Weather Records on 21 April 1977

854 weather records were set or tied worldwide on 21 April 1977. Highest significance: Vasilevici, BY.

Key Facts for 21 April 1977

On 21 April 1977, 854 weather records were set or tied at long-record stations worldwide.
370 were record highs and 136 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 26 monthly and 827 daily.
Vasilevici set a monthly record daily precipitation of 55.5 mm (2.2 in) on 21 April 1977.
Across 159 earlier years (1793 to 2026) the same calendar date averaged 460 records.

Record Map

854 stations

854 station records on 21 April 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 April 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Vasilevici	Belarus	Record daily precipitation	55.5 mm (2.2 in)	78 of 100 (Major)
Abbeville	United States	Record daily precipitation	148.6 mm (5.9 in)	64 of 100 (Major)
Amite	United States	Record daily precipitation	169.9 mm (6.7 in)	62 of 100 (Major)
Melville	United States	Record daily precipitation	144.8 mm (5.7 in)	59 of 100 (Notable)
Reserve	United States	Record daily precipitation	149.9 mm (5.9 in)	55 of 100 (Notable)
Angleton 2 W	United States	Record daily precipitation	108.2 mm (4.3 in)	55 of 100 (Notable)
Hammond	United States	Record daily precipitation	141.2 mm (5.6 in)	54 of 100 (Notable)
Usina Do Chicao	Brazil	Record daily precipitation	42.4 mm (1.7 in)	52 of 100 (Notable)
Pine Grove Fire Twr	United States	Record daily precipitation	175.8 mm (6.9 in)	50 of 100 (Notable)
Acatlan de Osorio (Smn)	Mexico	Record low maximum temperature	20.6 C (69.1 F)	49 of 100 (Notable)
Bocaina (Fazenda Santa Clara)	Brazil	Record daily precipitation	52.2 mm (2.1 in)	48 of 100 (Notable)
Gouvea	Brazil	Record daily precipitation	57.0 mm (2.2 in)	47 of 100 (Notable)
Careacu	Brazil	Record daily precipitation	49.0 mm (1.9 in)	46 of 100 (Notable)
Taquaracu	Brazil	Record daily precipitation	60.2 mm (2.4 in)	45 of 100 (Notable)
Ponta da Praia	Brazil	Record daily precipitation	84.7 mm (3.3 in)	45 of 100 (Notable)
Port Hastings	Canada	Record high minimum temperature	8.9 C (48.0 F)	45 of 100 (Notable)
Oaknolia 2N	United States	Record daily precipitation	147.3 mm (5.8 in)	45 of 100 (Notable)
Aiuruoca	Brazil	Record daily precipitation	73.8 mm (2.9 in)	44 of 100 (Notable)
Isla Perez	Mexico	Record daily precipitation	26.9 mm (1.1 in)	44 of 100 (Notable)
Governador Fernando Costa	Brazil	Record daily precipitation	42.5 mm (1.7 in)	43 of 100 (Notable)
Jeanerette 5 NW	United States	Record daily precipitation	162.6 mm (6.4 in)	43 of 100 (Notable)
Agua Soca	Brazil	Record daily precipitation	32.7 mm (1.3 in)	42 of 100 (Notable)
Grand Coteau	United States	Record daily precipitation	142.2 mm (5.6 in)	42 of 100 (Notable)
Jaboticatubas	Brazil	Record daily precipitation	56.4 mm (2.2 in)	41 of 100 (Notable)
Armagh	United Kingdom	Record high minimum temperature	10.6 C (51.1 F)	41 of 100 (Notable)
Santa Rita Do Massaim	Brazil	Record daily precipitation	48.3 mm (1.9 in)	40 of 100 (Notable)
Donaldsonville 4 SW	United States	Record daily precipitation	152.4 mm (6.0 in)	39 of 100 (Notable)
Meridian Key Fld	United States	Record daily precipitation	100.8 mm (4.0 in)	39 of 100 (Notable)
