Weather Records on 15 December 1977

963 weather records were set or tied worldwide on 15 December 1977. Highest significance: Porto, BR.

Key Facts for 15 December 1977

On 15 December 1977, 963 weather records were set or tied at long-record stations worldwide.
487 were record highs and 32 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 23 monthly and 938 daily.
Porto set an all-time record daily precipitation of 218.4 mm (8.6 in) on 15 December 1977.
Across 168 earlier years (1793 to 2025) the same calendar date averaged 453 records.

Record Map

963 stations

963 station records on 15 December 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 15 December 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Porto	Brazil	Record daily precipitation	218.4 mm (8.6 in)	69 of 100 (Major)
Cedarville	United States	Record daily precipitation	27.2 mm (1.1 in)	60 of 100 (Major)
McCall	United States	Record daily precipitation	41.1 mm (1.6 in)	60 of 100 (Major)
Sao Jose de Piranhas	Brazil	Record daily precipitation	52.1 mm (2.1 in)	58 of 100 (Notable)
Bend	United States	Record daily precipitation	36.3 mm (1.4 in)	58 of 100 (Notable)
Fazenda Jardim	Brazil	Record daily precipitation	94.2 mm (3.7 in)	57 of 100 (Notable)
Lewiston	United States	Record snow depth	40.6 cm (16.0 in)	56 of 100 (Notable)
Bowman	United States	Record snow depth	43.2 cm (17.0 in)	56 of 100 (Notable)
Acude Bonito	Brazil	Record daily precipitation	95.0 mm (3.7 in)	53 of 100 (Notable)
Ontario Ksrv	United States	Record daily precipitation	27.4 mm (1.1 in)	53 of 100 (Notable)
Effingham	United States	Record daily precipitation	51.8 mm (2.0 in)	53 of 100 (Notable)
Mc Minnville	United States	Record daily precipitation	71.6 mm (2.8 in)	52 of 100 (Notable)
Snake Rvr	United States	Record daily precipitation	29.7 mm (1.2 in)	51 of 100 (Notable)
New Meadows Rs	United States	Record daily precipitation	47.0 mm (1.9 in)	50 of 100 (Notable)
Fayetteville (Pwc)	United States	Record daily precipitation	43.2 mm (1.7 in)	48 of 100 (Notable)
Yellowknife Hydro	Canada	Record daily snowfall	15.7 cm (6.2 in)	47 of 100 (Notable)
Grouse	United States	Record daily precipitation	30.5 mm (1.2 in)	47 of 100 (Notable)
Wickiup Dam	United States	Record daily precipitation	45.7 mm (1.8 in)	46 of 100 (Notable)
Lencois	Brazil	Record daily precipitation	171.5 mm (6.8 in)	45 of 100 (Notable)
Port Aux Basques	Canada	Record daily precipitation	47.2 mm (1.9 in)	45 of 100 (Notable)
Austin 3 S	United States	Record daily precipitation	36.8 mm (1.4 in)	45 of 100 (Notable)
Ochoco Rs	United States	Record daily precipitation	35.8 mm (1.4 in)	45 of 100 (Notable)
Redmond 2 W	United States	Record daily precipitation	30.7 mm (1.2 in)	45 of 100 (Notable)
Glen Alphen	South Africa	Record daily precipitation	60.0 mm (2.4 in)	44 of 100 (Notable)
Malta	Brazil	Record daily precipitation	83.0 mm (3.3 in)	43 of 100 (Notable)
Sierraville Rs	United States	Record daily precipitation	64.8 mm (2.6 in)	43 of 100 (Notable)
