Weather Records on 17 December 1986

743 weather records were set or tied worldwide on 17 December 1986. Highest significance: Samalayuca, MX.

Key Facts for 17 December 1986

On 17 December 1986, 743 weather records were set or tied at long-record stations worldwide.
195 were record highs and 91 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 15 monthly and 727 daily.
Samalayuca set an all-time record daily precipitation of 104.9 mm (4.1 in) on 17 December 1986.
Across 160 earlier years (1793 to 2025) the same calendar date averaged 461 records.

Record Map

743 stations

743 station records on 17 December 1986 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 December 1986: highest significance records shown on the map
Station	Country	Type	Value	Significance
Samalayuca	Mexico	Record daily precipitation	104.9 mm (4.1 in)	72 of 100 (Major)
Cape Otway Lighthouse	Australia	Record daily precipitation	58.8 mm (2.3 in)	66 of 100 (Major)
Yambacoona	Australia	Record daily precipitation	42.2 mm (1.7 in)	65 of 100 (Major)
Izmail	Ukraine	Record daily precipitation	73.9 mm (2.9 in)	65 of 100 (Major)
Mortlake	Australia	Record daily precipitation	37.0 mm (1.5 in)	64 of 100 (Major)
Apollo Bay	Australia	Record daily precipitation	49.6 mm (2.0 in)	59 of 100 (Notable)
Divnoe	Russia	Record daily precipitation	28.7 mm (1.1 in)	59 of 100 (Notable)
Dandongadale (Mountain View)	Australia	Record daily precipitation	62.0 mm (2.4 in)	58 of 100 (Notable)
Bealiba	Australia	Record daily precipitation	35.6 mm (1.4 in)	56 of 100 (Notable)
Currie Post Office	Australia	Record daily precipitation	31.8 mm (1.3 in)	56 of 100 (Notable)
Tarwin Lower (Riverside)	Australia	Record daily precipitation	27.4 mm (1.1 in)	55 of 100 (Notable)
Irishtown	Australia	Record daily precipitation	38.4 mm (1.5 in)	54 of 100 (Notable)
Naracoopa	Australia	Record daily precipitation	36.6 mm (1.4 in)	52 of 100 (Notable)
Box Hill Aged Mens Retreat	Australia	Record daily precipitation	35.2 mm (1.4 in)	50 of 100 (Notable)
Woolsthorpe	Australia	Record daily precipitation	27.0 mm (1.1 in)	50 of 100 (Notable)
Garden City	United States	Record daily precipitation	32.0 mm (1.3 in)	50 of 100 (Notable)
St Arnaud	Australia	Record daily precipitation	25.0 mm (1.0 in)	49 of 100 (Notable)
Goorambat	Australia	Record daily precipitation	26.4 mm (1.0 in)	49 of 100 (Notable)
Whitlands (Burder's Lane)	Australia	Record daily precipitation	57.4 mm (2.3 in)	48 of 100 (Notable)
Tombstone	United States	Record daily precipitation	33.0 mm (1.3 in)	48 of 100 (Notable)
Jimenez (Smn)	Mexico	Record high minimum temperature	15.0 C (59.0 F)	47 of 100 (Notable)
Wonthaggi	Australia	Record daily precipitation	37.2 mm (1.5 in)	46 of 100 (Notable)
Meredith	Australia	Record daily precipitation	32.4 mm (1.3 in)	46 of 100 (Notable)
Jamieson	Australia	Record daily precipitation	34.0 mm (1.3 in)	45 of 100 (Notable)
Mount Buffalo Chalet	Australia	Record daily precipitation	57.0 mm (2.2 in)	45 of 100 (Notable)
Anakie	Australia	Record daily precipitation	27.0 mm (1.1 in)	45 of 100 (Notable)
