Weather Records on 31 October 1917

67 weather records were set or tied worldwide on 31 October 1917. Highest significance: Parry Sound, CA.

Key Facts for 31 October 1917

On 31 October 1917, 67 weather records were set or tied at long-record stations worldwide.
7 were record highs and 40 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 20 monthly and 47 daily.
Parry Sound set a monthly record daily snowfall of 15.2 cm (6.0 in) on 31 October 1917.
Across 163 earlier years (1805 to 2025) the same calendar date averaged 474 records.

Record Map

67 stations

67 station records on 31 October 1917 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 31 October 1917: highest significance records shown on the map
Station	Country	Type	Value	Significance
Parry Sound	Canada	Record daily snowfall	15.2 cm (6.0 in)	65 of 100 (Major)
Haliburton A	Canada	Record daily snowfall	25.4 cm (10.0 in)	60 of 100 (Major)
Cottam	Canada	Record daily snowfall	7.6 cm (3.0 in)	31 of 100 (Routine)
Stratford	Canada	Record low maximum temperature	-1.7 C (28.9 F)	30 of 100 (Routine)
World Trade Ctr	United States	Record low minimum temperature	-1.7 C (28.9 F)	28 of 100 (Routine)
Atlantic City Marina	United States	Record low maximum temperature	5.6 C (42.1 F)	26 of 100 (Routine)
Hambantota	Sri Lanka	Record low minimum temperature	20.2 C (68.4 F)	24 of 100 (Routine)
State College	United States	Record low maximum temperature	1.1 C (34.0 F)	24 of 100 (Routine)
Beatrice	Canada	Record daily snowfall	8.9 cm (3.5 in)	23 of 100 (Routine)
Morden	Canada	Record daily snowfall	14.0 cm (5.5 in)	21 of 100 (Routine)
Guelph Oac	Canada	Record low maximum temperature	-1.1 C (30.0 F)	21 of 100 (Routine)
Chattanooga Wb City	United States	Record low minimum temperature	-3.3 C (26.1 F)	21 of 100 (Routine)
Kingston Queens U	Canada	Record daily snowfall	2.8 cm (1.1 in)	20 of 100 (Routine)
Cumberland Station	Australia	Record daily precipitation	9.1 mm (0.36 in)	20 of 100 (Routine)
Cardwell Marine Pde	Australia	Record daily precipitation	40.9 mm (1.6 in)	20 of 100 (Routine)
Lucknow	Canada	Record low maximum temperature	-1.1 C (30.0 F)	20 of 100 (Routine)
Port Dover	Canada	Record daily snowfall	4.8 cm (1.9 in)	20 of 100 (Routine)
Kvikkjokk-Arrenjarka	Sweden	Record daily precipitation	20.0 mm (0.8 in)	20 of 100 (Routine)
Madison Wb City	United States	Record low minimum temperature	-8.3 C (17.1 F)	20 of 100 (Routine)
Saint John	Canada	Record high maximum temperature	17.2 C (63.0 F)	19 of 100 (Routine)
Milwaukee Wb City	United States	Record low maximum temperature	-1.1 C (30.0 F)	19 of 100 (Routine)
Philadelphia City	United States	Record low maximum temperature	6.1 C (43.0 F)	19 of 100 (Routine)
St Lawrence Post Office	Australia	Record daily precipitation	3.0 mm (0.12 in)	18 of 100 (Routine)
Middletown 4 W	United States	Record daily precipitation	33.0 mm (1.3 in)	18 of 100 (Routine)
Sydney	Canada	Record high maximum temperature	16.7 C (62.1 F)	17 of 100 (Routine)
Buffalo	United States	Record daily precipitation	17.0 mm (0.7 in)	17 of 100 (Routine)
Buffalo	United States	Record daily snowfall	10.2 cm (4.0 in)	17 of 100 (Routine)
