Weather Records on 20 May 2015

1,001 weather records were set or tied worldwide on 20 May 2015. Highest significance: Atoka, US.

Key Facts for 20 May 2015

On 20 May 2015, 1,001 weather records were set or tied at long-record stations worldwide.
268 were record highs and 426 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 12 monthly and 989 daily.
Atoka set a monthly record daily precipitation of 181.6 mm (7.1 in) on 20 May 2015.
Across 162 earlier years (1802 to 2026) the same calendar date averaged 452 records.

Record Map

1,001 stations

1,001 station records on 20 May 2015 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 May 2015: highest significance records shown on the map
Station	Country	Type	Value	Significance
Atoka	United States	Record daily precipitation	181.6 mm (7.1 in)	80 of 100 (Exceptional)
Hill City	United States	Record daily snowfall	20.3 cm (8.0 in)	65 of 100 (Major)
Ordway 4 W	United States	Record daily precipitation	44.5 mm (1.8 in)	63 of 100 (Major)
Ellsworth 2W	United States	Record daily snowfall	17.8 cm (7.0 in)	63 of 100 (Major)
Gordon 6N	United States	Record daily snowfall	15.2 cm (6.0 in)	63 of 100 (Major)
Seymour 3NW	United States	Record daily precipitation	114.0 mm (4.5 in)	63 of 100 (Major)
Decatur	United States	Record daily precipitation	116.1 mm (4.6 in)	59 of 100 (Notable)
Lehigh 4 SW	United States	Record daily precipitation	116.3 mm (4.6 in)	58 of 100 (Notable)
Heyuan	China	Record daily precipitation	156.0 mm (6.1 in)	56 of 100 (Notable)
Antelope	United States	Record daily precipitation	128.3 mm (5.1 in)	56 of 100 (Notable)
Gordon 6N	United States	Record snow depth	15.2 cm (6.0 in)	55 of 100 (Notable)
Ratcliff	United States	Record daily precipitation	128.3 mm (5.1 in)	54 of 100 (Notable)
Mingo 6E	United States	Record daily precipitation	45.2 mm (1.8 in)	54 of 100 (Notable)
Hill City	United States	Record snow depth	10.2 cm (4.0 in)	53 of 100 (Notable)
Agate 3 E	United States	Record daily snowfall	6.4 cm (2.5 in)	52 of 100 (Notable)
Liberal	United States	Record daily precipitation	59.4 mm (2.3 in)	51 of 100 (Notable)
Chadron 3SW	United States	Record daily snowfall	5.1 cm (2.0 in)	51 of 100 (Notable)
Konawa	United States	Record daily precipitation	137.4 mm (5.4 in)	51 of 100 (Notable)
Alkali Lake	United States	Record daily precipitation	26.9 mm (1.1 in)	51 of 100 (Notable)
Harrisburg 12WNW	United States	Record daily snowfall	5.6 cm (2.2 in)	50 of 100 (Notable)
Hemingford	United States	Record daily snowfall	15.2 cm (6.0 in)	50 of 100 (Notable)
Oshkosh	United States	Record daily snowfall	5.1 cm (2.0 in)	50 of 100 (Notable)
Salida	United States	Record daily snowfall	12.7 cm (5.0 in)	48 of 100 (Notable)
McCracken	United States	Record daily precipitation	32.8 mm (1.3 in)	48 of 100 (Notable)
Crescent Lake Nwr	United States	Record daily snowfall	7.6 cm (3.0 in)	47 of 100 (Notable)
Springview 2NW	United States	Record low maximum temperature	6.1 C (43.0 F)	47 of 100 (Notable)
