Weather Records on 21 August 1978

445 weather records were set or tied worldwide on 21 August 1978. Highest significance: Jakutsk, RU.

Key Facts for 21 August 1978

On 21 August 1978, 445 weather records were set or tied at long-record stations worldwide.
96 were record highs and 185 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 13 monthly and 432 daily.
Jakutsk set a daily record precipitation of 28.1 mm (1.1 in) on 21 August 1978.
Across 165 earlier years (1800 to 2026) the same calendar date averaged 450 records.

Record Map

445 stations

445 station records on 21 August 1978 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 August 1978: highest significance records shown on the map
Station	Country	Type	Value	Significance
Jakutsk	Russia	Record daily precipitation	28.1 mm (1.1 in)	69 of 100 (Major)
Mc Cook	United States	Record daily precipitation	63.5 mm (2.5 in)	54 of 100 (Notable)
Isabela Substn	Puerto Rico [United States]	Record daily precipitation	84.3 mm (3.3 in)	53 of 100 (Notable)
Isit	Russia	Record daily precipitation	53.0 mm (2.1 in)	49 of 100 (Notable)
Sand I Ryfylke II	Norway	Record daily precipitation	54.9 mm (2.2 in)	48 of 100 (Notable)
Mercedes 6 SSE	United States	Record daily precipitation	76.2 mm (3.0 in)	46 of 100 (Notable)
Juzhno-Sahalinsk	Russia	Record daily precipitation	67.1 mm (2.6 in)	45 of 100 (Notable)
Cherokee	United States	Record daily precipitation	65.3 mm (2.6 in)	45 of 100 (Notable)
Rock 1 E	United States	Record daily precipitation	73.7 mm (2.9 in)	44 of 100 (Notable)
Manley Hot Springs	United States	Record daily precipitation	29.0 mm (1.1 in)	43 of 100 (Notable)
Borinquen AP	Puerto Rico [United States]	Record daily precipitation	67.6 mm (2.7 in)	42 of 100 (Notable)
Sovetskaja Gavan	Russia	Record daily precipitation	28.0 mm (1.1 in)	37 of 100 (Notable)
Nevelsk	Russia	Record daily precipitation	52.3 mm (2.1 in)	35 of 100 (Notable)
Trona	United States	Record low minimum temperature	10.0 C (50.0 F)	35 of 100 (Notable)
Alexandria	United States	Record daily precipitation	36.8 mm (1.4 in)	35 of 100 (Notable)
Marre-Sale	Russia	Record low maximum temperature	-0.4 C (31.3 F)	34 of 100 (Routine)
Sangary	Russia	Record daily precipitation	25.4 mm (1.0 in)	34 of 100 (Routine)
Biser	Russia	Record low minimum temperature	-1.2 C (29.8 F)	34 of 100 (Routine)
Laguna Beach	United States	Record low minimum temperature	4.4 C (39.9 F)	33 of 100 (Routine)
Escarcega (Smn)	Mexico	Record daily precipitation	53.8 mm (2.1 in)	32 of 100 (Routine)
Uglegorsk	Russia	Record daily precipitation	49.1 mm (1.9 in)	32 of 100 (Routine)
McKenzie Rvr Rs	United States	Record low maximum temperature	15.6 C (60.1 F)	32 of 100 (Routine)
Tonti (Bos)	South Africa	Record daily precipitation	60.5 mm (2.4 in)	31 of 100 (Routine)
Ganca	Azerbaijan	Record low minimum temperature	12.4 C (54.3 F)	30 of 100 (Routine)
Sauda	Norway	Record daily precipitation	40.6 mm (1.6 in)	30 of 100 (Routine)
Vladikavkaz	Russia	Record low minimum temperature	9.0 C (48.2 F)	30 of 100 (Routine)
Silver Lake Brighton	United States	Record high minimum temperature	13.3 C (55.9 F)	30 of 100 (Routine)
