Weather Records on 20 October 1917

201 weather records were set or tied worldwide on 20 October 1917. Highest significance: Botany No.1 Dam, AU.

Key Facts for 20 October 1917

On 20 October 1917, 201 weather records were set or tied at long-record stations worldwide.
4 were record highs and 8 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 5 monthly and 196 daily.
Botany No.1 Dam set a daily record precipitation of 75.4 mm (3.0 in) on 20 October 1917.
Across 160 earlier years (1806 to 2025) the same calendar date averaged 459 records.

Record Map

201 stations

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

Weather records on 20 October 1917: highest significance records shown on the map
Station	Country	Type	Value	Significance
Botany No.1 Dam	Australia	Record daily precipitation	75.4 mm (3.0 in)	51 of 100 (Notable)
Cornalla	Australia	Record daily precipitation	40.4 mm (1.6 in)	51 of 100 (Notable)
Mornington	Australia	Record daily precipitation	34.5 mm (1.4 in)	51 of 100 (Notable)
Bute (Ninnes)	Australia	Record daily precipitation	29.7 mm (1.2 in)	49 of 100 (Notable)
Portland	Australia	Record daily precipitation	28.4 mm (1.1 in)	48 of 100 (Notable)
Port Pirie (Valencia)	Australia	Record daily precipitation	33.3 mm (1.3 in)	45 of 100 (Notable)
Mount Gambier Post Office	Australia	Record daily precipitation	29.2 mm (1.1 in)	45 of 100 (Notable)
Farrell Flat	Australia	Record daily precipitation	27.7 mm (1.1 in)	44 of 100 (Notable)
Port Fairy (Griffiths Island)	Australia	Record daily precipitation	27.2 mm (1.1 in)	44 of 100 (Notable)
Yacka	Australia	Record daily precipitation	30.5 mm (1.2 in)	42 of 100 (Notable)
Burra (Poonunda)	Australia	Record daily precipitation	30.2 mm (1.2 in)	40 of 100 (Notable)
Beachport	Australia	Record daily precipitation	27.9 mm (1.1 in)	40 of 100 (Notable)
Mortlake	Australia	Record daily precipitation	30.7 mm (1.2 in)	40 of 100 (Notable)
Auburn	Australia	Record daily precipitation	25.7 mm (1.0 in)	35 of 100 (Notable)
Port Pirie Nyrstar Comparison	Australia	Record daily precipitation	34.5 mm (1.4 in)	35 of 100 (Notable)
Hastings Post Office	Australia	Record daily precipitation	38.4 mm (1.5 in)	32 of 100 (Routine)
Wandearah North	Australia	Record daily precipitation	26.4 mm (1.0 in)	31 of 100 (Routine)
Robe Comparison	Australia	Record daily precipitation	28.2 mm (1.1 in)	31 of 100 (Routine)
Hallett (Old Canowie)	Australia	Record daily precipitation	28.4 mm (1.1 in)	29 of 100 (Routine)
Mandamar	Australia	Record daily precipitation	25.9 mm (1.0 in)	29 of 100 (Routine)
Charlottetown	Canada	Record daily precipitation	42.2 mm (1.7 in)	29 of 100 (Routine)
Carabost	Australia	Record daily precipitation	43.4 mm (1.7 in)	27 of 100 (Routine)
Wunnamurra	Australia	Record daily precipitation	37.1 mm (1.5 in)	27 of 100 (Routine)
The Olives	Australia	Record daily precipitation	37.6 mm (1.5 in)	27 of 100 (Routine)
Bundaleer Forest Reserve	Australia	Record daily precipitation	35.6 mm (1.4 in)	25 of 100 (Routine)
Crystal Brook	Australia	Record daily precipitation	31.8 mm (1.3 in)	25 of 100 (Routine)
