Weather Records on 20 August 1917

51 weather records were set or tied worldwide on 20 August 1917. Highest significance: Holbrook (Rsl), AU.

Key Facts for 20 August 1917

On 20 August 1917, 51 weather records were set or tied at long-record stations worldwide.
6 were record highs and 0 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 2 monthly and 49 daily.
Holbrook (Rsl) set a monthly record daily precipitation of 71.9 mm (2.8 in) on 20 August 1917.
Across 163 earlier years (1797 to 2026) the same calendar date averaged 457 records.

Record Map

51 stations

51 station records on 20 August 1917 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 August 1917: highest significance records shown on the map
Station	Country	Type	Value	Significance
Holbrook (Rsl)	Australia	Record daily precipitation	71.9 mm (2.8 in)	58 of 100 (Notable)
Lake Rowan (Bungeet)	Australia	Record daily precipitation	32.5 mm (1.3 in)	41 of 100 (Notable)
Young Post Office	Australia	Record daily precipitation	40.1 mm (1.6 in)	37 of 100 (Notable)
Tarcutta Post Office	Australia	Record daily precipitation	36.8 mm (1.4 in)	34 of 100 (Routine)
Mundoora	Australia	Record daily precipitation	30.5 mm (1.2 in)	32 of 100 (Routine)
Lugansk	Ukraine	Record daily precipitation	25.3 mm (1.0 in)	29 of 100 (Routine)
Wahgunyah	Australia	Record daily precipitation	30.2 mm (1.2 in)	27 of 100 (Routine)
Cape Borda Comparison	Australia	Record daily precipitation	27.4 mm (1.1 in)	25 of 100 (Routine)
Astrakan	Russia	Record daily precipitation	23.0 mm (0.9 in)	20 of 100 (Routine)
Narrandera Post Office	Australia	Record daily precipitation	23.6 mm (0.9 in)	20 of 100 (Routine)
Morangarell	Australia	Record daily precipitation	21.1 mm (0.8 in)	20 of 100 (Routine)
Fort Beaufort	South Africa	Record daily precipitation	11.7 mm (0.5 in)	20 of 100 (Routine)
Ida	South Africa	Record daily precipitation	13.0 mm (0.5 in)	20 of 100 (Routine)
Ellesmere	South Africa	Record daily precipitation	10.2 mm (0.4 in)	20 of 100 (Routine)
Whyte Yarcowie	Australia	Record daily precipitation	20.3 mm (0.8 in)	20 of 100 (Routine)
Warooka	Australia	Record daily precipitation	19.8 mm (0.8 in)	20 of 100 (Routine)
Katberg (Bos)	South Africa	Record daily precipitation	21.8 mm (0.9 in)	20 of 100 (Routine)
Robe Comparison	Australia	Record daily precipitation	13.2 mm (0.5 in)	20 of 100 (Routine)
Yorketown	Australia	Record daily precipitation	18.3 mm (0.7 in)	19 of 100 (Routine)
Cape Willoughby	Australia	Record daily precipitation	16.8 mm (0.7 in)	19 of 100 (Routine)
Kingscote	Australia	Record daily precipitation	8.4 mm (0.33 in)	19 of 100 (Routine)
