Weather Records on 18 December 1940

242 weather records were set or tied worldwide on 18 December 1940. Highest significance: Ilulissat (Jakobshavn), GL.

Key Facts for 18 December 1940

On 18 December 1940, 242 weather records were set or tied at long-record stations worldwide.
64 were record highs and 36 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 4 monthly and 238 daily.
Ilulissat (Jakobshavn) set a monthly record daily precipitation of 32.0 mm (1.3 in) on 18 December 1940.
Across 156 earlier years (1793 to 2025) the same calendar date averaged 481 records.

Record Map

242 stations

242 station records on 18 December 1940 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 December 1940: highest significance records shown on the map
Station	Country	Type	Value	Significance
Ilulissat (Jakobshavn)	Greenland [Denmark]	Record daily precipitation	32.0 mm (1.3 in)	63 of 100 (Major)
Chico UNIV Farm	United States	Record daily precipitation	80.3 mm (3.2 in)	49 of 100 (Notable)
Colusa Brg	United States	Record daily precipitation	55.4 mm (2.2 in)	48 of 100 (Notable)
Macalister Post Office	Australia	Record daily precipitation	130.8 mm (5.1 in)	46 of 100 (Notable)
Saint Helena	United States	Record daily precipitation	85.3 mm (3.4 in)	46 of 100 (Notable)
Horton	United States	Record snow depth	10.2 cm (4.0 in)	44 of 100 (Notable)
Warra Post Office	Australia	Record daily precipitation	66.0 mm (2.6 in)	43 of 100 (Notable)
Marysville D St Brg	United States	Record daily precipitation	47.8 mm (1.9 in)	40 of 100 (Notable)
Santa Rosa	United States	Record daily precipitation	56.6 mm (2.2 in)	39 of 100 (Notable)
China Flat	United States	Record daily precipitation	67.6 mm (2.7 in)	38 of 100 (Notable)
Jacksonville	United States	Record daily precipitation	32.3 mm (1.3 in)	38 of 100 (Notable)
Red Bluff Muni AP	United States	Record daily precipitation	49.8 mm (2.0 in)	38 of 100 (Notable)
Jandowae Post Office	Australia	Record daily precipitation	67.3 mm (2.6 in)	37 of 100 (Notable)
Cloverdale	United States	Record daily precipitation	79.2 mm (3.1 in)	37 of 100 (Notable)
Hays 1 S	United States	Record snow depth	10.2 cm (4.0 in)	37 of 100 (Notable)
De Sabla	United States	Record daily precipitation	127.0 mm (5.0 in)	36 of 100 (Notable)
Quincy	United States	Record daily precipitation	77.2 mm (3.0 in)	36 of 100 (Notable)
Upper Mattole	United States	Record daily precipitation	124.0 mm (4.9 in)	35 of 100 (Notable)
Concordia ASOS	United States	Record snow depth	20.3 cm (8.0 in)	35 of 100 (Notable)
Clarinda	United States	Record snow depth	317.5 cm (125.0 in)	33 of 100 (Routine)
Putbus	Germany	Record low maximum temperature	-4.6 C (23.7 F)	32 of 100 (Routine)
West Branch	United States	Record daily precipitation	122.2 mm (4.8 in)	32 of 100 (Routine)
Ames 3 SW	United States	Record snow depth	215.9 cm (85.0 in)	32 of 100 (Routine)
Santa Barbara	United States	Record daily precipitation	50.0 mm (2.0 in)	31 of 100 (Routine)
Tamarack	United States	Record daily precipitation	57.2 mm (2.3 in)	31 of 100 (Routine)
Grants Pass	United States	Record daily precipitation	35.1 mm (1.4 in)	31 of 100 (Routine)
Salzburg	Austria	Record low minimum temperature	-24.1 C (-11.4 F)	30 of 100 (Routine)
