Weather Records on 18 August 2017

565 weather records were set or tied worldwide on 18 August 2017. Highest significance: Koetong, AU.

Key Facts for 18 August 2017

On 18 August 2017, 565 weather records were set or tied at long-record stations worldwide.
297 were record highs and 71 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 9 monthly and 554 daily.
Koetong set a monthly record daily precipitation of 113.8 mm (4.5 in) on 18 August 2017.
Across 171 earlier years (1797 to 2026) the same calendar date averaged 440 records.

Record Map

565 stations

565 station records on 18 August 2017 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 August 2017: highest significance records shown on the map
Station	Country	Type	Value	Significance
Koetong	Australia	Record daily precipitation	113.8 mm (4.5 in)	82 of 100 (Exceptional)
Nora_D	Sweden	Record daily precipitation	36.7 mm (1.4 in)	75 of 100 (Major)
Dohne	South Africa	Record daily precipitation	55.1 mm (2.2 in)	62 of 100 (Major)
Echunga Golf Course	Australia	Record daily precipitation	43.4 mm (1.7 in)	54 of 100 (Notable)
Karlshamn	Sweden	Record daily precipitation	36.9 mm (1.5 in)	52 of 100 (Notable)
Jessieville	United States	Record daily precipitation	51.3 mm (2.0 in)	52 of 100 (Notable)
Freiburg	Germany	Record daily precipitation	37.4 mm (1.5 in)	51 of 100 (Notable)
Natural Brg	United States	Record low minimum temperature	9.4 C (48.9 F)	49 of 100 (Notable)
Manchester AP	United States	Record daily precipitation	49.3 mm (1.9 in)	49 of 100 (Notable)
Schallstadt-Mengen	Germany	Record daily precipitation	39.7 mm (1.6 in)	48 of 100 (Notable)
Palmerville	Australia	Record high maximum temperature	37.0 C (98.6 F)	47 of 100 (Notable)
Lindenberg	Germany	Record daily precipitation	38.8 mm (1.5 in)	47 of 100 (Notable)
Orebro	Sweden	Record daily precipitation	32.5 mm (1.3 in)	46 of 100 (Notable)
Passau-Maierhof	Germany	Record daily precipitation	41.3 mm (1.6 in)	45 of 100 (Notable)
Riverhead Rsch Farm	United States	Record daily precipitation	83.3 mm (3.3 in)	44 of 100 (Notable)
Highmore	United States	Record low minimum temperature	6.1 C (43.0 F)	44 of 100 (Notable)
Lebanon	United States	Record high minimum temperature	23.9 C (75.0 F)	43 of 100 (Notable)
Korsberga	Sweden	Record daily precipitation	40.4 mm (1.6 in)	42 of 100 (Notable)
Grythyttan	Sweden	Record daily precipitation	35.7 mm (1.4 in)	42 of 100 (Notable)
Farmington	United States	Record low maximum temperature	15.6 C (60.1 F)	42 of 100 (Notable)
Kupino	Russia	Record daily precipitation	32.5 mm (1.3 in)	41 of 100 (Notable)
Wooster Exp STN	United States	Record high minimum temperature	21.1 C (70.0 F)	41 of 100 (Notable)
Winston Salem Reynolds AP	United States	Record high minimum temperature	23.3 C (73.9 F)	41 of 100 (Notable)
Donnybrook	Australia	Record low maximum temperature	12.5 C (54.5 F)	39 of 100 (Notable)
Hordern Vale	Australia	Record daily precipitation	40.2 mm (1.6 in)	38 of 100 (Notable)
Tryvasshogda	Norway	Record daily precipitation	41.7 mm (1.6 in)	38 of 100 (Notable)
Hassleby	Sweden	Record daily precipitation	30.9 mm (1.2 in)	38 of 100 (Notable)