Pawhuska	United States	Record low maximum temperature	15.0 C (59.0 F)	47 of 100 (Notable)
Martin	United States	Record daily snowfall	7.6 cm (3.0 in)	47 of 100 (Notable)
Springview 2NW	United States	Record low minimum temperature	-2.2 C (28.0 F)	46 of 100 (Notable)
Tuena (Wyoming)	Australia	Record daily precipitation	36.5 mm (1.4 in)	45 of 100 (Notable)
Wallace	United States	Record daily precipitation	35.8 mm (1.4 in)	45 of 100 (Notable)
Norton 9SSE	United States	Record low maximum temperature	6.7 C (44.1 F)	44 of 100 (Notable)
Pratt 3NW	United States	Record low maximum temperature	10.6 C (51.1 F)	44 of 100 (Notable)
Ulysses 3NE	United States	Record low maximum temperature	7.8 C (46.0 F)	44 of 100 (Notable)
Versailles	United States	Record low maximum temperature	12.2 C (54.0 F)	44 of 100 (Notable)
Harrison	United States	Record low maximum temperature	2.8 C (37.0 F)	44 of 100 (Notable)
Tishomingo Natl Wr	United States	Record daily precipitation	76.2 mm (3.0 in)	44 of 100 (Notable)
Lamar	United States	Record low maximum temperature	8.9 C (48.0 F)	43 of 100 (Notable)
Decatur Wtp	United States	Record low maximum temperature	11.1 C (52.0 F)	43 of 100 (Notable)
Atwood	United States	Record daily precipitation	47.0 mm (1.9 in)	43 of 100 (Notable)
Elkhart	United States	Record low maximum temperature	8.9 C (48.0 F)	43 of 100 (Notable)
Hays 1 S	United States	Record low maximum temperature	8.3 C (46.9 F)	43 of 100 (Notable)
Holton	United States	Record low maximum temperature	12.8 C (55.0 F)	43 of 100 (Notable)
Norwich	United States	Record low maximum temperature	13.3 C (55.9 F)	43 of 100 (Notable)
Arthur	United States	Record daily snowfall	5.1 cm (2.0 in)	43 of 100 (Notable)
Harrison	United States	Record daily snowfall	7.1 cm (2.8 in)	43 of 100 (Notable)
Seward	United States	Record low maximum temperature	8.9 C (48.0 F)	43 of 100 (Notable)
Enid	United States	Record low maximum temperature	15.0 C (59.0 F)	43 of 100 (Notable)
Pactola Dam	United States	Record daily snowfall	12.2 cm (4.8 in)	43 of 100 (Notable)
Anthony	United States	Record low maximum temperature	13.9 C (57.0 F)	43 of 100 (Notable)
Eads	United States	Record low maximum temperature	6.7 C (44.1 F)	42 of 100 (Notable)
Kit Carson	United States	Record low maximum temperature	6.1 C (43.0 F)	42 of 100 (Notable)
Champaign 3S	United States	Record low maximum temperature	10.6 C (51.1 F)	42 of 100 (Notable)
Corning	United States	Record low maximum temperature	11.7 C (53.1 F)	42 of 100 (Notable)
McPherson	United States	Record low maximum temperature	13.9 C (57.0 F)	42 of 100 (Notable)
Carrollton	United States	Record low maximum temperature	15.0 C (59.0 F)	42 of 100 (Notable)
Bridgeport	United States	Record low maximum temperature	3.9 C (39.0 F)	42 of 100 (Notable)
Crete 4ESE	United States	Record low maximum temperature	8.9 C (48.0 F)	42 of 100 (Notable)
Ravenna	United States	Record low maximum temperature	6.1 C (43.0 F)	42 of 100 (Notable)
Tecumseh 1S	United States	Record low maximum temperature	11.7 C (53.1 F)	42 of 100 (Notable)

