Weather Records on 17 August 2009

922 weather records were set or tied worldwide on 17 August 2009. Highest significance: Tantoyuca, MX.

Key Facts for 17 August 2009

On 17 August 2009, 922 weather records were set or tied at long-record stations worldwide.
500 were record highs and 230 were record lows, counting maximum and minimum temperature.
By timescale, 3 were all-time records, 26 monthly and 893 daily.
Tantoyuca set a daily record precipitation of 117.3 mm (4.6 in) on 17 August 2009.
Across 162 earlier years (1797 to 2026) the same calendar date averaged 471 records.

Record Map

922 stations

922 station records on 17 August 2009 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 August 2009: highest significance records shown on the map
Station	Country	Type	Value	Significance
Tantoyuca	Mexico	Record daily precipitation	117.3 mm (4.6 in)	71 of 100 (Major)
El Obeid	Sudan	Record daily precipitation	180.6 mm (7.1 in)	68 of 100 (Major)
Brookfield	United States	Record daily precipitation	116.3 mm (4.6 in)	65 of 100 (Major)
Biscuit Flat (Woolmit)	Australia	Record daily precipitation	41.2 mm (1.6 in)	59 of 100 (Notable)
Goshen 3SW	United States	Record daily precipitation	96.3 mm (3.8 in)	57 of 100 (Notable)
Westmoreland	United States	Record daily precipitation	75.7 mm (3.0 in)	57 of 100 (Notable)
Hamilton 2W	United States	Record daily precipitation	78.7 mm (3.1 in)	57 of 100 (Notable)
Coimbatore/Peelamed	India	Record daily precipitation	39.9 mm (1.6 in)	55 of 100 (Notable)
Juneau Dwtn	United States	Record daily precipitation	105.7 mm (4.2 in)	55 of 100 (Notable)
Rock Is L&D 15	United States	Record daily precipitation	49.5 mm (1.9 in)	52 of 100 (Notable)
S Bend AP	United States	Record daily precipitation	68.6 mm (2.7 in)	51 of 100 (Notable)
Presa la Calera	Mexico	Record low minimum temperature	15.6 C (60.1 F)	50 of 100 (Notable)
Daytona Beach	United States	Record high minimum temperature	27.2 C (81.0 F)	48 of 100 (Notable)
Polo	United States	Record daily precipitation	87.4 mm (3.4 in)	48 of 100 (Notable)
Columbia City	United States	Record daily precipitation	109.2 mm (4.3 in)	47 of 100 (Notable)
Canton L&D 20	United States	Record daily precipitation	99.8 mm (3.9 in)	47 of 100 (Notable)
Gallatin 1W	United States	Record daily precipitation	66.0 mm (2.6 in)	47 of 100 (Notable)
Bangalore	India	Record daily precipitation	75.9 mm (3.0 in)	46 of 100 (Notable)
Malung	Sweden	Record daily precipitation	35.9 mm (1.4 in)	46 of 100 (Notable)
Highland Home	United States	Record low minimum temperature	15.6 C (60.1 F)	46 of 100 (Notable)
Edwardsville 2 W	United States	Record daily precipitation	43.2 mm (1.7 in)	46 of 100 (Notable)
Sitka AP	United States	Record daily precipitation	71.1 mm (2.8 in)	46 of 100 (Notable)
Annex Creek	United States	Record daily precipitation	79.5 mm (3.1 in)	45 of 100 (Notable)
Ponca City Muni AP	United States	Record daily precipitation	109.2 mm (4.3 in)	45 of 100 (Notable)
Keokuk L&D 19	United States	Record daily precipitation	61.0 mm (2.4 in)	44 of 100 (Notable)
Amity 4 NE	United States	Record daily precipitation	97.5 mm (3.8 in)	44 of 100 (Notable)
