Weather Records on 18 August 2021

1,118 weather records were set or tied worldwide on 18 August 2021. Highest significance: Suhana, RU.

Key Facts for 18 August 2021

On 18 August 2021, 1,118 weather records were set or tied at long-record stations worldwide.
282 were record highs and 409 were record lows, counting maximum and minimum temperature.
By timescale, 18 were all-time records, 60 monthly and 1,040 daily.
Suhana set an all-time record daily precipitation of 99.1 mm (3.9 in) on 18 August 2021.
Across 171 earlier years (1797 to 2026) the same calendar date averaged 437 records.

Record Map

1,118 stations

1,118 station records on 18 August 2021 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 August 2021: highest significance records shown on the map
Station	Country	Type	Value	Significance
Suhana	Russia	Record daily precipitation	99.1 mm (3.9 in)	91 of 100 (Exceptional)
Delta	United States	Record daily precipitation	111.5 mm (4.4 in)	90 of 100 (Exceptional)
Oak City	United States	Record daily precipitation	57.4 mm (2.3 in)	82 of 100 (Exceptional)
Cullowhee	United States	Record daily precipitation	77.7 mm (3.1 in)	80 of 100 (Exceptional)
Tyler Pounds Fld	United States	Record daily precipitation	120.7 mm (4.8 in)	80 of 100 (Exceptional)
Hayden Fork	United States	Record daily precipitation	94.0 mm (3.7 in)	76 of 100 (Major)
Kjobli I Snaasa	Norway	Record daily precipitation	50.9 mm (2.0 in)	74 of 100 (Major)
Cornelia	United States	Record daily precipitation	149.1 mm (5.9 in)	74 of 100 (Major)
Tooele	United States	Record daily precipitation	29.2 mm (1.1 in)	74 of 100 (Major)
Rock Creek	United States	Record daily precipitation	91.4 mm (3.6 in)	72 of 100 (Major)
Tian-Shan	Kyrgyzstan	Record daily precipitation	99.6 mm (3.9 in)	71 of 100 (Major)
Lakefork #1	United States	Record daily precipitation	83.8 mm (3.3 in)	71 of 100 (Major)
Elizabethton	United States	Record daily precipitation	63.8 mm (2.5 in)	69 of 100 (Major)
Elmira Corning Rgnl AP	United States	Record daily precipitation	84.8 mm (3.3 in)	69 of 100 (Major)
Dzalinda-1	Russia	Record daily precipitation	99.1 mm (3.9 in)	68 of 100 (Major)
Cleveland	United States	Record daily precipitation	131.1 mm (5.2 in)	68 of 100 (Major)
Rome	United States	Record daily precipitation	84.1 mm (3.3 in)	67 of 100 (Major)
Highlands	United States	Record daily precipitation	115.6 mm (4.6 in)	67 of 100 (Major)
Waynesville 1 E	United States	Record daily precipitation	80.5 mm (3.2 in)	66 of 100 (Major)
Mtn Dell Dam	United States	Record daily precipitation	44.2 mm (1.7 in)	66 of 100 (Major)
Cayuga Lock #1	United States	Record daily precipitation	72.4 mm (2.9 in)	65 of 100 (Major)
Banner Elk	United States	Record daily precipitation	123.2 mm (4.9 in)	65 of 100 (Major)
Altoona Blair Co AP	United States	Record daily precipitation	93.7 mm (3.7 in)	65 of 100 (Major)
New Harmony	United States	Record daily precipitation	112.5 mm (4.4 in)	64 of 100 (Major)
Strawberry Divide	United States	Record daily precipitation	66.0 mm (2.6 in)	64 of 100 (Major)
Lily Lake	United States	Record daily precipitation	58.4 mm (2.3 in)	63 of 100 (Major)
Bowie	United States	Record daily precipitation	63.5 mm (2.5 in)	62 of 100 (Major)
