Weather Records on 18 May 2021

418 weather records were set or tied worldwide on 18 May 2021. Highest significance: Napoleonville, US.

Key Facts for 18 May 2021

On 18 May 2021, 418 weather records were set or tied at long-record stations worldwide.
218 were record highs and 73 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 19 monthly and 399 daily.
Napoleonville set a daily record precipitation of 135.1 mm (5.3 in) on 18 May 2021.
Across 164 earlier years (1796 to 2026) the same calendar date averaged 443 records.

Record Map

418 stations

418 station records on 18 May 2021 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 May 2021: highest significance records shown on the map
Station	Country	Type	Value	Significance
Napoleonville	United States	Record daily precipitation	135.1 mm (5.3 in)	76 of 100 (Major)
Wray	United States	Record daily precipitation	82.0 mm (3.2 in)	75 of 100 (Major)
Donaldsonville 4 SW	United States	Record daily precipitation	200.4 mm (7.9 in)	75 of 100 (Major)
Zakatala	Azerbaijan	Record daily precipitation	99.6 mm (3.9 in)	59 of 100 (Notable)
Walsenburg 1 NW	United States	Record daily precipitation	78.7 mm (3.1 in)	58 of 100 (Notable)
Surat	India	Record daily precipitation	93.0 mm (3.7 in)	54 of 100 (Notable)
Buffalo Bill Dam	United States	Record high maximum temperature	34.4 C (93.9 F)	54 of 100 (Notable)
Tyler Pounds Fld	United States	Record daily precipitation	88.4 mm (3.5 in)	53 of 100 (Notable)
Bombay/Santacruz	India	Record daily precipitation	230.1 mm (9.1 in)	51 of 100 (Notable)
Laghouat	Algeria	Record high minimum temperature	23.5 C (74.3 F)	47 of 100 (Notable)
Baker	United States	Record daily precipitation	107.2 mm (4.2 in)	47 of 100 (Notable)
Kargopol	Russia	Record high maximum temperature	30.0 C (86.0 F)	45 of 100 (Notable)
Aydin	Turkey	Record daily precipitation	89.4 mm (3.5 in)	45 of 100 (Notable)
Gonzales	United States	Record daily precipitation	165.1 mm (6.5 in)	45 of 100 (Notable)
Moss Bluff	United States	Record daily precipitation	161.3 mm (6.4 in)	45 of 100 (Notable)
Porthill	United States	Record high minimum temperature	14.4 C (57.9 F)	44 of 100 (Notable)
Crowley 2 NE	United States	Record daily precipitation	102.9 mm (4.1 in)	44 of 100 (Notable)
Leland Bowman Lock	United States	Record daily precipitation	132.8 mm (5.2 in)	44 of 100 (Notable)
Crestone 2 SE	United States	Record daily precipitation	25.9 mm (1.0 in)	43 of 100 (Notable)
Nikolaevskoe	Russia	Record daily precipitation	29.0 mm (1.1 in)	42 of 100 (Notable)
Cabot	United States	Record daily precipitation	60.5 mm (2.4 in)	42 of 100 (Notable)
Baton Rouge Sherwood	United States	Record daily precipitation	205.2 mm (8.1 in)	42 of 100 (Notable)
Carencro	United States	Record daily precipitation	133.4 mm (5.3 in)	42 of 100 (Notable)
Sodankyla AWS	Finland	Record high minimum temperature	8.6 C (47.5 F)	41 of 100 (Notable)
Zametchino	Russia	Record high maximum temperature	32.8 C (91.0 F)	41 of 100 (Notable)
Damascus 2 NNE	United States	Record daily precipitation	56.4 mm (2.2 in)	41 of 100 (Notable)
Mt Adams Rs	United States	Record low minimum temperature	-5.6 C (21.9 F)	41 of 100 (Notable)