Hallett	Australia	Record daily precipitation	27.4 mm (1.1 in)	24 of 100 (Routine)
Laura	Australia	Record daily precipitation	27.9 mm (1.1 in)	24 of 100 (Routine)
Barnawartha	Australia	Record daily precipitation	37.8 mm (1.5 in)	24 of 100 (Routine)
Washington	United States	Record low maximum temperature	9.4 C (48.9 F)	23 of 100 (Routine)
Gladstone	Australia	Record daily precipitation	40.6 mm (1.6 in)	22 of 100 (Routine)
Narridy Post Office	Australia	Record daily precipitation	27.9 mm (1.1 in)	22 of 100 (Routine)
Whyte Yarcowie	Australia	Record daily precipitation	28.4 mm (1.1 in)	22 of 100 (Routine)
Mannanarie Post Office	Australia	Record daily precipitation	35.3 mm (1.4 in)	21 of 100 (Routine)
Yarmouth	Canada	Record daily precipitation	54.4 mm (2.1 in)	21 of 100 (Routine)
Cape Willoughby	Australia	Record daily precipitation	20.3 mm (0.8 in)	20 of 100 (Routine)
Burra (Kooringa)	Australia	Record daily precipitation	24.1 mm (0.9 in)	20 of 100 (Routine)
Saddleworth	Australia	Record daily precipitation	22.9 mm (0.9 in)	20 of 100 (Routine)
Kanmantoo	Australia	Record daily precipitation	22.6 mm (0.9 in)	20 of 100 (Routine)
Canary Island	Australia	Record daily precipitation	24.6 mm (1.0 in)	20 of 100 (Routine)
Marrabel	Australia	Record daily precipitation	19.6 mm (0.8 in)	20 of 100 (Routine)
Cape Northumberland	Australia	Record daily precipitation	20.1 mm (0.8 in)	20 of 100 (Routine)
Truro	Australia	Record daily precipitation	22.1 mm (0.9 in)	20 of 100 (Routine)
Paskeville	Australia	Record daily precipitation	18.0 mm (0.7 in)	20 of 100 (Routine)
Warrnambool Shire Office	Australia	Record daily precipitation	20.8 mm (0.8 in)	20 of 100 (Routine)
Tarlee	Australia	Record daily precipitation	15.2 mm (0.6 in)	20 of 100 (Routine)
Curnomona (Curnamona)	Australia	Record daily precipitation	16.0 mm (0.6 in)	20 of 100 (Routine)
Brinkworth (Bungaree)	Australia	Record daily precipitation	22.6 mm (0.9 in)	20 of 100 (Routine)
Woolsthorpe	Australia	Record daily precipitation	21.3 mm (0.8 in)	20 of 100 (Routine)
Callington	Australia	Record daily precipitation	15.5 mm (0.6 in)	20 of 100 (Routine)
Newlyn Reservoir	Australia	Record daily precipitation	21.3 mm (0.8 in)	20 of 100 (Routine)
Kadina	Australia	Record daily precipitation	11.2 mm (0.4 in)	20 of 100 (Routine)
Kapunda Water Works	Australia	Record daily precipitation	15.5 mm (0.6 in)	20 of 100 (Routine)
Coonalpyn	Australia	Record daily precipitation	17.8 mm (0.7 in)	20 of 100 (Routine)
Kapunda	Australia	Record daily precipitation	16.5 mm (0.6 in)	20 of 100 (Routine)
Overland Corner	Australia	Record daily precipitation	12.7 mm (0.5 in)	20 of 100 (Routine)
Balaklava	Australia	Record daily precipitation	13.2 mm (0.5 in)	20 of 100 (Routine)
White Cliffs (Tongo)	Australia	Record daily precipitation	16.5 mm (0.6 in)	20 of 100 (Routine)
Seymour Shire Depot	Australia	Record daily precipitation	21.3 mm (0.8 in)	20 of 100 (Routine)
Cape Otway Lighthouse	Australia	Record daily precipitation	22.9 mm (0.9 in)	20 of 100 (Routine)

