Weather Records on 20 May 1918

92 weather records were set or tied worldwide on 20 May 1918. Highest significance: Grenfell, CA.

Key Facts for 20 May 1918

On 20 May 1918, 92 weather records were set or tied at long-record stations worldwide.
22 were record highs and 8 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 0 monthly and 92 daily.
Grenfell set a daily record snowfall of 24.4 cm (9.6 in) on 20 May 1918.
Across 162 earlier years (1802 to 2026) the same calendar date averaged 458 records.

Record Map

92 stations

92 station records on 20 May 1918 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 May 1918: highest significance records shown on the map
Station	Country	Type	Value	Significance
Grenfell	Canada	Record daily snowfall	24.4 cm (9.6 in)	53 of 100 (Notable)
Mortlake	Australia	Record daily precipitation	27.7 mm (1.1 in)	32 of 100 (Routine)
Woods Point	Australia	Record daily precipitation	30.5 mm (1.2 in)	26 of 100 (Routine)
Daylesford	Australia	Record daily precipitation	29.2 mm (1.1 in)	25 of 100 (Routine)
Oxford	United Kingdom	Record high maximum temperature	27.4 C (81.3 F)	25 of 100 (Routine)
Warragul	Australia	Record daily precipitation	26.9 mm (1.1 in)	24 of 100 (Routine)
Kardella (Fleetwood)	Australia	Record daily precipitation	28.7 mm (1.1 in)	23 of 100 (Routine)
Chaplin	Canada	Record daily snowfall	5.1 cm (2.0 in)	23 of 100 (Routine)
Hamilton	Canada	Record high minimum temperature	18.9 C (66.0 F)	23 of 100 (Routine)
Rokewood (Kuruc A Ruc)	Australia	Record daily precipitation	19.1 mm (0.8 in)	20 of 100 (Routine)
Kirov	Russia	Record daily precipitation	17.8 mm (0.7 in)	20 of 100 (Routine)
Casterton (Nangeela)	Australia	Record daily precipitation	24.6 mm (1.0 in)	20 of 100 (Routine)
Yalta	Ukraine	Record daily precipitation	9.8 mm (0.39 in)	20 of 100 (Routine)
Foster (Post Office)	Australia	Record daily precipitation	18.3 mm (0.7 in)	20 of 100 (Routine)
Rosedale	Australia	Record daily precipitation	19.8 mm (0.8 in)	20 of 100 (Routine)
Cowes	Australia	Record daily precipitation	23.6 mm (0.9 in)	20 of 100 (Routine)
Sterkstroom (Pol)	South Africa	Record daily precipitation	15.7 mm (0.6 in)	20 of 100 (Routine)
Beechworth Composite	Australia	Record daily precipitation	19.1 mm (0.8 in)	20 of 100 (Routine)
Warburton	Australia	Record daily precipitation	23.1 mm (0.9 in)	20 of 100 (Routine)
Port Albert	Australia	Record daily precipitation	9.7 mm (0.38 in)	19 of 100 (Routine)
Dromana	Australia	Record daily precipitation	27.4 mm (1.1 in)	19 of 100 (Routine)
Ballan	Australia	Record daily precipitation	11.9 mm (0.5 in)	17 of 100 (Routine)
Vasteras-Hasslo	Sweden	Record high minimum temperature	10.0 C (50.0 F)	17 of 100 (Routine)
Stradbroke Post Office	Australia	Record daily precipitation	11.7 mm (0.5 in)	16 of 100 (Routine)
Harnosand	Sweden	Record high minimum temperature	8.0 C (46.4 F)	16 of 100 (Routine)
Warrangong	Australia	Record daily precipitation	2.5 mm (0.10 in)	15 of 100 (Routine)
