Weather Records on 20 December 1966

555 weather records were set or tied worldwide on 20 December 1966. Highest significance: Vulcan, CA.

Key Facts for 20 December 1966

On 20 December 1966, 555 weather records were set or tied at long-record stations worldwide.
239 were record highs and 47 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 15 monthly and 540 daily.
Vulcan set a monthly record daily precipitation of 30.5 mm (1.2 in) on 20 December 1966.
Across 163 earlier years (1793 to 2025) the same calendar date averaged 467 records.

Record Map

555 stations

555 station records on 20 December 1966 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 December 1966: highest significance records shown on the map
Station	Country	Type	Value	Significance
Vulcan	Canada	Record daily precipitation	30.5 mm (1.2 in)	59 of 100 (Notable)
Vulcan	Canada	Record daily snowfall	30.5 cm (12.0 in)	59 of 100 (Notable)
Madanapalli	India	Record daily precipitation	67.0 mm (2.6 in)	52 of 100 (Notable)
Chatrapatti	India	Record daily precipitation	72.0 mm (2.8 in)	52 of 100 (Notable)
Emerson	Canada	Record daily snowfall	10.2 cm (4.0 in)	49 of 100 (Notable)
Morden	Canada	Record daily snowfall	22.1 cm (8.7 in)	49 of 100 (Notable)
Tygerfontein	South Africa	Record daily precipitation	70.5 mm (2.8 in)	48 of 100 (Notable)
Palani	India	Record daily precipitation	50.6 mm (2.0 in)	46 of 100 (Notable)
Catharinasvlei	South Africa	Record daily precipitation	67.0 mm (2.6 in)	45 of 100 (Notable)
Afogados da Ingazeira (Dnocs)	Brazil	Record daily precipitation	65.6 mm (2.6 in)	44 of 100 (Notable)
Fielden	South Africa	Record daily precipitation	46.0 mm (1.8 in)	44 of 100 (Notable)
Budapest	Hungary	Record daily precipitation	29.6 mm (1.2 in)	43 of 100 (Notable)
Morokweng (Pol)	South Africa	Record daily precipitation	35.0 mm (1.4 in)	43 of 100 (Notable)
Valapady	India	Record daily precipitation	56.0 mm (2.2 in)	42 of 100 (Notable)
Western 2W	United States	Record daily snowfall	10.2 cm (4.0 in)	41 of 100 (Notable)
Cheyyar	India	Record daily precipitation	82.0 mm (3.2 in)	40 of 100 (Notable)
Propria	Brazil	Record daily precipitation	43.4 mm (1.7 in)	38 of 100 (Notable)
Fort McPherson	Canada	Record daily snowfall	7.6 cm (3.0 in)	38 of 100 (Notable)
Ulundurpet	India	Record daily precipitation	59.4 mm (2.3 in)	38 of 100 (Notable)
Cuddalore	India	Record daily precipitation	128.1 mm (5.0 in)	37 of 100 (Notable)
Klaarstroom (Pol)	South Africa	Record daily precipitation	27.5 mm (1.1 in)	37 of 100 (Notable)
Palacode	India	Record daily precipitation	30.0 mm (1.2 in)	36 of 100 (Notable)
Vaalbank	South Africa	Record daily precipitation	55.5 mm (2.2 in)	36 of 100 (Notable)
Grand Forks UNIV (NWS)	United States	Record daily snowfall	8.6 cm (3.4 in)	36 of 100 (Notable)
Phoenixville 1 E	United States	Record daily snowfall	21.6 cm (8.5 in)	34 of 100 (Routine)
Drumheller	Canada	Record daily snowfall	8.9 cm (3.5 in)	33 of 100 (Routine)
