Weather Records on 21 May 1975

1,160 weather records were set or tied worldwide on 21 May 1975. Highest significance: Oestersund-Froesoen, SE.

Key Facts for 21 May 1975

On 21 May 1975, 1,160 weather records were set or tied at long-record stations worldwide.
475 were record highs and 343 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 38 monthly and 1,121 daily.
Oestersund-Froesoen set a daily record precipitation of 33.2 mm (1.3 in) on 21 May 1975.
Across 156 earlier years (1793 to 2026) the same calendar date averaged 456 records.

Record Map

1,160 stations

1,160 station records on 21 May 1975 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 May 1975: highest significance records shown on the map
Station	Country	Type	Value	Significance
Oestersund-Froesoen	Sweden	Record daily precipitation	33.2 mm (1.3 in)	73 of 100 (Major)
Manila	United States	Record daily snowfall	30.5 cm (12.0 in)	65 of 100 (Major)
Valsjon	Sweden	Record daily precipitation	36.8 mm (1.4 in)	62 of 100 (Major)
Coalville	United States	Record daily snowfall	15.2 cm (6.0 in)	62 of 100 (Major)
Ballastviken	Sweden	Record daily precipitation	48.3 mm (1.9 in)	60 of 100 (Major)
Chicago UNIV	United States	Record daily precipitation	71.9 mm (2.8 in)	59 of 100 (Notable)
Peppermint Grove	Australia	Record daily precipitation	46.2 mm (1.8 in)	57 of 100 (Notable)
Twin Falls 3 SE	United States	Record daily precipitation	32.5 mm (1.3 in)	57 of 100 (Notable)
Ibapah	United States	Record daily snowfall	22.9 cm (9.0 in)	56 of 100 (Notable)
Flagstaff AP	United States	Record daily snowfall	11.9 cm (4.7 in)	55 of 100 (Notable)
Kanosh	United States	Record daily snowfall	15.2 cm (6.0 in)	53 of 100 (Notable)
Duved	Sweden	Record daily precipitation	40.0 mm (1.6 in)	52 of 100 (Notable)
Heber	United States	Record daily snowfall	10.2 cm (4.0 in)	51 of 100 (Notable)
Skattungbyn	Sweden	Record daily precipitation	27.7 mm (1.1 in)	50 of 100 (Notable)
Hunge	Sweden	Record daily precipitation	25.9 mm (1.0 in)	50 of 100 (Notable)
Sosjo	Sweden	Record daily precipitation	34.8 mm (1.4 in)	50 of 100 (Notable)
Ft Washakie 1 SE	United States	Record snow depth	35.6 cm (14.0 in)	50 of 100 (Notable)
Norddal	Norway	Record daily precipitation	25.1 mm (1.0 in)	49 of 100 (Notable)
Kjobli I Snaasa	Norway	Record daily precipitation	26.1 mm (1.0 in)	49 of 100 (Notable)
Hollister	United States	Record daily precipitation	33.5 mm (1.3 in)	47 of 100 (Notable)
Levan	United States	Record daily snowfall	7.6 cm (3.0 in)	47 of 100 (Notable)
Ft Washakie 1 SE	United States	Record daily snowfall	15.2 cm (6.0 in)	47 of 100 (Notable)
Tossasen	Sweden	Record daily precipitation	33.3 mm (1.3 in)	46 of 100 (Notable)
Manila	United States	Record daily precipitation	25.4 mm (1.0 in)	45 of 100 (Notable)
Border 3 N	United States	Record daily snowfall	7.6 cm (3.0 in)	45 of 100 (Notable)
Ratan	Sweden	Record daily precipitation	32.4 mm (1.3 in)	44 of 100 (Notable)
Jackvik	Sweden	Record daily precipitation	49.8 mm (2.0 in)	44 of 100 (Notable)
Benton Harbor AP	United States	Record daily precipitation	37.6 mm (1.5 in)	44 of 100 (Notable)