Chillicothe 2S	United States	Record daily precipitation	181.9 mm (7.2 in)	44 of 100 (Notable)
Glacier Bay	United States	Record daily precipitation	100.3 mm (3.9 in)	44 of 100 (Notable)
Pattonsburg 2S	United States	Record daily precipitation	63.5 mm (2.5 in)	43 of 100 (Notable)
Versailles	United States	Record daily precipitation	52.1 mm (2.1 in)	43 of 100 (Notable)
Kansas City Intl AP	United States	Record daily precipitation	80.0 mm (3.1 in)	43 of 100 (Notable)
Grace	United States	Record low minimum temperature	-1.1 C (30.0 F)	42 of 100 (Notable)
Plattsburg	United States	Record daily precipitation	138.2 mm (5.4 in)	42 of 100 (Notable)
Anyang	China	Record daily precipitation	133.6 mm (5.3 in)	41 of 100 (Notable)
Chitradurga	India	Record daily precipitation	42.9 mm (1.7 in)	41 of 100 (Notable)
Tuba City	United States	Record low minimum temperature	10.0 C (50.0 F)	41 of 100 (Notable)
Ft Wayne Intl AP	United States	Record daily precipitation	82.3 mm (3.2 in)	41 of 100 (Notable)
Las Perlas	Mexico	Record daily precipitation	159.8 mm (6.3 in)	40 of 100 (Notable)
Titusville	United States	Record high minimum temperature	27.2 C (81.0 F)	40 of 100 (Notable)
Allerton	United States	Record daily precipitation	32.0 mm (1.3 in)	40 of 100 (Notable)
Manila	United States	Record low minimum temperature	1.7 C (35.1 F)	40 of 100 (Notable)
Riverton	United States	Record low maximum temperature	20.6 C (69.1 F)	40 of 100 (Notable)
Shelbina	United States	Record daily precipitation	67.1 mm (2.6 in)	39 of 100 (Notable)
Okeene	United States	Record daily precipitation	48.3 mm (1.9 in)	39 of 100 (Notable)
Cheyenne	United States	Record low minimum temperature	5.0 C (41.0 F)	39 of 100 (Notable)
Ixcateopan de Cuauhtemoc	Mexico	Record low minimum temperature	10.6 C (51.1 F)	38 of 100 (Notable)
Barcelona -Fabra Observatory	Spain	Record high maximum temperature	36.2 C (97.2 F)	37 of 100 (Notable)
Charlevoix	United States	Record high minimum temperature	21.7 C (71.1 F)	37 of 100 (Notable)
Louisiana	United States	Record daily precipitation	51.3 mm (2.0 in)	37 of 100 (Notable)
Haugan 1 W	United States	Record low maximum temperature	15.0 C (59.0 F)	37 of 100 (Notable)
Amarillo	United States	Record daily precipitation	58.4 mm (2.3 in)	37 of 100 (Notable)
Santa Rosalia (Dge)	Mexico	Record high minimum temperature	30.0 C (86.0 F)	36 of 100 (Notable)
Apalachicola AP	United States	Record low maximum temperature	26.1 C (79.0 F)	36 of 100 (Notable)
Donnellson	United States	Record daily precipitation	62.2 mm (2.4 in)	36 of 100 (Notable)
Wakefield 4 W	United States	Record daily precipitation	35.1 mm (1.4 in)	36 of 100 (Notable)
Rockypoint 7NNE	United States	Record low maximum temperature	18.9 C (66.0 F)	36 of 100 (Notable)
Ramos Arizpe (Smn)	Mexico	Record high maximum temperature	36.7 C (98.1 F)	35 of 100 (Notable)
Wrangell AP	United States	Record daily precipitation	35.6 mm (1.4 in)	35 of 100 (Notable)
Suaqui Grande (Smn)	Mexico	Record daily precipitation	37.8 mm (1.5 in)	34 of 100 (Routine)
Kanchanaburi	Thailand	Record daily precipitation	108.7 mm (4.3 in)	34 of 100 (Routine)

