Weather Records on 21 May 1930

133 weather records were set or tied worldwide on 21 May 1930. Highest significance: Edmonton, CA.

Key Facts for 21 May 1930

On 21 May 1930, 133 weather records were set or tied at long-record stations worldwide.
80 were record highs and 29 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 2 monthly and 131 daily.
Edmonton set a daily record snowfall of 19.1 cm (7.5 in) on 21 May 1930.
Across 156 earlier years (1793 to 2026) the same calendar date averaged 462 records.

Record Map

133 stations

133 station records on 21 May 1930 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 May 1930: highest significance records shown on the map
Station	Country	Type	Value	Significance
Edmonton	Canada	Record daily snowfall	19.1 cm (7.5 in)	27 of 100 (Routine)
Windsor Kings College	Canada	Record low maximum temperature	8.3 C (46.9 F)	21 of 100 (Routine)
Mc Minnville	United States	Record daily precipitation	16.0 mm (0.6 in)	20 of 100 (Routine)
Forest Grove	United States	Record daily precipitation	21.1 mm (0.8 in)	20 of 100 (Routine)
Headworks Portland Wtr B	United States	Record daily precipitation	24.9 mm (1.0 in)	20 of 100 (Routine)
Independence	United States	Record high minimum temperature	20.0 C (68.0 F)	20 of 100 (Routine)
Marburg - Warrego Highway	Australia	Record daily precipitation	13.7 mm (0.5 in)	19 of 100 (Routine)
Sydney	Canada	Record low maximum temperature	4.4 C (39.9 F)	19 of 100 (Routine)
Biskra	Algeria	Record high maximum temperature	39.0 C (102.2 F)	18 of 100 (Routine)
Whitefish Pt	United States	Record high maximum temperature	29.4 C (84.9 F)	18 of 100 (Routine)
Amenia	United States	Record high maximum temperature	33.9 C (93.0 F)	18 of 100 (Routine)
The Dalles	United States	Record low maximum temperature	14.4 C (57.9 F)	18 of 100 (Routine)
Dinmore Post Office	Australia	Record daily precipitation	19.1 mm (0.8 in)	17 of 100 (Routine)
Edmonton	Canada	Record low maximum temperature	3.3 C (37.9 F)	17 of 100 (Routine)
Winnipeg St Johns Coll	Canada	Record high maximum temperature	32.8 C (91.0 F)	17 of 100 (Routine)
Fredericton Unb	Canada	Record low maximum temperature	6.1 C (43.0 F)	17 of 100 (Routine)
Vernal	United States	Record low maximum temperature	11.7 C (53.1 F)	17 of 100 (Routine)
Battleford	Canada	Record daily snowfall	0.5 cm (0.2 in)	16 of 100 (Routine)
Winnipeg St Johns Coll	Canada	Record high minimum temperature	15.0 C (59.0 F)	16 of 100 (Routine)
Umea	Sweden	Record high minimum temperature	9.5 C (49.1 F)	16 of 100 (Routine)
Grafton	United States	Record high maximum temperature	34.4 C (93.9 F)	16 of 100 (Routine)
Lancaster 4 WSW	United States	Record high maximum temperature	30.6 C (87.1 F)	16 of 100 (Routine)
Zillmere Post Office	Australia	Record daily precipitation	20.3 mm (0.8 in)	15 of 100 (Routine)
Cumbalum (Fairview)	Australia	Record daily precipitation	32.5 mm (1.3 in)	15 of 100 (Routine)
Nanaimo	Canada	Record daily precipitation	8.6 mm (0.34 in)	15 of 100 (Routine)
St. Petersburg	Russia	Record high maximum temperature	28.5 C (83.3 F)	15 of 100 (Routine)
Hallock	United States	Record high maximum temperature	32.8 C (91.0 F)	15 of 100 (Routine)
Napoleon	United States	Record high minimum temperature	14.4 C (57.9 F)	15 of 100 (Routine)
