Weather Records on 21 May 1970

449 weather records were set or tied worldwide on 21 May 1970. Highest significance: Motihari, IN.

Key Facts for 21 May 1970

On 21 May 1970, 449 weather records were set or tied at long-record stations worldwide.
284 were record highs and 34 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 18 monthly and 430 daily.
Motihari set a daily record precipitation of 72.0 mm (2.8 in) on 21 May 1970.
Across 156 earlier years (1793 to 2026) the same calendar date averaged 460 records.

Record Map

449 stations

449 station records on 21 May 1970 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 May 1970: highest significance records shown on the map
Station	Country	Type	Value	Significance
Motihari	India	Record daily precipitation	72.0 mm (2.8 in)	59 of 100 (Notable)
Blackfoot Fire Dept	United States	Record daily precipitation	37.3 mm (1.5 in)	57 of 100 (Notable)
Oconto 4 W	United States	Record daily precipitation	51.6 mm (2.0 in)	56 of 100 (Notable)
Jamalpur	India	Record daily precipitation	48.8 mm (1.9 in)	50 of 100 (Notable)
Perungalur	India	Record daily precipitation	90.0 mm (3.5 in)	49 of 100 (Notable)
Brocken	Germany	Record snow depth	90.0 cm (35.4 in)	48 of 100 (Notable)
Bagaha	India	Record daily precipitation	52.0 mm (2.0 in)	43 of 100 (Notable)
Anucino	Russia	Record daily precipitation	37.2 mm (1.5 in)	42 of 100 (Notable)
Escanaba	United States	Record daily precipitation	25.1 mm (1.0 in)	41 of 100 (Notable)
Ft Hall 1 NNE	United States	Record daily precipitation	41.4 mm (1.6 in)	40 of 100 (Notable)
Columbus	United States	Record daily precipitation	56.6 mm (2.2 in)	40 of 100 (Notable)
Gonda	India	Record daily precipitation	70.2 mm (2.8 in)	37 of 100 (Notable)
Ramnagar Sr	India	Record daily precipitation	41.6 mm (1.6 in)	36 of 100 (Notable)
Nanpara	India	Record daily precipitation	44.4 mm (1.7 in)	36 of 100 (Notable)
Bettiah	India	Record daily precipitation	29.0 mm (1.1 in)	34 of 100 (Routine)
Broadus	United States	Record daily precipitation	26.4 mm (1.0 in)	34 of 100 (Routine)
Mahua	India	Record daily precipitation	59.0 mm (2.3 in)	33 of 100 (Routine)
Beloit	United States	Record high minimum temperature	22.2 C (72.0 F)	33 of 100 (Routine)
Coupeville 1 S	United States	Record low minimum temperature	2.8 C (37.0 F)	33 of 100 (Routine)
Buffalo	United States	Record daily precipitation	50.8 mm (2.0 in)	33 of 100 (Routine)
Hampton	United States	Record high minimum temperature	20.6 C (69.1 F)	32 of 100 (Routine)
Mackinaw City 2	United States	Record high minimum temperature	12.8 C (55.0 F)	32 of 100 (Routine)
Mystic Lake	United States	Record daily precipitation	37.8 mm (1.5 in)	32 of 100 (Routine)
Chardzhev	Turkmenistan	Record high minimum temperature	23.1 C (73.6 F)	31 of 100 (Routine)
Palacode	India	Record daily precipitation	40.0 mm (1.6 in)	30 of 100 (Routine)
Elkader 6 SSW	United States	Record high minimum temperature	20.0 C (68.0 F)	30 of 100 (Routine)
Marshalltown	United States	Record high minimum temperature	26.1 C (79.0 F)	30 of 100 (Routine)
Aberdeen Exp STN	United States	Record daily precipitation	38.1 mm (1.5 in)	29 of 100 (Routine)
