Weather Records on 11 September 1986

1,221 weather records were set or tied worldwide on 11 September 1986. Highest significance: Alma, US.

Key Facts for 11 September 1986

On 11 September 1986, 1,221 weather records were set or tied at long-record stations worldwide.
269 were record highs and 467 were record lows, counting maximum and minimum temperature.
By timescale, 19 were all-time records, 44 monthly and 1,158 daily.
Alma set an all-time record daily precipitation of 237.0 mm (9.3 in) on 11 September 1986.
Across 164 earlier years (1809 to 2026) the same calendar date averaged 419 records.

Record Map

1,221 stations

1,221 station records on 11 September 1986 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 11 September 1986: highest significance records shown on the map
Station	Country	Type	Value	Significance
Alma	United States	Record daily precipitation	237.0 mm (9.3 in)	97 of 100 (Exceptional)
Sandusky	United States	Record daily precipitation	196.9 mm (7.8 in)	88 of 100 (Exceptional)
Bad Axe	United States	Record daily precipitation	164.1 mm (6.5 in)	81 of 100 (Exceptional)
Saginaw #3	United States	Record daily precipitation	216.9 mm (8.5 in)	79 of 100 (Major)
Central Michigan UNIV	United States	Record daily precipitation	237.5 mm (9.4 in)	77 of 100 (Major)
Millington 3 SE	United States	Record daily precipitation	217.4 mm (8.6 in)	72 of 100 (Major)
Cape Leeuwin	Australia	Record daily precipitation	39.0 mm (1.5 in)	69 of 100 (Major)
Big Rapids Wtp	United States	Record daily precipitation	194.1 mm (7.6 in)	69 of 100 (Major)
Antioch	United States	Record daily precipitation	89.9 mm (3.5 in)	68 of 100 (Major)
Oshkosh	United States	Record daily precipitation	116.3 mm (4.6 in)	68 of 100 (Major)
Plymouth Wwtp	United States	Record daily precipitation	155.4 mm (6.1 in)	68 of 100 (Major)
Kent City 2 SW	United States	Record daily precipitation	204.0 mm (8.0 in)	66 of 100 (Major)
Saginaw Consumers Pwr	United States	Record daily precipitation	200.7 mm (7.9 in)	66 of 100 (Major)
Chilton	United States	Record daily precipitation	134.9 mm (5.3 in)	66 of 100 (Major)
Port Washington	United States	Record daily precipitation	73.9 mm (2.9 in)	66 of 100 (Major)
Saginaw Mbs Intl AP	United States	Record daily precipitation	115.6 mm (4.6 in)	66 of 100 (Major)
Caro Wwtp	United States	Record daily precipitation	184.9 mm (7.3 in)	65 of 100 (Major)
Lamar 7N	United States	Record daily precipitation	121.9 mm (4.8 in)	65 of 100 (Major)
Sebewaing	United States	Record daily precipitation	172.7 mm (6.8 in)	64 of 100 (Major)
Evart	United States	Record daily precipitation	162.6 mm (6.4 in)	62 of 100 (Major)
Hart 3 WSW	United States	Record daily precipitation	137.9 mm (5.4 in)	62 of 100 (Major)
Standish 4NE	United States	Record daily precipitation	95.3 mm (3.8 in)	61 of 100 (Major)
Winona Dam 5 A	United States	Record daily precipitation	57.2 mm (2.3 in)	58 of 100 (Notable)
Montague 4 NW	United States	Record daily precipitation	140.7 mm (5.5 in)	57 of 100 (Notable)
Amelup	Australia	Record daily precipitation	29.0 mm (1.1 in)	56 of 100 (Notable)
