Weather Records on 21 August 1977

764 weather records were set or tied worldwide on 21 August 1977. Highest significance: Jena Sternwarte, DE.

Key Facts for 21 August 1977

On 21 August 1977, 764 weather records were set or tied at long-record stations worldwide.
245 were record highs and 301 were record lows, counting maximum and minimum temperature.
By timescale, 3 were all-time records, 8 monthly and 753 daily.
Jena Sternwarte set a daily record precipitation of 59.6 mm (2.3 in) on 21 August 1977.
Across 165 earlier years (1800 to 2026) the same calendar date averaged 448 records.

Record Map

764 stations

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

Weather records on 21 August 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Jena Sternwarte	Germany	Record daily precipitation	59.6 mm (2.3 in)	60 of 100 (Major)
Bad Ems	Germany	Record daily precipitation	49.6 mm (2.0 in)	55 of 100 (Notable)
Arnsberg	Germany	Record daily precipitation	36.2 mm (1.4 in)	55 of 100 (Notable)
Kochki	Russia	Record daily precipitation	43.6 mm (1.7 in)	53 of 100 (Notable)
Nerchinskij Zavod	Russia	Record daily precipitation	44.9 mm (1.8 in)	53 of 100 (Notable)
Westcliffe	United States	Record daily precipitation	33.0 mm (1.3 in)	53 of 100 (Notable)
Trenton	United States	Record daily precipitation	102.1 mm (4.0 in)	52 of 100 (Notable)
Nome AP	United States	Record high maximum temperature	27.2 C (81.0 F)	52 of 100 (Notable)
Mathinna (Fingal Road)	Australia	Record daily precipitation	45.9 mm (1.8 in)	49 of 100 (Notable)
Ivdel	Russia	Record daily precipitation	30.6 mm (1.2 in)	49 of 100 (Notable)
Pella 1S	United States	Record daily precipitation	51.1 mm (2.0 in)	47 of 100 (Notable)
Prineville	United States	Record high minimum temperature	17.8 C (64.0 F)	47 of 100 (Notable)
Mohrendorf-Kleinseebach	Germany	Record daily precipitation	53.6 mm (2.1 in)	46 of 100 (Notable)
Center	United States	Record daily precipitation	68.1 mm (2.7 in)	46 of 100 (Notable)
Lagarto	Brazil	Record daily precipitation	41.0 mm (1.6 in)	45 of 100 (Notable)
Budingen	Germany	Record daily precipitation	31.7 mm (1.2 in)	45 of 100 (Notable)
Eslohe	Germany	Record daily precipitation	48.1 mm (1.9 in)	44 of 100 (Notable)
Altastenberg	Germany	Record daily precipitation	30.1 mm (1.2 in)	42 of 100 (Notable)
Metolius 1 W	United States	Record high minimum temperature	16.7 C (62.1 F)	42 of 100 (Notable)
Erie Intl AP	United States	Record daily precipitation	46.7 mm (1.8 in)	41 of 100 (Notable)
Ordynskoe	Russia	Record daily precipitation	28.7 mm (1.1 in)	40 of 100 (Notable)
Krapivino	Russia	Record daily precipitation	27.5 mm (1.1 in)	39 of 100 (Notable)
Condon	United States	Record high minimum temperature	17.2 C (63.0 F)	38 of 100 (Notable)
Madras	United States	Record high minimum temperature	17.8 C (64.0 F)	38 of 100 (Notable)
Moskovo	Russia	Record daily precipitation	30.4 mm (1.2 in)	37 of 100 (Notable)
Sacaton	United States	Record high minimum temperature	29.4 C (84.9 F)	37 of 100 (Notable)
