Weather Records on 12 August 2021

980 weather records were set or tied worldwide on 12 August 2021. Highest significance: Ann Arbor U of Mich, US.

Key Facts for 12 August 2021

On 12 August 2021, 980 weather records were set or tied at long-record stations worldwide.
788 were record highs and 87 were record lows, counting maximum and minimum temperature.
By timescale, 11 were all-time records, 50 monthly and 919 daily.
Ann Arbor U of Mich set a daily record precipitation of 93.7 mm (3.7 in) on 12 August 2021.
Across 166 earlier years (1793 to 2026) the same calendar date averaged 444 records.

Record Map

980 stations

980 station records on 12 August 2021 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 12 August 2021: highest significance records shown on the map
Station	Country	Type	Value	Significance
Ann Arbor U of Mich	United States	Record daily precipitation	93.7 mm (3.7 in)	80 of 100 (Exceptional)
Charlotte	United States	Record daily precipitation	54.9 mm (2.2 in)	63 of 100 (Major)
Roosevelt 1 S	United States	Record daily precipitation	50.8 mm (2.0 in)	62 of 100 (Major)
Lawrence	United States	Record daily precipitation	127.3 mm (5.0 in)	59 of 100 (Notable)
Kumamoto	Japan	Record daily precipitation	186.9 mm (7.4 in)	58 of 100 (Notable)
Rantoul	United States	Record daily precipitation	129.5 mm (5.1 in)	58 of 100 (Notable)
Hita	Japan	Record daily precipitation	143.0 mm (5.6 in)	57 of 100 (Notable)
Knox Wwtp	United States	Record daily precipitation	81.0 mm (3.2 in)	57 of 100 (Notable)
Saint Johns	United States	Record daily precipitation	70.6 mm (2.8 in)	54 of 100 (Notable)
Bingil Bay	Australia	Record daily precipitation	45.8 mm (1.8 in)	53 of 100 (Notable)
Santo Domingo	Dominican Republic	Record low maximum temperature	26.0 C (78.8 F)	53 of 100 (Notable)
Detroit City AP	United States	Record daily precipitation	39.6 mm (1.6 in)	53 of 100 (Notable)
Grand Ledge 1 NW	United States	Record daily precipitation	84.3 mm (3.3 in)	50 of 100 (Notable)
Salem AP (McNary Field)	United States	Record high minimum temperature	20.6 C (69.1 F)	50 of 100 (Notable)
Tihvin	Russia	Record daily precipitation	49.5 mm (1.9 in)	49 of 100 (Notable)
Greenville	United States	Record daily precipitation	44.5 mm (1.8 in)	48 of 100 (Notable)
Birch Hill Dam	United States	Record high minimum temperature	23.9 C (75.0 F)	48 of 100 (Notable)
Kent City 2 SW	United States	Record daily precipitation	43.9 mm (1.7 in)	48 of 100 (Notable)
Lansing Capital City AP	United States	Record daily precipitation	74.7 mm (2.9 in)	48 of 100 (Notable)
Murotomisaki	Japan	Record daily precipitation	147.1 mm (5.8 in)	47 of 100 (Notable)
Kerch	Ukraine	Record daily precipitation	51.1 mm (2.0 in)	47 of 100 (Notable)
Painesville 4 NW	United States	Record daily precipitation	83.6 mm (3.3 in)	47 of 100 (Notable)
Kochki	Russia	Record daily precipitation	29.7 mm (1.2 in)	46 of 100 (Notable)
Americus	United States	Record daily precipitation	61.0 mm (2.4 in)	46 of 100 (Notable)
Stewart Mtn Dam	United States	Record daily precipitation	49.5 mm (1.9 in)	45 of 100 (Notable)
Jacksonville 2E	United States	Record high minimum temperature	25.0 C (77.0 F)	45 of 100 (Notable)
Allerton	United States	Record high minimum temperature	23.9 C (75.0 F)	45 of 100 (Notable)
