Weather Records on 17 May 2009

1,050 weather records were set or tied worldwide on 17 May 2009. Highest significance: Armagh, GB.

Key Facts for 17 May 2009

On 17 May 2009, 1,050 weather records were set or tied at long-record stations worldwide.
351 were record highs and 438 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 21 monthly and 1,029 daily.
Armagh set a daily record precipitation of 60.0 mm (2.4 in) on 17 May 2009.
Across 167 earlier years (1802 to 2026) the same calendar date averaged 431 records.

Record Map

1,050 stations

1,050 station records on 17 May 2009 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 May 2009: highest significance records shown on the map
Station	Country	Type	Value	Significance
Armagh	United Kingdom	Record daily precipitation	60.0 mm (2.4 in)	80 of 100 (Exceptional)
Brunswick	United States	Record daily precipitation	74.4 mm (2.9 in)	65 of 100 (Major)
Nizhneudinsk	Russia	Record daily precipitation	28.4 mm (1.1 in)	60 of 100 (Major)
Union Springs 9 S	United States	Record daily precipitation	61.0 mm (2.4 in)	60 of 100 (Major)
Huahuaxtla (Cfe)	Mexico	Record daily precipitation	97.8 mm (3.9 in)	59 of 100 (Notable)
Antunez	Mexico	Record daily precipitation	39.6 mm (1.6 in)	58 of 100 (Notable)
Brewerton Lock 23	United States	Record daily precipitation	60.5 mm (2.4 in)	58 of 100 (Notable)
Willard 4 SW	United States	Record daily precipitation	75.9 mm (3.0 in)	57 of 100 (Notable)
Worcester	South Africa	Record daily precipitation	34.5 mm (1.4 in)	55 of 100 (Notable)
Simojovel (Dge)	Mexico	Record daily precipitation	104.1 mm (4.1 in)	54 of 100 (Notable)
Magdeburg	Germany	Record daily precipitation	26.7 mm (1.1 in)	53 of 100 (Notable)
Fulton	United States	Record daily precipitation	41.9 mm (1.6 in)	53 of 100 (Notable)
N Creek 5 SE	United States	Record daily precipitation	72.6 mm (2.9 in)	53 of 100 (Notable)
Zacapoaxtla (Smn)	Mexico	Record daily precipitation	67.1 mm (2.6 in)	52 of 100 (Notable)
Salisbury 2 N	United States	Record daily precipitation	61.2 mm (2.4 in)	52 of 100 (Notable)
Camden	United States	Record daily precipitation	58.2 mm (2.3 in)	51 of 100 (Notable)
Chemung	United States	Record daily precipitation	43.4 mm (1.7 in)	49 of 100 (Notable)
Raleigh 4 SW	United States	Record daily precipitation	52.1 mm (2.1 in)	48 of 100 (Notable)
Tubuai	French Polynesia	Record daily precipitation	87.1 mm (3.4 in)	47 of 100 (Notable)
Santiago Papasquiaro (Smn)	Mexico	Record daily precipitation	33.3 mm (1.3 in)	47 of 100 (Notable)
Auberry 2 NW	United States	Record high minimum temperature	25.6 C (78.1 F)	47 of 100 (Notable)
Altotonga	Mexico	Record daily precipitation	49.8 mm (2.0 in)	46 of 100 (Notable)
Crisp Co Pwr Dam	United States	Record daily precipitation	77.2 mm (3.0 in)	46 of 100 (Notable)
Banner Elk	United States	Record daily precipitation	67.6 mm (2.7 in)	45 of 100 (Notable)
Milanville	United States	Record daily precipitation	49.3 mm (1.9 in)	45 of 100 (Notable)
Elizabethton	United States	Record low maximum temperature	13.9 C (57.0 F)	45 of 100 (Notable)
