Weather Records on 21 December 1963

1,137 weather records were set or tied worldwide on 21 December 1963. Highest significance: American Falls 6 NE, US.

Key Facts for 21 December 1963

On 21 December 1963, 1,137 weather records were set or tied at long-record stations worldwide.
61 were record highs and 832 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 46 monthly and 1,089 daily.
American Falls 6 NE set a daily record snowfall of 20.3 cm (8.0 in) on 21 December 1963.
Across 158 earlier years (1793 to 2025) the same calendar date averaged 485 records.

Record Map

1,137 stations

1,137 station records on 21 December 1963 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 December 1963: highest significance records shown on the map
Station	Country	Type	Value	Significance
American Falls 6 NE	United States	Record daily snowfall	20.3 cm (8.0 in)	59 of 100 (Notable)
Aberdeen Exp STN	United States	Record snow depth	30.5 cm (12.0 in)	48 of 100 (Notable)
Osijek	Croatia	Record daily precipitation	35.0 mm (1.4 in)	47 of 100 (Notable)
Portland	United States	Record daily snowfall	12.7 cm (5.0 in)	46 of 100 (Notable)
Acude Rio Do Peixe	Brazil	Record daily precipitation	68.5 mm (2.7 in)	45 of 100 (Notable)
Usina Bananeiras (Caeeb)	Brazil	Record daily precipitation	133.2 mm (5.2 in)	45 of 100 (Notable)
Cicero Dantas	Brazil	Record daily precipitation	96.7 mm (3.8 in)	41 of 100 (Notable)
Osceola	United States	Record low maximum temperature	-18.3 C (-0.9 F)	40 of 100 (Notable)
Tranebjerg	Denmark	Record low minimum temperature	-10.7 C (12.7 F)	39 of 100 (Notable)
Penrose	United States	Record daily snowfall	10.2 cm (4.0 in)	39 of 100 (Notable)
Greenville	United States	Record daily snowfall	7.6 cm (3.0 in)	39 of 100 (Notable)
Galesburg	United States	Record low minimum temperature	-30.0 C (-22.0 F)	38 of 100 (Notable)
Picos	Brazil	Record daily precipitation	70.0 mm (2.8 in)	37 of 100 (Notable)
Simao Dias (Anapolis)	Brazil	Record daily precipitation	81.0 mm (3.2 in)	37 of 100 (Notable)
Sedalia Wtp	United States	Record low maximum temperature	-13.3 C (8.1 F)	37 of 100 (Notable)
Ponca City	United States	Record daily snowfall	5.1 cm (2.0 in)	37 of 100 (Notable)
Muskegon Co AP	United States	Record snow depth	78.7 cm (31.0 in)	37 of 100 (Notable)
Galesburg	United States	Record low maximum temperature	-17.2 C (1.0 F)	36 of 100 (Notable)
Watseka Public Works	United States	Record low minimum temperature	-27.8 C (-18.0 F)	35 of 100 (Notable)
Crawfordsville Pwr Plt	United States	Record low maximum temperature	-14.4 C (6.1 F)	35 of 100 (Notable)
Osceola	United States	Record low minimum temperature	-26.1 C (-15.0 F)	35 of 100 (Notable)
Sharon Springs	United States	Record daily snowfall	5.1 cm (2.0 in)	35 of 100 (Notable)
Enterprise	United States	Record daily snowfall	7.6 cm (3.0 in)	35 of 100 (Notable)
Frei Paulo	Brazil	Record daily precipitation	74.0 mm (2.9 in)	34 of 100 (Routine)
Deerfield 10 NNW	United States	Record daily snowfall	12.7 cm (5.0 in)	34 of 100 (Routine)
Pearl	United States	Record daily snowfall	6.4 cm (2.5 in)	34 of 100 (Routine)