Britt 3E	United States	Record high minimum temperature	23.3 C (73.9 F)	29 of 100 (Routine)
Decorah	United States	Record high minimum temperature	20.6 C (69.1 F)	29 of 100 (Routine)
Chilton	United States	Record high maximum temperature	30.6 C (87.1 F)	29 of 100 (Routine)
Dodgeville Wwtp	United States	Record high minimum temperature	17.8 C (64.0 F)	29 of 100 (Routine)
Rantoul	United States	Record high maximum temperature	32.8 C (91.0 F)	29 of 100 (Routine)
Gladwin	United States	Record high maximum temperature	31.1 C (88.0 F)	29 of 100 (Routine)
Joliet	United States	Record high maximum temperature	31.1 C (88.0 F)	29 of 100 (Routine)
Kumbhakonam	India	Record daily precipitation	39.0 mm (1.5 in)	28 of 100 (Routine)
Guthrie Ctr	United States	Record high minimum temperature	20.0 C (68.0 F)	28 of 100 (Routine)
Northwood	United States	Record high minimum temperature	18.9 C (66.0 F)	28 of 100 (Routine)
Rockwell City	United States	Record high minimum temperature	20.6 C (69.1 F)	28 of 100 (Routine)
Caledonia	United States	Record high minimum temperature	19.4 C (66.9 F)	28 of 100 (Routine)
Farmington 3NW	United States	Record high minimum temperature	19.4 C (66.9 F)	28 of 100 (Routine)
Wyola 1 SW	United States	Record daily precipitation	30.7 mm (1.2 in)	28 of 100 (Routine)
Manitowoc	United States	Record high maximum temperature	30.6 C (87.1 F)	28 of 100 (Routine)
Mauston 1 SE	United States	Record high minimum temperature	17.8 C (64.0 F)	28 of 100 (Routine)
Tower 2S	United States	Record daily precipitation	38.9 mm (1.5 in)	27 of 100 (Routine)
Rochester Intl AP	United States	Record high minimum temperature	18.3 C (64.9 F)	27 of 100 (Routine)
Pocatello Rgnl AP	United States	Record daily precipitation	32.8 mm (1.3 in)	27 of 100 (Routine)
Webster City	United States	Record high minimum temperature	20.6 C (69.1 F)	26 of 100 (Routine)
Ludington 4 SE	United States	Record high minimum temperature	14.4 C (57.9 F)	26 of 100 (Routine)
Wisconsin Dells Wwtp	United States	Record high minimum temperature	19.4 C (66.9 F)	26 of 100 (Routine)
Lnai Culture & Heritage Ctr	United States	Record low minimum temperature	11.7 C (53.1 F)	26 of 100 (Routine)
Waratah (Mount Road)	Australia	Record daily precipitation	27.9 mm (1.1 in)	25 of 100 (Routine)
Maranguape	Brazil	Record daily precipitation	54.4 mm (2.1 in)	25 of 100 (Routine)
Louriya	India	Record daily precipitation	39.0 mm (1.5 in)	25 of 100 (Routine)
Waynesboro 2 S	United States	Record low minimum temperature	10.6 C (51.1 F)	25 of 100 (Routine)
Mason City	United States	Record high maximum temperature	33.9 C (93.0 F)	25 of 100 (Routine)
Mason City	United States	Record high minimum temperature	20.0 C (68.0 F)	25 of 100 (Routine)
Neillsville 3ESE	United States	Record high minimum temperature	19.4 C (66.9 F)	25 of 100 (Routine)
Greenfield	United States	Record high minimum temperature	19.4 C (66.9 F)	24 of 100 (Routine)
New Hampton	United States	Record high minimum temperature	19.4 C (66.9 F)	24 of 100 (Routine)

Counts by Type and Timescale

449 records

Records set or tied on 21 May 1970 by type: Highest daily maximum 120, Lowest daily maximum 8, Highest daily minimum 164, Lowest daily minimum 26, Heaviest daily rainfall 128, Deepest snow cover 3.