Jimbour State School	Australia	Record daily precipitation	105.7 mm (4.2 in)	29 of 100 (Routine)
Bulgandramine	Australia	Record daily precipitation	44.7 mm (1.8 in)	29 of 100 (Routine)
Sutherland Mwsdb	Australia	Record daily precipitation	52.6 mm (2.1 in)	29 of 100 (Routine)
Oroville Brg	United States	Record daily precipitation	63.8 mm (2.5 in)	29 of 100 (Routine)
Ukiah	United States	Record daily precipitation	57.2 mm (2.3 in)	29 of 100 (Routine)
Salzburg	Austria	Record low maximum temperature	-12.6 C (9.3 F)	28 of 100 (Routine)
Regensburg	Germany	Record low minimum temperature	-17.8 C (0.0 F)	28 of 100 (Routine)
Napa State Hospital	United States	Record daily precipitation	34.5 mm (1.4 in)	28 of 100 (Routine)
Santa Clara UNIV	United States	Record daily precipitation	34.0 mm (1.3 in)	28 of 100 (Routine)
Bathurst Agricultural Station	Australia	Record daily precipitation	45.0 mm (1.8 in)	27 of 100 (Routine)
Bamberg	Germany	Record low minimum temperature	-18.2 C (-0.8 F)	27 of 100 (Routine)
Heinersreuth-Vollhof	Germany	Record low minimum temperature	-20.4 C (-4.7 F)	27 of 100 (Routine)
Heinersreuth-Vollhof	Germany	Record snow depth	22.0 cm (8.7 in)	27 of 100 (Routine)
Healdsburg	United States	Record daily precipitation	66.5 mm (2.6 in)	27 of 100 (Routine)
Knights Landing	United States	Record daily precipitation	33.0 mm (1.3 in)	27 of 100 (Routine)
Dalby Post Office	Australia	Record daily precipitation	47.8 mm (1.9 in)	26 of 100 (Routine)
Regensburg	Germany	Record low maximum temperature	-8.9 C (16.0 F)	26 of 100 (Routine)
Los Gatos	United States	Record daily precipitation	73.2 mm (2.9 in)	24 of 100 (Routine)
Tbilisi	Georgia	Record high minimum temperature	4.9 C (40.8 F)	23 of 100 (Routine)
Munchen-Nymphenburg	Germany	Record low minimum temperature	-22.1 C (-7.8 F)	23 of 100 (Routine)
Parker	United States	Record high minimum temperature	8.3 C (46.9 F)	23 of 100 (Routine)
Colgate Powerhouse	United States	Record daily precipitation	47.8 mm (1.9 in)	23 of 100 (Routine)
Paso Robles	United States	Record daily precipitation	36.8 mm (1.4 in)	23 of 100 (Routine)
Dobbins Colgate Foreba	United States	Record daily precipitation	52.1 mm (2.1 in)	22 of 100 (Routine)
Lewers Rch	United States	Record daily precipitation	25.4 mm (1.0 in)	22 of 100 (Routine)
Mendooran Post Office	Australia	Record daily precipitation	46.2 mm (1.8 in)	21 of 100 (Routine)
St Georges	Canada	Record low maximum temperature	-8.9 C (16.0 F)	21 of 100 (Routine)
Lake Spaulding	United States	Record daily precipitation	63.5 mm (2.5 in)	21 of 100 (Routine)
Burr Oak 4S	United States	Record snow depth	17.8 cm (7.0 in)	21 of 100 (Routine)
Broken Bow 2 W	United States	Record snow depth	30.5 cm (12.0 in)	21 of 100 (Routine)
Klamath Falls 2 SSW	United States	Record daily precipitation	20.3 mm (0.8 in)	20 of 100 (Routine)
Bridgetown Comparison	Australia	Record daily precipitation	16.5 mm (0.6 in)	20 of 100 (Routine)
Ashland	United States	Record daily precipitation	22.9 mm (0.9 in)	20 of 100 (Routine)

Counts by Type and Timescale

242 records

Records set or tied on 18 December 1940 by type: Highest daily maximum 12, Lowest daily maximum 17, Highest daily minimum 52, Lowest daily minimum 19, Heaviest daily rainfall 111, Heaviest daily snowfall 1, Deepest snow cover 30.

