Weather Records on 18 August 1963

760 weather records were set or tied worldwide on 18 August 1963. Highest significance: Seattle UNIV of Washin, US.

Key Facts for 18 August 1963

On 18 August 1963, 760 weather records were set or tied at long-record stations worldwide.
36 were record highs and 527 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 27 monthly and 732 daily.
Seattle UNIV of Washin set an all-time record daily precipitation of 101.6 mm (4.0 in) on 18 August 1963.
Across 171 earlier years (1797 to 2026) the same calendar date averaged 439 records.

Record Map

760 stations

760 station records on 18 August 1963 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 August 1963: highest significance records shown on the map
Station	Country	Type	Value	Significance
Seattle UNIV of Washin	United States	Record daily precipitation	101.6 mm (4.0 in)	60 of 100 (Major)
Busselton Shire	Australia	Record daily precipitation	52.3 mm (2.1 in)	58 of 100 (Notable)
Dinninup	Australia	Record daily precipitation	42.7 mm (1.7 in)	56 of 100 (Notable)
Kancheepuram	India	Record daily precipitation	119.0 mm (4.7 in)	56 of 100 (Notable)
Vouziers	France	Record daily precipitation	41.2 mm (1.6 in)	54 of 100 (Notable)
Stanley Post Office	Australia	Record daily precipitation	37.6 mm (1.5 in)	50 of 100 (Notable)
Culicup Estate	Australia	Record daily precipitation	43.4 mm (1.7 in)	49 of 100 (Notable)
Ellensfield	Australia	Record daily precipitation	45.7 mm (1.8 in)	47 of 100 (Notable)
Koebenhavn - Meteorologisk Ins	Denmark	Record daily precipitation	31.0 mm (1.2 in)	45 of 100 (Notable)
Bhusaval Sr	India	Record daily precipitation	103.0 mm (4.1 in)	44 of 100 (Notable)
Koebenhavn: Landbohojskolen-1	Denmark	Record daily precipitation	35.2 mm (1.4 in)	43 of 100 (Notable)
Ponneri	India	Record daily precipitation	54.6 mm (2.1 in)	43 of 100 (Notable)
Red Oak	United States	Record low maximum temperature	17.8 C (64.0 F)	43 of 100 (Notable)
Smithton (Grant Street)	Australia	Record daily precipitation	56.6 mm (2.2 in)	42 of 100 (Notable)
Sterling	United States	Record daily precipitation	44.2 mm (1.7 in)	42 of 100 (Notable)
Woodperry	Australia	Record daily precipitation	49.0 mm (1.9 in)	41 of 100 (Notable)
Lund	Sweden	Record daily precipitation	30.9 mm (1.2 in)	41 of 100 (Notable)
Sacaton	United States	Record daily precipitation	29.0 mm (1.1 in)	41 of 100 (Notable)
Ferndale	Australia	Record daily precipitation	91.7 mm (3.6 in)	40 of 100 (Notable)
Rheinstetten	Germany	Record daily precipitation	31.2 mm (1.2 in)	39 of 100 (Notable)
Danevang 1 W	United States	Record low minimum temperature	18.3 C (64.9 F)	39 of 100 (Notable)
Matanuska Exp Farm	United States	Record daily precipitation	33.0 mm (1.3 in)	39 of 100 (Notable)
Quindalup	Australia	Record daily precipitation	54.4 mm (2.1 in)	38 of 100 (Notable)
Av-A-Rest	Australia	Record daily precipitation	36.6 mm (1.4 in)	38 of 100 (Notable)
Haigler	United States	Record daily precipitation	44.5 mm (1.8 in)	38 of 100 (Notable)
Malmo	Sweden	Record daily precipitation	33.1 mm (1.3 in)	37 of 100 (Notable)
Reno Rs	United States	Record low maximum temperature	27.2 C (81.0 F)	37 of 100 (Notable)