Records on 21 May 1970 by type
Record type	Records
Highest daily maximum	120
Lowest daily maximum	8
Highest daily minimum	164
Lowest daily minimum	26
Heaviest daily rainfall	128
Heaviest daily snowfall	0
Deepest snow cover	3

Records on 21 May 1970 by timescale: all-time 1, monthly 18, daily 430.

How Much Records Were Beaten By

345 broken records

Margins by which the 345 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 620.0. Ties are not counted.

Top 20 by Significance

21 May 1970

Top 20 records on 21 May 1970 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 May 1970	Motihari, IN	daily rain	72.0 mm (2.8 in)	57.0 mm (2.2 in)	47 years	59 of 100 (Notable)
21 May 1970	Blackfoot Fire Dept, US	daily rain	37.3 mm (1.5 in)	17.0 mm (0.7 in)	70 years	57 of 100 (Notable)
21 May 1970	Oconto 4 W, US	daily rain	51.6 mm (2.0 in)	28.7 mm (1.1 in)	56 years	56 of 100 (Notable)
21 May 1970	Jamalpur, IN	daily rain	48.8 mm (1.9 in)	30.5 mm (1.2 in)	57 years	50 of 100 (Notable)
21 May 1970	Perungalur, IN	daily rain	90.0 mm (3.5 in)	85.9 mm (3.4 in)	20 years	49 of 100 (Notable)
21 May 1970	Brocken, DE	daily snow depth	90.0 cm (35.4 in)	62.0 cm (24.4 in)	68 years	48 of 100 (Notable)
21 May 1970	Bagaha, IN	daily rain	52.0 mm (2.0 in)	36.8 mm (1.4 in)	60 years	43 of 100 (Notable)
21 May 1970	Anucino, RU	daily rain	37.2 mm (1.5 in)	26.9 mm (1.1 in)	13 years	42 of 100 (Notable)
21 May 1970	Escanaba, US	daily rain	25.1 mm (1.0 in)	4.3 mm (0.17 in)	87 years	41 of 100 (Notable)
21 May 1970	Ft Hall 1 NNE, US	monthly rain	41.4 mm (1.6 in)	9.4 mm (0.37 in)	28 years	40 of 100 (Notable)
21 May 1970	Columbus, US	daily rain	56.6 mm (2.2 in)	29.9 mm (1.2 in)	17 years	40 of 100 (Notable)
21 May 1970	Gonda, IN	daily rain	70.2 mm (2.8 in)	38.7 mm (1.5 in)	24 years	37 of 100 (Notable)
21 May 1970	Ramnagar Sr, IN	daily rain	41.6 mm (1.6 in)	29.7 mm (1.2 in)	47 years	36 of 100 (Notable)
21 May 1970	Nanpara, IN	daily rain	44.4 mm (1.7 in)	27.9 mm (1.1 in)	29 years	36 of 100 (Notable)
21 May 1970	Bettiah, IN	daily rain	29.0 mm (1.1 in)	13.8 mm (0.5 in)	60 years	34 of 100 (Routine)
21 May 1970	Broadus, US	daily rain	26.4 mm (1.0 in)	10.7 mm (0.4 in)	47 years	34 of 100 (Routine)
21 May 1970	Mahua, IN	daily rain	59.0 mm (2.3 in)	31.6 mm (1.2 in)	15 years	33 of 100 (Routine)
21 May 1970	Beloit, US	daily high min	22.2 C (72.0 F)	3.9 C (7.0 F)	65 years	33 of 100 (Routine)
21 May 1970	Coupeville 1 S, US	daily low min	2.8 C (37.0 F)	1.1 C (2.0 F)	73 years	33 of 100 (Routine)
21 May 1970	Buffalo, US	monthly rain	50.8 mm (2.0 in)	1.3 mm (0.05 in)	53 years	33 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 1970

Records set or tied on this calendar date in each year from 1793 to 1970. 1970 had 449 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 1970-05-21: 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 2026-10-15 (15 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 100	343
100 to 200	1
200 to 300	0
300 to 400	0
400 to 500	0
500 to 600	0
600 to 700	1