Corvallis State UNIV	United States	Record daily precipitation	44.7 mm (1.8 in)	43 of 100 (Notable)
Dillon	United States	Record daily precipitation	59.9 mm (2.4 in)	42 of 100 (Notable)
Canton 4 SE	United States	Record snow depth	38.1 cm (15.0 in)	42 of 100 (Notable)
Porto	Brazil	Record daily precipitation	131.3 mm (5.2 in)	41 of 100 (Notable)
Juremal (Jurema)	Brazil	Record daily precipitation	80.0 mm (3.1 in)	41 of 100 (Notable)
Grindstone Island	Canada	Record daily precipitation	32.6 mm (1.3 in)	41 of 100 (Notable)
Charlottetown A	Canada	Record daily precipitation	43.4 mm (1.7 in)	41 of 100 (Notable)
Port Aux Basques	Canada	Record daily snowfall	24.2 cm (9.5 in)	41 of 100 (Notable)
Georgetown Rs	United States	Record daily precipitation	106.2 mm (4.2 in)	41 of 100 (Notable)
Tahoe City	United States	Record daily precipitation	54.1 mm (2.1 in)	41 of 100 (Notable)
Hailey 3 NNW	United States	Record daily precipitation	35.8 mm (1.4 in)	41 of 100 (Notable)
Red Springs 1 SE	United States	Record daily precipitation	47.8 mm (1.9 in)	41 of 100 (Notable)
Williams 1 NW	United States	Record daily precipitation	44.7 mm (1.8 in)	41 of 100 (Notable)
Cascade 1 NW	United States	Record daily precipitation	31.8 mm (1.3 in)	40 of 100 (Notable)
Lumberton	United States	Record daily precipitation	48.3 mm (1.9 in)	40 of 100 (Notable)
Condado	Brazil	Record daily precipitation	95.2 mm (3.7 in)	39 of 100 (Notable)
Macaubas	Brazil	Record daily precipitation	69.0 mm (2.7 in)	39 of 100 (Notable)
Mocambo	Brazil	Record daily precipitation	45.6 mm (1.8 in)	38 of 100 (Notable)
Hostotipaquillo	Mexico	Record high minimum temperature	18.9 C (66.0 F)	38 of 100 (Notable)
Bowman Dam	United States	Record daily precipitation	94.0 mm (3.7 in)	38 of 100 (Notable)
Arrowrock Dam	United States	Record daily precipitation	31.8 mm (1.3 in)	38 of 100 (Notable)
Plainfield	United States	Record high minimum temperature	8.3 C (46.9 F)	38 of 100 (Notable)
Elizabethtown	United States	Record daily precipitation	48.3 mm (1.9 in)	38 of 100 (Notable)
Mandan Exp STN	United States	Record snow depth	38.1 cm (15.0 in)	38 of 100 (Notable)
South Pass City	United States	Record daily snowfall	12.7 cm (5.0 in)	38 of 100 (Notable)
Boqueirao Pedras Brancas	Brazil	Record daily precipitation	119.2 mm (4.7 in)	37 of 100 (Notable)
Auburn	United States	Record daily precipitation	67.3 mm (2.6 in)	37 of 100 (Notable)
Iowa Hill	United States	Record daily precipitation	79.2 mm (3.1 in)	37 of 100 (Notable)
Ft Fairfield 5 NE	United States	Record daily snowfall	30.5 cm (12.0 in)	37 of 100 (Notable)
West Burke	United States	Record daily precipitation	35.1 mm (1.4 in)	37 of 100 (Notable)
Goldsboro 4 SE	United States	Record daily precipitation	37.1 mm (1.5 in)	37 of 100 (Notable)
Placerville	United States	Record daily precipitation	60.5 mm (2.4 in)	36 of 100 (Notable)
Tiger Creek Ph	United States	Record daily precipitation	83.1 mm (3.3 in)	36 of 100 (Notable)
Squa Pan Dam	United States	Record daily snowfall	27.9 cm (11.0 in)	36 of 100 (Notable)

