Weather Records on 20 May 1957

728 weather records were set or tied worldwide on 20 May 1957. Highest significance: Twin Falls 3 SE, US.

Key Facts for 20 May 1957

On 20 May 1957, 728 weather records were set or tied at long-record stations worldwide.
37 were record highs and 307 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 18 monthly and 710 daily.
Twin Falls 3 SE set a monthly record daily precipitation of 35.3 mm (1.4 in) on 20 May 1957.
Across 162 earlier years (1802 to 2026) the same calendar date averaged 454 records.

Record Map

728 stations

728 station records on 20 May 1957 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 May 1957: highest significance records shown on the map
Station	Country	Type	Value	Significance
Twin Falls 3 SE	United States	Record daily precipitation	35.3 mm (1.4 in)	61 of 100 (Major)
Cascade 5 S	United States	Record daily precipitation	58.4 mm (2.3 in)	61 of 100 (Major)
Ashley	United States	Record daily precipitation	42.7 mm (1.7 in)	58 of 100 (Notable)
Faulkton	United States	Record daily precipitation	71.6 mm (2.8 in)	58 of 100 (Notable)
San Mateo	United States	Record daily precipitation	28.2 mm (1.1 in)	57 of 100 (Notable)
Ipswich	United States	Record daily precipitation	52.1 mm (2.1 in)	56 of 100 (Notable)
Bainbridge 2 E	United States	Record daily precipitation	51.8 mm (2.0 in)	54 of 100 (Notable)
Bowdle	United States	Record daily precipitation	60.7 mm (2.4 in)	54 of 100 (Notable)
Silverton	United States	Record daily snowfall	22.9 cm (9.0 in)	52 of 100 (Notable)
Coranderrk Badger Weir	Australia	Record daily precipitation	37.8 mm (1.5 in)	49 of 100 (Notable)
Coeur D'Alene	United States	Record daily precipitation	43.2 mm (1.7 in)	49 of 100 (Notable)
Holter Dam	United States	Record daily precipitation	39.6 mm (1.6 in)	48 of 100 (Notable)
Saint Ignatius	United States	Record daily precipitation	42.4 mm (1.7 in)	48 of 100 (Notable)
Jucurutu	Brazil	Record daily precipitation	103.0 mm (4.1 in)	46 of 100 (Notable)
Helena 6 N	United States	Record daily precipitation	40.9 mm (1.6 in)	46 of 100 (Notable)
Karimnagar	India	Record daily precipitation	53.3 mm (2.1 in)	45 of 100 (Notable)
Mineral	United States	Record daily precipitation	55.4 mm (2.2 in)	45 of 100 (Notable)
Deland 1 SSE	United States	Record daily precipitation	90.4 mm (3.6 in)	45 of 100 (Notable)
Ovando	United States	Record daily precipitation	45.7 mm (1.8 in)	45 of 100 (Notable)
Superior	United States	Record daily precipitation	46.7 mm (1.8 in)	45 of 100 (Notable)
Rooipoort	South Africa	Record daily precipitation	37.0 mm (1.5 in)	42 of 100 (Notable)
Haugan 1 W	United States	Record daily precipitation	40.1 mm (1.6 in)	42 of 100 (Notable)
Onaka	United States	Record daily precipitation	46.2 mm (1.8 in)	41 of 100 (Notable)
Hawkesdale (Post Office)	Australia	Record daily precipitation	26.2 mm (1.0 in)	40 of 100 (Notable)
Lowville	United States	Record daily precipitation	44.7 mm (1.8 in)	40 of 100 (Notable)
Leola	United States	Record daily precipitation	43.9 mm (1.7 in)	40 of 100 (Notable)
Geneva Exp STN	United States	Record daily precipitation	45.7 mm (1.8 in)	39 of 100 (Notable)
