Weather Records on 18 August 2020

1,541 weather records were set or tied worldwide on 18 August 2020. Highest significance: Groongal (Groongal Station), AU.

Key Facts for 18 August 2020

On 18 August 2020, 1,541 weather records were set or tied at long-record stations worldwide.
1,415 were record highs and 56 were record lows, counting maximum and minimum temperature.
By timescale, 12 were all-time records, 91 monthly and 1,438 daily.
Groongal (Groongal Station) set a daily record precipitation of 29.0 mm (1.1 in) on 18 August 2020.
Across 171 earlier years (1797 to 2026) the same calendar date averaged 434 records.

Record Map

1,541 stations

1,541 station records on 18 August 2020 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 August 2020: highest significance records shown on the map
Station	Country	Type	Value	Significance
Groongal (Groongal Station)	Australia	Record daily precipitation	29.0 mm (1.1 in)	68 of 100 (Major)
Blagovescensk	Russia	Record daily precipitation	67.1 mm (2.6 in)	68 of 100 (Major)
Langebaan	South Africa	Record daily precipitation	27.9 mm (1.1 in)	67 of 100 (Major)
Ganca	Azerbaijan	Record daily precipitation	99.3 mm (3.9 in)	65 of 100 (Major)
De Sabla	United States	Record high minimum temperature	27.2 C (81.0 F)	63 of 100 (Major)
Glen St Mary 1 W	United States	Record low minimum temperature	14.4 C (57.9 F)	62 of 100 (Major)
Zhangwu	China	Record daily precipitation	127.0 mm (5.0 in)	57 of 100 (Notable)
Sacramento 5 ESE	United States	Record high minimum temperature	25.0 C (77.0 F)	55 of 100 (Notable)
Pasadena	United States	Record high maximum temperature	42.8 C (109.0 F)	53 of 100 (Notable)
Newman	United States	Record high minimum temperature	26.7 C (80.1 F)	52 of 100 (Notable)
Bend	United States	Record high minimum temperature	21.1 C (70.0 F)	52 of 100 (Notable)
Napa State Hospital	United States	Record high minimum temperature	18.9 C (66.0 F)	50 of 100 (Notable)
San Luis Obispo Poly	United States	Record high minimum temperature	19.4 C (66.9 F)	48 of 100 (Notable)
Williams	United States	Record high maximum temperature	35.6 C (96.1 F)	47 of 100 (Notable)
St George	United States	Record high maximum temperature	45.0 C (113.0 F)	47 of 100 (Notable)
Sacramento AP ASOS	United States	Record high minimum temperature	22.8 C (73.0 F)	47 of 100 (Notable)
Saint Paul Is AP	United States	Record high minimum temperature	11.7 C (53.1 F)	47 of 100 (Notable)
Iron Mtn	United States	Record high minimum temperature	35.6 C (96.1 F)	46 of 100 (Notable)
San Jose	United States	Record high minimum temperature	21.1 C (70.0 F)	46 of 100 (Notable)
Santa Ana Fire STN	United States	Record high maximum temperature	41.1 C (106.0 F)	46 of 100 (Notable)
Elko Rgnl AP	United States	Record high maximum temperature	39.4 C (102.9 F)	46 of 100 (Notable)
Ajo	United States	Record high maximum temperature	46.1 C (115.0 F)	45 of 100 (Notable)
Hayfield Pumping Plt	United States	Record high minimum temperature	32.8 C (91.0 F)	45 of 100 (Notable)
Old Faithful	United States	Record high maximum temperature	31.1 C (88.0 F)	45 of 100 (Notable)
Calistoga	United States	Record high minimum temperature	19.4 C (66.9 F)	44 of 100 (Notable)
Graton	United States	Record high minimum temperature	15.6 C (60.1 F)	44 of 100 (Notable)
Kentfield	United States	Record high minimum temperature	17.8 C (64.0 F)	44 of 100 (Notable)
