Weather Records on 17 October 1986

354 weather records were set or tied worldwide on 17 October 1986. Highest significance: Koppiesvlei, ZA.

Key Facts for 17 October 1986

On 17 October 1986, 354 weather records were set or tied at long-record stations worldwide.
98 were record highs and 150 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 4 monthly and 349 daily.
Koppiesvlei set a monthly record daily precipitation of 89.5 mm (3.5 in) on 17 October 1986.
Across 162 earlier years (1793 to 2025) the same calendar date averaged 440 records.

Record Map

354 stations

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

Weather records on 17 October 1986: highest significance records shown on the map
Station	Country	Type	Value	Significance
Koppiesvlei	South Africa	Record daily precipitation	89.5 mm (3.5 in)	58 of 100 (Notable)
Salgado	Brazil	Record daily precipitation	84.3 mm (3.3 in)	56 of 100 (Notable)
Hollowaysrust	South Africa	Record daily precipitation	38.5 mm (1.5 in)	47 of 100 (Notable)
Youyang	China	Record daily precipitation	60.1 mm (2.4 in)	46 of 100 (Notable)
Schweizer-Reneke (Pol)	South Africa	Record daily precipitation	40.0 mm (1.6 in)	45 of 100 (Notable)
Driekop	South Africa	Record daily precipitation	35.5 mm (1.4 in)	37 of 100 (Notable)
Pismo Beach	United States	Record daily precipitation	30.5 mm (1.2 in)	37 of 100 (Notable)
Hamburg	United States	Record low maximum temperature	9.4 C (48.9 F)	37 of 100 (Notable)
Hammond	United States	Record low maximum temperature	20.6 C (69.1 F)	36 of 100 (Notable)
Sonnblick	Austria	Record high maximum temperature	7.0 C (44.6 F)	31 of 100 (Routine)
Syferfontein	South Africa	Record daily precipitation	38.5 mm (1.5 in)	30 of 100 (Routine)
Yichang	China	Record daily precipitation	39.4 mm (1.6 in)	29 of 100 (Routine)
Gijon la Merced	Spain	Record daily precipitation	40.9 mm (1.6 in)	28 of 100 (Routine)
Holly	United States	Record low minimum temperature	-6.7 C (19.9 F)	28 of 100 (Routine)
Apuka	Russia	Record low maximum temperature	-9.2 C (15.4 F)	27 of 100 (Routine)
Zugspitze	Germany	Record high maximum temperature	7.0 C (44.6 F)	26 of 100 (Routine)
Korf	Russia	Record low minimum temperature	-16.1 C (3.0 F)	26 of 100 (Routine)
Leeudoringstad (Skl)	South Africa	Record daily precipitation	32.0 mm (1.3 in)	26 of 100 (Routine)
Neverset	South Africa	Record daily precipitation	40.5 mm (1.6 in)	25 of 100 (Routine)
Blenheim Station	Australia	Record daily precipitation	44.6 mm (1.8 in)	24 of 100 (Routine)
Le Bourget	France	Record high minimum temperature	13.0 C (55.4 F)	24 of 100 (Routine)
Vestmannaeyjar	Iceland	Record daily precipitation	51.5 mm (2.0 in)	23 of 100 (Routine)
Aomori	Japan	Record low maximum temperature	8.6 C (47.5 F)	23 of 100 (Routine)
El Burrero	Mexico	Record high maximum temperature	30.6 C (87.1 F)	23 of 100 (Routine)
Las Vigas	Mexico	Record low minimum temperature	15.0 C (59.0 F)	23 of 100 (Routine)
Kaneohe Mauka 781	United States	Record low maximum temperature	25.0 C (77.0 F)	23 of 100 (Routine)