Yardley Chase	South Africa	Record daily precipitation	6.9 mm (0.27 in)	19 of 100 (Routine)
Daly Waters	Australia	Record daily precipitation	0.5 mm (0.02 in)	17 of 100 (Routine)
Coulta	Australia	Record daily precipitation	13.0 mm (0.5 in)	17 of 100 (Routine)
Nairne	Australia	Record daily precipitation	31.5 mm (1.2 in)	17 of 100 (Routine)
Steynsburg	South Africa	Record daily precipitation	3.8 mm (0.15 in)	15 of 100 (Routine)
Aliwal North	South Africa	Record daily precipitation	5.8 mm (0.23 in)	15 of 100 (Routine)
Herschel	South Africa	Record daily precipitation	5.8 mm (0.23 in)	15 of 100 (Routine)
Bridgewater	Australia	Record daily precipitation	50.8 mm (2.0 in)	14 of 100 (Routine)
Casterton (Warrock)	Australia	Record daily precipitation	8.4 mm (0.33 in)	14 of 100 (Routine)
Somerset East	South Africa	Record daily precipitation	10.7 mm (0.4 in)	14 of 100 (Routine)
Lady Frere (Tnk)	South Africa	Record daily precipitation	10.2 mm (0.4 in)	14 of 100 (Routine)
Umzimkulu (Tnk)	South Africa	Record daily precipitation	6.6 mm (0.26 in)	14 of 100 (Routine)
Maly Uzen'	Russia	Record daily precipitation	6.0 mm (0.24 in)	12 of 100 (Routine)
Tulbagh (Pol)	South Africa	Record daily precipitation	6.9 mm (0.27 in)	12 of 100 (Routine)
Cullendale	South Africa	Record daily precipitation	14.0 mm (0.6 in)	12 of 100 (Routine)
Maitland (Weetulta)	Australia	Record daily precipitation	18.3 mm (0.7 in)	11 of 100 (Routine)
Jamestown	South Africa	Record daily precipitation	4.3 mm (0.17 in)	11 of 100 (Routine)
Umea	Sweden	Record high minimum temperature	13.5 C (56.3 F)	11 of 100 (Routine)
Kingston SE	Australia	Record daily precipitation	11.9 mm (0.5 in)	10 of 100 (Routine)
Warwick Post Office	Australia	Record daily precipitation	5.8 mm (0.23 in)	10 of 100 (Routine)
St. Petersburg	Russia	Record high maximum temperature	25.3 C (77.5 F)	10 of 100 (Routine)
Cathcart	South Africa	Record daily precipitation	2.5 mm (0.10 in)	7 of 100 (Routine)
Barkly East	South Africa	Record daily precipitation	5.6 mm (0.22 in)	7 of 100 (Routine)
Haparanda	Sweden	Record high minimum temperature	15.0 C (59.0 F)	7 of 100 (Routine)
Setauket Strong	United States	Record high maximum temperature	28.9 C (84.0 F)	7 of 100 (Routine)
Hallett	Australia	Record daily precipitation	9.7 mm (0.38 in)	6 of 100 (Routine)
Stansbury	Australia	Record daily precipitation	12.7 mm (0.5 in)	6 of 100 (Routine)
Brisbane Regional Office	Australia	Record high maximum temperature	26.2 C (79.2 F)	6 of 100 (Routine)
Anticosti West Point	Canada	Record daily precipitation	14.5 mm (0.6 in)	1 of 100 (Routine)
Houston Wb City	United States	Record high minimum temperature	25.0 C (77.0 F)	1 of 100 (Routine)