Dunhuang	China	Record daily precipitation	29.2 mm (1.1 in)	40 of 100 (Notable)
Mahabaleshwar	India	Record daily precipitation	27.9 mm (1.1 in)	40 of 100 (Notable)
Akron 4 E	United States	Record daily precipitation	28.7 mm (1.1 in)	40 of 100 (Notable)
Chinook	United States	Record high maximum temperature	31.7 C (89.1 F)	40 of 100 (Notable)
North Costilla	United States	Record daily precipitation	25.4 mm (1.0 in)	40 of 100 (Notable)
St. Petersburg	Russia	Record daily precipitation	33.0 mm (1.3 in)	39 of 100 (Notable)
Port Allen	United States	Record daily precipitation	116.1 mm (4.6 in)	39 of 100 (Notable)
Culebra #2	United States	Record daily precipitation	38.1 mm (1.5 in)	39 of 100 (Notable)
Mammoth Spring	United States	Record daily precipitation	31.5 mm (1.2 in)	38 of 100 (Notable)
Athens	United States	Record daily precipitation	53.1 mm (2.1 in)	38 of 100 (Notable)
Trinchera	United States	Record daily precipitation	30.5 mm (1.2 in)	38 of 100 (Notable)
Bikaner	India	Record low maximum temperature	31.0 C (87.8 F)	37 of 100 (Notable)
Mineral Wells AP	United States	Record daily precipitation	58.9 mm (2.3 in)	37 of 100 (Notable)
Kofu	Japan	Record high minimum temperature	21.1 C (70.0 F)	36 of 100 (Notable)
Albany	United States	Record daily precipitation	50.8 mm (2.0 in)	36 of 100 (Notable)
Abbeville	United States	Record daily precipitation	89.7 mm (3.5 in)	35 of 100 (Notable)
Greenville Muni AP	United States	Record high minimum temperature	10.6 C (51.1 F)	35 of 100 (Notable)
Cerro	United States	Record daily precipitation	28.4 mm (1.1 in)	35 of 100 (Notable)
Walsh 1 W	United States	Record daily precipitation	35.8 mm (1.4 in)	34 of 100 (Routine)
Hords Creek Dam	United States	Record daily precipitation	50.8 mm (2.0 in)	34 of 100 (Routine)
Albany	Australia	Record high minimum temperature	15.5 C (59.9 F)	33 of 100 (Routine)
Irozaki	Japan	Record high minimum temperature	20.1 C (68.2 F)	33 of 100 (Routine)
Atbasar	Kazakhstan	Record high maximum temperature	35.1 C (95.2 F)	33 of 100 (Routine)
Uralsk	Kazakhstan	Record high maximum temperature	36.0 C (96.8 F)	33 of 100 (Routine)
Pogranichnoe	Russia	Record high maximum temperature	26.3 C (79.3 F)	33 of 100 (Routine)
Victoria Rgnl AP	United States	Record daily precipitation	134.6 mm (5.3 in)	33 of 100 (Routine)
Surigao	Philippines	Record low maximum temperature	27.2 C (81.0 F)	32 of 100 (Routine)
Suphan Buri	Thailand	Record high minimum temperature	28.7 C (83.7 F)	32 of 100 (Routine)
Ashgabat	Turkmenistan	Record high maximum temperature	37.6 C (99.7 F)	32 of 100 (Routine)
Breckenridge	United States	Record daily precipitation	55.4 mm (2.2 in)	32 of 100 (Routine)
Monto Township	Australia	Record low minimum temperature	0.5 C (32.9 F)	31 of 100 (Routine)
Hinatuan	Philippines	Record daily precipitation	62.7 mm (2.5 in)	31 of 100 (Routine)
Sterlitamak	Russia	Record high maximum temperature	33.6 C (92.5 F)	31 of 100 (Routine)

Counts by Type and Timescale

418 records

Records set or tied on 18 May 2021 by type: Highest daily maximum 105, Lowest daily maximum 37, Highest daily minimum 113, Lowest daily minimum 36, Heaviest daily rainfall 126, Heaviest daily snowfall 1.

