Weather Records on 21 August 2018

816 weather records were set or tied worldwide on 21 August 2018. Highest significance: Nizamabad, IN.

Key Facts for 21 August 2018

On 21 August 2018, 816 weather records were set or tied at long-record stations worldwide.
343 were record highs and 278 were record lows, counting maximum and minimum temperature.
By timescale, 4 were all-time records, 12 monthly and 800 daily.
Nizamabad set a daily record precipitation of 117.1 mm (4.6 in) on 21 August 2018.
Across 165 earlier years (1800 to 2026) the same calendar date averaged 448 records.

Record Map

816 stations

816 station records on 21 August 2018 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 August 2018: highest significance records shown on the map
Station	Country	Type	Value	Significance
Nizamabad	India	Record daily precipitation	117.1 mm (4.6 in)	71 of 100 (Major)
Fillmore	United States	Record daily precipitation	39.1 mm (1.5 in)	71 of 100 (Major)
Charmany Farm	United States	Record daily precipitation	244.3 mm (9.6 in)	71 of 100 (Major)
Petrozawodsk	Russia	Record daily precipitation	54.1 mm (2.1 in)	69 of 100 (Major)
Poltavka	Russia	Record daily precipitation	61.0 mm (2.4 in)	68 of 100 (Major)
Idjevan	Armenia	Record daily precipitation	99.1 mm (3.9 in)	67 of 100 (Major)
Surat	India	Record daily precipitation	115.1 mm (4.5 in)	60 of 100 (Major)
Chatom	United States	Record daily precipitation	101.6 mm (4.0 in)	57 of 100 (Notable)
Oconomowoc Wwtp	United States	Record daily precipitation	76.2 mm (3.0 in)	55 of 100 (Notable)
Baggs	United States	Record daily precipitation	50.8 mm (2.0 in)	55 of 100 (Notable)
Big Rapids Wtp	United States	Record daily precipitation	50.5 mm (2.0 in)	51 of 100 (Notable)
Kanawha	United States	Record daily precipitation	76.7 mm (3.0 in)	50 of 100 (Notable)
Makaweli 965	United States	Record high maximum temperature	33.3 C (91.9 F)	50 of 100 (Notable)
Emeck	Russia	Record daily precipitation	34.0 mm (1.3 in)	49 of 100 (Notable)
Kokomo 3 WSW	United States	Record daily precipitation	119.6 mm (4.7 in)	49 of 100 (Notable)
Crescent City	United States	Record daily precipitation	81.3 mm (3.2 in)	48 of 100 (Notable)
Stoughton Wwtp	United States	Record daily precipitation	81.8 mm (3.2 in)	48 of 100 (Notable)
Olonec	Russia	Record daily precipitation	45.0 mm (1.8 in)	47 of 100 (Notable)
Billings Wtp	United States	Record low maximum temperature	15.0 C (59.0 F)	47 of 100 (Notable)
Big Timber	United States	Record low maximum temperature	13.9 C (57.0 F)	46 of 100 (Notable)
Rapelje	United States	Record low maximum temperature	11.7 C (53.1 F)	46 of 100 (Notable)
Thermopolis	United States	Record low maximum temperature	18.3 C (64.9 F)	46 of 100 (Notable)
Regensburg	Germany	Record high maximum temperature	33.6 C (92.5 F)	45 of 100 (Notable)
Watertown Wwtp	United States	Record daily precipitation	56.9 mm (2.2 in)	45 of 100 (Notable)
Medvezegorsk	Russia	Record daily precipitation	35.1 mm (1.4 in)	44 of 100 (Notable)
Vyborg	Russia	Record daily precipitation	29.8 mm (1.2 in)	44 of 100 (Notable)
