Weather Records on 20 December 1977

484 weather records were set or tied worldwide on 20 December 1977. Highest significance: Taipu, BR.

Key Facts for 20 December 1977

On 20 December 1977, 484 weather records were set or tied at long-record stations worldwide.
107 were record highs and 89 were record lows, counting maximum and minimum temperature.
By timescale, 3 were all-time records, 14 monthly and 467 daily.
Taipu set a monthly record daily precipitation of 74.3 mm (2.9 in) on 20 December 1977.
Across 163 earlier years (1793 to 2025) the same calendar date averaged 467 records.

Record Map

484 stations

484 station records on 20 December 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 December 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Taipu	Brazil	Record daily precipitation	74.3 mm (2.9 in)	63 of 100 (Major)
Bowman	United States	Record snow depth	50.8 cm (20.0 in)	53 of 100 (Notable)
Lewiston	United States	Record snow depth	33.0 cm (13.0 in)	50 of 100 (Notable)
Port Washington	United States	Record daily precipitation	41.9 mm (1.6 in)	49 of 100 (Notable)
Moselle Downs Station	Australia	Record daily precipitation	108.0 mm (4.3 in)	48 of 100 (Notable)
Usina Turvinho	Brazil	Record daily precipitation	83.2 mm (3.3 in)	48 of 100 (Notable)
Mandan Exp STN	United States	Record snow depth	45.7 cm (18.0 in)	48 of 100 (Notable)
Surbiton Station	Australia	Record daily precipitation	81.0 mm (3.2 in)	47 of 100 (Notable)
Usina Batista	Brazil	Record daily precipitation	142.0 mm (5.6 in)	46 of 100 (Notable)
Avare	Brazil	Record daily precipitation	167.2 mm (6.6 in)	45 of 100 (Notable)
Gonvick 2 W	United States	Record daily snowfall	11.4 cm (4.5 in)	45 of 100 (Notable)
Avon Downs	Australia	Record daily precipitation	92.0 mm (3.6 in)	44 of 100 (Notable)
Mapumulo (Tnk)	South Africa	Record daily precipitation	71.5 mm (2.8 in)	43 of 100 (Notable)
Beaver Dam Wwtp	United States	Record daily precipitation	30.5 mm (1.2 in)	43 of 100 (Notable)
Salto de Pirapora	Brazil	Record daily precipitation	77.6 mm (3.1 in)	42 of 100 (Notable)
Columbus Junction	United States	Record daily snowfall	17.8 cm (7.0 in)	42 of 100 (Notable)
Wisconsin Dells Wwtp	United States	Record daily snowfall	15.2 cm (6.0 in)	41 of 100 (Notable)
Manley Hot Springs	United States	Record daily snowfall	40.6 cm (16.0 in)	41 of 100 (Notable)
Double Island Point Lighthouse	Australia	Record daily precipitation	72.2 mm (2.8 in)	40 of 100 (Notable)
Leon Virgen del Camino	Spain	Record daily precipitation	28.7 mm (1.1 in)	40 of 100 (Notable)
Usina Pari	Brazil	Record daily precipitation	81.2 mm (3.2 in)	39 of 100 (Notable)
Milwaukee Mitchell AP	United States	Record daily precipitation	37.6 mm (1.5 in)	39 of 100 (Notable)
Dalton	United States	Record daily snowfall	17.8 cm (7.0 in)	37 of 100 (Notable)
Cacapava	Brazil	Record daily precipitation	69.8 mm (2.7 in)	36 of 100 (Notable)
Stephan 2 NW	United States	Record daily snowfall	7.6 cm (3.0 in)	36 of 100 (Notable)
Wisconsin Rapids	United States	Record daily snowfall	18.3 cm (7.2 in)	36 of 100 (Notable)
Toolebuc	Australia	Record daily precipitation	57.6 mm (2.3 in)	35 of 100 (Notable)
