Weather Records on 31 May 2009

570 weather records were set or tied worldwide on 31 May 2009. Highest significance: Warmun, AU.

Key Facts for 31 May 2009

On 31 May 2009, 570 weather records were set or tied at long-record stations worldwide.
275 were record highs and 173 were record lows, counting maximum and minimum temperature.
By timescale, 3 were all-time records, 36 monthly and 531 daily.
Warmun set a daily record precipitation of 25.5 mm (1.0 in) on 31 May 2009.
Across 161 earlier years (1811 to 2026) the same calendar date averaged 437 records.

Record Map

570 stations

570 station records on 31 May 2009 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 31 May 2009: highest significance records shown on the map
Station	Country	Type	Value	Significance
Warmun	Australia	Record daily precipitation	25.5 mm (1.0 in)	64 of 100 (Major)
Tepeyahualco	Mexico	Record daily precipitation	69.9 mm (2.8 in)	57 of 100 (Notable)
Hetch Hetchy	United States	Record daily precipitation	46.2 mm (1.8 in)	57 of 100 (Notable)
Pitea	Sweden	Record high maximum temperature	29.5 C (85.1 F)	53 of 100 (Notable)
Woomera (Arcoona)	Australia	Record daily precipitation	26.0 mm (1.0 in)	51 of 100 (Notable)
Pedro Montoya	Mexico	Record daily precipitation	32.8 mm (1.3 in)	47 of 100 (Notable)
Joseph	United States	Record high minimum temperature	13.3 C (55.9 F)	44 of 100 (Notable)
Sterling City	United States	Record daily precipitation	60.5 mm (2.4 in)	44 of 100 (Notable)
Grand Portage	United States	Record low minimum temperature	-1.7 C (28.9 F)	43 of 100 (Notable)
Arltunga	Australia	Record daily precipitation	30.2 mm (1.2 in)	42 of 100 (Notable)
Harbor Beach 1 SSE	United States	Record low minimum temperature	1.7 C (35.1 F)	42 of 100 (Notable)
Hinckley	United States	Record low minimum temperature	-1.1 C (30.0 F)	42 of 100 (Notable)
Appleton	United States	Record low minimum temperature	2.2 C (36.0 F)	42 of 100 (Notable)
Ola	United States	Record high maximum temperature	31.7 C (89.1 F)	41 of 100 (Notable)
Hayward Rs	United States	Record low minimum temperature	-2.8 C (27.0 F)	41 of 100 (Notable)
Plan de Ayala	Mexico	Record daily precipitation	45.0 mm (1.8 in)	39 of 100 (Notable)
Lulea-Bergnaset	Sweden	Record high maximum temperature	28.0 C (82.4 F)	39 of 100 (Notable)
Brooklyn (Sandbrook Inlet)	Australia	Record daily precipitation	57.7 mm (2.3 in)	38 of 100 (Notable)
Sihccajavri	Norway	Record high minimum temperature	9.2 C (48.6 F)	38 of 100 (Notable)
Kewaunee	United States	Record low minimum temperature	1.7 C (35.1 F)	38 of 100 (Notable)
Chalchihuites (Smn)	Mexico	Record low minimum temperature	5.0 C (41.0 F)	37 of 100 (Notable)
Barrow AP	United States	Record daily snowfall	7.9 cm (3.1 in)	37 of 100 (Notable)
Greenville 2 NNE	United States	Record low minimum temperature	0.0 C (32.0 F)	36 of 100 (Notable)
Rioverde (Dge)	Mexico	Record daily precipitation	29.0 mm (1.1 in)	35 of 100 (Notable)
Sanya	China	Record low maximum temperature	26.7 C (80.1 F)	34 of 100 (Routine)
New Delhi/Safdarjun	India	Record daily precipitation	42.9 mm (1.7 in)	34 of 100 (Routine)
