Weather Records on 15 May 2011

1,298 weather records were set or tied worldwide on 15 May 2011. Highest significance: Ellensburg, US.

Key Facts for 15 May 2011

On 15 May 2011, 1,298 weather records were set or tied at long-record stations worldwide.
185 were record highs and 750 were record lows, counting maximum and minimum temperature.
By timescale, 5 were all-time records, 40 monthly and 1,253 daily.
Ellensburg set an all-time record daily precipitation of 54.1 mm (2.1 in) on 15 May 2011.
Across 162 earlier years (1820 to 2026) the same calendar date averaged 425 records.

Record Map

1,298 stations

1,298 station records on 15 May 2011 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 15 May 2011: highest significance records shown on the map
Station	Country	Type	Value	Significance
Ellensburg	United States	Record daily precipitation	54.1 mm (2.1 in)	83 of 100 (Exceptional)
Batavia	United States	Record daily precipitation	53.3 mm (2.1 in)	69 of 100 (Major)
Ellensburg Bowers Fld	United States	Record daily precipitation	27.4 mm (1.1 in)	67 of 100 (Major)
Nouakchott	Mauritania	Record daily precipitation	74.9 mm (2.9 in)	65 of 100 (Major)
Calaveras Big Trees	United States	Record daily snowfall	20.1 cm (7.9 in)	65 of 100 (Major)
Hetch Hetchy	United States	Record daily snowfall	12.7 cm (5.0 in)	65 of 100 (Major)
Montpelier	United States	Record daily precipitation	81.8 mm (3.2 in)	62 of 100 (Major)
Wauna 3 W	United States	Record daily precipitation	44.2 mm (1.7 in)	62 of 100 (Major)
Tiffin	United States	Record daily precipitation	55.1 mm (2.2 in)	61 of 100 (Major)
Wapato	United States	Record daily precipitation	38.4 mm (1.5 in)	61 of 100 (Major)
Sviland	Norway	Record daily precipitation	39.0 mm (1.5 in)	60 of 100 (Major)
Huntington	United States	Record daily precipitation	114.3 mm (4.5 in)	60 of 100 (Major)
McMillin Rsvr	United States	Record daily precipitation	49.3 mm (1.9 in)	59 of 100 (Notable)
Seneca	United States	Record daily precipitation	29.7 mm (1.2 in)	58 of 100 (Notable)
Galion Wtr Wks	United States	Record daily precipitation	65.0 mm (2.6 in)	57 of 100 (Notable)
Sunnyside	United States	Record daily precipitation	35.6 mm (1.4 in)	55 of 100 (Notable)
Cherry Valley Dam	United States	Record daily snowfall	16.5 cm (6.5 in)	54 of 100 (Notable)
Louisville	United States	Record daily precipitation	51.1 mm (2.0 in)	54 of 100 (Notable)
Hetch Hetchy	United States	Record snow depth	12.7 cm (5.0 in)	52 of 100 (Notable)
Mansfield 4 NW	United States	Record low maximum temperature	19.4 C (66.9 F)	52 of 100 (Notable)
Bremerton	United States	Record daily precipitation	40.4 mm (1.6 in)	52 of 100 (Notable)
Linesville 1 S	United States	Record daily precipitation	50.5 mm (2.0 in)	51 of 100 (Notable)
Darwin Rch	United States	Record daily precipitation	30.2 mm (1.2 in)	51 of 100 (Notable)
Belmullet	Ireland	Record daily precipitation	30.7 mm (1.2 in)	50 of 100 (Notable)
Packwood	United States	Record daily precipitation	55.1 mm (2.2 in)	50 of 100 (Notable)
Erie Intl AP	United States	Record daily precipitation	39.9 mm (1.6 in)	50 of 100 (Notable)
