Weather Records on 18 September 1966

498 weather records were set or tied worldwide on 18 September 1966. Highest significance: Hvar, HR.

Key Facts for 18 September 1966

On 18 September 1966, 498 weather records were set or tied at long-record stations worldwide.
156 were record highs and 117 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 9 monthly and 489 daily.
Hvar set a daily record precipitation of 108.3 mm (4.3 in) on 18 September 1966.
Across 163 earlier years (1803 to 2026) the same calendar date averaged 421 records.

Record Map

498 stations

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

Weather records on 18 September 1966: highest significance records shown on the map
Station	Country	Type	Value	Significance
Hvar	Croatia	Record daily precipitation	108.3 mm (4.3 in)	54 of 100 (Notable)
Grants Pass	United States	Record daily precipitation	37.1 mm (1.5 in)	54 of 100 (Notable)
Bellary	India	Record daily precipitation	114.0 mm (4.5 in)	48 of 100 (Notable)
Harihar	India	Record daily precipitation	91.4 mm (3.6 in)	45 of 100 (Notable)
Grootfontein	Namibia	Record daily precipitation	41.0 mm (1.6 in)	44 of 100 (Notable)
Oatlands	South Africa	Record daily precipitation	66.0 mm (2.6 in)	43 of 100 (Notable)
Carrabelle 1 NNW	United States	Record daily precipitation	94.7 mm (3.7 in)	43 of 100 (Notable)
Puerto Vallarta	Mexico	Record daily precipitation	144.8 mm (5.7 in)	41 of 100 (Notable)
Palmaryville	South Africa	Record daily precipitation	40.3 mm (1.6 in)	40 of 100 (Notable)
Monroe City	United States	Record daily precipitation	36.1 mm (1.4 in)	40 of 100 (Notable)
Bowie	United States	Record daily precipitation	33.0 mm (1.3 in)	40 of 100 (Notable)
Maun	Botswana	Record daily precipitation	25.8 mm (1.0 in)	39 of 100 (Notable)
Ely AP	United States	Record daily precipitation	25.9 mm (1.0 in)	39 of 100 (Notable)
Luroy	Norway	Record daily precipitation	86.2 mm (3.4 in)	38 of 100 (Notable)
Apalachicola AP	United States	Record daily precipitation	191.3 mm (7.5 in)	38 of 100 (Notable)
Erode	India	Record daily precipitation	48.2 mm (1.9 in)	37 of 100 (Notable)
Tygerfontein	South Africa	Record daily precipitation	46.0 mm (1.8 in)	37 of 100 (Notable)
Kaallaagte	South Africa	Record daily precipitation	32.5 mm (1.3 in)	36 of 100 (Notable)
Crescent City 3 NNW	United States	Record daily precipitation	59.2 mm (2.3 in)	36 of 100 (Notable)
Clayton 1 SSW	United States	Record low maximum temperature	17.2 C (63.0 F)	36 of 100 (Notable)
Chickamauga 2 SW	United States	Record low maximum temperature	18.9 C (66.0 F)	36 of 100 (Notable)
Disston 1 NE Laying Ck	United States	Record daily precipitation	32.8 mm (1.3 in)	36 of 100 (Notable)
Paola	United States	Record daily precipitation	39.6 mm (1.6 in)	35 of 100 (Notable)
Prospect 2 SW	United States	Record daily precipitation	28.7 mm (1.1 in)	35 of 100 (Notable)
Merensky (Skl)	South Africa	Record daily precipitation	25.0 mm (1.0 in)	33 of 100 (Routine)
Calera	United States	Record daily precipitation	46.5 mm (1.8 in)	33 of 100 (Routine)
