Weather Records on 18 May 1999

584 weather records were set or tied worldwide on 18 May 1999. Highest significance: Elec, RU.

Key Facts for 18 May 1999

On 18 May 1999, 584 weather records were set or tied at long-record stations worldwide.
222 were record highs and 191 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 14 monthly and 570 daily.
Elec set a monthly record daily precipitation of 46.0 mm (1.8 in) on 18 May 1999.
Across 164 earlier years (1796 to 2026) the same calendar date averaged 442 records.

Record Map

584 stations

584 station records on 18 May 1999 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 May 1999: highest significance records shown on the map
Station	Country	Type	Value	Significance
Elec	Russia	Record daily precipitation	46.0 mm (1.8 in)	51 of 100 (Notable)
Muscoda	United States	Record daily precipitation	58.9 mm (2.3 in)	51 of 100 (Notable)
Ebano	Mexico	Record daily precipitation	52.8 mm (2.1 in)	50 of 100 (Notable)
Ponyri	Russia	Record daily precipitation	33.8 mm (1.3 in)	50 of 100 (Notable)
Kenton	United States	Record daily precipitation	39.4 mm (1.6 in)	45 of 100 (Notable)
Cerralvo (Dge)	Mexico	Record daily precipitation	77.0 mm (3.0 in)	44 of 100 (Notable)
Lac Vieux Desert	United States	Record daily precipitation	32.3 mm (1.3 in)	44 of 100 (Notable)
Leirfjord	Norway	Record daily precipitation	46.2 mm (1.8 in)	43 of 100 (Notable)
Inza	Russia	Record daily precipitation	30.5 mm (1.2 in)	43 of 100 (Notable)
Ann Arbor U of Mich	United States	Record daily precipitation	43.7 mm (1.7 in)	42 of 100 (Notable)
Stambaugh 2SSE	United States	Record daily precipitation	28.7 mm (1.1 in)	42 of 100 (Notable)
Bergland Dam	United States	Record daily precipitation	27.9 mm (1.1 in)	41 of 100 (Notable)
Summit Lake	United States	Record daily precipitation	39.9 mm (1.6 in)	41 of 100 (Notable)
Misurata	Libya	Record high minimum temperature	26.9 C (80.4 F)	40 of 100 (Notable)
Westfield 2 SSE	United States	Record daily precipitation	30.5 mm (1.2 in)	40 of 100 (Notable)
Benavides #2	United States	Record daily precipitation	55.9 mm (2.2 in)	40 of 100 (Notable)
Conconully	United States	Record low maximum temperature	11.1 C (52.0 F)	40 of 100 (Notable)
Hayward Rs	United States	Record daily precipitation	44.5 mm (1.8 in)	40 of 100 (Notable)
Drevja	Norway	Record daily precipitation	33.2 mm (1.3 in)	39 of 100 (Notable)
Ness City	United States	Record low minimum temperature	2.8 C (37.0 F)	39 of 100 (Notable)
Enosburg Falls	United States	Record high minimum temperature	16.1 C (61.0 F)	39 of 100 (Notable)
Sulitjelma	Norway	Record daily precipitation	30.4 mm (1.2 in)	38 of 100 (Notable)
Greenwood	United States	Record daily precipitation	83.8 mm (3.3 in)	38 of 100 (Notable)
Lavon Dam	United States	Record daily precipitation	99.3 mm (3.9 in)	38 of 100 (Notable)
Sulphur Springs	United States	Record daily precipitation	103.6 mm (4.1 in)	38 of 100 (Notable)
Jopala (Cfe)	Mexico	Record daily precipitation	146.1 mm (5.8 in)	37 of 100 (Notable)
