Weather Records on 21 August 1975

545 weather records were set or tied worldwide on 21 August 1975. Highest significance: Cape Bruny Lighthouse, AU.

Key Facts for 21 August 1975

On 21 August 1975, 545 weather records were set or tied at long-record stations worldwide.
111 were record highs and 146 were record lows, counting maximum and minimum temperature.
By timescale, 3 were all-time records, 19 monthly and 523 daily.
Cape Bruny Lighthouse set a daily record precipitation of 32.0 mm (1.3 in) on 21 August 1975.
Across 165 earlier years (1800 to 2026) the same calendar date averaged 449 records.

Record Map

545 stations

545 station records on 21 August 1975 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 August 1975: highest significance records shown on the map
Station	Country	Type	Value	Significance
Cape Bruny Lighthouse	Australia	Record daily precipitation	32.0 mm (1.3 in)	64 of 100 (Major)
Saint Johns	United States	Record daily precipitation	117.6 mm (4.6 in)	63 of 100 (Major)
Hobart (Ellerslie Road)	Australia	Record daily precipitation	28.0 mm (1.1 in)	60 of 100 (Major)
Lunawanna	Australia	Record daily precipitation	70.4 mm (2.8 in)	60 of 100 (Major)
Nubeena	Australia	Record daily precipitation	49.0 mm (1.9 in)	60 of 100 (Major)
Levendale	Australia	Record daily precipitation	38.6 mm (1.5 in)	56 of 100 (Notable)
Kerkwerve	Netherlands	Record daily precipitation	33.0 mm (1.3 in)	56 of 100 (Notable)
Saginaw Mbs Intl AP	United States	Record daily precipitation	84.3 mm (3.3 in)	53 of 100 (Notable)
Hobart Botanical Gardens	Australia	Record daily precipitation	32.4 mm (1.3 in)	52 of 100 (Notable)
Bellerive (Fort Street)	Australia	Record daily precipitation	35.2 mm (1.4 in)	51 of 100 (Notable)
Gladwin	United States	Record daily precipitation	60.5 mm (2.4 in)	51 of 100 (Notable)
Killora (Grasmere)	Australia	Record daily precipitation	32.0 mm (1.3 in)	49 of 100 (Notable)
Richmond (Brookbank)	Australia	Record daily precipitation	32.0 mm (1.3 in)	49 of 100 (Notable)
Sells	United States	Record daily precipitation	41.9 mm (1.6 in)	49 of 100 (Notable)
Opossum Bay	Australia	Record daily precipitation	33.4 mm (1.3 in)	48 of 100 (Notable)
Risdon	Australia	Record daily precipitation	31.0 mm (1.2 in)	48 of 100 (Notable)
Kaiserslautern	Germany	Record daily precipitation	40.0 mm (1.6 in)	48 of 100 (Notable)
Greenville 2 NNE	United States	Record daily precipitation	81.3 mm (3.2 in)	46 of 100 (Notable)
Tamga-In-Kirgiz	Kyrgyzstan	Record daily precipitation	47.6 mm (1.9 in)	45 of 100 (Notable)
Millington 3 SE	United States	Record daily precipitation	74.4 mm (2.9 in)	45 of 100 (Notable)
Hobart (Waterworks Reserve)	Australia	Record daily precipitation	29.0 mm (1.1 in)	44 of 100 (Notable)
Middleton Post Office	Australia	Record daily precipitation	30.2 mm (1.2 in)	43 of 100 (Notable)
Podor	Senegal	Record low minimum temperature	21.3 C (70.3 F)	43 of 100 (Notable)
Chilton	United States	Record daily precipitation	53.3 mm (2.1 in)	43 of 100 (Notable)
Currie Post Office	Australia	Record daily precipitation	36.2 mm (1.4 in)	40 of 100 (Notable)
Yambacoona	Australia	Record daily precipitation	26.4 mm (1.0 in)	40 of 100 (Notable)
Trier	Germany	Record daily precipitation	63.7 mm (2.5 in)	40 of 100 (Notable)
