Weather Records on 18 May 2000

922 weather records were set or tied worldwide on 18 May 2000. Highest significance: Oconomowoc Wwtp, US.

Key Facts for 18 May 2000

On 18 May 2000, 922 weather records were set or tied at long-record stations worldwide.
351 were record highs and 192 were record lows, counting maximum and minimum temperature.
By timescale, 7 were all-time records, 50 monthly and 865 daily.
Oconomowoc Wwtp set a daily record precipitation of 68.3 mm (2.7 in) on 18 May 2000.
Across 164 earlier years (1796 to 2026) the same calendar date averaged 440 records.

Record Map

922 stations

922 station records on 18 May 2000 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 May 2000: highest significance records shown on the map
Station	Country	Type	Value	Significance
Oconomowoc Wwtp	United States	Record daily precipitation	68.3 mm (2.7 in)	80 of 100 (Exceptional)
Wamsutter	United States	Record daily snowfall	30.5 cm (12.0 in)	80 of 100 (Exceptional)
Baraboo Wwtp	United States	Record daily precipitation	69.9 mm (2.8 in)	78 of 100 (Major)
Marion	United States	Record daily precipitation	69.9 mm (2.8 in)	77 of 100 (Major)
Watertown Wwtp	United States	Record daily precipitation	89.2 mm (3.5 in)	75 of 100 (Major)
Chugwater	United States	Record daily precipitation	78.5 mm (3.1 in)	75 of 100 (Major)
Sioux Ctr 2 SE	United States	Record daily precipitation	76.2 mm (3.0 in)	72 of 100 (Major)
Lake Mills Wwtp	United States	Record daily precipitation	53.3 mm (2.1 in)	69 of 100 (Major)
Hawarden	United States	Record daily precipitation	73.7 mm (2.9 in)	68 of 100 (Major)
Richland Ctr	United States	Record daily precipitation	93.5 mm (3.7 in)	68 of 100 (Major)
Albert Lea 3SE	United States	Record daily precipitation	90.9 mm (3.6 in)	66 of 100 (Major)
Dodgeville Wwtp	United States	Record daily precipitation	56.1 mm (2.2 in)	66 of 100 (Major)
Westby 3ENE	United States	Record daily precipitation	101.1 mm (4.0 in)	66 of 100 (Major)
Harrison	United States	Record daily precipitation	67.3 mm (2.6 in)	65 of 100 (Major)
Portage Wwtp	United States	Record daily precipitation	94.2 mm (3.7 in)	65 of 100 (Major)
Lansing	United States	Record daily precipitation	106.2 mm (4.2 in)	64 of 100 (Major)
Chilton	United States	Record daily precipitation	43.7 mm (1.7 in)	64 of 100 (Major)
Hay Springs	United States	Record daily precipitation	50.8 mm (2.0 in)	63 of 100 (Major)
Archer	United States	Record daily precipitation	50.3 mm (2.0 in)	63 of 100 (Major)
Alton	United States	Record daily precipitation	53.6 mm (2.1 in)	62 of 100 (Major)
Caledonia	United States	Record daily precipitation	100.6 mm (4.0 in)	62 of 100 (Major)
Ellsworth 1E	United States	Record daily precipitation	41.9 mm (1.6 in)	62 of 100 (Major)
Wamsutter	United States	Record daily precipitation	38.1 mm (1.5 in)	62 of 100 (Major)
Harmony	United States	Record daily precipitation	94.7 mm (3.7 in)	60 of 100 (Major)
Waukesha Wwtp	United States	Record daily precipitation	51.1 mm (2.0 in)	60 of 100 (Major)
Milford 4 NW	United States	Record daily precipitation	62.5 mm (2.5 in)	59 of 100 (Notable)
Adrian 2 NNE	United States	Record daily precipitation	76.2 mm (3.0 in)	59 of 100 (Notable)
