Weather Records on 21 December 1964

613 weather records were set or tied worldwide on 21 December 1964. Highest significance: Prosser, US.

Key Facts for 21 December 1964

On 21 December 1964, 613 weather records were set or tied at long-record stations worldwide.
148 were record highs and 106 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 17 monthly and 594 daily.
Prosser set a monthly record snow depth of 30.5 cm (12.0 in) on 21 December 1964.
Across 158 earlier years (1793 to 2025) the same calendar date averaged 489 records.

Record Map

613 stations

613 station records on 21 December 1964 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 December 1964: highest significance records shown on the map
Station	Country	Type	Value	Significance
Prosser	United States	Record snow depth	30.5 cm (12.0 in)	62 of 100 (Major)
Hood Rvr Exp STN	United States	Record snow depth	58.4 cm (23.0 in)	60 of 100 (Major)
Susanville 2SW	United States	Record daily precipitation	71.9 mm (2.8 in)	57 of 100 (Notable)
Mystic Lake	United States	Record daily snowfall	30.5 cm (12.0 in)	50 of 100 (Notable)
Fremont 5 NW	United States	Record daily precipitation	50.8 mm (2.0 in)	50 of 100 (Notable)
East Anaconda	United States	Record daily precipitation	31.8 mm (1.3 in)	48 of 100 (Notable)
Coeur D'Alene	United States	Record daily snowfall	30.5 cm (12.0 in)	47 of 100 (Notable)
Ephrata	United States	Record daily snowfall	15.2 cm (6.0 in)	47 of 100 (Notable)
Yellowstone Park Mammoth	United States	Record daily precipitation	33.5 mm (1.3 in)	47 of 100 (Notable)
The Dalles	United States	Record daily snowfall	30.0 cm (11.8 in)	46 of 100 (Notable)
Bickleton	United States	Record daily snowfall	35.6 cm (14.0 in)	46 of 100 (Notable)
Ukiah	United States	Record daily precipitation	107.4 mm (4.2 in)	45 of 100 (Notable)
Dufur	United States	Record daily snowfall	22.9 cm (9.0 in)	45 of 100 (Notable)
Fossil	United States	Record daily precipitation	33.8 mm (1.3 in)	45 of 100 (Notable)
Colfax	United States	Record daily precipitation	115.8 mm (4.6 in)	43 of 100 (Notable)
Estacada 2 SE	United States	Record daily precipitation	77.2 mm (3.0 in)	43 of 100 (Notable)
Goldendale	United States	Record daily snowfall	15.2 cm (6.0 in)	43 of 100 (Notable)
Sable Island	Canada	Record daily precipitation	51.3 mm (2.0 in)	42 of 100 (Notable)
Milan	Italy	Record high minimum temperature	7.6 C (45.7 F)	42 of 100 (Notable)
Hailey 3 NNW	United States	Record daily precipitation	33.3 mm (1.3 in)	42 of 100 (Notable)
Carway	Canada	Record daily snowfall	20.3 cm (8.0 in)	40 of 100 (Notable)
Prosser	United States	Record daily snowfall	17.8 cm (7.0 in)	40 of 100 (Notable)
Wilkawatt Post Office	Australia	Record daily precipitation	50.3 mm (2.0 in)	39 of 100 (Notable)
Calistoga	United States	Record daily precipitation	92.7 mm (3.6 in)	39 of 100 (Notable)
Lake 2 N	United States	Record daily precipitation	34.5 mm (1.4 in)	39 of 100 (Notable)
Milton Freewater	United States	Record snow depth	12.7 cm (5.0 in)	39 of 100 (Notable)
Paisley	United States	Record daily precipitation	31.8 mm (1.3 in)	39 of 100 (Notable)