Madera	United States	Record high minimum temperature	25.6 C (78.1 F)	44 of 100 (Notable)
Turlock #2	United States	Record high minimum temperature	27.2 C (81.0 F)	44 of 100 (Notable)
Dayton 1 WSW	United States	Record high minimum temperature	22.8 C (73.0 F)	44 of 100 (Notable)
Hetch Hetchy	United States	Record high maximum temperature	37.2 C (99.0 F)	43 of 100 (Notable)
Stockton AP	United States	Record high minimum temperature	26.1 C (79.0 F)	43 of 100 (Notable)
Saint Paul Is AP	United States	Record high maximum temperature	15.0 C (59.0 F)	43 of 100 (Notable)
Dillon 1 E	United States	Record high maximum temperature	27.8 C (82.0 F)	42 of 100 (Notable)
Culbertson	United States	Record high maximum temperature	38.9 C (102.0 F)	42 of 100 (Notable)
Alta	United States	Record high maximum temperature	27.8 C (82.0 F)	42 of 100 (Notable)
Utah Lake Lehi	United States	Record high maximum temperature	37.2 C (99.0 F)	42 of 100 (Notable)
Forks 1 E	United States	Record high minimum temperature	15.0 C (59.0 F)	42 of 100 (Notable)
Mormon Flat	United States	Record high maximum temperature	46.1 C (115.0 F)	41 of 100 (Notable)
Bowman Dam	United States	Record high minimum temperature	19.4 C (66.9 F)	41 of 100 (Notable)
Paso Robles	United States	Record high minimum temperature	20.6 C (69.1 F)	41 of 100 (Notable)
Sonora	United States	Record high minimum temperature	21.1 C (70.0 F)	41 of 100 (Notable)
Coeur D'Alene	United States	Record high minimum temperature	21.1 C (70.0 F)	41 of 100 (Notable)
Grace	United States	Record high minimum temperature	16.7 C (62.1 F)	41 of 100 (Notable)
Gibson Dam	United States	Record high maximum temperature	37.2 C (99.0 F)	41 of 100 (Notable)
Wells	United States	Record high maximum temperature	36.1 C (97.0 F)	41 of 100 (Notable)
Heppner	United States	Record high minimum temperature	20.6 C (69.1 F)	41 of 100 (Notable)
Cody	United States	Record high maximum temperature	36.1 C (97.0 F)	41 of 100 (Notable)
Koebenhavn: Landbohojskolen-1	Denmark	Record high minimum temperature	18.4 C (65.1 F)	40 of 100 (Notable)
Boras	Sweden	Record high maximum temperature	28.3 C (82.9 F)	40 of 100 (Notable)
Fairmont	United States	Record high maximum temperature	41.7 C (107.1 F)	40 of 100 (Notable)
Indio Fire STN	United States	Record high minimum temperature	33.3 C (91.9 F)	40 of 100 (Notable)
Newport Beach Harbor	United States	Record high maximum temperature	30.6 C (87.1 F)	40 of 100 (Notable)
Priest Rvr Exp STN	United States	Record high minimum temperature	15.0 C (59.0 F)	40 of 100 (Notable)
Pineview Dam	United States	Record high maximum temperature	36.7 C (98.1 F)	40 of 100 (Notable)
Rosalia	United States	Record high minimum temperature	20.6 C (69.1 F)	40 of 100 (Notable)
Wasserkuppe	Germany	Record daily precipitation	43.6 mm (1.7 in)	39 of 100 (Notable)
Barcelona/Aeropuerto	Spain	Record high minimum temperature	24.9 C (76.8 F)	39 of 100 (Notable)
Quartzsite	United States	Record high maximum temperature	46.7 C (116.1 F)	39 of 100 (Notable)
Ft Ross	United States	Record high maximum temperature	26.7 C (80.1 F)	39 of 100 (Notable)

Counts by Type and Timescale

1,541 records

Records set or tied on 18 August 2020 by type: Highest daily maximum 721, Lowest daily maximum 26, Highest daily minimum 694, Lowest daily minimum 30, Heaviest daily rainfall 70.

