Weather Records on 21 August 2009

1,319 weather records were set or tied worldwide on 21 August 2009. Highest significance: Poona, IN.

Key Facts for 21 August 2009

On 21 August 2009, 1,319 weather records were set or tied at long-record stations worldwide.
913 were record highs and 208 were record lows, counting maximum and minimum temperature.
By timescale, 6 were all-time records, 34 monthly and 1,279 daily.
Poona set a daily record precipitation of 63.0 mm (2.5 in) on 21 August 2009.
Across 165 earlier years (1800 to 2026) the same calendar date averaged 445 records.

Record Map

1,319 stations

1,319 station records on 21 August 2009 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 August 2009: highest significance records shown on the map
Station	Country	Type	Value	Significance
Poona	India	Record daily precipitation	63.0 mm (2.5 in)	73 of 100 (Major)
Dawson	United States	Record daily precipitation	80.8 mm (3.2 in)	61 of 100 (Major)
Sao Paulo (Aeroport	Brazil	Record daily precipitation	215.9 mm (8.5 in)	60 of 100 (Major)
Sovetskaja Gavan	Russia	Record daily precipitation	102.7 mm (4.0 in)	58 of 100 (Notable)
Kosciusko	United States	Record daily precipitation	68.3 mm (2.7 in)	58 of 100 (Notable)
Santa Rosa	Mexico	Record daily precipitation	62.0 mm (2.4 in)	57 of 100 (Notable)
Abbeville	United States	Record daily precipitation	78.0 mm (3.1 in)	57 of 100 (Notable)
Aleksandrov Gaj	Russia	Record daily precipitation	47.1 mm (1.9 in)	56 of 100 (Notable)
Novouzensk	Russia	Record daily precipitation	35.4 mm (1.4 in)	54 of 100 (Notable)
Tuscaloosa Oliver Dam	United States	Record daily precipitation	69.1 mm (2.7 in)	53 of 100 (Notable)
Hyndevad	Sweden	Record daily precipitation	40.2 mm (1.6 in)	50 of 100 (Notable)
Brunswick-McKinnon AP	United States	Record daily precipitation	81.3 mm (3.2 in)	49 of 100 (Notable)
Kailua 446	United States	Record high maximum temperature	30.6 C (87.1 F)	48 of 100 (Notable)
Folkston 3 SW	United States	Record daily precipitation	129.5 mm (5.1 in)	47 of 100 (Notable)
Presa de Guadalupe	Mexico	Record daily precipitation	38.9 mm (1.5 in)	46 of 100 (Notable)
Manston	United Kingdom	Record low minimum temperature	0.0 C (32.0 F)	46 of 100 (Notable)
La Harpe	United States	Record low maximum temperature	21.7 C (71.1 F)	44 of 100 (Notable)
Hanover	United States	Record high minimum temperature	21.1 C (70.0 F)	44 of 100 (Notable)
Hanover	United States	Record daily precipitation	38.6 mm (1.5 in)	44 of 100 (Notable)
El Palmito	Mexico	Record daily precipitation	56.6 mm (2.2 in)	43 of 100 (Notable)
Eskilstuna	Sweden	Record daily precipitation	42.2 mm (1.7 in)	43 of 100 (Notable)
Highland Home	United States	Record low maximum temperature	21.7 C (71.1 F)	43 of 100 (Notable)
State UNIV	United States	Record daily precipitation	68.1 mm (2.7 in)	43 of 100 (Notable)
Moorestown 4 E	United States	Record high minimum temperature	26.1 C (79.0 F)	43 of 100 (Notable)
Luna Rs	United States	Record high maximum temperature	33.9 C (93.0 F)	43 of 100 (Notable)
Pendleton Dwtn	United States	Record high minimum temperature	18.9 C (66.0 F)	43 of 100 (Notable)
Aspendell	United States	Record high minimum temperature	13.9 C (57.0 F)	42 of 100 (Notable)