Counts by Type and Timescale

201 records

Records set or tied on 20 October 1917 by type: Highest daily maximum 2, Lowest daily maximum 5, Highest daily minimum 2, Lowest daily minimum 3, Heaviest daily rainfall 187, Heaviest daily snowfall 2.

Records on 20 October 1917 by type
Record type	Records
Highest daily maximum	2
Lowest daily maximum	5
Highest daily minimum	2
Lowest daily minimum	3
Heaviest daily rainfall	187
Heaviest daily snowfall	2
Deepest snow cover	0

Records on 20 October 1917 by timescale: all-time 0, monthly 5, daily 196.

How Much Records Were Beaten By

195 broken records

Margins by which the 195 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 61.2. Ties are not counted.

Top 20 by Significance

20 October 1917

Top 20 records on 20 October 1917 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 October 1917	Botany No.1 Dam, AU	daily rain	75.4 mm (3.0 in)	61.2 mm (2.4 in)	35 years	51 of 100 (Notable)
20 October 1917	Cornalla, AU	daily rain	40.4 mm (1.6 in)	33.3 mm (1.3 in)	34 years	51 of 100 (Notable)
20 October 1917	Mornington, AU	daily rain	34.5 mm (1.4 in)	24.1 mm (0.9 in)	42 years	51 of 100 (Notable)
20 October 1917	Bute (Ninnes), AU	daily rain	29.7 mm (1.2 in)	23.6 mm (0.9 in)	30 years	49 of 100 (Notable)
20 October 1917	Portland, AU	daily rain	28.4 mm (1.1 in)	17.0 mm (0.7 in)	41 years	48 of 100 (Notable)
20 October 1917	Port Pirie (Valencia), AU	daily rain	33.3 mm (1.3 in)	24.9 mm (1.0 in)	12 years	45 of 100 (Notable)
20 October 1917	Mount Gambier Post Office, AU	daily rain	29.2 mm (1.1 in)	18.8 mm (0.7 in)	14 years	45 of 100 (Notable)
20 October 1917	Farrell Flat, AU	daily rain	27.7 mm (1.1 in)	23.1 mm (0.9 in)	12 years	44 of 100 (Notable)
20 October 1917	Port Fairy (Griffiths Island), AU	daily rain	27.2 mm (1.1 in)	21.1 mm (0.8 in)	19 years	44 of 100 (Notable)
20 October 1917	Yacka, AU	daily rain	30.5 mm (1.2 in)	24.7 mm (1.0 in)	12 years	42 of 100 (Notable)
20 October 1917	Burra (Poonunda), AU	daily rain	30.2 mm (1.2 in)	27.4 mm (1.1 in)	12 years	40 of 100 (Notable)
20 October 1917	Beachport, AU	daily rain	27.9 mm (1.1 in)	15.7 mm (0.6 in)	14 years	40 of 100 (Notable)
20 October 1917	Mortlake, AU	daily rain	30.7 mm (1.2 in)	15.5 mm (0.6 in)	36 years	40 of 100 (Notable)
20 October 1917	Auburn, AU	daily rain	25.7 mm (1.0 in)	15.8 mm (0.6 in)	30 years	35 of 100 (Notable)
20 October 1917	Port Pirie Nyrstar Comparison, AU	daily rain	34.5 mm (1.4 in)	21.8 mm (0.9 in)	12 years	35 of 100 (Notable)
20 October 1917	Hastings Post Office, AU	monthly rain	38.4 mm (1.5 in)	3.9 mm (0.15 in)	42 years	32 of 100 (Routine)
20 October 1917	Wandearah North, AU	daily rain	26.4 mm (1.0 in)	18.8 mm (0.7 in)	12 years	31 of 100 (Routine)
20 October 1917	Robe Comparison, AU	monthly rain	28.2 mm (1.1 in)	2.5 mm (0.10 in)	36 years	31 of 100 (Routine)
20 October 1917	Hallett (Old Canowie), AU	daily rain	28.4 mm (1.1 in)	17.0 mm (0.7 in)	12 years	29 of 100 (Routine)
20 October 1917	Mandamar, AU	daily rain	25.9 mm (1.0 in)	14.5 mm (0.6 in)	27 years	29 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

1806 to 1917

Records set or tied on this calendar date in each year from 1806 to 1917. 1917 had 201 records.

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

Records on 10-20 in each year
Year	Records
1806	1
1835	1
1844	1
1846	1
1847	2
1851	1
1852	1
1858	1
1863	2
1864	2
1866	3
1867	1
1868	2
1872	2
1874	2
1875	3
1876	2
1877	1
1878	1
1880	3
1881	2
1884	1
1885	1
1886	1
1887	1
1888	6
1891	4
1892	4
1893	1
1894	3
1895	4
1896	9
1897	2
1898	7
1899	1
1900	8
1901	7
1902	5
1903	9
1904	13
1905	22
1906	28
1907	32
1908	26
1909	17
1910	31
1911	16
1912	6
1913	38
1914	16
1915	20
1916	72
1917	201
1918	34
1919	19
1920	81
1921	68
1922	83
1923	96
1924	182
1925	247
1926	147
1927	283
1928	92
1929	129
1930	672
1931	125
1932	331
1933	675
1934	422
1935	390
1936	370
1937	189
1938	231
1939	367
1940	757
1941	459
1942	152
1943	501
1944	288
1945	363
1946	310
1947	1,494
1948	320
1949	1,084
1950	619
1951	279
1952	520
1953	1,057
1954	262
1955	529
1956	283
1957	440
1958	461
1959	451
1960	671
1961	479
1962	733
1963	765
1964	598
1965	340
1966	857
1967	511
1968	244
1969	607
1970	710
1971	606
1972	1,724
1973	878
1974	1,122
1975	587
1976	1,304
1977	467
1978	508
1979	1,647
1980	350
1981	1,083
1982	1,191
1983	944
1984	1,562
1985	835
1986	823
1987	590
1988	737
1989	2,092
1990	609
1991	971
1992	1,174
1993	1,238
1994	650
1995	703
1996	1,417
1997	949
1998	683
1999	603
2000	737
2001	589
2002	985
2003	1,761
2004	1,861
2005	1,092
2006	1,170
2007	923
2008	477
2009	786
2010	539
2011	785
2012	945
2013	592
2014	851
2015	523
2016	947
2017	602
2018	394
2019	744
2020	1,010
2021	900
2022	834
2023	1,468
2024	707
2025	326

Download the Data

Data for records on 1917-10-20: 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 10	130
10 to 20	51
20 to 30	12
30 to 40	1
40 to 50	0
50 to 60	0
60 to 70	1