Weather Records on 17 December 1940

248 weather records were set or tied worldwide on 17 December 1940. Highest significance: Ozena, US.

Key Facts for 17 December 1940

On 17 December 1940, 248 weather records were set or tied at long-record stations worldwide.
51 were record highs and 34 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 8 monthly and 239 daily.
Ozena set a daily record precipitation of 82.3 mm (3.2 in) on 17 December 1940.
Across 160 earlier years (1793 to 2025) the same calendar date averaged 464 records.

Record Map

248 stations

248 station records on 17 December 1940 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 December 1940: highest significance records shown on the map
Station	Country	Type	Value	Significance
Ozena	United States	Record daily precipitation	82.3 mm (3.2 in)	48 of 100 (Notable)
Raquette Lake	United States	Record daily precipitation	44.7 mm (1.8 in)	45 of 100 (Notable)
Redding Fire STN 2	United States	Record daily precipitation	76.2 mm (3.0 in)	41 of 100 (Notable)
Potchefstroom;Braksp	South Africa	Record daily precipitation	52.1 mm (2.1 in)	39 of 100 (Notable)
Oroville 1 N	United States	Record daily precipitation	58.4 mm (2.3 in)	39 of 100 (Notable)
Heinersreuth-Vollhof	Germany	Record snow depth	22.0 cm (8.7 in)	36 of 100 (Notable)
Pomona/Fairplex	United States	Record daily precipitation	57.7 mm (2.3 in)	33 of 100 (Routine)
Independence	United States	Record daily snowfall	10.2 cm (4.0 in)	30 of 100 (Routine)
Escalante	United States	Record daily snowfall	7.6 cm (3.0 in)	30 of 100 (Routine)
Hvar	Croatia	Record low minimum temperature	-2.6 C (27.3 F)	29 of 100 (Routine)
Ames 3 SW	United States	Record snow depth	228.6 cm (90.0 in)	29 of 100 (Routine)
Webster City	United States	Record snow depth	274.3 cm (108.0 in)	29 of 100 (Routine)
Ft Deposit	United States	Record daily precipitation	56.1 mm (2.2 in)	28 of 100 (Routine)
Claremont Pomona Clg	United States	Record daily precipitation	48.8 mm (1.9 in)	28 of 100 (Routine)
Salzburg	Austria	Record low minimum temperature	-27.7 C (-17.9 F)	27 of 100 (Routine)
Cloverdale	United States	Record daily precipitation	45.7 mm (1.8 in)	27 of 100 (Routine)
Quincy	United States	Record daily precipitation	45.7 mm (1.8 in)	27 of 100 (Routine)
West Branch	United States	Record daily precipitation	69.9 mm (2.8 in)	27 of 100 (Routine)
Aztec Ruins Nm	United States	Record daily snowfall	10.2 cm (4.0 in)	27 of 100 (Routine)
Lake Spaulding	United States	Record daily precipitation	55.9 mm (2.2 in)	26 of 100 (Routine)
Sierra Madre Henszey	United States	Record daily precipitation	57.7 mm (2.3 in)	26 of 100 (Routine)
Durango	United States	Record daily snowfall	12.7 cm (5.0 in)	26 of 100 (Routine)
Ebor (Wongwibinda)	Australia	Record daily precipitation	58.4 mm (2.3 in)	25 of 100 (Routine)
De Sabla	United States	Record daily precipitation	68.6 mm (2.7 in)	25 of 100 (Routine)
San Bernardino F S 226	United States	Record daily precipitation	41.1 mm (1.6 in)	25 of 100 (Routine)
