Weather Records on 18 May 1991

1,218 weather records were set or tied worldwide on 18 May 1991. Highest significance: Savannah 6 SW, US.

Key Facts for 18 May 1991

On 18 May 1991, 1,218 weather records were set or tied at long-record stations worldwide.
405 were record highs and 483 were record lows, counting maximum and minimum temperature.
By timescale, 4 were all-time records, 26 monthly and 1,188 daily.
Savannah 6 SW set a daily record precipitation of 72.9 mm (2.9 in) on 18 May 1991.
Across 164 earlier years (1796 to 2026) the same calendar date averaged 438 records.

Record Map

1,218 stations

1,218 station records on 18 May 1991 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 May 1991: highest significance records shown on the map
Station	Country	Type	Value	Significance
Savannah 6 SW	United States	Record daily precipitation	72.9 mm (2.9 in)	67 of 100 (Major)
Wien	Austria	Record daily precipitation	46.3 mm (1.8 in)	65 of 100 (Major)
Alturas	United States	Record daily snowfall	10.2 cm (4.0 in)	61 of 100 (Major)
Leavenworth 3 S	United States	Record daily precipitation	42.7 mm (1.7 in)	58 of 100 (Notable)
Ft Bidwell	United States	Record daily snowfall	10.2 cm (4.0 in)	57 of 100 (Notable)
Hart Mtn Refuge	United States	Record daily precipitation	49.5 mm (1.9 in)	57 of 100 (Notable)
Jess Valley	United States	Record daily snowfall	30.5 cm (12.0 in)	56 of 100 (Notable)
Jess Valley	United States	Record daily precipitation	42.4 mm (1.7 in)	54 of 100 (Notable)
Dorena	United States	Record daily precipitation	40.6 mm (1.6 in)	53 of 100 (Notable)
Pilot Rock 1 SE	United States	Record daily precipitation	26.9 mm (1.1 in)	52 of 100 (Notable)
Lewiston AP	United States	Record daily precipitation	33.5 mm (1.3 in)	52 of 100 (Notable)
New Hampton	United States	Record daily precipitation	56.9 mm (2.2 in)	51 of 100 (Notable)
Eaton	United States	Record daily precipitation	108.7 mm (4.3 in)	51 of 100 (Notable)
Del Bonita	United States	Record daily precipitation	38.1 mm (1.5 in)	50 of 100 (Notable)
Chief Joseph Dam	United States	Record daily precipitation	27.4 mm (1.1 in)	49 of 100 (Notable)
Morro Danta (Pedro Canario)	Brazil	Record daily precipitation	50.2 mm (2.0 in)	48 of 100 (Notable)
Durham	United States	Record high minimum temperature	22.2 C (72.0 F)	48 of 100 (Notable)
San Luis San Pedro	Mexico	Record high maximum temperature	40.6 C (105.1 F)	47 of 100 (Notable)
Dayton Mcd	United States	Record daily precipitation	99.1 mm (3.9 in)	47 of 100 (Notable)
Hart Mtn Refuge	United States	Record daily snowfall	45.7 cm (18.0 in)	47 of 100 (Notable)
Klamath Falls 2 SSW	United States	Record daily snowfall	5.1 cm (2.0 in)	45 of 100 (Notable)
Superior	United States	Record daily precipitation	25.1 mm (1.0 in)	45 of 100 (Notable)
Torrington	United States	Record daily precipitation	61.5 mm (2.4 in)	44 of 100 (Notable)
Xenia 6 SSE	United States	Record daily precipitation	73.4 mm (2.9 in)	44 of 100 (Notable)
Dialville 2 W	United States	Record daily precipitation	97.3 mm (3.8 in)	44 of 100 (Notable)
Pendzhikent	Tajikistan	Record daily precipitation	29.7 mm (1.2 in)	43 of 100 (Notable)
Jomo Kenyatta Intl	Kenya	Record daily precipitation	78.9 mm (3.1 in)	42 of 100 (Notable)
