Weather Records on 15 May 1986

679 weather records were set or tied worldwide on 15 May 1986. Highest significance: Parma, US.

Key Facts for 15 May 1986

On 15 May 1986, 679 weather records were set or tied at long-record stations worldwide.
241 were record highs and 159 were record lows, counting maximum and minimum temperature.
By timescale, 3 were all-time records, 14 monthly and 662 daily.
Parma set an all-time record daily precipitation of 195.8 mm (7.7 in) on 15 May 1986.
Across 162 earlier years (1820 to 2026) the same calendar date averaged 429 records.

Record Map

679 stations

679 station records on 15 May 1986 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 15 May 1986: highest significance records shown on the map
Station	Country	Type	Value	Significance
Parma	United States	Record daily precipitation	195.8 mm (7.7 in)	75 of 100 (Major)
Hartington	United States	Record daily precipitation	49.8 mm (2.0 in)	56 of 100 (Notable)
Marshall	United States	Record daily precipitation	153.2 mm (6.0 in)	55 of 100 (Notable)
Itaobim	Brazil	Record daily precipitation	38.1 mm (1.5 in)	53 of 100 (Notable)
Leitchfield 2 N	United States	Record daily precipitation	140.5 mm (5.5 in)	52 of 100 (Notable)
Mykland	Norway	Record daily precipitation	39.5 mm (1.6 in)	50 of 100 (Notable)
Troitsk	Russia	Record daily precipitation	42.6 mm (1.7 in)	50 of 100 (Notable)
Marathon	United States	Record high minimum temperature	26.7 C (80.1 F)	50 of 100 (Notable)
Prague 2W	United States	Record daily precipitation	101.6 mm (4.0 in)	49 of 100 (Notable)
Aseral	Norway	Record daily precipitation	48.2 mm (1.9 in)	47 of 100 (Notable)
Oake Marsh Farm	Australia	Record daily precipitation	35.0 mm (1.4 in)	46 of 100 (Notable)
Anna 4 N	United States	Record daily precipitation	87.1 mm (3.4 in)	46 of 100 (Notable)
Reedsburg Wwtp	United States	Record daily precipitation	49.3 mm (1.9 in)	46 of 100 (Notable)
Bellefontaine	United States	Record daily precipitation	50.5 mm (2.0 in)	45 of 100 (Notable)
Lookeba 1 N	United States	Record daily precipitation	81.8 mm (3.2 in)	44 of 100 (Notable)
Noondoonia	Australia	Record daily precipitation	29.0 mm (1.1 in)	43 of 100 (Notable)
Estes Park	United States	Record daily precipitation	35.1 mm (1.4 in)	43 of 100 (Notable)
Roxboro 7 ESE	United States	Record low maximum temperature	14.4 C (57.9 F)	42 of 100 (Notable)
Hopetoun	Australia	Record daily precipitation	26.2 mm (1.0 in)	41 of 100 (Notable)
Tuddal	Norway	Record daily precipitation	30.8 mm (1.2 in)	41 of 100 (Notable)
Dewar 2 NE	United States	Record daily precipitation	88.9 mm (3.5 in)	41 of 100 (Notable)
Norman 3SSE	United States	Record daily precipitation	82.6 mm (3.3 in)	41 of 100 (Notable)
Goldbutte 7 N	United States	Record daily snowfall	5.1 cm (2.0 in)	40 of 100 (Notable)
Kennett Radio Kboa	United States	Record daily precipitation	89.4 mm (3.5 in)	39 of 100 (Notable)
Checotah	United States	Record daily precipitation	87.1 mm (3.4 in)	39 of 100 (Notable)
Kojaneerup	Australia	Record daily precipitation	34.6 mm (1.4 in)	38 of 100 (Notable)
