Weather Records on 17 May 1991

1,237 weather records were set or tied worldwide on 17 May 1991. Highest significance: Pendleton Dwtn, US.

Key Facts for 17 May 1991

On 17 May 1991, 1,237 weather records were set or tied at long-record stations worldwide.
525 were record highs and 277 were record lows, counting maximum and minimum temperature.
By timescale, 7 were all-time records, 40 monthly and 1,190 daily.
Pendleton Dwtn set a daily record precipitation of 29.0 mm (1.1 in) on 17 May 1991.
Across 167 earlier years (1802 to 2026) the same calendar date averaged 430 records.

Record Map

1,237 stations

1,237 station records on 17 May 1991 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 May 1991: highest significance records shown on the map
Station	Country	Type	Value	Significance
Pendleton Dwtn	United States	Record daily precipitation	29.0 mm (1.1 in)	72 of 100 (Major)
Vale	United States	Record daily precipitation	31.2 mm (1.2 in)	71 of 100 (Major)
Allison	United States	Record daily precipitation	76.2 mm (3.0 in)	68 of 100 (Major)
Wien	Austria	Record daily precipitation	84.9 mm (3.3 in)	65 of 100 (Major)
Coloso	Puerto Rico [United States]	Record daily precipitation	154.9 mm (6.1 in)	65 of 100 (Major)
Cottage Grove Dam	United States	Record daily precipitation	62.5 mm (2.5 in)	62 of 100 (Major)
Bajanaul	Kazakhstan	Record daily precipitation	40.9 mm (1.6 in)	61 of 100 (Major)
Cottage Grove 2E	United States	Record daily precipitation	51.1 mm (2.0 in)	61 of 100 (Major)
Millbrook	United States	Record daily precipitation	55.9 mm (2.2 in)	59 of 100 (Notable)
Dover	United States	Record daily precipitation	74.9 mm (2.9 in)	57 of 100 (Notable)
O'Neill	United States	Record daily precipitation	42.4 mm (1.7 in)	54 of 100 (Notable)
Headworks Portland Wtr B	United States	Record daily precipitation	69.6 mm (2.7 in)	54 of 100 (Notable)
Ione 18 S	United States	Record daily precipitation	26.7 mm (1.1 in)	54 of 100 (Notable)
Deer Flat Dam	United States	Record daily precipitation	25.9 mm (1.0 in)	53 of 100 (Notable)
Medford Exp STN	United States	Record daily precipitation	34.0 mm (1.3 in)	53 of 100 (Notable)
Walla Walla Rgnl AP	United States	Record daily precipitation	37.8 mm (1.5 in)	53 of 100 (Notable)
Elista	Russia	Record daily precipitation	26.4 mm (1.0 in)	52 of 100 (Notable)
Kaspiyskiy	Russia	Record daily precipitation	32.4 mm (1.3 in)	52 of 100 (Notable)
Cascadia	United States	Record daily precipitation	62.7 mm (2.5 in)	52 of 100 (Notable)
Milton Freewater	United States	Record daily precipitation	29.0 mm (1.1 in)	52 of 100 (Notable)
Iowa Falls	United States	Record daily precipitation	43.7 mm (1.7 in)	51 of 100 (Notable)
Purdum	United States	Record daily precipitation	89.9 mm (3.5 in)	51 of 100 (Notable)
Liman	Russia	Record daily precipitation	31.2 mm (1.2 in)	50 of 100 (Notable)
Krasnaja Poljana	Russia	Record daily precipitation	90.9 mm (3.6 in)	50 of 100 (Notable)
Hvar	Croatia	Record low maximum temperature	13.3 C (55.9 F)	49 of 100 (Notable)
Hutchinson 1 N	United States	Record daily precipitation	54.1 mm (2.1 in)	49 of 100 (Notable)