Jataizinho Aneel/Cesp	Brazil	Record daily precipitation	45.6 mm (1.8 in)	35 of 100 (Notable)
Ft Ross	United States	Record high maximum temperature	18.9 C (66.0 F)	35 of 100 (Notable)
Macon	United States	Record daily snowfall	5.1 cm (2.0 in)	35 of 100 (Notable)
Essex Downs Station	Australia	Record daily precipitation	98.0 mm (3.9 in)	34 of 100 (Routine)
Stamford Station	Australia	Record daily precipitation	86.0 mm (3.4 in)	34 of 100 (Routine)
Albion Downs	Australia	Record daily precipitation	59.7 mm (2.4 in)	34 of 100 (Routine)
Bochum	South Africa	Record daily precipitation	52.5 mm (2.1 in)	34 of 100 (Routine)
Williamsburg 1E	United States	Record daily snowfall	7.6 cm (3.0 in)	34 of 100 (Routine)
Biritiba Mirim	Brazil	Record daily precipitation	73.0 mm (2.9 in)	33 of 100 (Routine)
Penedo	Brazil	Record daily precipitation	35.3 mm (1.4 in)	32 of 100 (Routine)
Verhojansk	Russia	Record low maximum temperature	-58.1 C (-72.6 F)	32 of 100 (Routine)
Chariton 1 E	United States	Record daily snowfall	10.2 cm (4.0 in)	32 of 100 (Routine)
Lordsburg 4 SE	United States	Record low minimum temperature	-11.7 C (10.9 F)	32 of 100 (Routine)
Pilgrims Rest (Pol)	South Africa	Record daily precipitation	62.5 mm (2.5 in)	31 of 100 (Routine)
Albia 3 NNE	United States	Record daily snowfall	8.9 cm (3.5 in)	31 of 100 (Routine)
Clinton #1	United States	Record daily snowfall	15.2 cm (6.0 in)	31 of 100 (Routine)
Pella 1S	United States	Record daily snowfall	12.7 cm (5.0 in)	31 of 100 (Routine)
Wrangell AP	United States	Record daily snowfall	24.1 cm (9.5 in)	31 of 100 (Routine)
Monmouth	United States	Record daily snowfall	6.6 cm (2.6 in)	30 of 100 (Routine)
Keosauqua	United States	Record daily snowfall	10.2 cm (4.0 in)	30 of 100 (Routine)
Mosquero 1 NE	United States	Record daily snowfall	7.6 cm (3.0 in)	30 of 100 (Routine)
Janesville	United States	Record daily snowfall	12.7 cm (5.0 in)	30 of 100 (Routine)
Glenview NAS	United States	Record daily snowfall	18.5 cm (7.3 in)	30 of 100 (Routine)
Balfes Creek Post Office	Australia	Record daily precipitation	83.8 mm (3.3 in)	29 of 100 (Routine)
Sarapui	Brazil	Record daily precipitation	76.3 mm (3.0 in)	29 of 100 (Routine)
Verhojansk	Russia	Record low minimum temperature	-59.5 C (-75.1 F)	29 of 100 (Routine)
Podor	Senegal	Record high minimum temperature	24.6 C (76.3 F)	29 of 100 (Routine)
Baraboo Wwtp	United States	Record daily snowfall	15.2 cm (6.0 in)	29 of 100 (Routine)
Barrocada	Brazil	Record daily precipitation	59.7 mm (2.4 in)	28 of 100 (Routine)
Cedarville	United States	Record low maximum temperature	-7.8 C (18.0 F)	28 of 100 (Routine)
Illinois City Dam 16	United States	Record daily snowfall	11.4 cm (4.5 in)	28 of 100 (Routine)
Keithsburg	United States	Record daily snowfall	7.6 cm (3.0 in)	28 of 100 (Routine)
Unionville	United States	Record daily snowfall	7.6 cm (3.0 in)	28 of 100 (Routine)

Counts by Type and Timescale

484 records

Records set or tied on 20 December 1977 by type: Highest daily maximum 64, Lowest daily maximum 47, Highest daily minimum 43, Lowest daily minimum 42, Heaviest daily rainfall 168, Heaviest daily snowfall 105, Deepest snow cover 15.

