Weather Records on 18 December 1917

62 weather records were set or tied worldwide on 18 December 1917. Highest significance: Portland Rfc City, US.

Key Facts for 18 December 1917

On 18 December 1917, 62 weather records were set or tied at long-record stations worldwide.
9 were record highs and 10 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 0 monthly and 62 daily.
Portland Rfc City set a daily record precipitation of 37.1 mm (1.5 in) on 18 December 1917.
Across 156 earlier years (1793 to 2025) the same calendar date averaged 482 records.

Record Map

62 stations

62 station records on 18 December 1917 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 December 1917: highest significance records shown on the map
Station	Country	Type	Value	Significance
Portland Rfc City	United States	Record daily precipitation	37.1 mm (1.5 in)	24 of 100 (Routine)
Calgary Int'l A	Canada	Record daily snowfall	5.6 cm (2.2 in)	23 of 100 (Routine)
Wellington East	Australia	Record daily precipitation	15.2 mm (0.6 in)	20 of 100 (Routine)
Mount Pleasant	Australia	Record daily precipitation	10.2 mm (0.4 in)	20 of 100 (Routine)
Calgary Int'l A	Canada	Record daily precipitation	5.6 mm (0.22 in)	20 of 100 (Routine)
Port Clinton (Yararoo)	Australia	Record daily precipitation	10.7 mm (0.4 in)	20 of 100 (Routine)
Hawker (Holowilena)	Australia	Record daily precipitation	1.5 mm (0.06 in)	20 of 100 (Routine)
Coonalpyn	Australia	Record daily precipitation	10.7 mm (0.4 in)	20 of 100 (Routine)
Olympia Priest Pt Park	United States	Record daily precipitation	50.8 mm (2.0 in)	20 of 100 (Routine)
Kapunda Reservoir	Australia	Record daily precipitation	8.9 mm (0.35 in)	18 of 100 (Routine)
Cape Jervis Lighthouse	Australia	Record daily precipitation	5.6 mm (0.22 in)	18 of 100 (Routine)
Vasilevici	Belarus	Record daily precipitation	8.0 mm (0.31 in)	18 of 100 (Routine)
Kanmantoo	Australia	Record daily precipitation	9.1 mm (0.36 in)	16 of 100 (Routine)
Meningie	Australia	Record daily precipitation	3.8 mm (0.15 in)	16 of 100 (Routine)
Winnemucca AP	United States	Record high maximum temperature	16.1 C (61.0 F)	16 of 100 (Routine)
Murray Bridge Comparison	Australia	Record daily precipitation	8.4 mm (0.33 in)	15 of 100 (Routine)
Stockwell	Australia	Record daily precipitation	8.9 mm (0.35 in)	14 of 100 (Routine)
Sedan (Sandleton)	Australia	Record daily precipitation	8.1 mm (0.32 in)	14 of 100 (Routine)
Gysinge	Sweden	Record daily precipitation	10.2 mm (0.4 in)	14 of 100 (Routine)
Ashbourne	Australia	Record daily precipitation	6.4 mm (0.25 in)	13 of 100 (Routine)
Old Noarlunga Post Office	Australia	Record daily precipitation	7.1 mm (0.28 in)	13 of 100 (Routine)
Mount Torrens	Australia	Record daily precipitation	11.2 mm (0.4 in)	13 of 100 (Routine)
Woodside	Australia	Record daily precipitation	9.4 mm (0.37 in)	13 of 100 (Routine)
Milang	Australia	Record daily precipitation	6.4 mm (0.25 in)	13 of 100 (Routine)
Calgary Int'l A	Canada	Record high maximum temperature	10.0 C (50.0 F)	13 of 100 (Routine)
Chicoutimi	Canada	Record low minimum temperature	-37.2 C (-35.0 F)	13 of 100 (Routine)