Sacramento 5 ESE	United States	Record low maximum temperature	11.7 C (53.1 F)	50 of 100 (Notable)
Bowman Dam	United States	Record daily snowfall	20.3 cm (8.0 in)	49 of 100 (Notable)
Trough	United States	Record daily precipitation	48.3 mm (1.9 in)	49 of 100 (Notable)
Newton	United States	Record low maximum temperature	8.9 C (48.0 F)	47 of 100 (Notable)
Pendleton Branch Exp STN	United States	Record daily precipitation	27.7 mm (1.1 in)	47 of 100 (Notable)
Garnett 1 E	United States	Record low maximum temperature	13.3 C (55.9 F)	46 of 100 (Notable)
Goldendale	United States	Record daily precipitation	33.0 mm (1.3 in)	46 of 100 (Notable)
Sonoma	United States	Record low maximum temperature	13.9 C (57.0 F)	45 of 100 (Notable)
Kokomo 5 WSW	United States	Record daily precipitation	49.8 mm (2.0 in)	45 of 100 (Notable)
Holton	United States	Record low maximum temperature	12.8 C (55.0 F)	45 of 100 (Notable)
Kosciusko	United States	Record low maximum temperature	17.2 C (63.0 F)	45 of 100 (Notable)
Peru 2 WSW	United States	Record daily precipitation	40.6 mm (1.6 in)	45 of 100 (Notable)
Malheur Refuge HQ	United States	Record daily precipitation	47.0 mm (1.9 in)	45 of 100 (Notable)
Saint Johnsbury	United States	Record daily precipitation	39.6 mm (1.6 in)	45 of 100 (Notable)
Cle Elum	United States	Record daily precipitation	50.8 mm (2.0 in)	45 of 100 (Notable)
Dutch Harbor	United States	Record high minimum temperature	6.1 C (43.0 F)	45 of 100 (Notable)
Mammoth Spring	United States	Record low maximum temperature	13.9 C (57.0 F)	44 of 100 (Notable)
Weaverville	United States	Record low maximum temperature	6.7 C (44.1 F)	44 of 100 (Notable)
Mason City	United States	Record low maximum temperature	10.0 C (50.0 F)	44 of 100 (Notable)
Chazy	United States	Record daily precipitation	28.2 mm (1.1 in)	44 of 100 (Notable)
Winderie	Australia	Record daily precipitation	56.0 mm (2.2 in)	43 of 100 (Notable)
Avesta	Sweden	Record daily precipitation	27.4 mm (1.1 in)	43 of 100 (Notable)
Healdsburg	United States	Record low maximum temperature	14.4 C (57.9 F)	43 of 100 (Notable)
Pacific House	United States	Record daily snowfall	8.4 cm (3.3 in)	43 of 100 (Notable)
Santa Rosa	United States	Record low maximum temperature	14.4 C (57.9 F)	43 of 100 (Notable)
Farmerville	United States	Record low maximum temperature	19.4 C (66.9 F)	43 of 100 (Notable)
Brookhaven City	United States	Record low maximum temperature	20.6 C (69.1 F)	43 of 100 (Notable)
Canton 4N	United States	Record low maximum temperature	17.8 C (64.0 F)	43 of 100 (Notable)
Houston	United States	Record low maximum temperature	11.1 C (52.0 F)	43 of 100 (Notable)
Snow Mountain	United States	Record daily precipitation	43.2 mm (1.7 in)	43 of 100 (Notable)
Hardy	United States	Record low maximum temperature	13.9 C (57.0 F)	42 of 100 (Notable)
Kentfield	United States	Record low maximum temperature	14.4 C (57.9 F)	42 of 100 (Notable)
Clarksdale	United States	Record low maximum temperature	17.2 C (63.0 F)	42 of 100 (Notable)
Corinth 5 WSW	United States	Record low maximum temperature	16.7 C (62.1 F)	42 of 100 (Notable)