Valentine	United States	Record daily precipitation	41.4 mm (1.6 in)	38 of 100 (Notable)
Park Rapids Muni AP	United States	Record daily precipitation	42.9 mm (1.7 in)	37 of 100 (Notable)
Ulricehamn	Sweden	Record high minimum temperature	14.8 C (58.6 F)	36 of 100 (Notable)
Lebanon Muni AP	United States	Record daily precipitation	27.9 mm (1.1 in)	36 of 100 (Notable)
Jinan	China	Record daily precipitation	66.3 mm (2.6 in)	35 of 100 (Notable)
Munchen-Nymphenburg	Germany	Record daily precipitation	34.5 mm (1.4 in)	35 of 100 (Notable)
Henan	Sweden	Record daily precipitation	30.4 mm (1.2 in)	35 of 100 (Notable)
Stearns 2S	United States	Record high minimum temperature	22.2 C (72.0 F)	35 of 100 (Notable)
Circleville	United States	Record high minimum temperature	22.8 C (73.0 F)	35 of 100 (Notable)
Wilmington 3 N	United States	Record high minimum temperature	22.2 C (72.0 F)	35 of 100 (Notable)
Vostochnaja	Russia	Record high minimum temperature	11.9 C (53.4 F)	34 of 100 (Routine)
Mtn Lake	United States	Record high maximum temperature	36.7 C (98.1 F)	34 of 100 (Routine)
Alberta Ford For Ctr	United States	Record daily precipitation	46.0 mm (1.8 in)	34 of 100 (Routine)
Walkerton 2 NW	United States	Record high minimum temperature	24.4 C (75.9 F)	34 of 100 (Routine)
Wrangell AP	United States	Record daily precipitation	25.4 mm (1.0 in)	34 of 100 (Routine)
Methoni	Greece	Record high maximum temperature	35.3 C (95.5 F)	32 of 100 (Routine)
Norsk	Russia	Record high maximum temperature	30.4 C (86.7 F)	32 of 100 (Routine)
Archbold Bio STN	United States	Record daily precipitation	93.7 mm (3.7 in)	32 of 100 (Routine)
Jamestown 4 ENE	United States	Record daily precipitation	45.7 mm (1.8 in)	32 of 100 (Routine)
Gellibrand River West	Australia	Record daily precipitation	25.0 mm (1.0 in)	31 of 100 (Routine)
Mauth-Finsterau	Germany	Record daily precipitation	28.1 mm (1.1 in)	31 of 100 (Routine)
Trout Lake 1SW	United States	Record daily precipitation	45.5 mm (1.8 in)	31 of 100 (Routine)
Winterpock	United States	Record daily precipitation	55.4 mm (2.2 in)	31 of 100 (Routine)
Mittenwald-Buckelwiesen	Germany	Record high maximum temperature	30.4 C (86.7 F)	30 of 100 (Routine)
Tarifa	Spain	Record high minimum temperature	24.6 C (76.3 F)	30 of 100 (Routine)
Sandhamn	Sweden	Record daily precipitation	25.5 mm (1.0 in)	30 of 100 (Routine)
On	Sweden	Record daily precipitation	31.8 mm (1.3 in)	30 of 100 (Routine)
Hagerstown 1E	United States	Record high minimum temperature	23.9 C (75.0 F)	30 of 100 (Routine)
Birobidzhan	Russia	Record high minimum temperature	19.1 C (66.4 F)	29 of 100 (Routine)
Sanford 2 NNW	United States	Record low minimum temperature	2.2 C (36.0 F)	29 of 100 (Routine)
Zhengzhou	China	Record daily precipitation	53.8 mm (2.1 in)	28 of 100 (Routine)
Lodejnoe Pole	Russia	Record daily precipitation	30.0 mm (1.2 in)	28 of 100 (Routine)
Seward	United States	Record low maximum temperature	19.4 C (66.9 F)	28 of 100 (Routine)

Counts by Type and Timescale

565 records

Records set or tied on 18 August 2017 by type: Highest daily maximum 89, Lowest daily maximum 35, Highest daily minimum 208, Lowest daily minimum 36, Heaviest daily rainfall 197.

