Weather Records on 21 April 1971

546 weather records were set or tied worldwide on 21 April 1971. Highest significance: Chasm Falls, US.

Key Facts for 21 April 1971

On 21 April 1971, 546 weather records were set or tied at long-record stations worldwide.
103 were record highs and 171 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 13 monthly and 533 daily.
Chasm Falls set a daily record snow depth of 78.7 cm (31.0 in) on 21 April 1971.
Across 159 earlier years (1793 to 2026) the same calendar date averaged 462 records.

Record Map

546 stations

546 station records on 21 April 1971 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 April 1971: highest significance records shown on the map
Station	Country	Type	Value	Significance
Chasm Falls	United States	Record snow depth	78.7 cm (31.0 in)	55 of 100 (Notable)
Dickinson Exp STN	United States	Record daily precipitation	31.8 mm (1.3 in)	52 of 100 (Notable)
Frankford (Rossville)	Australia	Record daily precipitation	60.5 mm (2.4 in)	48 of 100 (Notable)
Indaial	Brazil	Record daily precipitation	63.2 mm (2.5 in)	47 of 100 (Notable)
Garcia	Brazil	Record daily precipitation	83.0 mm (3.3 in)	47 of 100 (Notable)
Paisley	United States	Record daily snowfall	15.2 cm (6.0 in)	45 of 100 (Notable)
Hollister 1 SW	United States	Record low minimum temperature	-5.0 C (23.0 F)	44 of 100 (Notable)
Nova Bremen	Brazil	Record daily precipitation	58.0 mm (2.3 in)	43 of 100 (Notable)
Summit	United States	Record daily precipitation	29.7 mm (1.2 in)	43 of 100 (Notable)
Charleston	United States	Record daily precipitation	101.1 mm (4.0 in)	42 of 100 (Notable)
Winnebago	United States	Record daily precipitation	25.9 mm (1.0 in)	42 of 100 (Notable)
Rosedale	United States	Record daily precipitation	102.9 mm (4.1 in)	41 of 100 (Notable)
Stanley 3 NNW	United States	Record daily precipitation	30.0 mm (1.2 in)	41 of 100 (Notable)
Hana 354	United States	Record daily precipitation	62.0 mm (2.4 in)	40 of 100 (Notable)
Apiuna -Regua Nova (Pcd)	Brazil	Record daily precipitation	54.2 mm (2.1 in)	39 of 100 (Notable)
Avalon Pleasure Pier	United States	Record low minimum temperature	2.8 C (37.0 F)	38 of 100 (Notable)
Taio (Pcd)	Brazil	Record daily precipitation	59.2 mm (2.3 in)	37 of 100 (Notable)
Ibirama (Pcd)	Brazil	Record daily precipitation	51.3 mm (2.0 in)	36 of 100 (Notable)
Willcox	United States	Record low minimum temperature	-11.7 C (10.9 F)	36 of 100 (Notable)
Batesville	United States	Record daily precipitation	50.8 mm (2.0 in)	36 of 100 (Notable)
Timbo Novo (Pcd)	Brazil	Record daily precipitation	50.0 mm (2.0 in)	35 of 100 (Notable)
Cotegipe	Brazil	Record daily precipitation	84.4 mm (3.3 in)	35 of 100 (Notable)
Redwood Falls Muni AP	United States	Record daily precipitation	26.2 mm (1.0 in)	35 of 100 (Notable)
Harwell	Australia	Record daily precipitation	28.7 mm (1.1 in)	34 of 100 (Routine)
Bowdle	United States	Record daily precipitation	32.5 mm (1.3 in)	34 of 100 (Routine)
Enid Dam	United States	Record daily precipitation	88.9 mm (3.5 in)	32 of 100 (Routine)
