Weather Records on 17 December 1970

820 weather records were set or tied worldwide on 17 December 1970. Highest significance: Morgan, US.

Key Facts for 17 December 1970

On 17 December 1970, 820 weather records were set or tied at long-record stations worldwide.
80 were record highs and 44 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 13 monthly and 806 daily.
Morgan set an all-time record daily snowfall of 53.3 cm (21.0 in) on 17 December 1970.
Across 160 earlier years (1793 to 2025) the same calendar date averaged 461 records.

Record Map

820 stations

820 station records on 17 December 1970 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 December 1970: highest significance records shown on the map
Station	Country	Type	Value	Significance
Morgan	United States	Record daily snowfall	53.3 cm (21.0 in)	78 of 100 (Major)
Canton 4 SE	United States	Record daily snowfall	34.0 cm (13.4 in)	68 of 100 (Major)
Cumbalum (Fairview)	Australia	Record daily precipitation	88.1 mm (3.5 in)	65 of 100 (Major)
Dillon	United States	Record daily precipitation	50.3 mm (2.0 in)	65 of 100 (Major)
Tiger Creek Ph	United States	Record daily snowfall	27.9 cm (11.0 in)	58 of 100 (Notable)
Groton	United States	Record daily snowfall	25.4 cm (10.0 in)	57 of 100 (Notable)
Sierraville Rs	United States	Record daily snowfall	36.8 cm (14.5 in)	55 of 100 (Notable)
Wellsboro 4 SW	United States	Record daily snowfall	22.9 cm (9.0 in)	55 of 100 (Notable)
Rimini 2 SSW	United States	Record daily precipitation	76.2 mm (3.0 in)	55 of 100 (Notable)
Portola	United States	Record daily snowfall	40.6 cm (16.0 in)	53 of 100 (Notable)
Boston	United States	Record daily precipitation	71.6 mm (2.8 in)	53 of 100 (Notable)
Sorel	Canada	Record daily snowfall	38.1 cm (15.0 in)	52 of 100 (Notable)
Canton 4 SE	United States	Record daily precipitation	26.7 mm (1.1 in)	52 of 100 (Notable)
Coalville	United States	Record daily snowfall	40.6 cm (16.0 in)	52 of 100 (Notable)
Addison	United States	Record daily snowfall	25.4 cm (10.0 in)	51 of 100 (Notable)
Alexandria Bay 1 SW	United States	Record daily precipitation	38.6 mm (1.5 in)	51 of 100 (Notable)
Williamston 1 E	United States	Record daily precipitation	43.7 mm (1.7 in)	51 of 100 (Notable)
Little Falls City Rsch	United States	Record daily snowfall	25.4 cm (10.0 in)	50 of 100 (Notable)
Le Roy	United States	Record daily snowfall	25.4 cm (10.0 in)	50 of 100 (Notable)
Camden 3 W	United States	Record daily precipitation	48.0 mm (1.9 in)	50 of 100 (Notable)
Echo Dam	United States	Record daily snowfall	22.9 cm (9.0 in)	49 of 100 (Notable)
St Hyacinthe	Canada	Record daily snowfall	31.0 cm (12.2 in)	48 of 100 (Notable)
Challis	United States	Record snow depth	15.2 cm (6.0 in)	47 of 100 (Notable)
Woodstown Pittsgrov 4E	United States	Record daily precipitation	35.8 mm (1.4 in)	47 of 100 (Notable)
Baldwinsville	United States	Record daily precipitation	37.6 mm (1.5 in)	47 of 100 (Notable)
Alexandria Bay 1 SW	United States	Record daily snowfall	35.6 cm (14.0 in)	46 of 100 (Notable)
Gouverneur 3 NW	United States	Record daily snowfall	30.5 cm (12.0 in)	46 of 100 (Notable)
Little Falls City Rsch	United States	Record snow depth	58.4 cm (23.0 in)	46 of 100 (Notable)
Tarboro 1 S	United States	Record daily precipitation	40.1 mm (1.6 in)	46 of 100 (Notable)
