Weather Records on 20 August 2009

1,414 weather records were set or tied worldwide on 20 August 2009. Highest significance: Parsons 2 NW, US.

Key Facts for 20 August 2009

On 20 August 2009, 1,414 weather records were set or tied at long-record stations worldwide.
1,006 were record highs and 179 were record lows, counting maximum and minimum temperature.
By timescale, 8 were all-time records, 44 monthly and 1,362 daily.
Parsons 2 NW set a daily record precipitation of 91.4 mm (3.6 in) on 20 August 2009.
Across 163 earlier years (1797 to 2026) the same calendar date averaged 449 records.

Record Map

1,414 stations

1,414 station records on 20 August 2009 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 August 2009: highest significance records shown on the map
Station	Country	Type	Value	Significance
Parsons 2 NW	United States	Record daily precipitation	91.4 mm (3.6 in)	57 of 100 (Notable)
Bellefontaine	United States	Record daily precipitation	74.2 mm (2.9 in)	57 of 100 (Notable)
New Carlisle	United States	Record daily precipitation	53.3 mm (2.1 in)	57 of 100 (Notable)
Poona	India	Record daily precipitation	74.9 mm (2.9 in)	56 of 100 (Notable)
Columbus	United States	Record daily precipitation	156.5 mm (6.2 in)	56 of 100 (Notable)
Walnut 4S	United States	Record daily precipitation	110.7 mm (4.4 in)	56 of 100 (Notable)
Nenjiang	China	Record daily precipitation	60.5 mm (2.4 in)	55 of 100 (Notable)
Presa la Calera	Mexico	Record low minimum temperature	15.6 C (60.1 F)	51 of 100 (Notable)
Enmuveem	Russia	Record daily precipitation	39.7 mm (1.6 in)	51 of 100 (Notable)
Sallisaw 2 NW	United States	Record daily precipitation	50.3 mm (2.0 in)	50 of 100 (Notable)
Hinckley	United States	Record daily precipitation	120.9 mm (4.8 in)	49 of 100 (Notable)
Monett 4SW	United States	Record daily precipitation	120.1 mm (4.7 in)	49 of 100 (Notable)
Patterson	United States	Record daily precipitation	88.9 mm (3.5 in)	49 of 100 (Notable)
Rosalia	United States	Record high minimum temperature	21.1 C (70.0 F)	48 of 100 (Notable)
Nemours (Ghazaouet)	Algeria	Record high minimum temperature	25.7 C (78.3 F)	47 of 100 (Notable)
Milstead	United States	Record daily precipitation	63.5 mm (2.5 in)	47 of 100 (Notable)
San Isidro	Mexico	Record daily precipitation	55.1 mm (2.2 in)	46 of 100 (Notable)
Aldergrove	United Kingdom	Record daily precipitation	48.3 mm (1.9 in)	46 of 100 (Notable)
Cambridge	United States	Record daily precipitation	88.9 mm (3.5 in)	46 of 100 (Notable)
Cassville 1 NE	United States	Record daily precipitation	88.9 mm (3.5 in)	46 of 100 (Notable)
Galena	United States	Record daily precipitation	73.9 mm (2.9 in)	46 of 100 (Notable)
Kantunilkin	Mexico	Record daily precipitation	130.8 mm (5.1 in)	45 of 100 (Notable)
Carthage	United States	Record daily precipitation	130.8 mm (5.1 in)	45 of 100 (Notable)
Beardstown	United States	Record daily precipitation	39.6 mm (1.6 in)	44 of 100 (Notable)
Mimbres 4NNW	United States	Record high maximum temperature	34.4 C (93.9 F)	44 of 100 (Notable)
Springfield Wtp	United States	Record daily precipitation	58.2 mm (2.3 in)	44 of 100 (Notable)