Trier-Zewen	Germany	Record daily precipitation	63.7 mm (2.5 in)	40 of 100 (Notable)
Hesperia 4 WNW	United States	Record daily precipitation	64.3 mm (2.5 in)	40 of 100 (Notable)
Yemassee 1 N	United States	Record high minimum temperature	26.1 C (79.0 F)	40 of 100 (Notable)
Gangarebo	Sweden	Record daily precipitation	42.5 mm (1.7 in)	39 of 100 (Notable)
Maseskar	Sweden	Record daily precipitation	30.8 mm (1.2 in)	39 of 100 (Notable)
Buckland (Brockley)	Australia	Record daily precipitation	40.0 mm (1.6 in)	38 of 100 (Notable)
Lenah Valley (Augusta Road)	Australia	Record daily precipitation	26.0 mm (1.0 in)	38 of 100 (Notable)
Rokeby (the Mall)	Australia	Record daily precipitation	36.2 mm (1.4 in)	38 of 100 (Notable)
Edmonton City Centre A	Canada	Record daily precipitation	29.2 mm (1.1 in)	38 of 100 (Notable)
Babbitt 2 SE	United States	Record daily precipitation	55.9 mm (2.2 in)	38 of 100 (Notable)
Sioux Falls	United States	Record daily precipitation	53.8 mm (2.1 in)	38 of 100 (Notable)
Tower Hill	Australia	Record daily precipitation	36.4 mm (1.4 in)	37 of 100 (Notable)
Blue River North	Canada	Record daily precipitation	35.6 mm (1.4 in)	37 of 100 (Notable)
Kingston	Australia	Record daily precipitation	33.0 mm (1.3 in)	36 of 100 (Notable)
Mineirolandia	Brazil	Record daily precipitation	45.3 mm (1.8 in)	36 of 100 (Notable)
Albion	United States	Record daily precipitation	62.7 mm (2.5 in)	36 of 100 (Notable)
Bezeck	Russia	Record daily precipitation	26.7 mm (1.1 in)	35 of 100 (Notable)
Baldwin	United States	Record daily precipitation	50.8 mm (2.0 in)	35 of 100 (Notable)
Mt Clemens Ang Base	United States	Record daily precipitation	45.0 mm (1.8 in)	35 of 100 (Notable)
Snug Primary School	Australia	Record daily precipitation	32.8 mm (1.3 in)	34 of 100 (Routine)
Elgin Water	United States	Record daily precipitation	46.2 mm (1.8 in)	34 of 100 (Routine)
Cape Nelson Lighthouse Compari	Australia	Record daily precipitation	25.8 mm (1.0 in)	33 of 100 (Routine)
Kettering (Saddle Road)	Australia	Record daily precipitation	27.2 mm (1.1 in)	33 of 100 (Routine)
Ash Mtn	United States	Record daily precipitation	30.7 mm (1.2 in)	33 of 100 (Routine)
Oceanside Marina	United States	Record low minimum temperature	10.0 C (50.0 F)	33 of 100 (Routine)
Glenview NAS	United States	Record daily precipitation	56.1 mm (2.2 in)	33 of 100 (Routine)
Bainbridge	United States	Record daily precipitation	43.4 mm (1.7 in)	32 of 100 (Routine)
San Fidel 2 E	United States	Record low maximum temperature	20.6 C (69.1 F)	32 of 100 (Routine)
Little Swanport (Lisdillon)	Australia	Record daily precipitation	37.2 mm (1.5 in)	31 of 100 (Routine)
Ormley	Australia	Record daily precipitation	37.4 mm (1.5 in)	31 of 100 (Routine)
Stonehenge	Australia	Record daily precipitation	31.0 mm (1.2 in)	31 of 100 (Routine)
Tarko-Sale	Russia	Record daily precipitation	25.2 mm (1.0 in)	31 of 100 (Routine)
Saint Charles	United States	Record daily precipitation	79.2 mm (3.1 in)	31 of 100 (Routine)

Counts by Type and Timescale

545 records

Records set or tied on 21 August 1975 by type: Highest daily maximum 34, Lowest daily maximum 66, Highest daily minimum 77, Lowest daily minimum 80, Heaviest daily rainfall 288.