Pollock	United States	Record daily precipitation	35.1 mm (1.4 in)	39 of 100 (Notable)
Riverdale	United States	Record daily precipitation	37.3 mm (1.5 in)	38 of 100 (Notable)
Clifton Forge 2 NW	United States	Record daily precipitation	72.4 mm (2.9 in)	38 of 100 (Notable)
Chewelah	United States	Record daily precipitation	27.9 mm (1.1 in)	38 of 100 (Notable)
Newport	United States	Record daily precipitation	34.3 mm (1.4 in)	38 of 100 (Notable)
Caico	Brazil	Record daily precipitation	65.2 mm (2.6 in)	37 of 100 (Notable)
Pagosa Springs 1SE	United States	Record daily snowfall	10.2 cm (4.0 in)	37 of 100 (Notable)
Rico	United States	Record daily snowfall	17.8 cm (7.0 in)	37 of 100 (Notable)
Macedon Lock E30	United States	Record daily precipitation	35.6 mm (1.4 in)	37 of 100 (Notable)
Eureka	United States	Record daily precipitation	33.8 mm (1.3 in)	37 of 100 (Notable)
Avery Rs	United States	Record daily precipitation	47.5 mm (1.9 in)	36 of 100 (Notable)
Trout Creek 2 W	United States	Record daily precipitation	29.0 mm (1.1 in)	36 of 100 (Notable)
Highmarket 2W	United States	Record daily precipitation	46.0 mm (1.8 in)	36 of 100 (Notable)
New Berlin	United States	Record daily precipitation	27.9 mm (1.1 in)	36 of 100 (Notable)
Pilanesberg-Pol	South Africa	Record daily precipitation	31.5 mm (1.2 in)	35 of 100 (Notable)
Orofino	United States	Record daily precipitation	27.9 mm (1.1 in)	35 of 100 (Notable)
Mellette 4 W	United States	Record daily precipitation	34.3 mm (1.4 in)	35 of 100 (Notable)
Silvan State School	Australia	Record daily precipitation	41.1 mm (1.6 in)	34 of 100 (Routine)
Dartmoor	Australia	Record daily precipitation	26.7 mm (1.1 in)	34 of 100 (Routine)
Ovando	United States	Record daily snowfall	6.4 cm (2.5 in)	34 of 100 (Routine)
Hemlock	United States	Record daily precipitation	39.9 mm (1.6 in)	34 of 100 (Routine)
Hamilton	United States	Record daily precipitation	33.8 mm (1.3 in)	33 of 100 (Routine)
Belleville Dam 2O	United States	Record daily precipitation	44.7 mm (1.8 in)	33 of 100 (Routine)
Steppes (Old Post Office)	Australia	Record daily precipitation	38.4 mm (1.5 in)	32 of 100 (Routine)
Rjazan	Russia	Record daily precipitation	50.0 mm (2.0 in)	32 of 100 (Routine)
Polson	United States	Record daily precipitation	31.0 mm (1.2 in)	32 of 100 (Routine)
Pierson	Canada	Record daily precipitation	41.9 mm (1.6 in)	31 of 100 (Routine)
Davangire	India	Record daily precipitation	104.1 mm (4.1 in)	31 of 100 (Routine)
Premier Mine-Cullinan	South Africa	Record daily precipitation	38.2 mm (1.5 in)	31 of 100 (Routine)
Vacaville	United States	Record low maximum temperature	12.8 C (55.0 F)	31 of 100 (Routine)
Gunnison 3SW	United States	Record low maximum temperature	5.6 C (42.1 F)	31 of 100 (Routine)
Pierce Rs	United States	Record daily precipitation	53.3 mm (2.1 in)	31 of 100 (Routine)
Missoula 6 NW WFO	United States	Record daily precipitation	41.4 mm (1.6 in)	31 of 100 (Routine)

Counts by Type and Timescale

728 records

Records set or tied on 20 May 1957 by type: Highest daily maximum 11, Lowest daily maximum 277, Highest daily minimum 26, Lowest daily minimum 30, Heaviest daily rainfall 367, Heaviest daily snowfall 14, Deepest snow cover 3.