Xicotepec de Juarez	Mexico	Record daily precipitation	102.9 mm (4.1 in)	37 of 100 (Notable)
Ostrov Sosnovez	Russia	Record low minimum temperature	-7.3 C (18.9 F)	37 of 100 (Notable)
Gonzales 2S	United States	Record daily precipitation	76.2 mm (3.0 in)	37 of 100 (Notable)
Verhneimbatsk	Russia	Record high minimum temperature	13.3 C (55.9 F)	36 of 100 (Notable)
Shenkursk	Russia	Record low maximum temperature	1.9 C (35.4 F)	35 of 100 (Notable)
Montello 2NE	United States	Record low minimum temperature	-6.1 C (21.0 F)	35 of 100 (Notable)
Slippery Rock 1 SSW	United States	Record daily precipitation	43.2 mm (1.7 in)	35 of 100 (Notable)
Crohamhurst	Australia	Record daily precipitation	77.2 mm (3.0 in)	34 of 100 (Routine)
Fordyce	United States	Record daily precipitation	57.4 mm (2.3 in)	34 of 100 (Routine)
Angola	United States	Record daily precipitation	61.2 mm (2.4 in)	34 of 100 (Routine)
Las Adjuntas	Mexico	Record daily precipitation	62.0 mm (2.4 in)	33 of 100 (Routine)
Bely Island	Russia	Record low maximum temperature	-17.8 C (0.0 F)	33 of 100 (Routine)
Sandusky	United States	Record daily precipitation	43.2 mm (1.7 in)	33 of 100 (Routine)
Spirit Falls	United States	Record daily precipitation	36.8 mm (1.4 in)	33 of 100 (Routine)
Lerma	Mexico	Record high maximum temperature	31.7 C (89.1 F)	32 of 100 (Routine)
Leitchfield 2 N	United States	Record high minimum temperature	20.6 C (69.1 F)	32 of 100 (Routine)
Galesville 2WSW	United States	Record daily precipitation	26.2 mm (1.0 in)	32 of 100 (Routine)
Whittier	United States	Record snow depth	109.2 cm (43.0 in)	32 of 100 (Routine)
Guerrero (Smn)	Mexico	Record high maximum temperature	32.8 C (91.0 F)	31 of 100 (Routine)
Anucino	Russia	Record daily precipitation	87.1 mm (3.4 in)	31 of 100 (Routine)
Farmersville	United States	Record daily precipitation	60.2 mm (2.4 in)	31 of 100 (Routine)
Nalut	Libya	Record high minimum temperature	28.3 C (82.9 F)	30 of 100 (Routine)
Tecuantepec (Cfe)	Mexico	Record daily precipitation	153.9 mm (6.1 in)	30 of 100 (Routine)
Dixon Wwtp	United States	Record high maximum temperature	35.0 C (95.0 F)	30 of 100 (Routine)
El-Golea	Algeria	Record high minimum temperature	26.5 C (79.7 F)	29 of 100 (Routine)
Mo I Rana III	Norway	Record daily precipitation	37.0 mm (1.5 in)	29 of 100 (Routine)
Oak Ridge	United States	Record daily precipitation	49.3 mm (1.9 in)	29 of 100 (Routine)
New Stanton 1 SW	United States	Record daily precipitation	40.4 mm (1.6 in)	29 of 100 (Routine)
Rockwall	United States	Record daily precipitation	96.5 mm (3.8 in)	29 of 100 (Routine)
Stehekin 4 NW	United States	Record low maximum temperature	11.1 C (52.0 F)	29 of 100 (Routine)
Ganyu	China	Record daily precipitation	38.9 mm (1.5 in)	28 of 100 (Routine)
Sisimiut	Greenland [Denmark]	Record low maximum temperature	-5.5 C (22.1 F)	28 of 100 (Routine)
Portaceli	Mexico	Record high maximum temperature	38.9 C (102.0 F)	28 of 100 (Routine)
Cirian Grande	Mexico	Record low minimum temperature	8.9 C (48.0 F)	28 of 100 (Routine)

