1.1 C (30.0 F)	8 of 100 (Routine)
Prescott 2 NNW	United States	Record low minimum temperature	0.0 C (32.0 F)	8 of 100 (Routine)
Bogoroditskoye-Fenino	Russia	Record high minimum temperature	7.8 C (46.0 F)	7 of 100 (Routine)
Gotska Sandon	Sweden	Record daily precipitation	14.2 mm (0.6 in)	7 of 100 (Routine)
Stuttgart	United States	Record low minimum temperature	1.1 C (34.0 F)	7 of 100 (Routine)
Camden 1	United States	Record low minimum temperature	1.1 C (34.0 F)	6 of 100 (Routine)
Lucknow	Canada	Record low minimum temperature	-7.2 C (19.0 F)	5 of 100 (Routine)
Sveg	Sweden	Record daily precipitation	6.8 mm (0.27 in)	3 of 100 (Routine)
Malvern	United States	Record low minimum temperature	3.3 C (37.9 F)	2 of 100 (Routine)
Mena	United States	Record low minimum temperature	0.6 C (33.1 F)	2 of 100 (Routine)
Columbia Wb City	United States	Record low minimum temperature	-1.1 C (30.0 F)	1 of 100 (Routine)

Counts by Type and Timescale

58 records

Records set or tied on 18 April 1921 by type: Highest daily maximum 2, Lowest daily maximum 10, Highest daily minimum 1, Lowest daily minimum 19, Heaviest daily rainfall 22, Heaviest daily snowfall 4.

Records on 18 April 1921 by type
Record type	Records
Highest daily maximum	2
Lowest daily maximum	10
Highest daily minimum	1
Lowest daily minimum	19
Heaviest daily rainfall	22
Heaviest daily snowfall	4
Deepest snow cover	0

Records on 18 April 1921 by timescale: all-time 0, monthly 3, daily 55.

How Much Records Were Beaten By

54 broken records

Margins by which the 54 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 106.0. Ties are not counted.

Top 20 by Significance

18 April 1921

Top 20 records on 18 April 1921 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 April 1921	Hamilton, CA	daily rain	30.7 mm (1.2 in)	15.2 mm (0.6 in)	50 years	36 of 100 (Notable)
18 April 1921	Godegard, SE	monthly rain	31.3 mm (1.2 in)	4.8 mm (0.19 in)	29 years	33 of 100 (Routine)
18 April 1921	Vasteras-Hasslo, SE	daily rain	25.8 mm (1.0 in)	8.4 mm (0.33 in)	3 years	30 of 100 (Routine)
18 April 1921	Olands Norra Udde, SE	monthly rain	26.5 mm (1.0 in)	3.9 mm (0.15 in)	0 years	26 of 100 (Routine)
18 April 1921	Montgomery Wb City, US	daily low max	15.6 C (60.1 F)	2.2 C (4.0 F)	47 years	23 of 100 (Routine)
18 April 1921	Landsort, SE	daily rain	21.0 mm (0.8 in)	16.5 mm (0.6 in)	11 years	20 of 100 (Routine)
18 April 1921	Bjuroklubb, SE	daily rain	15.3 mm (0.6 in)	10.7 mm (0.4 in)	26 years	20 of 100 (Routine)
18 April 1921	Hoburg, SE	daily rain	19.0 mm (0.7 in)	10.4 mm (0.4 in)	12 years	20 of 100 (Routine)
18 April 1921	Gysinge, SE	monthly rain	23.5 mm (0.9 in)	6.5 mm (0.26 in)	13 years	20 of 100 (Routine)
18 April 1921	Harnosand, SE	daily rain	18.5 mm (0.7 in)	13.5 mm (0.5 in)	8 years	20 of 100 (Routine)
18 April 1921	Bjuraker, SE	daily rain	12.6 mm (0.5 in)	6.3 mm (0.25 in)	32 years	20 of 100 (Routine)
18 April 1921	Dohne (Sar), ZA	daily rain	17.0 mm (0.7 in)	12.4 mm (0.5 in)	37 years	20 of 100 (Routine)
18 April 1921	Ulan-Ude, RU	daily rain	4.9 mm (0.19 in)	2.4 mm (0.09 in)	28 years	20 of 100 (Routine)
18 April 1921	Chattanooga Wb City, US	daily low max	12.8 C (55.0 F)	2.2 C (4.0 F)	41 years	20 of 100 (Routine)
18 April 1921	Jacksonville Wb City, US	daily low min	6.1 C (43.0 F)	1.1 C (2.0 F)	45 years	20 of 100 (Routine)
18 April 1921	London South, CA	daily snowfall	11.4 cm (4.5 in)	10.6 cm (4.2 in)	16 years	19 of 100 (Routine)
18 April 1921	Vastervik, SE	daily rain	24.5 mm (1.0 in)	3.3 mm (0.13 in)	22 years	19 of 100 (Routine)
18 April 1921	Montgomery Wb City, US	daily low min	4.4 C (39.9 F)	0.6 C (1.1 F)	45 years	19 of 100 (Routine)
18 April 1921	Linkoeping-Malmslaett, SE	daily rain	18.5 mm (0.7 in)	5.2 mm (0.20 in)	3 years	18 of 100 (Routine)
18 April 1921	Blue Hill Coop, US	daily rain	19.3 mm (0.8 in)	5.3 mm (0.21 in)	33 years	18 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