Winter Park	United States	Record daily precipitation	33.0 mm (1.3 in)	37 of 100 (Notable)
Hatton 9 SE	United States	Record high minimum temperature	22.8 C (73.0 F)	37 of 100 (Notable)
Welland	Canada	Record daily precipitation	34.6 mm (1.4 in)	36 of 100 (Notable)
Perkins	Canada	Record daily precipitation	43.2 mm (1.7 in)	36 of 100 (Notable)
La Grange 1N	United States	Record high minimum temperature	22.8 C (73.0 F)	36 of 100 (Notable)
Longview	United States	Record daily precipitation	58.4 mm (2.3 in)	36 of 100 (Notable)
Carcross	Canada	Record high maximum temperature	28.5 C (83.3 F)	35 of 100 (Notable)
Uil	Kazakhstan	Record daily precipitation	55.8 mm (2.2 in)	35 of 100 (Notable)
Heber	United States	Record high minimum temperature	15.0 C (59.0 F)	35 of 100 (Notable)
Waltershausen	Germany	Record daily precipitation	46.8 mm (1.8 in)	34 of 100 (Routine)
Ojo de Agua	Mexico	Record low minimum temperature	10.0 C (50.0 F)	34 of 100 (Routine)
Dayville	United States	Record high minimum temperature	17.8 C (64.0 F)	34 of 100 (Routine)
Sunnyside	United States	Record high minimum temperature	19.4 C (66.9 F)	34 of 100 (Routine)
Enderby	Canada	Record high maximum temperature	33.3 C (91.9 F)	33 of 100 (Routine)
Bloomfield	Canada	Record daily precipitation	26.4 mm (1.0 in)	33 of 100 (Routine)
Liepaja	Latvia	Record low minimum temperature	6.6 C (43.9 F)	33 of 100 (Routine)
Elatma	Russia	Record low maximum temperature	14.9 C (58.8 F)	33 of 100 (Routine)
Mesa	United States	Record high minimum temperature	27.8 C (82.0 F)	33 of 100 (Routine)
Adams	United States	Record low maximum temperature	17.8 C (64.0 F)	33 of 100 (Routine)
Blue Hill Coop	United States	Record low minimum temperature	8.9 C (48.0 F)	33 of 100 (Routine)
Benton Harbor AP	United States	Record low maximum temperature	20.0 C (68.0 F)	33 of 100 (Routine)
Vale	United States	Record high maximum temperature	38.3 C (100.9 F)	33 of 100 (Routine)
Dillingham FAA AP	United States	Record high minimum temperature	16.1 C (61.0 F)	33 of 100 (Routine)
Oskaloosa	United States	Record daily precipitation	40.6 mm (1.6 in)	32 of 100 (Routine)
Winona	United States	Record daily precipitation	28.7 mm (1.1 in)	32 of 100 (Routine)
Minden	United States	Record daily precipitation	31.8 mm (1.3 in)	32 of 100 (Routine)
Hillsboro	United States	Record high minimum temperature	18.9 C (66.0 F)	32 of 100 (Routine)
Heppner	United States	Record high minimum temperature	21.1 C (70.0 F)	32 of 100 (Routine)
Riverside 7 SSW	United States	Record high minimum temperature	21.1 C (70.0 F)	32 of 100 (Routine)
Gainesville	United States	Record low maximum temperature	26.7 C (80.1 F)	32 of 100 (Routine)
Gulkana AP	United States	Record high maximum temperature	30.0 C (86.0 F)	32 of 100 (Routine)
Oudenbosch	Netherlands	Record daily precipitation	44.2 mm (1.7 in)	31 of 100 (Routine)
Elatma	Russia	Record low minimum temperature	3.1 C (37.6 F)	31 of 100 (Routine)
Blagovescensk	Russia	Record daily precipitation	33.7 mm (1.3 in)	31 of 100 (Routine)

