Weather Records on 12 August 1971

486 weather records were set or tied worldwide on 12 August 1971. Highest significance: Mertzon, US.

Key Facts for 12 August 1971

On 12 August 1971, 486 weather records were set or tied at long-record stations worldwide.
222 were record highs and 124 were record lows, counting maximum and minimum temperature.
By timescale, 3 were all-time records, 12 monthly and 471 daily.
Mertzon set an all-time record daily precipitation of 212.1 mm (8.4 in) on 12 August 1971.
Across 166 earlier years (1793 to 2026) the same calendar date averaged 447 records.

Record Map

486 stations

486 station records on 12 August 1971 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 12 August 1971: highest significance records shown on the map
Station	Country	Type	Value	Significance
Mertzon	United States	Record daily precipitation	212.1 mm (8.4 in)	71 of 100 (Major)
Tobolsk	Russia	Record daily precipitation	42.1 mm (1.7 in)	66 of 100 (Major)
Big Wells 2W	United States	Record daily precipitation	76.7 mm (3.0 in)	50 of 100 (Notable)
Kerrville	United States	Record daily precipitation	141.0 mm (5.6 in)	48 of 100 (Notable)
Booneville	United States	Record daily precipitation	54.9 mm (2.2 in)	44 of 100 (Notable)
Brownwood 2NE	United States	Record daily precipitation	57.4 mm (2.3 in)	42 of 100 (Notable)
Menard	United States	Record low maximum temperature	26.1 C (79.0 F)	42 of 100 (Notable)
Hondo	United States	Record daily precipitation	84.3 mm (3.3 in)	41 of 100 (Notable)
Rucker Canyon	United States	Record daily precipitation	99.1 mm (3.9 in)	39 of 100 (Notable)
Cape Naturaliste	Australia	Record daily precipitation	31.2 mm (1.2 in)	37 of 100 (Notable)
Camacho (Smn)	Mexico	Record daily precipitation	62.0 mm (2.4 in)	37 of 100 (Notable)
Ardmore	United States	Record daily precipitation	62.7 mm (2.5 in)	36 of 100 (Notable)
Amparo	Brazil	Record daily precipitation	37.8 mm (1.5 in)	35 of 100 (Notable)
Barroso	Brazil	Record daily precipitation	33.2 mm (1.3 in)	34 of 100 (Routine)
Bolivar	United States	Record low minimum temperature	2.2 C (36.0 F)	33 of 100 (Routine)
Camden 3 W	United States	Record daily precipitation	65.0 mm (2.6 in)	33 of 100 (Routine)
Boerne	United States	Record daily precipitation	138.4 mm (5.4 in)	33 of 100 (Routine)
Monticello Muni AP	United States	Record daily precipitation	27.4 mm (1.1 in)	33 of 100 (Routine)
Minas Nuevas	Mexico	Record daily precipitation	91.9 mm (3.6 in)	32 of 100 (Routine)
Madison	United States	Record daily precipitation	45.5 mm (1.8 in)	32 of 100 (Routine)
Stockholm	Sweden	Record low maximum temperature	15.2 C (59.4 F)	31 of 100 (Routine)
Tombstone	United States	Record daily precipitation	35.6 mm (1.4 in)	31 of 100 (Routine)
Crescent City 3 NNW	United States	Record high minimum temperature	14.4 C (57.9 F)	31 of 100 (Routine)
Mt Airy 2 W	United States	Record daily precipitation	52.1 mm (2.1 in)	31 of 100 (Routine)
Waynesville 1 E	United States	Record daily precipitation	60.5 mm (2.4 in)	31 of 100 (Routine)
Rotan	United States	Record daily precipitation	38.1 mm (1.5 in)	31 of 100 (Routine)
Seminole	United States	Record daily precipitation	35.1 mm (1.4 in)	31 of 100 (Routine)
