Weather Records on 18 December 1963

571 weather records were set or tied worldwide on 18 December 1963. Highest significance: Pacatuba (Pacatiba), BR.

Key Facts for 18 December 1963

On 18 December 1963, 571 weather records were set or tied at long-record stations worldwide.
45 were record highs and 298 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 18 monthly and 551 daily.
Pacatuba (Pacatiba) set a monthly record daily precipitation of 108.0 mm (4.3 in) on 18 December 1963.
Across 156 earlier years (1793 to 2025) the same calendar date averaged 479 records.

Record Map

571 stations

571 station records on 18 December 1963 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 December 1963: highest significance records shown on the map
Station	Country	Type	Value	Significance
Pacatuba (Pacatiba)	Brazil	Record daily precipitation	108.0 mm (4.3 in)	64 of 100 (Major)
Sao Jose de Mipibu	Brazil	Record daily precipitation	125.4 mm (4.9 in)	63 of 100 (Major)
Natal	Brazil	Record daily precipitation	85.7 mm (3.4 in)	62 of 100 (Major)
Hart 3 WSW	United States	Record daily snowfall	47.0 cm (18.5 in)	58 of 100 (Notable)
Santa Cruz	Brazil	Record daily precipitation	72.0 mm (2.8 in)	57 of 100 (Notable)
Inga	Brazil	Record daily precipitation	33.8 mm (1.3 in)	54 of 100 (Notable)
Cicero Dantas	Brazil	Record daily precipitation	70.0 mm (2.8 in)	54 of 100 (Notable)
Bologna	Italy	Record low minimum temperature	-13.2 C (8.2 F)	52 of 100 (Notable)
Amarante	Brazil	Record daily precipitation	158.0 mm (6.2 in)	50 of 100 (Notable)
Sao Rafael	Brazil	Record daily precipitation	56.5 mm (2.2 in)	49 of 100 (Notable)
Muskegon Co AP	United States	Record daily snowfall	19.1 cm (7.5 in)	49 of 100 (Notable)
Mulungu (Camarazal)	Brazil	Record daily precipitation	29.8 mm (1.2 in)	48 of 100 (Notable)
Araruna	Brazil	Record daily precipitation	48.0 mm (1.9 in)	48 of 100 (Notable)
Ludington 4 SE	United States	Record daily snowfall	40.9 cm (16.1 in)	48 of 100 (Notable)
Cabrobo	Brazil	Record daily precipitation	110.4 mm (4.3 in)	44 of 100 (Notable)
Doolgunna	Australia	Record daily precipitation	54.1 mm (2.1 in)	43 of 100 (Notable)
Hannam Vale (Hannam Vale Road)	Australia	Record daily precipitation	101.6 mm (4.0 in)	42 of 100 (Notable)
Toronto	Canada	Record daily snowfall	16.5 cm (6.5 in)	42 of 100 (Notable)
Farmland 5 NNW	United States	Record snow depth	15.2 cm (6.0 in)	40 of 100 (Notable)
Allegan 5NE	United States	Record daily snowfall	34.3 cm (13.5 in)	39 of 100 (Notable)
Campina Grande	Brazil	Record daily precipitation	39.2 mm (1.5 in)	37 of 100 (Notable)
Kendall Post Office	Australia	Record daily precipitation	60.2 mm (2.4 in)	36 of 100 (Notable)
Junqueiro	Brazil	Record daily precipitation	71.8 mm (2.8 in)	36 of 100 (Notable)
Gospic	Croatia	Record low maximum temperature	-14.6 C (5.7 F)	35 of 100 (Notable)
Vacaville	United States	Record low maximum temperature	2.2 C (36.0 F)	35 of 100 (Notable)
Kirchdorf/Poel	Germany	Record snow depth	10.0 cm (3.9 in)	34 of 100 (Routine)
