Weather Records on 12 August 2009

814 weather records were set or tied worldwide on 12 August 2009. Highest significance: Cape Barren Island (Cape Barre, AU.

Key Facts for 12 August 2009

On 12 August 2009, 814 weather records were set or tied at long-record stations worldwide.
416 were record highs and 194 were record lows, counting maximum and minimum temperature.
By timescale, 7 were all-time records, 37 monthly and 770 daily.
Cape Barren Island (Cape Barre set a daily record precipitation of 46.0 mm (1.8 in) on 12 August 2009.
Across 166 earlier years (1793 to 2026) the same calendar date averaged 445 records.

Record Map

814 stations

814 station records on 12 August 2009 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 12 August 2009: highest significance records shown on the map
Station	Country	Type	Value	Significance
Cape Barren Island (Cape Barre	Australia	Record daily precipitation	46.0 mm (1.8 in)	80 of 100 (Exceptional)
Nuuanu Rsch 5 775	United States	Record daily precipitation	65.5 mm (2.6 in)	80 of 100 (Exceptional)
Kihei 311	United States	Record daily precipitation	25.9 mm (1.0 in)	76 of 100 (Major)
Napoopoo 28	United States	Record daily precipitation	67.3 mm (2.6 in)	72 of 100 (Major)
Ndjamena	Chad	Record daily precipitation	363.0 mm (14.3 in)	66 of 100 (Major)
Waihee Vly 482	United States	Record daily precipitation	54.6 mm (2.1 in)	62 of 100 (Major)
Pohakea Brg 307.2	United States	Record daily precipitation	32.3 mm (1.3 in)	58 of 100 (Notable)
Kalihi Rsch Site 777	United States	Record daily precipitation	101.9 mm (4.0 in)	56 of 100 (Notable)
Mahinahina 466	United States	Record daily precipitation	54.6 mm (2.1 in)	56 of 100 (Notable)
Kaneohe 838.1	United States	Record daily precipitation	28.2 mm (1.1 in)	53 of 100 (Notable)
Wilhelmina Rise 721	United States	Record daily precipitation	58.2 mm (2.3 in)	53 of 100 (Notable)
Presa la Calera	Mexico	Record low minimum temperature	15.6 C (60.1 F)	51 of 100 (Notable)
Manoa Lyon Arbo 785.2	United States	Record daily precipitation	109.7 mm (4.3 in)	51 of 100 (Notable)
Palolo Vly 718	United States	Record daily precipitation	150.4 mm (5.9 in)	51 of 100 (Notable)
Kainaliu 73.2	United States	Record daily precipitation	103.9 mm (4.1 in)	50 of 100 (Notable)
Pauoa Flats 784	United States	Record daily precipitation	131.1 mm (5.2 in)	50 of 100 (Notable)
Cherry Point MCAS	United States	Record daily precipitation	246.4 mm (9.7 in)	50 of 100 (Notable)
Kaneohe Bay MCAS	United States	Record daily precipitation	40.4 mm (1.6 in)	50 of 100 (Notable)
Jeremiah 1 S	United States	Record daily precipitation	100.1 mm (3.9 in)	49 of 100 (Notable)
Newport	United States	Record low maximum temperature	17.2 C (63.0 F)	49 of 100 (Notable)
Pontotoc Exp STN	United States	Record daily precipitation	111.0 mm (4.4 in)	48 of 100 (Notable)
UNIV of Hawaii 713	United States	Record daily precipitation	48.5 mm (1.9 in)	48 of 100 (Notable)
Cedar Is	United States	Record daily precipitation	110.0 mm (4.3 in)	47 of 100 (Notable)
Pali Golf Course 788.1	United States	Record daily precipitation	72.6 mm (2.9 in)	47 of 100 (Notable)
Nuuanu Rsch 4 783	United States	Record daily precipitation	91.2 mm (3.6 in)	46 of 100 (Notable)
