Weather Records on 20 September 1986

743 weather records were set or tied worldwide on 20 September 1986. Highest significance: Mackinaw 3WSW, US.

Key Facts for 20 September 1986

On 20 September 1986, 743 weather records were set or tied at long-record stations worldwide.
151 were record highs and 328 were record lows, counting maximum and minimum temperature.
By timescale, 3 were all-time records, 25 monthly and 715 daily.
Mackinaw 3WSW set an all-time record daily precipitation of 152.4 mm (6.0 in) on 20 September 1986.
Across 156 earlier years (1812 to 2026) the same calendar date averaged 440 records.

Record Map

743 stations

743 station records on 20 September 1986 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 September 1986: highest significance records shown on the map
Station	Country	Type	Value	Significance
Mackinaw 3WSW	United States	Record daily precipitation	152.4 mm (6.0 in)	65 of 100 (Major)
Springfield Abraham Lincoln Ca	United States	Record daily precipitation	107.4 mm (4.2 in)	60 of 100 (Major)
Minonk	United States	Record daily precipitation	97.8 mm (3.9 in)	59 of 100 (Notable)
Iliamna AP	United States	Record daily precipitation	54.9 mm (2.2 in)	59 of 100 (Notable)
Dillingham FAA AP	United States	Record daily precipitation	86.1 mm (3.4 in)	58 of 100 (Notable)
Petersburg 3SSW	United States	Record daily precipitation	120.7 mm (4.8 in)	55 of 100 (Notable)
Ufa	Russia	Record daily precipitation	35.4 mm (1.4 in)	53 of 100 (Notable)
Canton L&D 20	United States	Record daily precipitation	166.9 mm (6.6 in)	52 of 100 (Notable)
Luiz Alves	Brazil	Record daily precipitation	80.0 mm (3.1 in)	51 of 100 (Notable)
Bloomington Wtr Wks	United States	Record daily precipitation	180.8 mm (7.1 in)	50 of 100 (Notable)
Hirado	Japan	Record daily precipitation	171.0 mm (6.7 in)	49 of 100 (Notable)
Jasper	United States	Record daily precipitation	71.9 mm (2.8 in)	49 of 100 (Notable)
Labelle	United States	Record daily precipitation	97.8 mm (3.9 in)	49 of 100 (Notable)
Mt Pulaski	United States	Record daily precipitation	71.1 mm (2.8 in)	48 of 100 (Notable)
Mason City	United States	Record daily precipitation	46.0 mm (1.8 in)	48 of 100 (Notable)
Wahpeton 3 N	United States	Record daily precipitation	31.0 mm (1.2 in)	47 of 100 (Notable)
Decatur Wtp	United States	Record daily precipitation	67.3 mm (2.6 in)	46 of 100 (Notable)
Hitoyoshi	Japan	Record daily precipitation	116.0 mm (4.6 in)	44 of 100 (Notable)
Duvan	Russia	Record daily precipitation	27.1 mm (1.1 in)	44 of 100 (Notable)
Crater Lake Nps HQ	United States	Record snow depth	38.1 cm (15.0 in)	44 of 100 (Notable)
Higuera Blanca	Mexico	Record daily precipitation	126.0 mm (5.0 in)	43 of 100 (Notable)
Golden	United States	Record daily precipitation	45.0 mm (1.8 in)	43 of 100 (Notable)
Aksakovo	Russia	Record daily precipitation	27.6 mm (1.1 in)	42 of 100 (Notable)
Memphis	United States	Record daily precipitation	151.6 mm (6.0 in)	42 of 100 (Notable)
Cambridge	United States	Record low maximum temperature	11.1 C (52.0 F)	41 of 100 (Notable)
Lincoln	United States	Record daily precipitation	90.2 mm (3.6 in)	41 of 100 (Notable)
