Weather Records on 18 December 1977

992 weather records were set or tied worldwide on 18 December 1977. Highest significance: Woodstock, US.

Key Facts for 18 December 1977

On 18 December 1977, 992 weather records were set or tied at long-record stations worldwide.
408 were record highs and 43 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 26 monthly and 965 daily.
Woodstock set a daily record precipitation of 82.8 mm (3.3 in) on 18 December 1977.
Across 156 earlier years (1793 to 2025) the same calendar date averaged 476 records.

Record Map

992 stations

992 station records on 18 December 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 December 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Woodstock	United States	Record daily precipitation	82.8 mm (3.3 in)	66 of 100 (Major)
Towson	United States	Record daily precipitation	106.7 mm (4.2 in)	65 of 100 (Major)
Laurel 3 W	United States	Record daily precipitation	81.5 mm (3.2 in)	63 of 100 (Major)
Bowman	United States	Record snow depth	50.8 cm (20.0 in)	63 of 100 (Major)
Rockville 1 NE	United States	Record daily precipitation	52.1 mm (2.1 in)	56 of 100 (Notable)
Reading Wb City	United States	Record daily precipitation	47.5 mm (1.9 in)	53 of 100 (Notable)
May 2SSE	United States	Record daily snowfall	11.4 cm (4.5 in)	51 of 100 (Notable)
Parkton 2 SW	United States	Record daily precipitation	66.5 mm (2.6 in)	51 of 100 (Notable)
Ashland	United States	Record daily precipitation	47.0 mm (1.9 in)	51 of 100 (Notable)
Greenville 2 NNE	United States	Record daily precipitation	35.6 mm (1.4 in)	50 of 100 (Notable)
Ephrata	United States	Record daily precipitation	50.0 mm (2.0 in)	50 of 100 (Notable)
New Park	United States	Record daily precipitation	59.2 mm (2.3 in)	50 of 100 (Notable)
Glenwood Spgs #2	United States	Record daily precipitation	27.9 mm (1.1 in)	49 of 100 (Notable)
Lewes	United States	Record daily precipitation	65.5 mm (2.6 in)	49 of 100 (Notable)
Lake Victoria (Cal-Lal)	Australia	Record daily precipitation	34.0 mm (1.3 in)	48 of 100 (Notable)
Purcellville	United States	Record daily precipitation	50.0 mm (2.0 in)	47 of 100 (Notable)
Mandan Exp STN	United States	Record snow depth	45.7 cm (18.0 in)	46 of 100 (Notable)
Rock Springs	United States	Record daily snowfall	12.7 cm (5.0 in)	46 of 100 (Notable)
Boremba Station	Australia	Record daily precipitation	88.0 mm (3.5 in)	45 of 100 (Notable)
Piranhas (Marechal Floriano)	Brazil	Record daily precipitation	55.0 mm (2.2 in)	45 of 100 (Notable)
Russell	Canada	Record daily snowfall	6.4 cm (2.5 in)	45 of 100 (Notable)
Owings Ferry Landing	United States	Record daily precipitation	58.4 mm (2.3 in)	44 of 100 (Notable)
Elkwood 6 SE	United States	Record daily precipitation	58.7 mm (2.3 in)	44 of 100 (Notable)
Frederick Police Brks	United States	Record daily precipitation	38.1 mm (1.5 in)	43 of 100 (Notable)
Tavira	Portugal	Record daily precipitation	76.2 mm (3.0 in)	42 of 100 (Notable)
Bridgeville 1 NW	United States	Record daily precipitation	53.3 mm (2.1 in)	42 of 100 (Notable)
Boyds 2 NW	United States	Record daily precipitation	50.8 mm (2.0 in)	42 of 100 (Notable)
Montpelier	United States	Record daily precipitation	27.2 mm (1.1 in)	42 of 100 (Notable)
Baltimore-Washington Intl AP	United States	Record daily precipitation	85.3 mm (3.4 in)	42 of 100 (Notable)