Lanesboro	United States	Record daily precipitation	127.3 mm (5.0 in)	59 of 100 (Notable)
Merriman	United States	Record daily precipitation	62.2 mm (2.4 in)	59 of 100 (Notable)
Holland Wtp	United States	Record daily precipitation	73.9 mm (2.9 in)	57 of 100 (Notable)
La Crescent Dam 7	United States	Record daily precipitation	81.3 mm (3.2 in)	57 of 100 (Notable)
Spring Grove	United States	Record daily precipitation	94.5 mm (3.7 in)	57 of 100 (Notable)
Niobrara	United States	Record daily precipitation	90.7 mm (3.6 in)	57 of 100 (Notable)
Sybille Rsch Unit	United States	Record daily precipitation	81.5 mm (3.2 in)	57 of 100 (Notable)
Hay Springs 12 S	United States	Record daily precipitation	61.7 mm (2.4 in)	56 of 100 (Notable)
Wayne	United States	Record daily precipitation	67.3 mm (2.6 in)	56 of 100 (Notable)
Manitowoc	United States	Record daily precipitation	43.2 mm (1.7 in)	56 of 100 (Notable)
Hartington	United States	Record daily precipitation	68.8 mm (2.7 in)	54 of 100 (Notable)
Oakdale	United States	Record daily precipitation	83.1 mm (3.3 in)	54 of 100 (Notable)
St Peter	United States	Record daily precipitation	106.7 mm (4.2 in)	53 of 100 (Notable)
Lincang	China	Record daily precipitation	58.7 mm (2.3 in)	52 of 100 (Notable)
Preston	United States	Record daily precipitation	119.4 mm (4.7 in)	52 of 100 (Notable)
Mission 14 S	United States	Record daily precipitation	50.8 mm (2.0 in)	52 of 100 (Notable)
Prairie du Sac 2 N	United States	Record daily precipitation	57.2 mm (2.3 in)	52 of 100 (Notable)
Burgess Junction	United States	Record daily snowfall	38.1 cm (15.0 in)	52 of 100 (Notable)
Winona	United States	Record daily precipitation	40.4 mm (1.6 in)	51 of 100 (Notable)
Dalton	United States	Record daily precipitation	60.5 mm (2.4 in)	51 of 100 (Notable)
Germantown Wastewater Utility	United States	Record daily precipitation	90.2 mm (3.6 in)	51 of 100 (Notable)
Port Washington	United States	Record daily precipitation	31.8 mm (1.3 in)	51 of 100 (Notable)
Prairie du Chien	United States	Record daily precipitation	69.9 mm (2.8 in)	51 of 100 (Notable)
Sibley	United States	Record daily precipitation	73.9 mm (2.9 in)	50 of 100 (Notable)
Ellsworth 2W	United States	Record daily precipitation	56.6 mm (2.2 in)	50 of 100 (Notable)
Wood	United States	Record daily precipitation	42.9 mm (1.7 in)	50 of 100 (Notable)
Plymouth Wwtp	United States	Record daily precipitation	39.4 mm (1.6 in)	50 of 100 (Notable)
Racine Wwtp	United States	Record daily precipitation	65.5 mm (2.6 in)	50 of 100 (Notable)
Ripon 5 NE	United States	Record daily precipitation	50.3 mm (2.0 in)	50 of 100 (Notable)
Genoa Dam 8	United States	Record daily precipitation	100.6 mm (4.0 in)	49 of 100 (Notable)
Egersund	Norway	Record daily precipitation	41.7 mm (1.6 in)	48 of 100 (Notable)
Decorah	United States	Record daily precipitation	39.4 mm (1.6 in)	48 of 100 (Notable)
Manistee 3SE	United States	Record daily precipitation	28.4 mm (1.1 in)	48 of 100 (Notable)

Counts by Type and Timescale

922 records

Records set or tied on 18 May 2000 by type: Highest daily maximum 102, Lowest daily maximum 77, Highest daily minimum 249, Lowest daily minimum 115, Heaviest daily rainfall 368, Heaviest daily snowfall 10, Deepest snow cover 1.