Portland Rfc City	United States	Record high maximum temperature	15.0 C (59.0 F)	13 of 100 (Routine)
Kingscote	Australia	Record daily precipitation	5.1 mm (0.20 in)	12 of 100 (Routine)
Kapunda	Australia	Record daily precipitation	18.3 mm (0.7 in)	12 of 100 (Routine)
Jamestown	South Africa	Record daily precipitation	14.2 mm (0.6 in)	12 of 100 (Routine)
Paskeville	Australia	Record daily precipitation	10.7 mm (0.4 in)	11 of 100 (Routine)
Kapunda Water Works	Australia	Record daily precipitation	18.5 mm (0.7 in)	11 of 100 (Routine)
Meadows	Australia	Record daily precipitation	10.9 mm (0.4 in)	11 of 100 (Routine)
Nikolaevsk-Na-Amure	Russia	Record daily precipitation	3.6 mm (0.14 in)	11 of 100 (Routine)
Nairne	Australia	Record daily precipitation	7.6 mm (0.30 in)	10 of 100 (Routine)
Battunga	Australia	Record daily precipitation	13.0 mm (0.5 in)	10 of 100 (Routine)
Sedan	Australia	Record daily precipitation	5.1 mm (0.20 in)	10 of 100 (Routine)
Robe Comparison	Australia	Record high maximum temperature	28.6 C (83.5 F)	10 of 100 (Routine)
New Westminster	Canada	Record high maximum temperature	11.1 C (52.0 F)	10 of 100 (Routine)
Nemours (Ghazaouet)	Algeria	Record low maximum temperature	12.0 C (53.6 F)	9 of 100 (Routine)
Goolwa Council Depot	Australia	Record daily precipitation	4.1 mm (0.16 in)	9 of 100 (Routine)
Truro	Australia	Record daily precipitation	7.6 mm (0.30 in)	9 of 100 (Routine)
Nikolaevsk-Na-Amure	Russia	Record high minimum temperature	-4.9 C (23.2 F)	9 of 100 (Routine)
Vastervik	Sweden	Record low minimum temperature	-9.0 C (15.8 F)	9 of 100 (Routine)
Burra (Kooringa)	Australia	Record daily precipitation	9.1 mm (0.36 in)	8 of 100 (Routine)
Robe Comparison	Australia	Record high minimum temperature	16.3 C (61.3 F)	8 of 100 (Routine)
Stockholm	Sweden	Record low maximum temperature	-4.0 C (24.8 F)	8 of 100 (Routine)
Morris W Cntrl Rsch & Outreach	United States	Record high minimum temperature	-2.8 C (27.0 F)	8 of 100 (Routine)
Algiers-Ville/Universite	Algeria	Record low maximum temperature	12.0 C (53.6 F)	7 of 100 (Routine)
Algiers-Ville/Universite	Algeria	Record low minimum temperature	7.0 C (44.6 F)	7 of 100 (Routine)
Snowtown	Australia	Record daily precipitation	9.9 mm (0.39 in)	7 of 100 (Routine)
Second Valley (Poolamacca)	Australia	Record daily precipitation	7.6 mm (0.30 in)	7 of 100 (Routine)
Woodburn	Australia	Record daily precipitation	5.1 mm (0.20 in)	7 of 100 (Routine)
Cathcart	South Africa	Record daily precipitation	15.2 mm (0.6 in)	7 of 100 (Routine)
Boras	Sweden	Record low minimum temperature	-12.0 C (10.4 F)	6 of 100 (Routine)
Port Elliot Caravan Park	Australia	Record daily precipitation	2.8 mm (0.11 in)	3 of 100 (Routine)
Overland Corner	Australia	Record daily precipitation	4.6 mm (0.18 in)	3 of 100 (Routine)
Mount Barker	Australia	Record daily precipitation	7.6 mm (0.30 in)	2 of 100 (Routine)
Karlshamn	Sweden	Record low maximum temperature	-3.0 C (26.6 F)	2 of 100 (Routine)
Karlshamn	Sweden	Record low minimum temperature	-8.0 C (17.6 F)	1 of 100 (Routine)