Kalihi Rsch Site 777	United States	Record daily precipitation	48.3 mm (1.9 in)	30 of 100 (Routine)
Manoa Tun 2 716	United States	Record daily precipitation	52.3 mm (2.1 in)	30 of 100 (Routine)
Nuuanu Rsch 4 783	United States	Record daily precipitation	47.2 mm (1.9 in)	30 of 100 (Routine)
Kazalinsk	Kazakhstan	Record low minimum temperature	7.3 C (45.1 F)	29 of 100 (Routine)
San Carlos Rsvr	United States	Record high minimum temperature	25.0 C (77.0 F)	29 of 100 (Routine)
Fergana	Uzbekistan	Record low maximum temperature	22.7 C (72.9 F)	29 of 100 (Routine)
Magiscatzin (Smn)	Mexico	Record low minimum temperature	12.8 C (55.0 F)	28 of 100 (Routine)
Borovici	Russia	Record daily precipitation	31.8 mm (1.3 in)	28 of 100 (Routine)
Santa Fe del Rio	Mexico	Record low maximum temperature	20.6 C (69.1 F)	27 of 100 (Routine)
Dolinsk	Russia	Record daily precipitation	46.6 mm (1.8 in)	27 of 100 (Routine)
Korsakov	Russia	Record daily precipitation	31.3 mm (1.2 in)	26 of 100 (Routine)
Boquilla Numero Uno	Mexico	Record high maximum temperature	39.4 C (102.9 F)	25 of 100 (Routine)
Karsakpaj	Kazakhstan	Record low maximum temperature	15.9 C (60.6 F)	24 of 100 (Routine)
Bakke	Norway	Record daily precipitation	29.2 mm (1.1 in)	24 of 100 (Routine)
Khudjand	Tajikistan	Record low maximum temperature	22.9 C (73.2 F)	24 of 100 (Routine)
Ashland	United States	Record low maximum temperature	16.1 C (61.0 F)	24 of 100 (Routine)
Medford Intl AP	United States	Record low maximum temperature	16.1 C (61.0 F)	24 of 100 (Routine)
Avalon Pleasure Pier	United States	Record high maximum temperature	27.2 C (81.0 F)	23 of 100 (Routine)
Green Mt Dam	United States	Record low minimum temperature	-4.4 C (24.1 F)	23 of 100 (Routine)
Hamakuapoko 485	United States	Record daily precipitation	38.9 mm (1.5 in)	23 of 100 (Routine)
Clyde A	Canada	Record daily snowfall	11.0 cm (4.3 in)	22 of 100 (Routine)
Balhash	Kazakhstan	Record low minimum temperature	6.7 C (44.1 F)	22 of 100 (Routine)
Kokpekty	Kazakhstan	Record low maximum temperature	16.4 C (61.5 F)	22 of 100 (Routine)
San Julian (Dge)	Mexico	Record daily precipitation	52.8 mm (2.1 in)	22 of 100 (Routine)
Selagoncy	Russia	Record daily precipitation	27.5 mm (1.1 in)	22 of 100 (Routine)
Esengyly	Turkmenistan	Record low maximum temperature	27.5 C (81.5 F)	22 of 100 (Routine)
Waynesboro 2 S	United States	Record high maximum temperature	37.8 C (100.0 F)	22 of 100 (Routine)
Antelope 6 SSW	United States	Record low maximum temperature	15.0 C (59.0 F)	22 of 100 (Routine)
Forest Grove	United States	Record low maximum temperature	17.8 C (64.0 F)	22 of 100 (Routine)
Katanning Comparison	Australia	Record high minimum temperature	11.4 C (52.5 F)	21 of 100 (Routine)
Turkestan	Kazakhstan	Record low minimum temperature	10.0 C (50.0 F)	21 of 100 (Routine)
Nizhne-Tambovskoe	Russia	Record daily precipitation	48.2 mm (1.9 in)	21 of 100 (Routine)
Jaen (Instituto)	Spain	Record high maximum temperature	38.3 C (100.9 F)	21 of 100 (Routine)

Counts by Type and Timescale

445 records

Records set or tied on 21 August 1978 by type: Highest daily maximum 44, Lowest daily maximum 111, Highest daily minimum 52, Lowest daily minimum 74, Heaviest daily rainfall 163, Heaviest daily snowfall 1.

