Weather Records on 21 December 1966

400 weather records were set or tied worldwide on 21 December 1966. Highest significance: Eraniel, IN.

Key Facts for 21 December 1966

On 21 December 1966, 400 weather records were set or tied at long-record stations worldwide.
85 were record highs and 43 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 10 monthly and 388 daily.
Eraniel set a daily record precipitation of 75.7 mm (3.0 in) on 21 December 1966.
Across 158 earlier years (1793 to 2025) the same calendar date averaged 490 records.

Record Map

400 stations

400 station records on 21 December 1966 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 December 1966: highest significance records shown on the map
Station	Country	Type	Value	Significance
Eraniel	India	Record daily precipitation	75.7 mm (3.0 in)	58 of 100 (Notable)
Quakertown	United States	Record daily snowfall	20.8 cm (8.2 in)	54 of 100 (Notable)
Doylestown	United States	Record daily snowfall	20.3 cm (8.0 in)	52 of 100 (Notable)
Marayur	India	Record daily precipitation	72.0 mm (2.8 in)	51 of 100 (Notable)
W Chester 2 NW	United States	Record daily snowfall	25.4 cm (10.0 in)	50 of 100 (Notable)
Uppiliyapuram	India	Record daily precipitation	85.0 mm (3.3 in)	49 of 100 (Notable)
Flemington 5 NNW	United States	Record daily snowfall	24.1 cm (9.5 in)	48 of 100 (Notable)
Cabrobo	Brazil	Record daily precipitation	50.0 mm (2.0 in)	46 of 100 (Notable)
Jau (Cpef)	Brazil	Record daily precipitation	115.0 mm (4.5 in)	44 of 100 (Notable)
Attur	India	Record daily precipitation	66.4 mm (2.6 in)	44 of 100 (Notable)
Coatesville 1 SW	United States	Record daily snowfall	22.4 cm (8.8 in)	43 of 100 (Notable)
Conshohocken	United States	Record daily snowfall	17.8 cm (7.0 in)	43 of 100 (Notable)
Ariyalur	India	Record daily precipitation	84.8 mm (3.3 in)	39 of 100 (Notable)
Salto Grande (Cpfl)	Brazil	Record daily precipitation	96.2 mm (3.8 in)	38 of 100 (Notable)
Graterford	United States	Record daily snowfall	20.3 cm (8.0 in)	38 of 100 (Notable)
Bellrock	South Africa	Record daily precipitation	43.0 mm (1.7 in)	37 of 100 (Notable)
Mahlabatini (Mag)	South Africa	Record daily precipitation	116.2 mm (4.6 in)	37 of 100 (Notable)
Boonton 1 SE	United States	Record daily snowfall	12.7 cm (5.0 in)	37 of 100 (Notable)
Kodaikanal	India	Record daily precipitation	54.4 mm (2.1 in)	36 of 100 (Notable)
US.Macatuba-US.Lencois (Cpfl)	Brazil	Record daily precipitation	98.3 mm (3.9 in)	35 of 100 (Notable)
Traipu	Brazil	Record daily precipitation	100.0 mm (3.9 in)	35 of 100 (Notable)
Manyberries Cda	Canada	Record daily snowfall	16.5 cm (6.5 in)	35 of 100 (Notable)
Zeekoevlei	South Africa	Record daily precipitation	40.0 mm (1.6 in)	35 of 100 (Notable)
Catarina	Brazil	Record daily precipitation	82.3 mm (3.2 in)	34 of 100 (Routine)
New Brunswick Exp STN	United States	Record daily snowfall	7.6 cm (3.0 in)	34 of 100 (Routine)
Barras	Brazil	Record daily precipitation	68.6 mm (2.7 in)	33 of 100 (Routine)
Phillipsburg	United States	Record daily snowfall	10.2 cm (4.0 in)	33 of 100 (Routine)
