Weather Records on 21 October 1966

425 weather records were set or tied worldwide on 21 October 1966. Highest significance: Sandford (Maydena), AU.

Key Facts for 21 October 1966

On 21 October 1966, 425 weather records were set or tied at long-record stations worldwide.
60 were record highs and 129 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 4 monthly and 421 daily.
Sandford (Maydena) set a daily record precipitation of 37.8 mm (1.5 in) on 21 October 1966.
Across 167 earlier years (1795 to 2025) the same calendar date averaged 420 records.

Record Map

425 stations

425 station records on 21 October 1966 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 October 1966: highest significance records shown on the map
Station	Country	Type	Value	Significance
Sandford (Maydena)	Australia	Record daily precipitation	37.8 mm (1.5 in)	63 of 100 (Major)
Jacobina	Brazil	Record daily precipitation	93.0 mm (3.7 in)	62 of 100 (Major)
Longmire Rainier Nps	United States	Record daily snowfall	15.2 cm (6.0 in)	55 of 100 (Notable)
Bellerive (Fort Street)	Australia	Record daily precipitation	28.4 mm (1.1 in)	53 of 100 (Notable)
Lencois	Brazil	Record daily precipitation	76.8 mm (3.0 in)	51 of 100 (Notable)
Risdon	Australia	Record daily precipitation	43.4 mm (1.7 in)	49 of 100 (Notable)
Fran?A	Brazil	Record daily precipitation	38.6 mm (1.5 in)	48 of 100 (Notable)
Hobart Botanical Gardens	Australia	Record daily precipitation	32.8 mm (1.3 in)	46 of 100 (Notable)
Cordova AP	United States	Record daily snowfall	23.9 cm (9.4 in)	46 of 100 (Notable)
Sidsjo	Sweden	Record daily precipitation	28.0 mm (1.1 in)	45 of 100 (Notable)
Seward AP	United States	Record daily snowfall	12.7 cm (5.0 in)	45 of 100 (Notable)
Wattle Hill	Australia	Record daily precipitation	61.2 mm (2.4 in)	44 of 100 (Notable)
Kenai AP	United States	Record daily snowfall	7.6 cm (3.0 in)	44 of 100 (Notable)
Manantoddy	India	Record daily precipitation	75.2 mm (3.0 in)	42 of 100 (Notable)
Buckland (Brockley)	Australia	Record daily precipitation	46.0 mm (1.8 in)	41 of 100 (Notable)
Putten (Gld)	Netherlands	Record daily precipitation	27.5 mm (1.1 in)	41 of 100 (Notable)
Longmire Rainier Nps	United States	Record snow depth	12.7 cm (5.0 in)	41 of 100 (Notable)
Marulan (Arthursleigh)	Australia	Record daily precipitation	30.0 mm (1.2 in)	39 of 100 (Notable)
Eaglehawk Neck (Jetty Road)	Australia	Record daily precipitation	40.1 mm (1.6 in)	39 of 100 (Notable)
Snoqualmie Pass	United States	Record daily snowfall	25.4 cm (10.0 in)	39 of 100 (Notable)
Itaberaba	Brazil	Record daily precipitation	33.2 mm (1.3 in)	38 of 100 (Notable)
Mehgawan	India	Record daily precipitation	79.2 mm (3.1 in)	38 of 100 (Notable)
Mullumbimby (Fairview Farm)	Australia	Record daily precipitation	63.8 mm (2.5 in)	37 of 100 (Notable)
Snowville	United States	Record low maximum temperature	-0.6 C (30.9 F)	37 of 100 (Notable)
Rokeby (the Mall)	Australia	Record daily precipitation	31.5 mm (1.2 in)	36 of 100 (Notable)
Anamalais	India	Record daily precipitation	82.0 mm (3.2 in)	36 of 100 (Notable)
