Weather Records on 12 October 1984

636 weather records were set or tied worldwide on 12 October 1984. Highest significance: Cottonwood Weir, US.

Key Facts for 12 October 1984

On 12 October 1984, 636 weather records were set or tied at long-record stations worldwide.
323 were record highs and 95 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 17 monthly and 619 daily.
Cottonwood Weir set a daily record precipitation of 48.5 mm (1.9 in) on 12 October 1984.
Across 163 earlier years (1805 to 2026) the same calendar date averaged 451 records.

Record Map

636 stations

636 station records on 12 October 1984 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 12 October 1984: highest significance records shown on the map
Station	Country	Type	Value	Significance
Cottonwood Weir	United States	Record daily precipitation	48.5 mm (1.9 in)	62 of 100 (Major)
Tooele	United States	Record daily precipitation	36.1 mm (1.4 in)	59 of 100 (Notable)
Richmond	United States	Record daily precipitation	29.0 mm (1.1 in)	48 of 100 (Notable)
Jefferson	United States	Record daily precipitation	52.1 mm (2.1 in)	46 of 100 (Notable)
Vermelho Velho	Brazil	Record daily precipitation	72.3 mm (2.8 in)	43 of 100 (Notable)
Oak City	United States	Record daily precipitation	28.4 mm (1.1 in)	43 of 100 (Notable)
Scipio	United States	Record daily precipitation	25.4 mm (1.0 in)	43 of 100 (Notable)
Longview	United States	Record daily precipitation	113.8 mm (4.5 in)	42 of 100 (Notable)
Malvern	United States	Record daily precipitation	78.7 mm (3.1 in)	40 of 100 (Notable)
Wray	United States	Record high minimum temperature	13.3 C (55.9 F)	40 of 100 (Notable)
Virginia City	United States	Record daily snowfall	10.2 cm (4.0 in)	40 of 100 (Notable)
Spanish Fk Pwr House	United States	Record daily precipitation	26.4 mm (1.0 in)	40 of 100 (Notable)
Izmail	Ukraine	Record high maximum temperature	25.4 C (77.7 F)	39 of 100 (Notable)
Waycross 4 NE	United States	Record low minimum temperature	1.7 C (35.1 F)	39 of 100 (Notable)
Mtn Dell Dam	United States	Record daily precipitation	41.4 mm (1.6 in)	39 of 100 (Notable)
Payson	United States	Record daily precipitation	31.8 mm (1.3 in)	38 of 100 (Notable)
Chichibu	Japan	Record daily precipitation	82.0 mm (3.2 in)	37 of 100 (Notable)
Deer Creek Dam	United States	Record daily precipitation	31.2 mm (1.2 in)	37 of 100 (Notable)
Miyakejima	Japan	Record daily precipitation	167.5 mm (6.6 in)	36 of 100 (Notable)
Belle Plaine	United States	Record high minimum temperature	15.6 C (60.1 F)	36 of 100 (Notable)
Gull Lake Dam	United States	Record high minimum temperature	15.0 C (59.0 F)	36 of 100 (Notable)
Sisseton	United States	Record high minimum temperature	20.0 C (68.0 F)	36 of 100 (Notable)
Garfield	United States	Record daily precipitation	30.5 mm (1.2 in)	36 of 100 (Notable)
Grafton	United States	Record high maximum temperature	25.0 C (77.0 F)	35 of 100 (Notable)
Brazzaville	Congo (Brazzaville)	Record daily precipitation	95.0 mm (3.7 in)	34 of 100 (Routine)
Manassa	United States	Record high minimum temperature	7.8 C (46.0 F)	34 of 100 (Routine)