Records on 21 August 1975 by type
Record type	Records
Highest daily maximum	34
Lowest daily maximum	66
Highest daily minimum	77
Lowest daily minimum	80
Heaviest daily rainfall	288
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 21 August 1975 by timescale: all-time 3, monthly 19, daily 523.

How Much Records Were Beaten By

444 broken records

Margins by which the 444 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 59.5. Ties are not counted.

Top 20 by Significance

21 August 1975

Top 20 records on 21 August 1975 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 August 1975	Cape Bruny Lighthouse, AU	daily rain	32.0 mm (1.3 in)	16.8 mm (0.7 in)	65 years	64 of 100 (Major)
21 August 1975	Saint Johns, US	all-time rain	117.6 mm (4.6 in)	18.5 mm (0.7 in)	70 years	63 of 100 (Major)
21 August 1975	Hobart (Ellerslie Road), AU	daily rain	28.0 mm (1.1 in)	17.1 mm (0.7 in)	64 years	60 of 100 (Major)
21 August 1975	Lunawanna, AU	daily rain	70.4 mm (2.8 in)	59.5 mm (2.3 in)	48 years	60 of 100 (Major)
21 August 1975	Nubeena, AU	daily rain	49.0 mm (1.9 in)	29.9 mm (1.2 in)	48 years	60 of 100 (Major)
21 August 1975	Levendale, AU	daily rain	38.6 mm (1.5 in)	30.0 mm (1.2 in)	36 years	56 of 100 (Notable)
21 August 1975	Kerkwerve, NL	daily rain	33.0 mm (1.3 in)	14.0 mm (0.6 in)	85 years	56 of 100 (Notable)
21 August 1975	Saginaw Mbs Intl AP, US	daily rain	84.3 mm (3.3 in)	34.0 mm (1.3 in)	60 years	53 of 100 (Notable)
21 August 1975	Hobart Botanical Gardens, AU	daily rain	32.4 mm (1.3 in)	21.2 mm (0.8 in)	12 years	52 of 100 (Notable)
21 August 1975	Bellerive (Fort Street), AU	daily rain	35.2 mm (1.4 in)	24.3 mm (1.0 in)	12 years	51 of 100 (Notable)
21 August 1975	Gladwin, US	daily rain	60.5 mm (2.4 in)	24.9 mm (1.0 in)	76 years	51 of 100 (Notable)
21 August 1975	Killora (Grasmere), AU	daily rain	32.0 mm (1.3 in)	22.6 mm (0.9 in)	12 years	49 of 100 (Notable)
21 August 1975	Richmond (Brookbank), AU	daily rain	32.0 mm (1.3 in)	20.8 mm (0.8 in)	12 years	49 of 100 (Notable)
21 August 1975	Sells, US	daily rain	41.9 mm (1.6 in)	28.7 mm (1.1 in)	53 years	49 of 100 (Notable)
21 August 1975	Opossum Bay, AU	daily rain	33.4 mm (1.3 in)	19.2 mm (0.8 in)	12 years	48 of 100 (Notable)
21 August 1975	Risdon, AU	daily rain	31.0 mm (1.2 in)	23.9 mm (0.9 in)	12 years	48 of 100 (Notable)
21 August 1975	Kaiserslautern, DE	daily rain	40.0 mm (1.6 in)	15.6 mm (0.6 in)	64 years	48 of 100 (Notable)
21 August 1975	Greenville 2 NNE, US	daily rain	81.3 mm (3.2 in)	29.2 mm (1.1 in)	52 years	46 of 100 (Notable)
21 August 1975	Tamga-In-Kirgiz, KG	all-time rain	47.6 mm (1.9 in)	6.8 mm (0.27 in)	35 years	45 of 100 (Notable)
21 August 1975	Millington 3 SE, US	daily rain	74.4 mm (2.9 in)	23.6 mm (0.9 in)	52 years	45 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 1975

Records set or tied on this calendar date in each year from 1800 to 1975. 1975 had 545 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 1975-08-21: 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	354
10 to 20	59
20 to 30	22
30 to 40	5
40 to 50	3
50 to 60	1