Runnymede (Whitemarsh)	Australia	Record daily precipitation	49.3 mm (1.9 in)	35 of 100 (Notable)
Alur	India	Record daily precipitation	71.1 mm (2.8 in)	35 of 100 (Notable)
Toolamba	Australia	Record daily precipitation	43.2 mm (1.7 in)	34 of 100 (Routine)
Broadholm	South Africa	Record daily precipitation	40.0 mm (1.6 in)	34 of 100 (Routine)
Ravenshill	South Africa	Record daily precipitation	37.0 mm (1.5 in)	34 of 100 (Routine)
Nugent	Australia	Record daily precipitation	36.8 mm (1.4 in)	33 of 100 (Routine)
Lenah Valley (Augusta Road)	Australia	Record daily precipitation	31.5 mm (1.2 in)	33 of 100 (Routine)
Lindisfarne	Australia	Record daily precipitation	25.4 mm (1.0 in)	31 of 100 (Routine)
Premaydena Hatchery	Australia	Record daily precipitation	36.8 mm (1.4 in)	31 of 100 (Routine)
Zomerkomst (Bos)	South Africa	Record daily precipitation	47.0 mm (1.9 in)	31 of 100 (Routine)
Sulphur Springs	United States	Record low minimum temperature	-0.6 C (30.9 F)	31 of 100 (Routine)
Moab	United States	Record high minimum temperature	11.1 C (52.0 F)	31 of 100 (Routine)
Killora (Grasmere)	Australia	Record daily precipitation	28.2 mm (1.1 in)	30 of 100 (Routine)
Richmond (Brookbank)	Australia	Record daily precipitation	26.4 mm (1.0 in)	30 of 100 (Routine)
Blaine	United States	Record low maximum temperature	8.3 C (46.9 F)	30 of 100 (Routine)
Maria Island (Darlington)	Australia	Record daily precipitation	34.3 mm (1.4 in)	29 of 100 (Routine)
Debrecen Airport	Hungary	Record high minimum temperature	12.4 C (54.3 F)	29 of 100 (Routine)
Nagamangala	India	Record daily precipitation	43.0 mm (1.7 in)	29 of 100 (Routine)
Kotagiri	India	Record daily precipitation	68.6 mm (2.7 in)	29 of 100 (Routine)
Fig Tree	South Africa	Record daily precipitation	30.0 mm (1.2 in)	29 of 100 (Routine)
Inyoko	South Africa	Record daily precipitation	34.5 mm (1.4 in)	29 of 100 (Routine)
Brady	United States	Record low minimum temperature	2.2 C (36.0 F)	29 of 100 (Routine)
Cannanore	India	Record daily precipitation	73.0 mm (2.9 in)	28 of 100 (Routine)
Vilnius	Lithuania	Record high minimum temperature	9.3 C (48.7 F)	28 of 100 (Routine)
Middlekop (Bos)	South Africa	Record daily precipitation	43.0 mm (1.7 in)	28 of 100 (Routine)
Bumping Lake	United States	Record daily precipitation	53.3 mm (2.1 in)	28 of 100 (Routine)
Katanning Comparison	Australia	Record high maximum temperature	30.6 C (87.1 F)	27 of 100 (Routine)
Colebrook (the Meadows)	Australia	Record daily precipitation	25.9 mm (1.0 in)	27 of 100 (Routine)
Kautokeino	Norway	Record snow depth	33.0 cm (13.0 in)	27 of 100 (Routine)
Timovskoe	Russia	Record high minimum temperature	6.3 C (43.3 F)	27 of 100 (Routine)
Harnosand	Sweden	Record daily precipitation	35.1 mm (1.4 in)	27 of 100 (Routine)
Karesuando	Sweden	Record snow depth	23.0 cm (9.1 in)	27 of 100 (Routine)
Squa Pan Dam	United States	Record daily precipitation	36.1 mm (1.4 in)	27 of 100 (Routine)
Beaver	United States	Record high maximum temperature	30.6 C (87.1 F)	27 of 100 (Routine)