Madison Wb City	United States	Record low maximum temperature	-1.1 C (30.0 F)	17 of 100 (Routine)
Milwaukee Wb City	United States	Record low minimum temperature	-6.7 C (19.9 F)	17 of 100 (Routine)
Washington	United States	Record low maximum temperature	6.7 C (44.1 F)	17 of 100 (Routine)
Pointe Au Pere	Canada	Record high maximum temperature	12.2 C (54.0 F)	16 of 100 (Routine)
Ilulissat (Jakobshavn)	Greenland [Denmark]	Record low minimum temperature	-21.3 C (-6.3 F)	16 of 100 (Routine)
Arnsberg	Germany	Record snow depth	2.0 cm (0.8 in)	16 of 100 (Routine)
Wagga Wagga (Kooringal)	Australia	Record low minimum temperature	2.8 C (37.0 F)	15 of 100 (Routine)
Aleksandrovsk-Sahalinskij	Russia	Record daily precipitation	13.0 mm (0.5 in)	15 of 100 (Routine)
Olympia Priest Pt Park	United States	Record high maximum temperature	19.4 C (66.9 F)	15 of 100 (Routine)
Baltimore Customs House	United States	Record low maximum temperature	6.1 C (43.0 F)	15 of 100 (Routine)
Dubuque River	United States	Record low maximum temperature	0.6 C (33.1 F)	15 of 100 (Routine)
Dubuque River	United States	Record snow depth	2.5 cm (1.0 in)	15 of 100 (Routine)
New Westminster	Canada	Record high maximum temperature	17.2 C (63.0 F)	13 of 100 (Routine)
Morden	Canada	Record daily precipitation	14.0 mm (0.6 in)	13 of 100 (Routine)
Little Rock St Capitol	United States	Record low minimum temperature	-0.6 C (30.9 F)	13 of 100 (Routine)
Morris W Cntrl Rsch & Outreach	United States	Record low minimum temperature	-10.0 C (14.0 F)	12 of 100 (Routine)
Setauket Strong	United States	Record low minimum temperature	0.0 C (32.0 F)	12 of 100 (Routine)
Toronto	Canada	Record low maximum temperature	1.1 C (34.0 F)	11 of 100 (Routine)
Vineland	United States	Record low maximum temperature	5.6 C (42.1 F)	11 of 100 (Routine)
Haliburton A	Canada	Record daily precipitation	25.4 mm (1.0 in)	10 of 100 (Routine)
Alice Springs Post Office	Australia	Record low minimum temperature	9.4 C (48.9 F)	9 of 100 (Routine)
Charlottetown	Canada	Record high maximum temperature	17.2 C (63.0 F)	9 of 100 (Routine)
Barrie	Canada	Record low maximum temperature	0.0 C (32.0 F)	8 of 100 (Routine)
Hamilton	Canada	Record low maximum temperature	1.7 C (35.1 F)	7 of 100 (Routine)
Wilmington Wb City	United States	Record low minimum temperature	0.6 C (33.1 F)	7 of 100 (Routine)
Green Bay	United States	Record low minimum temperature	-7.8 C (18.0 F)	7 of 100 (Routine)
Dubuque River	United States	Record low minimum temperature	-6.7 C (19.9 F)	7 of 100 (Routine)
Washington	United States	Record low minimum temperature	-3.3 C (26.1 F)	7 of 100 (Routine)
Cape May 2 NW	United States	Record low maximum temperature	6.7 C (44.1 F)	6 of 100 (Routine)
Toledo Blade	United States	Record low maximum temperature	3.3 C (37.9 F)	6 of 100 (Routine)
Atlantic City Marina	United States	Record low minimum temperature	-1.7 C (28.9 F)	6 of 100 (Routine)
Baltimore Customs House	United States	Record low minimum temperature	-1.1 C (30.0 F)	6 of 100 (Routine)
Green Bay	United States	Record low maximum temperature	0.0 C (32.0 F)	6 of 100 (Routine)