Atlantic City Marina	United States	Record high minimum temperature	25.0 C (77.0 F)	44 of 100 (Notable)
Mtn Home 1 NNW	United States	Record daily precipitation	39.4 mm (1.6 in)	43 of 100 (Notable)
Wapello	United States	Record daily precipitation	72.6 mm (2.9 in)	43 of 100 (Notable)
Fruitland	United States	Record low minimum temperature	6.1 C (43.0 F)	43 of 100 (Notable)
Fall Rvr Lake	United States	Record daily precipitation	36.8 mm (1.4 in)	42 of 100 (Notable)
Waco 4N	United States	Record daily precipitation	115.6 mm (4.6 in)	42 of 100 (Notable)
Nazas	Mexico	Record daily precipitation	42.9 mm (1.7 in)	41 of 100 (Notable)
Col du Grand St-Bernard	Switzerland	Record high minimum temperature	11.4 C (52.5 F)	41 of 100 (Notable)
Diamond 2W	United States	Record daily precipitation	106.7 mm (4.2 in)	41 of 100 (Notable)
Palmyra	United States	Record daily precipitation	47.2 mm (1.9 in)	41 of 100 (Notable)
Durham	United States	Record high minimum temperature	21.1 C (70.0 F)	41 of 100 (Notable)
Ashland	United States	Record high maximum temperature	39.4 C (102.9 F)	41 of 100 (Notable)
Aberdeen	United States	Record high maximum temperature	34.4 C (93.9 F)	41 of 100 (Notable)
Chitradurga	India	Record daily precipitation	42.9 mm (1.7 in)	40 of 100 (Notable)
Eindhoven	Netherlands	Record high maximum temperature	36.6 C (97.9 F)	40 of 100 (Notable)
Salem	United States	Record daily precipitation	60.2 mm (2.4 in)	40 of 100 (Notable)
Versailles	United States	Record daily precipitation	45.2 mm (1.8 in)	40 of 100 (Notable)
Ainsworth	United States	Record low maximum temperature	20.6 C (69.1 F)	40 of 100 (Notable)
Renison Bell	Australia	Record daily precipitation	34.4 mm (1.4 in)	39 of 100 (Notable)
Le Bourget	France	Record high maximum temperature	34.4 C (93.9 F)	39 of 100 (Notable)
Potlatch 3 NNE	United States	Record high minimum temperature	17.2 C (63.0 F)	39 of 100 (Notable)
Havana	United States	Record daily precipitation	55.9 mm (2.2 in)	39 of 100 (Notable)
Greenfield	United States	Record daily precipitation	47.8 mm (1.9 in)	39 of 100 (Notable)
Waukon 3NNE	United States	Record daily precipitation	79.8 mm (3.1 in)	39 of 100 (Notable)
Cloquet	United States	Record daily precipitation	60.7 mm (2.4 in)	39 of 100 (Notable)
Ozark Beach 2 NNE	United States	Record daily precipitation	58.4 mm (2.3 in)	39 of 100 (Notable)
Atotonilco El Alto	Mexico	Record high minimum temperature	18.3 C (64.9 F)	38 of 100 (Notable)
Eelde	Netherlands	Record high maximum temperature	34.8 C (94.6 F)	38 of 100 (Notable)
Arhangelsk	Russia	Record low maximum temperature	10.3 C (50.5 F)	38 of 100 (Notable)
Plymouth-Kingston	United States	Record high minimum temperature	23.3 C (73.9 F)	38 of 100 (Notable)
Caplinger Mills	United States	Record daily precipitation	81.3 mm (3.2 in)	38 of 100 (Notable)
Honolulu Intl AP	United States	Record low minimum temperature	18.9 C (66.0 F)	38 of 100 (Notable)
La Tinaja	Mexico	Record daily precipitation	63.8 mm (2.5 in)	37 of 100 (Notable)
Jerecuaro	Mexico	Record high minimum temperature	16.7 C (62.1 F)	37 of 100 (Notable)

