Weather Records on 21 August 2003

1,241 weather records were set or tied worldwide on 21 August 2003. Highest significance: Vacaville, US.

Key Facts for 21 August 2003

On 21 August 2003, 1,241 weather records were set or tied at long-record stations worldwide.
822 were record highs and 155 were record lows, counting maximum and minimum temperature.
By timescale, 6 were all-time records, 33 monthly and 1,202 daily.
Vacaville set a monthly record daily precipitation of 29.2 mm (1.1 in) on 21 August 2003.
Across 165 earlier years (1800 to 2026) the same calendar date averaged 445 records.

Record Map

1,241 stations

1,241 station records on 21 August 2003 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 August 2003: highest significance records shown on the map
Station	Country	Type	Value	Significance
Vacaville	United States	Record daily precipitation	29.2 mm (1.1 in)	86 of 100 (Exceptional)
Moroleon	Mexico	Record daily precipitation	62.5 mm (2.5 in)	50 of 100 (Notable)
Bay Minette	United States	Record daily precipitation	88.9 mm (3.5 in)	48 of 100 (Notable)
Adin Rs	United States	Record high minimum temperature	15.6 C (60.1 F)	48 of 100 (Notable)
Manitowoc	United States	Record high minimum temperature	25.0 C (77.0 F)	47 of 100 (Notable)
Atmore	United States	Record daily precipitation	68.1 mm (2.7 in)	46 of 100 (Notable)
Davis 2 WSW Exp Farm	United States	Record high minimum temperature	17.2 C (63.0 F)	46 of 100 (Notable)
Barrow AP	United States	Record daily snowfall	7.1 cm (2.8 in)	46 of 100 (Notable)
Huntington Lake	United States	Record high minimum temperature	18.3 C (64.9 F)	45 of 100 (Notable)
Montague 4 NW	United States	Record high minimum temperature	23.9 C (75.0 F)	45 of 100 (Notable)
Jemez Springs	United States	Record high maximum temperature	35.6 C (96.1 F)	45 of 100 (Notable)
Vacaville	United States	Record high minimum temperature	20.0 C (68.0 F)	44 of 100 (Notable)
Detour Village	United States	Record high minimum temperature	21.7 C (71.1 F)	44 of 100 (Notable)
Yates Ctr	United States	Record high minimum temperature	23.9 C (75.0 F)	43 of 100 (Notable)
Tarandacuao	Mexico	Record daily precipitation	47.0 mm (1.9 in)	42 of 100 (Notable)
Babaevo	Russia	Record daily precipitation	31.9 mm (1.3 in)	42 of 100 (Notable)
Rocky Ford 2 SE	United States	Record high maximum temperature	38.3 C (100.9 F)	42 of 100 (Notable)
Mountainair	United States	Record high maximum temperature	36.7 C (98.1 F)	42 of 100 (Notable)
Ruhnu	Latvia	Record daily precipitation	37.2 mm (1.5 in)	41 of 100 (Notable)
Sviland	Norway	Record daily precipitation	57.4 mm (2.3 in)	41 of 100 (Notable)
Cheyenne Wells 2NE	United States	Record high maximum temperature	38.3 C (100.9 F)	41 of 100 (Notable)
Waterdale	United States	Record high minimum temperature	16.1 C (61.0 F)	41 of 100 (Notable)
Abilene	United States	Record high maximum temperature	41.7 C (107.1 F)	41 of 100 (Notable)
Charlevoix	United States	Record high maximum temperature	32.2 C (90.0 F)	41 of 100 (Notable)
Beaver City	United States	Record high maximum temperature	41.1 C (106.0 F)	41 of 100 (Notable)
Turlock #2	United States	Record low maximum temperature	26.7 C (80.1 F)	40 of 100 (Notable)
Fruita	United States	Record high maximum temperature	37.8 C (100.0 F)	40 of 100 (Notable)