Girona (Antic Institut)	Spain	Record low minimum temperature	9.7 C (49.5 F)	36 of 100 (Notable)
Osceola	United States	Record low maximum temperature	17.2 C (63.0 F)	36 of 100 (Notable)
Decatur Wtp	United States	Record low maximum temperature	18.9 C (66.0 F)	35 of 100 (Notable)
Olathe 3E	United States	Record low maximum temperature	18.3 C (64.9 F)	35 of 100 (Notable)
De Ridder	United States	Record low minimum temperature	16.7 C (62.1 F)	35 of 100 (Notable)
Keninup	Australia	Record daily precipitation	39.4 mm (1.6 in)	34 of 100 (Routine)
Riva	Italy	Record low maximum temperature	22.0 C (71.6 F)	34 of 100 (Routine)
Arcadia	United States	Record low minimum temperature	17.8 C (64.0 F)	34 of 100 (Routine)
Tuscola	United States	Record low minimum temperature	7.8 C (46.0 F)	34 of 100 (Routine)
Farmland 5 NNW	United States	Record low minimum temperature	5.6 C (42.1 F)	34 of 100 (Routine)
Kojonup	Australia	Record daily precipitation	38.6 mm (1.5 in)	33 of 100 (Routine)
Parry Sound	Canada	Record low minimum temperature	5.0 C (41.0 F)	33 of 100 (Routine)
Tuscola	United States	Record low maximum temperature	21.1 C (70.0 F)	33 of 100 (Routine)
Corning	United States	Record low maximum temperature	15.6 C (60.1 F)	33 of 100 (Routine)
Atchison	United States	Record low maximum temperature	20.0 C (68.0 F)	33 of 100 (Routine)
Collie	Australia	Record daily precipitation	42.4 mm (1.7 in)	32 of 100 (Routine)
Cherry Tree	Australia	Record daily precipitation	38.6 mm (1.5 in)	32 of 100 (Routine)
Albia 3 NNE	United States	Record low maximum temperature	17.2 C (63.0 F)	32 of 100 (Routine)
Oregon	United States	Record low maximum temperature	15.6 C (60.1 F)	32 of 100 (Routine)
Trenton	United States	Record low maximum temperature	18.9 C (66.0 F)	32 of 100 (Routine)
Liberty	United States	Record low minimum temperature	17.2 C (63.0 F)	32 of 100 (Routine)
Athipettu	India	Record daily precipitation	31.0 mm (1.2 in)	31 of 100 (Routine)
Bugulma	Russia	Record daily precipitation	31.6 mm (1.2 in)	31 of 100 (Routine)
La Harpe	United States	Record low maximum temperature	17.2 C (63.0 F)	31 of 100 (Routine)
W Lafayette 6 NW	United States	Record low minimum temperature	5.0 C (41.0 F)	31 of 100 (Routine)
Beloit	United States	Record daily precipitation	40.6 mm (1.6 in)	31 of 100 (Routine)
Cape Grim (Woolnorth)	Australia	Record daily precipitation	31.5 mm (1.2 in)	30 of 100 (Routine)
Castellon de la Plana	Spain	Record low minimum temperature	15.6 C (60.1 F)	30 of 100 (Routine)
Decatur Wtp	United States	Record low minimum temperature	7.8 C (46.0 F)	30 of 100 (Routine)
Paris Stp	United States	Record low maximum temperature	21.1 C (70.0 F)	30 of 100 (Routine)
Centerville	United States	Record low maximum temperature	17.8 C (64.0 F)	30 of 100 (Routine)
Glenwood 3SW	United States	Record low maximum temperature	19.4 C (66.9 F)	30 of 100 (Routine)
Greenfield	United States	Record low maximum temperature	17.2 C (63.0 F)	30 of 100 (Routine)

Counts by Type and Timescale

760 records

Records set or tied on 18 August 1963 by type: Highest daily maximum 18, Lowest daily maximum 257, Highest daily minimum 18, Lowest daily minimum 270, Heaviest daily rainfall 197.