Carville 2 SW	United States	Record daily precipitation	161.3 mm (6.4 in)	38 of 100 (Notable)
Piranga	Brazil	Record daily precipitation	46.0 mm (1.8 in)	37 of 100 (Notable)
St Hyacinthe	Canada	Record high maximum temperature	26.7 C (80.1 F)	37 of 100 (Notable)
Eldorado Springs	United States	Record daily precipitation	51.8 mm (2.0 in)	37 of 100 (Notable)
Conceicao Do Rio Verde	Brazil	Record daily precipitation	36.6 mm (1.4 in)	36 of 100 (Notable)
Cacapava	Brazil	Record daily precipitation	69.1 mm (2.7 in)	36 of 100 (Notable)
Ubatuba	Brazil	Record daily precipitation	112.9 mm (4.4 in)	36 of 100 (Notable)
Lexington 3E	United States	Record daily precipitation	45.7 mm (1.8 in)	36 of 100 (Notable)
Enosburg Falls	United States	Record high minimum temperature	14.4 C (57.9 F)	36 of 100 (Notable)
Lnai Culture & Heritage Ctr	United States	Record daily precipitation	58.4 mm (2.3 in)	36 of 100 (Notable)
Matias Romero (Smn)	Mexico	Record high maximum temperature	39.4 C (102.9 F)	35 of 100 (Notable)
Lake Arthur 7 SW	United States	Record daily precipitation	167.1 mm (6.6 in)	35 of 100 (Notable)
Standard	United States	Record daily precipitation	89.4 mm (3.5 in)	35 of 100 (Notable)
Woodville 4 ESE	United States	Record daily precipitation	143.5 mm (5.6 in)	35 of 100 (Notable)
Auburn	United States	Record high minimum temperature	13.3 C (55.9 F)	35 of 100 (Notable)
Mc Connellsville Lk 7	United States	Record high minimum temperature	16.1 C (61.0 F)	35 of 100 (Notable)
Virginia	Brazil	Record daily precipitation	43.6 mm (1.7 in)	34 of 100 (Routine)
Observatorio Do Iag	Brazil	Record daily precipitation	35.6 mm (1.4 in)	34 of 100 (Routine)
Itanhaem	Brazil	Record daily precipitation	70.9 mm (2.8 in)	34 of 100 (Routine)
Warren 2 ENE	United States	Record daily precipitation	75.2 mm (3.0 in)	34 of 100 (Routine)
Beaver	United States	Record daily precipitation	34.0 mm (1.3 in)	34 of 100 (Routine)
Alfred	United States	Record high minimum temperature	13.3 C (55.9 F)	34 of 100 (Routine)
Henrietta	United States	Record daily precipitation	60.2 mm (2.4 in)	34 of 100 (Routine)
Wytheville	United States	Record high minimum temperature	13.9 C (57.0 F)	34 of 100 (Routine)
Des Moines	United States	Record daily snowfall	5.1 cm (2.0 in)	33 of 100 (Routine)
Lake Mills Wwtp	United States	Record high minimum temperature	13.3 C (55.9 F)	33 of 100 (Routine)
Usina Congonhal	Brazil	Record daily precipitation	35.6 mm (1.4 in)	32 of 100 (Routine)
Port Hastings	Canada	Record high maximum temperature	25.0 C (77.0 F)	32 of 100 (Routine)
Dublin Phoenix Park	Ireland	Record high minimum temperature	10.8 C (51.4 F)	32 of 100 (Routine)
Aleksandrovsk-Sahalinskij	Russia	Record low maximum temperature	-3.2 C (26.2 F)	32 of 100 (Routine)
Timovskoe	Russia	Record low maximum temperature	-3.9 C (25.0 F)	32 of 100 (Routine)
Vincennes 4 E	United States	Record high minimum temperature	17.2 C (63.0 F)	32 of 100 (Routine)

Counts by Type and Timescale

854 records

Records set or tied on 21 April 1977 by type: Highest daily maximum 101, Lowest daily maximum 59, Highest daily minimum 269, Lowest daily minimum 77, Heaviest daily rainfall 341, Heaviest daily snowfall 4, Deepest snow cover 3.