Red Lake Falls	United States	Record low minimum temperature	3.3 C (37.9 F)	45 of 100 (Notable)
El-Golea	Algeria	Record high minimum temperature	32.4 C (90.3 F)	44 of 100 (Notable)
Owosso Wwtp	United States	Record daily precipitation	48.8 mm (1.9 in)	44 of 100 (Notable)
Trenton	United States	Record high minimum temperature	25.6 C (78.1 F)	44 of 100 (Notable)
Hillsboro	United States	Record high minimum temperature	23.9 C (75.0 F)	44 of 100 (Notable)
Forks 1 E	United States	Record high maximum temperature	36.1 C (97.0 F)	44 of 100 (Notable)
Fountain Hills	United States	Record daily precipitation	54.6 mm (2.1 in)	43 of 100 (Notable)
Hagerstown 1E	United States	Record high maximum temperature	38.3 C (100.9 F)	43 of 100 (Notable)
Lowell	United States	Record daily precipitation	35.8 mm (1.4 in)	43 of 100 (Notable)
Princeton	United States	Record high minimum temperature	24.4 C (75.9 F)	42 of 100 (Notable)
Elk	United States	Record high minimum temperature	16.1 C (61.0 F)	42 of 100 (Notable)
Bluff	United States	Record high minimum temperature	22.8 C (73.0 F)	42 of 100 (Notable)
Puskinskie_Gory	Russia	Record daily precipitation	49.0 mm (1.9 in)	41 of 100 (Notable)
Clarinda	United States	Record high minimum temperature	23.3 C (73.9 F)	41 of 100 (Notable)
Chelsea	United States	Record daily precipitation	63.8 mm (2.5 in)	41 of 100 (Notable)
Durham	United States	Record high minimum temperature	22.8 C (73.0 F)	41 of 100 (Notable)
Hanover	United States	Record high minimum temperature	21.1 C (70.0 F)	41 of 100 (Notable)
Waverly	United States	Record high minimum temperature	21.7 C (71.1 F)	41 of 100 (Notable)
Skagway	United States	Record high minimum temperature	13.3 C (55.9 F)	41 of 100 (Notable)
Novgorod	Russia	Record daily precipitation	66.0 mm (2.6 in)	40 of 100 (Notable)
Tortosa - Observatorio del Ebr	Spain	Record high maximum temperature	39.9 C (103.8 F)	40 of 100 (Notable)
Nome AP	United States	Record low minimum temperature	-0.5 C (31.1 F)	40 of 100 (Notable)
Pogranichnyj	Russia	Record low maximum temperature	18.5 C (65.3 F)	39 of 100 (Notable)
Roseburg Rgnl AP	United States	Record high minimum temperature	19.4 C (66.9 F)	39 of 100 (Notable)
Oita	Japan	Record daily precipitation	142.0 mm (5.6 in)	38 of 100 (Notable)
Mackay Lost Rvr Rs	United States	Record high minimum temperature	15.6 C (60.1 F)	38 of 100 (Notable)
Sandpoint Exp STN	United States	Record high maximum temperature	36.7 C (98.1 F)	38 of 100 (Notable)
Oolitic Purdue Ex Fm	United States	Record high minimum temperature	24.4 C (75.9 F)	38 of 100 (Notable)
Elkins- Randolph Co AP	United States	Record high maximum temperature	33.3 C (91.9 F)	38 of 100 (Notable)
Parkersburg	United States	Record high minimum temperature	23.9 C (75.0 F)	38 of 100 (Notable)
Douala	Cameroon	Record daily precipitation	185.9 mm (7.3 in)	37 of 100 (Notable)
Cerepovec	Russia	Record daily precipitation	29.0 mm (1.1 in)	37 of 100 (Notable)
Surry Mtn Lake	United States	Record high minimum temperature	22.2 C (72.0 F)	37 of 100 (Notable)

Counts by Type and Timescale

980 records

Records set or tied on 12 August 2021 by type: Highest daily maximum 279, Lowest daily maximum 46, Highest daily minimum 509, Lowest daily minimum 41, Heaviest daily rainfall 105.