Counts by Type and Timescale

1,298 records

Records set or tied on 15 May 2011 by type: Highest daily maximum 84, Lowest daily maximum 502, Highest daily minimum 101, Lowest daily minimum 248, Heaviest daily rainfall 337, Heaviest daily snowfall 17, Deepest snow cover 9.

Records on 15 May 2011 by type
Record type	Records
Highest daily maximum	84
Lowest daily maximum	502
Highest daily minimum	101
Lowest daily minimum	248
Heaviest daily rainfall	337
Heaviest daily snowfall	17
Deepest snow cover	9

Records on 15 May 2011 by timescale: all-time 5, monthly 40, daily 1,253.

How Much Records Were Beaten By

1,038 broken records

Margins by which the 1,038 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 201.0. Ties are not counted.

Top 20 by Significance

15 May 2011

Top 20 records on 15 May 2011 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
15 May 2011	Ellensburg, US	all-time rain	54.1 mm (2.1 in)	8.9 mm (0.35 in)	109 years	83 of 100 (Exceptional)
15 May 2011	Batavia, US	daily rain	53.3 mm (2.1 in)	27.9 mm (1.1 in)	94 years	69 of 100 (Major)
15 May 2011	Ellensburg Bowers Fld, US	daily rain	27.4 mm (1.1 in)	23.1 mm (0.9 in)	66 years	67 of 100 (Major)
15 May 2011	Nouakchott, MR	daily rain	74.9 mm (2.9 in)	74.9 mm (2.9 in)	65 years	65 of 100 (Major)
15 May 2011	Calaveras Big Trees, US	daily snowfall	20.1 cm (7.9 in)	20.1 cm (7.9 in)	80 years	65 of 100 (Major)
15 May 2011	Hetch Hetchy, US	daily snowfall	12.7 cm (5.0 in)	12.7 cm (5.0 in)	100 years	65 of 100 (Major)
15 May 2011	Montpelier, US	daily rain	81.8 mm (3.2 in)	34.6 mm (1.4 in)	65 years	62 of 100 (Major)
15 May 2011	Wauna 3 W, US	daily rain	44.2 mm (1.7 in)	26.7 mm (1.1 in)	52 years	62 of 100 (Major)
15 May 2011	Tiffin, US	daily rain	55.1 mm (2.2 in)	23.3 mm (0.9 in)	88 years	61 of 100 (Major)
15 May 2011	Wapato, US	monthly rain	38.4 mm (1.5 in)	13.3 mm (0.5 in)	25 years	61 of 100 (Major)
15 May 2011	Sviland, NO	daily rain	39.0 mm (1.5 in)	13.3 mm (0.5 in)	104 years	60 of 100 (Major)
15 May 2011	Huntington, US	monthly rain	114.3 mm (4.5 in)	43.2 mm (1.7 in)	19 years	60 of 100 (Major)
15 May 2011	McMillin Rsvr, US	monthly rain	49.3 mm (1.9 in)	19.1 mm (0.8 in)	15 years	59 of 100 (Notable)
15 May 2011	Seneca, US	daily rain	29.7 mm (1.2 in)	18.5 mm (0.7 in)	29 years	58 of 100 (Notable)
15 May 2011	Galion Wtr Wks, US	daily rain	65.0 mm (2.6 in)	43.2 mm (1.7 in)	38 years	57 of 100 (Notable)
15 May 2011	Sunnyside, US	daily rain	35.6 mm (1.4 in)	18.1 mm (0.7 in)	16 years	55 of 100 (Notable)
15 May 2011	Cherry Valley Dam, US	daily snowfall	16.5 cm (6.5 in)	16.5 cm (6.5 in)	54 years	54 of 100 (Notable)
15 May 2011	Louisville, US	daily rain	51.1 mm (2.0 in)	30.3 mm (1.2 in)	53 years	54 of 100 (Notable)
15 May 2011	Hetch Hetchy, US	daily snow depth	12.7 cm (5.0 in)	12.7 cm (5.0 in)	100 years	52 of 100 (Notable)
15 May 2011	Mansfield 4 NW, US	daily low max	19.4 C (66.9 F)	3.9 C (7.0 F)	113 years	52 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

1820 to 2011

Records set or tied on this calendar date in each year from 1820 to 2011. 2011 had 1,298 records.

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

Records on 05-15 in each year
Year	Records
1820	1
1825	1
1831	1
1832	1
1837	2
1845	1
1847	2
1848	1
1855	2
1857	2
1859	1
1862	1
1863	1
1865	1
1866	2
1867	1
1868	2
1870	1
1871	3
1874	2
1876	4
1878	1
1879	2
1881	1
1883	1
1885	1
1886	2
1888	3
1891	3
1893	5
1894	2
1895	4
1896	2
1897	4
1898	3
1899	9
1900	9
1901	2
1902	9
1903	4
1904	13
1905	16
1906	10
1907	27
1908	25
1909	89
1910	27
1911	27
1912	26
1913	60
1914	16
1915	236
1916	27
1917	80
1918	133
1919	25
1920	58
1921	92
1922	30
1923	125
1924	174
1925	100
1926	161
1927	191
1928	144
1929	161
1930	136
1931	459
1932	368
1933	439
1934	227
1935	288
1936	372
1937	373
1938	393
1939	351
1940	179
1941	454
1942	701
1943	568
1944	630
1945	588
1946	238
1947	334
1948	264
1949	363
1950	260
1951	736
1952	476
1953	426
1954	355
1955	538
1956	466
1957	521
1958	605
1959	764
1960	291
1961	508
1962	1,128
1963	782
1964	347
1965	320
1966	389
1967	609
1968	1,019
1969	790
1970	512
1971	351
1972	484
1973	818
1974	1,230
1975	372
1976	803
1977	1,186
1978	922
1979	404
1980	625
1981	586
1982	500
1983	1,215
1984	1,059
1985	649
1986	679
1987	1,073
1988	643
1989	552
1990	776
1991	1,179
1992	944
1993	784
1994	910
1995	1,750
1996	1,452
1997	1,175
1998	1,641
1999	810
2000	850
2001	1,280
2002	801
2003	1,023
2004	1,046
2005	767
2006	955
2007	949
2008	995
2009	675
2010	1,088
2011	1,298
2012	751
2013	1,081
2014	1,411
2015	717
2016	890
2017	435
2018	1,074
2019	627
2020	472
2021	412
2022	847
2023	566
2024	596
2025	801
2026	481

Download the Data

Data for records on 2011-05-15: 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	1,021
50 to 100	10
100 to 150	3
150 to 200	3
200 to 250	1