St Marys (Clive Street)	Australia	Record daily precipitation	50.8 mm (2.0 in)	45 of 100 (Notable)
Flinders Island Airport	Australia	Record daily precipitation	32.6 mm (1.3 in)	45 of 100 (Notable)
Yorktown	United States	Record daily precipitation	77.5 mm (3.1 in)	45 of 100 (Notable)
Podor	Senegal	Record daily precipitation	50.0 mm (2.0 in)	44 of 100 (Notable)
Presa de Guadalupe	Mexico	Record low maximum temperature	21.7 C (71.1 F)	42 of 100 (Notable)
Curapca	Russia	Record daily precipitation	36.8 mm (1.4 in)	42 of 100 (Notable)
Mays Landing 1 W	United States	Record daily precipitation	111.0 mm (4.4 in)	42 of 100 (Notable)
Manoa 712.1	United States	Record daily precipitation	37.3 mm (1.5 in)	42 of 100 (Notable)
Waiehu Camp 484	United States	Record daily precipitation	53.3 mm (2.1 in)	42 of 100 (Notable)
Tizi Ouzou	Algeria	Record high maximum temperature	42.5 C (108.5 F)	41 of 100 (Notable)
South Mount Cameron (Gladstone	Australia	Record daily precipitation	38.6 mm (1.5 in)	41 of 100 (Notable)
Prineville	United States	Record high minimum temperature	13.9 C (57.0 F)	41 of 100 (Notable)
Keminmaa Liedakkala	Finland	Record daily precipitation	33.0 mm (1.3 in)	40 of 100 (Notable)
Mercedes 6 SSE	United States	Record high minimum temperature	26.1 C (79.0 F)	40 of 100 (Notable)
St Marys (Cullenswood)	Australia	Record daily precipitation	44.0 mm (1.7 in)	39 of 100 (Notable)
Segen-Kyuel	Russia	Record daily precipitation	30.5 mm (1.2 in)	39 of 100 (Notable)
Lanihau 68.2	United States	Record daily precipitation	53.6 mm (2.1 in)	39 of 100 (Notable)
Serpentine	Australia	Record daily precipitation	25.6 mm (1.0 in)	38 of 100 (Notable)
Culman	Russia	Record daily precipitation	49.2 mm (1.9 in)	38 of 100 (Notable)
Coconut Is 840.1	United States	Record daily precipitation	27.2 mm (1.1 in)	38 of 100 (Notable)
Anderson	United States	Record high minimum temperature	23.9 C (75.0 F)	37 of 100 (Notable)
Waiahole 837	United States	Record daily precipitation	53.3 mm (2.1 in)	37 of 100 (Notable)
Jiulong	China	Record daily precipitation	51.4 mm (2.0 in)	36 of 100 (Notable)
Jabalpur	India	Record daily precipitation	157.0 mm (6.2 in)	36 of 100 (Notable)
Jaskul	Russia	Record daily precipitation	68.5 mm (2.7 in)	36 of 100 (Notable)
Bankhead L&D	United States	Record daily precipitation	116.8 mm (4.6 in)	36 of 100 (Notable)
Summerville 4W	United States	Record high maximum temperature	36.7 C (98.1 F)	35 of 100 (Notable)
Merwin Dam	United States	Record daily precipitation	30.5 mm (1.2 in)	35 of 100 (Notable)
Remscheid	Germany	Record daily precipitation	30.5 mm (1.2 in)	34 of 100 (Routine)
Santa Rosa Mineral	Mexico	Record high minimum temperature	15.0 C (59.0 F)	34 of 100 (Routine)
Trident	United States	Record high minimum temperature	19.4 C (66.9 F)	34 of 100 (Routine)
Kapalama 773	United States	Record daily precipitation	38.1 mm (1.5 in)	34 of 100 (Routine)
Kazalinsk	Kazakhstan	Record low minimum temperature	11.4 C (52.5 F)	33 of 100 (Routine)
Magdalena	Mexico	Record high minimum temperature	20.6 C (69.1 F)	33 of 100 (Routine)
Chietla	Mexico	Record low minimum temperature	10.6 C (51.1 F)	33 of 100 (Routine)