Bend	United States	Record high maximum temperature	36.7 C (98.1 F)	42 of 100 (Notable)
Cornwall	United States	Record high minimum temperature	23.3 C (73.9 F)	42 of 100 (Notable)
Scottsbluff W B Heilig Fld AP	United States	Record low minimum temperature	6.1 C (43.0 F)	42 of 100 (Notable)
Holmbo_D	Sweden	Record daily precipitation	34.8 mm (1.4 in)	41 of 100 (Notable)
Grand Portage	United States	Record low maximum temperature	15.0 C (59.0 F)	41 of 100 (Notable)
Centreville	United States	Record daily precipitation	57.2 mm (2.3 in)	41 of 100 (Notable)
Steffenville	United States	Record low maximum temperature	22.8 C (73.0 F)	41 of 100 (Notable)
Bozeman Montana State UNIV	United States	Record high maximum temperature	33.3 C (91.9 F)	41 of 100 (Notable)
Trident	United States	Record high minimum temperature	20.0 C (68.0 F)	41 of 100 (Notable)
Paradise Valley 1 NW	United States	Record high maximum temperature	37.2 C (99.0 F)	41 of 100 (Notable)
Edenton	United States	Record high minimum temperature	25.6 C (78.1 F)	41 of 100 (Notable)
Butte Bert Mooney AP	United States	Record high maximum temperature	33.3 C (91.9 F)	41 of 100 (Notable)
Wynyard Airport	Australia	Record daily precipitation	27.0 mm (1.1 in)	40 of 100 (Notable)
Paradise	United States	Record high maximum temperature	34.4 C (93.9 F)	40 of 100 (Notable)
Shubuta	United States	Record daily precipitation	47.0 mm (1.9 in)	40 of 100 (Notable)
Koping	Sweden	Record daily precipitation	36.7 mm (1.4 in)	39 of 100 (Notable)
Kanab	United States	Record high maximum temperature	38.9 C (102.0 F)	39 of 100 (Notable)
Katrineholm_D	Sweden	Record daily precipitation	39.0 mm (1.5 in)	38 of 100 (Notable)
Jackson	United States	Record daily precipitation	61.5 mm (2.4 in)	38 of 100 (Notable)
Yreka	United States	Record high maximum temperature	39.4 C (102.9 F)	38 of 100 (Notable)
Beaumont City	United States	Record high minimum temperature	26.7 C (80.1 F)	38 of 100 (Notable)
Sonnblick	Austria	Record high minimum temperature	6.3 C (43.3 F)	37 of 100 (Notable)
Kamennaja-Step	Russia	Record low maximum temperature	16.2 C (61.2 F)	37 of 100 (Notable)
Waldron	United States	Record low maximum temperature	23.9 C (75.0 F)	37 of 100 (Notable)
Ixcateopan de Cuauhtemoc	Mexico	Record daily precipitation	71.1 mm (2.8 in)	36 of 100 (Notable)
Gonzalez	Mexico	Record low minimum temperature	16.7 C (62.1 F)	36 of 100 (Notable)
Overum	Sweden	Record daily precipitation	39.2 mm (1.5 in)	36 of 100 (Notable)
Valla	Sweden	Record daily precipitation	33.2 mm (1.3 in)	36 of 100 (Notable)
Fredonia	United States	Record high maximum temperature	38.9 C (102.0 F)	36 of 100 (Notable)
Bowman Dam	United States	Record high maximum temperature	32.2 C (90.0 F)	36 of 100 (Notable)
Harrison	United States	Record low minimum temperature	3.3 C (37.9 F)	36 of 100 (Notable)
Banner Elk	United States	Record daily precipitation	47.5 mm (1.9 in)	36 of 100 (Notable)
Ardmore 1 NW	United States	Record low minimum temperature	3.9 C (39.0 F)	36 of 100 (Notable)

Counts by Type and Timescale

1,319 records

Records set or tied on 21 August 2009 by type: Highest daily maximum 406, Lowest daily maximum 97, Highest daily minimum 507, Lowest daily minimum 111, Heaviest daily rainfall 198.

