Weather Records on 17 May 1999

795 weather records were set or tied worldwide on 17 May 1999. Highest significance: Lancaster 4 WSW, US.

Key Facts for 17 May 1999

On 17 May 1999, 795 weather records were set or tied at long-record stations worldwide.
307 were record highs and 260 were record lows, counting maximum and minimum temperature.
By timescale, 5 were all-time records, 26 monthly and 764 daily.
Lancaster 4 WSW set a daily record precipitation of 71.1 mm (2.8 in) on 17 May 1999.
Across 167 earlier years (1802 to 2026) the same calendar date averaged 432 records.

Record Map

795 stations

795 station records on 17 May 1999 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 May 1999: highest significance records shown on the map
Station	Country	Type	Value	Significance
Lancaster 4 WSW	United States	Record daily precipitation	71.1 mm (2.8 in)	76 of 100 (Major)
Kursk	Russia	Record daily precipitation	41.1 mm (1.6 in)	70 of 100 (Major)
Galena	United States	Record daily precipitation	63.5 mm (2.5 in)	63 of 100 (Major)
Krasnaja_Gora	Russia	Record daily precipitation	38.3 mm (1.5 in)	60 of 100 (Major)
Trubcevsk	Russia	Record daily precipitation	49.8 mm (2.0 in)	60 of 100 (Major)
Mont-Aigoual	France	Record daily precipitation	192.0 mm (7.6 in)	57 of 100 (Notable)
Fayette	United States	Record daily precipitation	157.5 mm (6.2 in)	54 of 100 (Notable)
Waianae 798	United States	Record daily precipitation	41.7 mm (1.6 in)	54 of 100 (Notable)
Slavgorod	Belarus	Record daily precipitation	27.9 mm (1.1 in)	52 of 100 (Notable)
Elkader 6 SSW	United States	Record daily precipitation	114.3 mm (4.5 in)	52 of 100 (Notable)
Charmany Farm	United States	Record daily precipitation	58.4 mm (2.3 in)	52 of 100 (Notable)
Voronez	Russia	Record daily precipitation	40.1 mm (1.6 in)	51 of 100 (Notable)
Kaneohe 838.1	United States	Record daily precipitation	55.1 mm (2.2 in)	51 of 100 (Notable)
Ponyri	Russia	Record daily precipitation	37.3 mm (1.5 in)	50 of 100 (Notable)
Baraboo Wwtp	United States	Record daily precipitation	41.4 mm (1.6 in)	50 of 100 (Notable)
Reine	Norway	Record daily precipitation	54.4 mm (2.1 in)	49 of 100 (Notable)
Oconomowoc Wwtp	United States	Record daily precipitation	57.2 mm (2.3 in)	49 of 100 (Notable)
Dubuque L&D 11	United States	Record daily precipitation	67.6 mm (2.7 in)	47 of 100 (Notable)
Sac City	United States	Record daily precipitation	48.3 mm (1.9 in)	47 of 100 (Notable)
Moanalua 770	United States	Record daily precipitation	43.2 mm (1.7 in)	47 of 100 (Notable)
Millau	France	Record daily precipitation	59.0 mm (2.3 in)	46 of 100 (Notable)
Ostrov Sosnovez	Russia	Record low minimum temperature	-10.2 C (13.6 F)	46 of 100 (Notable)
Brjansk	Russia	Record daily precipitation	45.0 mm (1.8 in)	46 of 100 (Notable)
Verhoture	Russia	Record daily precipitation	31.0 mm (1.2 in)	46 of 100 (Notable)
Prairie du Chien	United States	Record daily precipitation	50.8 mm (2.0 in)	46 of 100 (Notable)
Bayfield 6 N	United States	Record daily precipitation	25.4 mm (1.0 in)	44 of 100 (Notable)
Bogoroditskoye-Fenino	Russia	Record daily precipitation	38.0 mm (1.5 in)	43 of 100 (Notable)
Alma Dam 4	United States	Record daily precipitation	63.5 mm (2.5 in)	43 of 100 (Notable)