Gainesville	United States	Record high minimum temperature	26.1 C (79.0 F)	15 of 100 (Routine)
Nevada City	United States	Record low minimum temperature	-1.7 C (28.9 F)	14 of 100 (Routine)
Steele 4N	United States	Record high maximum temperature	30.0 C (86.0 F)	14 of 100 (Routine)
Cascade Locks	United States	Record daily precipitation	20.8 mm (0.8 in)	14 of 100 (Routine)
Cairns Post Office	Australia	Record high maximum temperature	31.7 C (89.1 F)	13 of 100 (Routine)
Wittstock-Rote Muhle	Germany	Record daily precipitation	13.9 mm (0.5 in)	13 of 100 (Routine)
Cambridge Water Trmt P	United States	Record low minimum temperature	6.7 C (44.1 F)	13 of 100 (Routine)
Detroit Lakes 1 NNE	United States	Record high minimum temperature	14.4 C (57.9 F)	13 of 100 (Routine)
Ashley	United States	Record high minimum temperature	13.3 C (55.9 F)	13 of 100 (Routine)
Mayville	United States	Record high maximum temperature	32.2 C (90.0 F)	13 of 100 (Routine)
Wahpeton 3 N	United States	Record high minimum temperature	15.6 C (60.1 F)	13 of 100 (Routine)
Ust-Sugor	Russia	Record daily precipitation	9.1 mm (0.36 in)	12 of 100 (Routine)
Granite Reef Dam	United States	Record high minimum temperature	21.1 C (70.0 F)	12 of 100 (Routine)
Saint Maries	United States	Record low maximum temperature	9.4 C (48.9 F)	12 of 100 (Routine)
Alma	United States	Record high minimum temperature	17.8 C (64.0 F)	12 of 100 (Routine)
New Bremen	United States	Record high maximum temperature	31.7 C (89.1 F)	12 of 100 (Routine)
Kennewick	United States	Record low maximum temperature	18.3 C (64.9 F)	12 of 100 (Routine)
Oxley Post Office	Australia	Record daily precipitation	7.1 mm (0.28 in)	11 of 100 (Routine)
Clifton Post Office	Australia	Record daily precipitation	5.6 mm (0.22 in)	11 of 100 (Routine)
Oconto 4 W	United States	Record high maximum temperature	28.9 C (84.0 F)	11 of 100 (Routine)
Bald Hills Post Office	Australia	Record daily precipitation	8.9 mm (0.35 in)	10 of 100 (Routine)
Bowraville Recreation Club	Australia	Record daily precipitation	18.3 mm (0.7 in)	10 of 100 (Routine)
Oakbank	Canada	Record high maximum temperature	31.1 C (88.0 F)	10 of 100 (Routine)
Harnosand	Sweden	Record high minimum temperature	9.0 C (48.2 F)	10 of 100 (Routine)
Crookston NW Exp STN	United States	Record high maximum temperature	33.3 C (91.9 F)	10 of 100 (Routine)
Menno	United States	Record high maximum temperature	30.6 C (87.1 F)	10 of 100 (Routine)
Snoqualmie Falls	United States	Record low maximum temperature	12.2 C (54.0 F)	10 of 100 (Routine)
Landsborough Post Office	Australia	Record daily precipitation	16.5 mm (0.6 in)	9 of 100 (Routine)
Hay River	Canada	Record low minimum temperature	-10.0 C (14.0 F)	9 of 100 (Routine)
Chita	Russia	Record low minimum temperature	-4.8 C (23.4 F)	9 of 100 (Routine)
New Ulm 2 SE	United States	Record high maximum temperature	31.1 C (88.0 F)	9 of 100 (Routine)
Grand Forks UNIV (NWS)	United States	Record high maximum temperature	33.3 C (91.9 F)	9 of 100 (Routine)

Counts by Type and Timescale

133 records

Records set or tied on 21 May 1930 by type: Highest daily maximum 46, Lowest daily maximum 15, Highest daily minimum 34, Lowest daily minimum 14, Heaviest daily rainfall 22, Heaviest daily snowfall 2.

