Weather Records on 21 May 2008

740 weather records were set or tied worldwide on 21 May 2008. Highest significance: Roma Ciampino, IT.

Key Facts for 21 May 2008

On 21 May 2008, 740 weather records were set or tied at long-record stations worldwide.
389 were record highs and 230 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 21 monthly and 717 daily.
Roma Ciampino set a daily record precipitation of 47.0 mm (1.9 in) on 21 May 2008.
Across 156 earlier years (1793 to 2026) the same calendar date averaged 459 records.

Record Map

740 stations

740 station records on 21 May 2008 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 May 2008: highest significance records shown on the map
Station	Country	Type	Value	Significance
Roma Ciampino	Italy	Record daily precipitation	47.0 mm (1.9 in)	60 of 100 (Major)
Hebron	United States	Record snow depth	48.3 cm (19.0 in)	57 of 100 (Notable)
Suttsu	Japan	Record daily precipitation	61.0 mm (2.4 in)	56 of 100 (Notable)
Joquicingo	Mexico	Record daily precipitation	63.0 mm (2.5 in)	54 of 100 (Notable)
Evanston 1 E	United States	Record daily snowfall	5.1 cm (2.0 in)	50 of 100 (Notable)
Tres Piedras	United States	Record high minimum temperature	11.7 C (53.1 F)	49 of 100 (Notable)
Sybille Rsch Unit	United States	Record daily precipitation	61.0 mm (2.4 in)	48 of 100 (Notable)
Ejido de Llano Grande	Mexico	Record daily precipitation	34.8 mm (1.4 in)	47 of 100 (Notable)
Yajlju	Russia	Record daily precipitation	55.5 mm (2.2 in)	47 of 100 (Notable)
Madrid/Torrejon	Spain	Record daily precipitation	25.7 mm (1.0 in)	46 of 100 (Notable)
Jesus del Monte	Mexico	Record high minimum temperature	20.6 C (69.1 F)	45 of 100 (Notable)
Dayton 1 WSW	United States	Record low maximum temperature	6.1 C (43.0 F)	43 of 100 (Notable)
Magadan	Russia	Record daily precipitation	31.2 mm (1.2 in)	42 of 100 (Notable)
Millport 4 NE	United States	Record low maximum temperature	10.6 C (51.1 F)	42 of 100 (Notable)
New Delhi/Safdarjun	India	Record daily precipitation	37.1 mm (1.5 in)	40 of 100 (Notable)
Freehold-Marlboro	United States	Record low maximum temperature	11.7 C (53.1 F)	40 of 100 (Notable)
Imperial Beach Ream Fld NAS	United States	Record high maximum temperature	27.8 C (82.0 F)	40 of 100 (Notable)
New Delhi/Safdarjun	India	Record low maximum temperature	25.2 C (77.4 F)	39 of 100 (Notable)
Sitiawan	Malaysia	Record daily precipitation	44.2 mm (1.7 in)	39 of 100 (Notable)
Khorog	Tajikistan	Record high maximum temperature	30.2 C (86.4 F)	39 of 100 (Notable)
Espanola	United States	Record high minimum temperature	15.6 C (60.1 F)	39 of 100 (Notable)
Hagansport	United States	Record daily precipitation	33.0 mm (1.3 in)	39 of 100 (Notable)
Fairview 8N	United States	Record daily snowfall	13.7 cm (5.4 in)	39 of 100 (Notable)
Poretta	France	Record daily precipitation	39.1 mm (1.5 in)	38 of 100 (Notable)
McGill	United States	Record high maximum temperature	30.6 C (87.1 F)	38 of 100 (Notable)
Yoder 5 W	United States	Record high minimum temperature	17.2 C (63.0 F)	38 of 100 (Notable)