Babbiloora Station	Australia	Record daily precipitation	42.7 mm (1.7 in)	32 of 100 (Routine)
Wandiwash	India	Record daily precipitation	67.0 mm (2.6 in)	32 of 100 (Routine)
Nilakottai	India	Record daily precipitation	36.2 mm (1.4 in)	32 of 100 (Routine)
Fall River	United States	Record daily snowfall	8.6 cm (3.4 in)	32 of 100 (Routine)
Pombal	Brazil	Record daily precipitation	35.8 mm (1.4 in)	31 of 100 (Routine)
Kvikkjokk-Arrenjarka	Sweden	Record snow depth	98.0 cm (38.6 in)	31 of 100 (Routine)
Dindigul	India	Record daily precipitation	62.0 mm (2.4 in)	30 of 100 (Routine)
Richmond C/K (Tnk)	South Africa	Record daily precipitation	26.0 mm (1.0 in)	30 of 100 (Routine)
Kriel (Pol)	South Africa	Record daily precipitation	29.0 mm (1.1 in)	30 of 100 (Routine)
Usilampatti	India	Record daily precipitation	30.0 mm (1.2 in)	29 of 100 (Routine)
Mena	United States	Record high maximum temperature	22.2 C (72.0 F)	29 of 100 (Routine)
Long Valley	United States	Record daily snowfall	22.9 cm (9.0 in)	29 of 100 (Routine)
Nongoma	South Africa	Record daily precipitation	92.0 mm (3.6 in)	28 of 100 (Routine)
George School	United States	Record daily snowfall	15.2 cm (6.0 in)	28 of 100 (Routine)
Inga	Brazil	Record daily precipitation	25.7 mm (1.0 in)	27 of 100 (Routine)
Harur	India	Record daily precipitation	45.6 mm (1.8 in)	27 of 100 (Routine)
Zajsan	Kazakhstan	Record low maximum temperature	-36.1 C (-33.0 F)	27 of 100 (Routine)
Zajsan	Kazakhstan	Record low minimum temperature	-40.9 C (-41.6 F)	27 of 100 (Routine)
Wolmada	South Africa	Record daily precipitation	34.0 mm (1.3 in)	27 of 100 (Routine)
Tygerfontein	South Africa	Record daily precipitation	56.5 mm (2.2 in)	27 of 100 (Routine)
Springkell	South Africa	Record daily precipitation	37.0 mm (1.5 in)	27 of 100 (Routine)
Newton	United States	Record daily snowfall	14.0 cm (5.5 in)	27 of 100 (Routine)
Grapevine Dam	United States	Record high maximum temperature	23.9 C (75.0 F)	27 of 100 (Routine)
Pau Dos Ferros	Brazil	Record daily precipitation	32.5 mm (1.3 in)	26 of 100 (Routine)
Iluppur	India	Record daily precipitation	35.0 mm (1.4 in)	26 of 100 (Routine)
Grass Range	United States	Record daily snowfall	22.9 cm (9.0 in)	26 of 100 (Routine)
Arlington	United States	Record daily snowfall	10.2 cm (4.0 in)	26 of 100 (Routine)
Cabrobo	Brazil	Record daily precipitation	41.6 mm (1.6 in)	25 of 100 (Routine)
Thief River Falls	United States	Record daily snowfall	5.1 cm (2.0 in)	25 of 100 (Routine)
Scranton	United States	Record daily snowfall	10.2 cm (4.0 in)	25 of 100 (Routine)
Pickens 1	United States	Record daily snowfall	15.2 cm (6.0 in)	25 of 100 (Routine)
Tirukoilur	India	Record daily precipitation	62.8 mm (2.5 in)	24 of 100 (Routine)
Karina	South Africa	Record daily precipitation	46.0 mm (1.8 in)	24 of 100 (Routine)

Counts by Type and Timescale

400 records

Records set or tied on 21 December 1966 by type: Highest daily maximum 69, Lowest daily maximum 25, Highest daily minimum 16, Lowest daily minimum 18, Heaviest daily rainfall 192, Heaviest daily snowfall 71, Deepest snow cover 9.