Angatuba	Brazil	Record daily precipitation	94.1 mm (3.7 in)	45 of 100 (Notable)
Minyip (Post Office)	Australia	Record daily precipitation	26.8 mm (1.1 in)	44 of 100 (Notable)
Harrietville	Australia	Record daily precipitation	42.2 mm (1.7 in)	44 of 100 (Notable)
Moutajup	Australia	Record daily precipitation	27.5 mm (1.1 in)	44 of 100 (Notable)
Harwell	Australia	Record daily precipitation	39.8 mm (1.6 in)	44 of 100 (Notable)
Biser	Russia	Record low minimum temperature	-42.3 C (-44.1 F)	44 of 100 (Notable)
Fish Creek	Australia	Record daily precipitation	35.4 mm (1.4 in)	43 of 100 (Notable)
Cobden (Post Office)	Australia	Record daily precipitation	37.4 mm (1.5 in)	43 of 100 (Notable)
Milan	Italy	Record high maximum temperature	15.4 C (59.7 F)	43 of 100 (Notable)
Durdidwarrah	Australia	Record daily precipitation	27.0 mm (1.1 in)	42 of 100 (Notable)
Warracknabeal (Ailsa)	Australia	Record daily precipitation	27.0 mm (1.1 in)	41 of 100 (Notable)
Carboor	Australia	Record daily precipitation	27.2 mm (1.1 in)	41 of 100 (Notable)
Inverloch	Australia	Record daily precipitation	34.2 mm (1.3 in)	41 of 100 (Notable)
Lilydale	Australia	Record daily precipitation	34.4 mm (1.4 in)	41 of 100 (Notable)
Coranderrk Badger Weir	Australia	Record daily precipitation	31.0 mm (1.2 in)	41 of 100 (Notable)
Beeac (Post Office)	Australia	Record daily precipitation	25.8 mm (1.0 in)	41 of 100 (Notable)
Bogong	Australia	Record daily precipitation	43.4 mm (1.7 in)	40 of 100 (Notable)
Oakleigh (Metropolitan Golf Cl	Australia	Record daily precipitation	32.6 mm (1.3 in)	40 of 100 (Notable)
Bowie	United States	Record daily precipitation	29.5 mm (1.2 in)	40 of 100 (Notable)
Red Hill South	Australia	Record daily precipitation	27.0 mm (1.1 in)	39 of 100 (Notable)
Weeaproinah	Australia	Record daily precipitation	60.6 mm (2.4 in)	39 of 100 (Notable)
El Rosarito	Mexico	Record daily precipitation	54.9 mm (2.2 in)	39 of 100 (Notable)
Breckenridge	United States	Record daily precipitation	26.7 mm (1.1 in)	38 of 100 (Notable)
McCamey	United States	Record daily precipitation	31.5 mm (1.2 in)	38 of 100 (Notable)
Ringwood	Australia	Record daily precipitation	42.8 mm (1.7 in)	37 of 100 (Notable)
Alexandra (Acheron)	Australia	Record daily precipitation	25.4 mm (1.0 in)	37 of 100 (Notable)
Yolla (Sea View)	Australia	Record daily precipitation	29.8 mm (1.2 in)	37 of 100 (Notable)
Troicko-Pecherskoe	Russia	Record low minimum temperature	-48.4 C (-55.1 F)	37 of 100 (Notable)
Perm	Russia	Record low minimum temperature	-37.8 C (-36.0 F)	37 of 100 (Notable)
Anadarko 3 E	United States	Record high minimum temperature	7.8 C (46.0 F)	37 of 100 (Notable)
Agnes River	Australia	Record daily precipitation	29.0 mm (1.1 in)	36 of 100 (Notable)
Leongatha Sth Gippsland Water	Australia	Record daily precipitation	26.0 mm (1.0 in)	36 of 100 (Notable)
Croydon (Samuel Street)	Australia	Record daily precipitation	41.8 mm (1.6 in)	36 of 100 (Notable)
Timasevskaja	Russia	Record daily precipitation	26.3 mm (1.0 in)	36 of 100 (Notable)