Counts by Type and Timescale

67 records

Records set or tied on 31 October 1917 by type: Highest daily maximum 7, Lowest daily maximum 20, Lowest daily minimum 20, Heaviest daily rainfall 10, Heaviest daily snowfall 8, Deepest snow cover 2.

Records on 31 October 1917 by type
Record type	Records
Highest daily maximum	7
Lowest daily maximum	20
Highest daily minimum	0
Lowest daily minimum	20
Heaviest daily rainfall	10
Heaviest daily snowfall	8
Deepest snow cover	2

Records on 31 October 1917 by timescale: all-time 0, monthly 20, daily 47.

How Much Records Were Beaten By

55 broken records

Margins by which the 55 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 203.0. Ties are not counted.

Top 20 by Significance

31 October 1917

Top 20 records on 31 October 1917 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
31 October 1917	Parry Sound, CA	monthly snowfall	15.2 cm (6.0 in)	8.1 cm (3.2 in)	37 years	65 of 100 (Major)
31 October 1917	Haliburton A, CA	monthly snowfall	25.4 cm (10.0 in)	20.3 cm (8.0 in)	24 years	60 of 100 (Major)
31 October 1917	Cottam, CA	monthly snowfall	7.6 cm (3.0 in)	6.3 cm (2.5 in)	22 years	31 of 100 (Routine)
31 October 1917	Stratford, CA	monthly low max	-1.7 C (28.9 F)	0.6 C (1.1 F)	48 years	30 of 100 (Routine)
31 October 1917	World Trade Ctr, US	monthly low min	-1.7 C (28.9 F)	1.1 C (2.0 F)	41 years	28 of 100 (Routine)
31 October 1917	Atlantic City Marina, US	monthly low max	5.6 C (42.1 F)	0.5 C (0.9 F)	38 years	26 of 100 (Routine)
31 October 1917	Hambantota, LK	monthly low min	20.2 C (68.4 F)	0.4 C (0.7 F)	23 years	24 of 100 (Routine)
31 October 1917	State College, US	monthly low max	1.1 C (34.0 F)	2.2 C (4.0 F)	24 years	24 of 100 (Routine)
31 October 1917	Beatrice, CA	daily snowfall	8.9 cm (3.5 in)	7.6 cm (3.0 in)	26 years	23 of 100 (Routine)
31 October 1917	Morden, CA	monthly snowfall	14.0 cm (5.5 in)	1.3 cm (0.5 in)	23 years	21 of 100 (Routine)
31 October 1917	Guelph Oac, CA	monthly low max	-1.1 C (30.0 F)	1.1 C (2.0 F)	24 years	21 of 100 (Routine)
31 October 1917	Chattanooga Wb City, US	monthly low min	-3.3 C (26.1 F)	0.5 C (0.9 F)	23 years	21 of 100 (Routine)
31 October 1917	Kingston Queens U, CA	daily snowfall	2.8 cm (1.1 in)	2.8 cm (1.1 in)	44 years	20 of 100 (Routine)
31 October 1917	Cumberland Station, AU	daily rain	9.1 mm (0.36 in)	9.1 mm (0.36 in)	28 years	20 of 100 (Routine)
31 October 1917	Cardwell Marine Pde, AU	daily rain	40.9 mm (1.6 in)	19.8 mm (0.8 in)	3 years	20 of 100 (Routine)
31 October 1917	Lucknow, CA	monthly low max	-1.1 C (30.0 F)	1.7 C (3.1 F)	19 years	20 of 100 (Routine)
31 October 1917	Port Dover, CA	daily snowfall	4.8 cm (1.9 in)	2.3 cm (0.9 in)	41 years	20 of 100 (Routine)
31 October 1917	Kvikkjokk-Arrenjarka, SE	daily rain	20.0 mm (0.8 in)	7.1 mm (0.28 in)	0 years	20 of 100 (Routine)
31 October 1917	Madison Wb City, US	daily low min	-8.3 C (17.1 F)	1.6 C (2.9 F)	43 years	20 of 100 (Routine)
31 October 1917	Saint John, CA	daily high max	17.2 C (63.0 F)	3.3 C (5.9 F)	22 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

1805 to 1917

Records set or tied on this calendar date in each year from 1805 to 1917. 1917 had 67 records.

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

Records on 10-31 in each year
Year	Records
1805	1
1811	2
1828	1
1836	1
1838	1
1839	1
1841	1
1845	1
1847	2
1848	1
1852	2
1856	1
1865	1
1868	1
1869	3
1873	2
1875	2
1876	1
1877	1
1878	1
1879	1
1880	1
1881	6
1883	1
1884	3
1886	1
1887	2
1888	3
1889	5
1891	3
1892	4
1893	3
1894	5
1895	4
1896	10
1897	1
1898	5
1899	4
1900	5
1901	4
1902	5
1903	5
1904	7
1905	21
1906	38
1907	22
1908	13
1909	15
1910	18
1911	32
1912	14
1913	39
1914	33
1915	11
1916	72
1917	67
1918	72
1919	112
1920	63
1921	22
1922	72
1923	359
1924	244
1925	405
1926	153
1927	183
1928	120
1929	234
1930	240
1931	178
1932	260
1933	796
1934	410
1935	981
1936	307
1937	335
1938	399
1939	415
1940	248
1941	536
1942	578
1943	213
1944	611
1945	287
1946	530
1947	371
1948	695
1949	831
1950	1,237
1951	527
1952	393
1953	303
1954	460
1955	427
1956	1,086
1957	392
1958	314
1959	484
1960	296
1961	511
1962	344
1963	631
1964	538
1965	340
1966	630
1967	748
1968	605
1969	531
1970	412
1971	992
1972	1,234
1973	581
1974	1,192
1975	827
1976	655
1977	616
1978	538
1979	1,130
1980	657
1981	497
1982	560
1983	782
1984	1,054
1985	632
1986	396
1987	1,002
1988	1,058
1989	857
1990	990
1991	3,294
1992	1,324
1993	2,926
1994	1,004
1995	1,051
1996	1,074
1997	1,553
1998	1,410
1999	997
2000	1,114
2001	1,218
2002	1,613
2003	1,167
2004	870
2005	1,048
2006	842
2007	613
2008	1,256
2009	1,030
2010	931
2011	746
2012	884
2013	623
2014	547
2015	691
2016	1,012
2017	437
2018	414
2019	2,501
2020	542
2021	469
2022	497
2023	960
2024	1,133
2025	314

Download the Data

Data for records on 1917-10-31: 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 50	50
50 to 100	4
100 to 150	0
150 to 200	0
200 to 250	1