Jemez Springs	United States	Record daily snowfall	15.0 cm (5.9 in)	25 of 100 (Routine)
Redlands	United States	Record daily precipitation	27.2 mm (1.1 in)	24 of 100 (Routine)
Boonton 1 SE	United States	Record daily precipitation	33.8 mm (1.3 in)	24 of 100 (Routine)
Regensburg	Germany	Record low maximum temperature	-10.0 C (14.0 F)	23 of 100 (Routine)
Putbus	Germany	Record low maximum temperature	-5.8 C (21.6 F)	23 of 100 (Routine)
Aspendell	United States	Record daily snowfall	27.9 cm (11.0 in)	23 of 100 (Routine)
Pasadena	United States	Record daily precipitation	59.7 mm (2.4 in)	23 of 100 (Routine)
Indianola 1SW	United States	Record snow depth	304.8 cm (120.0 in)	23 of 100 (Routine)
Minneapolis	United States	Record snow depth	17.8 cm (7.0 in)	23 of 100 (Routine)
Kremsmuenster	Austria	Record low maximum temperature	-12.0 C (10.4 F)	22 of 100 (Routine)
Chemnitz	Germany	Record low minimum temperature	-16.9 C (1.6 F)	22 of 100 (Routine)
Elandsheuwel	South Africa	Record daily precipitation	35.3 mm (1.4 in)	22 of 100 (Routine)
Tribes Hill	United States	Record daily precipitation	25.4 mm (1.0 in)	21 of 100 (Routine)
Tarnaby	Sweden	Record daily precipitation	24.2 mm (1.0 in)	20 of 100 (Routine)
Kislovodsk	Russia	Record daily precipitation	19.3 mm (0.8 in)	20 of 100 (Routine)
Independence	United States	Record daily precipitation	14.0 mm (0.6 in)	20 of 100 (Routine)
Brome	Canada	Record daily precipitation	22.9 mm (0.9 in)	20 of 100 (Routine)
Durango	United States	Record daily precipitation	11.9 mm (0.5 in)	20 of 100 (Routine)
Kokshetay	Kazakhstan	Record daily precipitation	4.4 mm (0.17 in)	20 of 100 (Routine)
Cheboygan	United States	Record daily precipitation	11.4 mm (0.4 in)	20 of 100 (Routine)
Aspendell	United States	Record daily precipitation	23.6 mm (0.9 in)	20 of 100 (Routine)
Susanville 2SW	United States	Record daily precipitation	12.2 mm (0.5 in)	20 of 100 (Routine)
Rodeo	United States	Record daily precipitation	9.7 mm (0.38 in)	20 of 100 (Routine)
Casa Grande	United States	Record daily precipitation	5.6 mm (0.22 in)	20 of 100 (Routine)
Marysville D St Brg	United States	Record daily precipitation	24.4 mm (1.0 in)	20 of 100 (Routine)
Jerome	United States	Record snow depth	5.1 cm (2.0 in)	20 of 100 (Routine)
Napa State Hospital	United States	Record daily precipitation	20.6 mm (0.8 in)	20 of 100 (Routine)
Escalante	United States	Record daily precipitation	6.9 mm (0.27 in)	20 of 100 (Routine)
Clifton	United States	Record daily precipitation	5.6 mm (0.22 in)	20 of 100 (Routine)
Intake	United States	Record daily precipitation	7.4 mm (0.29 in)	20 of 100 (Routine)
Nogales	United States	Record daily precipitation	13.2 mm (0.5 in)	20 of 100 (Routine)
San Simon	United States	Record daily precipitation	2.5 mm (0.10 in)	20 of 100 (Routine)
Chico UNIV Farm	United States	Record daily precipitation	34.3 mm (1.4 in)	20 of 100 (Routine)
Mill Creek 2	United States	Record daily precipitation	27.9 mm (1.1 in)	20 of 100 (Routine)
Chatham	United States	Record daily precipitation	33.3 mm (1.3 in)	20 of 100 (Routine)

