Weather Records on 18 October 1966

613 weather records were set or tied worldwide on 18 October 1966. Highest significance: Tirumayam, IN.

Key Facts for 18 October 1966

On 18 October 1966, 613 weather records were set or tied at long-record stations worldwide.
34 were record highs and 357 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 6 monthly and 607 daily.
Tirumayam set a daily record precipitation of 123.2 mm (4.9 in) on 18 October 1966.
Across 167 earlier years (1794 to 2025) the same calendar date averaged 433 records.

Record Map

613 stations

613 station records on 18 October 1966 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 October 1966: highest significance records shown on the map
Station	Country	Type	Value	Significance
Tirumayam	India	Record daily precipitation	123.2 mm (4.9 in)	53 of 100 (Notable)
Monticello Muni AP	United States	Record daily precipitation	40.4 mm (1.6 in)	52 of 100 (Notable)
Amersfoort (Pol)	South Africa	Record daily precipitation	60.0 mm (2.4 in)	50 of 100 (Notable)
Jeanerette 5 NW	United States	Record daily precipitation	62.2 mm (2.4 in)	46 of 100 (Notable)
Knoxville AP	United States	Record daily precipitation	57.4 mm (2.3 in)	46 of 100 (Notable)
Irapuato	Mexico	Record daily precipitation	41.7 mm (1.6 in)	43 of 100 (Notable)
De Wagendrift	South Africa	Record daily precipitation	44.0 mm (1.7 in)	42 of 100 (Notable)
Lares	Puerto Rico [United States]	Record low maximum temperature	24.4 C (75.9 F)	41 of 100 (Notable)
Bosbokrand (Pol)	South Africa	Record daily precipitation	116.0 mm (4.6 in)	41 of 100 (Notable)
Kattumavadi	India	Record daily precipitation	83.0 mm (3.3 in)	39 of 100 (Notable)
Bronkhorstspruit (Mun)	South Africa	Record daily precipitation	39.0 mm (1.5 in)	39 of 100 (Notable)
Karesuando	Sweden	Record snow depth	31.0 cm (12.2 in)	39 of 100 (Notable)
Ripley	United States	Record daily precipitation	28.2 mm (1.1 in)	39 of 100 (Notable)
Paling Yards (Ulabri)	Australia	Record daily precipitation	41.9 mm (1.6 in)	36 of 100 (Notable)
Theethandathanam	India	Record daily precipitation	165.0 mm (6.5 in)	36 of 100 (Notable)
Adirampatanam	India	Record daily precipitation	121.6 mm (4.8 in)	36 of 100 (Notable)
Guadalajara (Dge)	Mexico	Record daily precipitation	37.8 mm (1.5 in)	36 of 100 (Notable)
Sertania (Alagoa de Baixo)	Brazil	Record daily precipitation	43.0 mm (1.7 in)	35 of 100 (Notable)
Vattaram	India	Record daily precipitation	150.0 mm (5.9 in)	35 of 100 (Notable)
Tiruppathur	India	Record daily precipitation	78.2 mm (3.1 in)	35 of 100 (Notable)
Canton 4N	United States	Record daily precipitation	40.1 mm (1.6 in)	34 of 100 (Routine)
Waynesville 1 E	United States	Record daily precipitation	33.5 mm (1.3 in)	34 of 100 (Routine)
Sao Joao Do Tigre	Brazil	Record daily precipitation	36.8 mm (1.4 in)	33 of 100 (Routine)
Russellville	United States	Record low maximum temperature	12.8 C (55.0 F)	33 of 100 (Routine)
Ness City	United States	Record low maximum temperature	8.9 C (48.0 F)	33 of 100 (Routine)
Farmerville	United States	Record low maximum temperature	14.4 C (57.9 F)	33 of 100 (Routine)