Records on 18 May 2000 by type
Record type	Records
Highest daily maximum	102
Lowest daily maximum	77
Highest daily minimum	249
Lowest daily minimum	115
Heaviest daily rainfall	368
Heaviest daily snowfall	10
Deepest snow cover	1

Records on 18 May 2000 by timescale: all-time 7, monthly 50, daily 865.

How Much Records Were Beaten By

725 broken records

Margins by which the 725 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

18 May 2000

Top 20 records on 18 May 2000 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 May 2000	Oconomowoc Wwtp, US	daily rain	68.3 mm (2.7 in)	41.4 mm (1.6 in)	105 years	80 of 100 (Exceptional)
18 May 2000	Wamsutter, US	monthly snowfall	30.5 cm (12.0 in)	20.3 cm (8.0 in)	67 years	80 of 100 (Exceptional)
18 May 2000	Baraboo Wwtp, US	daily rain	69.9 mm (2.8 in)	37.4 mm (1.5 in)	105 years	78 of 100 (Major)
18 May 2000	Marion, US	daily rain	69.9 mm (2.8 in)	51.6 mm (2.0 in)	92 years	77 of 100 (Major)
18 May 2000	Watertown Wwtp, US	monthly rain	89.2 mm (3.5 in)	22.1 mm (0.9 in)	101 years	75 of 100 (Major)
18 May 2000	Chugwater, US	daily rain	78.5 mm (3.1 in)	54.4 mm (2.1 in)	85 years	75 of 100 (Major)
18 May 2000	Sioux Ctr 2 SE, US	daily rain	76.2 mm (3.0 in)	45.0 mm (1.8 in)	81 years	72 of 100 (Major)
18 May 2000	Lake Mills Wwtp, US	daily rain	53.3 mm (2.1 in)	29.7 mm (1.2 in)	101 years	69 of 100 (Major)
18 May 2000	Hawarden, US	daily rain	73.7 mm (2.9 in)	44.5 mm (1.8 in)	72 years	68 of 100 (Major)
18 May 2000	Richland Ctr, US	monthly rain	93.5 mm (3.7 in)	30.8 mm (1.2 in)	66 years	68 of 100 (Major)
18 May 2000	Albert Lea 3SE, US	daily rain	90.9 mm (3.6 in)	55.3 mm (2.2 in)	54 years	66 of 100 (Major)
18 May 2000	Dodgeville Wwtp, US	daily rain	56.1 mm (2.2 in)	30.7 mm (1.2 in)	98 years	66 of 100 (Major)
18 May 2000	Westby 3ENE, US	monthly rain	101.1 mm (4.0 in)	49.8 mm (2.0 in)	40 years	66 of 100 (Major)
18 May 2000	Harrison, US	daily rain	67.3 mm (2.6 in)	34.5 mm (1.4 in)	86 years	65 of 100 (Major)
18 May 2000	Portage Wwtp, US	monthly rain	94.2 mm (3.7 in)	15.5 mm (0.6 in)	104 years	65 of 100 (Major)
18 May 2000	Lansing, US	monthly rain	106.2 mm (4.2 in)	22.6 mm (0.9 in)	82 years	64 of 100 (Major)
18 May 2000	Chilton, US	daily rain	43.7 mm (1.7 in)	25.9 mm (1.0 in)	105 years	64 of 100 (Major)
18 May 2000	Hay Springs, US	daily rain	50.8 mm (2.0 in)	33.0 mm (1.3 in)	65 years	63 of 100 (Major)
18 May 2000	Archer, US	daily rain	50.3 mm (2.0 in)	27.7 mm (1.1 in)	79 years	63 of 100 (Major)
18 May 2000	Alton, US	daily rain	53.6 mm (2.1 in)	29.7 mm (1.2 in)	81 years	62 of 100 (Major)

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 2000

Records set or tied on this calendar date in each year from 1796 to 2000. 2000 had 922 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 2000-05-18: 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 2026-10-16 (16 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	711
50 to 100	11
100 to 150	0
150 to 200	1
200 to 250	1
250 to 300	0
300 to 350	0
350 to 400	1