Winton Pwr Plt	United States	Record high minimum temperature	11.7 C (53.1 F)	34 of 100 (Routine)
Halsey 2 W	United States	Record high minimum temperature	13.3 C (55.9 F)	34 of 100 (Routine)
Ft Yates 4 SW	United States	Record high minimum temperature	15.6 C (60.1 F)	34 of 100 (Routine)
Intl Falls Intl AP	United States	Record high minimum temperature	13.9 C (57.0 F)	34 of 100 (Routine)
Ust Tzilma	Russia	Record low minimum temperature	-17.4 C (0.7 F)	33 of 100 (Routine)
Sabinal	United States	Record daily precipitation	37.8 mm (1.5 in)	33 of 100 (Routine)
UNIV of Utah	United States	Record daily precipitation	31.0 mm (1.2 in)	33 of 100 (Routine)
Hosston	United States	Record daily precipitation	74.2 mm (2.9 in)	32 of 100 (Routine)
Park River	United States	Record high minimum temperature	15.0 C (59.0 F)	32 of 100 (Routine)
Wishek	United States	Record high minimum temperature	13.9 C (57.0 F)	32 of 100 (Routine)
Eureka	United States	Record high minimum temperature	12.8 C (55.0 F)	32 of 100 (Routine)
Forestburg 4 NNE	United States	Record high minimum temperature	14.4 C (57.9 F)	32 of 100 (Routine)
Leola	United States	Record high maximum temperature	26.7 C (80.1 F)	32 of 100 (Routine)
Wilbur	United States	Record low maximum temperature	8.9 C (48.0 F)	32 of 100 (Routine)
Emblem	United States	Record high minimum temperature	10.0 C (50.0 F)	32 of 100 (Routine)
Worland	United States	Record high minimum temperature	10.6 C (51.1 F)	32 of 100 (Routine)
Jaguaruna-Jusante (on?A)	Brazil	Record daily precipitation	83.5 mm (3.3 in)	31 of 100 (Routine)
Akron 4 E	United States	Record high minimum temperature	7.2 C (45.0 F)	31 of 100 (Routine)
Kenmare 1 WSW	United States	Record high minimum temperature	13.3 C (55.9 F)	31 of 100 (Routine)
Santaquin Chlorinator	United States	Record daily precipitation	29.0 mm (1.1 in)	31 of 100 (Routine)
Hinckley	United States	Record high minimum temperature	11.7 C (53.1 F)	30 of 100 (Routine)
Luverne	United States	Record high minimum temperature	13.9 C (57.0 F)	30 of 100 (Routine)
Sidney	United States	Record high minimum temperature	10.0 C (50.0 F)	30 of 100 (Routine)
Dunn Ctr 1E	United States	Record high minimum temperature	12.8 C (55.0 F)	30 of 100 (Routine)
Towner 2 NE	United States	Record high minimum temperature	12.8 C (55.0 F)	30 of 100 (Routine)
Willow City	United States	Record high minimum temperature	10.6 C (51.1 F)	30 of 100 (Routine)
Maatsuyker Island Lighthouse	Australia	Record daily precipitation	30.0 mm (1.2 in)	29 of 100 (Routine)
Nikko	Japan	Record daily precipitation	72.0 mm (2.8 in)	29 of 100 (Routine)
Orleans	United States	Record low maximum temperature	12.8 C (55.0 F)	29 of 100 (Routine)
Collegeville St John's	United States	Record high minimum temperature	15.6 C (60.1 F)	29 of 100 (Routine)
Roundup	United States	Record high minimum temperature	11.1 C (52.0 F)	29 of 100 (Routine)
Crossroads 2	United States	Record daily precipitation	38.1 mm (1.5 in)	29 of 100 (Routine)
Mauston 1 SE	United States	Record high minimum temperature	12.8 C (55.0 F)	29 of 100 (Routine)
Bom Jesus Do Galho	Brazil	Record daily precipitation	50.6 mm (2.0 in)	28 of 100 (Routine)

