Weather Records on 20 December 1986

321 weather records were set or tied worldwide on 20 December 1986. Highest significance: Valentine 10 WSW, US.

Key Facts for 20 December 1986

On 20 December 1986, 321 weather records were set or tied at long-record stations worldwide.
93 were record highs and 70 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 11 monthly and 310 daily.
Valentine 10 WSW set a monthly record daily precipitation of 38.6 mm (1.5 in) on 20 December 1986.
Across 163 earlier years (1793 to 2025) the same calendar date averaged 468 records.

Record Map

321 stations

321 station records on 20 December 1986 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 December 1986: highest significance records shown on the map
Station	Country	Type	Value	Significance
Valentine 10 WSW	United States	Record daily precipitation	38.6 mm (1.5 in)	54 of 100 (Notable)
Fresno Yosemite Intl	United States	Record daily precipitation	38.1 mm (1.5 in)	53 of 100 (Notable)
Musgrave	Australia	Record daily precipitation	70.0 mm (2.8 in)	46 of 100 (Notable)
Volta Redonda	Brazil	Record daily precipitation	90.6 mm (3.6 in)	40 of 100 (Notable)
Hatch	United States	Record daily precipitation	27.9 mm (1.1 in)	40 of 100 (Notable)
Matua	Russia	Record daily precipitation	32.3 mm (1.3 in)	39 of 100 (Notable)
Bulverde	United States	Record daily precipitation	47.0 mm (1.9 in)	38 of 100 (Notable)
Vytegra	Russia	Record low minimum temperature	-33.2 C (-27.8 F)	37 of 100 (Notable)
Ai-Petri	Ukraine	Record daily precipitation	46.2 mm (1.8 in)	37 of 100 (Notable)
Barra Mansa	Brazil	Record daily precipitation	77.5 mm (3.1 in)	34 of 100 (Routine)
Altamirano (Smn)	Mexico	Record daily precipitation	28.7 mm (1.1 in)	32 of 100 (Routine)
Delta	United States	Record high maximum temperature	15.6 C (60.1 F)	30 of 100 (Routine)
Pereque	Brazil	Record daily precipitation	79.3 mm (3.1 in)	28 of 100 (Routine)
Oravska Lesna	Slovakia	Record daily precipitation	31.8 mm (1.3 in)	27 of 100 (Routine)
Rodovia Anchieta-Cota 400	Brazil	Record daily precipitation	115.2 mm (4.5 in)	26 of 100 (Routine)
Kvikkjokk-Arrenjarka	Sweden	Record low maximum temperature	-30.4 C (-22.7 F)	26 of 100 (Routine)
Ana Dias	Brazil	Record daily precipitation	64.6 mm (2.5 in)	25 of 100 (Routine)
Cedral	Mexico	Record high minimum temperature	8.9 C (48.0 F)	25 of 100 (Routine)
Malmberget	Sweden	Record low maximum temperature	-27.0 C (-16.6 F)	25 of 100 (Routine)
Ubatuba	Brazil	Record daily precipitation	104.8 mm (4.1 in)	24 of 100 (Routine)
Conklingville Dam	United States	Record snow depth	45.7 cm (18.0 in)	24 of 100 (Routine)
Larimore 4SW	United States	Record snow depth	27.9 cm (11.0 in)	24 of 100 (Routine)
Kanab	United States	Record high minimum temperature	2.8 C (37.0 F)	24 of 100 (Routine)
Escalante	United States	Record high minimum temperature	-0.6 C (30.9 F)	23 of 100 (Routine)
Haleakala Rs 338	United States	Record high minimum temperature	11.7 C (53.1 F)	23 of 100 (Routine)
Picinguaba	Brazil	Record daily precipitation	96.6 mm (3.8 in)	22 of 100 (Routine)