Brevard	United States	Record daily precipitation	43.2 mm (1.7 in)	33 of 100 (Routine)
Salekhard	Russia	Record low minimum temperature	-22.1 C (-7.8 F)	32 of 100 (Routine)
New Iberia AP - Acadiana Rgnl	United States	Record daily precipitation	41.9 mm (1.6 in)	32 of 100 (Routine)
Harrison	United States	Record snow depth	10.2 cm (4.0 in)	32 of 100 (Routine)
Riverside	United States	Record daily precipitation	43.2 mm (1.7 in)	32 of 100 (Routine)
Kaliyal	India	Record daily precipitation	89.0 mm (3.5 in)	31 of 100 (Routine)
Kumbhakonam	India	Record daily precipitation	80.0 mm (3.1 in)	31 of 100 (Routine)
Pudukkottai	India	Record daily precipitation	72.0 mm (2.8 in)	31 of 100 (Routine)
Olekminsk	Russia	Record low minimum temperature	-19.5 C (-3.1 F)	31 of 100 (Routine)
Mtn Home 1 NNW	United States	Record low maximum temperature	11.7 C (53.1 F)	31 of 100 (Routine)
Kosciusko	United States	Record daily precipitation	40.6 mm (1.6 in)	31 of 100 (Routine)
Farmville	United States	Record low maximum temperature	13.9 C (57.0 F)	31 of 100 (Routine)
Saltspring Island	Canada	Record daily precipitation	37.3 mm (1.5 in)	30 of 100 (Routine)
Lyon - St Exupery	France	Record daily precipitation	37.3 mm (1.5 in)	30 of 100 (Routine)
Manantoddy	India	Record daily precipitation	52.3 mm (2.1 in)	30 of 100 (Routine)
Bridgeport 5 NW	United States	Record daily precipitation	47.0 mm (1.9 in)	30 of 100 (Routine)
Hope 3 NE	United States	Record low maximum temperature	14.4 C (57.9 F)	30 of 100 (Routine)
Rogersville 1 NE	United States	Record daily precipitation	42.4 mm (1.7 in)	30 of 100 (Routine)
Texas Downs	Australia	Record daily precipitation	34.8 mm (1.4 in)	29 of 100 (Routine)
Langet	India	Record daily precipitation	41.0 mm (1.6 in)	29 of 100 (Routine)
Walden	United States	Record low maximum temperature	4.4 C (39.9 F)	29 of 100 (Routine)
Jennings	United States	Record daily precipitation	39.6 mm (1.6 in)	29 of 100 (Routine)
Honomu Mauka 138	United States	Record daily precipitation	90.4 mm (3.6 in)	29 of 100 (Routine)
Praha-Klementinum	Czech Republic	Record high minimum temperature	12.6 C (54.7 F)	28 of 100 (Routine)
Natchitoches	United States	Record low maximum temperature	18.3 C (64.9 F)	28 of 100 (Routine)
Rayne 6 N	United States	Record daily precipitation	37.3 mm (1.5 in)	28 of 100 (Routine)
Frostburg	United States	Record low maximum temperature	6.1 C (43.0 F)	28 of 100 (Routine)
Millington 1 SE	United States	Record low maximum temperature	11.1 C (52.0 F)	28 of 100 (Routine)
Mtn Grove 2 N	United States	Record low maximum temperature	8.9 C (48.0 F)	28 of 100 (Routine)
Westfield 2 SSE	United States	Record low minimum temperature	-0.6 C (30.9 F)	28 of 100 (Routine)
Roswell Muni AP	United States	Record low minimum temperature	-3.9 C (25.0 F)	28 of 100 (Routine)
Tiruvarur	India	Record daily precipitation	81.6 mm (3.2 in)	27 of 100 (Routine)
Pattukkottai	India	Record daily precipitation	130.8 mm (5.1 in)	27 of 100 (Routine)
Rosherville (Pow)	South Africa	Record daily precipitation	27.0 mm (1.1 in)	27 of 100 (Routine)