Counts by Type and Timescale

1,001 records

Records set or tied on 20 May 2015 by type: Highest daily maximum 103, Lowest daily maximum 348, Highest daily minimum 165, Lowest daily minimum 78, Heaviest daily rainfall 264, Heaviest daily snowfall 27, Deepest snow cover 16.

Records on 20 May 2015 by type
Record type	Records
Highest daily maximum	103
Lowest daily maximum	348
Highest daily minimum	165
Lowest daily minimum	78
Heaviest daily rainfall	264
Heaviest daily snowfall	27
Deepest snow cover	16

Records on 20 May 2015 by timescale: all-time 0, monthly 12, daily 989.

How Much Records Were Beaten By

815 broken records

Margins by which the 815 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 270.0. Ties are not counted.

Top 20 by Significance

20 May 2015

Top 20 records on 20 May 2015 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 May 2015	Atoka, US	monthly rain	181.6 mm (7.1 in)	72.9 mm (2.9 in)	72 years	80 of 100 (Exceptional)
20 May 2015	Hill City, US	daily snowfall	20.3 cm (8.0 in)	20.3 cm (8.0 in)	105 years	65 of 100 (Major)
20 May 2015	Ordway 4 W, US	daily rain	44.5 mm (1.8 in)	25.7 mm (1.0 in)	84 years	63 of 100 (Major)
20 May 2015	Ellsworth 2W, US	daily snowfall	17.8 cm (7.0 in)	17.8 cm (7.0 in)	70 years	63 of 100 (Major)
20 May 2015	Gordon 6N, US	daily snowfall	15.2 cm (6.0 in)	12.7 cm (5.0 in)	100 years	63 of 100 (Major)
20 May 2015	Seymour 3NW, US	daily rain	114.0 mm (4.5 in)	69.3 mm (2.7 in)	52 years	63 of 100 (Major)
20 May 2015	Decatur, US	daily rain	116.1 mm (4.6 in)	88.2 mm (3.5 in)	30 years	59 of 100 (Notable)
20 May 2015	Lehigh 4 SW, US	daily rain	116.3 mm (4.6 in)	85.3 mm (3.4 in)	29 years	58 of 100 (Notable)
20 May 2015	Heyuan, CN	daily rain	156.0 mm (6.1 in)	95.9 mm (3.8 in)	40 years	56 of 100 (Notable)
20 May 2015	Antelope, US	daily rain	128.3 mm (5.1 in)	90.5 mm (3.6 in)	22 years	56 of 100 (Notable)
20 May 2015	Gordon 6N, US	daily snow depth	15.2 cm (6.0 in)	15.2 cm (6.0 in)	116 years	55 of 100 (Notable)
20 May 2015	Ratcliff, US	daily rain	128.3 mm (5.1 in)	90.2 mm (3.6 in)	24 years	54 of 100 (Notable)
20 May 2015	Mingo 6E, US	daily rain	45.2 mm (1.8 in)	30.5 mm (1.2 in)	65 years	54 of 100 (Notable)
20 May 2015	Hill City, US	daily snow depth	10.2 cm (4.0 in)	10.2 cm (4.0 in)	105 years	53 of 100 (Notable)
20 May 2015	Agate 3 E, US	daily snowfall	6.4 cm (2.5 in)	6.4 cm (2.5 in)	112 years	52 of 100 (Notable)
20 May 2015	Liberal, US	daily rain	59.4 mm (2.3 in)	17.0 mm (0.7 in)	105 years	51 of 100 (Notable)
20 May 2015	Chadron 3SW, US	daily snowfall	5.1 cm (2.0 in)	5.1 cm (2.0 in)	100 years	51 of 100 (Notable)
20 May 2015	Konawa, US	daily rain	137.4 mm (5.4 in)	71.4 mm (2.8 in)	37 years	51 of 100 (Notable)
20 May 2015	Alkali Lake, US	daily rain	26.9 mm (1.1 in)	16.5 mm (0.6 in)	52 years	51 of 100 (Notable)
20 May 2015	Harrisburg 12WNW, US	daily snowfall	5.6 cm (2.2 in)	5.6 cm (2.2 in)	102 years	50 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 2015

Records set or tied on this calendar date in each year from 1802 to 2015. 2015 had 1,001 records.

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

Records on 05-20 in each year
Year	Records
1802	1
1803	1
1804	1
1815	1
1825	1
1837	1
1844	1
1845	3
1847	1
1854	1
1858	3
1861	1
1862	1
1865	1
1867	1
1868	2
1870	3
1871	2
1876	2
1877	3
1879	1
1880	2
1884	2
1885	1
1887	2
1889	3
1890	3
1891	5
1892	3
1893	1
1894	6
1895	3
1896	3
1897	3
1898	4
1899	4
1900	1
1901	5
1902	11
1903	19
1904	4
1905	4
1906	22
1907	35
1908	23
1909	10
1910	20
1911	82
1912	20
1913	10
1914	16
1915	42
1916	29
1917	46
1918	92
1919	56
1920	44
1921	234
1922	40
1923	125
1924	189
1925	251
1926	128
1927	118
1928	138
1929	323
1930	129
1931	451
1932	689
1933	449
1934	582
1935	259
1936	207
1937	270
1938	331
1939	266
1940	337
1941	378
1942	337
1943	802
1944	315
1945	498
1946	339
1947	358
1948	514
1949	586
1950	327
1951	288
1952	615
1953	518
1954	822
1955	421
1956	565
1957	728
1958	378
1959	785
1960	612
1961	333
1962	773
1963	732
1964	517
1965	200
1966	416
1967	587
1968	743
1969	885
1970	310
1971	653
1972	612
1973	419
1974	893
1975	1,332
1976	837
1977	553
1978	534
1979	683
1980	751
1981	1,540
1982	554
1983	1,307
1984	867
1985	426
1986	790
1987	1,036
1988	805
1989	764
1990	722
1991	925
1992	1,200
1993	1,208
1994	778
1995	734
1996	1,749
1997	1,106
1998	1,124
1999	673
2000	991
2001	847
2002	2,299
2003	1,201
2004	746
2005	929
2006	1,006
2007	565
2008	999
2009	1,529
2010	1,011
2011	1,117
2012	604
2013	919
2014	629
2015	1,001
2016	692
2017	1,214
2018	460
2019	1,483
2020	784
2021	904
2022	1,643
2023	1,106
2024	478
2025	969
2026	696

Download the Data

Data for records on 2015-05-20: 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 50	782
50 to 100	22
100 to 150	6
150 to 200	3
200 to 250	1
250 to 300	1