Weather Records on 21 August 1987

740 weather records were set or tied worldwide on 21 August 1987. Highest significance: Moora, AU.

Key Facts for 21 August 1987

On 21 August 1987, 740 weather records were set or tied at long-record stations worldwide.
368 were record highs and 135 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 20 monthly and 718 daily.
Moora set a daily record precipitation of 43.6 mm (1.7 in) on 21 August 1987.
Across 165 earlier years (1800 to 2026) the same calendar date averaged 448 records.

Record Map

740 stations

740 station records on 21 August 1987 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 August 1987: highest significance records shown on the map
Station	Country	Type	Value	Significance
Moora	Australia	Record daily precipitation	43.6 mm (1.7 in)	70 of 100 (Major)
Geneseo	United States	Record daily precipitation	100.1 mm (3.9 in)	69 of 100 (Major)
Jaroma	Australia	Record daily precipitation	30.6 mm (1.2 in)	55 of 100 (Notable)
Youndegin	Australia	Record daily precipitation	31.2 mm (1.2 in)	53 of 100 (Notable)
Goomalling	Australia	Record daily precipitation	25.8 mm (1.0 in)	51 of 100 (Notable)
Northam	Australia	Record daily precipitation	27.2 mm (1.1 in)	51 of 100 (Notable)
Tammin	Australia	Record daily precipitation	29.4 mm (1.2 in)	51 of 100 (Notable)
Wannamal	Australia	Record daily precipitation	36.4 mm (1.4 in)	47 of 100 (Notable)
Moline Quad City Intl AP	United States	Record daily precipitation	90.2 mm (3.6 in)	47 of 100 (Notable)
Tipton	United States	Record daily precipitation	86.6 mm (3.4 in)	45 of 100 (Notable)
Galva	United States	Record daily precipitation	61.2 mm (2.4 in)	43 of 100 (Notable)
Aleksandrovsk-Sahalinskij	Russia	Record low minimum temperature	5.6 C (42.1 F)	42 of 100 (Notable)
Le Claire L&D 14	United States	Record daily precipitation	88.9 mm (3.5 in)	42 of 100 (Notable)
Timovskoe	Russia	Record low minimum temperature	2.8 C (37.0 F)	41 of 100 (Notable)
Anqing	China	Record daily precipitation	123.3 mm (4.9 in)	40 of 100 (Notable)
Calingiri	Australia	Record daily precipitation	25.0 mm (1.0 in)	39 of 100 (Notable)
Irapuato	Mexico	Record low minimum temperature	11.1 C (52.0 F)	39 of 100 (Notable)
Apizaco	Mexico	Record daily precipitation	38.9 mm (1.5 in)	39 of 100 (Notable)
Martuk	Kazakhstan	Record daily precipitation	25.8 mm (1.0 in)	38 of 100 (Notable)
Voznesensk	Ukraine	Record daily precipitation	49.9 mm (2.0 in)	38 of 100 (Notable)
Leroy 5 WSW	United States	Record high maximum temperature	37.8 C (100.0 F)	38 of 100 (Notable)
Unionville	United States	Record daily precipitation	40.1 mm (1.6 in)	38 of 100 (Notable)
Golconda	United States	Record high minimum temperature	21.1 C (70.0 F)	38 of 100 (Notable)
Yathroo	Australia	Record daily precipitation	31.0 mm (1.2 in)	36 of 100 (Notable)
Rossvatn - Heggmo	Norway	Record daily precipitation	45.6 mm (1.8 in)	36 of 100 (Notable)
Crescent City	United States	Record high maximum temperature	37.8 C (100.0 F)	36 of 100 (Notable)
Kenton	United States	Record high minimum temperature	22.8 C (73.0 F)	36 of 100 (Notable)
New London	United States	Record low minimum temperature	5.6 C (42.1 F)	36 of 100 (Notable)