Bakchar	Russia	Record daily precipitation	26.5 mm (1.0 in)	43 of 100 (Notable)
Meadows of Dan 5 SW	United States	Record daily precipitation	73.4 mm (2.9 in)	43 of 100 (Notable)
Aratichanguio	Mexico	Record daily precipitation	27.9 mm (1.1 in)	42 of 100 (Notable)
Selinsgrove 2 S	United States	Record daily precipitation	31.5 mm (1.2 in)	42 of 100 (Notable)
Towanda 1 S	United States	Record daily precipitation	43.9 mm (1.7 in)	42 of 100 (Notable)
Cornwall	United States	Record daily precipitation	42.7 mm (1.7 in)	42 of 100 (Notable)
Waycross 4 NE	United States	Record high minimum temperature	21.1 C (70.0 F)	41 of 100 (Notable)
Mina	United States	Record high maximum temperature	35.0 C (95.0 F)	41 of 100 (Notable)
Piseco	United States	Record daily precipitation	56.9 mm (2.2 in)	41 of 100 (Notable)
Grandfather Mtn	United States	Record daily precipitation	65.3 mm (2.6 in)	41 of 100 (Notable)
Washington Wwtp 4W	United States	Record daily precipitation	28.4 mm (1.1 in)	41 of 100 (Notable)
Pembina	United States	Record low maximum temperature	5.0 C (41.0 F)	41 of 100 (Notable)
Encarnacion	Mexico	Record daily precipitation	79.8 mm (3.1 in)	40 of 100 (Notable)
Salekhard	Russia	Record low minimum temperature	-16.4 C (2.5 F)	40 of 100 (Notable)
Mt Pleasant 1 SW	United States	Record low minimum temperature	1.1 C (34.0 F)	40 of 100 (Notable)
Crystal Springs Exp STN	United States	Record daily precipitation	87.6 mm (3.4 in)	40 of 100 (Notable)
Rolla Missouri S&T	United States	Record low minimum temperature	3.9 C (39.0 F)	40 of 100 (Notable)
Grapevine Dam	United States	Record low maximum temperature	20.0 C (68.0 F)	40 of 100 (Notable)
Newcomb	United States	Record daily precipitation	42.2 mm (1.7 in)	39 of 100 (Notable)
Slide Mtn	United States	Record daily precipitation	64.5 mm (2.5 in)	39 of 100 (Notable)
Waverly	United States	Record daily precipitation	37.6 mm (1.5 in)	39 of 100 (Notable)
Carson	United States	Record low minimum temperature	-6.1 C (21.0 F)	39 of 100 (Notable)
Teziutlan	Mexico	Record daily precipitation	49.8 mm (2.0 in)	38 of 100 (Notable)
Auberry 2 NW	United States	Record high maximum temperature	38.3 C (100.9 F)	38 of 100 (Notable)
Elgin Water	United States	Record low minimum temperature	1.1 C (34.0 F)	38 of 100 (Notable)
Keosauqua	United States	Record low minimum temperature	1.7 C (35.1 F)	38 of 100 (Notable)
Caledonia	United States	Record low minimum temperature	0.6 C (33.1 F)	38 of 100 (Notable)
Boonville 4 SSW	United States	Record daily precipitation	53.8 mm (2.1 in)	38 of 100 (Notable)
Albany	United States	Record low maximum temperature	17.8 C (64.0 F)	38 of 100 (Notable)
New Bern - ASOS	United States	Record daily precipitation	61.2 mm (2.4 in)	38 of 100 (Notable)
Ocozocoautla	Mexico	Record low maximum temperature	20.0 C (68.0 F)	37 of 100 (Notable)
Laguna del Fresno	Mexico	Record daily precipitation	30.0 mm (1.2 in)	37 of 100 (Notable)
Gettysburg	United States	Record low minimum temperature	-3.3 C (26.1 F)	37 of 100 (Notable)
Lexington	United States	Record daily precipitation	48.0 mm (1.9 in)	37 of 100 (Notable)