Kennebec	United States	Record daily precipitation	32.8 mm (1.3 in)	32 of 100 (Routine)
Itoupava Central	Brazil	Record daily precipitation	43.0 mm (1.7 in)	31 of 100 (Routine)
Gormanston (Gould Street)	Australia	Record daily precipitation	76.2 mm (3.0 in)	30 of 100 (Routine)
Benedito Novo	Brazil	Record daily precipitation	43.0 mm (1.7 in)	29 of 100 (Routine)
Itatinga E5-013	Brazil	Record daily precipitation	37.9 mm (1.5 in)	29 of 100 (Routine)
Waynesboro	United States	Record high maximum temperature	31.1 C (88.0 F)	29 of 100 (Routine)
Vancouver 4 NNE	United States	Record low minimum temperature	-1.1 C (30.0 F)	29 of 100 (Routine)
Lakeview 2 NNW	United States	Record daily snowfall	5.1 cm (2.0 in)	28 of 100 (Routine)
Haleakala Rs 338	United States	Record daily precipitation	39.4 mm (1.6 in)	28 of 100 (Routine)
Deeral	Australia	Record daily precipitation	114.3 mm (4.5 in)	27 of 100 (Routine)
Brooks Ahrc	Canada	Record high minimum temperature	6.7 C (44.1 F)	27 of 100 (Routine)
Pogranichnyj	Russia	Record high maximum temperature	29.0 C (84.2 F)	27 of 100 (Routine)
Mt Vernon	United States	Record high maximum temperature	31.1 C (88.0 F)	27 of 100 (Routine)
Washington 1 W	United States	Record high minimum temperature	17.2 C (63.0 F)	27 of 100 (Routine)
Grinnell 3 SW	United States	Record high maximum temperature	30.0 C (86.0 F)	27 of 100 (Routine)
Coffeeville	United States	Record daily precipitation	96.0 mm (3.8 in)	27 of 100 (Routine)
Ruby Lake Nwr	United States	Record daily snowfall	6.4 cm (2.5 in)	27 of 100 (Routine)
Gladstone (Old Post Office)	Australia	Record daily precipitation	25.4 mm (1.0 in)	26 of 100 (Routine)
Pabellon Campo Experimental	Mexico	Record low minimum temperature	0.6 C (33.1 F)	26 of 100 (Routine)
Los Gatos	United States	Record low minimum temperature	0.6 C (33.1 F)	26 of 100 (Routine)
Academy 2NE	United States	Record daily precipitation	41.1 mm (1.6 in)	26 of 100 (Routine)
Ketchikan AP	United States	Record low maximum temperature	3.3 C (37.9 F)	26 of 100 (Routine)
Pouso Redondo	Brazil	Record daily precipitation	74.0 mm (2.9 in)	25 of 100 (Routine)
Korf	Russia	Record low minimum temperature	-23.0 C (-9.4 F)	25 of 100 (Routine)
Clarksburg	United States	Record low minimum temperature	-1.1 C (30.0 F)	25 of 100 (Routine)
Newman	United States	Record low minimum temperature	-0.6 C (30.9 F)	25 of 100 (Routine)
Yreka	United States	Record low maximum temperature	5.0 C (41.0 F)	25 of 100 (Routine)
Gage	United States	Record low minimum temperature	-3.3 C (26.1 F)	25 of 100 (Routine)
Fort Huachuca	United States	Record low maximum temperature	17.8 C (64.0 F)	25 of 100 (Routine)
Sharpes Siding	Australia	Record daily precipitation	39.6 mm (1.6 in)	24 of 100 (Routine)
Arrozeira	Brazil	Record daily precipitation	30.0 mm (1.2 in)	24 of 100 (Routine)
Colinet	Canada	Record high minimum temperature	6.7 C (44.1 F)	24 of 100 (Routine)
San Francisco de Los Romo (Sm	Mexico	Record low minimum temperature	1.7 C (35.1 F)	24 of 100 (Routine)
Saint Bernard	United States	Record high maximum temperature	31.1 C (88.0 F)	24 of 100 (Routine)

