Weather Records on 1 May 1977

545 weather records were set or tied worldwide on 1 May 1977. Highest significance: Sao Jose Do Egito, BR.

Key Facts for 1 May 1977

On 1 May 1977, 545 weather records were set or tied at long-record stations worldwide.
242 were record highs and 81 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 28 monthly and 516 daily.
Sao Jose Do Egito set a monthly record daily precipitation of 107.2 mm (4.2 in) on 1 May 1977.
Across 165 earlier years (1795 to 2026) the same calendar date averaged 442 records.

Record Map

545 stations

545 station records on 1 May 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 1 May 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Sao Jose Do Egito	Brazil	Record daily precipitation	107.2 mm (4.2 in)	64 of 100 (Major)
Hecla	United States	Record daily precipitation	45.2 mm (1.8 in)	64 of 100 (Major)
Clyde A	Canada	Record daily snowfall	23.7 cm (9.3 in)	55 of 100 (Notable)
Cheyenne	United States	Record daily precipitation	37.8 mm (1.5 in)	55 of 100 (Notable)
Lodi	United States	Record daily precipitation	26.4 mm (1.0 in)	51 of 100 (Notable)
Gullspang	Sweden	Record daily precipitation	34.7 mm (1.4 in)	50 of 100 (Notable)
Olivedos (Sao Francisco)	Brazil	Record daily precipitation	46.0 mm (1.8 in)	49 of 100 (Notable)
Genoa	United States	Record daily precipitation	43.9 mm (1.7 in)	49 of 100 (Notable)
Bethel AP	United States	Record snow depth	50.8 cm (20.0 in)	49 of 100 (Notable)
Sao Caetano	Brazil	Record daily precipitation	29.2 mm (1.1 in)	47 of 100 (Notable)
Warruwi	Australia	Record daily precipitation	34.8 mm (1.4 in)	45 of 100 (Notable)
Cristais	Brazil	Record daily precipitation	88.0 mm (3.5 in)	45 of 100 (Notable)
Pedra Lavrada	Brazil	Record daily precipitation	50.0 mm (2.0 in)	45 of 100 (Notable)
Palmares	Brazil	Record daily precipitation	90.6 mm (3.6 in)	45 of 100 (Notable)
Velikie Luki	Russia	Record high maximum temperature	31.2 C (88.2 F)	45 of 100 (Notable)
Tracy Carbona	United States	Record daily precipitation	30.0 mm (1.2 in)	45 of 100 (Notable)
Caraubas (Caraibeiras)	Brazil	Record daily precipitation	74.1 mm (2.9 in)	44 of 100 (Notable)
Nova Olinda (Andreza)	Brazil	Record daily precipitation	220.3 mm (8.7 in)	43 of 100 (Notable)
Georgetown Rs	United States	Record daily precipitation	41.4 mm (1.6 in)	41 of 100 (Notable)
Colfax	United States	Record daily precipitation	47.2 mm (1.9 in)	39 of 100 (Notable)
Kvikkjokk-Arrenjarka	Sweden	Record snow depth	98.0 cm (38.6 in)	38 of 100 (Notable)
Penedo	Brazil	Record daily precipitation	89.0 mm (3.5 in)	37 of 100 (Notable)
Velikie Luki	Russia	Record high minimum temperature	13.0 C (55.4 F)	37 of 100 (Notable)
Arlington	United States	Record high minimum temperature	14.4 C (57.9 F)	37 of 100 (Notable)
Childs	United States	Record high minimum temperature	20.6 C (69.1 F)	36 of 100 (Notable)
Picos	Brazil	Record daily precipitation	38.6 mm (1.5 in)	35 of 100 (Notable)
Imaculada	Brazil	Record daily precipitation	75.0 mm (3.0 in)	35 of 100 (Notable)