King River	Australia	Record daily precipitation	49.8 mm (2.0 in)	55 of 100 (Notable)
Chifeng	China	Record daily precipitation	65.6 mm (2.6 in)	53 of 100 (Notable)
Yale 1 NNW	United States	Record daily precipitation	109.7 mm (4.3 in)	53 of 100 (Notable)
Faribault	United States	Record daily precipitation	110.7 mm (4.4 in)	53 of 100 (Notable)
Sheboygan	United States	Record daily precipitation	131.8 mm (5.2 in)	53 of 100 (Notable)
Riverdale	Australia	Record daily precipitation	52.0 mm (2.0 in)	52 of 100 (Notable)
Ludington 4 SE	United States	Record daily precipitation	74.9 mm (2.9 in)	52 of 100 (Notable)
Dalton	United States	Record daily precipitation	68.1 mm (2.7 in)	52 of 100 (Notable)
Westbourne	Australia	Record daily precipitation	34.4 mm (1.4 in)	51 of 100 (Notable)
Woogenellup	Australia	Record daily precipitation	35.8 mm (1.4 in)	51 of 100 (Notable)
Chumphon	Thailand	Record daily precipitation	96.0 mm (3.8 in)	50 of 100 (Notable)
Frankfort 2NE	United States	Record daily precipitation	75.2 mm (3.0 in)	50 of 100 (Notable)
Trempealeau Dam 6	United States	Record daily precipitation	65.5 mm (2.6 in)	50 of 100 (Notable)
West Bend	United States	Record daily precipitation	69.9 mm (2.8 in)	50 of 100 (Notable)
Greenville 2 NNE	United States	Record daily precipitation	122.4 mm (4.8 in)	49 of 100 (Notable)
Elgin 2SSW	United States	Record daily precipitation	55.4 mm (2.2 in)	49 of 100 (Notable)
Dodge	United States	Record daily precipitation	62.7 mm (2.5 in)	49 of 100 (Notable)
Bremen-Seefahrtschule	Germany	Record low minimum temperature	-0.2 C (31.6 F)	48 of 100 (Notable)
Galesville 2WSW	United States	Record daily precipitation	56.6 mm (2.2 in)	48 of 100 (Notable)
Mauston 1 SE	United States	Record daily precipitation	97.3 mm (3.8 in)	48 of 100 (Notable)
Mt Mary College	United States	Record daily precipitation	59.9 mm (2.4 in)	48 of 100 (Notable)
Grand Haven Fire Dept	United States	Record daily precipitation	68.3 mm (2.7 in)	47 of 100 (Notable)
Chillicothe 2S	United States	Record daily precipitation	102.1 mm (4.0 in)	47 of 100 (Notable)
Manitowoc	United States	Record daily precipitation	86.4 mm (3.4 in)	47 of 100 (Notable)
Holbrook	United States	Record low minimum temperature	1.7 C (35.1 F)	46 of 100 (Notable)
Emmett	United States	Record daily precipitation	97.8 mm (3.9 in)	46 of 100 (Notable)
Holton	United States	Record daily precipitation	114.3 mm (4.5 in)	46 of 100 (Notable)
Mc Cune 6 SW	United States	Record daily precipitation	102.1 mm (4.0 in)	46 of 100 (Notable)
Lapeer Wwtp	United States	Record daily precipitation	86.9 mm (3.4 in)	46 of 100 (Notable)
Wabasha	United States	Record daily precipitation	66.0 mm (2.6 in)	46 of 100 (Notable)
Redmond	Australia	Record daily precipitation	43.4 mm (1.7 in)	45 of 100 (Notable)
Adak AP	United States	Record daily precipitation	50.8 mm (2.0 in)	45 of 100 (Notable)
Waukon 3NNE	United States	Record daily precipitation	81.5 mm (3.2 in)	44 of 100 (Notable)
La Crescent Dam 7	United States	Record daily precipitation	63.5 mm (2.5 in)	44 of 100 (Notable)
Wetumka 3 NE	United States	Record daily precipitation	71.1 mm (2.8 in)	44 of 100 (Notable)

