Weather Records on 18 August 1971

381 weather records were set or tied worldwide on 18 August 1971. Highest significance: Willard 4 SW, US.

Key Facts for 18 August 1971

On 18 August 1971, 381 weather records were set or tied at long-record stations worldwide.
98 were record highs and 138 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 8 monthly and 372 daily.
Willard 4 SW set a daily record precipitation of 90.2 mm (3.6 in) on 18 August 1971.
Across 171 earlier years (1797 to 2026) the same calendar date averaged 441 records.

Record Map

381 stations

381 station records on 18 August 1971 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 August 1971: highest significance records shown on the map
Station	Country	Type	Value	Significance
Willard 4 SW	United States	Record daily precipitation	90.2 mm (3.6 in)	62 of 100 (Major)
Cloquet	United States	Record daily precipitation	94.5 mm (3.7 in)	60 of 100 (Major)
New Bern 3 NW	United States	Record daily precipitation	94.0 mm (3.7 in)	49 of 100 (Notable)
Oxford	United Kingdom	Record daily precipitation	25.7 mm (1.0 in)	48 of 100 (Notable)
Ft Robinson	United States	Record daily precipitation	33.8 mm (1.3 in)	48 of 100 (Notable)
Kon-Kolodez	Russia	Record daily precipitation	45.3 mm (1.8 in)	47 of 100 (Notable)
Majkop	Russia	Record daily precipitation	42.6 mm (1.7 in)	46 of 100 (Notable)
Brule Rs	United States	Record daily precipitation	65.0 mm (2.6 in)	45 of 100 (Notable)
Watertown Rgnl AP	United States	Record daily precipitation	49.0 mm (1.9 in)	45 of 100 (Notable)
Krakmo	Norway	Record daily precipitation	27.4 mm (1.1 in)	42 of 100 (Notable)
Chara	Russia	Record daily precipitation	31.8 mm (1.3 in)	39 of 100 (Notable)
Winnsboro	United States	Record low maximum temperature	21.1 C (70.0 F)	39 of 100 (Notable)
Solon Springs	United States	Record daily precipitation	55.9 mm (2.2 in)	39 of 100 (Notable)
Superior	United States	Record daily precipitation	41.4 mm (1.6 in)	39 of 100 (Notable)
Chapel Hill 2 W	United States	Record low maximum temperature	22.8 C (73.0 F)	38 of 100 (Notable)
Grindstone Island	Canada	Record low minimum temperature	8.9 C (48.0 F)	36 of 100 (Notable)
Moncure 3 SE	United States	Record daily precipitation	53.8 mm (2.1 in)	36 of 100 (Notable)
Saluda	United States	Record low maximum temperature	21.7 C (71.1 F)	36 of 100 (Notable)
Blackdown	South Africa	Record daily precipitation	36.5 mm (1.4 in)	35 of 100 (Notable)
Durham	United States	Record low maximum temperature	23.3 C (73.9 F)	35 of 100 (Notable)
Greenville	United States	Record low maximum temperature	23.9 C (75.0 F)	35 of 100 (Notable)
Falls River	Canada	Record daily precipitation	60.7 mm (2.4 in)	34 of 100 (Routine)
Siler City 2 N	United States	Record low maximum temperature	21.1 C (70.0 F)	34 of 100 (Routine)
Winter	United States	Record daily precipitation	64.0 mm (2.5 in)	34 of 100 (Routine)
Sonnblick	Austria	Record high maximum temperature	10.3 C (50.5 F)	33 of 100 (Routine)
Lac Vieux Desert	United States	Record daily precipitation	37.3 mm (1.5 in)	33 of 100 (Routine)