Lewiston	United States	Record snow depth	35.6 cm (14.0 in)	41 of 100 (Notable)
Snow Hill 4 N	United States	Record daily precipitation	66.0 mm (2.6 in)	41 of 100 (Notable)
Unionville	United States	Record daily precipitation	53.3 mm (2.1 in)	40 of 100 (Notable)
Fredericksburg Np	United States	Record daily precipitation	51.1 mm (2.0 in)	40 of 100 (Notable)
The Pas A	Canada	Record daily snowfall	11.5 cm (4.5 in)	39 of 100 (Notable)
Grand Lake 1 NW	United States	Record daily snowfall	20.3 cm (8.0 in)	39 of 100 (Notable)
Hagerstown 1E	United States	Record daily precipitation	34.5 mm (1.4 in)	39 of 100 (Notable)
Cape May 2 NW	United States	Record daily precipitation	55.4 mm (2.2 in)	39 of 100 (Notable)
Paulding	United States	Record daily precipitation	30.5 mm (1.2 in)	39 of 100 (Notable)
York 3 SSW Pump STN	United States	Record daily precipitation	39.6 mm (1.6 in)	39 of 100 (Notable)
Aspen	United States	Record daily snowfall	22.9 cm (9.0 in)	38 of 100 (Notable)
Trout Lake	United States	Record daily precipitation	30.5 mm (1.2 in)	38 of 100 (Notable)
Ashland	United States	Record daily snowfall	5.1 cm (2.0 in)	38 of 100 (Notable)
Newark Ag Farm	United States	Record daily precipitation	54.1 mm (2.1 in)	37 of 100 (Notable)
Princess Anne	United States	Record daily precipitation	52.1 mm (2.1 in)	37 of 100 (Notable)
Anadarko 3 E	United States	Record high maximum temperature	23.3 C (73.9 F)	37 of 100 (Notable)
Phoenixville 1 E	United States	Record daily precipitation	56.6 mm (2.2 in)	37 of 100 (Notable)
Philadelphia City	United States	Record daily precipitation	48.3 mm (1.9 in)	37 of 100 (Notable)
Camoola Park	Australia	Record daily precipitation	40.0 mm (1.6 in)	36 of 100 (Notable)
Woodfords	United States	Record daily precipitation	60.2 mm (2.4 in)	36 of 100 (Notable)
Trout Lake	United States	Record daily snowfall	71.1 cm (28.0 in)	36 of 100 (Notable)
Salisbury	United States	Record daily precipitation	52.1 mm (2.1 in)	36 of 100 (Notable)
Hillsdale	United States	Record daily precipitation	36.8 mm (1.4 in)	36 of 100 (Notable)
Rocksprings	United States	Record high maximum temperature	25.0 C (77.0 F)	36 of 100 (Notable)
Venterstad	South Africa	Record daily precipitation	25.5 mm (1.0 in)	35 of 100 (Notable)
Hetch Hetchy	United States	Record daily precipitation	66.8 mm (2.6 in)	35 of 100 (Notable)
Kern River Ph 1	United States	Record daily precipitation	30.5 mm (1.2 in)	35 of 100 (Notable)
Pocomoke City	United States	Record daily precipitation	70.1 mm (2.8 in)	35 of 100 (Notable)
Louisa	United States	Record daily precipitation	50.0 mm (2.0 in)	35 of 100 (Notable)
Washington Reagan Natl AP	United States	Record daily precipitation	71.4 mm (2.8 in)	35 of 100 (Notable)
Yosemite Park HQ	United States	Record daily precipitation	77.0 mm (3.0 in)	34 of 100 (Routine)

Counts by Type and Timescale

992 records

Records set or tied on 18 December 1977 by type: Highest daily maximum 137, Lowest daily maximum 13, Highest daily minimum 271, Lowest daily minimum 30, Heaviest daily rainfall 437, Heaviest daily snowfall 88, Deepest snow cover 16.

Records on 18 December 1977 by type
Record type	Records
Highest daily maximum	137
Lowest daily maximum	13
Highest daily minimum	271
Lowest daily minimum	30
Heaviest daily rainfall	437
Heaviest daily snowfall	88
Deepest snow cover	16

Records on 18 December 1977 by timescale: all-time 1, monthly 26, daily 965.