Shawnee	United States	Record daily precipitation	73.9 mm (2.9 in)	38 of 100 (Notable)
Fraser Range	Australia	Record daily precipitation	53.0 mm (2.1 in)	37 of 100 (Notable)
Vega de Alatorre	Mexico	Record high maximum temperature	41.7 C (107.1 F)	37 of 100 (Notable)
Guthrie 5S	United States	Record daily precipitation	81.3 mm (3.2 in)	37 of 100 (Notable)
Motozintla (Smn)	Mexico	Record low maximum temperature	23.3 C (73.9 F)	36 of 100 (Notable)
Risnes I Fjotland	Norway	Record daily precipitation	27.4 mm (1.1 in)	36 of 100 (Notable)
Anadarko 3 E	United States	Record daily precipitation	83.3 mm (3.3 in)	36 of 100 (Notable)
Hanna	United States	Record daily precipitation	81.8 mm (3.2 in)	36 of 100 (Notable)
Oberlin	United States	Record daily precipitation	38.6 mm (1.5 in)	35 of 100 (Notable)
Postmyr I Drangedal	Norway	Record daily precipitation	30.2 mm (1.2 in)	34 of 100 (Routine)
Bakke	Norway	Record daily precipitation	34.3 mm (1.4 in)	34 of 100 (Routine)
Hardy	United States	Record daily precipitation	32.3 mm (1.3 in)	34 of 100 (Routine)
Rjukan	Norway	Record daily precipitation	33.5 mm (1.3 in)	33 of 100 (Routine)
Colby 1SW	United States	Record daily precipitation	46.2 mm (1.8 in)	33 of 100 (Routine)
Haskell	United States	Record daily precipitation	84.1 mm (3.3 in)	33 of 100 (Routine)
Union City 3 SE	United States	Record daily precipitation	80.5 mm (3.2 in)	33 of 100 (Routine)
Ovre Sirdal	Norway	Record daily precipitation	26.9 mm (1.1 in)	32 of 100 (Routine)
Blanchard 2 SSW	United States	Record daily precipitation	92.5 mm (3.6 in)	32 of 100 (Routine)
Sallisaw 2 NW	United States	Record daily precipitation	64.8 mm (2.6 in)	32 of 100 (Routine)
Webbers Falls 5 WSW	United States	Record daily precipitation	74.2 mm (2.9 in)	32 of 100 (Routine)
Ottumwa Ind AP	United States	Record daily precipitation	42.9 mm (1.7 in)	32 of 100 (Routine)
Woodward	United States	Record daily precipitation	43.2 mm (1.7 in)	31 of 100 (Routine)
Young River	Australia	Record daily precipitation	32.0 mm (1.3 in)	30 of 100 (Routine)
Nicosia	Cyprus	Record low maximum temperature	22.7 C (72.9 F)	30 of 100 (Routine)
Saint Maries	United States	Record low minimum temperature	-2.2 C (28.0 F)	30 of 100 (Routine)
Poplar Bluff	United States	Record daily precipitation	77.5 mm (3.1 in)	30 of 100 (Routine)
Denton	United States	Record low maximum temperature	8.3 C (46.9 F)	30 of 100 (Routine)
Ekaterino-Nikolskoe	Russia	Record daily precipitation	25.8 mm (1.0 in)	29 of 100 (Routine)
Council	United States	Record low minimum temperature	-3.9 C (25.0 F)	29 of 100 (Routine)
Marshfield 4 WSW	United States	Record daily precipitation	82.6 mm (3.3 in)	29 of 100 (Routine)
Okemah	United States	Record daily precipitation	66.5 mm (2.6 in)	29 of 100 (Routine)
Purcell 2 SW	United States	Record daily precipitation	47.0 mm (1.9 in)	29 of 100 (Routine)
Tahlequah	United States	Record daily precipitation	67.3 mm (2.6 in)	29 of 100 (Routine)
Zoe 1 S	United States	Record daily precipitation	63.5 mm (2.5 in)	29 of 100 (Routine)