Mio Hydro Plt	United States	Record high minimum temperature	21.1 C (70.0 F)	40 of 100 (Notable)
Clayton Muni Air Pk	United States	Record high maximum temperature	36.1 C (97.0 F)	40 of 100 (Notable)
Montello 2NE	United States	Record high minimum temperature	19.4 C (66.9 F)	39 of 100 (Notable)
Kewaunee	United States	Record high minimum temperature	20.6 C (69.1 F)	39 of 100 (Notable)
Presa Colorines (Cfe)	Mexico	Record low minimum temperature	11.1 C (52.0 F)	38 of 100 (Notable)
Holton	United States	Record high maximum temperature	41.7 C (107.1 F)	38 of 100 (Notable)
Ewa Plantation 741	United States	Record high minimum temperature	24.4 C (75.9 F)	38 of 100 (Notable)
Centerville	United States	Record high minimum temperature	25.0 C (77.0 F)	37 of 100 (Notable)
Clover Valley	United States	Record high minimum temperature	15.0 C (59.0 F)	37 of 100 (Notable)
Lahontan Dam	United States	Record high minimum temperature	22.8 C (73.0 F)	37 of 100 (Notable)
Paradise Valley 1 NW	United States	Record high minimum temperature	20.0 C (68.0 F)	37 of 100 (Notable)
Mohonk Lake	United States	Record high maximum temperature	31.7 C (89.1 F)	37 of 100 (Notable)
Helena 1 SSE	United States	Record high minimum temperature	24.4 C (75.9 F)	37 of 100 (Notable)
Lakeview 2 NNW	United States	Record high maximum temperature	37.8 C (100.0 F)	37 of 100 (Notable)
Appleton	United States	Record high minimum temperature	22.8 C (73.0 F)	37 of 100 (Notable)
Apaseo El Alto	Mexico	Record daily precipitation	63.0 mm (2.5 in)	36 of 100 (Notable)
Ona Husoy	Norway	Record daily precipitation	43.0 mm (1.7 in)	36 of 100 (Notable)
Mitchell 5E	United States	Record high minimum temperature	17.2 C (63.0 F)	36 of 100 (Notable)
Lauker	Sweden	Record daily precipitation	30.0 mm (1.2 in)	35 of 100 (Notable)
Buenavista	Mexico	Record high minimum temperature	21.1 C (70.0 F)	34 of 100 (Routine)
Guerrero (Smn)	Mexico	Record high maximum temperature	33.3 C (91.9 F)	34 of 100 (Routine)
Zoquitlan	Mexico	Record daily precipitation	69.9 mm (2.8 in)	34 of 100 (Routine)
San Dieguito	Mexico	Record daily precipitation	95.0 mm (3.7 in)	34 of 100 (Routine)
Saint Bernard	United States	Record daily precipitation	30.5 mm (1.2 in)	34 of 100 (Routine)
Hayfield Pumping Plt	United States	Record daily precipitation	68.6 mm (2.7 in)	34 of 100 (Routine)
Wamego 4 W	United States	Record high maximum temperature	41.1 C (106.0 F)	34 of 100 (Routine)
Yerington	United States	Record high minimum temperature	19.4 C (66.9 F)	34 of 100 (Routine)
Boise City 2 E	United States	Record high maximum temperature	37.8 C (100.0 F)	34 of 100 (Routine)
Green Rvr	United States	Record high maximum temperature	35.6 C (96.1 F)	34 of 100 (Routine)
Mtn Home 1 NNW	United States	Record high minimum temperature	23.3 C (73.9 F)	33 of 100 (Routine)
Howe	United States	Record high maximum temperature	35.6 C (96.1 F)	33 of 100 (Routine)
Conception	United States	Record high maximum temperature	37.8 C (100.0 F)	33 of 100 (Routine)
Battle Mountain 4SE	United States	Record high minimum temperature	20.6 C (69.1 F)	33 of 100 (Routine)

Counts by Type and Timescale

1,241 records

Records set or tied on 21 August 2003 by type: Highest daily maximum 332, Lowest daily maximum 100, Highest daily minimum 490, Lowest daily minimum 55, Heaviest daily rainfall 262, Heaviest daily snowfall 1, Deepest snow cover 1.

