Weather Records on 18 August 2018

462 weather records were set or tied worldwide on 18 August 2018. Highest significance: Watertown Wwtp, US.

Key Facts for 18 August 2018

On 18 August 2018, 462 weather records were set or tied at long-record stations worldwide.
240 were record highs and 71 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 6 monthly and 454 daily.
Watertown Wwtp set a monthly record daily precipitation of 137.7 mm (5.4 in) on 18 August 2018.
Across 171 earlier years (1797 to 2026) the same calendar date averaged 441 records.

Record Map

462 stations

462 station records on 18 August 2018 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 August 2018: highest significance records shown on the map
Station	Country	Type	Value	Significance
Watertown Wwtp	United States	Record daily precipitation	137.7 mm (5.4 in)	81 of 100 (Exceptional)
Kaycee	United States	Record daily precipitation	29.5 mm (1.2 in)	65 of 100 (Major)
Dayton 2SE	United States	Record daily precipitation	77.5 mm (3.1 in)	60 of 100 (Major)
Alejskaja	Russia	Record daily precipitation	39.1 mm (1.5 in)	59 of 100 (Notable)
Genoa	United States	Record daily precipitation	49.8 mm (2.0 in)	58 of 100 (Notable)
Boxian	China	Record daily precipitation	112.3 mm (4.4 in)	57 of 100 (Notable)
Sparta Wwtp	United States	Record daily precipitation	68.1 mm (2.7 in)	57 of 100 (Notable)
Xuzhou	China	Record daily precipitation	169.9 mm (6.7 in)	48 of 100 (Notable)
Crystal Valley	United States	Record daily precipitation	59.7 mm (2.4 in)	48 of 100 (Notable)
Sunnyside - Lund 31S	United States	Record low minimum temperature	1.1 C (34.0 F)	48 of 100 (Notable)
Great Falls 16St	United States	Record high minimum temperature	20.6 C (69.1 F)	47 of 100 (Notable)
N Tonawanda	United States	Record daily precipitation	45.7 mm (1.8 in)	47 of 100 (Notable)
Cape Sorell	Australia	Record daily precipitation	35.8 mm (1.4 in)	45 of 100 (Notable)
Nanjing	China	Record daily precipitation	116.1 mm (4.6 in)	45 of 100 (Notable)
Batavia	United States	Record daily precipitation	59.7 mm (2.4 in)	45 of 100 (Notable)
Chichibu	Japan	Record low minimum temperature	13.1 C (55.6 F)	44 of 100 (Notable)
Briksdal	Norway	Record daily precipitation	33.2 mm (1.3 in)	44 of 100 (Notable)
Skukuza	South Africa	Record low maximum temperature	10.7 C (51.3 F)	44 of 100 (Notable)
Alum Fk	United States	Record daily precipitation	68.1 mm (2.7 in)	43 of 100 (Notable)
Subiaco	United States	Record daily precipitation	50.8 mm (2.0 in)	42 of 100 (Notable)
Lockport 2SE	United States	Record daily precipitation	32.0 mm (1.3 in)	42 of 100 (Notable)
Myklebust I Breim	Norway	Record daily precipitation	27.8 mm (1.1 in)	41 of 100 (Notable)
Canyon Dam	United States	Record high maximum temperature	35.6 C (96.1 F)	41 of 100 (Notable)
Niagara Falls Intl AP	United States	Record daily precipitation	40.6 mm (1.6 in)	41 of 100 (Notable)
Greenbrier	United States	Record daily precipitation	41.7 mm (1.6 in)	40 of 100 (Notable)
Burlington	United States	Record daily precipitation	27.4 mm (1.1 in)	40 of 100 (Notable)
Plentywood	United States	Record high maximum temperature	37.2 C (99.0 F)	40 of 100 (Notable)