Records on 21 August 2009 by type
Record type	Records
Highest daily maximum	406
Lowest daily maximum	97
Highest daily minimum	507
Lowest daily minimum	111
Heaviest daily rainfall	198
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 21 August 2009 by timescale: all-time 6, monthly 34, daily 1,279.

How Much Records Were Beaten By

917 broken records

Margins by which the 917 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 164.8. Ties are not counted.

Top 20 by Significance

21 August 2009

Top 20 records on 21 August 2009 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 August 2009	Poona, IN	daily rain	63.0 mm (2.5 in)	35.1 mm (1.4 in)	106 years	73 of 100 (Major)
21 August 2009	Dawson, US	daily rain	80.8 mm (3.2 in)	61.0 mm (2.4 in)	39 years	61 of 100 (Major)
21 August 2009	Sao Paulo (Aeroport, BR	monthly rain	215.9 mm (8.5 in)	164.8 mm (6.5 in)	11 years	60 of 100 (Major)
21 August 2009	Sovetskaja Gavan, RU	daily rain	102.7 mm (4.0 in)	74.7 mm (2.9 in)	31 years	58 of 100 (Notable)
21 August 2009	Kosciusko, US	daily rain	68.3 mm (2.7 in)	25.1 mm (1.0 in)	112 years	58 of 100 (Notable)
21 August 2009	Santa Rosa, MX	daily rain	62.0 mm (2.4 in)	41.7 mm (1.6 in)	38 years	57 of 100 (Notable)
21 August 2009	Abbeville, US	daily rain	78.0 mm (3.1 in)	36.1 mm (1.4 in)	108 years	57 of 100 (Notable)
21 August 2009	Aleksandrov Gaj, RU	daily rain	47.1 mm (1.9 in)	34.4 mm (1.4 in)	32 years	56 of 100 (Notable)
21 August 2009	Novouzensk, RU	daily rain	35.4 mm (1.4 in)	21.0 mm (0.8 in)	32 years	54 of 100 (Notable)
21 August 2009	Tuscaloosa Oliver Dam, US	daily rain	69.1 mm (2.7 in)	20.6 mm (0.8 in)	95 years	53 of 100 (Notable)
21 August 2009	Hyndevad, SE	daily rain	40.2 mm (1.6 in)	26.9 mm (1.1 in)	23 years	50 of 100 (Notable)
21 August 2009	Brunswick-McKinnon AP, US	daily rain	81.3 mm (3.2 in)	55.9 mm (2.2 in)	56 years	49 of 100 (Notable)
21 August 2009	Kailua 446, US	daily high max	30.6 C (87.1 F)	2.3 C (4.1 F)	75 years	48 of 100 (Notable)
21 August 2009	Folkston 3 SW, US	daily rain	129.5 mm (5.1 in)	64.7 mm (2.5 in)	35 years	47 of 100 (Notable)
21 August 2009	Presa de Guadalupe, MX	daily rain	38.9 mm (1.5 in)	37.1 mm (1.5 in)	11 years	46 of 100 (Notable)
21 August 2009	Manston, GB	monthly low min	0.0 C (32.0 F)	5.0 C (9.0 F)	28 years	46 of 100 (Notable)
21 August 2009	La Harpe, US	daily low max	21.7 C (71.1 F)	1.6 C (2.9 F)	111 years	44 of 100 (Notable)
21 August 2009	Hanover, US	daily high min	21.1 C (70.0 F)	1.7 C (3.1 F)	108 years	44 of 100 (Notable)
21 August 2009	Hanover, US	daily rain	38.6 mm (1.5 in)	6.6 mm (0.26 in)	95 years	44 of 100 (Notable)
21 August 2009	El Palmito, MX	daily rain	56.6 mm (2.2 in)	16.7 mm (0.7 in)	67 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

1800 to 2009

Records set or tied on this calendar date in each year from 1800 to 2009. 2009 had 1,319 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 2009-08-21: 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 25	897
25 to 50	15
50 to 75	4
75 to 100	0
100 to 125	0
125 to 150	0
150 to 175	1