Counts by Type and Timescale

636 records

Records set or tied on 12 October 1984 by type: Highest daily maximum 46, Lowest daily maximum 62, Highest daily minimum 277, Lowest daily minimum 33, Heaviest daily rainfall 212, Heaviest daily snowfall 6.

Records on 12 October 1984 by type
Record type	Records
Highest daily maximum	46
Lowest daily maximum	62
Highest daily minimum	277
Lowest daily minimum	33
Heaviest daily rainfall	212
Heaviest daily snowfall	6
Deepest snow cover	0

Records on 12 October 1984 by timescale: all-time 0, monthly 17, daily 619.

How Much Records Were Beaten By

508 broken records

Margins by which the 508 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 106.5. Ties are not counted.

Top 20 by Significance

12 October 1984

Top 20 records on 12 October 1984 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
12 October 1984	Cottonwood Weir, US	daily rain	48.5 mm (1.9 in)	36.6 mm (1.4 in)	56 years	62 of 100 (Major)
12 October 1984	Tooele, US	daily rain	36.1 mm (1.4 in)	22.9 mm (0.9 in)	80 years	59 of 100 (Notable)
12 October 1984	Richmond, US	daily rain	29.0 mm (1.1 in)	17.1 mm (0.7 in)	64 years	48 of 100 (Notable)
12 October 1984	Jefferson, US	daily rain	52.1 mm (2.1 in)	36.9 mm (1.5 in)	66 years	46 of 100 (Notable)
12 October 1984	Vermelho Velho, BR	daily rain	72.3 mm (2.8 in)	50.1 mm (2.0 in)	2 years	43 of 100 (Notable)
12 October 1984	Oak City, US	daily rain	28.4 mm (1.1 in)	18.2 mm (0.7 in)	39 years	43 of 100 (Notable)
12 October 1984	Scipio, US	daily rain	25.4 mm (1.0 in)	10.2 mm (0.4 in)	64 years	43 of 100 (Notable)
12 October 1984	Longview, US	daily rain	113.8 mm (4.5 in)	58.9 mm (2.3 in)	11 years	42 of 100 (Notable)
12 October 1984	Malvern, US	daily rain	78.7 mm (3.1 in)	50.3 mm (2.0 in)	1 year	40 of 100 (Notable)
12 October 1984	Wray, US	daily high min	13.3 C (55.9 F)	2.7 C (4.9 F)	89 years	40 of 100 (Notable)
12 October 1984	Virginia City, US	daily snowfall	10.2 cm (4.0 in)	2.6 cm (1.0 in)	86 years	40 of 100 (Notable)
12 October 1984	Spanish Fk Pwr House, US	daily rain	26.4 mm (1.0 in)	13.7 mm (0.5 in)	56 years	40 of 100 (Notable)
12 October 1984	Izmail, UA	daily high max	25.4 C (77.7 F)	1.2 C (2.2 F)	94 years	39 of 100 (Notable)
12 October 1984	Waycross 4 NE, US	daily low min	1.7 C (35.1 F)	3.9 C (7.0 F)	78 years	39 of 100 (Notable)
12 October 1984	Mtn Dell Dam, US	daily rain	41.4 mm (1.6 in)	23.1 mm (0.9 in)	18 years	39 of 100 (Notable)
12 October 1984	Payson, US	daily rain	31.8 mm (1.3 in)	20.4 mm (0.8 in)	27 years	38 of 100 (Notable)
12 October 1984	Chichibu, JP	daily rain	82.0 mm (3.2 in)	59.6 mm (2.3 in)	18 years	37 of 100 (Notable)
12 October 1984	Deer Creek Dam, US	daily rain	31.2 mm (1.2 in)	20.3 mm (0.8 in)	39 years	37 of 100 (Notable)
12 October 1984	Miyakejima, JP	daily rain	167.5 mm (6.6 in)	106.5 mm (4.2 in)	13 years	36 of 100 (Notable)
12 October 1984	Belle Plaine, US	daily high min	15.6 C (60.1 F)	1.2 C (2.2 F)	84 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

1805 to 1984

Records set or tied on this calendar date in each year from 1805 to 1984. 1984 had 636 records.

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

Records on 10-12 in each year
Year	Records
1805	2
1809	1
1810	1
1814	3
1822	1
1839	1
1841	1
1843	1
1850	1
1852	1
1854	1
1859	1
1860	2
1861	1
1867	1
1871	3
1873	2
1875	2
1876	5
1879	2
1881	2
1884	1
1885	2
1886	1
1887	2
1888	1
1889	1
1890	3
1891	1
1892	1
1893	2
1894	2
1895	2
1896	3
1897	3
1898	2
1899	3
1900	2
1901	6
1902	14
1903	16
1904	30
1905	13
1906	16
1907	10
1908	13
1909	30
1910	13
1911	10
1912	30
1913	33
1914	17
1915	34
1916	29
1917	53
1918	29
1919	53
1920	79
1921	102
1922	21
1923	200
1924	129
1925	107
1926	201
1927	195
1928	714
1929	165
1930	606
1931	283
1932	398
1933	155
1934	477
1935	209
1936	301
1937	185
1938	470
1939	198
1940	235
1941	226
1942	540
1943	418
1944	274
1945	321
1946	554
1947	358
1948	311
1949	725
1950	594
1951	391
1952	352
1953	252
1954	911
1955	383
1956	899
1957	473
1958	448
1959	501
1960	449
1961	436
1962	971
1963	459
1964	636
1965	157
1966	423
1967	623
1968	443
1969	1,828
1970	763
1971	382
1972	412
1973	673
1974	369
1975	830
1976	582
1977	832
1978	525
1979	898
1980	741
1981	1,201
1982	777
1983	992
1984	636
1985	872
1986	1,510
1987	1,530
1988	1,015
1989	543
1990	1,325
1991	948
1992	865
1993	1,145
1994	934
1995	1,238
1996	816
1997	1,851
1998	741
1999	641
2000	1,095
2001	1,194
2002	1,139
2003	1,043
2004	750
2005	872
2006	1,357
2007	566
2008	1,669
2009	2,300
2010	797
2011	906
2012	921
2013	558
2014	514
2015	964
2016	374
2017	1,068
2018	1,195
2019	1,321
2020	655
2021	1,294
2022	439
2023	904
2024	958
2025	624
2026	768

Download the Data

Data for records on 1984-10-12: 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	481
20 to 40	16
40 to 60	9
60 to 80	0
80 to 100	1
100 to 120	1