Pleasant Valley	United States	Record daily snowfall	22.9 cm (9.0 in)	38 of 100 (Notable)
Corvallis State UNIV	United States	Record daily precipitation	55.4 mm (2.2 in)	37 of 100 (Notable)
Rock Creek	United States	Record daily snowfall	20.3 cm (8.0 in)	36 of 100 (Notable)
Gold Run 4 SW	United States	Record daily precipitation	102.9 mm (4.1 in)	35 of 100 (Notable)
Stevensville	United States	Record daily precipitation	25.9 mm (1.0 in)	35 of 100 (Notable)
Yerington	United States	Record high minimum temperature	5.0 C (41.0 F)	35 of 100 (Notable)
Friend	United States	Record daily snowfall	30.5 cm (12.0 in)	35 of 100 (Notable)
Sunnyside	United States	Record daily snowfall	17.8 cm (7.0 in)	35 of 100 (Notable)
Burquitlam Vancouver Golf Cour	Canada	Record daily snowfall	17.8 cm (7.0 in)	34 of 100 (Routine)
Upper Stewiacke	Canada	Record daily snowfall	15.0 cm (5.9 in)	34 of 100 (Routine)
Dickinson Exp STN	United States	Record snow depth	20.3 cm (8.0 in)	34 of 100 (Routine)
Newport	United States	Record daily precipitation	88.1 mm (3.5 in)	34 of 100 (Routine)
Glomfjord	Norway	Record daily precipitation	68.4 mm (2.7 in)	33 of 100 (Routine)
Las Plumas	United States	Record daily precipitation	156.2 mm (6.1 in)	33 of 100 (Routine)
Orleans	United States	Record daily precipitation	93.7 mm (3.7 in)	33 of 100 (Routine)
Boulia Airport	Australia	Record high minimum temperature	33.4 C (92.1 F)	32 of 100 (Routine)
Parkdale	United States	Record snow depth	68.6 cm (27.0 in)	32 of 100 (Routine)
Ephrata	United States	Record snow depth	30.5 cm (12.0 in)	32 of 100 (Routine)
Kalama 5 ENE	United States	Record daily snowfall	7.6 cm (3.0 in)	32 of 100 (Routine)
Leavenworth 3 S	United States	Record daily snowfall	30.2 cm (11.9 in)	32 of 100 (Routine)
Bond Springs Homestead	Australia	Record daily precipitation	29.7 mm (1.2 in)	31 of 100 (Routine)
James Island	Canada	Record daily snowfall	8.9 cm (3.5 in)	31 of 100 (Routine)
Steveston	Canada	Record daily snowfall	16.5 cm (6.5 in)	31 of 100 (Routine)
White Rock Campbell Scientific	Canada	Record daily snowfall	16.5 cm (6.5 in)	31 of 100 (Routine)
Wallace	United States	Record daily precipitation	40.9 mm (1.6 in)	31 of 100 (Routine)
Waterville	United States	Record daily snowfall	12.7 cm (5.0 in)	31 of 100 (Routine)
Westwold	Canada	Record daily snowfall	17.8 cm (7.0 in)	30 of 100 (Routine)
Truckee Rs	United States	Record daily precipitation	39.4 mm (1.6 in)	30 of 100 (Routine)
Bonners Ferry	United States	Record daily snowfall	12.7 cm (5.0 in)	30 of 100 (Routine)
Browning	United States	Record daily snowfall	12.7 cm (5.0 in)	30 of 100 (Routine)
Juana Diaz Camp	Puerto Rico [United States]	Record low maximum temperature	27.2 C (81.0 F)	29 of 100 (Routine)
Cummings	United States	Record daily precipitation	173.7 mm (6.8 in)	29 of 100 (Routine)
Lakeport	United States	Record daily precipitation	74.2 mm (2.9 in)	29 of 100 (Routine)

Counts by Type and Timescale

613 records

Records set or tied on 21 December 1964 by type: Highest daily maximum 34, Lowest daily maximum 64, Highest daily minimum 114, Lowest daily minimum 42, Heaviest daily rainfall 215, Heaviest daily snowfall 118, Deepest snow cover 26.

