Weather Records on 7 May 1977

662 weather records were set or tied worldwide on 7 May 1977. Highest significance: Grahamstown, ZA.

Key Facts for 7 May 1977

On 7 May 1977, 662 weather records were set or tied at long-record stations worldwide.
177 were record highs and 138 were record lows, counting maximum and minimum temperature.
By timescale, 7 were all-time records, 25 monthly and 630 daily.
Grahamstown set a daily record precipitation of 95.0 mm (3.7 in) on 7 May 1977.
Across 168 earlier years (1795 to 2026) the same calendar date averaged 417 records.

Record Map

662 stations

662 station records on 7 May 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 7 May 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Grahamstown	South Africa	Record daily precipitation	95.0 mm (3.7 in)	76 of 100 (Major)
Humansdorp (Pol)	South Africa	Record daily precipitation	92.0 mm (3.6 in)	75 of 100 (Major)
Roodebloem	South Africa	Record daily precipitation	123.0 mm (4.8 in)	73 of 100 (Major)
Jansenville	South Africa	Record daily precipitation	104.0 mm (4.1 in)	70 of 100 (Major)
Cullendale	South Africa	Record daily precipitation	60.2 mm (2.4 in)	70 of 100 (Major)
Fir Glen	South Africa	Record daily precipitation	70.0 mm (2.8 in)	69 of 100 (Major)
Uitkomst	South Africa	Record daily precipitation	136.5 mm (5.4 in)	69 of 100 (Major)
Pearston (Pol)	South Africa	Record daily precipitation	68.0 mm (2.7 in)	69 of 100 (Major)
Goudveld (Bos)	South Africa	Record daily precipitation	83.0 mm (3.3 in)	68 of 100 (Major)
Aberdeen (Tnk)	South Africa	Record daily precipitation	54.0 mm (2.1 in)	66 of 100 (Major)
Purdum	United States	Record daily precipitation	123.7 mm (4.9 in)	65 of 100 (Major)
Somerset East	South Africa	Record daily precipitation	76.0 mm (3.0 in)	64 of 100 (Major)
Winterhoek	South Africa	Record daily precipitation	67.0 mm (2.6 in)	63 of 100 (Major)
Fort Beaufort	South Africa	Record daily precipitation	33.5 mm (1.3 in)	62 of 100 (Major)
Rocklands	South Africa	Record daily precipitation	35.5 mm (1.4 in)	62 of 100 (Major)
Adelaide (Pol)	South Africa	Record daily precipitation	47.0 mm (1.9 in)	59 of 100 (Notable)
Humula (Rylands)	Australia	Record daily precipitation	40.0 mm (1.6 in)	58 of 100 (Notable)
Albertvale	South Africa	Record daily precipitation	38.5 mm (1.5 in)	57 of 100 (Notable)
Houd Constant	South Africa	Record daily precipitation	125.0 mm (4.9 in)	57 of 100 (Notable)
Tafelberg Hall	South Africa	Record daily precipitation	30.5 mm (1.2 in)	57 of 100 (Notable)
Knysna (Tnk)	South Africa	Record daily precipitation	75.0 mm (3.0 in)	54 of 100 (Notable)
Kendrew Estates	South Africa	Record daily precipitation	105.5 mm (4.2 in)	54 of 100 (Notable)
Struishoek	South Africa	Record daily precipitation	73.5 mm (2.9 in)	54 of 100 (Notable)
Cape St. Francis	South Africa	Record daily precipitation	45.0 mm (1.8 in)	53 of 100 (Notable)
Steytlerville (Mag)	South Africa	Record daily precipitation	37.5 mm (1.5 in)	53 of 100 (Notable)
Clifton	South Africa	Record daily precipitation	58.5 mm (2.3 in)	53 of 100 (Notable)