Counts by Type and Timescale

922 records

Records set or tied on 17 August 2009 by type: Highest daily maximum 290, Lowest daily maximum 84, Highest daily minimum 210, Lowest daily minimum 146, Heaviest daily rainfall 192.

Records on 17 August 2009 by type
Record type	Records
Highest daily maximum	290
Lowest daily maximum	84
Highest daily minimum	210
Lowest daily minimum	146
Heaviest daily rainfall	192
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 17 August 2009 by timescale: all-time 3, monthly 26, daily 893.

How Much Records Were Beaten By

633 broken records

Margins by which the 633 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 92.9. Ties are not counted.

Top 20 by Significance

17 August 2009

Top 20 records on 17 August 2009 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 August 2009	Tantoyuca, MX	daily rain	117.3 mm (4.6 in)	92.4 mm (3.6 in)	78 years	71 of 100 (Major)
17 August 2009	El Obeid, SD	monthly rain	180.6 mm (7.1 in)	65.6 mm (2.6 in)	45 years	68 of 100 (Major)
17 August 2009	Brookfield, US	daily rain	116.3 mm (4.6 in)	92.9 mm (3.7 in)	64 years	65 of 100 (Major)
17 August 2009	Biscuit Flat (Woolmit), AU	monthly rain	41.2 mm (1.6 in)	4.6 mm (0.18 in)	107 years	59 of 100 (Notable)
17 August 2009	Goshen 3SW, US	daily rain	96.3 mm (3.8 in)	48.5 mm (1.9 in)	44 years	57 of 100 (Notable)
17 August 2009	Westmoreland, US	daily rain	75.7 mm (3.0 in)	57.4 mm (2.3 in)	51 years	57 of 100 (Notable)
17 August 2009	Hamilton 2W, US	daily rain	78.7 mm (3.1 in)	60.4 mm (2.4 in)	43 years	57 of 100 (Notable)
17 August 2009	Coimbatore/Peelamed, IN	daily rain	39.9 mm (1.6 in)	28.7 mm (1.1 in)	40 years	55 of 100 (Notable)
17 August 2009	Juneau Dwtn, US	monthly rain	105.7 mm (4.2 in)	30.0 mm (1.2 in)	43 years	55 of 100 (Notable)
17 August 2009	Rock Is L&D 15, US	daily rain	49.5 mm (1.9 in)	16.5 mm (0.6 in)	136 years	52 of 100 (Notable)
17 August 2009	S Bend AP, US	daily rain	68.6 mm (2.7 in)	41.7 mm (1.6 in)	28 years	51 of 100 (Notable)
17 August 2009	Presa la Calera, MX	daily low min	15.6 C (60.1 F)	5.0 C (9.0 F)	24 years	50 of 100 (Notable)
17 August 2009	Daytona Beach, US	daily high min	27.2 C (81.0 F)	2.2 C (4.0 F)	76 years	48 of 100 (Notable)
17 August 2009	Polo, US	daily rain	87.4 mm (3.4 in)	53.9 mm (2.1 in)	35 years	48 of 100 (Notable)
17 August 2009	Columbia City, US	monthly rain	109.2 mm (4.3 in)	34.5 mm (1.4 in)	7 years	47 of 100 (Notable)
17 August 2009	Canton L&D 20, US	daily rain	99.8 mm (3.9 in)	55.3 mm (2.2 in)	12 years	47 of 100 (Notable)
17 August 2009	Gallatin 1W, US	daily rain	66.0 mm (2.6 in)	28.2 mm (1.1 in)	68 years	47 of 100 (Notable)
17 August 2009	Bangalore, IN	daily rain	75.9 mm (3.0 in)	27.9 mm (1.1 in)	50 years	46 of 100 (Notable)
17 August 2009	Malung, SE	daily rain	35.9 mm (1.4 in)	4.3 mm (0.17 in)	106 years	46 of 100 (Notable)
17 August 2009	Highland Home, US	daily low min	15.6 C (60.1 F)	1.1 C (2.0 F)	102 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 922 records.

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

Records on 08-17 in each year
Year	Records
1797	2
1802	2
1820	2
1837	1
1838	2
1841	2
1842	1
1845	2
1853	1
1854	1
1856	1
1857	1
1861	3
1862	1
1867	1
1868	3
1869	1
1872	1
1875	2
1876	5
1879	1
1881	1
1882	1
1883	2
1885	3
1886	1
1888	5
1891	1
1892	3
1893	2
1894	3
1895	2
1896	3
1897	1
1898	5
1899	8
1900	3
1901	14
1902	7
1903	6
1904	2
1905	11
1906	28
1907	9
1908	26
1909	24
1910	17
1911	18
1912	31
1913	79
1914	41
1915	28
1916	33
1917	35
1918	112
1919	37
1920	110
1921	37
1922	169
1923	161
1924	171
1925	130
1926	182
1927	228
1928	131
1929	243
1930	138
1931	302
1932	360
1933	260
1934	377
1935	437
1936	670
1937	726
1938	466
1939	364
1940	341
1941	378
1942	461
1943	743
1944	531
1945	387
1946	433
1947	682
1948	475
1949	371
1950	522
1951	413
1952	470
1953	345
1954	685
1955	465
1956	407
1957	504
1958	519
1959	543
1960	533
1961	998
1962	445
1963	650
1964	410
1965	641
1966	496
1967	679
1968	953
1969	593
1970	467
1971	447
1972	1,044
1973	750
1974	582
1975	612
1976	797
1977	1,216
1978	814
1979	1,464
1980	895
1981	1,112
1982	554
1983	1,574
1984	726
1985	948
1986	916
1987	1,150
1988	1,608
1989	687
1990	949
1991	560
1992	1,813
1993	803
1994	1,038
1995	1,724
1996	752
1997	1,544
1998	1,003
1999	697
2000	994
2001	1,101
2002	1,266
2003	948
2004	1,046
2005	722
2006	814
2007	1,646
2008	1,301
2009	922
2010	1,105
2011	956
2012	1,215
2013	802
2014	997
2015	890
2016	748
2017	544
2018	518
2019	467
2020	1,529
2021	800
2022	1,428
2023	1,032
2024	740
2025	538
2026	535

Download the Data

Data for records on 2009-08-17: 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	590
20 to 40	28
40 to 60	8
60 to 80	4
80 to 100	3