Lulea Flygplats	Sweden	Record low maximum temperature	-27.3 C (-17.1 F)	22 of 100 (Routine)
Same	Tanzania	Record daily precipitation	27.0 mm (1.1 in)	22 of 100 (Routine)
Valdez WSO	United States	Record high minimum temperature	0.6 C (33.1 F)	22 of 100 (Routine)
Tepatitlan	Mexico	Record high minimum temperature	15.0 C (59.0 F)	21 of 100 (Routine)
Tecamachalco	Mexico	Record high maximum temperature	31.7 C (89.1 F)	21 of 100 (Routine)
Ukhta Kalevala	Russia	Record low maximum temperature	-29.7 C (-21.5 F)	21 of 100 (Routine)
Jokkmokk	Sweden	Record low minimum temperature	-40.3 C (-40.5 F)	21 of 100 (Routine)
Rinconada	Mexico	Record daily precipitation	24.9 mm (1.0 in)	20 of 100 (Routine)
Oktjabrskaja	Russia	Record daily precipitation	15.0 mm (0.6 in)	20 of 100 (Routine)
Laren	Netherlands	Record daily precipitation	16.5 mm (0.6 in)	20 of 100 (Routine)
Kiev	Ukraine	Record daily precipitation	23.0 mm (0.9 in)	20 of 100 (Routine)
Allende (Smn)	Mexico	Record daily precipitation	8.9 mm (0.35 in)	20 of 100 (Routine)
Kystovka	Russia	Record daily precipitation	9.9 mm (0.39 in)	20 of 100 (Routine)
Kustanai	Kazakhstan	Record daily precipitation	9.5 mm (0.37 in)	20 of 100 (Routine)
Myronivka	Ukraine	Record daily precipitation	19.6 mm (0.8 in)	20 of 100 (Routine)
Cernigov	Ukraine	Record daily precipitation	24.6 mm (1.0 in)	20 of 100 (Routine)
Tomsk	Russia	Record daily precipitation	9.9 mm (0.39 in)	20 of 100 (Routine)
Cingirlau	Kazakhstan	Record daily precipitation	10.1 mm (0.4 in)	20 of 100 (Routine)
Chapaevo	Kazakhstan	Record daily precipitation	16.9 mm (0.7 in)	20 of 100 (Routine)
Sierra City	United States	Record daily snowfall	3.8 cm (1.5 in)	20 of 100 (Routine)
Herford	Germany	Record daily precipitation	20.4 mm (0.8 in)	20 of 100 (Routine)
Nordhorn	Germany	Record daily precipitation	19.3 mm (0.8 in)	20 of 100 (Routine)
Rottweil	Germany	Record daily precipitation	14.5 mm (0.6 in)	20 of 100 (Routine)
Gendringen	Netherlands	Record daily precipitation	15.8 mm (0.6 in)	20 of 100 (Routine)
Sumiha	Russia	Record daily precipitation	8.3 mm (0.33 in)	20 of 100 (Routine)
Kunda	Estonia	Record daily precipitation	13.0 mm (0.5 in)	20 of 100 (Routine)
Altastenberg	Germany	Record daily precipitation	24.3 mm (1.0 in)	20 of 100 (Routine)
Scotia	United States	Record snow depth	2.5 cm (1.0 in)	20 of 100 (Routine)
Wupatki Nm	United States	Record daily precipitation	11.2 mm (0.4 in)	20 of 100 (Routine)
Zolotonosha	Ukraine	Record daily precipitation	16.0 mm (0.6 in)	20 of 100 (Routine)
Zoutkamp	Netherlands	Record daily precipitation	21.9 mm (0.9 in)	20 of 100 (Routine)
Weesp	Netherlands	Record daily precipitation	19.1 mm (0.8 in)	20 of 100 (Routine)
Wahlsburg-Lippoldsberg	Germany	Record daily precipitation	18.8 mm (0.7 in)	20 of 100 (Routine)
Bocholt	Germany	Record daily precipitation	14.0 mm (0.6 in)	20 of 100 (Routine)

Counts by Type and Timescale

321 records

Records set or tied on 20 December 1986 by type: Highest daily maximum 45, Lowest daily maximum 41, Highest daily minimum 48, Lowest daily minimum 29, Heaviest daily rainfall 143, Heaviest daily snowfall 8, Deepest snow cover 7.

