Weather Records on 18 August 1966

573 weather records were set or tied worldwide on 18 August 1966. Highest significance: Westland, AU.

Key Facts for 18 August 1966

On 18 August 1966, 573 weather records were set or tied at long-record stations worldwide.
101 were record highs and 99 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 17 monthly and 554 daily.
Westland set a daily record precipitation of 32.3 mm (1.3 in) on 18 August 1966.
Across 171 earlier years (1797 to 2026) the same calendar date averaged 440 records.

Record Map

573 stations

573 station records on 18 August 1966 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 August 1966: highest significance records shown on the map
Station	Country	Type	Value	Significance
Westland	Australia	Record daily precipitation	32.3 mm (1.3 in)	64 of 100 (Major)
Malda	India	Record daily precipitation	145.0 mm (5.7 in)	64 of 100 (Major)
West Quarter	Australia	Record daily precipitation	33.5 mm (1.3 in)	56 of 100 (Notable)
Lauda-Konigshofen-Gerlachsheim	Germany	Record daily precipitation	51.2 mm (2.0 in)	53 of 100 (Notable)
Maxwelton Post Office	Australia	Record daily precipitation	33.5 mm (1.3 in)	52 of 100 (Notable)
Premer (Eden Moor)	Australia	Record daily precipitation	45.7 mm (1.8 in)	52 of 100 (Notable)
Mount Morris	Australia	Record daily precipitation	39.4 mm (1.6 in)	51 of 100 (Notable)
Orange 3	Australia	Record daily precipitation	66.0 mm (2.6 in)	51 of 100 (Notable)
Greensburg	United States	Record daily precipitation	76.2 mm (3.0 in)	51 of 100 (Notable)
Tullamore (Old Post Office)	Australia	Record daily precipitation	35.8 mm (1.4 in)	50 of 100 (Notable)
Arrilalah Telegraph Off	Australia	Record daily precipitation	25.7 mm (1.0 in)	49 of 100 (Notable)
Bad-Neunkirchen Mergentheim	Germany	Record daily precipitation	42.0 mm (1.7 in)	49 of 100 (Notable)
Ferrara	Italy	Record daily precipitation	50.0 mm (2.0 in)	48 of 100 (Notable)
Ekaterino-Nikolskoe	Russia	Record daily precipitation	79.9 mm (3.1 in)	48 of 100 (Notable)
Chickballapur	India	Record daily precipitation	142.2 mm (5.6 in)	47 of 100 (Notable)
Ipira (Camisao)	Brazil	Record daily precipitation	28.2 mm (1.1 in)	46 of 100 (Notable)
Malur	India	Record daily precipitation	99.6 mm (3.9 in)	46 of 100 (Notable)
Ottawa	United States	Record daily precipitation	148.6 mm (5.9 in)	45 of 100 (Notable)
Ventry	Australia	Record daily precipitation	32.0 mm (1.3 in)	41 of 100 (Notable)
Chintamani	India	Record daily precipitation	71.1 mm (2.8 in)	41 of 100 (Notable)
Madanapalli	India	Record daily precipitation	93.0 mm (3.7 in)	40 of 100 (Notable)
Surat	Australia	Record daily precipitation	36.6 mm (1.4 in)	39 of 100 (Notable)
Moree (Talmoi)	Australia	Record daily precipitation	30.5 mm (1.2 in)	38 of 100 (Notable)
Boesmansrivier	South Africa	Record daily precipitation	28.0 mm (1.1 in)	38 of 100 (Notable)
Sublette 7WSW	United States	Record daily precipitation	42.9 mm (1.7 in)	38 of 100 (Notable)
Oakwood	Australia	Record daily precipitation	25.4 mm (1.0 in)	36 of 100 (Notable)
Tilpa (Tongo Road)	Australia	Record daily precipitation	29.7 mm (1.2 in)	36 of 100 (Notable)
