Weather Records on 18 August 1990

920 weather records were set or tied worldwide on 18 August 1990. Highest significance: Selby, US.

Key Facts for 18 August 1990

On 18 August 1990, 920 weather records were set or tied at long-record stations worldwide.
288 were record highs and 167 were record lows, counting maximum and minimum temperature.
By timescale, 5 were all-time records, 28 monthly and 887 daily.
Selby set a monthly record daily precipitation of 88.1 mm (3.5 in) on 18 August 1990.
Across 171 earlier years (1797 to 2026) the same calendar date averaged 438 records.

Record Map

920 stations

920 station records on 18 August 1990 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 August 1990: highest significance records shown on the map
Station	Country	Type	Value	Significance
Selby	United States	Record daily precipitation	88.1 mm (3.5 in)	81 of 100 (Exceptional)
Weyerhaeuser 1N	United States	Record daily precipitation	149.9 mm (5.9 in)	76 of 100 (Major)
Benson	United States	Record daily precipitation	141.5 mm (5.6 in)	69 of 100 (Major)
Rochester	United States	Record daily precipitation	158.8 mm (6.3 in)	67 of 100 (Major)
Escanaba	United States	Record daily precipitation	64.3 mm (2.5 in)	67 of 100 (Major)
Winamac 2SSE	United States	Record daily precipitation	85.1 mm (3.4 in)	65 of 100 (Major)
Cambridge	United States	Record daily precipitation	82.0 mm (3.2 in)	65 of 100 (Major)
Hobart 2 WNW	United States	Record daily precipitation	96.5 mm (3.8 in)	63 of 100 (Major)
New London	United States	Record daily precipitation	89.4 mm (3.5 in)	62 of 100 (Major)
Valparaiso Wtr Wks	United States	Record daily precipitation	112.3 mm (4.4 in)	60 of 100 (Major)
Ridgeland 1NNE	United States	Record daily precipitation	133.4 mm (5.3 in)	60 of 100 (Major)
San Angel	Mexico	Record daily precipitation	122.4 mm (4.8 in)	59 of 100 (Notable)
Hatfield	United States	Record daily precipitation	80.0 mm (3.1 in)	59 of 100 (Notable)
Petoskey	United States	Record daily precipitation	64.0 mm (2.5 in)	58 of 100 (Notable)
Akron 4 E	United States	Record daily precipitation	45.7 mm (1.8 in)	55 of 100 (Notable)
Medford	United States	Record daily precipitation	76.2 mm (3.0 in)	55 of 100 (Notable)
Lake Mills Wwtp	United States	Record daily precipitation	125.2 mm (4.9 in)	54 of 100 (Notable)
Fazenda Conquista	Brazil	Record daily precipitation	28.3 mm (1.1 in)	53 of 100 (Notable)
Milan 1NW	United States	Record daily precipitation	72.4 mm (2.9 in)	53 of 100 (Notable)
Ellendale	United States	Record daily precipitation	44.5 mm (1.8 in)	52 of 100 (Notable)
Columbia 8 N	United States	Record daily precipitation	47.2 mm (1.9 in)	52 of 100 (Notable)
Veraval	India	Record daily precipitation	301.0 mm (11.9 in)	50 of 100 (Notable)
Lewistown 11 SSE	United States	Record daily precipitation	46.0 mm (1.8 in)	50 of 100 (Notable)
Marshfield Exp Farm	United States	Record daily precipitation	66.0 mm (2.6 in)	50 of 100 (Notable)
Pollock	United States	Record daily precipitation	66.0 mm (2.6 in)	49 of 100 (Notable)
Great Falls AP	United States	Record daily precipitation	40.1 mm (1.6 in)	49 of 100 (Notable)
San Felipe Usila	Mexico	Record daily precipitation	239.8 mm (9.4 in)	48 of 100 (Notable)