Records on 20 December 1986 by type
Record type	Records
Highest daily maximum	45
Lowest daily maximum	41
Highest daily minimum	48
Lowest daily minimum	29
Heaviest daily rainfall	143
Heaviest daily snowfall	8
Deepest snow cover	7

Records on 20 December 1986 by timescale: all-time 0, monthly 11, daily 310.

How Much Records Were Beaten By

244 broken records

Margins by which the 244 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 127.0. Ties are not counted.

Top 20 by Significance

20 December 1986

Top 20 records on 20 December 1986 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 December 1986	Valentine 10 WSW, US	monthly rain	38.6 mm (1.5 in)	12.2 mm (0.5 in)	43 years	54 of 100 (Notable)
20 December 1986	Fresno Yosemite Intl, US	daily rain	38.1 mm (1.5 in)	31.2 mm (1.2 in)	33 years	53 of 100 (Notable)
20 December 1986	Musgrave, AU	daily rain	70.0 mm (2.8 in)	15.4 mm (0.6 in)	97 years	46 of 100 (Notable)
20 December 1986	Volta Redonda, BR	daily rain	90.6 mm (3.6 in)	50.4 mm (2.0 in)	4 years	40 of 100 (Notable)
20 December 1986	Hatch, US	daily rain	27.9 mm (1.1 in)	11.4 mm (0.4 in)	48 years	40 of 100 (Notable)
20 December 1986	Matua, RU	daily rain	32.3 mm (1.3 in)	15.1 mm (0.6 in)	29 years	39 of 100 (Notable)
20 December 1986	Bulverde, US	daily rain	47.0 mm (1.9 in)	39.9 mm (1.6 in)	23 years	38 of 100 (Notable)
20 December 1986	Vytegra, RU	daily low min	-33.2 C (-27.8 F)	1.3 C (2.3 F)	91 years	37 of 100 (Notable)
20 December 1986	Ai-Petri, UA	daily rain	46.2 mm (1.8 in)	11.1 mm (0.4 in)	69 years	37 of 100 (Notable)
20 December 1986	Barra Mansa, BR	daily rain	77.5 mm (3.1 in)	37.5 mm (1.5 in)	23 years	34 of 100 (Routine)
20 December 1986	Altamirano (Smn), MX	daily rain	28.7 mm (1.1 in)	16.8 mm (0.7 in)	21 years	32 of 100 (Routine)
20 December 1986	Delta, US	daily high max	15.6 C (60.1 F)	1.2 C (2.2 F)	64 years	30 of 100 (Routine)
20 December 1986	Pereque, BR	daily rain	79.3 mm (3.1 in)	27.8 mm (1.1 in)	32 years	28 of 100 (Routine)
20 December 1986	Oravska Lesna, SK	daily rain	31.8 mm (1.3 in)	11.4 mm (0.4 in)	20 years	27 of 100 (Routine)
20 December 1986	Rodovia Anchieta-Cota 400, BR	daily rain	115.2 mm (4.5 in)	38.5 mm (1.5 in)	32 years	26 of 100 (Routine)
20 December 1986	Kvikkjokk-Arrenjarka, SE	daily low max	-30.4 C (-22.7 F)	1.4 C (2.5 F)	60 years	26 of 100 (Routine)
20 December 1986	Ana Dias, BR	daily rain	64.6 mm (2.5 in)	33.9 mm (1.3 in)	13 years	25 of 100 (Routine)
20 December 1986	Cedral, MX	daily high min	8.9 C (48.0 F)	0.6 C (1.1 F)	60 years	25 of 100 (Routine)
20 December 1986	Malmberget, SE	monthly low max	-27.0 C (-16.6 F)	1.4 C (2.5 F)	30 years	25 of 100 (Routine)
20 December 1986	Ubatuba, BR	daily rain	104.8 mm (4.1 in)	20.4 mm (0.8 in)	39 years	24 of 100 (Routine)

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 1986

Records set or tied on this calendar date in each year from 1793 to 1986. 1986 had 321 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 1986-12-20: 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 20	224
20 to 40	15
40 to 60	2
60 to 80	1
80 to 100	0
100 to 120	1
120 to 140	1