Columbus	United States	Record high minimum temperature	23.9 C (75.0 F)	38 of 100 (Notable)
Sapporo	Japan	Record daily precipitation	35.6 mm (1.4 in)	37 of 100 (Notable)
Dos Patrias	Mexico	Record low maximum temperature	23.9 C (75.0 F)	37 of 100 (Notable)
Mys Alevina	Russia	Record daily precipitation	43.9 mm (1.7 in)	37 of 100 (Notable)
Holton	United States	Record daily precipitation	55.4 mm (2.2 in)	37 of 100 (Notable)
Whitefish Pt	United States	Record low maximum temperature	4.4 C (39.9 F)	37 of 100 (Notable)
Mountainair	United States	Record high minimum temperature	13.3 C (55.9 F)	37 of 100 (Notable)
Government Camp	United States	Record daily precipitation	46.2 mm (1.8 in)	37 of 100 (Notable)
Heber	United States	Record high maximum temperature	30.6 C (87.1 F)	37 of 100 (Notable)
Borinquen AP	Puerto Rico [United States]	Record daily precipitation	61.7 mm (2.4 in)	36 of 100 (Notable)
Hermit 8 SE	United States	Record high maximum temperature	24.4 C (75.9 F)	36 of 100 (Notable)
Ixcamilpa (Cfe)	Mexico	Record low maximum temperature	26.7 C (80.1 F)	35 of 100 (Notable)
Estancia 4N	United States	Record high minimum temperature	11.1 C (52.0 F)	35 of 100 (Notable)
Jornada Exp Range	United States	Record high maximum temperature	37.8 C (100.0 F)	35 of 100 (Notable)
Snake Creek Powerhouse	United States	Record low maximum temperature	8.9 C (48.0 F)	35 of 100 (Notable)
Atotonilco	Mexico	Record low maximum temperature	15.6 C (60.1 F)	34 of 100 (Routine)
Perote	Mexico	Record high maximum temperature	37.8 C (100.0 F)	34 of 100 (Routine)
Zion Np	United States	Record high maximum temperature	36.7 C (98.1 F)	34 of 100 (Routine)
Cody 21 SW	United States	Record daily precipitation	29.2 mm (1.1 in)	34 of 100 (Routine)
Crandall Creek	United States	Record daily precipitation	36.3 mm (1.4 in)	34 of 100 (Routine)
Calera	Mexico	Record high minimum temperature	18.9 C (66.0 F)	33 of 100 (Routine)
Montezuma Castle Nm	United States	Record high minimum temperature	17.2 C (63.0 F)	33 of 100 (Routine)
Searchlight	United States	Record high maximum temperature	36.1 C (97.0 F)	33 of 100 (Routine)
Garfield	United States	Record daily precipitation	30.5 mm (1.2 in)	33 of 100 (Routine)
Manila	United States	Record high maximum temperature	28.3 C (82.9 F)	33 of 100 (Routine)
Potrerillos	Mexico	Record low minimum temperature	8.3 C (46.9 F)	32 of 100 (Routine)
Seaside	United States	Record low maximum temperature	11.1 C (52.0 F)	32 of 100 (Routine)
Three Lynx	United States	Record daily precipitation	26.7 mm (1.1 in)	32 of 100 (Routine)
Daly Waters AWS	Australia	Record low minimum temperature	7.3 C (45.1 F)	31 of 100 (Routine)
Cape Bruny Lighthouse	Australia	Record low minimum temperature	-0.5 C (31.1 F)	31 of 100 (Routine)
Nellore	India	Record high maximum temperature	47.6 C (117.7 F)	31 of 100 (Routine)
Calera	Mexico	Record high maximum temperature	45.6 C (114.1 F)	31 of 100 (Routine)
Laveen 3 SSE	United States	Record high minimum temperature	27.8 C (82.0 F)	30 of 100 (Routine)
Tooele	United States	Record high maximum temperature	30.6 C (87.1 F)	30 of 100 (Routine)