Kergunyah South	Australia	Record daily precipitation	16.3 mm (0.6 in)	15 of 100 (Routine)
Rokewood (the Meadows)	Australia	Record daily precipitation	11.4 mm (0.4 in)	15 of 100 (Routine)
Colac Botanical Gardens	Australia	Record daily precipitation	19.1 mm (0.8 in)	15 of 100 (Routine)
Halifax	Canada	Record high minimum temperature	11.1 C (52.0 F)	15 of 100 (Routine)
Vanersborg	Sweden	Record high maximum temperature	23.0 C (73.4 F)	15 of 100 (Routine)
Sussex	Australia	Record daily precipitation	1.3 mm (0.05 in)	14 of 100 (Routine)
Cobar (the Meadows)	Australia	Record daily precipitation	0.8 mm (0.03 in)	14 of 100 (Routine)
Cape Schanck Lighthouse	Australia	Record daily precipitation	13.0 mm (0.5 in)	14 of 100 (Routine)
Winchelsea (Murdeduke)	Australia	Record daily precipitation	10.2 mm (0.4 in)	14 of 100 (Routine)
Orebro	Sweden	Record high maximum temperature	24.0 C (75.2 F)	14 of 100 (Routine)
Bjuraker	Sweden	Record high minimum temperature	7.0 C (44.6 F)	14 of 100 (Routine)
Walhalla	Australia	Record daily precipitation	21.3 mm (0.8 in)	13 of 100 (Routine)
Yan Yean	Australia	Record daily precipitation	10.4 mm (0.4 in)	13 of 100 (Routine)
Rapid City Forrest	Canada	Record daily snowfall	0.8 cm (0.3 in)	13 of 100 (Routine)
Halifax	Canada	Record high maximum temperature	25.6 C (78.1 F)	13 of 100 (Routine)
Kristianstad	Sweden	Record high maximum temperature	24.5 C (76.1 F)	13 of 100 (Routine)
Orebro	Sweden	Record high minimum temperature	10.5 C (50.9 F)	13 of 100 (Routine)
Stornoway Airport	United Kingdom	Record high minimum temperature	10.0 C (50.0 F)	13 of 100 (Routine)
Cowra Post Office	Australia	Record daily precipitation	1.3 mm (0.05 in)	12 of 100 (Routine)
Wandin (Yallock)	Australia	Record daily precipitation	15.2 mm (0.6 in)	12 of 100 (Routine)
Qu'appelle	Canada	Record low maximum temperature	3.3 C (37.9 F)	12 of 100 (Routine)
Qu'appelle	Canada	Record daily snowfall	5.1 cm (2.0 in)	12 of 100 (Routine)
Durham	United Kingdom	Record high maximum temperature	23.9 C (75.0 F)	12 of 100 (Routine)
Harden (East St)	Australia	Record daily precipitation	3.3 mm (0.13 in)	11 of 100 (Routine)
Moama	Australia	Record daily precipitation	4.3 mm (0.17 in)	11 of 100 (Routine)
Sale	Australia	Record daily precipitation	13.0 mm (0.5 in)	11 of 100 (Routine)
Sale Mercury Office	Australia	Record daily precipitation	13.0 mm (0.5 in)	11 of 100 (Routine)
Sunbury (Salesian College )	Australia	Record daily precipitation	8.9 mm (0.35 in)	11 of 100 (Routine)
Belle Isle	Canada	Record low minimum temperature	-6.7 C (19.9 F)	11 of 100 (Routine)
Storrs	United States	Record low minimum temperature	2.2 C (36.0 F)	11 of 100 (Routine)
Carcoar	Australia	Record daily precipitation	4.6 mm (0.18 in)	10 of 100 (Routine)
Barkerville	Canada	Record low maximum temperature	5.0 C (41.0 F)	10 of 100 (Routine)
Pooncarie (Mulurulu Station)	Australia	Record daily precipitation	3.8 mm (0.15 in)	9 of 100 (Routine)
Crookwell Post Office	Australia	Record daily precipitation	6.4 mm (0.25 in)	9 of 100 (Routine)

