Weather Records on 15 May 1957

521 weather records were set or tied worldwide on 15 May 1957. Highest significance: Hennessey 4 ESE, US.

Key Facts for 15 May 1957

On 15 May 1957, 521 weather records were set or tied at long-record stations worldwide.
148 were record highs and 103 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 5 monthly and 515 daily.
Hennessey 4 ESE set an all-time record daily precipitation of 248.4 mm (9.8 in) on 15 May 1957.
Across 162 earlier years (1820 to 2026) the same calendar date averaged 430 records.

Record Map

521 stations

521 station records on 15 May 1957 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 15 May 1957: highest significance records shown on the map
Station	Country	Type	Value	Significance
Hennessey 4 ESE	United States	Record daily precipitation	248.4 mm (9.8 in)	73 of 100 (Major)
Boulder	United States	Record daily precipitation	53.6 mm (2.1 in)	56 of 100 (Notable)
Caledonia	United States	Record daily precipitation	58.2 mm (2.3 in)	56 of 100 (Notable)
Eureka	United States	Record daily precipitation	31.0 mm (1.2 in)	51 of 100 (Notable)
Kherson	Ukraine	Record daily precipitation	27.9 mm (1.1 in)	50 of 100 (Notable)
Penn Yan	United States	Record daily precipitation	63.5 mm (2.5 in)	50 of 100 (Notable)
Newberry-Luce Co Rd Commission	United States	Record daily precipitation	44.7 mm (1.8 in)	49 of 100 (Notable)
Svirica	Russia	Record daily precipitation	26.6 mm (1.0 in)	48 of 100 (Notable)
Kissimmee	United States	Record daily precipitation	83.8 mm (3.3 in)	43 of 100 (Notable)
Warren	United States	Record daily precipitation	39.1 mm (1.5 in)	43 of 100 (Notable)
Brooksville Chin Hill	United States	Record daily precipitation	81.3 mm (3.2 in)	40 of 100 (Notable)
Pembroke Eddy Match	Canada	Record low maximum temperature	7.2 C (45.0 F)	38 of 100 (Notable)
Parker 6 E	United States	Record daily precipitation	26.7 mm (1.1 in)	38 of 100 (Notable)
Kekaha 944	United States	Record daily precipitation	32.0 mm (1.3 in)	38 of 100 (Notable)
Napa State Hospital	United States	Record daily precipitation	25.4 mm (1.0 in)	37 of 100 (Notable)
Silverton	United States	Record daily snowfall	10.2 cm (4.0 in)	37 of 100 (Notable)
Sable Island	Canada	Record low minimum temperature	-2.2 C (28.0 F)	36 of 100 (Notable)
Monument 2 WSW	United States	Record daily snowfall	24.1 cm (9.5 in)	36 of 100 (Notable)
Avon Park 2 W	United States	Record daily precipitation	107.4 mm (4.2 in)	36 of 100 (Notable)
Plant City	United States	Record daily precipitation	88.1 mm (3.5 in)	36 of 100 (Notable)
Phillipsburg	United States	Record daily precipitation	47.5 mm (1.9 in)	36 of 100 (Notable)
Bluff City	United States	Record daily precipitation	45.2 mm (1.8 in)	36 of 100 (Notable)
Isleworth	United States	Record daily precipitation	61.2 mm (2.4 in)	35 of 100 (Notable)
Gaylord	United States	Record daily precipitation	53.3 mm (2.1 in)	35 of 100 (Notable)
Atlanta 5 WNW	United States	Record daily precipitation	33.0 mm (1.3 in)	34 of 100 (Routine)
Crested Butte	United States	Record daily snowfall	10.2 cm (4.0 in)	33 of 100 (Routine)
Hickory	United States	Record daily precipitation	51.6 mm (2.0 in)	33 of 100 (Routine)