San Angelo	United States	Record low maximum temperature	25.0 C (77.0 F)	31 of 100 (Routine)
Woodward	United States	Record daily precipitation	26.7 mm (1.1 in)	30 of 100 (Routine)
Heppner	United States	Record high maximum temperature	38.3 C (100.9 F)	30 of 100 (Routine)
Ballinger 2 NW	United States	Record low maximum temperature	27.8 C (82.0 F)	30 of 100 (Routine)
Fredericksburg	United States	Record daily precipitation	61.7 mm (2.4 in)	30 of 100 (Routine)
Waterdale	United States	Record high minimum temperature	17.8 C (64.0 F)	29 of 100 (Routine)
Carlsbad	United States	Record low maximum temperature	26.7 C (80.1 F)	29 of 100 (Routine)
Colorado City	United States	Record low maximum temperature	26.7 C (80.1 F)	29 of 100 (Routine)
Kamennaja-Step	Russia	Record high maximum temperature	35.4 C (95.7 F)	28 of 100 (Routine)
San Carlos	United States	Record daily precipitation	27.7 mm (1.1 in)	28 of 100 (Routine)
Paonia 1SW	United States	Record low minimum temperature	8.3 C (46.9 F)	28 of 100 (Routine)
Arcade	United States	Record low minimum temperature	3.3 C (37.9 F)	28 of 100 (Routine)
Mocksville 5SE	United States	Record daily precipitation	47.5 mm (1.9 in)	28 of 100 (Routine)
McCamey	United States	Record low maximum temperature	26.1 C (79.0 F)	28 of 100 (Routine)
Velikie Luki	Russia	Record high minimum temperature	15.7 C (60.3 F)	27 of 100 (Routine)
Estes Park	United States	Record high minimum temperature	15.6 C (60.1 F)	27 of 100 (Routine)
Rosalia	United States	Record high maximum temperature	37.2 C (99.0 F)	27 of 100 (Routine)
Usina Pinhal (Eloy Chaves)	Brazil	Record daily precipitation	48.7 mm (1.9 in)	26 of 100 (Routine)
Aquiles Serdan 46	Mexico	Record daily precipitation	41.1 mm (1.6 in)	26 of 100 (Routine)
Grand Marais	United States	Record high maximum temperature	28.9 C (84.0 F)	26 of 100 (Routine)
Nashua 2 NNW	United States	Record daily precipitation	44.7 mm (1.8 in)	26 of 100 (Routine)
Baldonnel	Canada	Record low maximum temperature	11.7 C (53.1 F)	25 of 100 (Routine)
Vilnius	Lithuania	Record high maximum temperature	29.2 C (84.6 F)	25 of 100 (Routine)
Happy Camp Rs	United States	Record high maximum temperature	43.9 C (111.0 F)	25 of 100 (Routine)
Lawton	United States	Record daily precipitation	25.9 mm (1.0 in)	25 of 100 (Routine)
Prineville	United States	Record high maximum temperature	38.3 C (100.9 F)	25 of 100 (Routine)
Eagle Pass 3N	United States	Record low minimum temperature	19.4 C (66.9 F)	25 of 100 (Routine)
Junction 4SSW	United States	Record low maximum temperature	27.2 C (81.0 F)	25 of 100 (Routine)
Gore Bay	Canada	Record low minimum temperature	4.4 C (39.9 F)	24 of 100 (Routine)
Andalusia 3 W	United States	Record low maximum temperature	27.8 C (82.0 F)	24 of 100 (Routine)
Le Grand	United States	Record high minimum temperature	22.2 C (72.0 F)	24 of 100 (Routine)
Newport Beach Harbor	United States	Record high minimum temperature	20.6 C (69.1 F)	24 of 100 (Routine)
Imlay	United States	Record high minimum temperature	22.2 C (72.0 F)	24 of 100 (Routine)

Counts by Type and Timescale

486 records

Records set or tied on 12 August 1971 by type: Highest daily maximum 138, Lowest daily maximum 71, Highest daily minimum 84, Lowest daily minimum 53, Heaviest daily rainfall 140.