Records on 12 August 2021 by type
Record type	Records
Highest daily maximum	279
Lowest daily maximum	46
Highest daily minimum	509
Lowest daily minimum	41
Heaviest daily rainfall	105
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 12 August 2021 by timescale: all-time 11, monthly 50, daily 919.

How Much Records Were Beaten By

735 broken records

Margins by which the 735 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 151.9. Ties are not counted.

Top 20 by Significance

12 August 2021

Top 20 records on 12 August 2021 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
12 August 2021	Ann Arbor U of Mich, US	daily rain	93.7 mm (3.7 in)	46.5 mm (1.8 in)	112 years	80 of 100 (Exceptional)
12 August 2021	Charlotte, US	daily rain	54.9 mm (2.2 in)	28.2 mm (1.1 in)	96 years	63 of 100 (Major)
12 August 2021	Roosevelt 1 S, US	daily rain	50.8 mm (2.0 in)	20.6 mm (0.8 in)	104 years	62 of 100 (Major)
12 August 2021	Lawrence, US	daily rain	127.3 mm (5.0 in)	45.3 mm (1.8 in)	80 years	59 of 100 (Notable)
12 August 2021	Kumamoto, JP	daily rain	186.9 mm (7.4 in)	151.9 mm (6.0 in)	36 years	58 of 100 (Notable)
12 August 2021	Rantoul, US	daily rain	129.5 mm (5.1 in)	81.2 mm (3.2 in)	28 years	58 of 100 (Notable)
12 August 2021	Hita, JP	daily rain	143.0 mm (5.6 in)	100.0 mm (3.9 in)	36 years	57 of 100 (Notable)
12 August 2021	Knox Wwtp, US	daily rain	81.0 mm (3.2 in)	32.7 mm (1.3 in)	112 years	57 of 100 (Notable)
12 August 2021	Saint Johns, US	daily rain	70.6 mm (2.8 in)	61.5 mm (2.4 in)	16 years	54 of 100 (Notable)
12 August 2021	Bingil Bay, AU	daily rain	45.8 mm (1.8 in)	25.5 mm (1.0 in)	83 years	53 of 100 (Notable)
12 August 2021	Santo Domingo, DO	monthly low max	26.0 C (78.8 F)	1.8 C (3.2 F)	70 years	53 of 100 (Notable)
12 August 2021	Detroit City AP, US	daily rain	39.6 mm (1.6 in)	35.8 mm (1.4 in)	58 years	53 of 100 (Notable)
12 August 2021	Grand Ledge 1 NW, US	daily rain	84.3 mm (3.3 in)	52.8 mm (2.1 in)	11 years	50 of 100 (Notable)
12 August 2021	Salem AP (McNary Field), US	monthly high min	20.6 C (69.1 F)	0.6 C (1.1 F)	96 years	50 of 100 (Notable)
12 August 2021	Tihvin, RU	daily rain	49.5 mm (1.9 in)	23.1 mm (0.9 in)	27 years	49 of 100 (Notable)
12 August 2021	Greenville, US	daily rain	44.5 mm (1.8 in)	24.2 mm (1.0 in)	74 years	48 of 100 (Notable)
12 August 2021	Birch Hill Dam, US	all-time high min	23.9 C (75.0 F)	1.1 C (2.0 F)	65 years	48 of 100 (Notable)
12 August 2021	Kent City 2 SW, US	daily rain	43.9 mm (1.7 in)	19.0 mm (0.7 in)	84 years	48 of 100 (Notable)
12 August 2021	Lansing Capital City AP, US	daily rain	74.7 mm (2.9 in)	39.1 mm (1.5 in)	31 years	48 of 100 (Notable)
12 August 2021	Murotomisaki, JP	daily rain	147.1 mm (5.8 in)	86.6 mm (3.4 in)	32 years	47 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 2021

Records set or tied on this calendar date in each year from 1793 to 2021. 2021 had 980 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 2021-08-12: 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 20	697
20 to 40	23
40 to 60	7
60 to 80	3
80 to 100	3
100 to 120	1
120 to 140	0
140 to 160	1