Counts by Type and Timescale

248 records

Records set or tied on 17 December 1940 by type: Highest daily maximum 18, Lowest daily maximum 20, Highest daily minimum 33, Lowest daily minimum 14, Heaviest daily rainfall 122, Heaviest daily snowfall 9, Deepest snow cover 32.

Records on 17 December 1940 by type
Record type	Records
Highest daily maximum	18
Lowest daily maximum	20
Highest daily minimum	33
Lowest daily minimum	14
Heaviest daily rainfall	122
Heaviest daily snowfall	9
Deepest snow cover	32

Records on 17 December 1940 by timescale: all-time 1, monthly 8, daily 239.

How Much Records Were Beaten By

212 broken records

Margins by which the 212 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 1016.0. Ties are not counted.

Top 20 by Significance

17 December 1940

Top 20 records on 17 December 1940 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 December 1940	Ozena, US	daily rain	82.3 mm (3.2 in)	80.0 mm (3.1 in)	19 years	48 of 100 (Notable)
17 December 1940	Raquette Lake, US	daily rain	44.7 mm (1.8 in)	34.5 mm (1.4 in)	5 years	45 of 100 (Notable)
17 December 1940	Redding Fire STN 2, US	daily rain	76.2 mm (3.0 in)	56.4 mm (2.2 in)	15 years	41 of 100 (Notable)
17 December 1940	Potchefstroom;Braksp, ZA	daily rain	52.1 mm (2.1 in)	26.2 mm (1.0 in)	31 years	39 of 100 (Notable)
17 December 1940	Oroville 1 N, US	daily rain	58.4 mm (2.3 in)	37.6 mm (1.5 in)	45 years	39 of 100 (Notable)
17 December 1940	Heinersreuth-Vollhof, DE	daily snow depth	22.0 cm (8.7 in)	13.0 cm (5.1 in)	34 years	36 of 100 (Notable)
17 December 1940	Pomona/Fairplex, US	daily rain	57.7 mm (2.3 in)	32.3 mm (1.3 in)	26 years	33 of 100 (Routine)
17 December 1940	Independence, US	daily snowfall	10.2 cm (4.0 in)	10.2 cm (4.0 in)	46 years	30 of 100 (Routine)
17 December 1940	Escalante, US	daily snowfall	7.6 cm (3.0 in)	7.6 cm (3.0 in)	39 years	30 of 100 (Routine)
17 December 1940	Hvar, HR	daily low min	-2.6 C (27.3 F)	4.9 C (8.8 F)	33 years	29 of 100 (Routine)
17 December 1940	Ames 3 SW, US	daily snow depth	228.6 cm (90.0 in)	101.6 cm (40.0 in)	23 years	29 of 100 (Routine)
17 December 1940	Webster City, US	monthly snow depth	274.3 cm (108.0 in)	71.1 cm (28.0 in)	8 years	29 of 100 (Routine)
17 December 1940	Ft Deposit, US	daily rain	56.1 mm (2.2 in)	38.1 mm (1.5 in)	17 years	28 of 100 (Routine)
17 December 1940	Claremont Pomona Clg, US	daily rain	48.8 mm (1.9 in)	27.7 mm (1.1 in)	26 years	28 of 100 (Routine)
17 December 1940	Salzburg, AT	all-time low min	-27.7 C (-17.9 F)	0.7 C (1.3 F)	0 years	27 of 100 (Routine)
17 December 1940	Cloverdale, US	daily rain	45.7 mm (1.8 in)	20.8 mm (0.8 in)	45 years	27 of 100 (Routine)
17 December 1940	Quincy, US	daily rain	45.7 mm (1.8 in)	30.5 mm (1.2 in)	29 years	27 of 100 (Routine)
17 December 1940	West Branch, US	daily rain	69.9 mm (2.8 in)	57.2 mm (2.3 in)	29 years	27 of 100 (Routine)
17 December 1940	Aztec Ruins Nm, US	daily snowfall	10.2 cm (4.0 in)	7.7 cm (3.0 in)	26 years	27 of 100 (Routine)
17 December 1940	Lake Spaulding, US	daily rain	55.9 mm (2.2 in)	33.0 mm (1.3 in)	37 years	26 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 248 records.

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

Records on 12-17 in each year
Year	Records
1793	2
1796	1
1806	2
1808	2
1814	1
1815	1
1839	1
1845	1
1846	4
1847	1
1848	1
1859	3
1866	1
1867	1
1868	1
1869	2
1873	2
1876	3
1877	2
1878	1
1879	2
1881	2
1885	1
1886	1
1888	2
1889	2
1890	4
1892	4
1893	2
1894	4
1895	3
1896	4
1897	4
1898	2
1899	1
1900	6
1901	5
1902	47
1903	2
1904	14
1905	2
1906	17
1907	9
1908	13
1909	5
1910	37
1911	12
1912	15
1913	21
1914	17
1915	31
1916	21
1917	21
1918	21
1919	109
1920	97
1921	94
1922	120
1923	170
1924	505
1925	79
1926	172
1927	143
1928	359
1929	221
1930	362
1931	217
1932	684
1933	710
1934	200
1935	87
1936	504
1937	379
1938	118
1939	1,126
1940	248
1941	261
1942	507
1943	444
1944	189
1945	621
1946	207
1947	258
1948	316
1949	296
1950	294
1951	773
1952	277
1953	283
1954	409
1955	419
1956	448
1957	686
1958	540
1959	548
1960	492
1961	911
1962	676
1963	531
1964	1,239
1965	482
1966	516
1967	1,121
1968	338
1969	238
1970	820
1971	781
1972	601
1973	1,016
1974	390
1975	474
1976	507
1977	1,024
1978	710
1979	951
1980	1,116
1981	1,354
1982	569
1983	1,264
1984	1,618
1985	1,210
1986	743
1987	1,191
1988	481
1989	2,905
1990	866
1991	577
1992	1,461
1993	761
1994	685
1995	956
1996	1,212
1997	1,279
1998	695
1999	901
2000	1,566
2001	1,262
2002	858
2003	751
2004	554
2005	806
2006	1,307
2007	1,100
2008	1,354
2009	926
2010	1,405
2011	430
2012	942
2013	718
2014	370
2015	1,378
2016	1,521
2017	408
2018	498
2019	917
2020	768
2021	908
2022	595
2023	931
2024	560
2025	1,198

Download the Data

Data for records on 1940-12-17: 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	207
200 to 400	1
400 to 600	1
600 to 800	1
800 to 1000	1
1000 to 1200	1