Clear Creek #1	United States	Record daily precipitation	63.5 mm (2.5 in)	62 of 100 (Major)
Long Creek	United States	Record daily precipitation	78.7 mm (3.1 in)	61 of 100 (Major)
Echo Dam	United States	Record daily precipitation	28.4 mm (1.1 in)	61 of 100 (Major)
Moroni	United States	Record daily precipitation	36.1 mm (1.4 in)	61 of 100 (Major)
Cottonwood Weir	United States	Record daily precipitation	36.6 mm (1.4 in)	60 of 100 (Major)
Vernon Creek	United States	Record daily precipitation	53.3 mm (2.1 in)	60 of 100 (Major)
Oconaluftee	United States	Record daily precipitation	81.3 mm (3.2 in)	59 of 100 (Notable)
Hogsett Rc Byrd Dam	United States	Record daily precipitation	79.8 mm (3.1 in)	59 of 100 (Notable)
Zanesville Muni AP	United States	Record daily precipitation	75.9 mm (3.0 in)	59 of 100 (Notable)
Skaneateles	United States	Record daily precipitation	84.8 mm (3.3 in)	58 of 100 (Notable)
Scipio	United States	Record daily precipitation	73.4 mm (2.9 in)	58 of 100 (Notable)
Blairsville Exp STN	United States	Record daily precipitation	100.8 mm (4.0 in)	57 of 100 (Notable)
Saltville 1N	United States	Record daily precipitation	47.0 mm (1.9 in)	57 of 100 (Notable)
Daniels-Strawberry	United States	Record daily precipitation	63.5 mm (2.5 in)	57 of 100 (Notable)
Roberts	Cayman Islands [United Kingdom]	Record daily precipitation	95.5 mm (3.8 in)	56 of 100 (Notable)
Provo Byu	United States	Record daily precipitation	42.9 mm (1.7 in)	56 of 100 (Notable)
Kolob	United States	Record daily precipitation	96.5 mm (3.8 in)	56 of 100 (Notable)
Bryce Canyon AP	United States	Record daily precipitation	42.9 mm (1.7 in)	56 of 100 (Notable)
Waterville 2	United States	Record daily precipitation	109.0 mm (4.3 in)	55 of 100 (Notable)
Williamsburg	United States	Record daily precipitation	87.4 mm (3.4 in)	55 of 100 (Notable)
Alta	United States	Record daily precipitation	43.9 mm (1.7 in)	55 of 100 (Notable)
Pennington Gap	United States	Record daily precipitation	58.4 mm (2.3 in)	55 of 100 (Notable)
Hewinta	United States	Record daily precipitation	43.2 mm (1.7 in)	55 of 100 (Notable)
Widtsoe #3	United States	Record daily precipitation	48.3 mm (1.9 in)	55 of 100 (Notable)
Boone 1 SE	United States	Record daily precipitation	129.5 mm (5.1 in)	54 of 100 (Notable)
Midway Valley	United States	Record daily precipitation	104.1 mm (4.1 in)	54 of 100 (Notable)
Carrollton	United States	Record daily precipitation	81.3 mm (3.2 in)	53 of 100 (Notable)
Adel	United States	Record low maximum temperature	8.3 C (46.9 F)	53 of 100 (Notable)
Holter Dam	United States	Record daily precipitation	28.2 mm (1.1 in)	53 of 100 (Notable)
Auburn	United States	Record daily precipitation	42.2 mm (1.7 in)	53 of 100 (Notable)
Pleasant Grove	United States	Record daily precipitation	29.5 mm (1.2 in)	53 of 100 (Notable)
Santaquin Chlorinator	United States	Record daily precipitation	36.3 mm (1.4 in)	53 of 100 (Notable)
Indian Canyon	United States	Record daily precipitation	35.6 mm (1.4 in)	53 of 100 (Notable)

Counts by Type and Timescale

1,118 records

Records set or tied on 18 August 2021 by type: Highest daily maximum 97, Lowest daily maximum 349, Highest daily minimum 185, Lowest daily minimum 60, Heaviest daily rainfall 427.