Bezenchuk	Russia	Record high minimum temperature	24.2 C (75.6 F)	32 of 100 (Routine)
Poronajsk	Russia	Record low minimum temperature	4.0 C (39.2 F)	32 of 100 (Routine)
Geneva	United States	Record low maximum temperature	28.9 C (84.0 F)	32 of 100 (Routine)
Port Alice	Canada	Record daily precipitation	33.8 mm (1.3 in)	31 of 100 (Routine)
Las Vigas	Mexico	Record low maximum temperature	10.6 C (51.1 F)	31 of 100 (Routine)
Lexington	United States	Record low maximum temperature	23.9 C (75.0 F)	31 of 100 (Routine)
Louisburg	United States	Record low maximum temperature	23.3 C (73.9 F)	31 of 100 (Routine)
Silverton	United States	Record daily precipitation	40.6 mm (1.6 in)	31 of 100 (Routine)
Bones I Bardu	Norway	Record daily precipitation	25.5 mm (1.0 in)	30 of 100 (Routine)
Ft Collins	United States	Record high minimum temperature	17.2 C (63.0 F)	30 of 100 (Routine)
Waynesboro 2 S	United States	Record low maximum temperature	23.3 C (73.9 F)	30 of 100 (Routine)
Chapel Hill 2 W	United States	Record daily precipitation	46.2 mm (1.8 in)	30 of 100 (Routine)
Concord	United States	Record low maximum temperature	22.2 C (72.0 F)	30 of 100 (Routine)
Monroe 2 SE	United States	Record low maximum temperature	25.6 C (78.1 F)	30 of 100 (Routine)
Eagle Pass 3N	United States	Record low maximum temperature	31.7 C (89.1 F)	30 of 100 (Routine)
Hickory	United States	Record low maximum temperature	21.1 C (70.0 F)	29 of 100 (Routine)
Moncure 3 SE	United States	Record low maximum temperature	22.2 C (72.0 F)	29 of 100 (Routine)
Birtle	Canada	Record daily precipitation	29.2 mm (1.1 in)	28 of 100 (Routine)
Kinston 7 SE	United States	Record low maximum temperature	23.9 C (75.0 F)	28 of 100 (Routine)
Camden 3 W	United States	Record low maximum temperature	23.3 C (73.9 F)	28 of 100 (Routine)
Escalante	United States	Record high minimum temperature	17.2 C (63.0 F)	28 of 100 (Routine)
Zinapecuaro	Mexico	Record low minimum temperature	7.8 C (46.0 F)	27 of 100 (Routine)
Ponce 4 E	Puerto Rico [United States]	Record low maximum temperature	29.4 C (84.9 F)	27 of 100 (Routine)
Culpanovo	Russia	Record high minimum temperature	22.4 C (72.3 F)	27 of 100 (Routine)
Fellsmere 7 SSW	United States	Record high minimum temperature	25.6 C (78.1 F)	27 of 100 (Routine)
Henderson 2 NNW	United States	Record low maximum temperature	23.3 C (73.9 F)	27 of 100 (Routine)
High Pt	United States	Record low maximum temperature	22.8 C (73.0 F)	27 of 100 (Routine)
Greenwood	United States	Record low maximum temperature	22.8 C (73.0 F)	27 of 100 (Routine)
La Delle 7 NE	United States	Record daily precipitation	29.2 mm (1.1 in)	27 of 100 (Routine)
Sonora	United States	Record low minimum temperature	15.6 C (60.1 F)	27 of 100 (Routine)
Castle Dale	United States	Record high minimum temperature	17.2 C (63.0 F)	27 of 100 (Routine)
Goldsboro 4 SE	United States	Record low maximum temperature	23.3 C (73.9 F)	27 of 100 (Routine)
Jaransk	Russia	Record daily precipitation	27.5 mm (1.1 in)	26 of 100 (Routine)
Prescott	United States	Record daily precipitation	38.4 mm (1.5 in)	26 of 100 (Routine)