Records on 21 August 2003 by type
Record type	Records
Highest daily maximum	332
Lowest daily maximum	100
Highest daily minimum	490
Lowest daily minimum	55
Heaviest daily rainfall	262
Heaviest daily snowfall	1
Deepest snow cover	1

Records on 21 August 2003 by timescale: all-time 6, monthly 33, daily 1,202.

How Much Records Were Beaten By

878 broken records

Margins by which the 878 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 53.1. Ties are not counted.

Top 20 by Significance

21 August 2003

Top 20 records on 21 August 2003 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 August 2003	Vacaville, US	monthly rain	29.2 mm (1.1 in)	19.3 mm (0.8 in)	87 years	86 of 100 (Exceptional)
21 August 2003	Moroleon, MX	daily rain	62.5 mm (2.5 in)	39.9 mm (1.6 in)	26 years	50 of 100 (Notable)
21 August 2003	Bay Minette, US	daily rain	88.9 mm (3.5 in)	25.4 mm (1.0 in)	76 years	48 of 100 (Notable)
21 August 2003	Adin Rs, US	daily high min	15.6 C (60.1 F)	2.8 C (5.0 F)	105 years	48 of 100 (Notable)
21 August 2003	Manitowoc, US	daily high min	25.0 C (77.0 F)	2.8 C (5.0 F)	96 years	47 of 100 (Notable)
21 August 2003	Atmore, US	daily rain	68.1 mm (2.7 in)	39.9 mm (1.6 in)	54 years	46 of 100 (Notable)
21 August 2003	Davis 2 WSW Exp Farm, US	daily high min	17.2 C (63.0 F)	1.6 C (2.9 F)	106 years	46 of 100 (Notable)
21 August 2003	Barrow AP, US	monthly snowfall	7.1 cm (2.8 in)	0.7 cm (0.3 in)	66 years	46 of 100 (Notable)
21 August 2003	Huntington Lake, US	daily high min	18.3 C (64.9 F)	5.0 C (9.0 F)	65 years	45 of 100 (Notable)
21 August 2003	Montague 4 NW, US	daily high min	23.9 C (75.0 F)	2.8 C (5.0 F)	96 years	45 of 100 (Notable)
21 August 2003	Jemez Springs, US	daily high max	35.6 C (96.1 F)	3.4 C (6.1 F)	84 years	45 of 100 (Notable)
21 August 2003	Vacaville, US	daily high min	20.0 C (68.0 F)	1.7 C (3.1 F)	93 years	44 of 100 (Notable)
21 August 2003	Detour Village, US	daily high min	21.7 C (71.1 F)	1.7 C (3.1 F)	96 years	44 of 100 (Notable)
21 August 2003	Yates Ctr, US	daily high min	23.9 C (75.0 F)	1.1 C (2.0 F)	106 years	43 of 100 (Notable)
21 August 2003	Tarandacuao, MX	daily rain	47.0 mm (1.9 in)	21.6 mm (0.9 in)	48 years	42 of 100 (Notable)
21 August 2003	Babaevo, RU	daily rain	31.9 mm (1.3 in)	20.7 mm (0.8 in)	33 years	42 of 100 (Notable)
21 August 2003	Rocky Ford 2 SE, US	daily high max	38.3 C (100.9 F)	1.1 C (2.0 F)	97 years	42 of 100 (Notable)
21 August 2003	Mountainair, US	daily high max	36.7 C (98.1 F)	1.7 C (3.1 F)	92 years	42 of 100 (Notable)
21 August 2003	Ruhnu, LV	daily rain	37.2 mm (1.5 in)	23.1 mm (0.9 in)	8 years	41 of 100 (Notable)
21 August 2003	Sviland, NO	daily rain	57.4 mm (2.3 in)	8.7 mm (0.34 in)	76 years	41 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 2003

Records set or tied on this calendar date in each year from 1800 to 2003. 2003 had 1,241 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 2003-08-21: 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 2026-10-13 (13 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 10	823
10 to 20	31
20 to 30	15
30 to 40	7
40 to 50	1
50 to 60	1