Nitchequon	Canada	Record daily snowfall	16.0 cm (6.3 in)	51 of 100 (Notable)
Prospect	South Africa	Record daily precipitation	70.0 mm (2.8 in)	51 of 100 (Notable)
Alexandria (Pol)	South Africa	Record daily precipitation	63.0 mm (2.5 in)	50 of 100 (Notable)
Lorraine	South Africa	Record daily precipitation	62.0 mm (2.4 in)	50 of 100 (Notable)
The Mills	South Africa	Record daily precipitation	51.6 mm (2.0 in)	50 of 100 (Notable)
Grootfontein 11,	South Africa	Record daily precipitation	29.4 mm (1.2 in)	50 of 100 (Notable)
Bathurst Ns,	South Africa	Record daily precipitation	114.5 mm (4.5 in)	49 of 100 (Notable)
Oukraal	South Africa	Record daily precipitation	51.0 mm (2.0 in)	49 of 100 (Notable)
Cuatro Cienegas (Smn)	Mexico	Record daily precipitation	27.9 mm (1.1 in)	48 of 100 (Notable)
Wolwefontein (Pol)	South Africa	Record daily precipitation	80.0 mm (3.1 in)	47 of 100 (Notable)
Lekkervlei	South Africa	Record daily precipitation	33.0 mm (1.3 in)	47 of 100 (Notable)
De Doorns	South Africa	Record daily precipitation	57.0 mm (2.2 in)	46 of 100 (Notable)
Kwepertuin	South Africa	Record daily precipitation	36.5 mm (1.4 in)	45 of 100 (Notable)
Sarelsrivier	South Africa	Record daily precipitation	33.0 mm (1.3 in)	45 of 100 (Notable)
Bloemhof	South Africa	Record daily precipitation	71.0 mm (2.8 in)	45 of 100 (Notable)
Laborare	South Africa	Record daily precipitation	35.0 mm (1.4 in)	45 of 100 (Notable)
De Hoop	South Africa	Record daily precipitation	27.0 mm (1.1 in)	44 of 100 (Notable)
Umzimkulu (Tnk)	South Africa	Record daily precipitation	36.5 mm (1.4 in)	44 of 100 (Notable)
Truckee Rs	United States	Record daily snowfall	10.2 cm (4.0 in)	44 of 100 (Notable)
Antelope 6 SSW	United States	Record daily snowfall	15.2 cm (6.0 in)	44 of 100 (Notable)
Longvale	South Africa	Record daily precipitation	65.3 mm (2.6 in)	43 of 100 (Notable)
Die Hoogte	South Africa	Record daily precipitation	31.5 mm (1.2 in)	42 of 100 (Notable)
Fort Fordyce (Bos)	South Africa	Record daily precipitation	38.0 mm (1.5 in)	42 of 100 (Notable)
Graaff Reinet	South Africa	Record daily precipitation	88.5 mm (3.5 in)	42 of 100 (Notable)
Ebenezer (Weltevrede)	South Africa	Record daily precipitation	25.5 mm (1.0 in)	42 of 100 (Notable)
Fountain Head	South Africa	Record daily precipitation	25.5 mm (1.0 in)	41 of 100 (Notable)
Keokuk L&D 19	United States	Record daily precipitation	45.7 mm (1.8 in)	40 of 100 (Notable)
Angel Albino Corzo	Mexico	Record daily precipitation	98.3 mm (3.9 in)	39 of 100 (Notable)
Grootvlakte	South Africa	Record daily precipitation	44.0 mm (1.7 in)	39 of 100 (Notable)
Elandspoort	South Africa	Record daily precipitation	46.0 mm (1.8 in)	39 of 100 (Notable)
Galeana (Smn)	Mexico	Record high minimum temperature	25.0 C (77.0 F)	38 of 100 (Notable)
Paardekraal	South Africa	Record daily precipitation	52.0 mm (2.0 in)	38 of 100 (Notable)
Tarkastad (Pol)	South Africa	Record daily precipitation	45.2 mm (1.8 in)	38 of 100 (Notable)
Southport 5 N	United States	Record high maximum temperature	32.8 C (91.0 F)	38 of 100 (Notable)