Strathbogie North	Australia	Record daily precipitation	30.7 mm (1.2 in)	36 of 100 (Notable)
Gowrie Station	Australia	Record daily precipitation	45.5 mm (1.8 in)	35 of 100 (Notable)
Kalingapatam	India	Record daily precipitation	42.3 mm (1.7 in)	35 of 100 (Notable)
Paraiyahat	India	Record daily precipitation	76.2 mm (3.0 in)	35 of 100 (Notable)
Kolar	India	Record daily precipitation	142.2 mm (5.6 in)	35 of 100 (Notable)
Lesbrook	Australia	Record daily precipitation	31.8 mm (1.3 in)	34 of 100 (Routine)
Louth (Bloxham Street)	Australia	Record daily precipitation	35.6 mm (1.4 in)	34 of 100 (Routine)
Ohringen	Germany	Record daily precipitation	28.3 mm (1.1 in)	34 of 100 (Routine)
Sidlaghatta	India	Record daily precipitation	63.5 mm (2.5 in)	34 of 100 (Routine)
Purcellville	United States	Record high minimum temperature	25.6 C (78.1 F)	34 of 100 (Routine)
Huron Rgnl AP	United States	Record low minimum temperature	7.2 C (45.0 F)	34 of 100 (Routine)
Hermidale Tank	Australia	Record daily precipitation	25.7 mm (1.0 in)	33 of 100 (Routine)
Concordia	United States	Record daily precipitation	71.1 mm (2.8 in)	33 of 100 (Routine)
Nome AP	United States	Record low minimum temperature	-2.8 C (27.0 F)	33 of 100 (Routine)
Schriever	United States	Record low maximum temperature	29.4 C (84.9 F)	32 of 100 (Routine)
Belhaven 1 SE	United States	Record daily precipitation	96.0 mm (3.8 in)	32 of 100 (Routine)
Kenai AP	United States	Record low maximum temperature	10.6 C (51.1 F)	32 of 100 (Routine)
Tashkent	Uzbekistan	Record high minimum temperature	21.2 C (70.2 F)	32 of 100 (Routine)
Morstone Station	Australia	Record daily precipitation	33.8 mm (1.3 in)	31 of 100 (Routine)
Albilbah	Australia	Record daily precipitation	58.4 mm (2.3 in)	31 of 100 (Routine)
Burenda	Australia	Record daily precipitation	33.0 mm (1.3 in)	31 of 100 (Routine)
Collbran	United States	Record high maximum temperature	36.1 C (97.0 F)	31 of 100 (Routine)
Curtis	United States	Record daily precipitation	34.8 mm (1.4 in)	31 of 100 (Routine)
Mahbubnagar	India	Record daily precipitation	67.3 mm (2.6 in)	30 of 100 (Routine)
Mt Pulaski	United States	Record daily precipitation	45.0 mm (1.8 in)	30 of 100 (Routine)
Wanaaring Post Office	Australia	Record daily precipitation	45.2 mm (1.8 in)	29 of 100 (Routine)
Watrap	India	Record daily precipitation	27.8 mm (1.1 in)	29 of 100 (Routine)
Marianna Sch For Boys	United States	Record daily precipitation	46.5 mm (1.8 in)	29 of 100 (Routine)
Kennebec	United States	Record low minimum temperature	6.1 C (43.0 F)	29 of 100 (Routine)
Haina 214	United States	Record low minimum temperature	16.7 C (62.1 F)	29 of 100 (Routine)
Babbiloora Station	Australia	Record daily precipitation	38.1 mm (1.5 in)	28 of 100 (Routine)
Brisbane Regional Office	Australia	Record high minimum temperature	15.0 C (59.0 F)	28 of 100 (Routine)
Lolworth	Australia	Record daily precipitation	29.7 mm (1.2 in)	28 of 100 (Routine)

Counts by Type and Timescale

573 records

Records set or tied on 18 August 1966 by type: Highest daily maximum 35, Lowest daily maximum 34, Highest daily minimum 66, Lowest daily minimum 65, Heaviest daily rainfall 373.