Counts by Type and Timescale

814 records

Records set or tied on 12 August 2009 by type: Highest daily maximum 260, Lowest daily maximum 50, Highest daily minimum 156, Lowest daily minimum 144, Heaviest daily rainfall 204.

Records on 12 August 2009 by type
Record type	Records
Highest daily maximum	260
Lowest daily maximum	50
Highest daily minimum	156
Lowest daily minimum	144
Heaviest daily rainfall	204
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 12 August 2009 by timescale: all-time 7, monthly 37, daily 770.

How Much Records Were Beaten By

578 broken records

Margins by which the 578 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 199.9. Ties are not counted.

Top 20 by Significance

12 August 2009

Top 20 records on 12 August 2009 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
12 August 2009	Cape Barren Island (Cape Barre, AU	daily rain	46.0 mm (1.8 in)	36.9 mm (1.5 in)	102 years	80 of 100 (Exceptional)
12 August 2009	Nuuanu Rsch 5 775, US	daily rain	65.5 mm (2.6 in)	50.8 mm (2.0 in)	100 years	80 of 100 (Exceptional)
12 August 2009	Kihei 311, US	daily rain	25.9 mm (1.0 in)	25.9 mm (1.0 in)	104 years	76 of 100 (Major)
12 August 2009	Napoopoo 28, US	daily rain	67.3 mm (2.6 in)	35.8 mm (1.4 in)	78 years	72 of 100 (Major)
12 August 2009	Ndjamena, TD	all-time rain	363.0 mm (14.3 in)	199.9 mm (7.9 in)	2 years	66 of 100 (Major)
12 August 2009	Waihee Vly 482, US	daily rain	54.6 mm (2.1 in)	46.0 mm (1.8 in)	56 years	62 of 100 (Major)
12 August 2009	Pohakea Brg 307.2, US	daily rain	32.3 mm (1.3 in)	31.3 mm (1.2 in)	44 years	58 of 100 (Notable)
12 August 2009	Kalihi Rsch Site 777, US	daily rain	101.9 mm (4.0 in)	43.5 mm (1.7 in)	72 years	56 of 100 (Notable)
12 August 2009	Mahinahina 466, US	daily rain	54.6 mm (2.1 in)	37.8 mm (1.5 in)	32 years	56 of 100 (Notable)
12 August 2009	Kaneohe 838.1, US	daily rain	28.2 mm (1.1 in)	11.2 mm (0.4 in)	96 years	53 of 100 (Notable)
12 August 2009	Wilhelmina Rise 721, US	daily rain	58.2 mm (2.3 in)	44.5 mm (1.8 in)	24 years	53 of 100 (Notable)
12 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)
12 August 2009	Manoa Lyon Arbo 785.2, US	daily rain	109.7 mm (4.3 in)	67.3 mm (2.6 in)	28 years	51 of 100 (Notable)
12 August 2009	Palolo Vly 718, US	daily rain	150.4 mm (5.9 in)	93.0 mm (3.7 in)	16 years	51 of 100 (Notable)
12 August 2009	Kainaliu 73.2, US	daily rain	103.9 mm (4.1 in)	48.0 mm (1.9 in)	10 years	50 of 100 (Notable)
12 August 2009	Pauoa Flats 784, US	daily rain	131.1 mm (5.2 in)	65.1 mm (2.6 in)	32 years	50 of 100 (Notable)
12 August 2009	Cherry Point MCAS, US	all-time rain	246.4 mm (9.7 in)	15.3 mm (0.6 in)	62 years	50 of 100 (Notable)
12 August 2009	Kaneohe Bay MCAS, US	daily rain	40.4 mm (1.6 in)	29.7 mm (1.2 in)	15 years	50 of 100 (Notable)
12 August 2009	Jeremiah 1 S, US	monthly rain	100.1 mm (3.9 in)	19.6 mm (0.8 in)	63 years	49 of 100 (Notable)
12 August 2009	Newport, US	daily low max	17.2 C (63.0 F)	6.1 C (11.0 F)	91 years	49 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

1793 to 2009

Records set or tied on this calendar date in each year from 1793 to 2009. 2009 had 814 records.

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

Records on 08-12 in each year
Year	Records
1793	1
1796	1
1811	2
1814	1
1815	1
1825	1
1843	1
1851	1
1854	1
1855	2
1856	1
1861	1
1864	3
1865	1
1867	1
1868	1
1871	2
1872	1
1873	1
1874	2
1875	3
1876	2
1879	1
1881	2
1883	1
1884	1
1885	1
1887	2
1888	2
1889	4
1890	4
1891	4
1892	2
1893	1
1894	1
1895	6
1896	2
1897	4
1898	1
1899	10
1900	1
1901	5
1902	9
1903	14
1904	13
1905	16
1906	8
1907	8
1908	31
1909	42
1910	16
1911	33
1912	40
1913	39
1914	26
1915	46
1916	31
1917	134
1918	37
1919	42
1920	26
1921	174
1922	71
1923	89
1924	267
1925	150
1926	154
1927	145
1928	173
1929	276
1930	501
1931	708
1932	418
1933	271
1934	471
1935	408
1936	591
1937	356
1938	237
1939	282
1940	545
1941	481
1942	257
1943	523
1944	595
1945	295
1946	655
1947	729
1948	384
1949	469
1950	442
1951	357
1952	533
1953	227
1954	969
1955	590
1956	265
1957	384
1958	406
1959	388
1960	707
1961	381
1962	466
1963	559
1964	1,346
1965	977
1966	777
1967	1,135
1968	444
1969	629
1970	422
1971	486
1972	473
1973	442
1974	560
1975	593
1976	495
1977	747
1978	571
1979	1,192
1980	692
1981	665
1982	789
1983	923
1984	665
1985	935
1986	615
1987	935
1988	1,518
1989	827
1990	727
1991	726
1992	1,134
1993	936
1994	861
1995	1,654
1996	1,336
1997	1,363
1998	1,215
1999	1,325
2000	741
2001	855
2002	1,345
2003	1,752
2004	1,872
2005	1,085
2006	874
2007	1,209
2008	970
2009	814
2010	1,907
2011	903
2012	910
2013	427
2014	787
2015	757
2016	1,290
2017	533
2018	571
2019	695
2020	730
2021	980
2022	616
2023	779
2024	659
2025	639
2026	849

Download the Data

Data for records on 2009-08-12: 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 25	551
25 to 50	18
50 to 75	6
75 to 100	2
100 to 125	0
125 to 150	0
150 to 175	0
175 to 200	1