Counts by Type and Timescale

425 records

Records set or tied on 21 October 1966 by type: Highest daily maximum 17, Lowest daily maximum 74, Highest daily minimum 43, Lowest daily minimum 55, Heaviest daily rainfall 194, Heaviest daily snowfall 29, Deepest snow cover 13.

Records on 21 October 1966 by type
Record type	Records
Highest daily maximum	17
Lowest daily maximum	74
Highest daily minimum	43
Lowest daily minimum	55
Heaviest daily rainfall	194
Heaviest daily snowfall	29
Deepest snow cover	13

Records on 21 October 1966 by timescale: all-time 0, monthly 4, daily 421.

How Much Records Were Beaten By

359 broken records

Margins by which the 359 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 214.0. Ties are not counted.

Top 20 by Significance

21 October 1966

Top 20 records on 21 October 1966 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 October 1966	Sandford (Maydena), AU	daily rain	37.8 mm (1.5 in)	24.3 mm (1.0 in)	68 years	63 of 100 (Major)
21 October 1966	Jacobina, BR	monthly rain	93.0 mm (3.7 in)	28.4 mm (1.1 in)	44 years	62 of 100 (Major)
21 October 1966	Longmire Rainier Nps, US	daily snowfall	15.2 cm (6.0 in)	15.2 cm (6.0 in)	53 years	55 of 100 (Notable)
21 October 1966	Bellerive (Fort Street), AU	daily rain	28.4 mm (1.1 in)	19.5 mm (0.8 in)	31 years	53 of 100 (Notable)
21 October 1966	Lencois, BR	daily rain	76.8 mm (3.0 in)	56.2 mm (2.2 in)	20 years	51 of 100 (Notable)
21 October 1966	Risdon, AU	daily rain	43.4 mm (1.7 in)	26.1 mm (1.0 in)	17 years	49 of 100 (Notable)
21 October 1966	Fran?A, BR	daily rain	38.6 mm (1.5 in)	35.0 mm (1.4 in)	16 years	48 of 100 (Notable)
21 October 1966	Hobart Botanical Gardens, AU	daily rain	32.8 mm (1.3 in)	20.1 mm (0.8 in)	17 years	46 of 100 (Notable)
21 October 1966	Cordova AP, US	daily snowfall	23.9 cm (9.4 in)	21.4 cm (8.4 in)	48 years	46 of 100 (Notable)
21 October 1966	Sidsjo, SE	daily rain	28.0 mm (1.1 in)	24.1 mm (0.9 in)	23 years	45 of 100 (Notable)
21 October 1966	Seward AP, US	daily snowfall	12.7 cm (5.0 in)	12.7 cm (5.0 in)	51 years	45 of 100 (Notable)
21 October 1966	Wattle Hill, AU	daily rain	61.2 mm (2.4 in)	50.8 mm (2.0 in)	4 years	44 of 100 (Notable)
21 October 1966	Kenai AP, US	daily snowfall	7.6 cm (3.0 in)	7.6 cm (3.0 in)	66 years	44 of 100 (Notable)
21 October 1966	Manantoddy, IN	daily rain	75.2 mm (3.0 in)	29.2 mm (1.1 in)	48 years	42 of 100 (Notable)
21 October 1966	Buckland (Brockley), AU	daily rain	46.0 mm (1.8 in)	26.9 mm (1.1 in)	4 years	41 of 100 (Notable)
21 October 1966	Putten (Gld), NL	daily rain	27.5 mm (1.1 in)	10.5 mm (0.4 in)	41 years	41 of 100 (Notable)
21 October 1966	Longmire Rainier Nps, US	daily snow depth	12.7 cm (5.0 in)	12.7 cm (5.0 in)	56 years	41 of 100 (Notable)
21 October 1966	Marulan (Arthursleigh), AU	daily rain	30.0 mm (1.2 in)	22.1 mm (0.9 in)	31 years	39 of 100 (Notable)
21 October 1966	Eaglehawk Neck (Jetty Road), AU	daily rain	40.1 mm (1.6 in)	17.7 mm (0.7 in)	48 years	39 of 100 (Notable)
21 October 1966	Snoqualmie Pass, US	daily snowfall	25.4 cm (10.0 in)	20.3 cm (8.0 in)	23 years	39 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

1795 to 1966

Records set or tied on this calendar date in each year from 1795 to 1966. 1966 had 425 records.

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

Records on 10-21 in each year
Year	Records
1795	1
1802	2
1805	1
1808	1
1810	1
1834	1
1835	1
1840	1
1845	1
1847	1
1850	1
1851	2
1854	1
1859	1
1863	1
1864	1
1866	3
1867	1
1868	3
1869	2
1871	1
1872	1
1873	1
1874	1
1876	4
1877	2
1878	1
1880	3
1881	1
1883	1
1886	1
1888	2
1889	2
1890	3
1891	6
1892	6
1893	1
1894	1
1895	2
1896	5
1898	6
1899	3
1900	2
1901	9
1902	2
1903	3
1904	30
1905	15
1906	11
1907	35
1908	35
1909	19
1910	21
1911	10
1912	18
1913	59
1914	35
1915	43
1916	70
1917	208
1918	18
1919	102
1920	149
1921	58
1922	78
1923	81
1924	389
1925	150
1926	77
1927	187
1928	78
1929	200
1930	492
1931	217
1932	165
1933	733
1934	407
1935	707
1936	407
1937	132
1938	121
1939	491
1940	537
1941	644
1942	258
1943	421
1944	367
1945	538
1946	297
1947	977
1948	266
1949	1,015
1950	438
1951	382
1952	848
1953	1,579
1954	279
1955	481
1956	276
1957	511
1958	322
1959	410
1960	408
1961	553
1962	359
1963	725
1964	457
1965	465
1966	425
1967	472
1968	174
1969	881
1970	548
1971	498
1972	813
1973	464
1974	866
1975	509
1976	1,467
1977	451
1978	616
1979	1,958
1980	378
1981	667
1982	870
1983	786
1984	1,872
1985	776
1986	814
1987	852
1988	696
1989	1,668
1990	807
1991	877
1992	1,095
1993	845
1994	670
1995	1,120
1996	1,581
1997	915
1998	711
1999	688
2000	771
2001	610
2002	1,241
2003	2,066
2004	1,674
2005	949
2006	1,057
2007	916
2008	610
2009	713
2010	710
2011	662
2012	703
2013	440
2014	716
2015	493
2016	734
2017	750
2018	440
2019	757
2020	1,135
2021	574
2022	629
2023	890
2024	1,138
2025	364

Download the Data

Data for records on 1966-10-21: 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Margin	Records
0 to 50	343
50 to 100	9
100 to 150	3
150 to 200	2
200 to 250	2