Counts by Type and Timescale

679 records

Records set or tied on 15 May 1986 by type: Highest daily maximum 132, Lowest daily maximum 49, Highest daily minimum 109, Lowest daily minimum 110, Heaviest daily rainfall 273, Heaviest daily snowfall 6.

Records on 15 May 1986 by type
Record type	Records
Highest daily maximum	132
Lowest daily maximum	49
Highest daily minimum	109
Lowest daily minimum	110
Heaviest daily rainfall	273
Heaviest daily snowfall	6
Deepest snow cover	0

Records on 15 May 1986 by timescale: all-time 3, monthly 14, daily 662.

How Much Records Were Beaten By

518 broken records

Margins by which the 518 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 90.5. Ties are not counted.

Top 20 by Significance

15 May 1986

Top 20 records on 15 May 1986 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
15 May 1986	Parma, US	all-time rain	195.8 mm (7.7 in)	57.4 mm (2.3 in)	51 years	75 of 100 (Major)
15 May 1986	Hartington, US	daily rain	49.8 mm (2.0 in)	26.7 mm (1.1 in)	87 years	56 of 100 (Notable)
15 May 1986	Marshall, US	monthly rain	153.2 mm (6.0 in)	90.5 mm (3.6 in)	3 years	55 of 100 (Notable)
15 May 1986	Itaobim, BR	daily rain	38.1 mm (1.5 in)	37.1 mm (1.5 in)	35 years	53 of 100 (Notable)
15 May 1986	Leitchfield 2 N, US	monthly rain	140.5 mm (5.5 in)	35.6 mm (1.4 in)	19 years	52 of 100 (Notable)
15 May 1986	Mykland, NO	daily rain	39.5 mm (1.6 in)	12.7 mm (0.5 in)	80 years	50 of 100 (Notable)
15 May 1986	Troitsk, RU	daily rain	42.6 mm (1.7 in)	32.9 mm (1.3 in)	19 years	50 of 100 (Notable)
15 May 1986	Marathon, US	monthly high min	26.7 C (80.1 F)	3.4 C (6.1 F)	76 years	50 of 100 (Notable)
15 May 1986	Prague 2W, US	daily rain	101.6 mm (4.0 in)	65.8 mm (2.6 in)	29 years	49 of 100 (Notable)
15 May 1986	Aseral, NO	daily rain	48.2 mm (1.9 in)	13.0 mm (0.5 in)	80 years	47 of 100 (Notable)
15 May 1986	Oake Marsh Farm, AU	daily rain	35.0 mm (1.4 in)	22.3 mm (0.9 in)	33 years	46 of 100 (Notable)
15 May 1986	Anna 4 N, US	daily rain	87.1 mm (3.4 in)	27.9 mm (1.1 in)	63 years	46 of 100 (Notable)
15 May 1986	Reedsburg Wwtp, US	daily rain	49.3 mm (1.9 in)	28.0 mm (1.1 in)	37 years	46 of 100 (Notable)
15 May 1986	Bellefontaine, US	daily rain	50.5 mm (2.0 in)	9.9 mm (0.39 in)	87 years	45 of 100 (Notable)
15 May 1986	Lookeba 1 N, US	daily rain	81.8 mm (3.2 in)	57.7 mm (2.3 in)	39 years	44 of 100 (Notable)
15 May 1986	Noondoonia, AU	daily rain	29.0 mm (1.1 in)	13.8 mm (0.5 in)	32 years	43 of 100 (Notable)
15 May 1986	Estes Park, US	daily rain	35.1 mm (1.4 in)	19.6 mm (0.8 in)	35 years	43 of 100 (Notable)
15 May 1986	Roxboro 7 ESE, US	daily low max	14.4 C (57.9 F)	2.8 C (5.0 F)	90 years	42 of 100 (Notable)
15 May 1986	Hopetoun, AU	daily rain	26.2 mm (1.0 in)	16.8 mm (0.7 in)	33 years	41 of 100 (Notable)
15 May 1986	Tuddal, NO	daily rain	30.8 mm (1.2 in)	5.3 mm (0.21 in)	80 years	41 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

1820 to 1986

Records set or tied on this calendar date in each year from 1820 to 1986. 1986 had 679 records.

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

Records on 05-15 in each year
Year	Records
1820	1
1825	1
1831	1
1832	1
1837	2
1845	1
1847	2
1848	1
1855	2
1857	2
1859	1
1862	1
1863	1
1865	1
1866	2
1867	1
1868	2
1870	1
1871	3
1874	2
1876	4
1878	1
1879	2
1881	1
1883	1
1885	1
1886	2
1888	3
1891	3
1893	5
1894	2
1895	4
1896	2
1897	4
1898	3
1899	9
1900	9
1901	2
1902	9
1903	4
1904	13
1905	16
1906	10
1907	27
1908	25
1909	89
1910	27
1911	27
1912	26
1913	60
1914	16
1915	236
1916	27
1917	80
1918	133
1919	25
1920	58
1921	92
1922	30
1923	125
1924	174
1925	100
1926	161
1927	191
1928	144
1929	161
1930	136
1931	459
1932	368
1933	439
1934	227
1935	288
1936	372
1937	373
1938	393
1939	351
1940	179
1941	454
1942	701
1943	568
1944	630
1945	588
1946	238
1947	334
1948	264
1949	363
1950	260
1951	736
1952	476
1953	426
1954	355
1955	538
1956	466
1957	521
1958	605
1959	764
1960	291
1961	508
1962	1,128
1963	782
1964	347
1965	320
1966	389
1967	609
1968	1,019
1969	790
1970	512
1971	351
1972	484
1973	818
1974	1,230
1975	372
1976	803
1977	1,186
1978	922
1979	404
1980	625
1981	586
1982	500
1983	1,215
1984	1,059
1985	649
1986	679
1987	1,073
1988	643
1989	552
1990	776
1991	1,179
1992	944
1993	784
1994	910
1995	1,750
1996	1,452
1997	1,175
1998	1,641
1999	810
2000	850
2001	1,280
2002	801
2003	1,023
2004	1,046
2005	767
2006	955
2007	949
2008	995
2009	675
2010	1,088
2011	1,298
2012	751
2013	1,081
2014	1,411
2015	717
2016	890
2017	435
2018	1,074
2019	627
2020	472
2021	412
2022	847
2023	566
2024	596
2025	801
2026	481

Download the Data

Data for records on 1986-05-15: 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).