Records on 20 May 1957 by type
Record type	Records
Highest daily maximum	11
Lowest daily maximum	277
Highest daily minimum	26
Lowest daily minimum	30
Heaviest daily rainfall	367
Heaviest daily snowfall	14
Deepest snow cover	3

Records on 20 May 1957 by timescale: all-time 0, monthly 18, daily 710.

How Much Records Were Beaten By

603 broken records

Margins by which the 603 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 204.0. Ties are not counted.

Top 20 by Significance

20 May 1957

Top 20 records on 20 May 1957 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 May 1957	Twin Falls 3 SE, US	monthly rain	35.3 mm (1.4 in)	16.5 mm (0.6 in)	29 years	61 of 100 (Major)
20 May 1957	Cascade 5 S, US	daily rain	58.4 mm (2.3 in)	41.1 mm (1.6 in)	50 years	61 of 100 (Major)
20 May 1957	Ashley, US	daily rain	42.7 mm (1.7 in)	30.0 mm (1.2 in)	60 years	58 of 100 (Notable)
20 May 1957	Faulkton, US	daily rain	71.6 mm (2.8 in)	49.5 mm (1.9 in)	40 years	58 of 100 (Notable)
20 May 1957	San Mateo, US	daily rain	28.2 mm (1.1 in)	20.6 mm (0.8 in)	44 years	57 of 100 (Notable)
20 May 1957	Ipswich, US	daily rain	52.1 mm (2.1 in)	40.4 mm (1.6 in)	58 years	56 of 100 (Notable)
20 May 1957	Bainbridge 2 E, US	daily rain	51.8 mm (2.0 in)	32.2 mm (1.3 in)	35 years	54 of 100 (Notable)
20 May 1957	Bowdle, US	daily rain	60.7 mm (2.4 in)	34.0 mm (1.3 in)	58 years	54 of 100 (Notable)
20 May 1957	Silverton, US	daily snowfall	22.9 cm (9.0 in)	20.4 cm (8.0 in)	42 years	52 of 100 (Notable)
20 May 1957	Coranderrk Badger Weir, AU	daily rain	37.8 mm (1.5 in)	25.4 mm (1.0 in)	40 years	49 of 100 (Notable)
20 May 1957	Coeur D'Alene, US	daily rain	43.2 mm (1.7 in)	21.9 mm (0.9 in)	27 years	49 of 100 (Notable)
20 May 1957	Holter Dam, US	daily rain	39.6 mm (1.6 in)	22.3 mm (0.9 in)	50 years	48 of 100 (Notable)
20 May 1957	Saint Ignatius, US	daily rain	42.4 mm (1.7 in)	24.9 mm (1.0 in)	8 years	48 of 100 (Notable)
20 May 1957	Jucurutu, BR	daily rain	103.0 mm (4.1 in)	81.0 mm (3.2 in)	8 years	46 of 100 (Notable)
20 May 1957	Helena 6 N, US	daily rain	40.9 mm (1.6 in)	39.4 mm (1.6 in)	12 years	46 of 100 (Notable)
20 May 1957	Karimnagar, IN	daily rain	53.3 mm (2.1 in)	44.4 mm (1.7 in)	2 years	45 of 100 (Notable)
20 May 1957	Mineral, US	daily rain	55.4 mm (2.2 in)	41.9 mm (1.6 in)	4 years	45 of 100 (Notable)
20 May 1957	Deland 1 SSE, US	daily rain	90.4 mm (3.6 in)	43.7 mm (1.7 in)	28 years	45 of 100 (Notable)
20 May 1957	Ovando, US	daily rain	45.7 mm (1.8 in)	15.0 mm (0.6 in)	55 years	45 of 100 (Notable)
20 May 1957	Superior, US	monthly rain	46.7 mm (1.8 in)	14.7 mm (0.6 in)	14 years	45 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 1957

Records set or tied on this calendar date in each year from 1802 to 1957. 1957 had 728 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 1957-05-20: 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	595
50 to 100	6
100 to 150	0
150 to 200	1
200 to 250	1