Records on 21 April 1977 by type
Record type	Records
Highest daily maximum	101
Lowest daily maximum	59
Highest daily minimum	269
Lowest daily minimum	77
Heaviest daily rainfall	341
Heaviest daily snowfall	4
Deepest snow cover	3

Records on 21 April 1977 by timescale: all-time 1, monthly 26, daily 827.

How Much Records Were Beaten By

703 broken records

Margins by which the 703 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 279.0. Ties are not counted.

Top 20 by Significance

21 April 1977

Top 20 records on 21 April 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 April 1977	Vasilevici, BY	monthly rain	55.5 mm (2.2 in)	20.2 mm (0.8 in)	64 years	78 of 100 (Major)
21 April 1977	Abbeville, US	daily rain	148.6 mm (5.9 in)	87.6 mm (3.4 in)	70 years	64 of 100 (Major)
21 April 1977	Amite, US	daily rain	169.9 mm (6.7 in)	131.8 mm (5.2 in)	48 years	62 of 100 (Major)
21 April 1977	Melville, US	daily rain	144.8 mm (5.7 in)	87.6 mm (3.4 in)	44 years	59 of 100 (Notable)
21 April 1977	Reserve, US	daily rain	149.9 mm (5.9 in)	114.8 mm (4.5 in)	28 years	55 of 100 (Notable)
21 April 1977	Angleton 2 W, US	daily rain	108.2 mm (4.3 in)	77.7 mm (3.1 in)	36 years	55 of 100 (Notable)
21 April 1977	Hammond, US	daily rain	141.2 mm (5.6 in)	89.9 mm (3.5 in)	28 years	54 of 100 (Notable)
21 April 1977	Usina Do Chicao, BR	daily rain	42.4 mm (1.7 in)	32.0 mm (1.3 in)	31 years	52 of 100 (Notable)
21 April 1977	Pine Grove Fire Twr, US	daily rain	175.8 mm (6.9 in)	102.9 mm (4.1 in)	28 years	50 of 100 (Notable)
21 April 1977	Acatlan de Osorio (Smn), MX	daily low max	20.6 C (69.1 F)	11.1 C (20.0 F)	20 years	49 of 100 (Notable)
21 April 1977	Bocaina (Fazenda Santa Clara), BR	daily rain	52.2 mm (2.1 in)	36.6 mm (1.4 in)	39 years	48 of 100 (Notable)
21 April 1977	Gouvea, BR	daily rain	57.0 mm (2.2 in)	49.4 mm (1.9 in)	15 years	47 of 100 (Notable)
21 April 1977	Careacu, BR	daily rain	49.0 mm (1.9 in)	42.4 mm (1.7 in)	16 years	46 of 100 (Notable)
21 April 1977	Taquaracu, BR	daily rain	60.2 mm (2.4 in)	38.0 mm (1.5 in)	32 years	45 of 100 (Notable)
21 April 1977	Ponta da Praia, BR	daily rain	84.7 mm (3.3 in)	71.7 mm (2.8 in)	11 years	45 of 100 (Notable)
21 April 1977	Port Hastings, CA	daily high min	8.9 C (48.0 F)	4.5 C (8.1 F)	76 years	45 of 100 (Notable)
21 April 1977	Oaknolia 2N, US	daily rain	147.3 mm (5.8 in)	86.3 mm (3.4 in)	28 years	45 of 100 (Notable)
21 April 1977	Aiuruoca, BR	daily rain	73.8 mm (2.9 in)	48.6 mm (1.9 in)	4 years	44 of 100 (Notable)
21 April 1977	Isla Perez, MX	daily rain	26.9 mm (1.1 in)	26.9 mm (1.1 in)	47 years	44 of 100 (Notable)
21 April 1977	Governador Fernando Costa, BR	daily rain	42.5 mm (1.7 in)	40.6 mm (1.6 in)	4 years	43 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 1977

Records set or tied on this calendar date in each year from 1793 to 1977. 1977 had 854 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 1977-04-21: 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 50	680
50 to 100	19
100 to 150	3
150 to 200	0
200 to 250	0
250 to 300	1