Toliman (Smn)	Mexico	Record low minimum temperature	15.0 C (59.0 F)	35 of 100 (Notable)
Tiskilwa 2 SE	United States	Record daily precipitation	52.6 mm (2.1 in)	35 of 100 (Notable)
Clinton #1	United States	Record daily precipitation	74.4 mm (2.9 in)	35 of 100 (Notable)
Elkhart	United States	Record high maximum temperature	40.0 C (104.0 F)	35 of 100 (Notable)
Clayton Muni Air Pk	United States	Record high minimum temperature	20.0 C (68.0 F)	35 of 100 (Notable)
Sahuaripa	Mexico	Record daily precipitation	63.0 mm (2.5 in)	34 of 100 (Routine)
Dunderlandsdalen	Norway	Record daily precipitation	36.7 mm (1.4 in)	34 of 100 (Routine)
Del Norte 3ENE	United States	Record high minimum temperature	13.3 C (55.9 F)	34 of 100 (Routine)
Princeville	United States	Record daily precipitation	44.2 mm (1.7 in)	34 of 100 (Routine)
Ashland	United States	Record low minimum temperature	7.2 C (45.0 F)	34 of 100 (Routine)
Lemmon	United States	Record high minimum temperature	20.0 C (68.0 F)	34 of 100 (Routine)
Urbenville Old Post Office	Australia	Record daily precipitation	28.8 mm (1.1 in)	33 of 100 (Routine)
Nueva Esperanza	Mexico	Record high minimum temperature	25.6 C (78.1 F)	33 of 100 (Routine)
Taganrog (Lighthouse)	Russia	Record low minimum temperature	11.4 C (52.5 F)	33 of 100 (Routine)
Santa Rosa	United States	Record low maximum temperature	20.6 C (69.1 F)	33 of 100 (Routine)
Sheffield	United Kingdom	Record high minimum temperature	17.7 C (63.9 F)	32 of 100 (Routine)
Buxton	United Kingdom	Record high minimum temperature	16.7 C (62.1 F)	32 of 100 (Routine)
Leoti	United States	Record high maximum temperature	38.9 C (102.0 F)	32 of 100 (Routine)
Lower Chittering	Australia	Record daily precipitation	39.8 mm (1.6 in)	31 of 100 (Routine)
Sodankyla AWS	Finland	Record low minimum temperature	-2.8 C (27.0 F)	31 of 100 (Routine)
Deols Chateauroux Aerodrome de	France	Record high maximum temperature	35.2 C (95.4 F)	31 of 100 (Routine)
Nizhneudinsk	Russia	Record daily precipitation	60.0 mm (2.4 in)	31 of 100 (Routine)
Pearce Raaf	Australia	Record daily precipitation	25.2 mm (1.0 in)	30 of 100 (Routine)
Mogumber Farm	Australia	Record daily precipitation	25.0 mm (1.0 in)	30 of 100 (Routine)
Doodenanning	Australia	Record daily precipitation	31.0 mm (1.2 in)	30 of 100 (Routine)
Le Bourget	France	Record high maximum temperature	33.0 C (91.4 F)	30 of 100 (Routine)
Bombay/Santacruz	India	Record daily precipitation	120.9 mm (4.8 in)	30 of 100 (Routine)
Kisinev	Moldova	Record daily precipitation	33.5 mm (1.3 in)	30 of 100 (Routine)
Drevja	Norway	Record daily precipitation	38.9 mm (1.5 in)	30 of 100 (Routine)
Albacete Los Llanos	Spain	Record high minimum temperature	20.0 C (68.0 F)	30 of 100 (Routine)
Glen St Mary 1 W	United States	Record low minimum temperature	15.6 C (60.1 F)	30 of 100 (Routine)
Dewitt	United States	Record daily precipitation	59.2 mm (2.3 in)	30 of 100 (Routine)

Counts by Type and Timescale

740 records

Records set or tied on 21 August 1987 by type: Highest daily maximum 167, Lowest daily maximum 45, Highest daily minimum 201, Lowest daily minimum 90, Heaviest daily rainfall 237.