Counts by Type and Timescale

743 records

Records set or tied on 17 December 1986 by type: Highest daily maximum 57, Lowest daily maximum 37, Highest daily minimum 138, Lowest daily minimum 54, Heaviest daily rainfall 448, Heaviest daily snowfall 5, Deepest snow cover 4.

Records on 17 December 1986 by type
Record type	Records
Highest daily maximum	57
Lowest daily maximum	37
Highest daily minimum	138
Lowest daily minimum	54
Heaviest daily rainfall	448
Heaviest daily snowfall	5
Deepest snow cover	4

Records on 17 December 1986 by timescale: all-time 1, monthly 15, daily 727.

How Much Records Were Beaten By

654 broken records

Margins by which the 654 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 51.0. Ties are not counted.

Top 20 by Significance

17 December 1986

Top 20 records on 17 December 1986 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 December 1986	Samalayuca, MX	all-time rain	104.9 mm (4.1 in)	27.9 mm (1.1 in)	28 years	72 of 100 (Major)
17 December 1986	Cape Otway Lighthouse, AU	monthly rain	58.8 mm (2.3 in)	14.6 mm (0.6 in)	70 years	66 of 100 (Major)
17 December 1986	Yambacoona, AU	daily rain	42.2 mm (1.7 in)	25.4 mm (1.0 in)	67 years	65 of 100 (Major)
17 December 1986	Izmail, UA	monthly rain	73.9 mm (2.9 in)	32.8 mm (1.3 in)	16 years	65 of 100 (Major)
17 December 1986	Mortlake, AU	daily rain	37.0 mm (1.5 in)	21.5 mm (0.8 in)	65 years	64 of 100 (Major)
17 December 1986	Apollo Bay, AU	daily rain	49.6 mm (2.0 in)	27.2 mm (1.1 in)	63 years	59 of 100 (Notable)
17 December 1986	Divnoe, RU	daily rain	28.7 mm (1.1 in)	14.7 mm (0.6 in)	47 years	59 of 100 (Notable)
17 December 1986	Dandongadale (Mountain View), AU	daily rain	62.0 mm (2.4 in)	33.8 mm (1.3 in)	81 years	58 of 100 (Notable)
17 December 1986	Bealiba, AU	daily rain	35.6 mm (1.4 in)	25.7 mm (1.0 in)	49 years	56 of 100 (Notable)
17 December 1986	Currie Post Office, AU	daily rain	31.8 mm (1.3 in)	20.1 mm (0.8 in)	60 years	56 of 100 (Notable)
17 December 1986	Tarwin Lower (Riverside), AU	daily rain	27.4 mm (1.1 in)	13.4 mm (0.5 in)	94 years	55 of 100 (Notable)
17 December 1986	Irishtown, AU	daily rain	38.4 mm (1.5 in)	24.7 mm (1.0 in)	60 years	54 of 100 (Notable)
17 December 1986	Naracoopa, AU	daily rain	36.6 mm (1.4 in)	22.4 mm (0.9 in)	40 years	52 of 100 (Notable)
17 December 1986	Box Hill Aged Mens Retreat, AU	daily rain	35.2 mm (1.4 in)	22.8 mm (0.9 in)	65 years	50 of 100 (Notable)
17 December 1986	Woolsthorpe, AU	daily rain	27.0 mm (1.1 in)	9.0 mm (0.35 in)	84 years	50 of 100 (Notable)
17 December 1986	Garden City, US	daily rain	32.0 mm (1.3 in)	30.5 mm (1.2 in)	20 years	50 of 100 (Notable)
17 December 1986	St Arnaud, AU	daily rain	25.0 mm (1.0 in)	15.3 mm (0.6 in)	60 years	49 of 100 (Notable)
17 December 1986	Goorambat, AU	daily rain	26.4 mm (1.0 in)	15.0 mm (0.6 in)	80 years	49 of 100 (Notable)
17 December 1986	Whitlands (Burder's Lane), AU	daily rain	57.4 mm (2.3 in)	39.6 mm (1.6 in)	56 years	48 of 100 (Notable)
17 December 1986	Tombstone, US	daily rain	33.0 mm (1.3 in)	20.3 mm (0.8 in)	24 years	48 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 1986

Records set or tied on this calendar date in each year from 1793 to 1986. 1986 had 743 records.

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

Records on 12-17 in each year
Year	Records
1793	2
1796	1
1806	2
1808	2
1814	1
1815	1
1839	1
1845	1
1846	4
1847	1
1848	1
1859	3
1866	1
1867	1
1868	1
1869	2
1873	2
1876	3
1877	2
1878	1
1879	2
1881	2
1885	1
1886	1
1888	2
1889	2
1890	4
1892	4
1893	2
1894	4
1895	3
1896	4
1897	4
1898	2
1899	1
1900	6
1901	5
1902	47
1903	2
1904	14
1905	2
1906	17
1907	9
1908	13
1909	5
1910	37
1911	12
1912	15
1913	21
1914	17
1915	31
1916	21
1917	21
1918	21
1919	109
1920	97
1921	94
1922	120
1923	170
1924	505
1925	79
1926	172
1927	143
1928	359
1929	221
1930	362
1931	217
1932	684
1933	710
1934	200
1935	87
1936	504
1937	379
1938	118
1939	1,126
1940	248
1941	261
1942	507
1943	444
1944	189
1945	621
1946	207
1947	258
1948	316
1949	296
1950	294
1951	773
1952	277
1953	283
1954	409
1955	419
1956	448
1957	686
1958	540
1959	548
1960	492
1961	911
1962	676
1963	531
1964	1,239
1965	482
1966	516
1967	1,121
1968	338
1969	238
1970	820
1971	781
1972	601
1973	1,016
1974	390
1975	474
1976	507
1977	1,024
1978	710
1979	951
1980	1,116
1981	1,354
1982	569
1983	1,264
1984	1,618
1985	1,210
1986	743
1987	1,191
1988	481
1989	2,905
1990	866
1991	577
1992	1,461
1993	761
1994	685
1995	956
1996	1,212
1997	1,279
1998	695
1999	901
2000	1,566
2001	1,262
2002	858
2003	751
2004	554
2005	806
2006	1,307
2007	1,100
2008	1,354
2009	926
2010	1,405
2011	430
2012	942
2013	718
2014	370
2015	1,378
2016	1,521
2017	408
2018	498
2019	917
2020	768
2021	908
2022	595
2023	931
2024	560
2025	1,198

Download the Data

Data for records on 1986-12-17: 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).

Histogram of margins by which records were beaten on 17 December 1986
Margin	Records
0 to 10	508
10 to 20	100
20 to 30	30
30 to 40	12
40 to 50	1
50 to 60	3