Counts by Type and Timescale

662 records

Records set or tied on 7 May 1977 by type: Highest daily maximum 66, Lowest daily maximum 83, Highest daily minimum 111, Lowest daily minimum 55, Heaviest daily rainfall 321, Heaviest daily snowfall 23, Deepest snow cover 3.

Records on 7 May 1977 by type
Record type	Records
Highest daily maximum	66
Lowest daily maximum	83
Highest daily minimum	111
Lowest daily minimum	55
Heaviest daily rainfall	321
Heaviest daily snowfall	23
Deepest snow cover	3

Records on 7 May 1977 by timescale: all-time 7, monthly 25, daily 630.

How Much Records Were Beaten By

539 broken records

Margins by which the 539 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 137.0. Ties are not counted.

Top 20 by Significance

7 May 1977

Top 20 records on 7 May 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
7 May 1977	Grahamstown, ZA	daily rain	95.0 mm (3.7 in)	64.3 mm (2.5 in)	88 years	76 of 100 (Major)
7 May 1977	Humansdorp (Pol), ZA	daily rain	92.0 mm (3.6 in)	80.1 mm (3.2 in)	84 years	75 of 100 (Major)
7 May 1977	Roodebloem, ZA	all-time rain	123.0 mm (4.8 in)	41.0 mm (1.6 in)	16 years	73 of 100 (Major)
7 May 1977	Jansenville, ZA	all-time rain	104.0 mm (4.1 in)	18.4 mm (0.7 in)	55 years	70 of 100 (Major)
7 May 1977	Cullendale, ZA	daily rain	60.2 mm (2.4 in)	39.9 mm (1.6 in)	88 years	70 of 100 (Major)
7 May 1977	Fir Glen, ZA	daily rain	70.0 mm (2.8 in)	42.6 mm (1.7 in)	88 years	69 of 100 (Major)
7 May 1977	Uitkomst, ZA	all-time rain	136.5 mm (5.4 in)	52.5 mm (2.1 in)	16 years	69 of 100 (Major)
7 May 1977	Pearston (Pol), ZA	daily rain	68.0 mm (2.7 in)	46.2 mm (1.8 in)	68 years	69 of 100 (Major)
7 May 1977	Goudveld (Bos), ZA	daily rain	83.0 mm (3.3 in)	71.1 mm (2.8 in)	64 years	68 of 100 (Major)
7 May 1977	Aberdeen (Tnk), ZA	daily rain	54.0 mm (2.1 in)	32.2 mm (1.3 in)	59 years	66 of 100 (Major)
7 May 1977	Purdum, US	all-time rain	123.7 mm (4.9 in)	22.1 mm (0.9 in)	65 years	65 of 100 (Major)
7 May 1977	Somerset East, ZA	daily rain	76.0 mm (3.0 in)	39.9 mm (1.6 in)	56 years	64 of 100 (Major)
7 May 1977	Winterhoek, ZA	daily rain	67.0 mm (2.6 in)	59.4 mm (2.3 in)	52 years	63 of 100 (Major)
7 May 1977	Fort Beaufort, ZA	daily rain	33.5 mm (1.3 in)	22.6 mm (0.9 in)	86 years	62 of 100 (Major)
7 May 1977	Rocklands, ZA	daily rain	35.5 mm (1.4 in)	26.1 mm (1.0 in)	52 years	62 of 100 (Major)
7 May 1977	Adelaide (Pol), ZA	daily rain	47.0 mm (1.9 in)	35.8 mm (1.4 in)	39 years	59 of 100 (Notable)
7 May 1977	Humula (Rylands), AU	daily rain	40.0 mm (1.6 in)	21.7 mm (0.9 in)	74 years	58 of 100 (Notable)
7 May 1977	Albertvale, ZA	daily rain	38.5 mm (1.5 in)	28.6 mm (1.1 in)	68 years	57 of 100 (Notable)
7 May 1977	Houd Constant, ZA	monthly rain	125.0 mm (4.9 in)	73.0 mm (2.9 in)	9 years	57 of 100 (Notable)
7 May 1977	Tafelberg Hall, ZA	daily rain	30.5 mm (1.2 in)	17.8 mm (0.7 in)	86 years	57 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 662 records.

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

Records on 05-07 in each year
Year	Records
1795	2
1805	1
1816	1
1825	2
1837	1
1838	1
1844	1
1845	2
1846	1
1848	2
1850	2
1852	1
1853	1
1856	3
1857	1
1861	3
1862	1
1863	1
1864	1
1867	3
1869	1
1870	1
1872	1
1874	2
1876	3
1878	1
1879	2
1880	1
1884	2
1885	1
1886	4
1887	1
1888	1
1889	2
1890	4
1891	4
1892	2
1894	4
1895	2
1897	5
1898	7
1899	3
1900	10
1901	1
1902	6
1903	13
1904	19
1905	21
1906	15
1907	14
1908	29
1909	15
1910	16
1911	14
1912	14
1913	30
1914	37
1915	40
1916	34
1917	188
1918	60
1919	263
1920	59
1921	41
1922	40
1923	119
1924	141
1925	207
1926	227
1927	191
1928	204
1929	224
1930	637
1931	473
1932	288
1933	291
1934	698
1935	298
1936	466
1937	121
1938	467
1939	194
1940	317
1941	317
1942	270
1943	416
1944	476
1945	751
1946	339
1947	727
1948	338
1949	439
1950	526
1951	226
1952	485
1953	541
1954	481
1955	393
1956	665
1957	546
1958	585
1959	335
1960	899
1961	442
1962	381
1963	825
1964	687
1965	671
1966	762
1967	973
1968	756
1969	678
1970	822
1971	364
1972	515
1973	447
1974	743
1975	784
1976	782
1977	662
1978	925
1979	888
1980	593
1981	710
1982	802
1983	724
1984	1,300
1985	557
1986	1,163
1987	1,115
1988	752
1989	1,880
1990	1,024
1991	599
1992	1,830
1993	831
1994	621
1995	997
1996	880
1997	1,359
1998	1,166
1999	1,008
2000	1,693
2001	743
2002	1,344
2003	1,138
2004	1,397
2005	645
2006	833
2007	1,047
2008	526
2009	735
2010	1,123
2011	558
2012	709
2013	633
2014	646
2015	569
2016	677
2017	543
2018	542
2019	522
2020	577
2021	484
2022	784
2023	667
2024	858
2025	635
2026	715

Download the Data

Data for records on 1977-05-07: 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	467
20 to 40	44
40 to 60	16
60 to 80	7
80 to 100	2
100 to 120	1
120 to 140	2