Weather Records on 20 May 1977

553 weather records were set or tied worldwide on 20 May 1977. Highest significance: Manhattan, US.

Key Facts for 20 May 1977

On 20 May 1977, 553 weather records were set or tied at long-record stations worldwide.
243 were record highs and 90 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 21 monthly and 532 daily.
Manhattan set a daily record precipitation of 121.4 mm (4.8 in) on 20 May 1977.
Across 162 earlier years (1802 to 2026) the same calendar date averaged 455 records.

Record Map

553 stations

553 station records on 20 May 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 May 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Manhattan	United States	Record daily precipitation	121.4 mm (4.8 in)	67 of 100 (Major)
Mc Farland	United States	Record daily precipitation	66.3 mm (2.6 in)	59 of 100 (Notable)
Sao Jose Do Belmonte	Brazil	Record daily precipitation	105.0 mm (4.1 in)	57 of 100 (Notable)
Edgerton	United States	Record daily precipitation	100.3 mm (3.9 in)	57 of 100 (Notable)
Duncan	United States	Record daily precipitation	128.3 mm (5.1 in)	54 of 100 (Notable)
Horton	United States	Record daily precipitation	119.4 mm (4.7 in)	47 of 100 (Notable)
Dunbar Forest Exp STN	United States	Record daily precipitation	45.2 mm (1.8 in)	47 of 100 (Notable)
Westmoreland	United States	Record daily precipitation	78.5 mm (3.1 in)	46 of 100 (Notable)
Emmett	United States	Record daily precipitation	75.4 mm (3.0 in)	45 of 100 (Notable)
Quedlinburg	Germany	Record daily precipitation	34.0 mm (1.3 in)	44 of 100 (Notable)
Paso de San Antonio	Mexico	Record daily precipitation	53.8 mm (2.1 in)	44 of 100 (Notable)
Wamego 4 W	United States	Record daily precipitation	73.9 mm (2.9 in)	43 of 100 (Notable)
Golden Valley	Australia	Record daily precipitation	29.6 mm (1.2 in)	42 of 100 (Notable)
Japaratuba	Brazil	Record daily precipitation	100.3 mm (3.9 in)	42 of 100 (Notable)
Moltema (Craythorne)	Australia	Record daily precipitation	32.0 mm (1.3 in)	41 of 100 (Notable)
Limoeiro de Anadia	Brazil	Record daily precipitation	144.9 mm (5.7 in)	41 of 100 (Notable)
Hillwood (Hillwoodville)	Australia	Record daily precipitation	36.6 mm (1.4 in)	40 of 100 (Notable)
Major Isidoro (Sertaozinho)	Brazil	Record daily precipitation	87.1 mm (3.4 in)	40 of 100 (Notable)
Celle (Stadt)	Germany	Record daily precipitation	31.6 mm (1.2 in)	40 of 100 (Notable)
Eldorado Springs	United States	Record daily precipitation	60.2 mm (2.4 in)	40 of 100 (Notable)
Oregon	United States	Record daily precipitation	57.2 mm (2.3 in)	40 of 100 (Notable)
Aracati	Brazil	Record daily precipitation	50.3 mm (2.0 in)	39 of 100 (Notable)
Herford	Germany	Record daily precipitation	28.1 mm (1.1 in)	39 of 100 (Notable)
Harveyville	United States	Record daily precipitation	54.6 mm (2.1 in)	39 of 100 (Notable)
Lucknow	Canada	Record high maximum temperature	30.6 C (87.1 F)	37 of 100 (Notable)
Ft Pierce	United States	Record low minimum temperature	13.9 C (57.0 F)	37 of 100 (Notable)
Holton	United States	Record daily precipitation	52.3 mm (2.1 in)	37 of 100 (Notable)
Bosque del Apache	United States	Record low maximum temperature	20.0 C (68.0 F)	37 of 100 (Notable)