Counts by Type and Timescale

1,221 records

Records set or tied on 11 September 1986 by type: Highest daily maximum 83, Lowest daily maximum 136, Highest daily minimum 186, Lowest daily minimum 331, Heaviest daily rainfall 483, Heaviest daily snowfall 1, Deepest snow cover 1.

Records on 11 September 1986 by type
Record type	Records
Highest daily maximum	83
Lowest daily maximum	136
Highest daily minimum	186
Lowest daily minimum	331
Heaviest daily rainfall	483
Heaviest daily snowfall	1
Deepest snow cover	1

Records on 11 September 1986 by timescale: all-time 19, monthly 44, daily 1,158.

How Much Records Were Beaten By

1,032 broken records

Margins by which the 1,032 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 129.5. Ties are not counted.

Top 20 by Significance

11 September 1986

Top 20 records on 11 September 1986 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
11 September 1986	Alma, US	all-time rain	237.0 mm (9.3 in)	97.3 mm (3.8 in)	92 years	97 of 100 (Exceptional)
11 September 1986	Sandusky, US	all-time rain	196.9 mm (7.8 in)	90.2 mm (3.6 in)	73 years	88 of 100 (Exceptional)
11 September 1986	Bad Axe, US	all-time rain	164.1 mm (6.5 in)	75.2 mm (3.0 in)	51 years	81 of 100 (Exceptional)
11 September 1986	Saginaw #3, US	all-time rain	216.9 mm (8.5 in)	116.3 mm (4.6 in)	41 years	79 of 100 (Major)
11 September 1986	Central Michigan UNIV, US	all-time rain	237.5 mm (9.4 in)	129.5 mm (5.1 in)	29 years	77 of 100 (Major)
11 September 1986	Millington 3 SE, US	all-time rain	217.4 mm (8.6 in)	113.3 mm (4.5 in)	10 years	72 of 100 (Major)
11 September 1986	Cape Leeuwin, AU	daily rain	39.0 mm (1.5 in)	23.3 mm (0.9 in)	76 years	69 of 100 (Major)
11 September 1986	Big Rapids Wtp, US	all-time rain	194.1 mm (7.6 in)	55.9 mm (2.2 in)	0 years	69 of 100 (Major)
11 September 1986	Antioch, US	daily rain	89.9 mm (3.5 in)	62.7 mm (2.5 in)	68 years	68 of 100 (Major)
11 September 1986	Oshkosh, US	monthly rain	116.3 mm (4.6 in)	43.7 mm (1.7 in)	35 years	68 of 100 (Major)
11 September 1986	Plymouth Wwtp, US	all-time rain	155.4 mm (6.1 in)	29.4 mm (1.2 in)	62 years	68 of 100 (Major)
11 September 1986	Kent City 2 SW, US	all-time rain	204.0 mm (8.0 in)	38.9 mm (1.5 in)	28 years	66 of 100 (Major)
11 September 1986	Saginaw Consumers Pwr, US	all-time rain	200.7 mm (7.9 in)	109.3 mm (4.3 in)	10 years	66 of 100 (Major)
11 September 1986	Chilton, US	all-time rain	134.9 mm (5.3 in)	37.1 mm (1.5 in)	8 years	66 of 100 (Major)
11 September 1986	Port Washington, US	daily rain	73.9 mm (2.9 in)	47.5 mm (1.9 in)	68 years	66 of 100 (Major)
11 September 1986	Saginaw Mbs Intl AP, US	daily rain	115.6 mm (4.6 in)	83.8 mm (3.3 in)	60 years	66 of 100 (Major)
11 September 1986	Caro Wwtp, US	all-time rain	184.9 mm (7.3 in)	81.3 mm (3.2 in)	0 years	65 of 100 (Major)
11 September 1986	Lamar 7N, US	daily rain	121.9 mm (4.8 in)	58.4 mm (2.3 in)	87 years	65 of 100 (Major)
11 September 1986	Sebewaing, US	all-time rain	172.7 mm (6.8 in)	85.3 mm (3.4 in)	2 years	64 of 100 (Major)
11 September 1986	Evart, US	all-time rain	162.6 mm (6.4 in)	29.2 mm (1.1 in)	30 years	62 of 100 (Major)

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

1809 to 1986

Records set or tied on this calendar date in each year from 1809 to 1986. 1986 had 1,221 records.

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

Records on 09-11 in each year
Year	Records
1809	1
1814	3
1818	1
1830	1
1836	1
1838	3
1839	1
1848	1
1850	1
1851	1
1854	2
1858	1
1860	2
1861	1
1863	2
1865	3
1866	1
1874	2
1876	1
1877	1
1879	1
1880	1
1882	4
1883	2
1884	1
1886	1
1888	2
1889	4
1890	2
1891	2
1892	1
1893	4
1894	2
1895	4
1896	1
1897	3
1898	3
1899	5
1900	1
1901	3
1902	15
1903	13
1904	4
1905	5
1906	10
1907	9
1908	20
1909	12
1910	19
1911	9
1912	25
1913	22
1914	52
1915	160
1916	17
1917	88
1918	62
1919	52
1920	158
1921	52
1922	78
1923	44
1924	290
1925	260
1926	137
1927	300
1928	127
1929	206
1930	136
1931	868
1932	210
1933	276
1934	144
1935	410
1936	567
1937	324
1938	288
1939	561
1940	891
1941	210
1942	234
1943	335
1944	446
1945	341
1946	262
1947	611
1948	424
1949	450
1950	462
1951	247
1952	549
1953	392
1954	363
1955	479
1956	539
1957	470
1958	748
1959	488
1960	423
1961	524
1962	480
1963	359
1964	1,195
1965	414
1966	392
1967	478
1968	835
1969	685
1970	474
1971	464
1972	507
1973	612
1974	430
1975	644
1976	920
1977	406
1978	911
1979	596
1980	474
1981	347
1982	862
1983	1,243
1984	888
1985	844
1986	1,221
1987	595
1988	1,019
1989	1,301
1990	840
1991	843
1992	672
1993	809
1994	713
1995	619
1996	1,030
1997	808
1998	1,821
1999	1,073
2000	1,469
2001	826
2002	1,059
2003	1,022
2004	740
2005	1,163
2006	1,132
2007	947
2008	916
2009	774
2010	965
2011	1,051
2012	687
2013	1,207
2014	1,100
2015	683
2016	677
2017	916
2018	763
2019	806
2020	1,235
2021	851
2022	617
2023	1,034
2024	889
2025	917
2026	615

Download the Data

Data for records on 1986-09-11: 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	921
20 to 40	70
40 to 60	27
60 to 80	4
80 to 100	6
100 to 120	3
120 to 140	1