Ostas I Hegra	Norway	Record daily precipitation	41.8 mm (1.6 in)	43 of 100 (Notable)
Semenovka	Armenia	Record daily precipitation	27.3 mm (1.1 in)	42 of 100 (Notable)
Nephi	United States	Record daily snowfall	7.6 cm (3.0 in)	42 of 100 (Notable)
Port Lincoln	Australia	Record high minimum temperature	17.6 C (63.7 F)	40 of 100 (Notable)
Huntingdon	Canada	Record high minimum temperature	18.3 C (64.9 F)	40 of 100 (Notable)
San Diego de Alejandria	Mexico	Record daily precipitation	42.9 mm (1.7 in)	40 of 100 (Notable)
Ft Kent	United States	Record daily precipitation	37.3 mm (1.5 in)	40 of 100 (Notable)
Morgan	United States	Record daily snowfall	10.2 cm (4.0 in)	40 of 100 (Notable)
Red Lodge	United States	Record daily snowfall	20.3 cm (8.0 in)	39 of 100 (Notable)
Searchlight	United States	Record low minimum temperature	-0.6 C (30.9 F)	39 of 100 (Notable)
Santaquin Chlorinator	United States	Record daily snowfall	7.6 cm (3.0 in)	39 of 100 (Notable)
Pacatuba (Pacatiba)	Brazil	Record daily precipitation	78.6 mm (3.1 in)	38 of 100 (Notable)
Pioche	United States	Record low minimum temperature	-6.1 C (21.0 F)	38 of 100 (Notable)
Toledo Blade	United States	Record high maximum temperature	34.4 C (93.9 F)	38 of 100 (Notable)
Taunton	United States	Record high maximum temperature	33.9 C (93.0 F)	37 of 100 (Notable)
Caliente	United States	Record low maximum temperature	8.9 C (48.0 F)	37 of 100 (Notable)
Fone_D	Sweden	Record daily precipitation	33.8 mm (1.3 in)	36 of 100 (Notable)
Levan	United States	Record snow depth	15.2 cm (6.0 in)	36 of 100 (Notable)
Paragonah	United States	Record low minimum temperature	-5.6 C (21.9 F)	36 of 100 (Notable)
Ljunga	Sweden	Record daily precipitation	25.0 mm (1.0 in)	35 of 100 (Notable)
Columbus Junction	United States	Record daily precipitation	30.5 mm (1.2 in)	35 of 100 (Notable)
New Bedford Coop	United States	Record high maximum temperature	32.8 C (91.0 F)	35 of 100 (Notable)
Greenville 2 NNE	United States	Record daily precipitation	39.4 mm (1.6 in)	35 of 100 (Notable)
Mt Pleasant	United States	Record daily precipitation	45.0 mm (1.8 in)	35 of 100 (Notable)
Rock Springs	United States	Record daily snowfall	5.1 cm (2.0 in)	35 of 100 (Notable)
Grand Junction Walker Fld	United States	Record low maximum temperature	9.4 C (48.9 F)	35 of 100 (Notable)
Frankfort 2NE	United States	Record high minimum temperature	16.7 C (62.1 F)	34 of 100 (Routine)
Gull Lake Biological STN	United States	Record daily precipitation	50.8 mm (2.0 in)	34 of 100 (Routine)
Clover Valley	United States	Record low maximum temperature	7.8 C (46.0 F)	34 of 100 (Routine)
Penedo	Brazil	Record daily precipitation	58.6 mm (2.3 in)	33 of 100 (Routine)
Coruripe	Brazil	Record daily precipitation	166.0 mm (6.5 in)	33 of 100 (Routine)
Hawthorne AP	United States	Record low minimum temperature	0.0 C (32.0 F)	33 of 100 (Routine)

Counts by Type and Timescale

1,160 records

Records set or tied on 21 May 1975 by type: Highest daily maximum 203, Lowest daily maximum 213, Highest daily minimum 272, Lowest daily minimum 130, Heaviest daily rainfall 293, Heaviest daily snowfall 34, Deepest snow cover 15.