Records on 18 May 2021 by type
Record type	Records
Highest daily maximum	105
Lowest daily maximum	37
Highest daily minimum	113
Lowest daily minimum	36
Heaviest daily rainfall	126
Heaviest daily snowfall	1
Deepest snow cover	0

Records on 18 May 2021 by timescale: all-time 0, monthly 19, daily 399.

How Much Records Were Beaten By

372 broken records

Margins by which the 372 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 175.0. Ties are not counted.

Top 20 by Significance

18 May 2021

Top 20 records on 18 May 2021 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 May 2021	Napoleonville, US	daily rain	135.1 mm (5.3 in)	91.9 mm (3.6 in)	104 years	76 of 100 (Major)
18 May 2021	Wray, US	daily rain	82.0 mm (3.2 in)	58.6 mm (2.3 in)	86 years	75 of 100 (Major)
18 May 2021	Donaldsonville 4 SW, US	daily rain	200.4 mm (7.9 in)	102.1 mm (4.0 in)	84 years	75 of 100 (Major)
18 May 2021	Zakatala, AZ	daily rain	99.6 mm (3.9 in)	63.2 mm (2.5 in)	64 years	59 of 100 (Notable)
18 May 2021	Walsenburg 1 NW, US	monthly rain	78.7 mm (3.1 in)	27.9 mm (1.1 in)	26 years	58 of 100 (Notable)
18 May 2021	Surat, IN	daily rain	93.0 mm (3.7 in)	63.8 mm (2.5 in)	88 years	54 of 100 (Notable)
18 May 2021	Buffalo Bill Dam, US	monthly high max	34.4 C (93.9 F)	2.7 C (4.9 F)	101 years	54 of 100 (Notable)
18 May 2021	Tyler Pounds Fld, US	daily rain	88.4 mm (3.5 in)	27.4 mm (1.1 in)	132 years	53 of 100 (Notable)
18 May 2021	Bombay/Santacruz, IN	daily rain	230.1 mm (9.1 in)	175.0 mm (6.9 in)	16 years	51 of 100 (Notable)
18 May 2021	Laghouat, DZ	daily high min	23.5 C (74.3 F)	2.5 C (4.5 F)	108 years	47 of 100 (Notable)
18 May 2021	Baker, US	daily rain	107.2 mm (4.2 in)	83.8 mm (3.3 in)	27 years	47 of 100 (Notable)
18 May 2021	Kargopol, RU	daily high max	30.0 C (86.0 F)	3.4 C (6.1 F)	100 years	45 of 100 (Notable)
18 May 2021	Aydin, TR	daily rain	89.4 mm (3.5 in)	39.4 mm (1.6 in)	23 years	45 of 100 (Notable)
18 May 2021	Gonzales, US	daily rain	165.1 mm (6.5 in)	137.7 mm (5.4 in)	4 years	45 of 100 (Notable)
18 May 2021	Moss Bluff, US	daily rain	161.3 mm (6.4 in)	114.6 mm (4.5 in)	30 years	45 of 100 (Notable)
18 May 2021	Porthill, US	daily high min	14.4 C (57.9 F)	1.6 C (2.9 F)	125 years	44 of 100 (Notable)
18 May 2021	Crowley 2 NE, US	daily rain	102.9 mm (4.1 in)	61.0 mm (2.4 in)	43 years	44 of 100 (Notable)
18 May 2021	Leland Bowman Lock, US	daily rain	132.8 mm (5.2 in)	90.1 mm (3.5 in)	19 years	44 of 100 (Notable)
18 May 2021	Crestone 2 SE, US	daily rain	25.9 mm (1.0 in)	15.7 mm (0.6 in)	28 years	43 of 100 (Notable)
18 May 2021	Nikolaevskoe, RU	daily rain	29.0 mm (1.1 in)	11.9 mm (0.5 in)	34 years	42 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 2021

Records set or tied on this calendar date in each year from 1796 to 2021. 2021 had 418 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 2021-05-18: 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 25	345
25 to 50	11
50 to 75	8
75 to 100	4
100 to 125	2
125 to 150	1
150 to 175	1