Counts by Type and Timescale

51 records

Records set or tied on 20 August 1917 by type: Highest daily maximum 3, Highest daily minimum 3, Heaviest daily rainfall 45.

Records on 20 August 1917 by type
Record type	Records
Highest daily maximum	3
Lowest daily maximum	0
Highest daily minimum	3
Lowest daily minimum	0
Heaviest daily rainfall	45
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 20 August 1917 by timescale: all-time 0, monthly 2, daily 49.

How Much Records Were Beaten By

49 broken records

Margins by which the 49 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 31.3. Ties are not counted.

Top 20 by Significance

20 August 1917

Top 20 records on 20 August 1917 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 August 1917	Holbrook (Rsl), AU	monthly rain	71.9 mm (2.8 in)	31.3 mm (1.2 in)	16 years	58 of 100 (Notable)
20 August 1917	Lake Rowan (Bungeet), AU	daily rain	32.5 mm (1.3 in)	23.4 mm (0.9 in)	4 years	41 of 100 (Notable)
20 August 1917	Young Post Office, AU	daily rain	40.1 mm (1.6 in)	17.0 mm (0.7 in)	30 years	37 of 100 (Notable)
20 August 1917	Tarcutta Post Office, AU	daily rain	36.8 mm (1.4 in)	13.9 mm (0.5 in)	30 years	34 of 100 (Routine)
20 August 1917	Mundoora, AU	monthly rain	30.5 mm (1.2 in)	7.9 mm (0.31 in)	12 years	32 of 100 (Routine)
20 August 1917	Lugansk, UA	daily rain	25.3 mm (1.0 in)	18.8 mm (0.7 in)	17 years	29 of 100 (Routine)
20 August 1917	Wahgunyah, AU	daily rain	30.2 mm (1.2 in)	8.9 mm (0.35 in)	30 years	27 of 100 (Routine)
20 August 1917	Cape Borda Comparison, AU	daily rain	27.4 mm (1.1 in)	10.1 mm (0.4 in)	4 years	25 of 100 (Routine)
20 August 1917	Astrakan, RU	daily rain	23.0 mm (0.9 in)	18.6 mm (0.7 in)	2 years	20 of 100 (Routine)
20 August 1917	Narrandera Post Office, AU	daily rain	23.6 mm (0.9 in)	8.9 mm (0.35 in)	30 years	20 of 100 (Routine)
20 August 1917	Morangarell, AU	daily rain	21.1 mm (0.8 in)	8.4 mm (0.33 in)	30 years	20 of 100 (Routine)
20 August 1917	Fort Beaufort, ZA	daily rain	11.7 mm (0.5 in)	8.1 mm (0.32 in)	29 years	20 of 100 (Routine)
20 August 1917	Ida, ZA	daily rain	13.0 mm (0.5 in)	12.2 mm (0.5 in)	23 years	20 of 100 (Routine)
20 August 1917	Ellesmere, ZA	daily rain	10.2 mm (0.4 in)	8.9 mm (0.35 in)	29 years	20 of 100 (Routine)
20 August 1917	Whyte Yarcowie, AU	daily rain	20.3 mm (0.8 in)	5.3 mm (0.21 in)	30 years	20 of 100 (Routine)
20 August 1917	Warooka, AU	daily rain	19.8 mm (0.8 in)	8.1 mm (0.32 in)	4 years	20 of 100 (Routine)
20 August 1917	Katberg (Bos), ZA	daily rain	21.8 mm (0.9 in)	14.2 mm (0.6 in)	12 years	20 of 100 (Routine)
20 August 1917	Robe Comparison, AU	daily rain	13.2 mm (0.5 in)	0.5 mm (0.02 in)	52 years	20 of 100 (Routine)
20 August 1917	Yorketown, AU	daily rain	18.3 mm (0.7 in)	7.1 mm (0.28 in)	4 years	19 of 100 (Routine)
20 August 1917	Cape Willoughby, AU	daily rain	16.8 mm (0.7 in)	6.4 mm (0.25 in)	4 years	19 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 1917

Records set or tied on this calendar date in each year from 1797 to 1917. 1917 had 51 records.

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

Records on 08-20 in each year
Year	Records
1797	1
1807	1
1809	2
1816	1
1830	1
1832	1
1838	1
1840	1
1842	1
1846	1
1849	1
1850	1
1852	1
1858	3
1863	5
1867	4
1870	3
1871	1
1873	1
1875	2
1877	1
1883	2
1884	2
1885	6
1886	1
1888	1
1889	2
1890	2
1891	2
1892	6
1893	1
1894	1
1895	1
1896	5
1897	6
1898	1
1899	5
1900	7
1901	12
1902	3
1903	7
1904	30
1905	7
1906	26
1907	15
1908	21
1909	69
1910	7
1911	18
1912	25
1913	23
1914	15
1915	14
1916	74
1917	51
1918	69
1919	25
1920	47
1921	23
1922	52
1923	83
1924	132
1925	193
1926	187
1927	338
1928	101
1929	213
1930	318
1931	214
1932	299
1933	324
1934	376
1935	339
1936	543
1937	537
1938	250
1939	448
1940	695
1941	230
1942	429
1943	436
1944	355
1945	398
1946	349
1947	988
1948	403
1949	431
1950	1,341
1951	824
1952	425
1953	441
1954	476
1955	848
1956	678
1957	342
1958	281
1959	764
1960	465
1961	520
1962	684
1963	577
1964	629
1965	470
1966	1,094
1967	657
1968	862
1969	608
1970	414
1971	585
1972	522
1973	490
1974	565
1975	411
1976	894
1977	860
1978	563
1979	1,009
1980	991
1981	856
1982	620
1983	1,465
1984	696
1985	666
1986	819
1987	564
1988	991
1989	603
1990	1,262
1991	804
1992	1,168
1993	759
1994	719
1995	1,113
1996	900
1997	1,214
1998	802
1999	810
2000	989
2001	909
2002	1,208
2003	1,031
2004	1,333
2005	1,112
2006	851
2007	1,955
2008	1,170
2009	1,414
2010	1,028
2011	987
2012	1,086
2013	545
2014	582
2015	1,075
2016	872
2017	324
2018	657
2019	698
2020	1,051
2021	1,028
2022	1,038
2023	1,479
2024	589
2025	1,134
2026	985

Download the Data

Data for records on 1917-08-20: 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	26
5 to 10	14
10 to 15	4
15 to 20	3
20 to 25	1
25 to 30	0
30 to 35	1