Weather Records on 17 August 2018

518 weather records were set or tied worldwide on 17 August 2018. Highest significance: Brodhead Wwtp, US.

Key Facts for 17 August 2018

On 17 August 2018, 518 weather records were set or tied at long-record stations worldwide.
313 were record highs and 29 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 6 monthly and 511 daily.
Brodhead Wwtp set a daily record precipitation of 113.5 mm (4.5 in) on 17 August 2018.
Across 162 earlier years (1797 to 2026) the same calendar date averaged 473 records.

Record Map

518 stations

518 station records on 17 August 2018 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 August 2018: highest significance records shown on the map
Station	Country	Type	Value	Significance
Brodhead Wwtp	United States	Record daily precipitation	113.5 mm (4.5 in)	79 of 100 (Major)
Lake Mills Wwtp	United States	Record daily precipitation	86.4 mm (3.4 in)	72 of 100 (Major)
Mirnyj	Russia	Record daily precipitation	82.1 mm (3.2 in)	70 of 100 (Major)
Watertown Wwtp	United States	Record daily precipitation	73.7 mm (2.9 in)	64 of 100 (Major)
Pittsfield Muni AP	United States	Record daily precipitation	68.3 mm (2.7 in)	62 of 100 (Major)
Strasbourg-Entzheim	France	Record daily precipitation	51.8 mm (2.0 in)	61 of 100 (Major)
Nanjing	China	Record daily precipitation	128.3 mm (5.1 in)	56 of 100 (Notable)
Menorca/Mao	Spain	Record daily precipitation	54.7 mm (2.2 in)	56 of 100 (Notable)
Corning	United States	Record daily precipitation	73.2 mm (2.9 in)	56 of 100 (Notable)
Ukiah	United States	Record daily precipitation	41.1 mm (1.6 in)	56 of 100 (Notable)
Weimar-Schondorf	Germany	Record daily precipitation	45.8 mm (1.8 in)	49 of 100 (Notable)
Eureka 1E	United States	Record daily precipitation	55.6 mm (2.2 in)	49 of 100 (Notable)
Cynthiana	United States	Record daily precipitation	61.0 mm (2.4 in)	49 of 100 (Notable)
Dix Dam	United States	Record daily precipitation	50.8 mm (2.0 in)	49 of 100 (Notable)
Girona/Costa Brava	Spain	Record daily precipitation	80.3 mm (3.2 in)	48 of 100 (Notable)
Hefei	China	Record daily precipitation	161.8 mm (6.4 in)	47 of 100 (Notable)
Ft Atkinson Wwtp	United States	Record daily precipitation	61.7 mm (2.4 in)	47 of 100 (Notable)
Flagler 1S	United States	Record daily precipitation	47.2 mm (1.9 in)	46 of 100 (Notable)
Sihccajavri	Norway	Record daily precipitation	44.4 mm (1.7 in)	45 of 100 (Notable)
Waseca S Rsch & Outreach Ctr	United States	Record daily precipitation	38.1 mm (1.5 in)	45 of 100 (Notable)
El Dorado Goodwin Fld	United States	Record daily precipitation	34.5 mm (1.4 in)	45 of 100 (Notable)
Kings Mills	United States	Record daily precipitation	39.9 mm (1.6 in)	44 of 100 (Notable)
Amraoti	India	Record daily precipitation	57.9 mm (2.3 in)	43 of 100 (Notable)
Danville	United States	Record daily precipitation	46.0 mm (1.8 in)	43 of 100 (Notable)
Lingling	China	Record daily precipitation	151.1 mm (5.9 in)	42 of 100 (Notable)
Hillsboro	United States	Record daily precipitation	43.2 mm (1.7 in)	42 of 100 (Notable)