Lannas	Sweden	Record high maximum temperature	29.3 C (84.7 F)	34 of 100 (Routine)
Waterville	United States	Record high minimum temperature	16.1 C (61.0 F)	34 of 100 (Routine)
Mount Riddock	Australia	Record daily precipitation	30.8 mm (1.2 in)	33 of 100 (Routine)
Cromer Golf Club	Australia	Record daily precipitation	46.0 mm (1.8 in)	33 of 100 (Routine)
Rio Frio	Mexico	Record daily precipitation	68.1 mm (2.7 in)	33 of 100 (Routine)
Ostrov Golomjannyj	Russia	Record high minimum temperature	-0.1 C (31.8 F)	33 of 100 (Routine)
Storfinnforsen	Sweden	Record high minimum temperature	13.2 C (55.8 F)	33 of 100 (Routine)
Gallivare_A	Sweden	Record high minimum temperature	10.7 C (51.3 F)	33 of 100 (Routine)
Trousdale 1 NE	United States	Record daily precipitation	34.0 mm (1.3 in)	33 of 100 (Routine)
Hale Loud Dam	United States	Record low minimum temperature	-1.1 C (30.0 F)	33 of 100 (Routine)
The Garden	Australia	Record daily precipitation	31.6 mm (1.2 in)	32 of 100 (Routine)
Comondu	Mexico	Record high maximum temperature	42.8 C (109.0 F)	32 of 100 (Routine)
Santa Elena	Mexico	Record low maximum temperature	22.8 C (73.0 F)	32 of 100 (Routine)
Prosser	United States	Record high maximum temperature	34.4 C (93.9 F)	32 of 100 (Routine)
Atenco	Mexico	Record daily precipitation	41.9 mm (1.6 in)	31 of 100 (Routine)
Vardoe	Norway	Record high minimum temperature	6.7 C (44.1 F)	31 of 100 (Routine)
Eastbourne	United Kingdom	Record high maximum temperature	25.0 C (77.0 F)	31 of 100 (Routine)
Grass Range	United States	Record high minimum temperature	13.9 C (57.0 F)	31 of 100 (Routine)
Cody	United States	Record high minimum temperature	15.0 C (59.0 F)	31 of 100 (Routine)
Strathgordon Village	Australia	Record low minimum temperature	-5.0 C (23.0 F)	30 of 100 (Routine)
Dzaore	Russia	Record high minimum temperature	9.2 C (48.6 F)	30 of 100 (Routine)
Rosta	Sweden	Record high minimum temperature	14.8 C (58.6 F)	30 of 100 (Routine)
Onaway 4N	United States	Record low minimum temperature	-1.7 C (28.9 F)	30 of 100 (Routine)
Claraville	Australia	Record daily precipitation	39.1 mm (1.5 in)	29 of 100 (Routine)
New Plymouth AWS	New Zealand	Record low maximum temperature	10.2 C (50.4 F)	29 of 100 (Routine)
Minocqua	United States	Record low minimum temperature	-2.2 C (28.0 F)	29 of 100 (Routine)
Ceduna AMO	Australia	Record low minimum temperature	-0.5 C (31.1 F)	28 of 100 (Routine)
Bolton Point (the Ridge Way)	Australia	Record daily precipitation	34.0 mm (1.3 in)	28 of 100 (Routine)
Poljarnoe	Russia	Record high maximum temperature	21.8 C (71.2 F)	28 of 100 (Routine)
Melbourne WFO	United States	Record high maximum temperature	33.9 C (93.0 F)	28 of 100 (Routine)
Berowra (Goodwyn Road)	Australia	Record daily precipitation	37.2 mm (1.5 in)	27 of 100 (Routine)
Hostotipaquillo	Mexico	Record low maximum temperature	26.7 C (80.1 F)	27 of 100 (Routine)
Presa Iturbide	Mexico	Record high maximum temperature	31.7 C (89.1 F)	27 of 100 (Routine)
Ojmjakon	Russia	Record high minimum temperature	9.4 C (48.9 F)	27 of 100 (Routine)