Bakhmaro	Georgia	Record daily precipitation	56.7 mm (2.2 in)	40 of 100 (Notable)
Biskra	Algeria	Record high maximum temperature	38.4 C (101.1 F)	39 of 100 (Notable)
Palmerville	Australia	Record high minimum temperature	22.2 C (72.0 F)	39 of 100 (Notable)
San Rafael-Civic Ctr	United States	Record low maximum temperature	18.3 C (64.9 F)	39 of 100 (Notable)
Quincy Mem Brg	United States	Record daily precipitation	81.3 mm (3.2 in)	39 of 100 (Notable)
White Hall 1 E	United States	Record daily precipitation	50.8 mm (2.0 in)	39 of 100 (Notable)
Benson	United States	Record daily precipitation	41.1 mm (1.6 in)	39 of 100 (Notable)
Quincy	United States	Record low maximum temperature	11.1 C (52.0 F)	38 of 100 (Notable)
Garden Valley	United States	Record low maximum temperature	11.1 C (52.0 F)	38 of 100 (Notable)
Lake Yellowstone	United States	Record daily precipitation	29.2 mm (1.1 in)	38 of 100 (Notable)
Kulani Camp 79	United States	Record daily precipitation	50.8 mm (2.0 in)	38 of 100 (Notable)
San Jose de Raices	Mexico	Record daily precipitation	29.0 mm (1.1 in)	37 of 100 (Notable)
Zamboanga	Philippines	Record daily precipitation	61.0 mm (2.4 in)	37 of 100 (Notable)
Weaverville	United States	Record low maximum temperature	11.1 C (52.0 F)	37 of 100 (Notable)
Payette	United States	Record low maximum temperature	15.0 C (59.0 F)	37 of 100 (Notable)
W Lafayette 6 NW	United States	Record daily precipitation	62.7 mm (2.5 in)	37 of 100 (Notable)
Vale	United States	Record low maximum temperature	13.3 C (55.9 F)	37 of 100 (Notable)
Susanville 2SW	United States	Record low maximum temperature	10.6 C (51.1 F)	36 of 100 (Notable)
Monticello	United States	Record daily precipitation	50.8 mm (2.0 in)	36 of 100 (Notable)
Sasebo Reg Met HQ	Japan	Record daily precipitation	97.0 mm (3.8 in)	35 of 100 (Notable)
Irapuato	Mexico	Record daily precipitation	40.9 mm (1.6 in)	35 of 100 (Notable)
Glendora Fc 287B	United States	Record daily precipitation	66.8 mm (2.6 in)	35 of 100 (Notable)
Russell Springs	United States	Record high minimum temperature	19.4 C (66.9 F)	35 of 100 (Notable)
Plattsburgh AFB	United States	Record low maximum temperature	12.2 C (54.0 F)	35 of 100 (Notable)
Madeline Is	United States	Record daily precipitation	35.6 mm (1.4 in)	35 of 100 (Notable)
Gore	Ethiopia	Record high maximum temperature	27.0 C (80.6 F)	34 of 100 (Routine)
Saga	Japan	Record daily precipitation	90.5 mm (3.6 in)	34 of 100 (Routine)
Mokpo	Korea, South	Record daily precipitation	99.0 mm (3.9 in)	34 of 100 (Routine)
Eagle Mtn	United States	Record low minimum temperature	10.6 C (51.1 F)	34 of 100 (Routine)
Tejon Rancho	United States	Record low maximum temperature	23.3 C (73.9 F)	34 of 100 (Routine)
Peotone	United States	Record daily precipitation	48.5 mm (1.9 in)	34 of 100 (Routine)
Itanhaem	Brazil	Record daily precipitation	77.5 mm (3.1 in)	33 of 100 (Routine)
Bremen-Seefahrtschule	Germany	Record low minimum temperature	1.7 C (35.1 F)	33 of 100 (Routine)
Stuttgart-Stadt	Germany	Record low minimum temperature	1.6 C (34.9 F)	33 of 100 (Routine)