Counts by Type and Timescale

613 records

Records set or tied on 18 October 1966 by type: Highest daily maximum 5, Lowest daily maximum 253, Highest daily minimum 29, Lowest daily minimum 104, Heaviest daily rainfall 213, Heaviest daily snowfall 2, Deepest snow cover 7.

Records on 18 October 1966 by type
Record type	Records
Highest daily maximum	5
Lowest daily maximum	253
Highest daily minimum	29
Lowest daily minimum	104
Heaviest daily rainfall	213
Heaviest daily snowfall	2
Deepest snow cover	7

Records on 18 October 1966 by timescale: all-time 0, monthly 6, daily 607.

How Much Records Were Beaten By

489 broken records

Margins by which the 489 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 150.0. Ties are not counted.

Top 20 by Significance

18 October 1966

Top 20 records on 18 October 1966 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 October 1966	Tirumayam, IN	daily rain	123.2 mm (4.9 in)	52.1 mm (2.1 in)	61 years	53 of 100 (Notable)
18 October 1966	Monticello Muni AP, US	daily rain	40.4 mm (1.6 in)	25.9 mm (1.0 in)	89 years	52 of 100 (Notable)
18 October 1966	Amersfoort (Pol), ZA	daily rain	60.0 mm (2.4 in)	33.3 mm (1.3 in)	56 years	50 of 100 (Notable)
18 October 1966	Jeanerette 5 NW, US	daily rain	62.2 mm (2.4 in)	46.2 mm (1.8 in)	49 years	46 of 100 (Notable)
18 October 1966	Knoxville AP, US	daily rain	57.4 mm (2.3 in)	38.6 mm (1.5 in)	28 years	46 of 100 (Notable)
18 October 1966	Irapuato, MX	daily rain	41.7 mm (1.6 in)	36.4 mm (1.4 in)	0 years	43 of 100 (Notable)
18 October 1966	De Wagendrift, ZA	daily rain	44.0 mm (1.7 in)	21.9 mm (0.9 in)	56 years	42 of 100 (Notable)
18 October 1966	Lares, PR	daily low max	24.4 C (75.9 F)	4.5 C (8.1 F)	17 years	41 of 100 (Notable)
18 October 1966	Bosbokrand (Pol), ZA	monthly rain	116.0 mm (4.6 in)	23.3 mm (0.9 in)	22 years	41 of 100 (Notable)
18 October 1966	Kattumavadi, IN	daily rain	83.0 mm (3.3 in)	37.0 mm (1.5 in)	53 years	39 of 100 (Notable)
18 October 1966	Bronkhorstspruit (Mun), ZA	daily rain	39.0 mm (1.5 in)	23.8 mm (0.9 in)	48 years	39 of 100 (Notable)
18 October 1966	Karesuando, SE	daily snow depth	31.0 cm (12.2 in)	15.0 cm (5.9 in)	24 years	39 of 100 (Notable)
18 October 1966	Ripley, US	daily rain	28.2 mm (1.1 in)	21.3 mm (0.8 in)	60 years	39 of 100 (Notable)
18 October 1966	Paling Yards (Ulabri), AU	daily rain	41.9 mm (1.6 in)	17.5 mm (0.7 in)	43 years	36 of 100 (Notable)
18 October 1966	Theethandathanam, IN	monthly rain	165.0 mm (6.5 in)	16.7 mm (0.7 in)	42 years	36 of 100 (Notable)
18 October 1966	Adirampatanam, IN	daily rain	121.6 mm (4.8 in)	49.7 mm (2.0 in)	16 years	36 of 100 (Notable)
18 October 1966	Guadalajara (Dge), MX	daily rain	37.8 mm (1.5 in)	34.0 mm (1.3 in)	7 years	36 of 100 (Notable)
18 October 1966	Sertania (Alagoa de Baixo), BR	daily rain	43.0 mm (1.7 in)	39.3 mm (1.5 in)	24 years	35 of 100 (Notable)
18 October 1966	Vattaram, IN	monthly rain	150.0 mm (5.9 in)	7.8 mm (0.31 in)	55 years	35 of 100 (Notable)
18 October 1966	Tiruppathur, IN	daily rain	78.2 mm (3.1 in)	35.0 mm (1.4 in)	37 years	35 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

1794 to 1966

Records set or tied on this calendar date in each year from 1794 to 1966. 1966 had 613 records.

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

Records on 10-18 in each year
Year	Records
1794	1
1796	1
1799	1
1806	1
1807	1
1810	1
1811	2
1817	1
1832	1
1835	1
1836	1
1843	1
1846	2
1848	1
1849	1
1851	1
1852	1
1859	1
1863	1
1865	2
1866	2
1868	1
1869	1
1871	1
1872	1
1874	4
1876	2
1877	2
1879	3
1881	1
1882	1
1883	2
1887	1
1888	1
1890	4
1892	4
1893	1
1894	3
1895	2
1897	6
1898	5
1899	12
1900	5
1901	5
1902	6
1903	9
1904	12
1905	27
1906	17
1907	11
1908	44
1909	23
1910	50
1911	22
1912	12
1913	26
1914	52
1915	12
1916	64
1917	109
1918	24
1919	31
1920	87
1921	87
1922	59
1923	114
1924	151
1925	153
1926	149
1927	309
1928	316
1929	190
1930	507
1931	350
1932	446
1933	264
1934	222
1935	360
1936	483
1937	671
1938	536
1939	475
1940	532
1941	240
1942	332
1943	844
1944	264
1945	398
1946	355
1947	965
1948	1,128
1949	665
1950	996
1951	325
1952	394
1953	678
1954	621
1955	403
1956	578
1957	220
1958	407
1959	246
1960	612
1961	362
1962	252
1963	492
1964	311
1965	1,066
1966	613
1967	405
1968	737
1969	789
1970	501
1971	1,199
1972	1,581
1973	789
1974	746
1975	779
1976	1,326
1977	533
1978	545
1979	555
1980	1,024
1981	680
1982	654
1983	684
1984	1,331
1985	831
1986	344
1987	518
1988	733
1989	1,196
1990	1,043
1991	999
1992	1,295
1993	1,051
1994	1,296
1995	1,227
1996	795
1997	1,240
1998	1,323
1999	773
2000	823
2001	818
2002	878
2003	1,097
2004	1,156
2005	755
2006	1,328
2007	1,298
2008	531
2009	1,546
2010	634
2011	736
2012	741
2013	430
2014	690
2015	915
2016	1,511
2017	590
2018	759
2019	346
2020	957
2021	387
2022	1,334
2023	693
2024	1,142
2025	367

Download the Data

Data for records on 1966-10-18: 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	447
20 to 40	32
40 to 60	6
60 to 80	1
80 to 100	0
100 to 120	2
120 to 140	0
140 to 160	1