Counts by Type and Timescale

546 records

Records set or tied on 21 April 1971 by type: Highest daily maximum 60, Lowest daily maximum 75, Highest daily minimum 43, Lowest daily minimum 96, Heaviest daily rainfall 230, Heaviest daily snowfall 25, Deepest snow cover 17.

Records on 21 April 1971 by type
Record type	Records
Highest daily maximum	60
Lowest daily maximum	75
Highest daily minimum	43
Lowest daily minimum	96
Heaviest daily rainfall	230
Heaviest daily snowfall	25
Deepest snow cover	17

Records on 21 April 1971 by timescale: all-time 0, monthly 13, daily 533.

How Much Records Were Beaten By

442 broken records

Margins by which the 442 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 660.0. Ties are not counted.

Top 20 by Significance

21 April 1971

Top 20 records on 21 April 1971 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 April 1971	Chasm Falls, US	daily snow depth	78.7 cm (31.0 in)	66.0 cm (26.0 in)	38 years	55 of 100 (Notable)
21 April 1971	Dickinson Exp STN, US	daily rain	31.8 mm (1.3 in)	15.0 mm (0.6 in)	73 years	52 of 100 (Notable)
21 April 1971	Frankford (Rossville), AU	daily rain	60.5 mm (2.4 in)	32.6 mm (1.3 in)	45 years	48 of 100 (Notable)
21 April 1971	Indaial, BR	daily rain	63.2 mm (2.5 in)	46.8 mm (1.8 in)	28 years	47 of 100 (Notable)
21 April 1971	Garcia, BR	daily rain	83.0 mm (3.3 in)	68.8 mm (2.7 in)	13 years	47 of 100 (Notable)
21 April 1971	Paisley, US	daily snowfall	15.2 cm (6.0 in)	10.1 cm (4.0 in)	45 years	45 of 100 (Notable)
21 April 1971	Hollister 1 SW, US	monthly low min	-5.0 C (23.0 F)	1.7 C (3.1 F)	74 years	44 of 100 (Notable)
21 April 1971	Nova Bremen, BR	daily rain	58.0 mm (2.3 in)	53.2 mm (2.1 in)	2 years	43 of 100 (Notable)
21 April 1971	Summit, US	daily rain	29.7 mm (1.2 in)	17.3 mm (0.7 in)	30 years	43 of 100 (Notable)
21 April 1971	Charleston, US	daily rain	101.1 mm (4.0 in)	44.7 mm (1.8 in)	49 years	42 of 100 (Notable)
21 April 1971	Winnebago, US	daily rain	25.9 mm (1.0 in)	13.5 mm (0.5 in)	66 years	42 of 100 (Notable)
21 April 1971	Rosedale, US	daily rain	102.9 mm (4.1 in)	60.7 mm (2.4 in)	4 years	41 of 100 (Notable)
21 April 1971	Stanley 3 NNW, US	daily rain	30.0 mm (1.2 in)	23.4 mm (0.9 in)	16 years	41 of 100 (Notable)
21 April 1971	Hana 354, US	daily rain	62.0 mm (2.4 in)	34.6 mm (1.4 in)	40 years	40 of 100 (Notable)
21 April 1971	Apiuna -Regua Nova (Pcd), BR	daily rain	54.2 mm (2.1 in)	42.1 mm (1.7 in)	2 years	39 of 100 (Notable)
21 April 1971	Avalon Pleasure Pier, US	monthly low min	2.8 C (37.0 F)	2.2 C (4.0 F)	42 years	38 of 100 (Notable)
21 April 1971	Taio (Pcd), BR	daily rain	59.2 mm (2.3 in)	27.2 mm (1.1 in)	38 years	37 of 100 (Notable)
21 April 1971	Ibirama (Pcd), BR	daily rain	51.3 mm (2.0 in)	40.0 mm (1.6 in)	13 years	36 of 100 (Notable)
21 April 1971	Willcox, US	daily low min	-11.7 C (10.9 F)	5.0 C (9.0 F)	58 years	36 of 100 (Notable)
21 April 1971	Batesville, US	daily rain	50.8 mm (2.0 in)	10.2 mm (0.4 in)	78 years	36 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 1971

Records set or tied on this calendar date in each year from 1793 to 1971. 1971 had 546 records.

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

Records on 04-21 in each year
Year	Records
1793	1
1814	1
1820	1
1838	1
1849	2
1851	1
1852	3
1854	1
1858	3
1861	2
1865	3
1866	1
1868	1
1870	1
1875	4
1876	2
1877	1
1879	3
1880	1
1881	1
1882	1
1884	1
1885	2
1888	1
1890	1
1891	1
1892	1
1893	2
1894	4
1895	1
1897	1
1898	2
1899	2
1900	7
1901	17
1902	7
1903	3
1904	10
1905	18
1906	5
1907	17
1908	25
1909	20
1910	33
1911	9
1912	22
1913	14
1914	220
1915	24
1916	64
1917	48
1918	84
1919	31
1920	85
1921	59
1922	70
1923	223
1924	119
1925	295
1926	148
1927	284
1928	269
1929	193
1930	127
1931	358
1932	304
1933	201
1934	497
1935	266
1936	277
1937	416
1938	295
1939	110
1940	462
1941	306
1942	285
1943	481
1944	261
1945	367
1946	448
1947	459
1948	365
1949	448
1950	529
1951	884
1952	665
1953	640
1954	527
1955	607
1956	497
1957	824
1958	329
1959	505
1960	889
1961	647
1962	319
1963	778
1964	1,125
1965	658
1966	756
1967	903
1968	655
1969	388
1970	728
1971	546
1972	593
1973	1,163
1974	528
1975	360
1976	452
1977	854
1978	735
1979	449
1980	1,934
1981	944
1982	1,075
1983	1,366
1984	1,231
1985	1,245
1986	977
1987	1,290
1988	898
1989	1,557
1990	1,463
1991	1,291
1992	1,763
1993	847
1994	859
1995	1,476
1996	788
1997	964
1998	876
1999	752
2000	921
2001	967
2002	1,312
2003	607
2004	586
2005	693
2006	761
2007	480
2008	1,327
2009	983
2010	805
2011	1,053
2012	687
2013	1,015
2014	393
2015	621
2016	587
2017	797
2018	862
2019	731
2020	397
2021	1,608
2022	433
2023	886
2024	754
2025	506
2026	853

Download the Data

Data for records on 1971-04-21: 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 100	437
100 to 200	3
200 to 300	1
300 to 400	0
400 to 500	0
500 to 600	0
600 to 700	1