Clover Valley	United States	Record high minimum temperature	5.6 C (42.1 F)	35 of 100 (Notable)
Timbauba	Brazil	Record daily precipitation	75.0 mm (3.0 in)	34 of 100 (Routine)
Kalispell Glacier AP	United States	Record high minimum temperature	10.6 C (51.1 F)	34 of 100 (Routine)
Beaumont City	United States	Record daily precipitation	55.9 mm (2.2 in)	34 of 100 (Routine)
Goodland	United States	Record daily precipitation	40.6 mm (1.6 in)	34 of 100 (Routine)
Valdez WSO	United States	Record snow depth	129.5 cm (51.0 in)	34 of 100 (Routine)
Victoria Gonzales Hts	Canada	Record high minimum temperature	11.7 C (53.1 F)	33 of 100 (Routine)
Tapalpa (Smn)	Mexico	Record low minimum temperature	0.6 C (33.1 F)	33 of 100 (Routine)
Galeana (Smn)	Mexico	Record high minimum temperature	23.9 C (75.0 F)	33 of 100 (Routine)
Sveg	Sweden	Record snow depth	56.0 cm (22.0 in)	33 of 100 (Routine)
Durango	United States	Record high minimum temperature	5.6 C (42.1 F)	33 of 100 (Routine)
Bernalillo	United States	Record high minimum temperature	11.1 C (52.0 F)	33 of 100 (Routine)
Heppner	United States	Record high minimum temperature	11.1 C (52.0 F)	33 of 100 (Routine)
Princesa Isabel	Brazil	Record daily precipitation	71.0 mm (2.8 in)	32 of 100 (Routine)
Grouse	United States	Record daily snowfall	7.6 cm (3.0 in)	32 of 100 (Routine)
Double Four Rch	United States	Record daily precipitation	33.0 mm (1.3 in)	32 of 100 (Routine)
Jardim de Angicos	Brazil	Record daily precipitation	41.6 mm (1.6 in)	31 of 100 (Routine)
Barra de Santa Rosa	Brazil	Record daily precipitation	35.4 mm (1.4 in)	31 of 100 (Routine)
Fiddletown Dexter Rch	United States	Record daily precipitation	30.5 mm (1.2 in)	31 of 100 (Routine)
Nevada City	United States	Record daily precipitation	49.5 mm (1.9 in)	31 of 100 (Routine)
Pedro Velho (Dnocs)	Brazil	Record daily precipitation	34.2 mm (1.3 in)	30 of 100 (Routine)
Talbotton	United States	Record high minimum temperature	22.2 C (72.0 F)	30 of 100 (Routine)
Conconully	United States	Record high minimum temperature	10.6 C (51.1 F)	30 of 100 (Routine)
Superior	United States	Record high minimum temperature	12.8 C (55.0 F)	30 of 100 (Routine)
Lagarto	Brazil	Record daily precipitation	36.0 mm (1.4 in)	29 of 100 (Routine)
Sussex	Canada	Record low minimum temperature	-7.2 C (19.0 F)	29 of 100 (Routine)
Pocinhos (Joffily)	Brazil	Record daily precipitation	25.1 mm (1.0 in)	28 of 100 (Routine)
Nappan Cda	Canada	Record low minimum temperature	-6.7 C (19.9 F)	28 of 100 (Routine)
Castle Rock	United States	Record high minimum temperature	8.3 C (46.9 F)	28 of 100 (Routine)
Fleming	United States	Record daily precipitation	31.5 mm (1.2 in)	28 of 100 (Routine)
Bay City Wtr Wks	United States	Record low maximum temperature	22.2 C (72.0 F)	28 of 100 (Routine)
Greenwood	Canada	Record high minimum temperature	8.3 C (46.9 F)	27 of 100 (Routine)
Baia Mare	Romania	Record high minimum temperature	17.7 C (63.9 F)	27 of 100 (Routine)