Counts by Type and Timescale

764 records

Records set or tied on 21 August 1977 by type: Highest daily maximum 100, Lowest daily maximum 162, Highest daily minimum 145, Lowest daily minimum 139, Heaviest daily rainfall 218.

Records on 21 August 1977 by type
Record type	Records
Highest daily maximum	100
Lowest daily maximum	162
Highest daily minimum	145
Lowest daily minimum	139
Heaviest daily rainfall	218
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 21 August 1977 by timescale: all-time 3, monthly 8, daily 753.

How Much Records Were Beaten By

594 broken records

Margins by which the 594 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 102.1. Ties are not counted.

Top 20 by Significance

21 August 1977

Top 20 records on 21 August 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 August 1977	Jena Sternwarte, DE	daily rain	59.6 mm (2.3 in)	25.1 mm (1.0 in)	35 years	60 of 100 (Major)
21 August 1977	Bad Ems, DE	daily rain	49.6 mm (2.0 in)	30.2 mm (1.2 in)	38 years	55 of 100 (Notable)
21 August 1977	Arnsberg, DE	daily rain	36.2 mm (1.4 in)	14.5 mm (0.6 in)	87 years	55 of 100 (Notable)
21 August 1977	Kochki, RU	daily rain	43.6 mm (1.7 in)	32.0 mm (1.3 in)	32 years	53 of 100 (Notable)
21 August 1977	Nerchinskij Zavod, RU	daily rain	44.9 mm (1.8 in)	19.7 mm (0.8 in)	84 years	53 of 100 (Notable)
21 August 1977	Westcliffe, US	daily rain	33.0 mm (1.3 in)	19.3 mm (0.8 in)	64 years	53 of 100 (Notable)
21 August 1977	Trenton, US	daily rain	102.1 mm (4.0 in)	102.1 mm (4.0 in)	31 years	52 of 100 (Notable)
21 August 1977	Nome AP, US	daily high max	27.2 C (81.0 F)	7.8 C (14.0 F)	68 years	52 of 100 (Notable)
21 August 1977	Mathinna (Fingal Road), AU	daily rain	45.9 mm (1.8 in)	22.8 mm (0.9 in)	67 years	49 of 100 (Notable)
21 August 1977	Ivdel, RU	daily rain	30.6 mm (1.2 in)	24.6 mm (1.0 in)	35 years	49 of 100 (Notable)
21 August 1977	Pella 1S, US	daily rain	51.1 mm (2.0 in)	26.7 mm (1.1 in)	72 years	47 of 100 (Notable)
21 August 1977	Prineville, US	daily high min	17.8 C (64.0 F)	6.1 C (11.0 F)	79 years	47 of 100 (Notable)
21 August 1977	Mohrendorf-Kleinseebach, DE	daily rain	53.6 mm (2.1 in)	30.5 mm (1.2 in)	7 years	46 of 100 (Notable)
21 August 1977	Center, US	daily rain	68.1 mm (2.7 in)	52.9 mm (2.1 in)	35 years	46 of 100 (Notable)
21 August 1977	Lagarto, BR	daily rain	41.0 mm (1.6 in)	21.0 mm (0.8 in)	12 years	45 of 100 (Notable)
21 August 1977	Budingen, DE	daily rain	31.7 mm (1.2 in)	19.0 mm (0.7 in)	44 years	45 of 100 (Notable)
21 August 1977	Eslohe, DE	daily rain	48.1 mm (1.9 in)	23.8 mm (0.9 in)	24 years	44 of 100 (Notable)
21 August 1977	Altastenberg, DE	daily rain	30.1 mm (1.2 in)	6.0 mm (0.24 in)	83 years	42 of 100 (Notable)
21 August 1977	Metolius 1 W, US	daily high min	16.7 C (62.1 F)	5.6 C (10.1 F)	64 years	42 of 100 (Notable)
21 August 1977	Erie Intl AP, US	daily rain	46.7 mm (1.8 in)	29.9 mm (1.2 in)	24 years	41 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

1800 to 1977

Records set or tied on this calendar date in each year from 1800 to 1977. 1977 had 764 records.

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

Records on 08-21 in each year
Year	Records
1800	1
1802	1
1804	1
1807	1
1816	1
1818	1
1832	1
1834	1
1839	3
1843	1
1847	1
1849	3
1850	1
1851	2
1863	1
1866	1
1867	2
1870	3
1871	2
1872	1
1873	1
1876	1
1877	2
1879	2
1884	2
1885	5
1886	1
1887	5
1888	2
1889	3
1890	4
1891	2
1893	4
1894	8
1895	3
1896	2
1897	4
1898	4
1899	7
1900	4
1901	9
1902	8
1903	6
1904	8
1905	4
1906	22
1907	20
1908	13
1909	17
1910	33
1911	19
1912	50
1913	37
1914	24
1915	21
1916	106
1917	101
1918	202
1919	19
1920	59
1921	34
1922	58
1923	111
1924	135
1925	220
1926	227
1927	228
1928	110
1929	234
1930	297
1931	277
1932	264
1933	328
1934	320
1935	318
1936	807
1937	762
1938	239
1939	630
1940	683
1941	180
1942	415
1943	438
1944	346
1945	544
1946	390
1947	954
1948	305
1949	508
1950	958
1951	699
1952	368
1953	331
1954	497
1955	885
1956	701
1957	490
1958	389
1959	704
1960	490
1961	644
1962	469
1963	338
1964	794
1965	455
1966	661
1967	541
1968	1,014
1969	650
1970	373
1971	660
1972	441
1973	438
1974	564
1975	545
1976	756
1977	764
1978	445
1979	778
1980	904
1981	1,015
1982	769
1983	1,407
1984	975
1985	623
1986	1,166
1987	740
1988	889
1989	828
1990	910
1991	828
1992	957
1993	698
1994	968
1995	962
1996	950
1997	1,291
1998	948
1999	717
2000	861
2001	797
2002	965
2003	1,241
2004	1,585
2005	1,071
2006	797
2007	1,829
2008	1,012
2009	1,319
2010	1,155
2011	1,022
2012	990
2013	513
2014	624
2015	651
2016	890
2017	347
2018	816
2019	631
2020	1,147
2021	767
2022	917
2023	1,826
2024	777
2025	1,230
2026	1,289

Download the Data

Data for records on 1977-08-21: 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 2026-10-12 (12 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	577
20 to 40	15
40 to 60	1
60 to 80	0
80 to 100	0
100 to 120	1