Colunio	Australia	Record daily precipitation	32.5 mm (1.3 in)	32 of 100 (Routine)
Westcliffe	United States	Record daily precipitation	43.2 mm (1.7 in)	32 of 100 (Routine)
Altoona Horseshoe Curv	United States	Record daily precipitation	47.0 mm (1.9 in)	32 of 100 (Routine)
Shawano 2SSW	United States	Record daily precipitation	30.0 mm (1.2 in)	32 of 100 (Routine)
Houston Wb City	United States	Record high minimum temperature	23.9 C (75.0 F)	32 of 100 (Routine)
Brome	Canada	Record daily precipitation	37.6 mm (1.5 in)	31 of 100 (Routine)
Telluride 4WNW	United States	Record daily snowfall	7.6 cm (3.0 in)	31 of 100 (Routine)
Cedar Key 1 WSW	United States	Record daily precipitation	92.5 mm (3.6 in)	31 of 100 (Routine)
Vanderbilt 11ENE	United States	Record daily precipitation	27.7 mm (1.1 in)	31 of 100 (Routine)
Sagar	India	Record daily precipitation	48.3 mm (1.9 in)	30 of 100 (Routine)
Idaho Springs	United States	Record daily precipitation	30.2 mm (1.2 in)	30 of 100 (Routine)
Lake Alfred Exp STN	United States	Record daily precipitation	53.8 mm (2.1 in)	30 of 100 (Routine)
Narrogin	Australia	Record daily precipitation	26.7 mm (1.1 in)	29 of 100 (Routine)
Timovskoe	Russia	Record low minimum temperature	-4.8 C (23.4 F)	29 of 100 (Routine)
Lake Moraine	United States	Record daily snowfall	45.7 cm (18.0 in)	29 of 100 (Routine)
Paterson	United States	Record daily precipitation	64.8 mm (2.6 in)	29 of 100 (Routine)
Mt Wx	United States	Record daily precipitation	50.8 mm (2.0 in)	29 of 100 (Routine)
Hawthorne	United States	Record daily precipitation	66.0 mm (2.6 in)	28 of 100 (Routine)
Alpena Co Rgnl AP	United States	Record daily precipitation	25.7 mm (1.0 in)	28 of 100 (Routine)
Kipawa Laniel	Canada	Record daily snowfall	10.2 cm (4.0 in)	27 of 100 (Routine)
Poretskoye	Russia	Record high maximum temperature	30.7 C (87.3 F)	27 of 100 (Routine)
Bridgeport 5 NW	United States	Record daily precipitation	43.2 mm (1.7 in)	27 of 100 (Routine)
Waterdale	United States	Record daily precipitation	30.5 mm (1.2 in)	27 of 100 (Routine)
W Branch 3SE	United States	Record daily precipitation	25.1 mm (1.0 in)	27 of 100 (Routine)
Niznij Novgorod	Russia	Record high minimum temperature	17.9 C (64.2 F)	26 of 100 (Routine)
Willow Lock 13	United States	Record daily precipitation	37.6 mm (1.5 in)	26 of 100 (Routine)
Harrison 1 NNW	United States	Record daily precipitation	26.7 mm (1.1 in)	26 of 100 (Routine)
Moab	United States	Record low maximum temperature	15.0 C (59.0 F)	26 of 100 (Routine)
Cuballing	Australia	Record daily precipitation	26.4 mm (1.0 in)	25 of 100 (Routine)
Nippering	Australia	Record daily precipitation	29.7 mm (1.2 in)	25 of 100 (Routine)
Harrington Harbour	Canada	Record daily snowfall	5.1 cm (2.0 in)	25 of 100 (Routine)
Del Norte 3ENE	United States	Record daily snowfall	5.1 cm (2.0 in)	25 of 100 (Routine)
Columbus	United States	Record high minimum temperature	17.8 C (64.0 F)	25 of 100 (Routine)

Counts by Type and Timescale

521 records

Records set or tied on 15 May 1957 by type: Highest daily maximum 42, Lowest daily maximum 80, Highest daily minimum 106, Lowest daily minimum 23, Heaviest daily rainfall 248, Heaviest daily snowfall 20, Deepest snow cover 2.