Records on 18 December 1940 by type
Record type	Records
Highest daily maximum	12
Lowest daily maximum	17
Highest daily minimum	52
Lowest daily minimum	19
Heaviest daily rainfall	111
Heaviest daily snowfall	1
Deepest snow cover	30

Records on 18 December 1940 by timescale: all-time 0, monthly 4, daily 238.

How Much Records Were Beaten By

203 broken records

Margins by which the 203 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 1270.0. Ties are not counted.

Top 20 by Significance

18 December 1940

Top 20 records on 18 December 1940 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 December 1940	Ilulissat (Jakobshavn), GL	monthly rain	32.0 mm (1.3 in)	16.0 mm (0.6 in)	24 years	63 of 100 (Major)
18 December 1940	Chico UNIV Farm, US	daily rain	80.3 mm (3.2 in)	64.3 mm (2.5 in)	20 years	49 of 100 (Notable)
18 December 1940	Colusa Brg, US	daily rain	55.4 mm (2.2 in)	49.3 mm (1.9 in)	15 years	48 of 100 (Notable)
18 December 1940	Macalister Post Office, AU	daily rain	130.8 mm (5.1 in)	88.9 mm (3.5 in)	10 years	46 of 100 (Notable)
18 December 1940	Saint Helena, US	daily rain	85.3 mm (3.4 in)	78.2 mm (3.1 in)	20 years	46 of 100 (Notable)
18 December 1940	Horton, US	daily snow depth	10.2 cm (4.0 in)	7.7 cm (3.0 in)	47 years	44 of 100 (Notable)
18 December 1940	Warra Post Office, AU	daily rain	66.0 mm (2.6 in)	43.1 mm (1.7 in)	46 years	43 of 100 (Notable)
18 December 1940	Marysville D St Brg, US	daily rain	47.8 mm (1.9 in)	32.6 mm (1.3 in)	15 years	40 of 100 (Notable)
18 December 1940	Santa Rosa, US	daily rain	56.6 mm (2.2 in)	49.0 mm (1.9 in)	15 years	39 of 100 (Notable)
18 December 1940	China Flat, US	daily rain	67.6 mm (2.7 in)	49.8 mm (2.0 in)	14 years	38 of 100 (Notable)
18 December 1940	Jacksonville, US	daily rain	32.3 mm (1.3 in)	21.4 mm (0.8 in)	41 years	38 of 100 (Notable)
18 December 1940	Red Bluff Muni AP, US	daily rain	49.8 mm (2.0 in)	27.4 mm (1.1 in)	45 years	38 of 100 (Notable)
18 December 1940	Jandowae Post Office, AU	daily rain	67.3 mm (2.6 in)	43.2 mm (1.7 in)	36 years	37 of 100 (Notable)
18 December 1940	Cloverdale, US	daily rain	79.2 mm (3.1 in)	53.8 mm (2.1 in)	20 years	37 of 100 (Notable)
18 December 1940	Hays 1 S, US	daily snow depth	10.2 cm (4.0 in)	10.2 cm (4.0 in)	40 years	37 of 100 (Notable)
18 December 1940	De Sabla, US	daily rain	127.0 mm (5.0 in)	83.8 mm (3.3 in)	20 years	36 of 100 (Notable)
18 December 1940	Quincy, US	daily rain	77.2 mm (3.0 in)	56.6 mm (2.2 in)	15 years	36 of 100 (Notable)
18 December 1940	Upper Mattole, US	daily rain	124.0 mm (4.9 in)	70.7 mm (2.8 in)	20 years	35 of 100 (Notable)
18 December 1940	Concordia ASOS, US	daily snow depth	20.3 cm (8.0 in)	7.6 cm (3.0 in)	33 years	35 of 100 (Notable)
18 December 1940	Clarinda, US	daily snow depth	317.5 cm (125.0 in)	114.3 cm (45.0 in)	38 years	33 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 1940

Records set or tied on this calendar date in each year from 1793 to 1940. 1940 had 242 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 1940-12-18: 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 200	199
200 to 400	0
400 to 600	1
600 to 800	1
800 to 1000	0
1000 to 1200	1
1200 to 1400	1