Fond du Lac Wwtp	United States	Record daily precipitation	45.0 mm (1.8 in)	43 of 100 (Notable)
Lake Mills Wwtp	United States	Record daily precipitation	81.3 mm (3.2 in)	43 of 100 (Notable)
South Pass City	United States	Record low minimum temperature	-11.7 C (10.9 F)	43 of 100 (Notable)
Austin-Camp Mabry	United States	Record daily precipitation	100.3 mm (3.9 in)	42 of 100 (Notable)
Portland	United States	Record high maximum temperature	35.6 C (96.1 F)	41 of 100 (Notable)
Mondovi	United States	Record daily precipitation	49.0 mm (1.9 in)	41 of 100 (Notable)
Coalville	United States	Record low minimum temperature	-5.6 C (21.9 F)	41 of 100 (Notable)
Aracas	Brazil	Record daily precipitation	105.9 mm (4.2 in)	40 of 100 (Notable)
Rylsk	Russia	Record daily precipitation	41.5 mm (1.6 in)	40 of 100 (Notable)
Delphi 2 N	United States	Record high minimum temperature	20.6 C (69.1 F)	40 of 100 (Notable)
Corning	United States	Record daily precipitation	35.6 mm (1.4 in)	40 of 100 (Notable)
Blanchardville #2	United States	Record daily precipitation	64.8 mm (2.6 in)	40 of 100 (Notable)
Brodhead Wwtp	United States	Record daily precipitation	33.0 mm (1.3 in)	40 of 100 (Notable)
Luroy	Norway	Record daily precipitation	79.0 mm (3.1 in)	39 of 100 (Notable)
Tripoli	United States	Record daily precipitation	140.5 mm (5.5 in)	39 of 100 (Notable)
Mt Mary College	United States	Record daily precipitation	45.5 mm (1.8 in)	39 of 100 (Notable)
Richland Ctr	United States	Record daily precipitation	61.0 mm (2.4 in)	39 of 100 (Notable)
Lake Yellowstone	United States	Record daily snowfall	7.6 cm (3.0 in)	39 of 100 (Notable)
Kokomo 3 WSW	United States	Record high minimum temperature	18.9 C (66.0 F)	38 of 100 (Notable)
Upper Baker Dam	United States	Record daily precipitation	41.1 mm (1.6 in)	38 of 100 (Notable)
Menomonie	United States	Record daily precipitation	39.4 mm (1.6 in)	38 of 100 (Notable)
Plymouth Wwtp	United States	Record daily precipitation	45.2 mm (1.8 in)	38 of 100 (Notable)
Portage Wwtp	United States	Record daily precipitation	34.8 mm (1.4 in)	38 of 100 (Notable)
West Bend	United States	Record daily precipitation	34.8 mm (1.4 in)	38 of 100 (Notable)
Bjorkasen	Norway	Record daily precipitation	33.5 mm (1.3 in)	37 of 100 (Notable)
Sheboygan	United States	Record daily precipitation	36.1 mm (1.4 in)	37 of 100 (Notable)
Krakmo	Norway	Record daily precipitation	37.4 mm (1.5 in)	36 of 100 (Notable)
Lifton Pumping STN	United States	Record low minimum temperature	-6.1 C (21.0 F)	36 of 100 (Notable)
Oakland	United States	Record daily precipitation	71.6 mm (2.8 in)	36 of 100 (Notable)
Riverdale	United States	Record daily precipitation	29.7 mm (1.2 in)	36 of 100 (Notable)
Conconully	United States	Record low maximum temperature	10.6 C (51.1 F)	36 of 100 (Notable)
Gomel	Belarus	Record daily precipitation	40.2 mm (1.6 in)	35 of 100 (Notable)

Counts by Type and Timescale

795 records

Records set or tied on 17 May 1999 by type: Highest daily maximum 145, Lowest daily maximum 65, Highest daily minimum 162, Lowest daily minimum 195, Heaviest daily rainfall 223, Heaviest daily snowfall 2, Deepest snow cover 3.