Parma	United States	Record daily precipitation	94.7 mm (3.7 in)	48 of 100 (Notable)
Atkinson 3SW	United States	Record daily precipitation	63.5 mm (2.5 in)	48 of 100 (Notable)
Estacada 2 SE	United States	Record daily precipitation	45.0 mm (1.8 in)	48 of 100 (Notable)
Summerville 4W	United States	Record daily precipitation	60.7 mm (2.4 in)	48 of 100 (Notable)
Alto 5 SW	United States	Record daily precipitation	88.9 mm (3.5 in)	48 of 100 (Notable)
Russell Island	Australia	Record daily precipitation	156.0 mm (6.1 in)	47 of 100 (Notable)
Gavins Point Dam	United States	Record daily precipitation	55.9 mm (2.2 in)	47 of 100 (Notable)
Dorena	United States	Record daily precipitation	56.9 mm (2.2 in)	47 of 100 (Notable)
Kuscevskaja	Russia	Record daily precipitation	41.7 mm (1.6 in)	46 of 100 (Notable)
Frankfort 2NE	United States	Record daily precipitation	45.5 mm (1.8 in)	46 of 100 (Notable)
Warren 3 S	United States	Record high minimum temperature	20.6 C (69.1 F)	46 of 100 (Notable)
Sheaville 1 SE	United States	Record daily precipitation	33.3 mm (1.3 in)	46 of 100 (Notable)
Norfolk Karl Stefan Mem AP	United States	Record daily precipitation	82.0 mm (3.2 in)	46 of 100 (Notable)
Baker City AP	United States	Record daily precipitation	35.8 mm (1.4 in)	46 of 100 (Notable)
Waterloo Muni AP	United States	Record daily precipitation	67.1 mm (2.6 in)	46 of 100 (Notable)
Kremsmuenster	Austria	Record daily precipitation	28.2 mm (1.1 in)	45 of 100 (Notable)
T Uleniy-Ostrov	Russia	Record daily precipitation	57.3 mm (2.3 in)	45 of 100 (Notable)
Lake Spaulding	United States	Record daily snowfall	24.1 cm (9.5 in)	45 of 100 (Notable)
Herkimer	United States	Record daily precipitation	68.6 mm (2.7 in)	45 of 100 (Notable)
Patterson	United States	Record daily precipitation	90.9 mm (3.6 in)	44 of 100 (Notable)
Middletown 4 W	United States	Record high minimum temperature	16.7 C (62.1 F)	43 of 100 (Notable)
Portland Intl AP	United States	Record daily precipitation	30.5 mm (1.2 in)	43 of 100 (Notable)
Manzanita Lake	United States	Record daily snowfall	27.9 cm (11.0 in)	42 of 100 (Notable)
Norwalk Wwtp	United States	Record high minimum temperature	20.6 C (69.1 F)	41 of 100 (Notable)
Scotts Mills 9 SE	United States	Record daily precipitation	69.1 mm (2.7 in)	41 of 100 (Notable)
Salem AP (McNary Field)	United States	Record daily precipitation	44.7 mm (1.8 in)	41 of 100 (Notable)
Santa Barbara	United States	Record low minimum temperature	3.3 C (37.9 F)	40 of 100 (Notable)
Plant City	United States	Record daily precipitation	40.6 mm (1.6 in)	40 of 100 (Notable)
Rockville	United States	Record high minimum temperature	19.4 C (66.9 F)	40 of 100 (Notable)
Belle Plaine	United States	Record daily precipitation	45.0 mm (1.8 in)	40 of 100 (Notable)
Kanawha	United States	Record daily precipitation	50.3 mm (2.0 in)	40 of 100 (Notable)
Delaware	United States	Record high minimum temperature	20.0 C (68.0 F)	40 of 100 (Notable)
Idleyld Park 4 NE	United States	Record daily precipitation	36.1 mm (1.4 in)	40 of 100 (Notable)
Oregon City	United States	Record daily precipitation	48.3 mm (1.9 in)	40 of 100 (Notable)