Records on 18 August 2017 by type
Record type	Records
Highest daily maximum	89
Lowest daily maximum	35
Highest daily minimum	208
Lowest daily minimum	36
Heaviest daily rainfall	197
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 18 August 2017 by timescale: all-time 2, monthly 9, daily 554.

How Much Records Were Beaten By

442 broken records

Margins by which the 442 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 57.4. Ties are not counted.

Top 20 by Significance

18 August 2017

Top 20 records on 18 August 2017 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 August 2017	Koetong, AU	monthly rain	113.8 mm (4.5 in)	37.6 mm (1.5 in)	127 years	82 of 100 (Exceptional)
18 August 2017	Nora_D, SE	daily rain	36.7 mm (1.4 in)	22.2 mm (0.9 in)	131 years	75 of 100 (Major)
18 August 2017	Dohne, ZA	daily rain	55.1 mm (2.2 in)	47.6 mm (1.9 in)	52 years	62 of 100 (Major)
18 August 2017	Echunga Golf Course, AU	daily rain	43.4 mm (1.7 in)	24.4 mm (1.0 in)	36 years	54 of 100 (Notable)
18 August 2017	Karlshamn, SE	daily rain	36.9 mm (1.5 in)	7.7 mm (0.30 in)	100 years	52 of 100 (Notable)
18 August 2017	Jessieville, US	daily rain	51.3 mm (2.0 in)	25.9 mm (1.0 in)	88 years	52 of 100 (Notable)
18 August 2017	Freiburg, DE	daily rain	37.4 mm (1.5 in)	13.3 mm (0.5 in)	88 years	51 of 100 (Notable)
18 August 2017	Natural Brg, US	daily low min	9.4 C (48.9 F)	2.3 C (4.1 F)	100 years	49 of 100 (Notable)
18 August 2017	Manchester AP, US	daily rain	49.3 mm (1.9 in)	29.2 mm (1.1 in)	58 years	49 of 100 (Notable)
18 August 2017	Schallstadt-Mengen, DE	daily rain	39.7 mm (1.6 in)	17.7 mm (0.7 in)	60 years	48 of 100 (Notable)
18 August 2017	Palmerville, AU	daily high max	37.0 C (98.6 F)	1.4 C (2.5 F)	119 years	47 of 100 (Notable)
18 August 2017	Lindenberg, DE	daily rain	38.8 mm (1.5 in)	20.3 mm (0.8 in)	30 years	47 of 100 (Notable)
18 August 2017	Orebro, SE	daily rain	32.5 mm (1.3 in)	4.7 mm (0.19 in)	153 years	46 of 100 (Notable)
18 August 2017	Passau-Maierhof, DE	daily rain	41.3 mm (1.6 in)	19.6 mm (0.8 in)	43 years	45 of 100 (Notable)
18 August 2017	Riverhead Rsch Farm, US	daily rain	83.3 mm (3.3 in)	57.4 mm (2.3 in)	23 years	44 of 100 (Notable)
18 August 2017	Highmore, US	daily low min	6.1 C (43.0 F)	1.7 C (3.1 F)	121 years	44 of 100 (Notable)
18 August 2017	Lebanon, US	daily high min	23.9 C (75.0 F)	1.1 C (2.0 F)	104 years	43 of 100 (Notable)
18 August 2017	Korsberga, SE	daily rain	40.4 mm (1.6 in)	14.4 mm (0.6 in)	55 years	42 of 100 (Notable)
18 August 2017	Grythyttan, SE	daily rain	35.7 mm (1.4 in)	11.7 mm (0.5 in)	68 years	42 of 100 (Notable)
18 August 2017	Farmington, US	daily low max	15.6 C (60.1 F)	1.1 C (2.0 F)	123 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 2017

Records set or tied on this calendar date in each year from 1797 to 2017. 2017 had 565 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 2017-08-18: 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-15. Last revised 15 October 2026 (2026-10-15).

Margin	Records
0 to 10	395
10 to 20	29
20 to 30	12
30 to 40	4
40 to 50	1
50 to 60	1