1793 to 1921

Records set or tied on this calendar date in each year from 1793 to 1921. 1921 had 58 records.

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

Records on 04-18 in each year
Year	Records
1793	1
1807	2
1815	1
1838	1
1847	1
1849	1
1851	1
1852	3
1854	3
1855	1
1865	4
1867	1
1870	1
1871	1
1875	4
1877	2
1878	1
1879	3
1880	2
1884	2
1886	2
1887	3
1888	1
1889	1
1890	2
1891	1
1892	3
1893	5
1894	7
1895	2
1896	3
1897	5
1898	8
1899	2
1900	2
1901	6
1902	5
1903	11
1904	9
1905	12
1906	18
1907	17
1908	37
1909	19
1910	19
1911	25
1912	21
1913	26
1914	38
1915	31
1916	22
1917	40
1918	76
1919	16
1920	64
1921	58
1922	85
1923	107
1924	101
1925	154
1926	322
1927	391
1928	323
1929	126
1930	113
1931	173
1932	326
1933	211
1934	391
1935	264
1936	483
1937	477
1938	711
1939	525
1940	322
1941	496
1942	287
1943	298
1944	259
1945	371
1946	357
1947	444
1948	932
1949	345
1950	244
1951	658
1952	536
1953	1,322
1954	442
1955	817
1956	467
1957	629
1958	370
1959	468
1960	320
1961	520
1962	484
1963	662
1964	449
1965	363
1966	776
1967	882
1968	867
1969	795
1970	771
1971	1,106
1972	470
1973	953
1974	326
1975	751
1976	1,309
1977	717
1978	803
1979	841
1980	842
1981	708
1982	616
1983	2,082
1984	625
1985	1,119
1986	622
1987	1,068
1988	936
1989	625
1990	1,368
1991	780
1992	702
1993	730
1994	1,218
1995	1,601
1996	826
1997	1,256
1998	1,011
1999	1,428
2000	912
2001	1,487
2002	2,084
2003	969
2004	846
2005	622
2006	1,262
2007	675
2008	913
2009	624
2010	478
2011	1,122
2012	744
2013	2,509
2014	534
2015	519
2016	973
2017	588
2018	1,202
2019	601
2020	770
2021	592
2022	1,013
2023	739
2024	641
2025	997
2026	498

Download the Data

Data for records on 1921-04-18: 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).

Margin	Records
0 to 20	52
20 to 40	0
40 to 60	1
60 to 80	0
80 to 100	0
100 to 120	1