Afton - Janesville Wwtp	United States	Record daily precipitation	72.9 mm (2.9 in)	42 of 100 (Notable)
Lynxville Dam 9	United States	Record daily precipitation	59.2 mm (2.3 in)	42 of 100 (Notable)
Plauen	Germany	Record high maximum temperature	32.9 C (91.2 F)	41 of 100 (Notable)
Hakodate	Japan	Record daily precipitation	99.1 mm (3.9 in)	41 of 100 (Notable)
Biser	Russia	Record daily precipitation	31.0 mm (1.2 in)	40 of 100 (Notable)
Poughkeepsie AP	United States	Record daily precipitation	48.8 mm (1.9 in)	40 of 100 (Notable)
Greenbrier	United States	Record daily precipitation	43.9 mm (1.7 in)	39 of 100 (Notable)
Darlington Wwtp	United States	Record daily precipitation	43.2 mm (1.7 in)	39 of 100 (Notable)
Sihccajavri	Norway	Record high minimum temperature	12.4 C (54.3 F)	38 of 100 (Notable)
Gnesta	Sweden	Record daily precipitation	31.5 mm (1.2 in)	38 of 100 (Notable)
Jorn	Sweden	Record daily precipitation	31.6 mm (1.2 in)	38 of 100 (Notable)
Botkinburg 3 NE	United States	Record daily precipitation	101.6 mm (4.0 in)	38 of 100 (Notable)
Paragould 1S	United States	Record daily precipitation	70.6 mm (2.8 in)	38 of 100 (Notable)
Sewanee	United States	Record daily precipitation	38.1 mm (1.5 in)	38 of 100 (Notable)
Angermunde	Germany	Record high maximum temperature	32.1 C (89.8 F)	37 of 100 (Notable)
Fairfield	United States	Record high minimum temperature	18.9 C (66.0 F)	37 of 100 (Notable)
Abashiri	Japan	Record daily precipitation	69.6 mm (2.7 in)	36 of 100 (Notable)
Hector 4 SE	United States	Record daily precipitation	49.5 mm (1.9 in)	36 of 100 (Notable)
Lazy Mtn	United States	Record daily precipitation	58.4 mm (2.3 in)	36 of 100 (Notable)
Cold Bay AP	United States	Record low minimum temperature	1.1 C (34.0 F)	36 of 100 (Notable)
Dzaore	Russia	Record low minimum temperature	5.5 C (41.9 F)	35 of 100 (Notable)
Linguere	Senegal	Record high maximum temperature	41.7 C (107.1 F)	35 of 100 (Notable)
Damascus 2 NNE	United States	Record daily precipitation	82.6 mm (3.3 in)	35 of 100 (Notable)
Zaragoza	Spain	Record daily precipitation	32.5 mm (1.3 in)	34 of 100 (Routine)
Oolitic Purdue Ex Fm	United States	Record daily precipitation	84.6 mm (3.3 in)	34 of 100 (Routine)
Greenwood Leflore AP	United States	Record daily precipitation	53.8 mm (2.1 in)	34 of 100 (Routine)
Madison Dane Co Rgnl AP	United States	Record daily precipitation	38.6 mm (1.5 in)	34 of 100 (Routine)
Bad-Neunkirchen Mergentheim	Germany	Record high maximum temperature	34.8 C (94.6 F)	33 of 100 (Routine)
Bradford 4SW Rsch 5	United States	Record daily precipitation	30.0 mm (1.2 in)	33 of 100 (Routine)
Beaver Dam Wwtp	United States	Record daily precipitation	62.5 mm (2.5 in)	33 of 100 (Routine)
Stoughton Wwtp	United States	Record daily precipitation	46.7 mm (1.8 in)	33 of 100 (Routine)
Huoshan	China	Record daily precipitation	122.7 mm (4.8 in)	32 of 100 (Routine)
Worthington 2 NNE	United States	Record daily precipitation	89.4 mm (3.5 in)	32 of 100 (Routine)
Sweet Springs	United States	Record daily precipitation	68.6 mm (2.7 in)	32 of 100 (Routine)