Meeker 5 W	United States	Record daily precipitation	74.2 mm (2.9 in)	37 of 100 (Notable)
Brocken	Germany	Record daily precipitation	27.0 mm (1.1 in)	36 of 100 (Notable)
Jungapeo	Mexico	Record daily precipitation	49.8 mm (2.0 in)	36 of 100 (Notable)
Vevay	United States	Record high maximum temperature	33.3 C (91.9 F)	36 of 100 (Notable)
Harrisonville	United States	Record daily precipitation	33.3 mm (1.3 in)	36 of 100 (Notable)
Wichita Mtn Wr	United States	Record daily precipitation	71.1 mm (2.8 in)	36 of 100 (Notable)
Serra Grande (Ibitirucu)	Brazil	Record daily precipitation	47.1 mm (1.9 in)	35 of 100 (Notable)
Prince Albert A	Canada	Record daily precipitation	28.9 mm (1.1 in)	35 of 100 (Notable)
Feodosiia	Ukraine	Record high minimum temperature	19.0 C (66.2 F)	35 of 100 (Notable)
Gridley	United States	Record daily precipitation	35.6 mm (1.4 in)	35 of 100 (Notable)
San Marcos	United States	Record daily precipitation	45.2 mm (1.8 in)	35 of 100 (Notable)
Aguililla	Mexico	Record daily precipitation	42.7 mm (1.7 in)	34 of 100 (Routine)
St. Petersburg	Russia	Record daily precipitation	31.2 mm (1.2 in)	34 of 100 (Routine)
Saint Paul	United States	Record daily precipitation	34.0 mm (1.3 in)	34 of 100 (Routine)
Mt Airy 2 W	United States	Record high minimum temperature	18.3 C (64.9 F)	33 of 100 (Routine)
Crosbyton	United States	Record daily precipitation	38.1 mm (1.5 in)	33 of 100 (Routine)
Floydada	United States	Record daily precipitation	28.2 mm (1.1 in)	33 of 100 (Routine)
Caveside	Australia	Record daily precipitation	38.0 mm (1.5 in)	32 of 100 (Routine)
Griggsville	United States	Record high minimum temperature	21.7 C (71.1 F)	32 of 100 (Routine)
Osage City	United States	Record daily precipitation	46.2 mm (1.8 in)	32 of 100 (Routine)
Overbrook 5 SE	United States	Record daily precipitation	35.8 mm (1.4 in)	32 of 100 (Routine)
Anadarko 3 E	United States	Record daily precipitation	69.6 mm (2.7 in)	32 of 100 (Routine)
Tara (Santo Antonio Do Tara)	Brazil	Record daily precipitation	47.2 mm (1.9 in)	31 of 100 (Routine)
Nicosia	Cyprus	Record high minimum temperature	19.8 C (67.6 F)	31 of 100 (Routine)
Anchorage	United States	Record high maximum temperature	32.8 C (91.0 F)	31 of 100 (Routine)
Lilydale Post Office	Australia	Record daily precipitation	28.6 mm (1.1 in)	30 of 100 (Routine)
Roosevelt 1 S	United States	Record low minimum temperature	8.9 C (48.0 F)	30 of 100 (Routine)
Cedar Rapids #1	United States	Record daily precipitation	54.6 mm (2.1 in)	30 of 100 (Routine)
Hart 3 WSW	United States	Record high maximum temperature	31.1 C (88.0 F)	30 of 100 (Routine)
Carnegie 5 NE	United States	Record daily precipitation	37.1 mm (1.5 in)	30 of 100 (Routine)
Sheboygan	United States	Record high minimum temperature	13.9 C (57.0 F)	30 of 100 (Routine)
Manistee 3SE	United States	Record high maximum temperature	32.2 C (90.0 F)	29 of 100 (Routine)

Counts by Type and Timescale

553 records

Records set or tied on 20 May 1977 by type: Highest daily maximum 138, Lowest daily maximum 38, Highest daily minimum 105, Lowest daily minimum 52, Heaviest daily rainfall 219, Heaviest daily snowfall 1.