Hollisterville	United States	Record daily snowfall	19.8 cm (7.8 in)	46 of 100 (Notable)
Cheraw	United States	Record daily precipitation	55.6 mm (2.2 in)	46 of 100 (Notable)
Sumter	United States	Record daily precipitation	57.2 mm (2.3 in)	46 of 100 (Notable)
Aniak AP	United States	Record daily snowfall	14.0 cm (5.5 in)	46 of 100 (Notable)
Warroad	United States	Record daily snowfall	12.7 cm (5.0 in)	45 of 100 (Notable)
Moorestown 4 E	United States	Record daily precipitation	37.8 mm (1.5 in)	45 of 100 (Notable)
Mays Point Lock 25	United States	Record daily precipitation	32.3 mm (1.3 in)	45 of 100 (Notable)
Kingstree	United States	Record daily precipitation	57.2 mm (2.3 in)	45 of 100 (Notable)
Tahoe City	United States	Record daily snowfall	76.2 cm (30.0 in)	44 of 100 (Notable)
Haverhill	United States	Record daily precipitation	45.0 mm (1.8 in)	44 of 100 (Notable)
Elmira	United States	Record daily snowfall	22.9 cm (9.0 in)	44 of 100 (Notable)
Ithaca Cornell UNIV	United States	Record daily snowfall	20.3 cm (8.0 in)	44 of 100 (Notable)
Little Falls Mill St	United States	Record daily snowfall	27.9 cm (11.0 in)	44 of 100 (Notable)
Clinton 2 S	United States	Record daily precipitation	47.2 mm (1.9 in)	44 of 100 (Notable)
Epping	United States	Record daily snowfall	5.1 cm (2.0 in)	44 of 100 (Notable)
Lake City 2 SE	United States	Record daily precipitation	64.0 mm (2.5 in)	44 of 100 (Notable)
St Hyacinthe	Canada	Record daily precipitation	31.0 mm (1.2 in)	43 of 100 (Notable)
Port Hastings	Canada	Record daily precipitation	32.3 mm (1.3 in)	43 of 100 (Notable)
Nashua 2 NNW	United States	Record daily snowfall	15.2 cm (6.0 in)	43 of 100 (Notable)
Wadesboro	United States	Record daily precipitation	43.2 mm (1.7 in)	43 of 100 (Notable)
Sorel	Canada	Record daily precipitation	38.1 mm (1.5 in)	42 of 100 (Notable)
La Pocatiere Cda	Canada	Record daily snowfall	29.2 cm (11.5 in)	42 of 100 (Notable)
Mineral	United States	Record daily snowfall	44.5 cm (17.5 in)	42 of 100 (Notable)
Twin Lakes	United States	Record daily precipitation	91.4 mm (3.6 in)	42 of 100 (Notable)
Hyannis	United States	Record daily precipitation	45.5 mm (1.8 in)	42 of 100 (Notable)
Jiggs 3 N	United States	Record daily snowfall	20.3 cm (8.0 in)	42 of 100 (Notable)
Morrisville 6 SW	United States	Record daily snowfall	20.3 cm (8.0 in)	42 of 100 (Notable)
Galeton	United States	Record daily snowfall	19.1 cm (7.5 in)	42 of 100 (Notable)
Goldsboro 4 SE	United States	Record daily precipitation	39.4 mm (1.6 in)	42 of 100 (Notable)
Canton 4 SE	United States	Record snow depth	53.3 cm (21.0 in)	42 of 100 (Notable)
Arvida	Canada	Record daily snowfall	35.6 cm (14.0 in)	41 of 100 (Notable)

Counts by Type and Timescale

820 records

Records set or tied on 17 December 1970 by type: Highest daily maximum 25, Lowest daily maximum 19, Highest daily minimum 55, Lowest daily minimum 25, Heaviest daily rainfall 409, Heaviest daily snowfall 235, Deepest snow cover 52.

Records on 17 December 1970 by type
Record type	Records
Highest daily maximum	25
Lowest daily maximum	19
Highest daily minimum	55
Lowest daily minimum	25
Heaviest daily rainfall	409
Heaviest daily snowfall	235
Deepest snow cover	52

Records on 17 December 1970 by timescale: all-time 1, monthly 13, daily 806.