Machiques-Granja M.A.C.	Venezuela	Record daily precipitation	50.5 mm (2.0 in)	23 of 100 (Routine)
Poitiers - Biard	France	Record high minimum temperature	13.5 C (56.3 F)	22 of 100 (Routine)
Arteaga	Mexico	Record high minimum temperature	20.0 C (68.0 F)	22 of 100 (Routine)
Sretensk	Russia	Record low minimum temperature	-17.3 C (0.9 F)	22 of 100 (Routine)
Fazenda Belem	Brazil	Record daily precipitation	32.2 mm (1.3 in)	21 of 100 (Routine)
Iwamizawa	Japan	Record low maximum temperature	5.1 C (41.2 F)	21 of 100 (Routine)
Amealco	Mexico	Record high minimum temperature	12.8 C (55.0 F)	21 of 100 (Routine)
Campbell Island AWS	New Zealand	Record high maximum temperature	13.4 C (56.1 F)	21 of 100 (Routine)
Bothithong"Bothitho(Pol)"	South Africa	Record daily precipitation	25.0 mm (1.0 in)	21 of 100 (Routine)
Boolardy	Australia	Record daily precipitation	3.4 mm (0.13 in)	20 of 100 (Routine)
Narra Tarra	Australia	Record daily precipitation	4.6 mm (0.18 in)	20 of 100 (Routine)
Seven Oaks	Australia	Record daily precipitation	2.4 mm (0.09 in)	20 of 100 (Routine)
Wooroloo	Australia	Record daily precipitation	9.0 mm (0.35 in)	20 of 100 (Routine)
Represa	United States	Record daily precipitation	4.3 mm (0.17 in)	20 of 100 (Routine)
Leliefontein	South Africa	Record daily precipitation	19.0 mm (0.7 in)	20 of 100 (Routine)
Myrup	Australia	Record daily precipitation	10.4 mm (0.4 in)	20 of 100 (Routine)
Grootfontein	Namibia	Record daily precipitation	10.7 mm (0.4 in)	20 of 100 (Routine)
Headingly Station	Australia	Record daily precipitation	4.0 mm (0.16 in)	20 of 100 (Routine)
Beacon	Australia	Record daily precipitation	3.0 mm (0.12 in)	20 of 100 (Routine)
Moirton	South Africa	Record daily precipitation	13.5 mm (0.5 in)	20 of 100 (Routine)
La Quiaca Observato	Argentina	Record low maximum temperature	13.4 C (56.1 F)	20 of 100 (Routine)
Anningie	Australia	Record daily precipitation	10.6 mm (0.4 in)	20 of 100 (Routine)
Ibukiyama Mtn (Aut)	Japan	Record low minimum temperature	-1.9 C (28.6 F)	20 of 100 (Routine)
Tekax de Alvaro Obregon	Mexico	Record high maximum temperature	36.7 C (98.1 F)	20 of 100 (Routine)
Buckhorn	United States	Record daily precipitation	27.2 mm (1.1 in)	20 of 100 (Routine)
Condinup	Australia	Record daily precipitation	11.4 mm (0.4 in)	19 of 100 (Routine)
Guanghua	China	Record daily precipitation	22.2 mm (0.9 in)	19 of 100 (Routine)
Chongqing	China	Record daily precipitation	33.8 mm (1.3 in)	19 of 100 (Routine)
Teigarhorn	Iceland	Record daily precipitation	36.7 mm (1.4 in)	19 of 100 (Routine)
Fukaura	Japan	Record low maximum temperature	9.2 C (48.6 F)	19 of 100 (Routine)
Akita	Japan	Record low maximum temperature	9.8 C (49.6 F)	19 of 100 (Routine)
Tsurugisan	Japan	Record low maximum temperature	4.0 C (39.2 F)	19 of 100 (Routine)
Buran	Kazakhstan	Record daily precipitation	5.2 mm (0.20 in)	19 of 100 (Routine)
Tehuantepec	Mexico	Record high maximum temperature	38.9 C (102.0 F)	19 of 100 (Routine)