Records on 21 August 1978 by type
Record type	Records
Highest daily maximum	44
Lowest daily maximum	111
Highest daily minimum	52
Lowest daily minimum	74
Heaviest daily rainfall	163
Heaviest daily snowfall	1
Deepest snow cover	0

Records on 21 August 1978 by timescale: all-time 0, monthly 13, daily 432.

How Much Records Were Beaten By

344 broken records

Margins by which the 344 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 80.0. Ties are not counted.

Top 20 by Significance

21 August 1978

Top 20 records on 21 August 1978 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 August 1978	Jakutsk, RU	daily rain	28.1 mm (1.1 in)	19.6 mm (0.8 in)	84 years	69 of 100 (Major)
21 August 1978	Mc Cook, US	daily rain	63.5 mm (2.5 in)	36.8 mm (1.4 in)	44 years	54 of 100 (Notable)
21 August 1978	Isabela Substn, PR	daily rain	84.3 mm (3.3 in)	55.3 mm (2.2 in)	21 years	53 of 100 (Notable)
21 August 1978	Isit, RU	daily rain	53.0 mm (2.1 in)	33.9 mm (1.3 in)	19 years	49 of 100 (Notable)
21 August 1978	Sand I Ryfylke II, NO	daily rain	54.9 mm (2.2 in)	34.3 mm (1.4 in)	41 years	48 of 100 (Notable)
21 August 1978	Mercedes 6 SSE, US	daily rain	76.2 mm (3.0 in)	58.7 mm (2.3 in)	8 years	46 of 100 (Notable)
21 August 1978	Juzhno-Sahalinsk, RU	daily rain	67.1 mm (2.6 in)	47.1 mm (1.9 in)	8 years	45 of 100 (Notable)
21 August 1978	Cherokee, US	daily rain	65.3 mm (2.6 in)	32.0 mm (1.3 in)	56 years	45 of 100 (Notable)
21 August 1978	Rock 1 E, US	daily rain	73.7 mm (2.9 in)	21.9 mm (0.9 in)	59 years	44 of 100 (Notable)
21 August 1978	Manley Hot Springs, US	daily rain	29.0 mm (1.1 in)	19.1 mm (0.8 in)	41 years	43 of 100 (Notable)
21 August 1978	Borinquen AP, PR	daily rain	67.6 mm (2.7 in)	44.7 mm (1.8 in)	20 years	42 of 100 (Notable)
21 August 1978	Sovetskaja Gavan, RU	daily rain	28.0 mm (1.1 in)	14.0 mm (0.6 in)	64 years	37 of 100 (Notable)
21 August 1978	Nevelsk, RU	daily rain	52.3 mm (2.1 in)	28.4 mm (1.1 in)	25 years	35 of 100 (Notable)
21 August 1978	Trona, US	monthly low min	10.0 C (50.0 F)	1.1 C (2.0 F)	57 years	35 of 100 (Notable)
21 August 1978	Alexandria, US	daily rain	36.8 mm (1.4 in)	12.4 mm (0.5 in)	60 years	35 of 100 (Notable)
21 August 1978	Marre-Sale, RU	monthly low max	-0.4 C (31.3 F)	0.4 C (0.7 F)	61 years	34 of 100 (Routine)
21 August 1978	Sangary, RU	daily rain	25.4 mm (1.0 in)	14.9 mm (0.6 in)	24 years	34 of 100 (Routine)
21 August 1978	Biser, RU	daily low min	-1.2 C (29.8 F)	0.2 C (0.4 F)	86 years	34 of 100 (Routine)
21 August 1978	Laguna Beach, US	monthly low min	4.4 C (39.9 F)	1.2 C (2.2 F)	49 years	33 of 100 (Routine)
21 August 1978	Escarcega (Smn), MX	daily rain	53.8 mm (2.1 in)	28.4 mm (1.1 in)	24 years	32 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

1800 to 1978

Records set or tied on this calendar date in each year from 1800 to 1978. 1978 had 445 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 1978-08-21: 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 2026-10-13 (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 10	304
10 to 20	20
20 to 30	11
30 to 40	4
40 to 50	2
50 to 60	2
60 to 70	0
70 to 80	1