Otter Brook Lake	United States	Record daily precipitation	53.3 mm (2.1 in)	39 of 100 (Notable)
Kandalaksa	Russia	Record high minimum temperature	15.6 C (60.1 F)	38 of 100 (Notable)
Jornada Exp Range	United States	Record daily precipitation	33.0 mm (1.3 in)	38 of 100 (Notable)
Adiake	Cote D'Ivoire	Record high maximum temperature	31.7 C (89.1 F)	37 of 100 (Notable)
Krasnoshelye	Russia	Record high minimum temperature	14.8 C (58.6 F)	37 of 100 (Notable)
Stevensville 2SW	United States	Record high maximum temperature	35.0 C (95.0 F)	37 of 100 (Notable)
Stevensville 2SW	United States	Record high minimum temperature	25.0 C (77.0 F)	37 of 100 (Notable)
Sodankyla AWS	Finland	Record high minimum temperature	14.3 C (57.7 F)	35 of 100 (Notable)
Takayama	Japan	Record low minimum temperature	12.4 C (54.3 F)	35 of 100 (Notable)
Matsumoto	Japan	Record low minimum temperature	11.6 C (52.9 F)	35 of 100 (Notable)
Karuizawa	Japan	Record low minimum temperature	8.4 C (47.1 F)	35 of 100 (Notable)
Kofu	Japan	Record low minimum temperature	15.7 C (60.3 F)	35 of 100 (Notable)
Santa Ana Fire STN	United States	Record high minimum temperature	22.2 C (72.0 F)	35 of 100 (Notable)
Kapapala Rch 36	United States	Record daily precipitation	49.5 mm (1.9 in)	34 of 100 (Routine)
Ouesso	Congo (Brazzaville)	Record high minimum temperature	23.0 C (73.4 F)	33 of 100 (Routine)
Danville	United States	Record daily precipitation	57.9 mm (2.3 in)	33 of 100 (Routine)
Snow Hill 4 N	United States	Record high minimum temperature	26.1 C (79.0 F)	33 of 100 (Routine)
Wolf Creek Summit	United States	Record daily precipitation	27.9 mm (1.1 in)	33 of 100 (Routine)
Strahan Aerodrome	Australia	Record daily precipitation	44.2 mm (1.7 in)	32 of 100 (Routine)
Tallinn	Estonia	Record high minimum temperature	16.9 C (62.4 F)	32 of 100 (Routine)
Kumagaya	Japan	Record low minimum temperature	16.9 C (62.4 F)	32 of 100 (Routine)
Iida	Japan	Record low minimum temperature	14.3 C (57.7 F)	32 of 100 (Routine)
Botnen I Forde	Norway	Record daily precipitation	40.7 mm (1.6 in)	32 of 100 (Routine)
Reboly	Russia	Record high minimum temperature	16.4 C (61.5 F)	32 of 100 (Routine)
Strathgordon (Gordon Power Sta	Australia	Record daily precipitation	75.2 mm (3.0 in)	31 of 100 (Routine)
Suwa	Japan	Record low minimum temperature	12.6 C (54.7 F)	31 of 100 (Routine)
Nikko	Japan	Record low minimum temperature	6.3 C (43.3 F)	31 of 100 (Routine)
Atakpane	Togo	Record high minimum temperature	22.0 C (71.6 F)	31 of 100 (Routine)
Lake Placid 2 S	United States	Record daily precipitation	35.6 mm (1.4 in)	31 of 100 (Routine)
Zhumadian	China	Record daily precipitation	64.5 mm (2.5 in)	30 of 100 (Routine)
Dublin Phoenix Park	Ireland	Record high maximum temperature	26.0 C (78.8 F)	30 of 100 (Routine)
Gogland	Russia	Record high minimum temperature	19.0 C (66.2 F)	30 of 100 (Routine)
Nashville 2 NNE	United States	Record daily precipitation	26.9 mm (1.1 in)	30 of 100 (Routine)

Counts by Type and Timescale

462 records

Records set or tied on 18 August 2018 by type: Highest daily maximum 52, Lowest daily maximum 16, Highest daily minimum 188, Lowest daily minimum 55, Heaviest daily rainfall 151.