Counts by Type and Timescale

584 records

Records set or tied on 18 May 1999 by type: Highest daily maximum 132, Lowest daily maximum 82, Highest daily minimum 90, Lowest daily minimum 109, Heaviest daily rainfall 169, Deepest snow cover 2.

Records on 18 May 1999 by type
Record type	Records
Highest daily maximum	132
Lowest daily maximum	82
Highest daily minimum	90
Lowest daily minimum	109
Heaviest daily rainfall	169
Heaviest daily snowfall	0
Deepest snow cover	2

Records on 18 May 1999 by timescale: all-time 0, monthly 14, daily 570.

How Much Records Were Beaten By

446 broken records

Margins by which the 446 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 482.0. Ties are not counted.

Top 20 by Significance

18 May 1999

Top 20 records on 18 May 1999 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 May 1999	Elec, RU	monthly rain	46.0 mm (1.8 in)	15.1 mm (0.6 in)	34 years	51 of 100 (Notable)
18 May 1999	Muscoda, US	daily rain	58.9 mm (2.3 in)	38.6 mm (1.5 in)	18 years	51 of 100 (Notable)
18 May 1999	Ebano, MX	daily rain	52.8 mm (2.1 in)	50.5 mm (2.0 in)	36 years	50 of 100 (Notable)
18 May 1999	Ponyri, RU	daily rain	33.8 mm (1.3 in)	26.4 mm (1.0 in)	20 years	50 of 100 (Notable)
18 May 1999	Kenton, US	daily rain	39.4 mm (1.6 in)	17.3 mm (0.7 in)	56 years	45 of 100 (Notable)
18 May 1999	Cerralvo (Dge), MX	daily rain	77.0 mm (3.0 in)	65.8 mm (2.6 in)	32 years	44 of 100 (Notable)
18 May 1999	Lac Vieux Desert, US	daily rain	32.3 mm (1.3 in)	21.6 mm (0.9 in)	41 years	44 of 100 (Notable)
18 May 1999	Leirfjord, NO	daily rain	46.2 mm (1.8 in)	22.9 mm (0.9 in)	28 years	43 of 100 (Notable)
18 May 1999	Inza, RU	daily rain	30.5 mm (1.2 in)	11.0 mm (0.4 in)	56 years	43 of 100 (Notable)
18 May 1999	Ann Arbor U of Mich, US	daily rain	43.7 mm (1.7 in)	1.8 mm (0.07 in)	106 years	42 of 100 (Notable)
18 May 1999	Stambaugh 2SSE, US	daily rain	28.7 mm (1.1 in)	16.0 mm (0.6 in)	56 years	42 of 100 (Notable)
18 May 1999	Bergland Dam, US	daily rain	27.9 mm (1.1 in)	13.4 mm (0.5 in)	56 years	41 of 100 (Notable)
18 May 1999	Summit Lake, US	daily rain	39.9 mm (1.6 in)	27.2 mm (1.1 in)	32 years	41 of 100 (Notable)
18 May 1999	Misurata, LY	monthly high min	26.9 C (80.4 F)	1.0 C (1.8 F)	66 years	40 of 100 (Notable)
18 May 1999	Westfield 2 SSE, US	daily rain	30.5 mm (1.2 in)	15.8 mm (0.6 in)	40 years	40 of 100 (Notable)
18 May 1999	Benavides #2, US	daily rain	55.9 mm (2.2 in)	55.9 mm (2.2 in)	33 years	40 of 100 (Notable)
18 May 1999	Conconully, US	daily low max	11.1 C (52.0 F)	0.6 C (1.1 F)	96 years	40 of 100 (Notable)
18 May 1999	Hayward Rs, US	daily rain	44.5 mm (1.8 in)	20.1 mm (0.8 in)	33 years	40 of 100 (Notable)
18 May 1999	Drevja, NO	daily rain	33.2 mm (1.3 in)	13.2 mm (0.5 in)	28 years	39 of 100 (Notable)
18 May 1999	Ness City, US	daily low min	2.8 C (37.0 F)	0.5 C (0.9 F)	94 years	39 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

1796 to 1999

Records set or tied on this calendar date in each year from 1796 to 1999. 1999 had 584 records.

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

Records on 05-18 in each year
Year	Records
1796	1
1798	1
1802	2
1832	1
1833	1
1845	1
1847	1
1848	1
1855	1
1859	1
1861	2
1863	3
1864	1
1866	2
1868	2
1869	1
1870	1
1871	2
1872	1
1874	2
1877	4
1878	1
1879	1
1881	1
1883	2
1884	2
1885	1
1887	1
1888	4
1889	2
1891	1
1893	2
1894	4
1895	5
1896	2
1897	2
1898	1
1899	1
1900	13
1901	6
1902	9
1903	7
1904	11
1905	2
1906	24
1907	18
1908	5
1909	12
1910	50
1911	64
1912	5
1913	11
1914	45
1915	55
1916	74
1917	30
1918	42
1919	30
1920	26
1921	41
1922	33
1923	61
1924	92
1925	220
1926	133
1927	180
1928	160
1929	193
1930	475
1931	191
1932	460
1933	380
1934	390
1935	400
1936	282
1937	348
1938	382
1939	169
1940	315
1941	334
1942	421
1943	744
1944	496
1945	706
1946	651
1947	231
1948	426
1949	597
1950	473
1951	279
1952	493
1953	393
1954	498
1955	848
1956	795
1957	595
1958	334
1959	435
1960	404
1961	187
1962	1,199
1963	477
1964	329
1965	345
1966	438
1967	410
1968	817
1969	865
1970	703
1971	666
1972	499
1973	1,233
1974	1,097
1975	383
1976	733
1977	1,126
1978	1,090
1979	399
1980	614
1981	1,218
1982	452
1983	1,093
1984	717
1985	498
1986	1,131
1987	823
1988	1,154
1989	721
1990	753
1991	1,218
1992	921
1993	707
1994	1,015
1995	1,849
1996	1,767
1997	1,115
1998	1,060
1999	584
2000	922
2001	898
2002	1,833
2003	1,270
2004	847
2005	630
2006	1,493
2007	1,133
2008	999
2009	1,368
2010	894
2011	1,406
2012	523
2013	816
2014	609
2015	785
2016	597
2017	1,855
2018	557
2019	810
2020	706
2021	418
2022	711
2023	554
2024	551
2025	619
2026	1,131

Download the Data

Data for records on 1999-05-18: 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	444
100 to 200	0
200 to 300	0
300 to 400	0
400 to 500	2