Records on 21 December 1966 by type
Record type	Records
Highest daily maximum	69
Lowest daily maximum	25
Highest daily minimum	16
Lowest daily minimum	18
Heaviest daily rainfall	192
Heaviest daily snowfall	71
Deepest snow cover	9

Records on 21 December 1966 by timescale: all-time 2, monthly 10, daily 388.

How Much Records Were Beaten By

345 broken records

Margins by which the 345 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 244.0. Ties are not counted.

Top 20 by Significance

21 December 1966

Top 20 records on 21 December 1966 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 December 1966	Eraniel, IN	daily rain	75.7 mm (3.0 in)	63.0 mm (2.5 in)	60 years	58 of 100 (Notable)
21 December 1966	Quakertown, US	daily snowfall	20.8 cm (8.2 in)	19.5 cm (7.7 in)	44 years	54 of 100 (Notable)
21 December 1966	Doylestown, US	daily snowfall	20.3 cm (8.0 in)	20.3 cm (8.0 in)	51 years	52 of 100 (Notable)
21 December 1966	Marayur, IN	daily rain	72.0 mm (2.8 in)	60.1 mm (2.4 in)	21 years	51 of 100 (Notable)
21 December 1966	W Chester 2 NW, US	daily snowfall	25.4 cm (10.0 in)	24.4 cm (9.6 in)	21 years	50 of 100 (Notable)
21 December 1966	Uppiliyapuram, IN	daily rain	85.0 mm (3.3 in)	60.6 mm (2.4 in)	24 years	49 of 100 (Notable)
21 December 1966	Flemington 5 NNW, US	daily snowfall	24.1 cm (9.5 in)	19.0 cm (7.5 in)	49 years	48 of 100 (Notable)
21 December 1966	Cabrobo, BR	daily rain	50.0 mm (2.0 in)	47.8 mm (1.9 in)	17 years	46 of 100 (Notable)
21 December 1966	Jau (Cpef), BR	daily rain	115.0 mm (4.5 in)	83.0 mm (3.3 in)	8 years	44 of 100 (Notable)
21 December 1966	Attur, IN	daily rain	66.4 mm (2.6 in)	56.2 mm (2.2 in)	17 years	44 of 100 (Notable)
21 December 1966	Coatesville 1 SW, US	daily snowfall	22.4 cm (8.8 in)	19.9 cm (7.8 in)	28 years	43 of 100 (Notable)
21 December 1966	Conshohocken, US	daily snowfall	17.8 cm (7.0 in)	17.8 cm (7.0 in)	43 years	43 of 100 (Notable)
21 December 1966	Ariyalur, IN	daily rain	84.8 mm (3.3 in)	77.4 mm (3.0 in)	35 years	39 of 100 (Notable)
21 December 1966	Salto Grande (Cpfl), BR	daily rain	96.2 mm (3.8 in)	54.0 mm (2.1 in)	5 years	38 of 100 (Notable)
21 December 1966	Graterford, US	daily snowfall	20.3 cm (8.0 in)	17.8 cm (7.0 in)	20 years	38 of 100 (Notable)
21 December 1966	Bellrock, ZA	daily rain	43.0 mm (1.7 in)	26.0 mm (1.0 in)	24 years	37 of 100 (Notable)
21 December 1966	Mahlabatini (Mag), ZA	monthly rain	116.2 mm (4.6 in)	20.9 mm (0.8 in)	23 years	37 of 100 (Notable)
21 December 1966	Boonton 1 SE, US	daily snowfall	12.7 cm (5.0 in)	9.4 cm (3.7 in)	49 years	37 of 100 (Notable)
21 December 1966	Kodaikanal, IN	daily rain	54.4 mm (2.1 in)	27.2 mm (1.1 in)	60 years	36 of 100 (Notable)
21 December 1966	US.Macatuba-US.Lencois (Cpfl), BR	daily rain	98.3 mm (3.9 in)	57.1 mm (2.2 in)	8 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 1966

Records set or tied on this calendar date in each year from 1793 to 1966. 1966 had 400 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 1966-12-21: 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 50	312
50 to 100	22
100 to 150	3
150 to 200	6
200 to 250	2