Potosi 4 SW	United States	Record daily precipitation	39.9 mm (1.6 in)	44 of 100 (Notable)
Columbus	United States	Record low maximum temperature	13.3 C (55.9 F)	44 of 100 (Notable)
Red Lodge	United States	Record low maximum temperature	10.6 C (51.1 F)	44 of 100 (Notable)
Cuba City	United States	Record daily precipitation	35.6 mm (1.4 in)	44 of 100 (Notable)
Lodejnoe Pole	Russia	Record daily precipitation	33.0 mm (1.3 in)	43 of 100 (Notable)
Tara	Russia	Record daily precipitation	33.8 mm (1.3 in)	43 of 100 (Notable)
Flagler 1S	United States	Record low maximum temperature	18.9 C (66.0 F)	43 of 100 (Notable)
Hagerstown 1E	United States	Record daily precipitation	54.4 mm (2.1 in)	43 of 100 (Notable)
Ocate 2 NW	United States	Record daily precipitation	48.3 mm (1.9 in)	43 of 100 (Notable)
Astoria AP (Port of)	United States	Record high maximum temperature	30.0 C (86.0 F)	43 of 100 (Notable)
Clay Ctr	United States	Record low maximum temperature	22.8 C (73.0 F)	42 of 100 (Notable)
Leesville	United States	Record high minimum temperature	25.0 C (77.0 F)	42 of 100 (Notable)
La Rioja Aero.	Argentina	Record low minimum temperature	-7.5 C (18.5 F)	41 of 100 (Notable)
Algona	United States	Record daily precipitation	43.9 mm (1.7 in)	41 of 100 (Notable)
Richfield	United States	Record low minimum temperature	10.6 C (51.1 F)	41 of 100 (Notable)
Wallace	United States	Record low minimum temperature	7.2 C (45.0 F)	41 of 100 (Notable)
Lynch	United States	Record low maximum temperature	22.8 C (73.0 F)	41 of 100 (Notable)
Pine Creek	United States	Record daily precipitation	50.8 mm (2.0 in)	41 of 100 (Notable)
Turcasovo	Russia	Record daily precipitation	25.9 mm (1.0 in)	40 of 100 (Notable)
Vytegra	Russia	Record daily precipitation	28.5 mm (1.1 in)	40 of 100 (Notable)
Rockwell City	United States	Record daily precipitation	54.4 mm (2.1 in)	40 of 100 (Notable)
Jefferson 2 E	United States	Record daily precipitation	54.6 mm (2.1 in)	40 of 100 (Notable)
Zakatala	Azerbaijan	Record daily precipitation	99.1 mm (3.9 in)	39 of 100 (Notable)
Valentine	United States	Record low maximum temperature	15.0 C (59.0 F)	39 of 100 (Notable)
Elm Springs 3 ESE	United States	Record low maximum temperature	21.7 C (71.1 F)	39 of 100 (Notable)
Mirnyj	Russia	Record daily precipitation	26.0 mm (1.0 in)	38 of 100 (Notable)
Belknap Springs 8 N	United States	Record high minimum temperature	18.3 C (64.9 F)	38 of 100 (Notable)
Bradford Rgnl AP	United States	Record daily precipitation	59.2 mm (2.3 in)	38 of 100 (Notable)
Surat	India	Record low minimum temperature	22.4 C (72.3 F)	37 of 100 (Notable)
Ft Dodge 5NNW	United States	Record daily precipitation	71.1 mm (2.8 in)	37 of 100 (Notable)
Belle Fourche	United States	Record daily precipitation	36.3 mm (1.4 in)	37 of 100 (Notable)
Beaver Dam Wwtp	United States	Record daily precipitation	88.1 mm (3.5 in)	37 of 100 (Notable)
Petersburg 1	United States	Record high maximum temperature	24.4 C (75.9 F)	37 of 100 (Notable)
Hill City Muni AP	United States	Record low maximum temperature	21.7 C (71.1 F)	37 of 100 (Notable)