Records on 17 May 1999 by type
Record type	Records
Highest daily maximum	145
Lowest daily maximum	65
Highest daily minimum	162
Lowest daily minimum	195
Heaviest daily rainfall	223
Heaviest daily snowfall	2
Deepest snow cover	3

Records on 17 May 1999 by timescale: all-time 5, monthly 26, daily 764.

How Much Records Were Beaten By

575 broken records

Margins by which the 575 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 407.0. Ties are not counted.

Top 20 by Significance

17 May 1999

Top 20 records on 17 May 1999 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 May 1999	Lancaster 4 WSW, US	daily rain	71.1 mm (2.8 in)	45.7 mm (1.8 in)	88 years	76 of 100 (Major)
17 May 1999	Kursk, RU	daily rain	41.1 mm (1.6 in)	26.7 mm (1.1 in)	68 years	70 of 100 (Major)
17 May 1999	Galena, US	daily rain	63.5 mm (2.5 in)	40.6 mm (1.6 in)	60 years	63 of 100 (Major)
17 May 1999	Krasnaja_Gora, RU	daily rain	38.3 mm (1.5 in)	27.4 mm (1.1 in)	44 years	60 of 100 (Major)
17 May 1999	Trubcevsk, RU	monthly rain	49.8 mm (2.0 in)	17.8 mm (0.7 in)	31 years	60 of 100 (Major)
17 May 1999	Mont-Aigoual, FR	daily rain	192.0 mm (7.6 in)	71.0 mm (2.8 in)	61 years	57 of 100 (Notable)
17 May 1999	Fayette, US	all-time rain	157.5 mm (6.2 in)	23.4 mm (0.9 in)	17 years	54 of 100 (Notable)
17 May 1999	Waianae 798, US	daily rain	41.7 mm (1.6 in)	29.3 mm (1.2 in)	48 years	54 of 100 (Notable)
17 May 1999	Slavgorod, BY	daily rain	27.9 mm (1.1 in)	18.5 mm (0.7 in)	40 years	52 of 100 (Notable)
17 May 1999	Elkader 6 SSW, US	monthly rain	114.3 mm (4.5 in)	34.5 mm (1.4 in)	3 years	52 of 100 (Notable)
17 May 1999	Charmany Farm, US	daily rain	58.4 mm (2.3 in)	42.1 mm (1.7 in)	29 years	52 of 100 (Notable)
17 May 1999	Voronez, RU	daily rain	40.1 mm (1.6 in)	19.6 mm (0.8 in)	45 years	51 of 100 (Notable)
17 May 1999	Kaneohe 838.1, US	daily rain	55.1 mm (2.2 in)	48.2 mm (1.9 in)	8 years	51 of 100 (Notable)
17 May 1999	Ponyri, RU	daily rain	37.3 mm (1.5 in)	29.9 mm (1.2 in)	22 years	50 of 100 (Notable)
17 May 1999	Baraboo Wwtp, US	daily rain	41.4 mm (1.6 in)	10.4 mm (0.4 in)	104 years	50 of 100 (Notable)
17 May 1999	Reine, NO	daily rain	54.4 mm (2.1 in)	40.4 mm (1.6 in)	20 years	49 of 100 (Notable)
17 May 1999	Oconomowoc Wwtp, US	daily rain	57.2 mm (2.3 in)	29.5 mm (1.2 in)	12 years	49 of 100 (Notable)
17 May 1999	Dubuque L&D 11, US	daily rain	67.6 mm (2.7 in)	41.9 mm (1.6 in)	12 years	47 of 100 (Notable)
17 May 1999	Sac City, US	daily rain	48.3 mm (1.9 in)	8.9 mm (0.35 in)	102 years	47 of 100 (Notable)
17 May 1999	Moanalua 770, US	daily rain	43.2 mm (1.7 in)	12.5 mm (0.5 in)	72 years	47 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 1999

Records set or tied on this calendar date in each year from 1802 to 1999. 1999 had 795 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 1999-05-17: 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 100	573
100 to 200	0
200 to 300	0
300 to 400	1
400 to 500	1