Weather Records on 18 August 1921

39 weather records were set or tied worldwide on 18 August 1921. Highest significance: Cape Willoughby, AU.

Key Facts for 18 August 1921

On 18 August 1921, 39 weather records were set or tied at long-record stations worldwide.
12 were record highs and 5 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 1 monthly and 38 daily.
Cape Willoughby set a monthly record daily precipitation of 33.0 mm (1.3 in) on 18 August 1921.
Across 171 earlier years (1797 to 2026) the same calendar date averaged 443 records.

Record Map

39 stations

39 station records on 18 August 1921 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 August 1921: highest significance records shown on the map
Station	Country	Type	Value	Significance
Cape Willoughby	Australia	Record daily precipitation	33.0 mm (1.3 in)	36 of 100 (Notable)
Hanover	United States	Record daily precipitation	37.6 mm (1.5 in)	27 of 100 (Routine)
Blue Hill Coop	United States	Record daily precipitation	39.1 mm (1.5 in)	26 of 100 (Routine)
Plymouth	United States	Record daily precipitation	41.1 mm (1.6 in)	26 of 100 (Routine)
Yarmouth	Canada	Record daily precipitation	36.8 mm (1.4 in)	22 of 100 (Routine)
Point Pleasant	United States	Record daily precipitation	20.3 mm (0.8 in)	20 of 100 (Routine)
Fergana	Uzbekistan	Record daily precipitation	1.2 mm (0.05 in)	19 of 100 (Routine)
Woodstock West	Australia	Record daily precipitation	9.7 mm (0.38 in)	18 of 100 (Routine)
Kiev	Ukraine	Record high minimum temperature	18.4 C (65.1 F)	16 of 100 (Routine)
Cape York Post Office	Australia	Record daily precipitation	3.0 mm (0.12 in)	14 of 100 (Routine)
Moreton Telegraph Station	Australia	Record daily precipitation	2.0 mm (0.08 in)	14 of 100 (Routine)
Urambie	Australia	Record daily precipitation	5.6 mm (0.22 in)	14 of 100 (Routine)
Tashkent	Uzbekistan	Record low minimum temperature	10.8 C (51.4 F)	14 of 100 (Routine)
Alice Springs Post Office	Australia	Record low minimum temperature	-1.1 C (30.0 F)	13 of 100 (Routine)
Gardiner	United States	Record daily precipitation	34.5 mm (1.4 in)	13 of 100 (Routine)
Tashkent	Uzbekistan	Record low maximum temperature	25.3 C (77.5 F)	13 of 100 (Routine)
Minimay (Booroopki)	Australia	Record daily precipitation	9.1 mm (0.36 in)	12 of 100 (Routine)
Pomonal Windy Ridge	Australia	Record daily precipitation	3.0 mm (0.12 in)	12 of 100 (Routine)
Kirov	Russia	Record high minimum temperature	15.6 C (60.1 F)	12 of 100 (Routine)
Syktyvkar	Russia	Record high minimum temperature	15.3 C (59.5 F)	11 of 100 (Routine)
Adelaide West Terrace	Australia	Record high maximum temperature	20.8 C (69.4 F)	10 of 100 (Routine)
Goornong	Australia	Record daily precipitation	3.8 mm (0.15 in)	10 of 100 (Routine)
Tarnagulla	Australia	Record daily precipitation	3.0 mm (0.12 in)	10 of 100 (Routine)
Simferopol	Ukraine	Record high minimum temperature	16.9 C (62.4 F)	10 of 100 (Routine)
Adrian 2 NNE	United States	Record daily precipitation	6.9 mm (0.27 in)	10 of 100 (Routine)
Rogersville 1 NE	United States	Record daily precipitation	35.6 mm (1.4 in)	8 of 100 (Routine)
Naracoorte	Australia	Record daily precipitation	8.4 mm (0.33 in)	7 of 100 (Routine)
Cet Central England	United Kingdom	Record high maximum temperature	23.9 C (75.0 F)	7 of 100 (Routine)
Sandy Cape Lighthouse	Australia	Record daily precipitation	21.3 mm (0.8 in)	6 of 100 (Routine)
Cottbus	Germany	Record low minimum temperature	8.8 C (47.8 F)	6 of 100 (Routine)
Sable Island	Canada	Record daily precipitation	17.8 mm (0.7 in)	5 of 100 (Routine)
Plymouth	United States	Record high minimum temperature	17.8 C (64.0 F)	4 of 100 (Routine)
Beeac (Eurack)	Australia	Record daily precipitation	8.9 mm (0.35 in)	3 of 100 (Routine)
Kristianstad	Sweden	Record low minimum temperature	5.0 C (41.0 F)	3 of 100 (Routine)
Camden 1	United States	Record high minimum temperature	24.4 C (75.9 F)	2 of 100 (Routine)
Pine Bluff	United States	Record high minimum temperature	24.4 C (75.9 F)	2 of 100 (Routine)
Batesville	United States	Record high minimum temperature	23.3 C (73.9 F)	2 of 100 (Routine)
Houston Wb City	United States	Record high minimum temperature	24.4 C (75.9 F)	2 of 100 (Routine)
Atlantic City Marina	United States	Record high maximum temperature	30.6 C (87.1 F)	2 of 100 (Routine)

Counts by Type and Timescale

39 records

Records set or tied on 18 August 1921 by type: Highest daily maximum 3, Lowest daily maximum 1, Highest daily minimum 9, Lowest daily minimum 4, Heaviest daily rainfall 22.