Counts by Type and Timescale

545 records

Records set or tied on 1 May 1977 by type: Highest daily maximum 81, Lowest daily maximum 17, Highest daily minimum 161, Lowest daily minimum 64, Heaviest daily rainfall 208, Heaviest daily snowfall 6, Deepest snow cover 8.

Records on 1 May 1977 by type
Record type	Records
Highest daily maximum	81
Lowest daily maximum	17
Highest daily minimum	161
Lowest daily minimum	64
Heaviest daily rainfall	208
Heaviest daily snowfall	6
Deepest snow cover	8

Records on 1 May 1977 by timescale: all-time 1, monthly 28, daily 516.

How Much Records Were Beaten By

437 broken records

Margins by which the 437 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 279.0. Ties are not counted.

Top 20 by Significance

1 May 1977

Top 20 records on 1 May 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
1 May 1977	Sao Jose Do Egito, BR	monthly rain	107.2 mm (4.2 in)	40.7 mm (1.6 in)	58 years	64 of 100 (Major)
1 May 1977	Hecla, US	daily rain	45.2 mm (1.8 in)	29.5 mm (1.2 in)	67 years	64 of 100 (Major)
1 May 1977	Clyde A, CA	monthly snowfall	23.7 cm (9.3 in)	11.3 cm (4.4 in)	5 years	55 of 100 (Notable)
1 May 1977	Cheyenne, US	daily rain	37.8 mm (1.5 in)	29.2 mm (1.1 in)	31 years	55 of 100 (Notable)
1 May 1977	Lodi, US	daily rain	26.4 mm (1.0 in)	15.2 mm (0.6 in)	76 years	51 of 100 (Notable)
1 May 1977	Gullspang, SE	daily rain	34.7 mm (1.4 in)	22.2 mm (0.9 in)	26 years	50 of 100 (Notable)
1 May 1977	Olivedos (Sao Francisco), BR	daily rain	46.0 mm (1.8 in)	35.3 mm (1.4 in)	35 years	49 of 100 (Notable)
1 May 1977	Genoa, US	daily rain	43.9 mm (1.7 in)	35.8 mm (1.4 in)	23 years	49 of 100 (Notable)
1 May 1977	Bethel AP, US	monthly snow depth	50.8 cm (20.0 in)	20.3 cm (8.0 in)	22 years	49 of 100 (Notable)
1 May 1977	Sao Caetano, BR	daily rain	29.2 mm (1.1 in)	12.2 mm (0.5 in)	60 years	47 of 100 (Notable)
1 May 1977	Warruwi, AU	daily rain	34.8 mm (1.4 in)	28.2 mm (1.1 in)	20 years	45 of 100 (Notable)
1 May 1977	Cristais, BR	daily rain	88.0 mm (3.5 in)	51.8 mm (2.0 in)	4 years	45 of 100 (Notable)
1 May 1977	Pedra Lavrada, BR	daily rain	50.0 mm (2.0 in)	28.7 mm (1.1 in)	4 years	45 of 100 (Notable)
1 May 1977	Palmares, BR	daily rain	90.6 mm (3.6 in)	52.3 mm (2.1 in)	24 years	45 of 100 (Notable)
1 May 1977	Velikie Luki, RU	daily high max	31.2 C (88.2 F)	5.7 C (10.3 F)	86 years	45 of 100 (Notable)
1 May 1977	Tracy Carbona, US	monthly rain	30.0 mm (1.2 in)	10.7 mm (0.4 in)	18 years	45 of 100 (Notable)
1 May 1977	Caraubas (Caraibeiras), BR	monthly rain	74.1 mm (2.9 in)	19.1 mm (0.8 in)	42 years	44 of 100 (Notable)
1 May 1977	Nova Olinda (Andreza), BR	all-time rain	220.3 mm (8.7 in)	24.3 mm (1.0 in)	13 years	43 of 100 (Notable)
1 May 1977	Georgetown Rs, US	daily rain	41.4 mm (1.6 in)	31.0 mm (1.2 in)	27 years	41 of 100 (Notable)
1 May 1977	Colfax, US	daily rain	47.2 mm (1.9 in)	25.6 mm (1.0 in)	43 years	39 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

1795 to 1977

Records set or tied on this calendar date in each year from 1795 to 1977. 1977 had 545 records.

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

Records on 05-01 in each year
Year	Records
1795	1
1802	1
1804	1
1814	1
1818	1
1835	1
1836	1
1840	1
1846	2
1847	1
1850	1
1851	1
1857	1
1860	1
1861	1
1864	2
1865	1
1868	2
1872	1
1875	4
1878	2
1879	2
1880	3
1881	2
1884	1
1885	1
1886	2
1887	2
1888	2
1889	3
1890	2
1891	5
1892	6
1893	2
1894	5
1896	1
1897	4
1898	1
1899	8
1900	1
1901	5
1902	7
1903	9
1904	9
1905	13
1906	12
1907	31
1908	20
1909	49
1910	13
1911	22
1912	18
1913	54
1914	23
1915	27
1916	27
1917	37
1918	34
1919	150
1920	186
1921	41
1922	92
1923	64
1924	63
1925	118
1926	500
1927	125
1928	190
1929	142
1930	263
1931	537
1932	220
1933	706
1934	305
1935	276
1936	368
1937	218
1938	304
1939	227
1940	731
1941	333
1942	1,036
1943	526
1944	229
1945	350
1946	415
1947	655
1948	774
1949	405
1950	439
1951	894
1952	557
1953	917
1954	1,506
1955	772
1956	1,106
1957	359
1958	448
1959	764
1960	737
1961	588
1962	615
1963	704
1964	312
1965	360
1966	707
1967	948
1968	426
1969	429
1970	1,075
1971	444
1972	562
1973	841
1974	589
1975	286
1976	673
1977	545
1978	1,202
1979	612
1980	507
1981	1,265
1982	508
1983	1,423
1984	640
1985	789
1986	512
1987	1,098
1988	1,058
1989	949
1990	922
1991	633
1992	1,201
1993	1,101
1994	1,210
1995	1,365
1996	1,439
1997	804
1998	951
1999	932
2000	809
2001	1,106
2002	1,221
2003	964
2004	887
2005	1,320
2006	734
2007	857
2008	979
2009	679
2010	1,151
2011	716
2012	796
2013	976
2014	941
2015	550
2016	844
2017	1,163
2018	519
2019	788
2020	1,099
2021	834
2022	319
2023	912
2024	458
2025	430
2026	623

Download the Data

Data for records on 1977-05-01: 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	428
50 to 100	5
100 to 150	2
150 to 200	0
200 to 250	1
250 to 300	1