Records on 20 December 1977 by type
Record type	Records
Highest daily maximum	64
Lowest daily maximum	47
Highest daily minimum	43
Lowest daily minimum	42
Heaviest daily rainfall	168
Heaviest daily snowfall	105
Deepest snow cover	15

Records on 20 December 1977 by timescale: all-time 3, monthly 14, daily 467.

How Much Records Were Beaten By

394 broken records

Margins by which the 394 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 330.0. Ties are not counted.

Top 20 by Significance

20 December 1977

Top 20 records on 20 December 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 December 1977	Taipu, BR	monthly rain	74.3 mm (2.9 in)	31.2 mm (1.2 in)	26 years	63 of 100 (Major)
20 December 1977	Bowman, US	daily snow depth	50.8 cm (20.0 in)	33.0 cm (13.0 in)	26 years	53 of 100 (Notable)
20 December 1977	Lewiston, US	daily snow depth	33.0 cm (13.0 in)	33.0 cm (13.0 in)	43 years	50 of 100 (Notable)
20 December 1977	Port Washington, US	daily rain	41.9 mm (1.6 in)	25.4 mm (1.0 in)	24 years	49 of 100 (Notable)
20 December 1977	Moselle Downs Station, AU	daily rain	108.0 mm (4.3 in)	52.1 mm (2.1 in)	20 years	48 of 100 (Notable)
20 December 1977	Usina Turvinho, BR	daily rain	83.2 mm (3.3 in)	54.7 mm (2.2 in)	19 years	48 of 100 (Notable)
20 December 1977	Mandan Exp STN, US	daily snow depth	45.7 cm (18.0 in)	25.4 cm (10.0 in)	10 years	48 of 100 (Notable)
20 December 1977	Surbiton Station, AU	daily rain	81.0 mm (3.2 in)	45.4 mm (1.8 in)	48 years	47 of 100 (Notable)
20 December 1977	Usina Batista, BR	all-time rain	142.0 mm (5.6 in)	32.0 mm (1.3 in)	9 years	46 of 100 (Notable)
20 December 1977	Avare, BR	all-time rain	167.2 mm (6.6 in)	27.2 mm (1.1 in)	21 years	45 of 100 (Notable)
20 December 1977	Gonvick 2 W, US	daily snowfall	11.4 cm (4.5 in)	8.9 cm (3.5 in)	52 years	45 of 100 (Notable)
20 December 1977	Avon Downs, AU	daily rain	92.0 mm (3.6 in)	53.6 mm (2.1 in)	20 years	44 of 100 (Notable)
20 December 1977	Mapumulo (Tnk), ZA	daily rain	71.5 mm (2.8 in)	35.9 mm (1.4 in)	36 years	43 of 100 (Notable)
20 December 1977	Beaver Dam Wwtp, US	daily rain	30.5 mm (1.2 in)	19.8 mm (0.8 in)	20 years	43 of 100 (Notable)
20 December 1977	Salto de Pirapora, BR	daily rain	77.6 mm (3.1 in)	45.0 mm (1.8 in)	19 years	42 of 100 (Notable)
20 December 1977	Columbus Junction, US	daily snowfall	17.8 cm (7.0 in)	7.6 cm (3.0 in)	63 years	42 of 100 (Notable)
20 December 1977	Wisconsin Dells Wwtp, US	daily snowfall	15.2 cm (6.0 in)	12.7 cm (5.0 in)	26 years	41 of 100 (Notable)
20 December 1977	Manley Hot Springs, US	all-time snowfall	40.6 cm (16.0 in)	1.7 cm (0.7 in)	30 years	41 of 100 (Notable)
20 December 1977	Double Island Point Lighthouse, AU	daily rain	72.2 mm (2.8 in)	17.6 mm (0.7 in)	82 years	40 of 100 (Notable)
20 December 1977	Leon Virgen del Camino, ES	daily rain	28.7 mm (1.1 in)	17.0 mm (0.7 in)	22 years	40 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 484 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 1977-12-20: 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 50	359
50 to 100	25
100 to 150	5
150 to 200	2
200 to 250	0
250 to 300	1
300 to 350	2