Counts by Type and Timescale

518 records

Records set or tied on 17 August 2018 by type: Highest daily maximum 115, Lowest daily maximum 12, Highest daily minimum 198, Lowest daily minimum 17, Heaviest daily rainfall 176.

Records on 17 August 2018 by type
Record type	Records
Highest daily maximum	115
Lowest daily maximum	12
Highest daily minimum	198
Lowest daily minimum	17
Heaviest daily rainfall	176
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 17 August 2018 by timescale: all-time 1, monthly 6, daily 511.

How Much Records Were Beaten By

411 broken records

Margins by which the 411 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 72.8. Ties are not counted.

Top 20 by Significance

17 August 2018

Top 20 records on 17 August 2018 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 August 2018	Brodhead Wwtp, US	daily rain	113.5 mm (4.5 in)	67.8 mm (2.7 in)	96 years	79 of 100 (Major)
17 August 2018	Lake Mills Wwtp, US	daily rain	86.4 mm (3.4 in)	47.8 mm (1.9 in)	123 years	72 of 100 (Major)
17 August 2018	Mirnyj, RU	all-time rain	82.1 mm (3.2 in)	30.1 mm (1.2 in)	15 years	70 of 100 (Major)
17 August 2018	Watertown Wwtp, US	daily rain	73.7 mm (2.9 in)	29.5 mm (1.2 in)	104 years	64 of 100 (Major)
17 August 2018	Pittsfield Muni AP, US	daily rain	68.3 mm (2.7 in)	38.8 mm (1.5 in)	59 years	62 of 100 (Major)
17 August 2018	Strasbourg-Entzheim, FR	daily rain	51.8 mm (2.0 in)	30.2 mm (1.2 in)	40 years	61 of 100 (Major)
17 August 2018	Nanjing, CN	daily rain	128.3 mm (5.1 in)	72.8 mm (2.9 in)	43 years	56 of 100 (Notable)
17 August 2018	Menorca/Mao, ES	daily rain	54.7 mm (2.2 in)	46.2 mm (1.8 in)	39 years	56 of 100 (Notable)
17 August 2018	Corning, US	daily rain	73.2 mm (2.9 in)	29.8 mm (1.2 in)	92 years	56 of 100 (Notable)
17 August 2018	Ukiah, US	daily rain	41.1 mm (1.6 in)	30.9 mm (1.2 in)	24 years	56 of 100 (Notable)
17 August 2018	Weimar-Schondorf, DE	daily rain	45.8 mm (1.8 in)	28.0 mm (1.1 in)	8 years	49 of 100 (Notable)
17 August 2018	Eureka 1E, US	daily rain	55.6 mm (2.2 in)	16.0 mm (0.6 in)	108 years	49 of 100 (Notable)
17 August 2018	Cynthiana, US	daily rain	61.0 mm (2.4 in)	29.2 mm (1.1 in)	59 years	49 of 100 (Notable)
17 August 2018	Dix Dam, US	daily rain	50.8 mm (2.0 in)	39.6 mm (1.6 in)	48 years	49 of 100 (Notable)
17 August 2018	Girona/Costa Brava, ES	daily rain	80.3 mm (3.2 in)	70.1 mm (2.8 in)	15 years	48 of 100 (Notable)
17 August 2018	Hefei, CN	monthly rain	161.8 mm (6.4 in)	32.2 mm (1.3 in)	44 years	47 of 100 (Notable)
17 August 2018	Ft Atkinson Wwtp, US	daily rain	61.7 mm (2.4 in)	31.0 mm (1.2 in)	52 years	47 of 100 (Notable)
17 August 2018	Flagler 1S, US	daily rain	47.2 mm (1.9 in)	29.7 mm (1.2 in)	43 years	46 of 100 (Notable)
17 August 2018	Sihccajavri, NO	daily rain	44.4 mm (1.7 in)	16.0 mm (0.6 in)	16 years	45 of 100 (Notable)
17 August 2018	Waseca S Rsch & Outreach Ctr, US	daily rain	38.1 mm (1.5 in)	9.1 mm (0.36 in)	101 years	45 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 518 records.

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

Records on 08-17 in each year
Year	Records
1797	2
1802	2
1820	2
1837	1
1838	2
1841	2
1842	1
1845	2
1853	1
1854	1
1856	1
1857	1
1861	3
1862	1
1867	1
1868	3
1869	1
1872	1
1875	2
1876	5
1879	1
1881	1
1882	1
1883	2
1885	3
1886	1
1888	5
1891	1
1892	3
1893	2
1894	3
1895	2
1896	3
1897	1
1898	5
1899	8
1900	3
1901	14
1902	7
1903	6
1904	2
1905	11
1906	28
1907	9
1908	26
1909	24
1910	17
1911	18
1912	31
1913	79
1914	41
1915	28
1916	33
1917	35
1918	112
1919	37
1920	110
1921	37
1922	169
1923	161
1924	171
1925	130
1926	182
1927	228
1928	131
1929	243
1930	138
1931	302
1932	360
1933	260
1934	377
1935	437
1936	670
1937	726
1938	466
1939	364
1940	341
1941	378
1942	461
1943	743
1944	531
1945	387
1946	433
1947	682
1948	475
1949	371
1950	522
1951	413
1952	470
1953	345
1954	685
1955	465
1956	407
1957	504
1958	519
1959	543
1960	533
1961	998
1962	445
1963	650
1964	410
1965	641
1966	496
1967	679
1968	953
1969	593
1970	467
1971	447
1972	1,044
1973	750
1974	582
1975	612
1976	797
1977	1,216
1978	814
1979	1,464
1980	895
1981	1,112
1982	554
1983	1,574
1984	726
1985	948
1986	916
1987	1,150
1988	1,608
1989	687
1990	949
1991	560
1992	1,813
1993	803
1994	1,038
1995	1,724
1996	752
1997	1,544
1998	1,003
1999	697
2000	994
2001	1,101
2002	1,266
2003	948
2004	1,046
2005	722
2006	814
2007	1,646
2008	1,301
2009	922
2010	1,105
2011	956
2012	1,215
2013	802
2014	997
2015	890
2016	748
2017	544
2018	518
2019	467
2020	1,529
2021	800
2022	1,428
2023	1,032
2024	740
2025	538
2026	535

Download the Data

Data for records on 2018-08-17: 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	339
10 to 20	35
20 to 30	14
30 to 40	12
40 to 50	4
50 to 60	4
60 to 70	1
70 to 80	2