Records on 18 August 1921 by type
Record type	Records
Highest daily maximum	3
Lowest daily maximum	1
Highest daily minimum	9
Lowest daily minimum	4
Heaviest daily rainfall	22
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 18 August 1921 by timescale: all-time 0, monthly 1, daily 38.

How Much Records Were Beaten By

32 broken records

Margins by which the 32 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 21.8. Ties are not counted.

Top 20 by Significance

18 August 1921

Top 20 records on 18 August 1921 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 August 1921	Cape Willoughby, AU	monthly rain	33.0 mm (1.3 in)	5.3 mm (0.21 in)	33 years	36 of 100 (Notable)
18 August 1921	Hanover, US	daily rain	37.6 mm (1.5 in)	15.8 mm (0.6 in)	33 years	27 of 100 (Routine)
18 August 1921	Blue Hill Coop, US	daily rain	39.1 mm (1.5 in)	21.8 mm (0.9 in)	25 years	26 of 100 (Routine)
18 August 1921	Plymouth, US	daily rain	41.1 mm (1.6 in)	19.5 mm (0.8 in)	25 years	26 of 100 (Routine)
18 August 1921	Yarmouth, CA	daily rain	36.8 mm (1.4 in)	8.9 mm (0.35 in)	33 years	22 of 100 (Routine)
18 August 1921	Point Pleasant, US	daily rain	20.3 mm (0.8 in)	11.9 mm (0.5 in)	25 years	20 of 100 (Routine)
18 August 1921	Fergana, UZ	daily rain	1.2 mm (0.05 in)	1.2 mm (0.05 in)	39 years	19 of 100 (Routine)
18 August 1921	Woodstock West, AU	daily rain	9.7 mm (0.38 in)	3.1 mm (0.12 in)	34 years	18 of 100 (Routine)
18 August 1921	Kiev, UA	daily high min	18.4 C (65.1 F)	1.7 C (3.1 F)	23 years	16 of 100 (Routine)
18 August 1921	Cape York Post Office, AU	daily rain	3.0 mm (0.12 in)	0.7 mm (0.03 in)	27 years	14 of 100 (Routine)
18 August 1921	Moreton Telegraph Station, AU	daily rain	2.0 mm (0.08 in)	0.7 mm (0.03 in)	26 years	14 of 100 (Routine)
18 August 1921	Urambie, AU	daily rain	5.6 mm (0.22 in)	1.0 mm (0.04 in)	31 years	14 of 100 (Routine)
18 August 1921	Tashkent, UZ	daily low min	10.8 C (51.4 F)	0.8 C (1.4 F)	28 years	14 of 100 (Routine)
18 August 1921	Alice Springs Post Office, AU	daily low min	-1.1 C (30.0 F)	0.9 C (1.6 F)	24 years	13 of 100 (Routine)
18 August 1921	Gardiner, US	daily rain	34.5 mm (1.4 in)	0.7 mm (0.03 in)	33 years	13 of 100 (Routine)
18 August 1921	Tashkent, UZ	daily low max	25.3 C (77.5 F)	1.1 C (2.0 F)	22 years	13 of 100 (Routine)
18 August 1921	Minimay (Booroopki), AU	daily rain	9.1 mm (0.36 in)	4.0 mm (0.16 in)	4 years	12 of 100 (Routine)
18 August 1921	Pomonal Windy Ridge, AU	daily rain	3.0 mm (0.12 in)	1.5 mm (0.06 in)	29 years	12 of 100 (Routine)
18 August 1921	Kirov, RU	daily high min	15.6 C (60.1 F)	0.4 C (0.7 F)	26 years	12 of 100 (Routine)
18 August 1921	Syktyvkar, RU	daily high min	15.3 C (59.5 F)	2.0 C (3.6 F)	10 years	11 of 100 (Routine)

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 1921

Records set or tied on this calendar date in each year from 1797 to 1921. 1921 had 39 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 1921-08-18: 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 2026-10-15. Last revised 15 October 2026 (2026-10-15).

Margin	Records
0 to 5	25
5 to 10	3
10 to 15	1
15 to 20	2
20 to 25	1