Counts by Type and Timescale

354 records

Records set or tied on 17 October 1986 by type: Highest daily maximum 39, Lowest daily maximum 88, Highest daily minimum 59, Lowest daily minimum 62, Heaviest daily rainfall 103, Heaviest daily snowfall 1, Deepest snow cover 2.

Records on 17 October 1986 by type
Record type	Records
Highest daily maximum	39
Lowest daily maximum	88
Highest daily minimum	59
Lowest daily minimum	62
Heaviest daily rainfall	103
Heaviest daily snowfall	1
Deepest snow cover	2

Records on 17 October 1986 by timescale: all-time 1, monthly 4, daily 349.

How Much Records Were Beaten By

273 broken records

Margins by which the 273 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 75.1. Ties are not counted.

Top 20 by Significance

17 October 1986

Top 20 records on 17 October 1986 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 October 1986	Koppiesvlei, ZA	monthly rain	89.5 mm (3.5 in)	40.5 mm (1.6 in)	10 years	58 of 100 (Notable)
17 October 1986	Salgado, BR	daily rain	84.3 mm (3.3 in)	75.1 mm (3.0 in)	40 years	56 of 100 (Notable)
17 October 1986	Hollowaysrust, ZA	daily rain	38.5 mm (1.5 in)	14.1 mm (0.6 in)	80 years	47 of 100 (Notable)
17 October 1986	Youyang, CN	daily rain	60.1 mm (2.4 in)	35.5 mm (1.4 in)	32 years	46 of 100 (Notable)
17 October 1986	Schweizer-Reneke (Pol), ZA	daily rain	40.0 mm (1.6 in)	29.0 mm (1.1 in)	32 years	45 of 100 (Notable)
17 October 1986	Driekop, ZA	daily rain	35.5 mm (1.4 in)	16.2 mm (0.6 in)	57 years	37 of 100 (Notable)
17 October 1986	Pismo Beach, US	daily rain	30.5 mm (1.2 in)	28.5 mm (1.1 in)	15 years	37 of 100 (Notable)
17 October 1986	Hamburg, US	daily low max	9.4 C (48.9 F)	1.2 C (2.2 F)	89 years	37 of 100 (Notable)
17 October 1986	Hammond, US	daily low max	20.6 C (69.1 F)	0.5 C (0.9 F)	89 years	36 of 100 (Notable)
17 October 1986	Sonnblick, AT	daily high max	7.0 C (44.6 F)	2.3 C (4.1 F)	56 years	31 of 100 (Routine)
17 October 1986	Syferfontein, ZA	daily rain	38.5 mm (1.5 in)	13.5 mm (0.5 in)	32 years	30 of 100 (Routine)
17 October 1986	Yichang, CN	daily rain	39.4 mm (1.6 in)	23.1 mm (0.9 in)	13 years	29 of 100 (Routine)
17 October 1986	Gijon la Merced, ES	daily rain	40.9 mm (1.6 in)	21.8 mm (0.9 in)	5 years	28 of 100 (Routine)
17 October 1986	Holly, US	daily low min	-6.7 C (19.9 F)	0.6 C (1.1 F)	64 years	28 of 100 (Routine)
17 October 1986	Apuka, RU	daily low max	-9.2 C (15.4 F)	6.2 C (11.2 F)	31 years	27 of 100 (Routine)
17 October 1986	Zugspitze, DE	daily high max	7.0 C (44.6 F)	1.0 C (1.8 F)	56 years	26 of 100 (Routine)
17 October 1986	Korf, RU	daily low min	-16.1 C (3.0 F)	3.1 C (5.6 F)	55 years	26 of 100 (Routine)
17 October 1986	Leeudoringstad (Skl), ZA	daily rain	32.0 mm (1.3 in)	9.1 mm (0.36 in)	44 years	26 of 100 (Routine)
17 October 1986	Neverset, ZA	daily rain	40.5 mm (1.6 in)	11.5 mm (0.5 in)	31 years	25 of 100 (Routine)
17 October 1986	Blenheim Station, AU	daily rain	44.6 mm (1.8 in)	31.0 mm (1.2 in)	0 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 354 records.

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

Records on 10-17 in each year
Year	Records
1793	1
1796	2
1808	2
1810	1
1811	1
1817	1
1820	1
1830	1
1836	1
1844	1
1845	1
1868	1
1869	2
1870	1
1872	1
1874	1
1875	1
1876	3
1877	1
1878	1
1879	7
1881	1
1882	1
1883	1
1884	2
1885	2
1886	1
1889	1
1890	3
1891	2
1892	6
1893	5
1894	2
1895	1
1897	3
1898	6
1899	3
1900	3
1901	3
1902	4
1903	9
1904	17
1905	12
1906	3
1907	16
1908	46
1909	18
1910	13
1911	24
1912	12
1913	26
1914	72
1915	7
1916	81
1917	29
1918	20
1919	34
1920	82
1921	64
1922	60
1923	149
1924	81
1925	324
1926	153
1927	163
1928	530
1929	119
1930	441
1931	431
1932	345
1933	190
1934	262
1935	337
1936	338
1937	865
1938	710
1939	424
1940	580
1941	194
1942	349
1943	1,173
1944	415
1945	289
1946	437
1947	744
1948	724
1949	442
1950	809
1951	274
1952	474
1953	463
1954	579
1955	562
1956	353
1957	245
1958	415
1959	403
1960	432
1961	525
1962	350
1963	513
1964	492
1965	920
1966	551
1967	576
1968	929
1969	714
1970	815
1971	1,053
1972	866
1973	542
1974	1,055
1975	605
1976	1,381
1977	1,060
1978	583
1979	468
1980	1,366
1981	555
1982	575
1983	526
1984	1,551
1985	585
1986	354
1987	828
1988	827
1989	1,163
1990	1,109
1991	1,352
1992	1,384
1993	1,001
1994	1,306
1995	1,076
1996	987
1997	1,114
1998	1,455
1999	815
2000	461
2001	878
2002	992
2003	764
2004	935
2005	643
2006	1,506
2007	690
2008	467
2009	1,606
2010	625
2011	734
2012	550
2013	516
2014	530
2015	843
2016	1,559
2017	743
2018	1,163
2019	504
2020	889
2021	294
2022	964
2023	544
2024	994
2025	363

Download the Data

Data for records on 1986-10-17: 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).

Margin	Records
0 to 10	249
10 to 20	14
20 to 30	6
30 to 40	2
40 to 50	1
50 to 60	0
60 to 70	0
70 to 80	1