Records on 21 December 1964 by type
Record type	Records
Highest daily maximum	34
Lowest daily maximum	64
Highest daily minimum	114
Lowest daily minimum	42
Heaviest daily rainfall	215
Heaviest daily snowfall	118
Deepest snow cover	26

Records on 21 December 1964 by timescale: all-time 2, monthly 17, daily 594.

How Much Records Were Beaten By

513 broken records

Margins by which the 513 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 482.0. Ties are not counted.

Top 20 by Significance

21 December 1964

Top 20 records on 21 December 1964 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 December 1964	Prosser, US	monthly snow depth	30.5 cm (12.0 in)	15.3 cm (6.0 in)	33 years	62 of 100 (Major)
21 December 1964	Hood Rvr Exp STN, US	daily snow depth	58.4 cm (23.0 in)	48.2 cm (19.0 in)	51 years	60 of 100 (Major)
21 December 1964	Susanville 2SW, US	daily rain	71.9 mm (2.8 in)	41.4 mm (1.6 in)	51 years	57 of 100 (Notable)
21 December 1964	Mystic Lake, US	daily snowfall	30.5 cm (12.0 in)	22.6 cm (8.9 in)	23 years	50 of 100 (Notable)
21 December 1964	Fremont 5 NW, US	daily rain	50.8 mm (2.0 in)	42.9 mm (1.7 in)	17 years	50 of 100 (Notable)
21 December 1964	East Anaconda, US	daily rain	31.8 mm (1.3 in)	21.1 mm (0.8 in)	9 years	48 of 100 (Notable)
21 December 1964	Coeur D'Alene, US	daily snowfall	30.5 cm (12.0 in)	11.2 cm (4.4 in)	68 years	47 of 100 (Notable)
21 December 1964	Ephrata, US	daily snowfall	15.2 cm (6.0 in)	10.1 cm (4.0 in)	43 years	47 of 100 (Notable)
21 December 1964	Yellowstone Park Mammoth, US	daily rain	33.5 mm (1.3 in)	26.1 mm (1.0 in)	2 years	47 of 100 (Notable)
21 December 1964	The Dalles, US	daily snowfall	30.0 cm (11.8 in)	18.6 cm (7.3 in)	40 years	46 of 100 (Notable)
21 December 1964	Bickleton, US	monthly snowfall	35.6 cm (14.0 in)	12.7 cm (5.0 in)	21 years	46 of 100 (Notable)
21 December 1964	Ukiah, US	daily rain	107.4 mm (4.2 in)	30.4 mm (1.2 in)	69 years	45 of 100 (Notable)
21 December 1964	Dufur, US	daily snowfall	22.9 cm (9.0 in)	15.3 cm (6.0 in)	51 years	45 of 100 (Notable)
21 December 1964	Fossil, US	daily rain	33.8 mm (1.3 in)	18.8 mm (0.7 in)	9 years	45 of 100 (Notable)
21 December 1964	Colfax, US	daily rain	115.8 mm (4.6 in)	67.5 mm (2.7 in)	19 years	43 of 100 (Notable)
21 December 1964	Estacada 2 SE, US	daily rain	77.2 mm (3.0 in)	28.9 mm (1.1 in)	49 years	43 of 100 (Notable)
21 December 1964	Goldendale, US	daily snowfall	15.2 cm (6.0 in)	12.7 cm (5.0 in)	48 years	43 of 100 (Notable)
21 December 1964	Sable Island, CA	daily rain	51.3 mm (2.0 in)	24.9 mm (1.0 in)	36 years	42 of 100 (Notable)
21 December 1964	Milan, IT	daily high min	7.6 C (45.7 F)	0.8 C (1.4 F)	138 years	42 of 100 (Notable)
21 December 1964	Hailey 3 NNW, US	daily rain	33.3 mm (1.3 in)	21.4 mm (0.8 in)	38 years	42 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 1964

Records set or tied on this calendar date in each year from 1793 to 1964. 1964 had 613 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 1964-12-21: 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 2026-10-13 (13 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 100	485
100 to 200	23
200 to 300	4
300 to 400	0
400 to 500	1