Catarina	Brazil	Record daily precipitation	30.0 mm (1.2 in)	33 of 100 (Routine)
Saboeiro	Brazil	Record daily precipitation	62.1 mm (2.4 in)	33 of 100 (Routine)
Scottville 1 NE	United States	Record daily snowfall	20.3 cm (8.0 in)	33 of 100 (Routine)
Sheridan Fld STN	United States	Record daily snowfall	9.1 cm (3.6 in)	33 of 100 (Routine)
Emerald Post Office	Australia	Record daily precipitation	46.0 mm (1.8 in)	32 of 100 (Routine)
Bloomingdale	United States	Record daily snowfall	29.2 cm (11.5 in)	32 of 100 (Routine)
La Estanzuela (Eele)	Uruguay	Record daily precipitation	38.0 mm (1.5 in)	32 of 100 (Routine)
Campos Sales	Brazil	Record daily precipitation	51.0 mm (2.0 in)	31 of 100 (Routine)
Detour Village	United States	Record daily snowfall	15.2 cm (6.0 in)	31 of 100 (Routine)
Lichtentanne	Germany	Record snow depth	18.0 cm (7.1 in)	30 of 100 (Routine)
Saint Helena	United States	Record low maximum temperature	5.0 C (41.0 F)	30 of 100 (Routine)
Walnut	United States	Record snow depth	20.3 cm (8.0 in)	30 of 100 (Routine)
Sedalia Wtp	United States	Record low minimum temperature	-20.0 C (-4.0 F)	30 of 100 (Routine)
Ness City	United States	Record low minimum temperature	-18.3 C (-0.9 F)	29 of 100 (Routine)
Yates Ctr	United States	Record low maximum temperature	-7.2 C (19.0 F)	29 of 100 (Routine)
Frankfort Downtown	United States	Record daily snowfall	5.1 cm (2.0 in)	29 of 100 (Routine)
Ravenna	United States	Record low minimum temperature	-27.2 C (-17.0 F)	29 of 100 (Routine)
Ogdensburg 4 NE	United States	Record snow depth	15.2 cm (6.0 in)	29 of 100 (Routine)
Home Hill Fifteen A St	Australia	Record daily precipitation	69.9 mm (2.8 in)	28 of 100 (Routine)
Osijek	Croatia	Record low minimum temperature	-23.2 C (-9.8 F)	28 of 100 (Routine)
Washington 2 ESE	United States	Record low minimum temperature	-11.1 C (12.0 F)	28 of 100 (Routine)
Onawa 3NW	United States	Record low minimum temperature	-26.1 C (-15.0 F)	28 of 100 (Routine)
Lawrence	United States	Record low minimum temperature	-18.9 C (-2.0 F)	28 of 100 (Routine)
Hannibal 1 N	United States	Record daily snowfall	10.9 cm (4.3 in)	28 of 100 (Routine)
Genoa 2 W	United States	Record low minimum temperature	-27.8 C (-18.0 F)	28 of 100 (Routine)
Muskegon Co AP	United States	Record snow depth	76.2 cm (30.0 in)	28 of 100 (Routine)
Rochester Intl AP	United States	Record low maximum temperature	-20.0 C (-4.0 F)	28 of 100 (Routine)
Brumado	Brazil	Record daily precipitation	48.1 mm (1.9 in)	27 of 100 (Routine)
Gospic	Croatia	Record low minimum temperature	-26.6 C (-15.9 F)	27 of 100 (Routine)
Mason City	United States	Record low maximum temperature	-17.8 C (0.0 F)	27 of 100 (Routine)
Horton	United States	Record low minimum temperature	-21.7 C (-7.1 F)	27 of 100 (Routine)
Manistee 3SE	United States	Record daily snowfall	45.7 cm (18.0 in)	27 of 100 (Routine)
Lockwood	United States	Record low minimum temperature	-16.7 C (1.9 F)	27 of 100 (Routine)
Broken Bow 2 W	United States	Record low minimum temperature	-30.0 C (-22.0 F)	27 of 100 (Routine)