Records on 15 May 1957 by type
Record type	Records
Highest daily maximum	42
Lowest daily maximum	80
Highest daily minimum	106
Lowest daily minimum	23
Heaviest daily rainfall	248
Heaviest daily snowfall	20
Deepest snow cover	2

Records on 15 May 1957 by timescale: all-time 1, monthly 5, daily 515.

How Much Records Were Beaten By

422 broken records

Margins by which the 422 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 254.0. Ties are not counted.

Top 20 by Significance

15 May 1957

Top 20 records on 15 May 1957 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
15 May 1957	Hennessey 4 ESE, US	all-time rain	248.4 mm (9.8 in)	121.4 mm (4.8 in)	24 years	73 of 100 (Major)
15 May 1957	Boulder, US	daily rain	53.6 mm (2.1 in)	36.8 mm (1.4 in)	34 years	56 of 100 (Notable)
15 May 1957	Caledonia, US	daily rain	58.2 mm (2.3 in)	39.4 mm (1.6 in)	57 years	56 of 100 (Notable)
15 May 1957	Eureka, US	daily rain	31.0 mm (1.2 in)	23.1 mm (0.9 in)	27 years	51 of 100 (Notable)
15 May 1957	Kherson, UA	daily rain	27.9 mm (1.1 in)	19.3 mm (0.8 in)	43 years	50 of 100 (Notable)
15 May 1957	Penn Yan, US	daily rain	63.5 mm (2.5 in)	29.2 mm (1.1 in)	27 years	50 of 100 (Notable)
15 May 1957	Newberry-Luce Co Rd Commission, US	daily rain	44.7 mm (1.8 in)	28.4 mm (1.1 in)	16 years	49 of 100 (Notable)
15 May 1957	Svirica, RU	daily rain	26.6 mm (1.0 in)	19.2 mm (0.8 in)	7 years	48 of 100 (Notable)
15 May 1957	Kissimmee, US	daily rain	83.8 mm (3.3 in)	45.2 mm (1.8 in)	36 years	43 of 100 (Notable)
15 May 1957	Warren, US	daily rain	39.1 mm (1.5 in)	21.3 mm (0.8 in)	48 years	43 of 100 (Notable)
15 May 1957	Brooksville Chin Hill, US	daily rain	81.3 mm (3.2 in)	35.8 mm (1.4 in)	36 years	40 of 100 (Notable)
15 May 1957	Pembroke Eddy Match, CA	daily low max	7.2 C (45.0 F)	1.7 C (3.1 F)	90 years	38 of 100 (Notable)
15 May 1957	Parker 6 E, US	daily rain	26.7 mm (1.1 in)	18.6 mm (0.7 in)	34 years	38 of 100 (Notable)
15 May 1957	Kekaha 944, US	daily rain	32.0 mm (1.3 in)	28.2 mm (1.1 in)	36 years	38 of 100 (Notable)
15 May 1957	Napa State Hospital, US	daily rain	25.4 mm (1.0 in)	17.5 mm (0.7 in)	15 years	37 of 100 (Notable)
15 May 1957	Silverton, US	daily snowfall	10.2 cm (4.0 in)	10.2 cm (4.0 in)	52 years	37 of 100 (Notable)
15 May 1957	Sable Island, CA	daily low min	-2.2 C (28.0 F)	3.3 C (5.9 F)	50 years	36 of 100 (Notable)
15 May 1957	Monument 2 WSW, US	daily snowfall	24.1 cm (9.5 in)	16.5 cm (6.5 in)	35 years	36 of 100 (Notable)
15 May 1957	Avon Park 2 W, US	daily rain	107.4 mm (4.2 in)	35.0 mm (1.4 in)	36 years	36 of 100 (Notable)
15 May 1957	Plant City, US	monthly rain	88.1 mm (3.5 in)	8.6 mm (0.34 in)	50 years	36 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 1957

Records set or tied on this calendar date in each year from 1820 to 1957. 1957 had 521 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 1957-05-15: 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 2026-10-17 (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	410
50 to 100	6
100 to 150	4
150 to 200	1
200 to 250	0
250 to 300	1