Beowawe	United States	Record low maximum temperature	6.7 C (44.1 F)	42 of 100 (Notable)
Danner	United States	Record daily precipitation	27.7 mm (1.1 in)	42 of 100 (Notable)
Osage	United States	Record daily precipitation	42.4 mm (1.7 in)	41 of 100 (Notable)
Thompson Falls Ph	United States	Record daily precipitation	32.3 mm (1.3 in)	41 of 100 (Notable)
Bend	United States	Record low maximum temperature	5.0 C (41.0 F)	41 of 100 (Notable)
Howard Prairie Dam	United States	Record daily snowfall	12.2 cm (4.8 in)	41 of 100 (Notable)
Kremsmuenster	Austria	Record low maximum temperature	7.9 C (46.2 F)	40 of 100 (Notable)
Cedarville	United States	Record low maximum temperature	3.9 C (39.0 F)	40 of 100 (Notable)
Mt Shasta	United States	Record daily snowfall	12.2 cm (4.8 in)	40 of 100 (Notable)
Yosemite Park HQ	United States	Record low maximum temperature	7.8 C (46.0 F)	40 of 100 (Notable)
Henderson 2 NNW	United States	Record daily precipitation	32.5 mm (1.3 in)	40 of 100 (Notable)
Stayton	United States	Record daily precipitation	35.1 mm (1.4 in)	40 of 100 (Notable)
Sonnblick	Austria	Record low maximum temperature	-9.3 C (15.3 F)	39 of 100 (Notable)
Col du Grand St-Bernard	Switzerland	Record low maximum temperature	-3.7 C (25.3 F)	39 of 100 (Notable)
Mt Sterling	United States	Record daily precipitation	50.8 mm (2.0 in)	39 of 100 (Notable)
Ashland	United States	Record low maximum temperature	8.3 C (46.9 F)	39 of 100 (Notable)
Leaburg 1 SW	United States	Record daily precipitation	41.7 mm (1.6 in)	39 of 100 (Notable)
Dwtn Charleston	United States	Record high minimum temperature	25.0 C (77.0 F)	39 of 100 (Notable)
Mt Sterling	United States	Record high minimum temperature	20.6 C (69.1 F)	38 of 100 (Notable)
Gholson 8 W	United States	Record daily precipitation	55.9 mm (2.2 in)	38 of 100 (Notable)
Kalispell Glacier AP	United States	Record high minimum temperature	10.6 C (51.1 F)	38 of 100 (Notable)
The Dalles	United States	Record low maximum temperature	13.9 C (57.0 F)	38 of 100 (Notable)
Cheraw	United States	Record high minimum temperature	21.1 C (70.0 F)	38 of 100 (Notable)
Graz	Austria	Record low maximum temperature	9.2 C (48.6 F)	37 of 100 (Notable)
Presa Centenario	Mexico	Record high minimum temperature	20.0 C (68.0 F)	37 of 100 (Notable)
Ciudad Aleman	Mexico	Record daily precipitation	73.4 mm (2.9 in)	37 of 100 (Notable)
Nevada City	United States	Record low maximum temperature	7.2 C (45.0 F)	37 of 100 (Notable)
Mayo	United States	Record daily precipitation	67.6 mm (2.7 in)	37 of 100 (Notable)
Hampton	United States	Record daily precipitation	61.5 mm (2.4 in)	37 of 100 (Notable)
New Hampton	United States	Record low maximum temperature	10.0 C (50.0 F)	37 of 100 (Notable)
Eldon	United States	Record high minimum temperature	20.6 C (69.1 F)	37 of 100 (Notable)
Cascadia	United States	Record daily precipitation	29.7 mm (1.2 in)	37 of 100 (Notable)
Holley	United States	Record daily precipitation	29.0 mm (1.1 in)	37 of 100 (Notable)

Counts by Type and Timescale

1,218 records

Records set or tied on 18 May 1991 by type: Highest daily maximum 120, Lowest daily maximum 284, Highest daily minimum 285, Lowest daily minimum 199, Heaviest daily rainfall 293, Heaviest daily snowfall 26, Deepest snow cover 11.