Counts by Type and Timescale

1,050 records

Records set or tied on 17 May 2009 by type: Highest daily maximum 205, Lowest daily maximum 271, Highest daily minimum 146, Lowest daily minimum 167, Heaviest daily rainfall 259, Heaviest daily snowfall 1, Deepest snow cover 1.

Records on 17 May 2009 by type
Record type	Records
Highest daily maximum	205
Lowest daily maximum	271
Highest daily minimum	146
Lowest daily minimum	167
Heaviest daily rainfall	259
Heaviest daily snowfall	1
Deepest snow cover	1

Records on 17 May 2009 by timescale: all-time 0, monthly 21, daily 1,029.

How Much Records Were Beaten By

766 broken records

Margins by which the 766 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 88.4. Ties are not counted.

Top 20 by Significance

17 May 2009

Top 20 records on 17 May 2009 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 May 2009	Armagh, GB	daily rain	60.0 mm (2.4 in)	36.1 mm (1.4 in)	129 years	80 of 100 (Exceptional)
17 May 2009	Brunswick, US	daily rain	74.4 mm (2.9 in)	49.8 mm (2.0 in)	75 years	65 of 100 (Major)
17 May 2009	Nizhneudinsk, RU	daily rain	28.4 mm (1.1 in)	22.7 mm (0.9 in)	46 years	60 of 100 (Major)
17 May 2009	Union Springs 9 S, US	daily rain	61.0 mm (2.4 in)	33.1 mm (1.3 in)	107 years	60 of 100 (Major)
17 May 2009	Huahuaxtla (Cfe), MX	daily rain	97.8 mm (3.9 in)	64.5 mm (2.5 in)	52 years	59 of 100 (Notable)
17 May 2009	Antunez, MX	daily rain	39.6 mm (1.6 in)	39.6 mm (1.6 in)	47 years	58 of 100 (Notable)
17 May 2009	Brewerton Lock 23, US	daily rain	60.5 mm (2.4 in)	31.8 mm (1.3 in)	39 years	58 of 100 (Notable)
17 May 2009	Willard 4 SW, US	daily rain	75.9 mm (3.0 in)	34.5 mm (1.4 in)	80 years	57 of 100 (Notable)
17 May 2009	Worcester, ZA	daily rain	34.5 mm (1.4 in)	20.5 mm (0.8 in)	55 years	55 of 100 (Notable)
17 May 2009	Simojovel (Dge), MX	daily rain	104.1 mm (4.1 in)	88.4 mm (3.5 in)	35 years	54 of 100 (Notable)
17 May 2009	Magdeburg, DE	daily rain	26.7 mm (1.1 in)	6.7 mm (0.26 in)	106 years	53 of 100 (Notable)
17 May 2009	Fulton, US	daily rain	41.9 mm (1.6 in)	17.3 mm (0.7 in)	67 years	53 of 100 (Notable)
17 May 2009	N Creek 5 SE, US	daily rain	72.6 mm (2.9 in)	29.7 mm (1.2 in)	36 years	53 of 100 (Notable)
17 May 2009	Zacapoaxtla (Smn), MX	daily rain	67.1 mm (2.6 in)	50.3 mm (2.0 in)	24 years	52 of 100 (Notable)
17 May 2009	Salisbury 2 N, US	daily rain	61.2 mm (2.4 in)	39.4 mm (1.6 in)	20 years	52 of 100 (Notable)
17 May 2009	Camden, US	daily rain	58.2 mm (2.3 in)	34.3 mm (1.4 in)	23 years	51 of 100 (Notable)
17 May 2009	Chemung, US	daily rain	43.4 mm (1.7 in)	20.3 mm (0.8 in)	44 years	49 of 100 (Notable)
17 May 2009	Raleigh 4 SW, US	daily rain	52.1 mm (2.1 in)	19.1 mm (0.8 in)	87 years	48 of 100 (Notable)
17 May 2009	Tubuai, PF	daily rain	87.1 mm (3.4 in)	63.2 mm (2.5 in)	16 years	47 of 100 (Notable)
17 May 2009	Santiago Papasquiaro (Smn), MX	daily rain	33.3 mm (1.3 in)	25.9 mm (1.0 in)	3 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

1802 to 2009

Records set or tied on this calendar date in each year from 1802 to 2009. 2009 had 1,050 records.

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

Records on 05-17 in each year
Year	Records
1802	2
1803	1
1808	1
1816	1
1834	1
1837	1
1839	1
1847	2
1848	1
1851	1
1853	1
1855	1
1858	1
1859	1
1861	2
1862	2
1863	2
1864	1
1871	2
1872	2
1873	2
1874	4
1877	1
1878	1
1879	2
1880	1
1881	1
1882	2
1883	3
1885	1
1887	1
1888	2
1889	3
1891	8
1892	4
1893	3
1895	8
1896	2
1897	3
1898	6
1899	7
1900	12
1901	2
1902	3
1903	9
1904	12
1905	10
1906	22
1907	10
1908	5
1909	33
1910	16
1911	30
1912	16
1913	24
1914	24
1915	53
1916	49
1917	18
1918	56
1919	35
1920	46
1921	50
1922	30
1923	95
1924	80
1925	326
1926	133
1927	264
1928	127
1929	168
1930	421
1931	201
1932	288
1933	365
1934	373
1935	341
1936	270
1937	183
1938	340
1939	285
1940	338
1941	408
1942	589
1943	855
1944	521
1945	799
1946	586
1947	249
1948	412
1949	544
1950	371
1951	373
1952	777
1953	441
1954	298
1955	570
1956	1,166
1957	469
1958	331
1959	488
1960	402
1961	291
1962	1,325
1963	368
1964	417
1965	462
1966	489
1967	644
1968	564
1969	638
1970	711
1971	723
1972	610
1973	1,016
1974	1,302
1975	365
1976	426
1977	1,078
1978	872
1979	459
1980	768
1981	940
1982	476
1983	1,326
1984	925
1985	561
1986	921
1987	1,054
1988	1,096
1989	1,307
1990	1,135
1991	1,237
1992	1,025
1993	495
1994	858
1995	1,734
1996	1,706
1997	1,619
1998	1,080
1999	795
2000	825
2001	960
2002	964
2003	1,127
2004	769
2005	784
2006	1,522
2007	742
2008	1,309
2009	1,050
2010	880
2011	1,483
2012	711
2013	739
2014	1,062
2015	824
2016	741
2017	1,302
2018	726
2019	686
2020	496
2021	443
2022	479
2023	385
2024	566
2025	928
2026	745

Download the Data

Data for records on 2009-05-17: 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 2026-10-18. Last revised 18 October 2026 (2026-10-18).

Margin	Records
0 to 20	725
20 to 40	33
40 to 60	5
60 to 80	2
80 to 100	1