Weather Records on 21 May 1918

51 weather records were set or tied worldwide on 21 May 1918. Highest significance: Oxford, GB.

Key Facts for 21 May 1918

On 21 May 1918, 51 weather records were set or tied at long-record stations worldwide.
25 were record highs and 4 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 0 monthly and 51 daily.
Oxford set a daily record high maximum temperature of 27.6 C (81.7 F) on 21 May 1918.
Across 156 earlier years (1793 to 2026) the same calendar date averaged 463 records.

Record Map

51 stations

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

Weather records on 21 May 1918: highest significance records shown on the map
Station	Country	Type	Value	Significance
Oxford	United Kingdom	Record high maximum temperature	27.6 C (81.7 F)	42 of 100 (Notable)
Dubuque River	United States	Record daily precipitation	40.9 mm (1.6 in)	22 of 100 (Routine)
Dublin Phoenix Park	Ireland	Record high maximum temperature	24.4 C (75.9 F)	21 of 100 (Routine)
World Trade Ctr	United States	Record daily precipitation	33.0 mm (1.3 in)	21 of 100 (Routine)
Springbok	South Africa	Record daily precipitation	11.7 mm (0.5 in)	20 of 100 (Routine)
Haparanda	Sweden	Record daily precipitation	5.6 mm (0.22 in)	20 of 100 (Routine)
Portland	United States	Record high minimum temperature	15.6 C (60.1 F)	20 of 100 (Routine)
Tobolsk	Russia	Record daily precipitation	6.7 mm (0.26 in)	18 of 100 (Routine)
Armagh	United Kingdom	Record high maximum temperature	23.1 C (73.6 F)	18 of 100 (Routine)
Edmonton	Canada	Record low minimum temperature	-3.9 C (25.0 F)	17 of 100 (Routine)
Hillview	Canada	Record daily precipitation	26.2 mm (1.0 in)	17 of 100 (Routine)
Nicosia	Cyprus	Record daily precipitation	7.6 mm (0.30 in)	17 of 100 (Routine)
Worcester	South Africa	Record daily precipitation	8.4 mm (0.33 in)	17 of 100 (Routine)
Cet Central England	United Kingdom	Record high maximum temperature	26.7 C (80.1 F)	17 of 100 (Routine)
Durham	United Kingdom	Record high minimum temperature	13.3 C (55.9 F)	16 of 100 (Routine)
Prince Albert	Canada	Record low maximum temperature	9.4 C (48.9 F)	15 of 100 (Routine)
Minnedosa	Canada	Record daily snowfall	0.3 cm (0.1 in)	15 of 100 (Routine)
Nuwara Eliya	Sri Lanka	Record low maximum temperature	15.6 C (60.1 F)	15 of 100 (Routine)
Qu'appelle	Canada	Record daily snowfall	11.4 cm (4.5 in)	14 of 100 (Routine)
Orebro	Sweden	Record high minimum temperature	11.0 C (51.8 F)	14 of 100 (Routine)
Tarnaby	Sweden	Record daily precipitation	3.2 mm (0.13 in)	14 of 100 (Routine)