Records on 21 May 1930 by type
Record type	Records
Highest daily maximum	46
Lowest daily maximum	15
Highest daily minimum	34
Lowest daily minimum	14
Heaviest daily rainfall	22
Heaviest daily snowfall	2
Deepest snow cover	0

Records on 21 May 1930 by timescale: all-time 0, monthly 2, daily 131.

How Much Records Were Beaten By

99 broken records

Margins by which the 99 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 115.0. Ties are not counted.

Top 20 by Significance

21 May 1930

Top 20 records on 21 May 1930 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 May 1930	Edmonton, CA	daily snowfall	19.1 cm (7.5 in)	11.5 cm (4.5 in)	23 years	27 of 100 (Routine)
21 May 1930	Windsor Kings College, CA	daily low max	8.3 C (46.9 F)	1.1 C (2.0 F)	47 years	21 of 100 (Routine)
21 May 1930	Mc Minnville, US	daily rain	16.0 mm (0.6 in)	6.1 mm (0.24 in)	31 years	20 of 100 (Routine)
21 May 1930	Forest Grove, US	daily rain	21.1 mm (0.8 in)	10.2 mm (0.4 in)	8 years	20 of 100 (Routine)
21 May 1930	Headworks Portland Wtr B, US	daily rain	24.9 mm (1.0 in)	8.6 mm (0.34 in)	28 years	20 of 100 (Routine)
21 May 1930	Independence, US	daily high min	20.0 C (68.0 F)	3.9 C (7.0 F)	25 years	20 of 100 (Routine)
21 May 1930	Marburg - Warrego Highway, AU	daily rain	13.7 mm (0.5 in)	5.3 mm (0.21 in)	33 years	19 of 100 (Routine)
21 May 1930	Sydney, CA	daily low max	4.4 C (39.9 F)	2.3 C (4.1 F)	30 years	19 of 100 (Routine)
21 May 1930	Biskra, DZ	daily high max	39.0 C (102.2 F)	1.0 C (1.8 F)	37 years	18 of 100 (Routine)
21 May 1930	Whitefish Pt, US	monthly high max	29.4 C (84.9 F)	0.5 C (0.9 F)	17 years	18 of 100 (Routine)
21 May 1930	Amenia, US	daily high max	33.9 C (93.0 F)	5.0 C (9.0 F)	28 years	18 of 100 (Routine)
21 May 1930	The Dalles, US	daily low max	14.4 C (57.9 F)	3.4 C (6.1 F)	27 years	18 of 100 (Routine)
21 May 1930	Dinmore Post Office, AU	daily rain	19.1 mm (0.8 in)	5.6 mm (0.22 in)	33 years	17 of 100 (Routine)
21 May 1930	Edmonton, CA	daily low max	3.3 C (37.9 F)	3.9 C (7.0 F)	23 years	17 of 100 (Routine)
21 May 1930	Winnipeg St Johns Coll, CA	daily high max	32.8 C (91.0 F)	2.8 C (5.0 F)	29 years	17 of 100 (Routine)
21 May 1930	Fredericton Unb, CA	daily low max	6.1 C (43.0 F)	1.1 C (2.0 F)	30 years	17 of 100 (Routine)
21 May 1930	Vernal, US	daily low max	11.7 C (53.1 F)	3.3 C (5.9 F)	27 years	17 of 100 (Routine)
21 May 1930	Battleford, CA	daily snowfall	0.5 cm (0.2 in)	0.5 cm (0.2 in)	38 years	16 of 100 (Routine)
21 May 1930	Winnipeg St Johns Coll, CA	daily high min	15.0 C (59.0 F)	1.7 C (3.1 F)	28 years	16 of 100 (Routine)
21 May 1930	Umea, SE	daily high min	9.5 C (49.1 F)	3.0 C (5.4 F)	12 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

1793 to 1930

Records set or tied on this calendar date in each year from 1793 to 1930. 1930 had 133 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 1930-05-21: 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 20	98
20 to 40	0
40 to 60	0
60 to 80	0
80 to 100	0
100 to 120	1