Records on 21 May 1975 by type
Record type	Records
Highest daily maximum	203
Lowest daily maximum	213
Highest daily minimum	272
Lowest daily minimum	130
Heaviest daily rainfall	293
Heaviest daily snowfall	34
Deepest snow cover	15

Records on 21 May 1975 by timescale: all-time 1, monthly 38, daily 1,121.

How Much Records Were Beaten By

923 broken records

Margins by which the 923 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 534.0. Ties are not counted.

Top 20 by Significance

21 May 1975

Top 20 records on 21 May 1975 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 May 1975	Oestersund-Froesoen, SE	daily rain	33.2 mm (1.3 in)	19.9 mm (0.8 in)	78 years	73 of 100 (Major)
21 May 1975	Manila, US	daily snowfall	30.5 cm (12.0 in)	30.5 cm (12.0 in)	64 years	65 of 100 (Major)
21 May 1975	Valsjon, SE	monthly rain	36.8 mm (1.4 in)	16.3 mm (0.6 in)	30 years	62 of 100 (Major)
21 May 1975	Coalville, US	daily snowfall	15.2 cm (6.0 in)	15.2 cm (6.0 in)	80 years	62 of 100 (Major)
21 May 1975	Ballastviken, SE	monthly rain	48.3 mm (1.9 in)	18.5 mm (0.7 in)	25 years	60 of 100 (Major)
21 May 1975	Chicago UNIV, US	daily rain	71.9 mm (2.8 in)	56.7 mm (2.2 in)	48 years	59 of 100 (Notable)
21 May 1975	Peppermint Grove, AU	daily rain	46.2 mm (1.8 in)	25.9 mm (1.0 in)	68 years	57 of 100 (Notable)
21 May 1975	Twin Falls 3 SE, US	daily rain	32.5 mm (1.3 in)	19.5 mm (0.8 in)	42 years	57 of 100 (Notable)
21 May 1975	Ibapah, US	daily snowfall	22.9 cm (9.0 in)	17.8 cm (7.0 in)	48 years	56 of 100 (Notable)
21 May 1975	Flagstaff AP, US	daily snowfall	11.9 cm (4.7 in)	11.9 cm (4.7 in)	76 years	55 of 100 (Notable)
21 May 1975	Kanosh, US	daily snowfall	15.2 cm (6.0 in)	15.2 cm (6.0 in)	58 years	53 of 100 (Notable)
21 May 1975	Duved, SE	monthly rain	40.0 mm (1.6 in)	10.7 mm (0.4 in)	37 years	52 of 100 (Notable)
21 May 1975	Heber, US	daily snowfall	10.2 cm (4.0 in)	10.2 cm (4.0 in)	76 years	51 of 100 (Notable)
21 May 1975	Skattungbyn, SE	daily rain	27.7 mm (1.1 in)	19.5 mm (0.8 in)	24 years	50 of 100 (Notable)
21 May 1975	Hunge, SE	daily rain	25.9 mm (1.0 in)	16.9 mm (0.7 in)	25 years	50 of 100 (Notable)
21 May 1975	Sosjo, SE	daily rain	34.8 mm (1.4 in)	24.5 mm (1.0 in)	25 years	50 of 100 (Notable)
21 May 1975	Ft Washakie 1 SE, US	monthly snow depth	35.6 cm (14.0 in)	15.3 cm (6.0 in)	8 years	50 of 100 (Notable)
21 May 1975	Norddal, NO	daily rain	25.1 mm (1.0 in)	11.1 mm (0.4 in)	65 years	49 of 100 (Notable)
21 May 1975	Kjobli I Snaasa, NO	daily rain	26.1 mm (1.0 in)	12.9 mm (0.5 in)	25 years	49 of 100 (Notable)
21 May 1975	Hollister, US	daily rain	33.5 mm (1.3 in)	21.3 mm (0.8 in)	4 years	47 of 100 (Notable)

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 1975

Records set or tied on this calendar date in each year from 1793 to 1975. 1975 had 1,160 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 1975-05-21: 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 2026-10-13 (13 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 100	902
100 to 200	17
200 to 300	1
300 to 400	1
400 to 500	1
500 to 600	1