Durham	United Kingdom	Record high maximum temperature	25.0 C (77.0 F)	14 of 100 (Routine)
Uccle	Belgium	Record high maximum temperature	29.5 C (85.1 F)	13 of 100 (Routine)
Prince Albert	Canada	Record daily snowfall	0.5 cm (0.2 in)	13 of 100 (Routine)
Altastenberg	Germany	Record high maximum temperature	26.5 C (79.7 F)	13 of 100 (Routine)
Setauket Strong	United States	Record high minimum temperature	16.1 C (61.0 F)	13 of 100 (Routine)
Wrixum/Fohr	Germany	Record high minimum temperature	12.4 C (54.3 F)	12 of 100 (Routine)
Bjuraker	Sweden	Record high minimum temperature	7.5 C (45.5 F)	12 of 100 (Routine)
Sveg	Sweden	Record high minimum temperature	7.5 C (45.5 F)	12 of 100 (Routine)
Umea	Sweden	Record high minimum temperature	6.5 C (43.7 F)	12 of 100 (Routine)
Wrixum/Fohr	Germany	Record high maximum temperature	22.6 C (72.7 F)	11 of 100 (Routine)
Bombala (Therry Street)	Australia	Record daily precipitation	4.3 mm (0.17 in)	10 of 100 (Routine)
Qu'appelle	Canada	Record low maximum temperature	2.2 C (36.0 F)	10 of 100 (Routine)
Kirchdorf/Poel	Germany	Record high maximum temperature	24.0 C (75.2 F)	9 of 100 (Routine)
Sheffield	United Kingdom	Record high maximum temperature	26.7 C (80.1 F)	9 of 100 (Routine)
Goolwa Council Depot	Australia	Record daily precipitation	5.1 mm (0.20 in)	8 of 100 (Routine)
Harrisburg - Coop	United States	Record high minimum temperature	18.3 C (64.9 F)	8 of 100 (Routine)
Rapid City Forrest	Canada	Record daily precipitation	24.9 mm (1.0 in)	7 of 100 (Routine)
Altastenberg	Germany	Record high minimum temperature	13.6 C (56.5 F)	6 of 100 (Routine)
Arnsberg	Germany	Record high maximum temperature	28.6 C (83.5 F)	6 of 100 (Routine)
Sheffield	United Kingdom	Record daily precipitation	19.8 mm (0.8 in)	4 of 100 (Routine)
Karlshamn	Sweden	Record high maximum temperature	24.0 C (75.2 F)	3 of 100 (Routine)
Roseworthy	Australia	Record daily precipitation	5.6 mm (0.22 in)	2 of 100 (Routine)
Bonang	Australia	Record daily precipitation	12.7 mm (0.5 in)	2 of 100 (Routine)
Melton	Australia	Record daily precipitation	7.6 mm (0.30 in)	2 of 100 (Routine)
Harnosand	Sweden	Record high minimum temperature	7.0 C (44.6 F)	2 of 100 (Routine)
Kristianstad	Sweden	Record high maximum temperature	23.0 C (73.4 F)	2 of 100 (Routine)
Boolcoomatta	Australia	Record daily precipitation	6.4 mm (0.25 in)	1 of 100 (Routine)
Bukalong Station	Australia	Record daily precipitation	3.3 mm (0.13 in)	1 of 100 (Routine)
Qacu (Bos)	South Africa	Record daily precipitation	2.5 mm (0.10 in)	1 of 100 (Routine)
Vineland	United States	Record high minimum temperature	18.3 C (64.9 F)	1 of 100 (Routine)