Ogdensburg 4 NE	United States	Record snow depth	15.2 cm (6.0 in)	34 of 100 (Routine)
Elk City 4 W	United States	Record low maximum temperature	-6.7 C (19.9 F)	34 of 100 (Routine)
Fillmore	United States	Record snow depth	17.8 cm (7.0 in)	34 of 100 (Routine)
Rantoul	United States	Record low minimum temperature	-25.6 C (-14.1 F)	34 of 100 (Routine)
Krasnyj Chikoj	Russia	Record high minimum temperature	-8.2 C (17.2 F)	33 of 100 (Routine)
Trinidad	United States	Record daily snowfall	17.8 cm (7.0 in)	33 of 100 (Routine)
Bloomington Normal	United States	Record low minimum temperature	-25.6 C (-14.1 F)	33 of 100 (Routine)
W Lafayette 6 NW	United States	Record low maximum temperature	-16.1 C (3.0 F)	33 of 100 (Routine)
St Charles Elm Pt	United States	Record low minimum temperature	-23.3 C (-9.9 F)	33 of 100 (Routine)
Colorado City	United States	Record low maximum temperature	0.0 C (32.0 F)	33 of 100 (Routine)
Mexia	United States	Record daily snowfall	5.1 cm (2.0 in)	33 of 100 (Routine)
Sulphur Springs	United States	Record low maximum temperature	0.0 C (32.0 F)	33 of 100 (Routine)
Springfield Abraham Lincoln Ca	United States	Record low minimum temperature	-23.9 C (-11.0 F)	33 of 100 (Routine)
Atlin	Canada	Record daily snowfall	10.2 cm (4.0 in)	32 of 100 (Routine)
Freiburg	Germany	Record low maximum temperature	-6.8 C (19.8 F)	32 of 100 (Routine)
Shahat	Libya	Record high maximum temperature	28.9 C (84.0 F)	32 of 100 (Routine)
Irkutsk	Russia	Record high maximum temperature	1.0 C (33.8 F)	32 of 100 (Routine)
Camden 1	United States	Record daily snowfall	5.1 cm (2.0 in)	32 of 100 (Routine)
Holly	United States	Record daily snowfall	12.7 cm (5.0 in)	32 of 100 (Routine)
Norwood	United States	Record daily snowfall	13.2 cm (5.2 in)	32 of 100 (Routine)
Carlinville	United States	Record low minimum temperature	-23.3 C (-9.9 F)	32 of 100 (Routine)
Delphi 2 N	United States	Record low minimum temperature	-27.2 C (-17.0 F)	32 of 100 (Routine)
Salem	United States	Record low maximum temperature	-11.1 C (12.0 F)	32 of 100 (Routine)
Vincennes 4 E	United States	Record low minimum temperature	-20.0 C (-4.0 F)	32 of 100 (Routine)
W Lafayette 6 NW	United States	Record low minimum temperature	-26.7 C (-16.1 F)	32 of 100 (Routine)
Hugoton	United States	Record daily snowfall	15.2 cm (6.0 in)	32 of 100 (Routine)
Schriever	United States	Record low maximum temperature	4.4 C (39.9 F)	32 of 100 (Routine)
Alton	Canada	Record low minimum temperature	-26.1 C (-15.0 F)	31 of 100 (Routine)
Idaho Springs	United States	Record daily snowfall	15.2 cm (6.0 in)	31 of 100 (Routine)
Blackfoot Fire Dept	United States	Record daily snowfall	22.9 cm (9.0 in)	31 of 100 (Routine)
Decatur Wtp	United States	Record low minimum temperature	-24.4 C (-11.9 F)	31 of 100 (Routine)
Hillsboro	United States	Record low minimum temperature	-22.8 C (-9.0 F)	31 of 100 (Routine)
Morrison	United States	Record low minimum temperature	-31.7 C (-25.1 F)	31 of 100 (Routine)
Watseka Public Works	United States	Record low maximum temperature	-13.3 C (8.1 F)	31 of 100 (Routine)