Edgerton	United States	Record daily precipitation	54.6 mm (2.1 in)	33 of 100 (Routine)
Sayre	United States	Record daily precipitation	43.9 mm (1.7 in)	33 of 100 (Routine)
Hambantota	Sri Lanka	Record high minimum temperature	25.9 C (78.6 F)	32 of 100 (Routine)
Huajuapan de Leon (Smn)	Mexico	Record daily precipitation	47.8 mm (1.9 in)	32 of 100 (Routine)
Ft Jones Rs	United States	Record daily precipitation	28.2 mm (1.1 in)	32 of 100 (Routine)
Eureka 1E	United States	Record daily precipitation	38.1 mm (1.5 in)	32 of 100 (Routine)
Sivaganga	India	Record daily precipitation	59.0 mm (2.3 in)	31 of 100 (Routine)
Valley Head	United States	Record low maximum temperature	17.8 C (64.0 F)	31 of 100 (Routine)
Yreka	United States	Record daily precipitation	26.7 mm (1.1 in)	31 of 100 (Routine)
Cedartown	United States	Record daily precipitation	38.6 mm (1.5 in)	31 of 100 (Routine)
Walhalla	United States	Record low maximum temperature	18.3 C (64.9 F)	31 of 100 (Routine)
Perth Regional Office	Australia	Record daily precipitation	47.2 mm (1.9 in)	30 of 100 (Routine)
Ramnagaram	India	Record daily precipitation	74.4 mm (2.9 in)	30 of 100 (Routine)
Athens	United States	Record low maximum temperature	18.9 C (66.0 F)	30 of 100 (Routine)
Gainesville	United States	Record low maximum temperature	17.8 C (64.0 F)	30 of 100 (Routine)
Rome	United States	Record low maximum temperature	18.9 C (66.0 F)	30 of 100 (Routine)
Natchez	United States	Record daily precipitation	72.9 mm (2.9 in)	30 of 100 (Routine)
Medicine Hat A	Canada	Record high maximum temperature	33.3 C (91.9 F)	29 of 100 (Routine)
Milstead	United States	Record daily precipitation	33.3 mm (1.3 in)	29 of 100 (Routine)
Lecompton	United States	Record daily precipitation	42.2 mm (1.7 in)	29 of 100 (Routine)
Highlands	United States	Record low maximum temperature	14.4 C (57.9 F)	29 of 100 (Routine)
New Braunfels	United States	Record low maximum temperature	24.4 C (75.9 F)	29 of 100 (Routine)
Ranfurly	Canada	Record high minimum temperature	11.1 C (52.0 F)	28 of 100 (Routine)
Newport	United States	Record low maximum temperature	21.1 C (70.0 F)	28 of 100 (Routine)
Erick	United States	Record daily precipitation	34.8 mm (1.4 in)	28 of 100 (Routine)
Grapevine Dam	United States	Record low maximum temperature	23.9 C (75.0 F)	28 of 100 (Routine)
Ferrara	Italy	Record daily precipitation	44.3 mm (1.7 in)	27 of 100 (Routine)
Cornelia	United States	Record low maximum temperature	16.1 C (61.0 F)	27 of 100 (Routine)
Marshall	United States	Record low maximum temperature	16.7 C (62.1 F)	27 of 100 (Routine)
Cameron	United States	Record daily precipitation	34.0 mm (1.3 in)	27 of 100 (Routine)
Steigen	Norway	Record daily precipitation	25.2 mm (1.0 in)	26 of 100 (Routine)
Chester	United States	Record high maximum temperature	32.2 C (90.0 F)	26 of 100 (Routine)
Munday	United States	Record daily precipitation	40.9 mm (1.6 in)	26 of 100 (Routine)
Chiautla de Tapia	Mexico	Record daily precipitation	44.2 mm (1.7 in)	25 of 100 (Routine)