Counts by Type and Timescale

92 records

Records set or tied on 20 May 1918 by type: Highest daily maximum 12, Lowest daily maximum 4, Highest daily minimum 10, Lowest daily minimum 4, Heaviest daily rainfall 56, Heaviest daily snowfall 6.

Records on 20 May 1918 by type
Record type	Records
Highest daily maximum	12
Lowest daily maximum	4
Highest daily minimum	10
Lowest daily minimum	4
Heaviest daily rainfall	56
Heaviest daily snowfall	6
Deepest snow cover	0

Records on 20 May 1918 by timescale: all-time 0, monthly 0, daily 92.

How Much Records Were Beaten By

80 broken records

Margins by which the 80 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 244.0. Ties are not counted.

Top 20 by Significance

20 May 1918

Top 20 records on 20 May 1918 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 May 1918	Grenfell, CA	daily snowfall	24.4 cm (9.6 in)	24.4 cm (9.6 in)	33 years	53 of 100 (Notable)
20 May 1918	Mortlake, AU	daily rain	27.7 mm (1.1 in)	13.2 mm (0.5 in)	11 years	32 of 100 (Routine)
20 May 1918	Woods Point, AU	daily rain	30.5 mm (1.2 in)	19.1 mm (0.8 in)	23 years	26 of 100 (Routine)
20 May 1918	Daylesford, AU	daily rain	29.2 mm (1.1 in)	13.5 mm (0.5 in)	18 years	25 of 100 (Routine)
20 May 1918	Oxford, GB	daily high max	27.4 C (81.3 F)	0.6 C (1.1 F)	47 years	25 of 100 (Routine)
20 May 1918	Warragul, AU	daily rain	26.9 mm (1.1 in)	12.9 mm (0.5 in)	22 years	24 of 100 (Routine)
20 May 1918	Kardella (Fleetwood), AU	daily rain	28.7 mm (1.1 in)	11.7 mm (0.5 in)	22 years	23 of 100 (Routine)
20 May 1918	Chaplin, CA	daily snowfall	5.1 cm (2.0 in)	5.1 cm (2.0 in)	33 years	23 of 100 (Routine)
20 May 1918	Hamilton, CA	daily high min	18.9 C (66.0 F)	3.3 C (5.9 F)	39 years	23 of 100 (Routine)
20 May 1918	Rokewood (Kuruc A Ruc), AU	daily rain	19.1 mm (0.8 in)	15.0 mm (0.6 in)	16 years	20 of 100 (Routine)
20 May 1918	Kirov, RU	daily rain	17.8 mm (0.7 in)	8.2 mm (0.32 in)	34 years	20 of 100 (Routine)
20 May 1918	Casterton (Nangeela), AU	daily rain	24.6 mm (1.0 in)	8.6 mm (0.34 in)	23 years	20 of 100 (Routine)
20 May 1918	Yalta, UA	daily rain	9.8 mm (0.39 in)	6.1 mm (0.24 in)	31 years	20 of 100 (Routine)
20 May 1918	Foster (Post Office), AU	daily rain	18.3 mm (0.7 in)	10.2 mm (0.4 in)	29 years	20 of 100 (Routine)
20 May 1918	Rosedale, AU	daily rain	19.8 mm (0.8 in)	14.2 mm (0.6 in)	5 years	20 of 100 (Routine)
20 May 1918	Cowes, AU	daily rain	23.6 mm (0.9 in)	7.1 mm (0.28 in)	28 years	20 of 100 (Routine)
20 May 1918	Sterkstroom (Pol), ZA	daily rain	15.7 mm (0.6 in)	9.9 mm (0.39 in)	25 years	20 of 100 (Routine)
20 May 1918	Beechworth Composite, AU	daily rain	19.1 mm (0.8 in)	4.6 mm (0.18 in)	43 years	20 of 100 (Routine)
20 May 1918	Warburton, AU	daily rain	23.1 mm (0.9 in)	4.8 mm (0.19 in)	37 years	20 of 100 (Routine)
20 May 1918	Port Albert, AU	daily rain	9.7 mm (0.38 in)	2.1 mm (0.08 in)	40 years	19 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

1802 to 1918

Records set or tied on this calendar date in each year from 1802 to 1918. 1918 had 92 records.

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

Records on 05-20 in each year
Year	Records
1802	1
1803	1
1804	1
1815	1
1825	1
1837	1
1844	1
1845	3
1847	1
1854	1
1858	3
1861	1
1862	1
1865	1
1867	1
1868	2
1870	3
1871	2
1876	2
1877	3
1879	1
1880	2
1884	2
1885	1
1887	2
1889	3
1890	3
1891	5
1892	3
1893	1
1894	6
1895	3
1896	3
1897	3
1898	4
1899	4
1900	1
1901	5
1902	11
1903	19
1904	4
1905	4
1906	22
1907	35
1908	23
1909	10
1910	20
1911	82
1912	20
1913	10
1914	16
1915	42
1916	29
1917	46
1918	92
1919	56
1920	44
1921	234
1922	40
1923	125
1924	189
1925	251
1926	128
1927	118
1928	138
1929	323
1930	129
1931	451
1932	689
1933	449
1934	582
1935	259
1936	207
1937	270
1938	331
1939	266
1940	337
1941	378
1942	337
1943	802
1944	315
1945	498
1946	339
1947	358
1948	514
1949	586
1950	327
1951	288
1952	615
1953	518
1954	822
1955	421
1956	565
1957	728
1958	378
1959	785
1960	612
1961	333
1962	773
1963	732
1964	517
1965	200
1966	416
1967	587
1968	743
1969	885
1970	310
1971	653
1972	612
1973	419
1974	893
1975	1,332
1976	837
1977	553
1978	534
1979	683
1980	751
1981	1,540
1982	554
1983	1,307
1984	867
1985	426
1986	790
1987	1,036
1988	805
1989	764
1990	722
1991	925
1992	1,200
1993	1,208
1994	778
1995	734
1996	1,749
1997	1,106
1998	1,124
1999	673
2000	991
2001	847
2002	2,299
2003	1,201
2004	746
2005	929
2006	1,006
2007	565
2008	999
2009	1,529
2010	1,011
2011	1,117
2012	604
2013	919
2014	629
2015	1,001
2016	692
2017	1,214
2018	460
2019	1,483
2020	784
2021	904
2022	1,643
2023	1,106
2024	478
2025	969
2026	696

Download the Data

Data for records on 1918-05-20: 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 50	78
50 to 100	1
100 to 150	0
150 to 200	0
200 to 250	1