Records on 18 August 1963 by type
Record type	Records
Highest daily maximum	18
Lowest daily maximum	257
Highest daily minimum	18
Lowest daily minimum	270
Heaviest daily rainfall	197
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 18 August 1963 by timescale: all-time 1, monthly 27, daily 732.

How Much Records Were Beaten By

632 broken records

Margins by which the 632 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 78.4. Ties are not counted.

Top 20 by Significance

18 August 1963

Top 20 records on 18 August 1963 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 August 1963	Seattle UNIV of Washin, US	all-time rain	101.6 mm (4.0 in)	12.7 mm (0.5 in)	41 years	60 of 100 (Major)
18 August 1963	Busselton Shire, AU	daily rain	52.3 mm (2.1 in)	29.4 mm (1.2 in)	33 years	58 of 100 (Notable)
18 August 1963	Dinninup, AU	daily rain	42.7 mm (1.7 in)	27.5 mm (1.1 in)	38 years	56 of 100 (Notable)
18 August 1963	Kancheepuram, IN	daily rain	119.0 mm (4.7 in)	78.4 mm (3.1 in)	45 years	56 of 100 (Notable)
18 August 1963	Vouziers, FR	daily rain	41.2 mm (1.6 in)	24.3 mm (1.0 in)	37 years	54 of 100 (Notable)
18 August 1963	Stanley Post Office, AU	daily rain	37.6 mm (1.5 in)	17.8 mm (0.7 in)	25 years	50 of 100 (Notable)
18 August 1963	Culicup Estate, AU	daily rain	43.4 mm (1.7 in)	25.6 mm (1.0 in)	29 years	49 of 100 (Notable)
18 August 1963	Ellensfield, AU	daily rain	45.7 mm (1.8 in)	31.7 mm (1.2 in)	8 years	47 of 100 (Notable)
18 August 1963	Koebenhavn - Meteorologisk Ins, DK	daily rain	31.0 mm (1.2 in)	12.7 mm (0.5 in)	46 years	45 of 100 (Notable)
18 August 1963	Bhusaval Sr, IN	daily rain	103.0 mm (4.1 in)	53.0 mm (2.1 in)	17 years	44 of 100 (Notable)
18 August 1963	Koebenhavn: Landbohojskolen-1, DK	daily rain	35.2 mm (1.4 in)	19.2 mm (0.8 in)	6 years	43 of 100 (Notable)
18 August 1963	Ponneri, IN	daily rain	54.6 mm (2.1 in)	34.3 mm (1.4 in)	48 years	43 of 100 (Notable)
18 August 1963	Red Oak, US	daily low max	17.8 C (64.0 F)	7.2 C (13.0 F)	65 years	43 of 100 (Notable)
18 August 1963	Smithton (Grant Street), AU	monthly rain	56.6 mm (2.2 in)	12.7 mm (0.5 in)	27 years	42 of 100 (Notable)
18 August 1963	Sterling, US	daily rain	44.2 mm (1.7 in)	25.4 mm (1.0 in)	24 years	42 of 100 (Notable)
18 August 1963	Woodperry, AU	daily rain	49.0 mm (1.9 in)	24.4 mm (1.0 in)	29 years	41 of 100 (Notable)
18 August 1963	Lund, SE	daily rain	30.9 mm (1.2 in)	1.3 mm (0.05 in)	99 years	41 of 100 (Notable)
18 August 1963	Sacaton, US	daily rain	29.0 mm (1.1 in)	26.5 mm (1.0 in)	33 years	41 of 100 (Notable)
18 August 1963	Ferndale, AU	monthly rain	91.7 mm (3.6 in)	23.4 mm (0.9 in)	0 years	40 of 100 (Notable)
18 August 1963	Rheinstetten, DE	daily rain	31.2 mm (1.2 in)	24.8 mm (1.0 in)	8 years	39 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 1963

Records set or tied on this calendar date in each year from 1797 to 1963. 1963 had 760 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 1963-08-18: 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	568
10 to 20	40
20 to 30	19
30 to 40	3
40 to 50	0
50 to 60	1
60 to 70	0
70 to 80	1