Counts by Type and Timescale

498 records

Records set or tied on 18 September 1966 by type: Highest daily maximum 73, Lowest daily maximum 90, Highest daily minimum 83, Lowest daily minimum 27, Heaviest daily rainfall 225.

Records on 18 September 1966 by type
Record type	Records
Highest daily maximum	73
Lowest daily maximum	90
Highest daily minimum	83
Lowest daily minimum	27
Heaviest daily rainfall	225
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 18 September 1966 by timescale: all-time 0, monthly 9, daily 489.

How Much Records Were Beaten By

417 broken records

Margins by which the 417 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 94.3. Ties are not counted.

Top 20 by Significance

18 September 1966

Top 20 records on 18 September 1966 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 September 1966	Hvar, HR	daily rain	108.3 mm (4.3 in)	54.8 mm (2.2 in)	13 years	54 of 100 (Notable)
18 September 1966	Grants Pass, US	daily rain	37.1 mm (1.5 in)	24.7 mm (1.0 in)	25 years	54 of 100 (Notable)
18 September 1966	Bellary, IN	daily rain	114.0 mm (4.5 in)	58.1 mm (2.3 in)	21 years	48 of 100 (Notable)
18 September 1966	Harihar, IN	daily rain	91.4 mm (3.6 in)	44.4 mm (1.7 in)	48 years	45 of 100 (Notable)
18 September 1966	Grootfontein, NA	monthly rain	41.0 mm (1.6 in)	26.0 mm (1.0 in)	12 years	44 of 100 (Notable)
18 September 1966	Oatlands, ZA	monthly rain	66.0 mm (2.6 in)	26.5 mm (1.0 in)	8 years	43 of 100 (Notable)
18 September 1966	Carrabelle 1 NNW, US	daily rain	94.7 mm (3.7 in)	66.3 mm (2.6 in)	52 years	43 of 100 (Notable)
18 September 1966	Puerto Vallarta, MX	daily rain	144.8 mm (5.7 in)	74.9 mm (2.9 in)	15 years	41 of 100 (Notable)
18 September 1966	Palmaryville, ZA	daily rain	40.3 mm (1.6 in)	32.3 mm (1.3 in)	9 years	40 of 100 (Notable)
18 September 1966	Monroe City, US	daily rain	36.1 mm (1.4 in)	25.9 mm (1.0 in)	61 years	40 of 100 (Notable)
18 September 1966	Bowie, US	daily rain	33.0 mm (1.3 in)	28.9 mm (1.1 in)	59 years	40 of 100 (Notable)
18 September 1966	Maun, BW	monthly rain	25.8 mm (1.0 in)	17.7 mm (0.7 in)	27 years	39 of 100 (Notable)
18 September 1966	Ely AP, US	daily rain	25.9 mm (1.0 in)	18.0 mm (0.7 in)	3 years	39 of 100 (Notable)
18 September 1966	Luroy, NO	daily rain	86.2 mm (3.4 in)	49.4 mm (1.9 in)	21 years	38 of 100 (Notable)
18 September 1966	Apalachicola AP, US	daily rain	191.3 mm (7.5 in)	94.3 mm (3.7 in)	19 years	38 of 100 (Notable)
18 September 1966	Erode, IN	daily rain	48.2 mm (1.9 in)	22.3 mm (0.9 in)	55 years	37 of 100 (Notable)
18 September 1966	Tygerfontein, ZA	daily rain	46.0 mm (1.8 in)	33.0 mm (1.3 in)	9 years	37 of 100 (Notable)
18 September 1966	Kaallaagte, ZA	daily rain	32.5 mm (1.3 in)	20.6 mm (0.8 in)	21 years	36 of 100 (Notable)
18 September 1966	Crescent City 3 NNW, US	daily rain	59.2 mm (2.3 in)	19.6 mm (0.8 in)	52 years	36 of 100 (Notable)
18 September 1966	Clayton 1 SSW, US	daily low max	17.2 C (63.0 F)	3.9 C (7.0 F)	64 years	36 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

1803 to 1966

Records set or tied on this calendar date in each year from 1803 to 1966. 1966 had 498 records.

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

Records on 09-18 in each year
Year	Records
1803	1
1811	1
1814	1
1819	1
1829	1
1832	1
1834	1
1835	1
1837	2
1847	2
1848	1
1849	1
1851	4
1859	1
1861	1
1865	1
1869	1
1871	1
1875	1
1876	2
1877	1
1879	1
1880	1
1881	1
1882	1
1885	1
1886	4
1889	6
1890	1
1891	1
1893	4
1894	2
1895	2
1896	4
1897	3
1898	5
1899	3
1900	2
1901	10
1902	8
1903	58
1904	6
1905	22
1906	16
1907	4
1908	11
1909	17
1910	5
1911	8
1912	43
1913	44
1914	56
1915	41
1916	58
1917	99
1918	57
1919	48
1920	56
1921	213
1922	45
1923	114
1924	62
1925	269
1926	205
1927	189
1928	114
1929	309
1930	124
1931	429
1932	226
1933	370
1934	188
1935	281
1936	155
1937	422
1938	373
1939	190
1940	402
1941	318
1942	1,001
1943	624
1944	503
1945	732
1946	576
1947	927
1948	427
1949	356
1950	370
1951	320
1952	340
1953	245
1954	446
1955	672
1956	587
1957	429
1958	491
1959	829
1960	351
1961	478
1962	360
1963	453
1964	282
1965	1,172
1966	498
1967	357
1968	763
1969	424
1970	377
1971	1,245
1972	691
1973	593
1974	559
1975	976
1976	615
1977	619
1978	1,162
1979	709
1980	652
1981	1,671
1982	603
1983	936
1984	951
1985	636
1986	730
1987	1,244
1988	997
1989	778
1990	904
1991	1,377
1992	821
1993	747
1994	852
1995	935
1996	1,237
1997	935
1998	1,038
1999	583
2000	1,146
2001	993
2002	828
2003	815
2004	1,027
2005	781
2006	1,309
2007	670
2008	697
2009	692
2010	1,040
2011	1,050
2012	922
2013	666
2014	682
2015	934
2016	893
2017	518
2018	1,200
2019	768
2020	682
2021	582
2022	613
2023	639
2024	687
2025	471
2026	864

Download the Data

Data for records on 1966-09-18: 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	388
20 to 40	22
40 to 60	4
60 to 80	2
80 to 100	1