Counts by Type and Timescale

570 records

Records set or tied on 31 May 2009 by type: Highest daily maximum 137, Lowest daily maximum 62, Highest daily minimum 138, Lowest daily minimum 111, Heaviest daily rainfall 121, Heaviest daily snowfall 1.

Records on 31 May 2009 by type
Record type	Records
Highest daily maximum	137
Lowest daily maximum	62
Highest daily minimum	138
Lowest daily minimum	111
Heaviest daily rainfall	121
Heaviest daily snowfall	1
Deepest snow cover	0

Records on 31 May 2009 by timescale: all-time 3, monthly 36, daily 531.

How Much Records Were Beaten By

417 broken records

Margins by which the 417 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 47.0. Ties are not counted.

Top 20 by Significance

31 May 2009

Top 20 records on 31 May 2009 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
31 May 2009	Warmun, AU	daily rain	25.5 mm (1.0 in)	25.5 mm (1.0 in)	109 years	64 of 100 (Major)
31 May 2009	Tepeyahualco, MX	monthly rain	69.9 mm (2.8 in)	24.9 mm (1.0 in)	33 years	57 of 100 (Notable)
31 May 2009	Hetch Hetchy, US	daily rain	46.2 mm (1.8 in)	24.9 mm (1.0 in)	60 years	57 of 100 (Notable)
31 May 2009	Pitea, SE	monthly high max	29.5 C (85.1 F)	1.5 C (2.7 F)	120 years	53 of 100 (Notable)
31 May 2009	Woomera (Arcoona), AU	daily rain	26.0 mm (1.0 in)	11.5 mm (0.5 in)	76 years	51 of 100 (Notable)
31 May 2009	Pedro Montoya, MX	daily rain	32.8 mm (1.3 in)	30.5 mm (1.2 in)	16 years	47 of 100 (Notable)
31 May 2009	Joseph, US	daily high min	13.3 C (55.9 F)	1.6 C (2.9 F)	114 years	44 of 100 (Notable)
31 May 2009	Sterling City, US	daily rain	60.5 mm (2.4 in)	32.6 mm (1.3 in)	48 years	44 of 100 (Notable)
31 May 2009	Grand Portage, US	daily low min	-1.7 C (28.9 F)	1.1 C (2.0 F)	112 years	43 of 100 (Notable)
31 May 2009	Arltunga, AU	daily rain	30.2 mm (1.2 in)	18.8 mm (0.7 in)	60 years	42 of 100 (Notable)
31 May 2009	Harbor Beach 1 SSE, US	daily low min	1.7 C (35.1 F)	1.1 C (2.0 F)	104 years	42 of 100 (Notable)
31 May 2009	Hinckley, US	daily low min	-1.1 C (30.0 F)	1.1 C (2.0 F)	100 years	42 of 100 (Notable)
31 May 2009	Appleton, US	daily low min	2.2 C (36.0 F)	1.7 C (3.1 F)	99 years	42 of 100 (Notable)
31 May 2009	Ola, US	daily high max	31.7 C (89.1 F)	0.6 C (1.1 F)	106 years	41 of 100 (Notable)
31 May 2009	Hayward Rs, US	daily low min	-2.8 C (27.0 F)	1.1 C (2.0 F)	111 years	41 of 100 (Notable)
31 May 2009	Plan de Ayala, MX	daily rain	45.0 mm (1.8 in)	32.0 mm (1.3 in)	22 years	39 of 100 (Notable)
31 May 2009	Lulea-Bergnaset, SE	monthly high max	28.0 C (82.4 F)	0.6 C (1.1 F)	68 years	39 of 100 (Notable)
31 May 2009	Brooklyn (Sandbrook Inlet), AU	daily rain	57.7 mm (2.3 in)	25.2 mm (1.0 in)	62 years	38 of 100 (Notable)
31 May 2009	Sihccajavri, NO	daily high min	9.2 C (48.6 F)	2.0 C (3.6 F)	84 years	38 of 100 (Notable)
31 May 2009	Kewaunee, US	daily low min	1.7 C (35.1 F)	0.5 C (0.9 F)	92 years	38 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

1811 to 2009

Records set or tied on this calendar date in each year from 1811 to 2009. 2009 had 570 records.

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

Records on 05-31 in each year
Year	Records
1811	1
1818	3
1827	1
1836	2
1845	1
1847	1
1853	2
1855	2
1858	1
1864	2
1865	1
1866	1
1867	1
1868	4
1869	1
1871	2
1873	3
1874	1
1877	1
1878	2
1879	2
1880	3
1882	1
1883	1
1885	1
1888	1
1889	2
1890	1
1892	1
1893	4
1894	2
1895	8
1897	5
1898	7
1899	1
1900	2
1901	9
1902	9
1903	17
1904	19
1905	7
1906	11
1907	20
1908	12
1909	8
1910	26
1911	20
1912	15
1913	83
1914	20
1915	23
1916	23
1917	13
1918	20
1919	44
1920	46
1921	157
1922	49
1923	98
1924	152
1925	226
1926	228
1927	121
1928	67
1929	246
1930	612
1931	223
1932	181
1933	397
1934	782
1935	156
1936	559
1937	462
1938	424
1939	461
1940	383
1941	410
1942	364
1943	552
1944	372
1945	457
1946	380
1947	439
1948	295
1949	303
1950	467
1951	640
1952	374
1953	654
1954	445
1955	534
1956	632
1957	304
1958	429
1959	459
1960	247
1961	472
1962	565
1963	354
1964	1,237
1965	494
1966	601
1967	987
1968	276
1969	555
1970	573
1971	714
1972	1,127
1973	418
1974	473
1975	797
1976	435
1977	605
1978	873
1979	915
1980	517
1981	775
1982	817
1983	1,494
1984	2,047
1985	790
1986	1,365
1987	822
1988	1,255
1989	912
1990	900
1991	1,381
1992	1,031
1993	982
1994	776
1995	693
1996	946
1997	1,163
1998	1,215
1999	790
2000	1,172
2001	1,047
2002	1,162
2003	831
2004	1,071
2005	724
2006	1,045
2007	793
2008	809
2009	570
2010	741
2011	1,498
2012	764
2013	1,100
2014	565
2015	704
2016	402
2017	440
2018	1,211
2019	420
2020	673
2021	834
2022	902
2023	454
2024	809
2025	1,204
2026	536

Download the Data

Data for records on 2009-05-31: 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).

Histogram of margins by which records were beaten on 31 May 2009
Margin	Records
0 to 10	371
10 to 20	27
20 to 30	14
30 to 40	4
40 to 50	1