How Much Records Were Beaten By

825 broken records

Margins by which the 825 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 356.0. Ties are not counted.

Top 20 by Significance

18 December 1977

Top 20 records on 18 December 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 December 1977	Woodstock, US	daily rain	82.8 mm (3.3 in)	60.4 mm (2.4 in)	62 years	66 of 100 (Major)
18 December 1977	Towson, US	daily rain	106.7 mm (4.2 in)	74.7 mm (2.9 in)	62 years	65 of 100 (Major)
18 December 1977	Laurel 3 W, US	daily rain	81.5 mm (3.2 in)	40.6 mm (1.6 in)	62 years	63 of 100 (Major)
18 December 1977	Bowman, US	daily snow depth	50.8 cm (20.0 in)	33.0 cm (13.0 in)	58 years	63 of 100 (Major)
18 December 1977	Rockville 1 NE, US	daily rain	52.1 mm (2.1 in)	31.5 mm (1.2 in)	62 years	56 of 100 (Notable)
18 December 1977	Reading Wb City, US	daily rain	47.5 mm (1.9 in)	14.5 mm (0.6 in)	107 years	53 of 100 (Notable)
18 December 1977	May 2SSE, US	daily snowfall	11.4 cm (4.5 in)	10.1 cm (4.0 in)	40 years	51 of 100 (Notable)
18 December 1977	Parkton 2 SW, US	daily rain	66.5 mm (2.6 in)	47.4 mm (1.9 in)	16 years	51 of 100 (Notable)
18 December 1977	Ashland, US	daily rain	47.0 mm (1.9 in)	28.2 mm (1.1 in)	62 years	51 of 100 (Notable)
18 December 1977	Greenville 2 NNE, US	daily rain	35.6 mm (1.4 in)	19.6 mm (0.8 in)	56 years	50 of 100 (Notable)
18 December 1977	Ephrata, US	daily rain	50.0 mm (2.0 in)	22.6 mm (0.9 in)	71 years	50 of 100 (Notable)
18 December 1977	New Park, US	daily rain	59.2 mm (2.3 in)	42.7 mm (1.7 in)	26 years	50 of 100 (Notable)
18 December 1977	Glenwood Spgs #2, US	daily rain	27.9 mm (1.1 in)	17.7 mm (0.7 in)	4 years	49 of 100 (Notable)
18 December 1977	Lewes, US	daily rain	65.5 mm (2.6 in)	44.4 mm (1.7 in)	23 years	49 of 100 (Notable)
18 December 1977	Lake Victoria (Cal-Lal), AU	daily rain	34.0 mm (1.3 in)	15.7 mm (0.6 in)	72 years	48 of 100 (Notable)
18 December 1977	Purcellville, US	daily rain	50.0 mm (2.0 in)	29.4 mm (1.2 in)	43 years	47 of 100 (Notable)
18 December 1977	Mandan Exp STN, US	daily snow depth	45.7 cm (18.0 in)	25.4 cm (10.0 in)	4 years	46 of 100 (Notable)
18 December 1977	Rock Springs, US	daily snowfall	12.7 cm (5.0 in)	8.9 cm (3.5 in)	40 years	46 of 100 (Notable)
18 December 1977	Boremba Station, AU	daily rain	88.0 mm (3.5 in)	70.2 mm (2.8 in)	8 years	45 of 100 (Notable)
18 December 1977	Piranhas (Marechal Floriano), BR	daily rain	55.0 mm (2.2 in)	41.4 mm (1.6 in)	62 years	45 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 1977

Records set or tied on this calendar date in each year from 1793 to 1977. 1977 had 992 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 1977-12-18: 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 2026-10-18. Last revised 18 October 2026 (2026-10-18).

Margin	Records
0 to 50	793
50 to 100	22
100 to 150	6
150 to 200	1
200 to 250	0
250 to 300	1
300 to 350	1
350 to 400	1