Delmas (Pol)	South Africa	Record daily precipitation	56.6 mm (2.2 in)	33 of 100 (Routine)
Kvikkjokk-Arrenjarka	Sweden	Record snow depth	100.0 cm (39.4 in)	33 of 100 (Routine)
Yates Ctr	United States	Record high maximum temperature	20.6 C (69.1 F)	33 of 100 (Routine)
Guthrie 5S	United States	Record high maximum temperature	23.9 C (75.0 F)	33 of 100 (Routine)
Fredrikstad (Sar)	South Africa	Record daily precipitation	40.0 mm (1.6 in)	32 of 100 (Routine)
Healdton 3 E	United States	Record high maximum temperature	23.9 C (75.0 F)	32 of 100 (Routine)
Simplicio Mendes	Brazil	Record daily precipitation	65.1 mm (2.6 in)	31 of 100 (Routine)
Rusel-Irlmoos	Germany	Record daily precipitation	57.4 mm (2.3 in)	31 of 100 (Routine)
Purcell 2 SW	United States	Record high maximum temperature	23.3 C (73.9 F)	31 of 100 (Routine)
Shawano 2SSW	United States	Record daily snowfall	12.7 cm (5.0 in)	31 of 100 (Routine)
Sivaganga	India	Record daily precipitation	26.0 mm (1.0 in)	30 of 100 (Routine)
Jamestown State Hosp	United States	Record high minimum temperature	-1.7 C (28.9 F)	30 of 100 (Routine)
Bowie	United States	Record high maximum temperature	24.4 C (75.9 F)	30 of 100 (Routine)
Sonnblick	Austria	Record daily precipitation	33.1 mm (1.3 in)	29 of 100 (Routine)
Porto Real Do Colegio	Brazil	Record daily precipitation	32.2 mm (1.3 in)	29 of 100 (Routine)
Tittagudi	India	Record daily precipitation	46.0 mm (1.8 in)	29 of 100 (Routine)
Dindigul	India	Record daily precipitation	30.0 mm (1.2 in)	29 of 100 (Routine)
Palmerton	United States	Record daily snowfall	17.3 cm (6.8 in)	29 of 100 (Routine)
Andarai	Brazil	Record daily precipitation	80.8 mm (3.2 in)	28 of 100 (Routine)
Araci	Brazil	Record daily precipitation	45.0 mm (1.8 in)	28 of 100 (Routine)
Gingee	India	Record daily precipitation	74.9 mm (2.9 in)	28 of 100 (Routine)
Roodepoort (Mun)	South Africa	Record daily precipitation	36.5 mm (1.4 in)	28 of 100 (Routine)
Springs (Rwb)	South Africa	Record daily precipitation	31.0 mm (1.2 in)	28 of 100 (Routine)
St Charles Elm Pt	United States	Record high maximum temperature	17.2 C (63.0 F)	28 of 100 (Routine)
Wibaux 2 E	United States	Record high minimum temperature	0.0 C (32.0 F)	28 of 100 (Routine)
Anadarko 3 E	United States	Record high maximum temperature	24.4 C (75.9 F)	28 of 100 (Routine)
El Reno 1 N	United States	Record high maximum temperature	22.8 C (73.0 F)	28 of 100 (Routine)
Liffey	Australia	Record daily precipitation	34.3 mm (1.4 in)	27 of 100 (Routine)
Van Reenen	South Africa	Record daily precipitation	59.0 mm (2.3 in)	27 of 100 (Routine)
Howard 2SE	United States	Record high maximum temperature	21.1 C (70.0 F)	27 of 100 (Routine)
Pendencias	Brazil	Record daily precipitation	35.3 mm (1.4 in)	26 of 100 (Routine)
Three Hills	Canada	Record daily snowfall	20.3 cm (8.0 in)	26 of 100 (Routine)
Morden Cda	Canada	Record daily snowfall	22.1 cm (8.7 in)	26 of 100 (Routine)
Woudzicht	South Africa	Record daily precipitation	54.5 mm (2.1 in)	26 of 100 (Routine)