Ovre_Svartla	Sweden	Record daily precipitation	26.9 mm (1.1 in)	48 of 100 (Notable)
Santiago 3 E	United States	Record daily precipitation	84.1 mm (3.3 in)	48 of 100 (Notable)
Tiber Dam	United States	Record daily precipitation	35.1 mm (1.4 in)	48 of 100 (Notable)
Spalding 1 NW	United States	Record daily precipitation	111.0 mm (4.4 in)	47 of 100 (Notable)
Kenosha Wwtp	United States	Record daily precipitation	87.6 mm (3.4 in)	47 of 100 (Notable)
Iguatama	Brazil	Record daily precipitation	27.5 mm (1.1 in)	46 of 100 (Notable)
Illahe	United States	Record daily precipitation	42.4 mm (1.7 in)	46 of 100 (Notable)
Powers	United States	Record daily precipitation	30.0 mm (1.2 in)	46 of 100 (Notable)
Fairchild Rs	United States	Record daily precipitation	89.4 mm (3.5 in)	46 of 100 (Notable)
Parkersburg AP	United States	Record daily precipitation	85.9 mm (3.4 in)	46 of 100 (Notable)
Duluth	United States	Record daily precipitation	69.9 mm (2.8 in)	46 of 100 (Notable)
Alvsbyn_A	Sweden	Record daily precipitation	30.0 mm (1.2 in)	45 of 100 (Notable)
Charlevoix	United States	Record daily precipitation	28.7 mm (1.1 in)	45 of 100 (Notable)
Portland 1 SW	United States	Record daily precipitation	55.9 mm (2.2 in)	44 of 100 (Notable)
Blanchardville #2	United States	Record daily precipitation	91.7 mm (3.6 in)	44 of 100 (Notable)
Rice Lake	United States	Record daily precipitation	82.8 mm (3.3 in)	44 of 100 (Notable)
Wisconsin Rapids	United States	Record daily precipitation	47.0 mm (1.9 in)	44 of 100 (Notable)
Usina Esmeril (Cpfl) B4-005	Brazil	Record daily precipitation	37.8 mm (1.5 in)	43 of 100 (Notable)
Inchanga (Sar)	South Africa	Record daily precipitation	46.6 mm (1.8 in)	43 of 100 (Notable)
Roscoe	United States	Record daily precipitation	50.8 mm (2.0 in)	43 of 100 (Notable)
La Crosse Muni AP	United States	Record daily precipitation	52.6 mm (2.1 in)	43 of 100 (Notable)
Berkeley	United States	Record high minimum temperature	15.0 C (59.0 F)	41 of 100 (Notable)
Wabash	United States	Record daily precipitation	76.7 mm (3.0 in)	41 of 100 (Notable)
Madeline Is	United States	Record daily precipitation	61.0 mm (2.4 in)	41 of 100 (Notable)
Melo Franco	Brazil	Record daily precipitation	25.0 mm (1.0 in)	40 of 100 (Notable)
Batatais	Brazil	Record daily precipitation	34.2 mm (1.3 in)	40 of 100 (Notable)
Goodrich 1 E	United States	Record daily precipitation	40.6 mm (1.6 in)	40 of 100 (Notable)
Jokkmokk	Sweden	Record daily precipitation	34.1 mm (1.3 in)	39 of 100 (Notable)
Neillsville 3ESE	United States	Record daily precipitation	63.2 mm (2.5 in)	39 of 100 (Notable)
Naalehu 14	United States	Record high minimum temperature	25.0 C (77.0 F)	39 of 100 (Notable)
Koskats	Sweden	Record daily precipitation	30.2 mm (1.2 in)	38 of 100 (Notable)
Watersmeet	United States	Record daily precipitation	29.2 mm (1.1 in)	38 of 100 (Notable)
Beavertown 1 NE	United States	Record daily precipitation	48.0 mm (1.9 in)	38 of 100 (Notable)

Counts by Type and Timescale

920 records

Records set or tied on 18 August 1990 by type: Highest daily maximum 122, Lowest daily maximum 86, Highest daily minimum 166, Lowest daily minimum 81, Heaviest daily rainfall 465.