Counts by Type and Timescale

381 records

Records set or tied on 18 August 1971 by type: Highest daily maximum 35, Lowest daily maximum 83, Highest daily minimum 63, Lowest daily minimum 55, Heaviest daily rainfall 145.

Records on 18 August 1971 by type
Record type	Records
Highest daily maximum	35
Lowest daily maximum	83
Highest daily minimum	63
Lowest daily minimum	55
Heaviest daily rainfall	145
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 18 August 1971 by timescale: all-time 1, monthly 8, daily 372.

How Much Records Were Beaten By

288 broken records

Margins by which the 288 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 63.0. Ties are not counted.

Top 20 by Significance

18 August 1971

Top 20 records on 18 August 1971 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 August 1971	Willard 4 SW, US	daily rain	90.2 mm (3.6 in)	56.7 mm (2.2 in)	56 years	62 of 100 (Major)
18 August 1971	Cloquet, US	monthly rain	94.5 mm (3.7 in)	33.5 mm (1.3 in)	45 years	60 of 100 (Major)
18 August 1971	New Bern 3 NW, US	daily rain	94.0 mm (3.7 in)	63.0 mm (2.5 in)	30 years	49 of 100 (Notable)
18 August 1971	Oxford, GB	daily rain	25.7 mm (1.0 in)	5.4 mm (0.21 in)	114 years	48 of 100 (Notable)
18 August 1971	Ft Robinson, US	daily rain	33.8 mm (1.3 in)	18.6 mm (0.7 in)	66 years	48 of 100 (Notable)
18 August 1971	Kon-Kolodez, RU	daily rain	45.3 mm (1.8 in)	20.9 mm (0.8 in)	30 years	47 of 100 (Notable)
18 August 1971	Majkop, RU	daily rain	42.6 mm (1.7 in)	35.2 mm (1.4 in)	25 years	46 of 100 (Notable)
18 August 1971	Brule Rs, US	daily rain	65.0 mm (2.6 in)	57.4 mm (2.3 in)	4 years	45 of 100 (Notable)
18 August 1971	Watertown Rgnl AP, US	daily rain	49.0 mm (1.9 in)	21.6 mm (0.9 in)	66 years	45 of 100 (Notable)
18 August 1971	Krakmo, NO	daily rain	27.4 mm (1.1 in)	9.4 mm (0.37 in)	72 years	42 of 100 (Notable)
18 August 1971	Chara, RU	daily rain	31.8 mm (1.3 in)	18.8 mm (0.7 in)	28 years	39 of 100 (Notable)
18 August 1971	Winnsboro, US	daily low max	21.1 C (70.0 F)	4.5 C (8.1 F)	65 years	39 of 100 (Notable)
18 August 1971	Solon Springs, US	daily rain	55.9 mm (2.2 in)	20.3 mm (0.8 in)	57 years	39 of 100 (Notable)
18 August 1971	Superior, US	daily rain	41.4 mm (1.6 in)	27.9 mm (1.1 in)	36 years	39 of 100 (Notable)
18 August 1971	Chapel Hill 2 W, US	daily low max	22.8 C (73.0 F)	2.8 C (5.0 F)	73 years	38 of 100 (Notable)
18 August 1971	Grindstone Island, CA	daily low min	8.9 C (48.0 F)	1.1 C (2.0 F)	80 years	36 of 100 (Notable)
18 August 1971	Moncure 3 SE, US	daily rain	53.8 mm (2.1 in)	22.0 mm (0.9 in)	56 years	36 of 100 (Notable)
18 August 1971	Saluda, US	daily low max	21.7 C (71.1 F)	3.3 C (5.9 F)	65 years	36 of 100 (Notable)
18 August 1971	Blackdown, ZA	daily rain	36.5 mm (1.4 in)	29.4 mm (1.2 in)	18 years	35 of 100 (Notable)
18 August 1971	Durham, US	daily low max	23.3 C (73.9 F)	4.5 C (8.1 F)	48 years	35 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 1971

Records set or tied on this calendar date in each year from 1797 to 1971. 1971 had 381 records.

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

Records on 08-18 in each year
Year	Records
1797	2
1805	1
1816	1
1827	1
1829	1
1830	1
1833	1
1841	1
1844	1
1845	3
1846	1
1847	1
1849	1
1851	1
1852	1
1853	1
1854	2
1855	1
1856	1
1861	1
1864	2
1866	1
1868	2
1869	1
1870	2
1872	1
1873	1
1875	3
1876	1
1878	1
1879	2
1883	3
1885	3
1886	3
1887	3
1888	2
1889	1
1890	1
1891	2
1892	6
1893	4
1894	4
1895	1
1898	4
1899	6
1900	2
1901	10
1902	8
1903	6
1904	8
1905	10
1906	40
1907	7
1908	21
1909	24
1910	16
1911	11
1912	21
1913	43
1914	37
1915	60
1916	71
1917	70
1918	53
1919	34
1920	51
1921	39
1922	129
1923	90
1924	225
1925	300
1926	168
1927	269
1928	141
1929	181
1930	150
1931	241
1932	382
1933	431
1934	638
1935	424
1936	766
1937	308
1938	243
1939	381
1940	434
1941	467
1942	333
1943	738
1944	325
1945	400
1946	416
1947	958
1948	315
1949	393
1950	683
1951	355
1952	405
1953	323
1954	622
1955	795
1956	580
1957	380
1958	580
1959	537
1960	599
1961	415
1962	428
1963	760
1964	443
1965	525
1966	573
1967	623
1968	795
1969	530
1970	597
1971	381
1972	493
1973	734
1974	639
1975	844
1976	917
1977	1,112
1978	854
1979	1,309
1980	771
1981	1,386
1982	563
1983	1,420
1984	600
1985	765
1986	861
1987	1,609
1988	1,351
1989	952
1990	920
1991	533
1992	1,497
1993	706
1994	1,027
1995	1,882
1996	760
1997	1,191
1998	923
1999	888
2000	1,183
2001	1,036
2002	1,306
2003	860
2004	1,050
2005	865
2006	842
2007	1,116
2008	1,265
2009	839
2010	1,167
2011	1,239
2012	1,247
2013	752
2014	751
2015	880
2016	704
2017	565
2018	462
2019	615
2020	1,541
2021	1,118
2022	1,237
2023	1,094
2024	696
2025	455
2026	545

Download the Data

Data for records on 1971-08-18: 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 10	246
10 to 20	23
20 to 30	11
30 to 40	5
40 to 50	0
50 to 60	2
60 to 70	1