Counts by Type and Timescale

740 records

Records set or tied on 21 May 2008 by type: Highest daily maximum 202, Lowest daily maximum 130, Highest daily minimum 187, Lowest daily minimum 100, Heaviest daily rainfall 112, Heaviest daily snowfall 4, Deepest snow cover 5.

Records on 21 May 2008 by type
Record type	Records
Highest daily maximum	202
Lowest daily maximum	130
Highest daily minimum	187
Lowest daily minimum	100
Heaviest daily rainfall	112
Heaviest daily snowfall	4
Deepest snow cover	5

Records on 21 May 2008 by timescale: all-time 2, monthly 21, daily 717.

How Much Records Were Beaten By

499 broken records

Margins by which the 499 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 483.0. Ties are not counted.

Top 20 by Significance

21 May 2008

Top 20 records on 21 May 2008 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 May 2008	Roma Ciampino, IT	daily rain	47.0 mm (1.9 in)	30.4 mm (1.2 in)	56 years	60 of 100 (Major)
21 May 2008	Hebron, US	daily snow depth	48.3 cm (19.0 in)	48.3 cm (19.0 in)	44 years	57 of 100 (Notable)
21 May 2008	Suttsu, JP	daily rain	61.0 mm (2.4 in)	37.5 mm (1.5 in)	38 years	56 of 100 (Notable)
21 May 2008	Joquicingo, MX	daily rain	63.0 mm (2.5 in)	26.7 mm (1.1 in)	44 years	54 of 100 (Notable)
21 May 2008	Evanston 1 E, US	daily snowfall	5.1 cm (2.0 in)	5.1 cm (2.0 in)	114 years	50 of 100 (Notable)
21 May 2008	Tres Piedras, US	monthly high min	11.7 C (53.1 F)	0.6 C (1.1 F)	95 years	49 of 100 (Notable)
21 May 2008	Sybille Rsch Unit, US	daily rain	61.0 mm (2.4 in)	49.3 mm (1.9 in)	16 years	48 of 100 (Notable)
21 May 2008	Ejido de Llano Grande, MX	daily rain	34.8 mm (1.4 in)	20.3 mm (0.8 in)	40 years	47 of 100 (Notable)
21 May 2008	Yajlju, RU	monthly rain	55.5 mm (2.2 in)	6.9 mm (0.27 in)	73 years	47 of 100 (Notable)
21 May 2008	Madrid/Torrejon, ES	daily rain	25.7 mm (1.0 in)	20.3 mm (0.8 in)	30 years	46 of 100 (Notable)
21 May 2008	Jesus del Monte, MX	daily high min	20.6 C (69.1 F)	3.4 C (6.1 F)	72 years	45 of 100 (Notable)
21 May 2008	Dayton 1 WSW, US	daily low max	6.1 C (43.0 F)	3.3 C (5.9 F)	90 years	43 of 100 (Notable)
21 May 2008	Magadan, RU	daily rain	31.2 mm (1.2 in)	16.3 mm (0.6 in)	27 years	42 of 100 (Notable)
21 May 2008	Millport 4 NE, US	daily low max	10.6 C (51.1 F)	1.6 C (2.9 F)	101 years	42 of 100 (Notable)
21 May 2008	New Delhi/Safdarjun, IN	daily rain	37.1 mm (1.5 in)	26.2 mm (1.0 in)	2 years	40 of 100 (Notable)
21 May 2008	Freehold-Marlboro, US	daily low max	11.7 C (53.1 F)	0.5 C (0.9 F)	113 years	40 of 100 (Notable)
21 May 2008	Imperial Beach Ream Fld NAS, US	daily high max	27.8 C (82.0 F)	5.0 C (9.0 F)	29 years	40 of 100 (Notable)
21 May 2008	New Delhi/Safdarjun, IN	daily low max	25.2 C (77.4 F)	8.7 C (15.7 F)	26 years	39 of 100 (Notable)
21 May 2008	Sitiawan, MY	daily rain	44.2 mm (1.7 in)	35.3 mm (1.4 in)	45 years	39 of 100 (Notable)
21 May 2008	Khorog, TJ	daily high max	30.2 C (86.4 F)	1.2 C (2.2 F)	91 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

1793 to 2008

Records set or tied on this calendar date in each year from 1793 to 2008. 2008 had 740 records.

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

Records on 05-21 in each year
Year	Records
1793	1
1795	1
1811	1
1837	2
1842	1
1847	2
1854	1
1857	1
1858	1
1865	1
1866	1
1870	2
1875	1
1876	1
1880	2
1882	1
1885	1
1886	2
1887	3
1889	5
1890	3
1891	6
1892	1
1893	1
1894	4
1895	4
1896	5
1897	2
1898	1
1899	5
1900	1
1901	3
1902	4
1903	26
1904	8
1905	7
1906	12
1907	36
1908	13
1909	13
1910	14
1911	87
1912	24
1913	13
1914	26
1915	24
1916	13
1917	76
1918	51
1919	170
1920	39
1921	158
1922	39
1923	125
1924	148
1925	250
1926	221
1927	207
1928	173
1929	247
1930	133
1931	488
1932	343
1933	290
1934	590
1935	190
1936	328
1937	227
1938	348
1939	355
1940	456
1941	525
1942	482
1943	463
1944	310
1945	515
1946	324
1947	485
1948	312
1949	593
1950	403
1951	271
1952	385
1953	501
1954	961
1955	507
1956	409
1957	709
1958	511
1959	684
1960	615
1961	306
1962	553
1963	598
1964	788
1965	238
1966	296
1967	1,022
1968	549
1969	832
1970	449
1971	536
1972	557
1973	493
1974	847
1975	1,160
1976	393
1977	756
1978	575
1979	787
1980	857
1981	1,550
1982	599
1983	1,106
1984	950
1985	610
1986	908
1987	1,242
1988	819
1989	671
1990	947
1991	1,065
1992	1,143
1993	1,197
1994	656
1995	749
1996	1,461
1997	953
1998	1,200
1999	544
2000	897
2001	1,187
2002	2,048
2003	807
2004	898
2005	1,020
2006	810
2007	894
2008	740
2009	1,315
2010	962
2011	959
2012	848
2013	884
2014	522
2015	956
2016	567
2017	780
2018	525
2019	1,668
2020	707
2021	1,131
2022	1,512
2023	794
2024	751
2025	776
2026	356

Download the Data

Data for records on 2008-05-21: 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Margin	Records
0 to 100	495
100 to 200	2
200 to 300	1
300 to 400	0
400 to 500	1