Counts by Type and Timescale

51 records

Records set or tied on 21 May 1918 by type: Highest daily maximum 13, Lowest daily maximum 3, Highest daily minimum 12, Lowest daily minimum 1, Heaviest daily rainfall 19, Heaviest daily snowfall 3.

Records on 21 May 1918 by type
Record type	Records
Highest daily maximum	13
Lowest daily maximum	3
Highest daily minimum	12
Lowest daily minimum	1
Heaviest daily rainfall	19
Heaviest daily snowfall	3
Deepest snow cover	0

Records on 21 May 1918 by timescale: all-time 0, monthly 0, daily 51.

How Much Records Were Beaten By

41 broken records

Margins by which the 41 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 63.0. Ties are not counted.

Top 20 by Significance

21 May 1918

Top 20 records on 21 May 1918 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 May 1918	Oxford, GB	daily high max	27.6 C (81.7 F)	1.5 C (2.7 F)	97 years	42 of 100 (Notable)
21 May 1918	Dubuque River, US	daily rain	40.9 mm (1.6 in)	17.5 mm (0.7 in)	8 years	22 of 100 (Routine)
21 May 1918	Dublin Phoenix Park, IE	daily high max	24.4 C (75.9 F)	0.8 C (1.4 F)	47 years	21 of 100 (Routine)
21 May 1918	World Trade Ctr, US	daily rain	33.0 mm (1.3 in)	8.6 mm (0.34 in)	34 years	21 of 100 (Routine)
21 May 1918	Springbok, ZA	daily rain	11.7 mm (0.5 in)	7.9 mm (0.31 in)	29 years	20 of 100 (Routine)
21 May 1918	Haparanda, SE	daily rain	5.6 mm (0.22 in)	0.3 mm (0.01 in)	48 years	20 of 100 (Routine)
21 May 1918	Portland, US	daily high min	15.6 C (60.1 F)	1.7 C (3.1 F)	37 years	20 of 100 (Routine)
21 May 1918	Tobolsk, RU	daily rain	6.7 mm (0.26 in)	3.3 mm (0.13 in)	32 years	18 of 100 (Routine)
21 May 1918	Armagh, GB	daily high max	23.1 C (73.6 F)	1.0 C (1.8 F)	28 years	18 of 100 (Routine)
21 May 1918	Edmonton, CA	daily low min	-3.9 C (25.0 F)	2.8 C (5.0 F)	29 years	17 of 100 (Routine)
21 May 1918	Hillview, CA	daily rain	26.2 mm (1.0 in)	10.2 mm (0.4 in)	9 years	17 of 100 (Routine)
21 May 1918	Nicosia, CY	daily rain	7.6 mm (0.30 in)	4.9 mm (0.19 in)	34 years	17 of 100 (Routine)
21 May 1918	Worcester, ZA	daily rain	8.4 mm (0.33 in)	4.6 mm (0.18 in)	29 years	17 of 100 (Routine)
21 May 1918	Cet Central England, GB	daily high max	26.7 C (80.1 F)	2.5 C (4.5 F)	28 years	17 of 100 (Routine)
21 May 1918	Durham, GB	daily high min	13.3 C (55.9 F)	3.3 C (5.9 F)	8 years	16 of 100 (Routine)
21 May 1918	Prince Albert, CA	daily low max	9.4 C (48.9 F)	2.3 C (4.1 F)	30 years	15 of 100 (Routine)
21 May 1918	Minnedosa, CA	daily snowfall	0.3 cm (0.1 in)	0.3 cm (0.1 in)	36 years	15 of 100 (Routine)
21 May 1918	Nuwara Eliya, LK	daily low max	15.6 C (60.1 F)	1.0 C (1.8 F)	18 years	15 of 100 (Routine)
21 May 1918	Qu'appelle, CA	daily snowfall	11.4 cm (4.5 in)	6.3 cm (2.5 in)	9 years	14 of 100 (Routine)
21 May 1918	Orebro, SE	daily high min	11.0 C (51.8 F)	1.0 C (1.8 F)	31 years	14 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 1918

Records set or tied on this calendar date in each year from 1793 to 1918. 1918 had 51 records.

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

Records on 05-21 in each year
Year	Records
1793	1
1795	1
1811	1
1837	2
1842	1
1847	2
1854	1
1857	1
1858	1
1865	1
1866	1
1870	2
1875	1
1876	1
1880	2
1882	1
1885	1
1886	2
1887	3
1889	5
1890	3
1891	6
1892	1
1893	1
1894	4
1895	4
1896	5
1897	2
1898	1
1899	5
1900	1
1901	3
1902	4
1903	26
1904	8
1905	7
1906	12
1907	36
1908	13
1909	13
1910	14
1911	87
1912	24
1913	13
1914	26
1915	24
1916	13
1917	76
1918	51
1919	170
1920	39
1921	158
1922	39
1923	125
1924	148
1925	250
1926	221
1927	207
1928	173
1929	247
1930	133
1931	488
1932	343
1933	290
1934	590
1935	190
1936	328
1937	227
1938	348
1939	355
1940	456
1941	525
1942	482
1943	463
1944	310
1945	515
1946	324
1947	485
1948	312
1949	593
1950	403
1951	271
1952	385
1953	501
1954	961
1955	507
1956	409
1957	709
1958	511
1959	684
1960	615
1961	306
1962	553
1963	598
1964	788
1965	238
1966	296
1967	1,022
1968	549
1969	832
1970	449
1971	536
1972	557
1973	493
1974	847
1975	1,160
1976	393
1977	756
1978	575
1979	787
1980	857
1981	1,550
1982	599
1983	1,106
1984	950
1985	610
1986	908
1987	1,242
1988	819
1989	671
1990	947
1991	1,065
1992	1,143
1993	1,197
1994	656
1995	749
1996	1,461
1997	953
1998	1,200
1999	544
2000	897
2001	1,187
2002	2,048
2003	807
2004	898
2005	1,020
2006	810
2007	894
2008	740
2009	1,315
2010	962
2011	959
2012	848
2013	884
2014	522
2015	956
2016	567
2017	780
2018	525
2019	1,668
2020	707
2021	1,131
2022	1,512
2023	794
2024	751
2025	776
2026	356

Download the Data

Data for records on 1918-05-21: 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 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Margin	Records
0 to 10	38
10 to 20	2
20 to 30	0
30 to 40	0
40 to 50	0
50 to 60	0
60 to 70	1