Counts by Type and Timescale

571 records

Records set or tied on 18 December 1963 by type: Highest daily maximum 23, Lowest daily maximum 126, Highest daily minimum 22, Lowest daily minimum 172, Heaviest daily rainfall 137, Heaviest daily snowfall 61, Deepest snow cover 30.

Records on 18 December 1963 by type
Record type	Records
Highest daily maximum	23
Lowest daily maximum	126
Highest daily minimum	22
Lowest daily minimum	172
Heaviest daily rainfall	137
Heaviest daily snowfall	61
Deepest snow cover	30

Records on 18 December 1963 by timescale: all-time 2, monthly 18, daily 551.

How Much Records Were Beaten By

464 broken records

Margins by which the 464 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 320.0. Ties are not counted.

Top 20 by Significance

18 December 1963

Top 20 records on 18 December 1963 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 December 1963	Pacatuba (Pacatiba), BR	monthly rain	108.0 mm (4.3 in)	74.2 mm (2.9 in)	34 years	64 of 100 (Major)
18 December 1963	Sao Jose de Mipibu, BR	monthly rain	125.4 mm (4.9 in)	60.3 mm (2.4 in)	28 years	63 of 100 (Major)
18 December 1963	Natal, BR	monthly rain	85.7 mm (3.4 in)	52.6 mm (2.1 in)	32 years	62 of 100 (Major)
18 December 1963	Hart 3 WSW, US	all-time snowfall	47.0 cm (18.5 in)	6.4 cm (2.5 in)	53 years	58 of 100 (Notable)
18 December 1963	Santa Cruz, BR	monthly rain	72.0 mm (2.8 in)	39.0 mm (1.5 in)	12 years	57 of 100 (Notable)
18 December 1963	Inga, BR	daily rain	33.8 mm (1.3 in)	25.3 mm (1.0 in)	52 years	54 of 100 (Notable)
18 December 1963	Cicero Dantas, BR	daily rain	70.0 mm (2.8 in)	57.8 mm (2.3 in)	32 years	54 of 100 (Notable)
18 December 1963	Bologna, IT	monthly low min	-13.2 C (8.2 F)	0.9 C (1.6 F)	109 years	52 of 100 (Notable)
18 December 1963	Amarante, BR	monthly rain	158.0 mm (6.2 in)	62.8 mm (2.5 in)	19 years	50 of 100 (Notable)
18 December 1963	Sao Rafael, BR	monthly rain	56.5 mm (2.2 in)	35.5 mm (1.4 in)	1 year	49 of 100 (Notable)
18 December 1963	Muskegon Co AP, US	daily snowfall	19.1 cm (7.5 in)	14.0 cm (5.5 in)	36 years	49 of 100 (Notable)
18 December 1963	Mulungu (Camarazal), BR	daily rain	29.8 mm (1.2 in)	25.1 mm (1.0 in)	16 years	48 of 100 (Notable)
18 December 1963	Araruna, BR	daily rain	48.0 mm (1.9 in)	30.8 mm (1.2 in)	16 years	48 of 100 (Notable)
18 December 1963	Ludington 4 SE, US	daily snowfall	40.9 cm (16.1 in)	32.0 cm (12.6 in)	8 years	48 of 100 (Notable)
18 December 1963	Cabrobo, BR	daily rain	110.4 mm (4.3 in)	44.7 mm (1.8 in)	48 years	44 of 100 (Notable)
18 December 1963	Doolgunna, AU	monthly rain	54.1 mm (2.1 in)	16.8 mm (0.7 in)	32 years	43 of 100 (Notable)
18 December 1963	Hannam Vale (Hannam Vale Road), AU	daily rain	101.6 mm (4.0 in)	66.5 mm (2.6 in)	2 years	42 of 100 (Notable)
18 December 1963	Toronto, CA	daily snowfall	16.5 cm (6.5 in)	1.3 cm (0.5 in)	103 years	42 of 100 (Notable)
18 December 1963	Farmland 5 NNW, US	daily snow depth	15.2 cm (6.0 in)	15.2 cm (6.0 in)	61 years	40 of 100 (Notable)
18 December 1963	Allegan 5NE, US	all-time snowfall	34.3 cm (13.5 in)	2.5 cm (1.0 in)	31 years	39 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 571 records.

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

Records on 12-18 in each year
Year	Records
1793	1
1796	1
1805	1
1814	1
1825	1
1846	1
1849	1
1852	2
1858	1
1859	4
1862	2
1864	1
1868	1
1873	1
1875	1
1876	2
1878	1
1881	2
1882	1
1884	2
1886	1
1887	1
1888	1
1889	4
1890	5
1892	4
1894	8
1895	1
1897	4
1898	9
1899	3
1900	2
1901	6
1902	33
1903	11
1904	25
1905	3
1906	21
1907	15
1908	16
1909	18
1910	19
1911	9
1912	33
1913	38
1914	20
1915	28
1916	57
1917	62
1918	21
1919	117
1920	77
1921	123
1922	108
1923	378
1924	480
1925	74
1926	173
1927	151
1928	165
1929	366
1930	230
1931	360
1932	353
1933	506
1934	209
1935	138
1936	466
1937	459
1938	185
1939	900
1940	242
1941	213
1942	281
1943	419
1944	191
1945	598
1946	199
1947	266
1948	354
1949	561
1950	289
1951	867
1952	450
1953	373
1954	507
1955	611
1956	333
1957	901
1958	524
1959	477
1960	477
1961	885
1962	759
1963	571
1964	840
1965	402
1966	644
1967	1,105
1968	488
1969	376
1970	502
1971	387
1972	375
1973	1,008
1974	229
1975	625
1976	459
1977	992
1978	946
1979	1,087
1980	772
1981	1,362
1982	537
1983	2,014
1984	1,439
1985	1,384
1986	875
1987	1,505
1988	1,061
1989	1,818
1990	1,367
1991	756
1992	1,045
1993	697
1994	643
1995	1,065
1996	1,833
1997	1,195
1998	863
1999	923
2000	1,572
2001	906
2002	1,437
2003	987
2004	506
2005	987
2006	1,167
2007	746
2008	1,014
2009	1,253
2010	1,322
2011	697
2012	729
2013	513
2014	556
2015	1,254
2016	1,821
2017	516
2018	464
2019	679
2020	326
2021	762
2022	536
2023	1,293
2024	780
2025	994

Download the Data

Data for records on 1963-12-18: 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 50	436
50 to 100	18
100 to 150	7
150 to 200	2
200 to 250	0
250 to 300	0
300 to 350	1