Records on 18 August 1990 by type
Record type	Records
Highest daily maximum	122
Lowest daily maximum	86
Highest daily minimum	166
Lowest daily minimum	81
Heaviest daily rainfall	465
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 18 August 1990 by timescale: all-time 5, monthly 28, daily 887.

How Much Records Were Beaten By

765 broken records

Margins by which the 765 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 167.9. Ties are not counted.

Top 20 by Significance

18 August 1990

Top 20 records on 18 August 1990 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 August 1990	Selby, US	monthly rain	88.1 mm (3.5 in)	45.9 mm (1.8 in)	79 years	81 of 100 (Exceptional)
18 August 1990	Weyerhaeuser 1N, US	all-time rain	149.9 mm (5.9 in)	46.8 mm (1.8 in)	48 years	76 of 100 (Major)
18 August 1990	Benson, US	all-time rain	141.5 mm (5.6 in)	51.3 mm (2.0 in)	21 years	69 of 100 (Major)
18 August 1990	Rochester, US	all-time rain	158.8 mm (6.3 in)	38.9 mm (1.5 in)	34 years	67 of 100 (Major)
18 August 1990	Escanaba, US	daily rain	64.3 mm (2.5 in)	28.2 mm (1.1 in)	113 years	67 of 100 (Major)
18 August 1990	Winamac 2SSE, US	daily rain	85.1 mm (3.4 in)	54.9 mm (2.2 in)	53 years	65 of 100 (Major)
18 August 1990	Cambridge, US	daily rain	82.0 mm (3.2 in)	62.9 mm (2.5 in)	55 years	65 of 100 (Major)
18 August 1990	Hobart 2 WNW, US	daily rain	96.5 mm (3.8 in)	56.9 mm (2.2 in)	53 years	63 of 100 (Major)
18 August 1990	New London, US	daily rain	89.4 mm (3.5 in)	41.1 mm (1.6 in)	76 years	62 of 100 (Major)
18 August 1990	Valparaiso Wtr Wks, US	daily rain	112.3 mm (4.4 in)	60.2 mm (2.4 in)	39 years	60 of 100 (Major)
18 August 1990	Ridgeland 1NNE, US	all-time rain	133.4 mm (5.3 in)	37.4 mm (1.5 in)	37 years	60 of 100 (Major)
18 August 1990	San Angel, MX	monthly rain	122.4 mm (4.8 in)	45.9 mm (1.8 in)	24 years	59 of 100 (Notable)
18 August 1990	Hatfield, US	daily rain	80.0 mm (3.1 in)	40.6 mm (1.6 in)	73 years	59 of 100 (Notable)
18 August 1990	Petoskey, US	daily rain	64.0 mm (2.5 in)	34.8 mm (1.4 in)	49 years	58 of 100 (Notable)
18 August 1990	Akron 4 E, US	daily rain	45.7 mm (1.8 in)	33.0 mm (1.3 in)	72 years	55 of 100 (Notable)
18 August 1990	Medford, US	daily rain	76.2 mm (3.0 in)	30.5 mm (1.2 in)	76 years	55 of 100 (Notable)
18 August 1990	Lake Mills Wwtp, US	monthly rain	125.2 mm (4.9 in)	21.6 mm (0.9 in)	66 years	54 of 100 (Notable)
18 August 1990	Fazenda Conquista, BR	daily rain	28.3 mm (1.1 in)	28.3 mm (1.1 in)	48 years	53 of 100 (Notable)
18 August 1990	Milan 1NW, US	daily rain	72.4 mm (2.9 in)	31.3 mm (1.2 in)	65 years	53 of 100 (Notable)
18 August 1990	Ellendale, US	daily rain	44.5 mm (1.8 in)	19.1 mm (0.8 in)	87 years	52 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 1990

Records set or tied on this calendar date in each year from 1797 to 1990. 1990 had 920 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 1990-08-18: 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 25	704
25 to 50	46
50 to 75	12
75 to 100	1
100 to 125	1
125 to 150	0
150 to 175	1