Records on 18 August 1966 by type
Record type	Records
Highest daily maximum	35
Lowest daily maximum	34
Highest daily minimum	66
Lowest daily minimum	65
Heaviest daily rainfall	373
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 18 August 1966 by timescale: all-time 2, monthly 17, daily 554.

How Much Records Were Beaten By

492 broken records

Margins by which the 492 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 100.5. Ties are not counted.

Top 20 by Significance

18 August 1966

Top 20 records on 18 August 1966 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 August 1966	Westland, AU	daily rain	32.3 mm (1.3 in)	32.3 mm (1.3 in)	78 years	64 of 100 (Major)
18 August 1966	Malda, IN	daily rain	145.0 mm (5.7 in)	100.5 mm (4.0 in)	60 years	64 of 100 (Major)
18 August 1966	West Quarter, AU	daily rain	33.5 mm (1.3 in)	33.5 mm (1.3 in)	53 years	56 of 100 (Notable)
18 August 1966	Lauda-Konigshofen-Gerlachsheim, DE	daily rain	51.2 mm (2.0 in)	31.0 mm (1.2 in)	35 years	53 of 100 (Notable)
18 August 1966	Maxwelton Post Office, AU	monthly rain	33.5 mm (1.3 in)	11.4 mm (0.4 in)	48 years	52 of 100 (Notable)
18 August 1966	Premer (Eden Moor), AU	daily rain	45.7 mm (1.8 in)	27.4 mm (1.1 in)	60 years	52 of 100 (Notable)
18 August 1966	Mount Morris, AU	daily rain	39.4 mm (1.6 in)	37.6 mm (1.5 in)	12 years	51 of 100 (Notable)
18 August 1966	Orange 3, AU	daily rain	66.0 mm (2.6 in)	34.2 mm (1.3 in)	40 years	51 of 100 (Notable)
18 August 1966	Greensburg, US	daily rain	76.2 mm (3.0 in)	50.8 mm (2.0 in)	15 years	51 of 100 (Notable)
18 August 1966	Tullamore (Old Post Office), AU	daily rain	35.8 mm (1.4 in)	24.9 mm (1.0 in)	40 years	50 of 100 (Notable)
18 August 1966	Arrilalah Telegraph Off, AU	daily rain	25.7 mm (1.0 in)	23.9 mm (0.9 in)	13 years	49 of 100 (Notable)
18 August 1966	Bad-Neunkirchen Mergentheim, DE	daily rain	42.0 mm (1.7 in)	22.6 mm (0.9 in)	43 years	49 of 100 (Notable)
18 August 1966	Ferrara, IT	daily rain	50.0 mm (2.0 in)	28.3 mm (1.1 in)	61 years	48 of 100 (Notable)
18 August 1966	Ekaterino-Nikolskoe, RU	daily rain	79.9 mm (3.1 in)	66.0 mm (2.6 in)	17 years	48 of 100 (Notable)
18 August 1966	Chickballapur, IN	all-time rain	142.2 mm (5.6 in)	7.6 mm (0.30 in)	55 years	47 of 100 (Notable)
18 August 1966	Ipira (Camisao), BR	daily rain	28.2 mm (1.1 in)	18.7 mm (0.7 in)	28 years	46 of 100 (Notable)
18 August 1966	Malur, IN	daily rain	99.6 mm (3.9 in)	49.3 mm (1.9 in)	28 years	46 of 100 (Notable)
18 August 1966	Ottawa, US	daily rain	148.6 mm (5.9 in)	67.1 mm (2.6 in)	5 years	45 of 100 (Notable)
18 August 1966	Ventry, AU	daily rain	32.0 mm (1.3 in)	29.5 mm (1.2 in)	23 years	41 of 100 (Notable)
18 August 1966	Chintamani, IN	daily rain	71.1 mm (2.8 in)	30.5 mm (1.2 in)	48 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

1797 to 1966

Records set or tied on this calendar date in each year from 1797 to 1966. 1966 had 573 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 1966-08-18: 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 20	452
20 to 40	33
40 to 60	4
60 to 80	2
80 to 100	0
100 to 120	1