Counts by Type and Timescale

1,137 records

Records set or tied on 21 December 1963 by type: Highest daily maximum 36, Lowest daily maximum 512, Highest daily minimum 25, Lowest daily minimum 320, Heaviest daily rainfall 126, Heaviest daily snowfall 77, Deepest snow cover 41.

Records on 21 December 1963 by type
Record type	Records
Highest daily maximum	36
Lowest daily maximum	512
Highest daily minimum	25
Lowest daily minimum	320
Heaviest daily rainfall	126
Heaviest daily snowfall	77
Deepest snow cover	41

Records on 21 December 1963 by timescale: all-time 2, monthly 46, daily 1,089.

How Much Records Were Beaten By

934 broken records

Margins by which the 934 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 228.0. Ties are not counted.

Top 20 by Significance

21 December 1963

Top 20 records on 21 December 1963 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 December 1963	American Falls 6 NE, US	daily snowfall	20.3 cm (8.0 in)	12.7 cm (5.0 in)	67 years	59 of 100 (Notable)
21 December 1963	Aberdeen Exp STN, US	daily snow depth	30.5 cm (12.0 in)	17.8 cm (7.0 in)	41 years	48 of 100 (Notable)
21 December 1963	Osijek, HR	daily rain	35.0 mm (1.4 in)	28.6 mm (1.1 in)	4 years	47 of 100 (Notable)
21 December 1963	Portland, US	daily snowfall	12.7 cm (5.0 in)	12.7 cm (5.0 in)	53 years	46 of 100 (Notable)
21 December 1963	Acude Rio Do Peixe, BR	daily rain	68.5 mm (2.7 in)	44.0 mm (1.7 in)	26 years	45 of 100 (Notable)
21 December 1963	Usina Bananeiras (Caeeb), BR	daily rain	133.2 mm (5.2 in)	112.4 mm (4.4 in)	6 years	45 of 100 (Notable)
21 December 1963	Cicero Dantas, BR	monthly rain	96.7 mm (3.8 in)	21.4 mm (0.8 in)	35 years	41 of 100 (Notable)
21 December 1963	Osceola, US	monthly low max	-18.3 C (-0.9 F)	2.7 C (4.9 F)	64 years	40 of 100 (Notable)
21 December 1963	Tranebjerg, DK	daily low min	-10.7 C (12.7 F)	1.8 C (3.2 F)	84 years	39 of 100 (Notable)
21 December 1963	Penrose, US	daily snowfall	10.2 cm (4.0 in)	10.2 cm (4.0 in)	38 years	39 of 100 (Notable)
21 December 1963	Greenville, US	daily snowfall	7.6 cm (3.0 in)	7.6 cm (3.0 in)	60 years	39 of 100 (Notable)
21 December 1963	Galesburg, US	monthly low min	-30.0 C (-22.0 F)	2.8 C (5.0 F)	61 years	38 of 100 (Notable)
21 December 1963	Picos, BR	daily rain	70.0 mm (2.8 in)	30.6 mm (1.2 in)	52 years	37 of 100 (Notable)
21 December 1963	Simao Dias (Anapolis), BR	monthly rain	81.0 mm (3.2 in)	14.6 mm (0.6 in)	40 years	37 of 100 (Notable)
21 December 1963	Sedalia Wtp, US	monthly low max	-13.3 C (8.1 F)	1.1 C (2.0 F)	66 years	37 of 100 (Notable)
21 December 1963	Ponca City, US	daily snowfall	5.1 cm (2.0 in)	5.1 cm (2.0 in)	68 years	37 of 100 (Notable)
21 December 1963	Muskegon Co AP, US	daily snow depth	78.7 cm (31.0 in)	22.8 cm (9.0 in)	46 years	37 of 100 (Notable)
21 December 1963	Galesburg, US	monthly low max	-17.2 C (1.0 F)	1.6 C (2.9 F)	62 years	36 of 100 (Notable)
21 December 1963	Watseka Public Works, US	daily low min	-27.8 C (-18.0 F)	6.7 C (12.1 F)	61 years	35 of 100 (Notable)
21 December 1963	Crawfordsville Pwr Plt, US	daily low max	-14.4 C (6.1 F)	6.6 C (11.9 F)	61 years	35 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 1963

Records set or tied on this calendar date in each year from 1793 to 1963. 1963 had 1,137 records.

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

Records on 12-21 in each year
Year	Records
1793	1
1794	1
1799	1
1801	2
1808	3
1825	1
1828	1
1839	1
1846	1
1850	1
1855	7
1859	1
1860	1
1868	1
1870	1
1871	2
1874	2
1875	3
1876	1
1877	1
1878	1
1879	1
1880	1
1884	1
1886	3
1889	1
1890	4
1893	4
1894	1
1895	5
1896	3
1897	3
1898	1
1900	8
1901	15
1902	5
1903	25
1904	3
1905	15
1906	15
1907	17
1908	19
1909	20
1910	29
1911	36
1912	23
1913	11
1914	107
1915	43
1916	40
1917	18
1918	41
1919	57
1920	30
1921	104
1922	34
1923	323
1924	377
1925	120
1926	178
1927	147
1928	70
1929	156
1930	66
1931	556
1932	150
1933	581
1934	230
1935	398
1936	323
1937	189
1938	145
1939	140
1940	622
1941	651
1942	968
1943	148
1944	762
1945	396
1946	495
1947	700
1948	297
1949	1,281
1950	504
1951	1,061
1952	197
1953	256
1954	444
1955	888
1956	672
1957	846
1958	516
1959	272
1960	585
1961	254
1962	563
1963	1,137
1964	613
1965	247
1966	400
1967	1,923
1968	818
1969	828
1970	547
1971	680
1972	651
1973	1,292
1974	374
1975	548
1976	446
1977	470
1978	517
1979	558
1980	726
1981	1,476
1982	702
1983	3,324
1984	1,012
1985	979
1986	404
1987	775
1988	717
1989	3,203
1990	2,701
1991	1,125
1992	751
1993	967
1994	793
1995	878
1996	1,114
1997	810
1998	1,142
1999	851
2000	944
2001	650
2002	579
2003	1,103
2004	675
2005	606
2006	1,443
2007	946
2008	1,062
2009	1,097
2010	2,039
2011	653
2012	759
2013	1,029
2014	878
2015	1,173
2016	543
2017	459
2018	742
2019	755
2020	965
2021	323
2022	528
2023	1,170
2024	778
2025	1,099

Download the Data

Data for records on 1963-12-21: 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Margin	Records
0 to 50	883
50 to 100	40
100 to 150	7
150 to 200	3
200 to 250	1