Counts by Type and Timescale

1,414 records

Records set or tied on 20 August 2009 by type: Highest daily maximum 583, Lowest daily maximum 58, Highest daily minimum 423, Lowest daily minimum 121, Heaviest daily rainfall 229.

Records on 20 August 2009 by type
Record type	Records
Highest daily maximum	583
Lowest daily maximum	58
Highest daily minimum	423
Lowest daily minimum	121
Heaviest daily rainfall	229
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 20 August 2009 by timescale: all-time 8, monthly 44, daily 1,362.

How Much Records Were Beaten By

1,054 broken records

Margins by which the 1,054 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 93.5. Ties are not counted.

Top 20 by Significance

20 August 2009

Top 20 records on 20 August 2009 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 August 2009	Parsons 2 NW, US	daily rain	91.4 mm (3.6 in)	42.4 mm (1.7 in)	76 years	57 of 100 (Notable)
20 August 2009	Bellefontaine, US	daily rain	74.2 mm (2.9 in)	46.5 mm (1.8 in)	38 years	57 of 100 (Notable)
20 August 2009	New Carlisle, US	daily rain	53.3 mm (2.1 in)	28.9 mm (1.1 in)	88 years	57 of 100 (Notable)
20 August 2009	Poona, IN	daily rain	74.9 mm (2.9 in)	54.3 mm (2.1 in)	20 years	56 of 100 (Notable)
20 August 2009	Columbus, US	daily rain	156.5 mm (6.2 in)	93.5 mm (3.7 in)	20 years	56 of 100 (Notable)
20 August 2009	Walnut 4S, US	daily rain	110.7 mm (4.4 in)	69.8 mm (2.7 in)	20 years	56 of 100 (Notable)
20 August 2009	Nenjiang, CN	daily rain	60.5 mm (2.4 in)	39.8 mm (1.6 in)	51 years	55 of 100 (Notable)
20 August 2009	Presa la Calera, MX	daily low min	15.6 C (60.1 F)	4.4 C (7.9 F)	30 years	51 of 100 (Notable)
20 August 2009	Enmuveem, RU	all-time rain	39.7 mm (1.6 in)	5.7 mm (0.22 in)	45 years	51 of 100 (Notable)
20 August 2009	Sallisaw 2 NW, US	daily rain	50.3 mm (2.0 in)	24.4 mm (1.0 in)	90 years	50 of 100 (Notable)
20 August 2009	Hinckley, US	monthly rain	120.9 mm (4.8 in)	12.9 mm (0.5 in)	69 years	49 of 100 (Notable)
20 August 2009	Monett 4SW, US	monthly rain	120.1 mm (4.7 in)	51.3 mm (2.0 in)	0 years	49 of 100 (Notable)
20 August 2009	Patterson, US	daily rain	88.9 mm (3.5 in)	47.8 mm (1.9 in)	43 years	49 of 100 (Notable)
20 August 2009	Rosalia, US	daily high min	21.1 C (70.0 F)	3.3 C (5.9 F)	99 years	48 of 100 (Notable)
20 August 2009	Nemours (Ghazaouet), DZ	daily high min	25.7 C (78.3 F)	1.7 C (3.1 F)	108 years	47 of 100 (Notable)
20 August 2009	Milstead, US	daily rain	63.5 mm (2.5 in)	34.0 mm (1.3 in)	60 years	47 of 100 (Notable)
20 August 2009	San Isidro, MX	daily rain	55.1 mm (2.2 in)	34.3 mm (1.4 in)	42 years	46 of 100 (Notable)
20 August 2009	Aldergrove, GB	daily rain	48.3 mm (1.9 in)	29.2 mm (1.1 in)	12 years	46 of 100 (Notable)
20 August 2009	Cambridge, US	daily rain	88.9 mm (3.5 in)	38.1 mm (1.5 in)	34 years	46 of 100 (Notable)
20 August 2009	Cassville 1 NE, US	daily rain	88.9 mm (3.5 in)	38.6 mm (1.5 in)	48 years	46 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

1797 to 2009

Records set or tied on this calendar date in each year from 1797 to 2009. 2009 had 1,414 records.

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

Records on 08-20 in each year
Year	Records
1797	1
1807	1
1809	2
1816	1
1830	1
1832	1
1838	1
1840	1
1842	1
1846	1
1849	1
1850	1
1852	1
1858	3
1863	5
1867	4
1870	3
1871	1
1873	1
1875	2
1877	1
1883	2
1884	2
1885	6
1886	1
1888	1
1889	2
1890	2
1891	2
1892	6
1893	1
1894	1
1895	1
1896	5
1897	6
1898	1
1899	5
1900	7
1901	12
1902	3
1903	7
1904	30
1905	7
1906	26
1907	15
1908	21
1909	69
1910	7
1911	18
1912	25
1913	23
1914	15
1915	14
1916	74
1917	51
1918	69
1919	25
1920	47
1921	23
1922	52
1923	83
1924	132
1925	193
1926	187
1927	338
1928	101
1929	213
1930	318
1931	214
1932	299
1933	324
1934	376
1935	339
1936	543
1937	537
1938	250
1939	448
1940	695
1941	230
1942	429
1943	436
1944	355
1945	398
1946	349
1947	988
1948	403
1949	431
1950	1,341
1951	824
1952	425
1953	441
1954	476
1955	848
1956	678
1957	342
1958	281
1959	764
1960	465
1961	520
1962	684
1963	577
1964	629
1965	470
1966	1,094
1967	657
1968	862
1969	608
1970	414
1971	585
1972	522
1973	490
1974	565
1975	411
1976	894
1977	860
1978	563
1979	1,009
1980	991
1981	856
1982	620
1983	1,465
1984	696
1985	666
1986	819
1987	564
1988	991
1989	603
1990	1,262
1991	804
1992	1,168
1993	759
1994	719
1995	1,113
1996	900
1997	1,214
1998	802
1999	810
2000	989
2001	909
2002	1,208
2003	1,031
2004	1,333
2005	1,112
2006	851
2007	1,955
2008	1,170
2009	1,414
2010	1,028
2011	987
2012	1,086
2013	545
2014	582
2015	1,075
2016	872
2017	324
2018	657
2019	698
2020	1,051
2021	1,028
2022	1,038
2023	1,479
2024	589
2025	1,134
2026	985

Download the Data

Data for records on 2009-08-20: 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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-16. Last revised 16 October 2026 (2026-10-16).

Margin	Records
0 to 20	1,005
20 to 40	37
40 to 60	10
60 to 80	1
80 to 100	1