How Much Records Were Beaten By

719 broken records

Margins by which the 719 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 533.0. Ties are not counted.

Top 20 by Significance

17 December 1970

Top 20 records on 17 December 1970 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 December 1970	Morgan, US	all-time snowfall	53.3 cm (21.0 in)	20.3 cm (8.0 in)	53 years	78 of 100 (Major)
17 December 1970	Canton 4 SE, US	daily snowfall	34.0 cm (13.4 in)	23.8 cm (9.4 in)	72 years	68 of 100 (Major)
17 December 1970	Cumbalum (Fairview), AU	daily rain	88.1 mm (3.5 in)	54.6 mm (2.1 in)	84 years	65 of 100 (Major)
17 December 1970	Dillon, US	daily rain	50.3 mm (2.0 in)	46.0 mm (1.8 in)	65 years	65 of 100 (Major)
17 December 1970	Tiger Creek Ph, US	daily snowfall	27.9 cm (11.0 in)	22.8 cm (9.0 in)	61 years	58 of 100 (Notable)
17 December 1970	Groton, US	daily snowfall	25.4 cm (10.0 in)	24.1 cm (9.5 in)	70 years	57 of 100 (Notable)
17 December 1970	Sierraville Rs, US	daily snowfall	36.8 cm (14.5 in)	29.2 cm (11.5 in)	60 years	55 of 100 (Notable)
17 December 1970	Wellsboro 4 SW, US	daily snowfall	22.9 cm (9.0 in)	21.6 cm (8.5 in)	37 years	55 of 100 (Notable)
17 December 1970	Rimini 2 SSW, US	daily rain	76.2 mm (3.0 in)	44.4 mm (1.7 in)	47 years	55 of 100 (Notable)
17 December 1970	Portola, US	daily snowfall	40.6 cm (16.0 in)	30.4 cm (12.0 in)	48 years	53 of 100 (Notable)
17 December 1970	Boston, US	daily rain	71.6 mm (2.8 in)	50.8 mm (2.0 in)	33 years	53 of 100 (Notable)
17 December 1970	Sorel, CA	daily snowfall	38.1 cm (15.0 in)	30.5 cm (12.0 in)	25 years	52 of 100 (Notable)
17 December 1970	Canton 4 SE, US	daily rain	26.7 mm (1.1 in)	16.5 mm (0.6 in)	72 years	52 of 100 (Notable)
17 December 1970	Coalville, US	monthly snowfall	40.6 cm (16.0 in)	15.2 cm (6.0 in)	14 years	52 of 100 (Notable)
17 December 1970	Addison, US	daily snowfall	25.4 cm (10.0 in)	16.5 cm (6.5 in)	48 years	51 of 100 (Notable)
17 December 1970	Alexandria Bay 1 SW, US	daily rain	38.6 mm (1.5 in)	31.5 mm (1.2 in)	29 years	51 of 100 (Notable)
17 December 1970	Williamston 1 E, US	daily rain	43.7 mm (1.7 in)	35.6 mm (1.4 in)	28 years	51 of 100 (Notable)
17 December 1970	Little Falls City Rsch, US	daily snowfall	25.4 cm (10.0 in)	12.7 cm (5.0 in)	48 years	50 of 100 (Notable)
17 December 1970	Le Roy, US	daily snowfall	25.4 cm (10.0 in)	12.7 cm (5.0 in)	61 years	50 of 100 (Notable)
17 December 1970	Camden 3 W, US	daily rain	48.0 mm (1.9 in)	12.2 mm (0.5 in)	117 years	50 of 100 (Notable)

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 1970

Records set or tied on this calendar date in each year from 1793 to 1970. 1970 had 820 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 1970-12-17: 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 2026-10-16. Last revised 16 October 2026 (2026-10-16).

Margin	Records
0 to 100	628
100 to 200	70
200 to 300	16
300 to 400	4
400 to 500	0
500 to 600	1