Counts by Type and Timescale

1,237 records

Records set or tied on 17 May 1991 by type: Highest daily maximum 155, Lowest daily maximum 176, Highest daily minimum 370, Lowest daily minimum 101, Heaviest daily rainfall 411, Heaviest daily snowfall 16, Deepest snow cover 8.

Records on 17 May 1991 by type
Record type	Records
Highest daily maximum	155
Lowest daily maximum	176
Highest daily minimum	370
Lowest daily minimum	101
Heaviest daily rainfall	411
Heaviest daily snowfall	16
Deepest snow cover	8

Records on 17 May 1991 by timescale: all-time 7, monthly 40, daily 1,190.

How Much Records Were Beaten By

971 broken records

Margins by which the 971 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 254.0. Ties are not counted.

Top 20 by Significance

17 May 1991

Top 20 records on 17 May 1991 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 May 1991	Pendleton Dwtn, US	daily rain	29.0 mm (1.1 in)	20.6 mm (0.8 in)	76 years	72 of 100 (Major)
17 May 1991	Vale, US	daily rain	31.2 mm (1.2 in)	16.0 mm (0.6 in)	91 years	71 of 100 (Major)
17 May 1991	Allison, US	daily rain	76.2 mm (3.0 in)	49.3 mm (1.9 in)	72 years	68 of 100 (Major)
17 May 1991	Wien, AT	daily rain	84.9 mm (3.3 in)	34.4 mm (1.4 in)	54 years	65 of 100 (Major)
17 May 1991	Coloso, PR	daily rain	154.9 mm (6.1 in)	82.3 mm (3.2 in)	53 years	65 of 100 (Major)
17 May 1991	Cottage Grove Dam, US	monthly rain	62.5 mm (2.5 in)	23.9 mm (0.9 in)	28 years	62 of 100 (Major)
17 May 1991	Bajanaul, KZ	daily rain	40.9 mm (1.6 in)	33.1 mm (1.3 in)	54 years	61 of 100 (Major)
17 May 1991	Cottage Grove 2E, US	daily rain	51.1 mm (2.0 in)	33.8 mm (1.3 in)	49 years	61 of 100 (Major)
17 May 1991	Millbrook, US	daily rain	55.9 mm (2.2 in)	41.7 mm (1.6 in)	48 years	59 of 100 (Notable)
17 May 1991	Dover, US	daily rain	74.9 mm (2.9 in)	51.8 mm (2.0 in)	56 years	57 of 100 (Notable)
17 May 1991	O'Neill, US	daily rain	42.4 mm (1.7 in)	19.5 mm (0.8 in)	92 years	54 of 100 (Notable)
17 May 1991	Headworks Portland Wtr B, US	monthly rain	69.6 mm (2.7 in)	7.4 mm (0.29 in)	91 years	54 of 100 (Notable)
17 May 1991	Ione 18 S, US	daily rain	26.7 mm (1.1 in)	19.8 mm (0.8 in)	49 years	54 of 100 (Notable)
17 May 1991	Deer Flat Dam, US	daily rain	25.9 mm (1.0 in)	18.8 mm (0.7 in)	29 years	53 of 100 (Notable)
17 May 1991	Medford Exp STN, US	daily rain	34.0 mm (1.3 in)	29.7 mm (1.2 in)	26 years	53 of 100 (Notable)
17 May 1991	Walla Walla Rgnl AP, US	daily rain	37.8 mm (1.5 in)	30.9 mm (1.2 in)	32 years	53 of 100 (Notable)
17 May 1991	Elista, RU	daily rain	26.4 mm (1.0 in)	18.7 mm (0.7 in)	57 years	52 of 100 (Notable)
17 May 1991	Kaspiyskiy, RU	daily rain	32.4 mm (1.3 in)	29.8 mm (1.2 in)	30 years	52 of 100 (Notable)
17 May 1991	Cascadia, US	monthly rain	62.7 mm (2.5 in)	17.0 mm (0.7 in)	42 years	52 of 100 (Notable)
17 May 1991	Milton Freewater, US	daily rain	29.0 mm (1.1 in)	16.8 mm (0.7 in)	49 years	52 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

1802 to 1991

Records set or tied on this calendar date in each year from 1802 to 1991. 1991 had 1,237 records.

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

Records on 05-17 in each year
Year	Records
1802	2
1803	1
1808	1
1816	1
1834	1
1837	1
1839	1
1847	2
1848	1
1851	1
1853	1
1855	1
1858	1
1859	1
1861	2
1862	2
1863	2
1864	1
1871	2
1872	2
1873	2
1874	4
1877	1
1878	1
1879	2
1880	1
1881	1
1882	2
1883	3
1885	1
1887	1
1888	2
1889	3
1891	8
1892	4
1893	3
1895	8
1896	2
1897	3
1898	6
1899	7
1900	12
1901	2
1902	3
1903	9
1904	12
1905	10
1906	22
1907	10
1908	5
1909	33
1910	16
1911	30
1912	16
1913	24
1914	24
1915	53
1916	49
1917	18
1918	56
1919	35
1920	46
1921	50
1922	30
1923	95
1924	80
1925	326
1926	133
1927	264
1928	127
1929	168
1930	421
1931	201
1932	288
1933	365
1934	373
1935	341
1936	270
1937	183
1938	340
1939	285
1940	338
1941	408
1942	589
1943	855
1944	521
1945	799
1946	586
1947	249
1948	412
1949	544
1950	371
1951	373
1952	777
1953	441
1954	298
1955	570
1956	1,166
1957	469
1958	331
1959	488
1960	402
1961	291
1962	1,325
1963	368
1964	417
1965	462
1966	489
1967	644
1968	564
1969	638
1970	711
1971	723
1972	610
1973	1,016
1974	1,302
1975	365
1976	426
1977	1,078
1978	872
1979	459
1980	768
1981	940
1982	476
1983	1,326
1984	925
1985	561
1986	921
1987	1,054
1988	1,096
1989	1,307
1990	1,135
1991	1,237
1992	1,025
1993	495
1994	858
1995	1,734
1996	1,706
1997	1,619
1998	1,080
1999	795
2000	825
2001	960
2002	964
2003	1,127
2004	769
2005	784
2006	1,522
2007	742
2008	1,309
2009	1,050
2010	880
2011	1,483
2012	711
2013	739
2014	1,062
2015	824
2016	741
2017	1,302
2018	726
2019	686
2020	496
2021	443
2022	479
2023	385
2024	566
2025	928
2026	745

Download the Data

Data for records on 1991-05-17: 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 50	953
50 to 100	15
100 to 150	1
150 to 200	1
200 to 250	0
250 to 300	1