Counts by Type and Timescale

963 records

Records set or tied on 15 December 1977 by type: Highest daily maximum 201, Lowest daily maximum 19, Highest daily minimum 286, Lowest daily minimum 13, Heaviest daily rainfall 393, Heaviest daily snowfall 30, Deepest snow cover 21.

Records on 15 December 1977 by type
Record type	Records
Highest daily maximum	201
Lowest daily maximum	19
Highest daily minimum	286
Lowest daily minimum	13
Heaviest daily rainfall	393
Heaviest daily snowfall	30
Deepest snow cover	21

Records on 15 December 1977 by timescale: all-time 2, monthly 23, daily 938.

How Much Records Were Beaten By

765 broken records

Margins by which the 765 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 406.0. Ties are not counted.

Top 20 by Significance

15 December 1977

Top 20 records on 15 December 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
15 December 1977	Porto, BR	all-time rain	218.4 mm (8.6 in)	68.4 mm (2.7 in)	17 years	69 of 100 (Major)
15 December 1977	Cedarville, US	daily rain	27.2 mm (1.1 in)	18.1 mm (0.7 in)	71 years	60 of 100 (Major)
15 December 1977	McCall, US	daily rain	41.1 mm (1.6 in)	28.1 mm (1.1 in)	44 years	60 of 100 (Major)
15 December 1977	Sao Jose de Piranhas, BR	daily rain	52.1 mm (2.1 in)	48.6 mm (1.9 in)	62 years	58 of 100 (Notable)
15 December 1977	Bend, US	daily rain	36.3 mm (1.4 in)	26.9 mm (1.1 in)	48 years	58 of 100 (Notable)
15 December 1977	Fazenda Jardim, BR	daily rain	94.2 mm (3.7 in)	84.4 mm (3.3 in)	43 years	57 of 100 (Notable)
15 December 1977	Lewiston, US	daily snow depth	40.6 cm (16.0 in)	40.6 cm (16.0 in)	39 years	56 of 100 (Notable)
15 December 1977	Bowman, US	daily snow depth	43.2 cm (17.0 in)	22.9 cm (9.0 in)	58 years	56 of 100 (Notable)
15 December 1977	Acude Bonito, BR	monthly rain	95.0 mm (3.7 in)	29.5 mm (1.2 in)	60 years	53 of 100 (Notable)
15 December 1977	Ontario Ksrv, US	daily rain	27.4 mm (1.1 in)	23.3 mm (0.9 in)	20 years	53 of 100 (Notable)
15 December 1977	Effingham, US	daily rain	51.8 mm (2.0 in)	27.2 mm (1.1 in)	76 years	53 of 100 (Notable)
15 December 1977	Mc Minnville, US	daily rain	71.6 mm (2.8 in)	36.8 mm (1.4 in)	38 years	52 of 100 (Notable)
15 December 1977	Snake Rvr, US	daily rain	29.7 mm (1.2 in)	23.3 mm (0.9 in)	36 years	51 of 100 (Notable)
15 December 1977	New Meadows Rs, US	daily rain	47.0 mm (1.9 in)	31.8 mm (1.3 in)	12 years	50 of 100 (Notable)
15 December 1977	Fayetteville (Pwc), US	daily rain	43.2 mm (1.7 in)	11.4 mm (0.4 in)	97 years	48 of 100 (Notable)
15 December 1977	Yellowknife Hydro, CA	daily snowfall	15.7 cm (6.2 in)	9.9 cm (3.9 in)	15 years	47 of 100 (Notable)
15 December 1977	Grouse, US	daily rain	30.5 mm (1.2 in)	23.9 mm (0.9 in)	20 years	47 of 100 (Notable)
15 December 1977	Wickiup Dam, US	daily rain	45.7 mm (1.8 in)	36.6 mm (1.4 in)	12 years	46 of 100 (Notable)
15 December 1977	Lencois, BR	monthly rain	171.5 mm (6.8 in)	39.7 mm (1.6 in)	28 years	45 of 100 (Notable)
15 December 1977	Port Aux Basques, CA	daily rain	47.2 mm (1.9 in)	20.8 mm (0.8 in)	59 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 963 records.

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

Records on 12-15 in each year
Year	Records
1793	1
1796	1
1798	1
1800	1
1808	3
1810	1
1814	3
1815	1
1825	1
1831	1
1840	2
1844	2
1846	3
1847	1
1854	3
1859	2
1863	1
1864	1
1866	1
1867	2
1868	1
1869	1
1870	1
1873	1
1874	1
1878	4
1879	2
1880	2
1881	3
1882	2
1883	1
1885	1
1886	1
1889	3
1890	1
1891	2
1892	4
1893	1
1894	4
1895	1
1896	5
1897	2
1899	12
1900	5
1901	21
1902	3
1903	7
1904	9
1905	6
1906	9
1907	10
1908	5
1909	5
1910	4
1911	23
1912	42
1913	13
1914	239
1915	180
1916	40
1917	40
1918	54
1919	28
1920	35
1921	26
1922	65
1923	132
1924	358
1925	187
1926	226
1927	235
1928	388
1929	500
1930	160
1931	284
1932	385
1933	796
1934	199
1935	140
1936	286
1937	310
1938	100
1939	637
1940	464
1941	373
1942	385
1943	486
1944	281
1945	420
1946	521
1947	634
1948	1,239
1949	135
1950	292
1951	962
1952	367
1953	270
1954	413
1955	371
1956	531
1957	304
1958	531
1959	560
1960	313
1961	883
1962	979
1963	670
1964	371
1965	759
1966	275
1967	948
1968	510
1969	352
1970	215
1971	1,739
1972	1,159
1973	615
1974	511
1975	1,230
1976	349
1977	963
1978	499
1979	560
1980	1,085
1981	1,243
1982	831
1983	1,229
1984	1,397
1985	1,077
1986	502
1987	1,740
1988	519
1989	2,753
1990	846
1991	636
1992	1,263
1993	734
1994	676
1995	848
1996	727
1997	1,521
1998	1,216
1999	621
2000	1,154
2001	1,026
2002	831
2003	846
2004	795
2005	953
2006	1,491
2007	973
2008	1,789
2009	930
2010	1,705
2011	780
2012	1,058
2013	701
2014	1,045
2015	1,398
2016	1,024
2017	332
2018	539
2019	547
2020	400
2021	1,182
2022	1,057
2023	794
2024	369
2025	2,115

Download the Data

Data for records on 1977-12-15: 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 100	752
100 to 200	8
200 to 300	3
300 to 400	1
400 to 500	1