Counts by Type and Timescale

743 records

Records set or tied on 20 September 1986 by type: Highest daily maximum 64, Lowest daily maximum 180, Highest daily minimum 87, Lowest daily minimum 148, Heaviest daily rainfall 262, Heaviest daily snowfall 1, Deepest snow cover 1.

Records on 20 September 1986 by type
Record type	Records
Highest daily maximum	64
Lowest daily maximum	180
Highest daily minimum	87
Lowest daily minimum	148
Heaviest daily rainfall	262
Heaviest daily snowfall	1
Deepest snow cover	1

Records on 20 September 1986 by timescale: all-time 3, monthly 25, daily 715.

How Much Records Were Beaten By

594 broken records

Margins by which the 594 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 356.0. Ties are not counted.

Top 20 by Significance

20 September 1986

Top 20 records on 20 September 1986 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 September 1986	Mackinaw 3WSW, US	all-time rain	152.4 mm (6.0 in)	46.2 mm (1.8 in)	43 years	65 of 100 (Major)
20 September 1986	Springfield Abraham Lincoln Ca, US	daily rain	107.4 mm (4.2 in)	86.6 mm (3.4 in)	41 years	60 of 100 (Major)
20 September 1986	Minonk, US	daily rain	97.8 mm (3.9 in)	63.0 mm (2.5 in)	36 years	59 of 100 (Notable)
20 September 1986	Iliamna AP, US	daily rain	54.9 mm (2.2 in)	37.6 mm (1.5 in)	44 years	59 of 100 (Notable)
20 September 1986	Dillingham FAA AP, US	monthly rain	86.1 mm (3.4 in)	30.5 mm (1.2 in)	9 years	58 of 100 (Notable)
20 September 1986	Petersburg 3SSW, US	monthly rain	120.7 mm (4.8 in)	63.0 mm (2.5 in)	4 years	55 of 100 (Notable)
20 September 1986	Ufa, RU	daily rain	35.4 mm (1.4 in)	23.1 mm (0.9 in)	17 years	53 of 100 (Notable)
20 September 1986	Canton L&D 20, US	all-time rain	166.9 mm (6.6 in)	29.7 mm (1.2 in)	13 years	52 of 100 (Notable)
20 September 1986	Luiz Alves, BR	daily rain	80.0 mm (3.1 in)	51.4 mm (2.0 in)	24 years	51 of 100 (Notable)
20 September 1986	Bloomington Wtr Wks, US	all-time rain	180.8 mm (7.1 in)	41.9 mm (1.6 in)	3 years	50 of 100 (Notable)
20 September 1986	Hirado, JP	daily rain	171.0 mm (6.7 in)	145.0 mm (5.7 in)	21 years	49 of 100 (Notable)
20 September 1986	Jasper, US	daily rain	71.9 mm (2.8 in)	47.3 mm (1.9 in)	15 years	49 of 100 (Notable)
20 September 1986	Labelle, US	daily rain	97.8 mm (3.9 in)	59.7 mm (2.4 in)	28 years	49 of 100 (Notable)
20 September 1986	Mt Pulaski, US	daily rain	71.1 mm (2.8 in)	38.1 mm (1.5 in)	36 years	48 of 100 (Notable)
20 September 1986	Mason City, US	daily rain	46.0 mm (1.8 in)	24.4 mm (1.0 in)	75 years	48 of 100 (Notable)
20 September 1986	Wahpeton 3 N, US	daily rain	31.0 mm (1.2 in)	15.8 mm (0.6 in)	73 years	47 of 100 (Notable)
20 September 1986	Decatur Wtp, US	daily rain	67.3 mm (2.6 in)	37.3 mm (1.5 in)	41 years	46 of 100 (Notable)
20 September 1986	Hitoyoshi, JP	daily rain	116.0 mm (4.6 in)	77.5 mm (3.1 in)	16 years	44 of 100 (Notable)
20 September 1986	Duvan, RU	daily rain	27.1 mm (1.1 in)	13.4 mm (0.5 in)	47 years	44 of 100 (Notable)
20 September 1986	Crater Lake Nps HQ, US	daily snow depth	38.1 cm (15.0 in)	35.6 cm (14.0 in)	27 years	44 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

1812 to 1986

Records set or tied on this calendar date in each year from 1812 to 1986. 1986 had 743 records.

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

Records on 09-20 in each year
Year	Records
1812	1
1837	1
1840	1
1844	1
1848	2
1851	1
1852	1
1854	2
1855	1
1856	2
1859	2
1860	1
1862	1
1870	1
1871	2
1882	2
1883	1
1884	1
1886	2
1887	1
1888	2
1889	8
1891	4
1893	5
1894	1
1895	2
1896	1
1897	16
1898	4
1899	1
1900	2
1901	3
1902	3
1903	3
1904	12
1905	8
1906	22
1907	11
1908	24
1909	10
1910	8
1911	21
1912	34
1913	48
1914	28
1915	239
1916	28
1917	100
1918	59
1919	55
1920	64
1921	40
1922	52
1923	249
1924	329
1925	330
1926	129
1927	169
1928	144
1929	373
1930	102
1931	564
1932	270
1933	223
1934	349
1935	201
1936	133
1937	385
1938	506
1939	312
1940	591
1941	582
1942	436
1943	419
1944	466
1945	406
1946	766
1947	460
1948	454
1949	268
1950	435
1951	267
1952	434
1953	479
1954	628
1955	625
1956	985
1957	514
1958	410
1959	489
1960	352
1961	384
1962	707
1963	290
1964	482
1965	1,180
1966	414
1967	449
1968	617
1969	604
1970	591
1971	884
1972	582
1973	569
1974	771
1975	527
1976	375
1977	776
1978	1,216
1979	767
1980	567
1981	979
1982	911
1983	1,958
1984	895
1985	730
1986	743
1987	856
1988	698
1989	968
1990	743
1991	1,835
1992	718
1993	1,031
1994	788
1995	1,374
1996	1,077
1997	1,282
1998	1,157
1999	923
2000	908
2001	821
2002	845
2003	910
2004	1,156
2005	960
2006	732
2007	645
2008	648
2009	715
2010	1,497
2011	650
2012	549
2013	595
2014	577
2015	439
2016	778
2017	920
2018	1,020
2019	835
2020	630
2021	565
2022	786
2023	482
2024	596
2025	877
2026	682

Download the Data

Data for records on 1986-09-20: 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 2026-10-18. Last revised 18 October 2026 (2026-10-18).

Margin	Records
0 to 50	580
50 to 100	12
100 to 150	1
150 to 200	0
200 to 250	0
250 to 300	0
300 to 350	0
350 to 400	1