Records on 18 May 1991 by type
Record type	Records
Highest daily maximum	120
Lowest daily maximum	284
Highest daily minimum	285
Lowest daily minimum	199
Heaviest daily rainfall	293
Heaviest daily snowfall	26
Deepest snow cover	11

Records on 18 May 1991 by timescale: all-time 4, monthly 26, daily 1,188.

How Much Records Were Beaten By

969 broken records

Margins by which the 969 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 305.0. Ties are not counted.

Top 20 by Significance

18 May 1991

Top 20 records on 18 May 1991 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 May 1991	Savannah 6 SW, US	daily rain	72.9 mm (2.9 in)	47.5 mm (1.9 in)	90 years	67 of 100 (Major)
18 May 1991	Wien, AT	daily rain	46.3 mm (1.8 in)	25.9 mm (1.0 in)	76 years	65 of 100 (Major)
18 May 1991	Alturas, US	daily snowfall	10.2 cm (4.0 in)	9.9 cm (3.9 in)	73 years	61 of 100 (Major)
18 May 1991	Leavenworth 3 S, US	monthly rain	42.7 mm (1.7 in)	9.9 mm (0.39 in)	70 years	58 of 100 (Notable)
18 May 1991	Ft Bidwell, US	daily snowfall	10.2 cm (4.0 in)	10.2 cm (4.0 in)	78 years	57 of 100 (Notable)
18 May 1991	Hart Mtn Refuge, US	daily rain	49.5 mm (1.9 in)	38.3 mm (1.5 in)	42 years	57 of 100 (Notable)
18 May 1991	Jess Valley, US	daily snowfall	30.5 cm (12.0 in)	30.5 cm (12.0 in)	41 years	56 of 100 (Notable)
18 May 1991	Jess Valley, US	daily rain	42.4 mm (1.7 in)	29.2 mm (1.1 in)	33 years	54 of 100 (Notable)
18 May 1991	Dorena, US	daily rain	40.6 mm (1.6 in)	29.7 mm (1.2 in)	30 years	53 of 100 (Notable)
18 May 1991	Pilot Rock 1 SE, US	daily rain	26.9 mm (1.1 in)	15.2 mm (0.6 in)	33 years	52 of 100 (Notable)
18 May 1991	Lewiston AP, US	daily rain	33.5 mm (1.3 in)	25.6 mm (1.0 in)	28 years	52 of 100 (Notable)
18 May 1991	New Hampton, US	daily rain	56.9 mm (2.2 in)	26.4 mm (1.0 in)	69 years	51 of 100 (Notable)
18 May 1991	Eaton, US	all-time rain	108.7 mm (4.3 in)	15.2 mm (0.6 in)	39 years	51 of 100 (Notable)
18 May 1991	Del Bonita, US	daily rain	38.1 mm (1.5 in)	30.5 mm (1.2 in)	32 years	50 of 100 (Notable)
18 May 1991	Chief Joseph Dam, US	daily rain	27.4 mm (1.1 in)	21.6 mm (0.9 in)	16 years	49 of 100 (Notable)
18 May 1991	Morro Danta (Pedro Canario), BR	daily rain	50.2 mm (2.0 in)	42.6 mm (1.7 in)	13 years	48 of 100 (Notable)
18 May 1991	Durham, US	monthly high min	22.2 C (72.0 F)	1.1 C (2.0 F)	92 years	48 of 100 (Notable)
18 May 1991	San Luis San Pedro, MX	daily high max	40.6 C (105.1 F)	5.6 C (10.1 F)	28 years	47 of 100 (Notable)
18 May 1991	Dayton Mcd, US	monthly rain	99.1 mm (3.9 in)	23.2 mm (0.9 in)	22 years	47 of 100 (Notable)
18 May 1991	Hart Mtn Refuge, US	all-time snowfall	45.7 cm (18.0 in)	5.1 cm (2.0 in)	48 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

1796 to 1991

Records set or tied on this calendar date in each year from 1796 to 1991. 1991 had 1,218 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 1991-05-18: 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 50	945
50 to 100	15
100 to 150	6
150 to 200	2
200 to 250	0
250 to 300	0
300 to 350	1