Counts by Type and Timescale

816 records

Records set or tied on 21 August 2018 by type: Highest daily maximum 92, Lowest daily maximum 159, Highest daily minimum 251, Lowest daily minimum 119, Heaviest daily rainfall 195.

Records on 21 August 2018 by type
Record type	Records
Highest daily maximum	92
Lowest daily maximum	159
Highest daily minimum	251
Lowest daily minimum	119
Heaviest daily rainfall	195
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 21 August 2018 by timescale: all-time 4, monthly 12, daily 800.

How Much Records Were Beaten By

630 broken records

Margins by which the 630 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 95.7. Ties are not counted.

Top 20 by Significance

21 August 2018

Top 20 records on 21 August 2018 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 August 2018	Nizamabad, IN	daily rain	117.1 mm (4.6 in)	83.1 mm (3.3 in)	72 years	71 of 100 (Major)
21 August 2018	Fillmore, US	daily rain	39.1 mm (1.5 in)	24.9 mm (1.0 in)	72 years	71 of 100 (Major)
21 August 2018	Charmany Farm, US	all-time rain	244.3 mm (9.6 in)	95.7 mm (3.8 in)	17 years	71 of 100 (Major)
21 August 2018	Petrozawodsk, RU	daily rain	54.1 mm (2.1 in)	29.6 mm (1.2 in)	72 years	69 of 100 (Major)
21 August 2018	Poltavka, RU	monthly rain	61.0 mm (2.4 in)	23.4 mm (0.9 in)	40 years	68 of 100 (Major)
21 August 2018	Idjevan, AM	daily rain	99.1 mm (3.9 in)	84.6 mm (3.3 in)	60 years	67 of 100 (Major)
21 August 2018	Surat, IN	daily rain	115.1 mm (4.5 in)	51.3 mm (2.0 in)	115 years	60 of 100 (Major)
21 August 2018	Chatom, US	daily rain	101.6 mm (4.0 in)	59.7 mm (2.4 in)	52 years	57 of 100 (Notable)
21 August 2018	Oconomowoc Wwtp, US	daily rain	76.2 mm (3.0 in)	39.4 mm (1.6 in)	52 years	55 of 100 (Notable)
21 August 2018	Baggs, US	monthly rain	50.8 mm (2.0 in)	19.0 mm (0.7 in)	19 years	55 of 100 (Notable)
21 August 2018	Big Rapids Wtp, US	daily rain	50.5 mm (2.0 in)	14.7 mm (0.6 in)	112 years	51 of 100 (Notable)
21 August 2018	Kanawha, US	daily rain	76.7 mm (3.0 in)	47.7 mm (1.9 in)	52 years	50 of 100 (Notable)
21 August 2018	Makaweli 965, US	daily high max	33.3 C (91.9 F)	1.1 C (2.0 F)	100 years	50 of 100 (Notable)
21 August 2018	Emeck, RU	daily rain	34.0 mm (1.3 in)	22.2 mm (0.9 in)	44 years	49 of 100 (Notable)
21 August 2018	Kokomo 3 WSW, US	monthly rain	119.6 mm (4.7 in)	29.2 mm (1.1 in)	35 years	49 of 100 (Notable)
21 August 2018	Crescent City, US	daily rain	81.3 mm (3.2 in)	30.5 mm (1.2 in)	60 years	48 of 100 (Notable)
21 August 2018	Stoughton Wwtp, US	daily rain	81.8 mm (3.2 in)	33.5 mm (1.3 in)	53 years	48 of 100 (Notable)
21 August 2018	Olonec, RU	daily rain	45.0 mm (1.8 in)	18.7 mm (0.7 in)	56 years	47 of 100 (Notable)
21 August 2018	Billings Wtp, US	daily low max	15.0 C (59.0 F)	3.3 C (5.9 F)	100 years	47 of 100 (Notable)
21 August 2018	Big Timber, US	daily low max	13.9 C (57.0 F)	2.8 C (5.0 F)	105 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

1800 to 2018

Records set or tied on this calendar date in each year from 1800 to 2018. 2018 had 816 records.

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

Records on 08-21 in each year
Year	Records
1800	1
1802	1
1804	1
1807	1
1816	1
1818	1
1832	1
1834	1
1839	3
1843	1
1847	1
1849	3
1850	1
1851	2
1863	1
1866	1
1867	2
1870	3
1871	2
1872	1
1873	1
1876	1
1877	2
1879	2
1884	2
1885	5
1886	1
1887	5
1888	2
1889	3
1890	4
1891	2
1893	4
1894	8
1895	3
1896	2
1897	4
1898	4
1899	7
1900	4
1901	9
1902	8
1903	6
1904	8
1905	4
1906	22
1907	20
1908	13
1909	17
1910	33
1911	19
1912	50
1913	37
1914	24
1915	21
1916	106
1917	101
1918	202
1919	19
1920	59
1921	34
1922	58
1923	111
1924	135
1925	220
1926	227
1927	228
1928	110
1929	234
1930	297
1931	277
1932	264
1933	328
1934	320
1935	318
1936	807
1937	762
1938	239
1939	630
1940	683
1941	180
1942	415
1943	438
1944	346
1945	544
1946	390
1947	954
1948	305
1949	508
1950	958
1951	699
1952	368
1953	331
1954	497
1955	885
1956	701
1957	490
1958	389
1959	704
1960	490
1961	644
1962	469
1963	338
1964	794
1965	455
1966	661
1967	541
1968	1,014
1969	650
1970	373
1971	660
1972	441
1973	438
1974	564
1975	545
1976	756
1977	764
1978	445
1979	778
1980	904
1981	1,015
1982	769
1983	1,407
1984	975
1985	623
1986	1,166
1987	740
1988	889
1989	828
1990	910
1991	828
1992	957
1993	698
1994	968
1995	962
1996	950
1997	1,291
1998	948
1999	717
2000	861
2001	797
2002	965
2003	1,241
2004	1,585
2005	1,071
2006	797
2007	1,829
2008	1,012
2009	1,319
2010	1,155
2011	1,022
2012	990
2013	513
2014	624
2015	651
2016	890
2017	347
2018	816
2019	631
2020	1,147
2021	767
2022	917
2023	1,826
2024	777
2025	1,230
2026	1,290

Download the Data

Data for records on 2018-08-21: 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-13. Last revised 13 October 2026 (2026-10-13).

Margin	Records
0 to 20	600
20 to 40	24
40 to 60	3
60 to 80	0
80 to 100	3