Records on 12 August 1971 by type
Record type	Records
Highest daily maximum	138
Lowest daily maximum	71
Highest daily minimum	84
Lowest daily minimum	53
Heaviest daily rainfall	140
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 12 August 1971 by timescale: all-time 3, monthly 12, daily 471.

How Much Records Were Beaten By

372 broken records

Margins by which the 372 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 99.9. Ties are not counted.

Top 20 by Significance

12 August 1971

Top 20 records on 12 August 1971 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
12 August 1971	Mertzon, US	all-time rain	212.1 mm (8.4 in)	90.2 mm (3.6 in)	28 years	71 of 100 (Major)
12 August 1971	Tobolsk, RU	daily rain	42.1 mm (1.7 in)	30.5 mm (1.2 in)	61 years	66 of 100 (Major)
12 August 1971	Big Wells 2W, US	daily rain	76.7 mm (3.0 in)	68.3 mm (2.7 in)	37 years	50 of 100 (Notable)
12 August 1971	Kerrville, US	daily rain	141.0 mm (5.6 in)	99.9 mm (3.9 in)	4 years	48 of 100 (Notable)
12 August 1971	Booneville, US	daily rain	54.9 mm (2.2 in)	30.5 mm (1.2 in)	49 years	44 of 100 (Notable)
12 August 1971	Brownwood 2NE, US	daily rain	57.4 mm (2.3 in)	42.9 mm (1.7 in)	10 years	42 of 100 (Notable)
12 August 1971	Menard, US	daily low max	26.1 C (79.0 F)	5.0 C (9.0 F)	66 years	42 of 100 (Notable)
12 August 1971	Hondo, US	daily rain	84.3 mm (3.3 in)	57.6 mm (2.3 in)	4 years	41 of 100 (Notable)
12 August 1971	Rucker Canyon, US	all-time rain	99.1 mm (3.9 in)	4.1 mm (0.16 in)	27 years	39 of 100 (Notable)
12 August 1971	Cape Naturaliste, AU	daily rain	31.2 mm (1.2 in)	9.1 mm (0.36 in)	57 years	37 of 100 (Notable)
12 August 1971	Camacho (Smn), MX	monthly rain	62.0 mm (2.4 in)	17.0 mm (0.7 in)	5 years	37 of 100 (Notable)
12 August 1971	Ardmore, US	daily rain	62.7 mm (2.5 in)	42.1 mm (1.7 in)	17 years	36 of 100 (Notable)
12 August 1971	Amparo, BR	daily rain	37.8 mm (1.5 in)	29.5 mm (1.2 in)	16 years	35 of 100 (Notable)
12 August 1971	Barroso, BR	daily rain	33.2 mm (1.3 in)	23.0 mm (0.9 in)	24 years	34 of 100 (Routine)
12 August 1971	Bolivar, US	daily low min	2.2 C (36.0 F)	3.9 C (7.0 F)	61 years	33 of 100 (Routine)
12 August 1971	Camden 3 W, US	daily rain	65.0 mm (2.6 in)	25.6 mm (1.0 in)	28 years	33 of 100 (Routine)
12 August 1971	Boerne, US	monthly rain	138.4 mm (5.4 in)	16.7 mm (0.7 in)	24 years	33 of 100 (Routine)
12 August 1971	Monticello Muni AP, US	daily rain	27.4 mm (1.1 in)	2.0 mm (0.08 in)	76 years	33 of 100 (Routine)
12 August 1971	Minas Nuevas, MX	daily rain	91.9 mm (3.6 in)	39.8 mm (1.6 in)	20 years	32 of 100 (Routine)
12 August 1971	Madison, US	daily rain	45.5 mm (1.8 in)	17.6 mm (0.7 in)	36 years	32 of 100 (Routine)

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 1971

Records set or tied on this calendar date in each year from 1793 to 1971. 1971 had 486 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 1971-08-12: 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	351
20 to 40	15
40 to 60	3
60 to 80	1
80 to 100	2