Records on 20 May 1977 by type
Record type	Records
Highest daily maximum	138
Lowest daily maximum	38
Highest daily minimum	105
Lowest daily minimum	52
Heaviest daily rainfall	219
Heaviest daily snowfall	1
Deepest snow cover	0

Records on 20 May 1977 by timescale: all-time 0, monthly 21, daily 532.

How Much Records Were Beaten By

429 broken records

Margins by which the 429 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 103.4. Ties are not counted.

Top 20 by Significance

20 May 1977

Top 20 records on 20 May 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 May 1977	Manhattan, US	daily rain	121.4 mm (4.8 in)	103.4 mm (4.1 in)	64 years	67 of 100 (Major)
20 May 1977	Mc Farland, US	daily rain	66.3 mm (2.6 in)	51.1 mm (2.0 in)	58 years	59 of 100 (Notable)
20 May 1977	Sao Jose Do Belmonte, BR	monthly rain	105.0 mm (4.1 in)	32.7 mm (1.3 in)	42 years	57 of 100 (Notable)
20 May 1977	Edgerton, US	daily rain	100.3 mm (3.9 in)	65.8 mm (2.6 in)	42 years	57 of 100 (Notable)
20 May 1977	Duncan, US	daily rain	128.3 mm (5.1 in)	99.3 mm (3.9 in)	36 years	54 of 100 (Notable)
20 May 1977	Horton, US	monthly rain	119.4 mm (4.7 in)	15.3 mm (0.6 in)	61 years	47 of 100 (Notable)
20 May 1977	Dunbar Forest Exp STN, US	daily rain	45.2 mm (1.8 in)	37.6 mm (1.5 in)	15 years	47 of 100 (Notable)
20 May 1977	Westmoreland, US	daily rain	78.5 mm (3.1 in)	46.2 mm (1.8 in)	15 years	46 of 100 (Notable)
20 May 1977	Emmett, US	daily rain	75.4 mm (3.0 in)	43.9 mm (1.7 in)	16 years	45 of 100 (Notable)
20 May 1977	Quedlinburg, DE	daily rain	34.0 mm (1.3 in)	27.0 mm (1.1 in)	6 years	44 of 100 (Notable)
20 May 1977	Paso de San Antonio, MX	daily rain	53.8 mm (2.1 in)	34.0 mm (1.3 in)	32 years	44 of 100 (Notable)
20 May 1977	Wamego 4 W, US	daily rain	73.9 mm (2.9 in)	41.6 mm (1.6 in)	16 years	43 of 100 (Notable)
20 May 1977	Golden Valley, AU	daily rain	29.6 mm (1.2 in)	18.9 mm (0.7 in)	59 years	42 of 100 (Notable)
20 May 1977	Japaratuba, BR	daily rain	100.3 mm (3.9 in)	54.0 mm (2.1 in)	28 years	42 of 100 (Notable)
20 May 1977	Moltema (Craythorne), AU	daily rain	32.0 mm (1.3 in)	21.8 mm (0.9 in)	38 years	41 of 100 (Notable)
20 May 1977	Limoeiro de Anadia, BR	monthly rain	144.9 mm (5.7 in)	9.1 mm (0.36 in)	63 years	41 of 100 (Notable)
20 May 1977	Hillwood (Hillwoodville), AU	daily rain	36.6 mm (1.4 in)	21.6 mm (0.9 in)	40 years	40 of 100 (Notable)
20 May 1977	Major Isidoro (Sertaozinho), BR	monthly rain	87.1 mm (3.4 in)	18.7 mm (0.7 in)	10 years	40 of 100 (Notable)
20 May 1977	Celle (Stadt), DE	daily rain	31.6 mm (1.2 in)	19.6 mm (0.8 in)	8 years	40 of 100 (Notable)
20 May 1977	Eldorado Springs, US	daily rain	60.2 mm (2.4 in)	35.8 mm (1.4 in)	30 years	40 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 1977

Records set or tied on this calendar date in each year from 1802 to 1977. 1977 had 553 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 1977-05-20: 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 20	395
20 to 40	24
40 to 60	7
60 to 80	1
80 to 100	1
100 to 120	1