Records on 18 August 2018 by type
Record type	Records
Highest daily maximum	52
Lowest daily maximum	16
Highest daily minimum	188
Lowest daily minimum	55
Heaviest daily rainfall	151
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 18 August 2018 by timescale: all-time 2, monthly 6, daily 454.

How Much Records Were Beaten By

368 broken records

Margins by which the 368 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 122.0. Ties are not counted.

Top 20 by Significance

18 August 2018

Top 20 records on 18 August 2018 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 August 2018	Watertown Wwtp, US	monthly rain	137.7 mm (5.4 in)	38.6 mm (1.5 in)	103 years	81 of 100 (Exceptional)
18 August 2018	Kaycee, US	daily rain	29.5 mm (1.2 in)	16.5 mm (0.6 in)	109 years	65 of 100 (Major)
18 August 2018	Dayton 2SE, US	daily rain	77.5 mm (3.1 in)	51.1 mm (2.0 in)	59 years	60 of 100 (Major)
18 August 2018	Alejskaja, RU	daily rain	39.1 mm (1.5 in)	25.5 mm (1.0 in)	36 years	59 of 100 (Notable)
18 August 2018	Genoa, US	daily rain	49.8 mm (2.0 in)	29.7 mm (1.2 in)	76 years	58 of 100 (Notable)
18 August 2018	Boxian, CN	daily rain	112.3 mm (4.4 in)	73.9 mm (2.9 in)	41 years	57 of 100 (Notable)
18 August 2018	Sparta Wwtp, US	daily rain	68.1 mm (2.7 in)	40.2 mm (1.6 in)	76 years	57 of 100 (Notable)
18 August 2018	Xuzhou, CN	daily rain	169.9 mm (6.7 in)	122.0 mm (4.8 in)	8 years	48 of 100 (Notable)
18 August 2018	Crystal Valley, US	daily rain	59.7 mm (2.4 in)	36.6 mm (1.4 in)	60 years	48 of 100 (Notable)
18 August 2018	Sunnyside - Lund 31S, US	daily low min	1.1 C (34.0 F)	3.3 C (5.9 F)	125 years	48 of 100 (Notable)
18 August 2018	Great Falls 16St, US	daily high min	20.6 C (69.1 F)	2.8 C (5.0 F)	99 years	47 of 100 (Notable)
18 August 2018	N Tonawanda, US	daily rain	45.7 mm (1.8 in)	35.0 mm (1.4 in)	20 years	47 of 100 (Notable)
18 August 2018	Cape Sorell, AU	daily rain	35.8 mm (1.4 in)	7.4 mm (0.29 in)	79 years	45 of 100 (Notable)
18 August 2018	Nanjing, CN	daily rain	116.1 mm (4.6 in)	66.0 mm (2.6 in)	15 years	45 of 100 (Notable)
18 August 2018	Batavia, US	daily rain	59.7 mm (2.4 in)	34.3 mm (1.4 in)	20 years	45 of 100 (Notable)
18 August 2018	Chichibu, JP	daily low min	13.1 C (55.6 F)	4.0 C (7.2 F)	57 years	44 of 100 (Notable)
18 August 2018	Briksdal, NO	daily rain	33.2 mm (1.3 in)	4.1 mm (0.16 in)	99 years	44 of 100 (Notable)
18 August 2018	Skukuza, ZA	all-time low max	10.7 C (51.3 F)	1.9 C (3.4 F)	50 years	44 of 100 (Notable)
18 August 2018	Alum Fk, US	daily rain	68.1 mm (2.7 in)	24.9 mm (1.0 in)	68 years	43 of 100 (Notable)
18 August 2018	Subiaco, US	daily rain	50.8 mm (2.0 in)	3.3 mm (0.13 in)	103 years	42 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 2018

Records set or tied on this calendar date in each year from 1797 to 2018. 2018 had 462 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 2018-08-18: 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	341
20 to 40	21
40 to 60	2
60 to 80	3
80 to 100	0
100 to 120	0
120 to 140	1