Records on 18 August 2021 by type
Record type	Records
Highest daily maximum	97
Lowest daily maximum	349
Highest daily minimum	185
Lowest daily minimum	60
Heaviest daily rainfall	427
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 18 August 2021 by timescale: all-time 18, monthly 60, daily 1,040.

How Much Records Were Beaten By

926 broken records

Margins by which the 926 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 124.2. Ties are not counted.

Top 20 by Significance

18 August 2021

Top 20 records on 18 August 2021 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 August 2021	Suhana, RU	all-time rain	99.1 mm (3.9 in)	42.9 mm (1.7 in)	79 years	91 of 100 (Exceptional)
18 August 2021	Delta, US	all-time rain	111.5 mm (4.4 in)	45.7 mm (1.8 in)	74 years	90 of 100 (Exceptional)
18 August 2021	Oak City, US	monthly rain	57.4 mm (2.3 in)	23.1 mm (0.9 in)	74 years	82 of 100 (Exceptional)
18 August 2021	Cullowhee, US	daily rain	77.7 mm (3.1 in)	45.9 mm (1.8 in)	100 years	80 of 100 (Exceptional)
18 August 2021	Tyler Pounds Fld, US	daily rain	120.7 mm (4.8 in)	87.7 mm (3.5 in)	118 years	80 of 100 (Exceptional)
18 August 2021	Hayden Fork, US	all-time rain	94.0 mm (3.7 in)	40.7 mm (1.6 in)	40 years	76 of 100 (Major)
18 August 2021	Kjobli I Snaasa, NO	daily rain	50.9 mm (2.0 in)	31.8 mm (1.3 in)	83 years	74 of 100 (Major)
18 August 2021	Cornelia, US	daily rain	149.1 mm (5.9 in)	73.4 mm (2.9 in)	82 years	74 of 100 (Major)
18 August 2021	Tooele, US	daily rain	29.2 mm (1.1 in)	18.3 mm (0.7 in)	108 years	74 of 100 (Major)
18 August 2021	Rock Creek, US	all-time rain	91.4 mm (3.6 in)	22.8 mm (0.9 in)	28 years	72 of 100 (Major)
18 August 2021	Tian-Shan, KG	daily rain	99.6 mm (3.9 in)	89.3 mm (3.5 in)	76 years	71 of 100 (Major)
18 August 2021	Lakefork #1, US	all-time rain	83.8 mm (3.3 in)	22.8 mm (0.9 in)	38 years	71 of 100 (Major)
18 August 2021	Elizabethton, US	daily rain	63.8 mm (2.5 in)	33.3 mm (1.3 in)	100 years	69 of 100 (Major)
18 August 2021	Elmira Corning Rgnl AP, US	daily rain	84.8 mm (3.3 in)	58.6 mm (2.3 in)	71 years	69 of 100 (Major)
18 August 2021	Dzalinda-1, RU	all-time rain	99.1 mm (3.9 in)	38.1 mm (1.5 in)	1 year	68 of 100 (Major)
18 August 2021	Cleveland, US	daily rain	131.1 mm (5.2 in)	84.6 mm (3.3 in)	71 years	68 of 100 (Major)
18 August 2021	Rome, US	daily rain	84.1 mm (3.3 in)	42.7 mm (1.7 in)	87 years	67 of 100 (Major)
18 August 2021	Highlands, US	daily rain	115.6 mm (4.6 in)	63.3 mm (2.5 in)	82 years	67 of 100 (Major)
18 August 2021	Waynesville 1 E, US	daily rain	80.5 mm (3.2 in)	35.8 mm (1.4 in)	82 years	66 of 100 (Major)
18 August 2021	Mtn Dell Dam, US	daily rain	44.2 mm (1.7 in)	32.5 mm (1.3 in)	56 years	66 of 100 (Major)

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 2021

Records set or tied on this calendar date in each year from 1797 to 2021. 2021 had 1,118 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 2021-08-18: 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	806
20 to 40	80
40 to 60	27
60 to 80	9
80 to 100	3
100 to 120	0
120 to 140	1