Records on 21 August 1987 by type
Record type	Records
Highest daily maximum	167
Lowest daily maximum	45
Highest daily minimum	201
Lowest daily minimum	90
Heaviest daily rainfall	237
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 21 August 1987 by timescale: all-time 2, monthly 20, daily 718.

How Much Records Were Beaten By

554 broken records

Margins by which the 554 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 83.3. Ties are not counted.

Top 20 by Significance

21 August 1987

Top 20 records on 21 August 1987 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 August 1987	Moora, AU	daily rain	43.6 mm (1.7 in)	23.3 mm (0.9 in)	70 years	70 of 100 (Major)
21 August 1987	Geneseo, US	daily rain	100.1 mm (3.9 in)	64.5 mm (2.5 in)	82 years	69 of 100 (Major)
21 August 1987	Jaroma, AU	daily rain	30.6 mm (1.2 in)	21.5 mm (0.8 in)	32 years	55 of 100 (Notable)
21 August 1987	Youndegin, AU	daily rain	31.2 mm (1.2 in)	20.0 mm (0.8 in)	32 years	53 of 100 (Notable)
21 August 1987	Goomalling, AU	daily rain	25.8 mm (1.0 in)	10.3 mm (0.4 in)	70 years	51 of 100 (Notable)
21 August 1987	Northam, AU	daily rain	27.2 mm (1.1 in)	10.7 mm (0.4 in)	70 years	51 of 100 (Notable)
21 August 1987	Tammin, AU	daily rain	29.4 mm (1.2 in)	20.3 mm (0.8 in)	14 years	51 of 100 (Notable)
21 August 1987	Wannamal, AU	daily rain	36.4 mm (1.4 in)	12.8 mm (0.5 in)	70 years	47 of 100 (Notable)
21 August 1987	Moline Quad City Intl AP, US	daily rain	90.2 mm (3.6 in)	80.0 mm (3.1 in)	12 years	47 of 100 (Notable)
21 August 1987	Tipton, US	daily rain	86.6 mm (3.4 in)	58.2 mm (2.3 in)	6 years	45 of 100 (Notable)
21 August 1987	Galva, US	daily rain	61.2 mm (2.4 in)	15.7 mm (0.6 in)	82 years	43 of 100 (Notable)
21 August 1987	Aleksandrovsk-Sahalinskij, RU	daily low min	5.6 C (42.1 F)	1.2 C (2.2 F)	99 years	42 of 100 (Notable)
21 August 1987	Le Claire L&D 14, US	daily rain	88.9 mm (3.5 in)	42.2 mm (1.7 in)	22 years	42 of 100 (Notable)
21 August 1987	Timovskoe, RU	daily low min	2.8 C (37.0 F)	0.8 C (1.4 F)	99 years	41 of 100 (Notable)
21 August 1987	Anqing, CN	daily rain	123.3 mm (4.9 in)	55.8 mm (2.2 in)	34 years	40 of 100 (Notable)
21 August 1987	Calingiri, AU	daily rain	25.0 mm (1.0 in)	18.4 mm (0.7 in)	14 years	39 of 100 (Notable)
21 August 1987	Irapuato, MX	daily low min	11.1 C (52.0 F)	1.7 C (3.1 F)	64 years	39 of 100 (Notable)
21 August 1987	Apizaco, MX	daily rain	38.9 mm (1.5 in)	19.1 mm (0.8 in)	34 years	39 of 100 (Notable)
21 August 1987	Martuk, KZ	daily rain	25.8 mm (1.0 in)	14.6 mm (0.6 in)	9 years	38 of 100 (Notable)
21 August 1987	Voznesensk, UA	daily rain	49.9 mm (2.0 in)	21.5 mm (0.8 in)	36 years	38 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 1987

Records set or tied on this calendar date in each year from 1800 to 1987. 1987 had 740 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 1987-08-21: 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 2026-10-14 (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 20	532
20 to 40	15
40 to 60	4
60 to 80	1
80 to 100	2