Counts by Type and Timescale

555 records

Records set or tied on 20 December 1966 by type: Highest daily maximum 136, Lowest daily maximum 18, Highest daily minimum 103, Lowest daily minimum 29, Heaviest daily rainfall 215, Heaviest daily snowfall 50, Deepest snow cover 4.

Records on 20 December 1966 by type
Record type	Records
Highest daily maximum	136
Lowest daily maximum	18
Highest daily minimum	103
Lowest daily minimum	29
Heaviest daily rainfall	215
Heaviest daily snowfall	50
Deepest snow cover	4

Records on 20 December 1966 by timescale: all-time 0, monthly 15, daily 540.

How Much Records Were Beaten By

460 broken records

Margins by which the 460 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 170.0. Ties are not counted.

Top 20 by Significance

20 December 1966

Top 20 records on 20 December 1966 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 December 1966	Vulcan, CA	monthly rain	30.5 mm (1.2 in)	14.0 mm (0.6 in)	16 years	59 of 100 (Notable)
20 December 1966	Vulcan, CA	monthly snowfall	30.5 cm (12.0 in)	14.0 cm (5.5 in)	16 years	59 of 100 (Notable)
20 December 1966	Madanapalli, IN	daily rain	67.0 mm (2.6 in)	57.6 mm (2.3 in)	24 years	52 of 100 (Notable)
20 December 1966	Chatrapatti, IN	daily rain	72.0 mm (2.8 in)	57.0 mm (2.2 in)	52 years	52 of 100 (Notable)
20 December 1966	Emerson, CA	daily snowfall	10.2 cm (4.0 in)	7.7 cm (3.0 in)	87 years	49 of 100 (Notable)
20 December 1966	Morden, CA	daily snowfall	22.1 cm (8.7 in)	11.9 cm (4.7 in)	53 years	49 of 100 (Notable)
20 December 1966	Tygerfontein, ZA	daily rain	70.5 mm (2.8 in)	50.9 mm (2.0 in)	28 years	48 of 100 (Notable)
20 December 1966	Palani, IN	daily rain	50.6 mm (2.0 in)	44.5 mm (1.8 in)	52 years	46 of 100 (Notable)
20 December 1966	Catharinasvlei, ZA	daily rain	67.0 mm (2.6 in)	38.3 mm (1.5 in)	25 years	45 of 100 (Notable)
20 December 1966	Afogados da Ingazeira (Dnocs), BR	daily rain	65.6 mm (2.6 in)	55.5 mm (2.2 in)	28 years	44 of 100 (Notable)
20 December 1966	Fielden, ZA	daily rain	46.0 mm (1.8 in)	34.3 mm (1.4 in)	36 years	44 of 100 (Notable)
20 December 1966	Budapest, HU	daily rain	29.6 mm (1.2 in)	13.3 mm (0.5 in)	31 years	43 of 100 (Notable)
20 December 1966	Morokweng (Pol), ZA	daily rain	35.0 mm (1.4 in)	29.2 mm (1.1 in)	25 years	43 of 100 (Notable)
20 December 1966	Valapady, IN	daily rain	56.0 mm (2.2 in)	40.0 mm (1.6 in)	24 years	42 of 100 (Notable)
20 December 1966	Western 2W, US	daily snowfall	10.2 cm (4.0 in)	10.2 cm (4.0 in)	56 years	41 of 100 (Notable)
20 December 1966	Cheyyar, IN	daily rain	82.0 mm (3.2 in)	51.5 mm (2.0 in)	63 years	40 of 100 (Notable)
20 December 1966	Propria, BR	daily rain	43.4 mm (1.7 in)	39.0 mm (1.5 in)	20 years	38 of 100 (Notable)
20 December 1966	Fort McPherson, CA	daily snowfall	7.6 cm (3.0 in)	5.1 cm (2.0 in)	52 years	38 of 100 (Notable)
20 December 1966	Ulundurpet, IN	daily rain	59.4 mm (2.3 in)	41.6 mm (1.6 in)	63 years	38 of 100 (Notable)
20 December 1966	Cuddalore, IN	daily rain	128.1 mm (5.0 in)	81.1 mm (3.2 in)	31 years	37 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 1966

Records set or tied on this calendar date in each year from 1793 to 1966. 1966 had 555 records.

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

Records on 12-20 in each year
Year	Records
1793	1
1795	1
1804	1
1805	2
1808	1
1815	1
1828	1
1837	1
1846	1
1855	8
1858	1
1860	1
1866	1
1867	1
1868	1
1869	1
1871	2
1874	3
1875	1
1877	2
1878	1
1879	1
1880	1
1881	1
1882	1
1884	4
1885	1
1886	4
1889	4
1890	2
1891	2
1892	1
1894	2
1895	8
1896	1
1897	4
1898	2
1899	1
1900	7
1901	8
1902	14
1903	17
1904	9
1905	5
1906	5
1907	11
1908	5
1909	22
1910	17
1911	24
1912	27
1913	7
1914	43
1915	18
1916	45
1917	33
1918	18
1919	25
1920	22
1921	101
1922	88
1923	215
1924	332
1925	96
1926	163
1927	200
1928	93
1929	256
1930	67
1931	536
1932	170
1933	492
1934	265
1935	152
1936	416
1937	181
1938	240
1939	308
1940	965
1941	633
1942	817
1943	193
1944	340
1945	430
1946	327
1947	385
1948	345
1949	1,141
1950	758
1951	926
1952	394
1953	385
1954	416
1955	726
1956	471
1957	1,354
1958	382
1959	142
1960	354
1961	369
1962	475
1963	875
1964	499
1965	353
1966	555
1967	1,370
1968	482
1969	514
1970	518
1971	441
1972	448
1973	1,184
1974	328
1975	610
1976	382
1977	484
1978	910
1979	600
1980	667
1981	1,681
1982	712
1983	2,995
1984	1,411
1985	1,035
1986	321
1987	1,179
1988	760
1989	1,812
1990	1,885
1991	1,172
1992	1,134
1993	1,266
1994	813
1995	1,128
1996	1,448
1997	651
1998	1,110
1999	938
2000	1,150
2001	523
2002	943
2003	1,315
2004	836
2005	515
2006	1,387
2007	986
2008	1,356
2009	1,502
2010	2,055
2011	846
2012	1,131
2013	584
2014	524
2015	1,238
2016	603
2017	688
2018	592
2019	731
2020	554
2021	442
2022	567
2023	1,242
2024	897
2025	1,166

Download the Data

Data for records on 1966-12-20: 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 25	406
25 to 50	29
50 to 75	15
75 to 100	5
100 to 125	3
125 to 150	1
150 to 175	1