Counts by Type and Timescale

62 records

Records set or tied on 18 December 1917 by type: Highest daily maximum 5, Lowest daily maximum 4, Highest daily minimum 4, Lowest daily minimum 6, Heaviest daily rainfall 42, Heaviest daily snowfall 1.

Records on 18 December 1917 by type
Record type	Records
Highest daily maximum	5
Lowest daily maximum	4
Highest daily minimum	4
Lowest daily minimum	6
Heaviest daily rainfall	42
Heaviest daily snowfall	1
Deepest snow cover	0

Records on 18 December 1917 by timescale: all-time 0, monthly 0, daily 62.

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 53.0. Ties are not counted.

Top 20 by Significance

18 December 1917

Top 20 records on 18 December 1917 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 December 1917	Portland Rfc City, US	daily rain	37.1 mm (1.5 in)	12.2 mm (0.5 in)	34 years	24 of 100 (Routine)
18 December 1917	Calgary Int'l A, CA	daily snowfall	5.6 cm (2.2 in)	5.3 cm (2.1 in)	24 years	23 of 100 (Routine)
18 December 1917	Wellington East, AU	daily rain	15.2 mm (0.6 in)	12.4 mm (0.5 in)	11 years	20 of 100 (Routine)
18 December 1917	Mount Pleasant, AU	daily rain	10.2 mm (0.4 in)	7.2 mm (0.28 in)	30 years	20 of 100 (Routine)
18 December 1917	Calgary Int'l A, CA	daily rain	5.6 mm (0.22 in)	5.3 mm (0.21 in)	24 years	20 of 100 (Routine)
18 December 1917	Port Clinton (Yararoo), AU	daily rain	10.7 mm (0.4 in)	4.6 mm (0.18 in)	30 years	20 of 100 (Routine)
18 December 1917	Hawker (Holowilena), AU	daily rain	1.5 mm (0.06 in)	1.5 mm (0.06 in)	47 years	20 of 100 (Routine)
18 December 1917	Coonalpyn, AU	daily rain	10.7 mm (0.4 in)	9.7 mm (0.38 in)	16 years	20 of 100 (Routine)
18 December 1917	Olympia Priest Pt Park, US	daily rain	50.8 mm (2.0 in)	10.2 mm (0.4 in)	32 years	20 of 100 (Routine)
18 December 1917	Kapunda Reservoir, AU	daily rain	8.9 mm (0.35 in)	8.4 mm (0.33 in)	11 years	18 of 100 (Routine)
18 December 1917	Cape Jervis Lighthouse, AU	daily rain	5.6 mm (0.22 in)	5.1 mm (0.20 in)	23 years	18 of 100 (Routine)
18 December 1917	Vasilevici, BY	daily rain	8.0 mm (0.31 in)	3.0 mm (0.12 in)	18 years	18 of 100 (Routine)
18 December 1917	Kanmantoo, AU	daily rain	9.1 mm (0.36 in)	5.5 mm (0.22 in)	30 years	16 of 100 (Routine)
18 December 1917	Meningie, AU	daily rain	3.8 mm (0.15 in)	1.8 mm (0.07 in)	30 years	16 of 100 (Routine)
18 December 1917	Winnemucca AP, US	daily high max	16.1 C (61.0 F)	1.7 C (3.1 F)	30 years	16 of 100 (Routine)
18 December 1917	Murray Bridge Comparison, AU	daily rain	8.4 mm (0.33 in)	5.6 mm (0.22 in)	15 years	15 of 100 (Routine)
18 December 1917	Stockwell, AU	daily rain	8.9 mm (0.35 in)	4.3 mm (0.17 in)	15 years	14 of 100 (Routine)
18 December 1917	Sedan (Sandleton), AU	daily rain	8.1 mm (0.32 in)	6.3 mm (0.25 in)	15 years	14 of 100 (Routine)
18 December 1917	Gysinge, SE	daily rain	10.2 mm (0.4 in)	1.3 mm (0.05 in)	22 years	14 of 100 (Routine)
18 December 1917	Ashbourne, AU	daily rain	6.4 mm (0.25 in)	4.1 mm (0.16 in)	15 years	13 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

1793 to 1917

Records set or tied on this calendar date in each year from 1793 to 1917. 1917 had 62 records.

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

Records on 12-18 in each year
Year	Records
1793	1
1796	1
1805	1
1814	1
1825	1
1846	1
1849	1
1852	2
1858	1
1859	4
1862	2
1864	1
1868	1
1873	1
1875	1
1876	2
1878	1
1881	2
1882	1
1884	2
1886	1
1887	1
1888	1
1889	4
1890	5
1892	4
1894	8
1895	1
1897	4
1898	9
1899	3
1900	2
1901	6
1902	33
1903	11
1904	25
1905	3
1906	21
1907	15
1908	16
1909	18
1910	19
1911	9
1912	33
1913	38
1914	20
1915	28
1916	57
1917	62
1918	21
1919	117
1920	77
1921	123
1922	108
1923	378
1924	480
1925	74
1926	173
1927	151
1928	165
1929	366
1930	230
1931	360
1932	353
1933	506
1934	209
1935	138
1936	466
1937	459
1938	185
1939	900
1940	242
1941	213
1942	281
1943	419
1944	191
1945	598
1946	199
1947	266
1948	354
1949	561
1950	289
1951	867
1952	450
1953	373
1954	507
1955	611
1956	333
1957	901
1958	524
1959	477
1960	477
1961	885
1962	759
1963	571
1964	840
1965	402
1966	644
1967	1,105
1968	488
1969	376
1970	502
1971	387
1972	375
1973	1,008
1974	229
1975	625
1976	459
1977	992
1978	946
1979	1,087
1980	772
1981	1,362
1982	537
1983	2,014
1984	1,439
1985	1,384
1986	875
1987	1,505
1988	1,061
1989	1,818
1990	1,367
1991	756
1992	1,045
1993	697
1994	643
1995	1,065
1996	1,833
1997	1,195
1998	863
1999	923
2000	1,572
2001	906
2002	1,437
2003	987
2004	506
2005	987
2006	1,167
2007	746
2008	1,014
2009	1,253
2010	1,322
2011	697
2012	729
2013	513
2014	556
2015	1,254
2016	1,821
2017	516
2018	464
2019	679
2020	326
2021	762
2022	536
2023	1,293
2024	780
2025	994

Download the Data

Data for records on 1917-12-18: 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 10	51
10 to 20	3
20 to 30	0
30 to 40	0
40 to 50	0
50 to 60	1