Records on 18 August 2020 by type
Record type	Records
Highest daily maximum	721
Lowest daily maximum	26
Highest daily minimum	694
Lowest daily minimum	30
Heaviest daily rainfall	70
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 18 August 2020 by timescale: all-time 12, monthly 91, daily 1,438.

How Much Records Were Beaten By

1,238 broken records

Margins by which the 1,238 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 86.1. Ties are not counted.

Top 20 by Significance

18 August 2020

Top 20 records on 18 August 2020 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 August 2020	Groongal (Groongal Station), AU	daily rain	29.0 mm (1.1 in)	15.8 mm (0.6 in)	138 years	68 of 100 (Major)
18 August 2020	Blagovescensk, RU	daily rain	67.1 mm (2.6 in)	34.1 mm (1.3 in)	138 years	68 of 100 (Major)
18 August 2020	Langebaan, ZA	daily rain	27.9 mm (1.1 in)	18.2 mm (0.7 in)	104 years	67 of 100 (Major)
18 August 2020	Ganca, AZ	daily rain	99.3 mm (3.9 in)	78.4 mm (3.1 in)	53 years	65 of 100 (Major)
18 August 2020	De Sabla, US	daily high min	27.2 C (81.0 F)	7.2 C (13.0 F)	114 years	63 of 100 (Major)
18 August 2020	Glen St Mary 1 W, US	daily low min	14.4 C (57.9 F)	3.9 C (7.0 F)	95 years	62 of 100 (Major)
18 August 2020	Zhangwu, CN	daily rain	127.0 mm (5.0 in)	86.1 mm (3.4 in)	38 years	57 of 100 (Notable)
18 August 2020	Sacramento 5 ESE, US	daily high min	25.0 C (77.0 F)	3.9 C (7.0 F)	136 years	55 of 100 (Notable)
18 August 2020	Pasadena, US	monthly high max	42.8 C (109.0 F)	1.1 C (2.0 F)	102 years	53 of 100 (Notable)
18 August 2020	Newman, US	daily high min	26.7 C (80.1 F)	4.5 C (8.1 F)	95 years	52 of 100 (Notable)
18 August 2020	Bend, US	monthly high min	21.1 C (70.0 F)	1.1 C (2.0 F)	119 years	52 of 100 (Notable)
18 August 2020	Napa State Hospital, US	daily high min	18.9 C (66.0 F)	2.2 C (4.0 F)	123 years	50 of 100 (Notable)
18 August 2020	San Luis Obispo Poly, US	daily high min	19.4 C (66.9 F)	3.8 C (6.8 F)	62 years	48 of 100 (Notable)
18 August 2020	Williams, US	daily high max	35.6 C (96.1 F)	2.3 C (4.1 F)	105 years	47 of 100 (Notable)
18 August 2020	St George, US	daily high max	45.0 C (113.0 F)	2.2 C (4.0 F)	122 years	47 of 100 (Notable)
18 August 2020	Sacramento AP ASOS, US	daily high min	22.8 C (73.0 F)	4.5 C (8.1 F)	60 years	47 of 100 (Notable)
18 August 2020	Saint Paul Is AP, US	daily high min	11.7 C (53.1 F)	1.7 C (3.1 F)	94 years	47 of 100 (Notable)
18 August 2020	Iron Mtn, US	monthly high min	35.6 C (96.1 F)	1.2 C (2.2 F)	82 years	46 of 100 (Notable)
18 August 2020	San Jose, US	daily high min	21.1 C (70.0 F)	4.4 C (7.9 F)	62 years	46 of 100 (Notable)
18 August 2020	Santa Ana Fire STN, US	monthly high max	41.1 C (106.0 F)	0.5 C (0.9 F)	85 years	46 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 2020

Records set or tied on this calendar date in each year from 1797 to 2020. 2020 had 1,541 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 2020-08-18: 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	1,226
20 to 40	9
40 to 60	1
60 to 80	1
80 to 100	1