Weather Records on 30 July 1977

641 weather records were set or tied worldwide on 30 July 1977. Highest significance: Aleksandrovsk-Sahalinskij, RU.

Key Facts for 30 July 1977

On 30 July 1977, 641 weather records were set or tied at long-record stations worldwide.
203 were record highs and 194 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 16 monthly and 625 daily.
Aleksandrovsk-Sahalinskij set a daily record precipitation of 61.2 mm (2.4 in) on 30 July 1977.
Across 168 earlier years (1794 to 2026) the same calendar date averaged 439 records.

Record Map

641 stations

641 station records on 30 July 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 30 July 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Aleksandrovsk-Sahalinskij	Russia	Record daily precipitation	61.2 mm (2.4 in)	74 of 100 (Major)
W Pt	United States	Record daily precipitation	114.3 mm (4.5 in)	63 of 100 (Major)
Miamisburg	United States	Record daily precipitation	73.7 mm (2.9 in)	55 of 100 (Notable)
Blagodarnyj	Russia	Record daily precipitation	48.0 mm (1.9 in)	53 of 100 (Notable)
Port Hastings	Canada	Record daily precipitation	38.1 mm (1.5 in)	51 of 100 (Notable)
Lyon - St Exupery	France	Record daily precipitation	50.0 mm (2.0 in)	51 of 100 (Notable)
Jardim	Brazil	Record daily precipitation	33.4 mm (1.3 in)	50 of 100 (Notable)
Freiburg Im Breisgau-Herdern	Germany	Record daily precipitation	44.2 mm (1.7 in)	50 of 100 (Notable)
Col du Grand St-Bernard	Switzerland	Record daily precipitation	47.1 mm (1.9 in)	48 of 100 (Notable)
Freiburg	Germany	Record daily precipitation	35.2 mm (1.4 in)	46 of 100 (Notable)
Berkeley	United States	Record high minimum temperature	18.3 C (64.9 F)	46 of 100 (Notable)
Salmon Hole	Canada	Record daily precipitation	83.8 mm (3.3 in)	45 of 100 (Notable)
San Mateo	United States	Record high maximum temperature	37.8 C (100.0 F)	45 of 100 (Notable)
Acude Gargalheiras	Brazil	Record daily precipitation	26.6 mm (1.0 in)	44 of 100 (Notable)
Trafalgar	Canada	Record daily precipitation	58.2 mm (2.3 in)	44 of 100 (Notable)
Villingen-Schwenningen	Germany	Record daily precipitation	47.6 mm (1.9 in)	44 of 100 (Notable)
Little Hickman Lock 8	United States	Record daily precipitation	67.1 mm (2.6 in)	44 of 100 (Notable)
San Francisco Intl AP	United States	Record high maximum temperature	36.1 C (97.0 F)	44 of 100 (Notable)
Embrun	France	Record daily precipitation	34.3 mm (1.4 in)	43 of 100 (Notable)
Covington	United States	Record daily precipitation	81.5 mm (3.2 in)	43 of 100 (Notable)
Middlesboro Fire Dept	United States	Record low maximum temperature	21.7 C (71.1 F)	43 of 100 (Notable)
Fredonia	United States	Record daily precipitation	43.4 mm (1.7 in)	43 of 100 (Notable)
Clemson UNIV	United States	Record low maximum temperature	21.7 C (71.1 F)	42 of 100 (Notable)
Sacramento 5 ESE	United States	Record high maximum temperature	42.8 C (109.0 F)	42 of 100 (Notable)
Sao Jose de Mipibu	Brazil	Record daily precipitation	75.8 mm (3.0 in)	41 of 100 (Notable)
Catingueira (Juca)	Brazil	Record daily precipitation	40.0 mm (1.6 in)	41 of 100 (Notable)
Bakuriani	Georgia	Record daily precipitation	34.8 mm (1.4 in)	41 of 100 (Notable)
Bradford Cntrl Fs	United States	Record daily precipitation	51.6 mm (2.0 in)	41 of 100 (Notable)
Alliston	Canada	Record daily precipitation	50.8 mm (2.0 in)	40 of 100 (Notable)
Albacete Los Llanos	Spain	Record low minimum temperature	8.8 C (47.8 F)	40 of 100 (Notable)
Berkeley	United States	Record high maximum temperature	31.7 C (89.1 F)	40 of 100 (Notable)
Hissar	India	Record daily precipitation	59.9 mm (2.4 in)	39 of 100 (Notable)
Milan	Italy	Record daily precipitation	54.8 mm (2.2 in)	39 of 100 (Notable)
Navacerrada	Spain	Record low maximum temperature	5.4 C (41.7 F)	39 of 100 (Notable)
Hinckley	United States	Record daily precipitation	42.7 mm (1.7 in)	39 of 100 (Notable)
Ingenio Tamazula	Mexico	Record low minimum temperature	11.7 C (53.1 F)	38 of 100 (Notable)
Ft Ross	United States	Record high maximum temperature	26.7 C (80.1 F)	38 of 100 (Notable)
Nome AP	United States	Record high maximum temperature	28.9 C (84.0 F)	38 of 100 (Notable)
Tranebjerg	Denmark	Record low minimum temperature	8.0 C (46.4 F)	37 of 100 (Notable)
Ft Bragg 5 N	United States	Record high maximum temperature	22.8 C (73.0 F)	37 of 100 (Notable)
Moffett Fed Airfield	United States	Record high maximum temperature	36.1 C (97.0 F)	37 of 100 (Notable)
Charlottetown Cda	Canada	Record daily precipitation	57.0 mm (2.2 in)	36 of 100 (Notable)
Nicosia	Cyprus	Record high minimum temperature	27.2 C (81.0 F)	36 of 100 (Notable)
Franklin	United States	Record daily precipitation	41.4 mm (1.6 in)	36 of 100 (Notable)
Petaluma AP	United States	Record high maximum temperature	40.0 C (104.0 F)	35 of 100 (Notable)
Schallstadt-Mengen	Germany	Record daily precipitation	26.4 mm (1.0 in)	34 of 100 (Routine)
Buynaksk	Russia	Record daily precipitation	41.7 mm (1.6 in)	34 of 100 (Routine)
Batavia	United States	Record daily precipitation	34.3 mm (1.4 in)	34 of 100 (Routine)
Olean	United States	Record daily precipitation	43.7 mm (1.7 in)	34 of 100 (Routine)
Sodus 1W	United States	Record daily precipitation	27.9 mm (1.1 in)	34 of 100 (Routine)
San Jose	United States	Record high maximum temperature	37.8 C (100.0 F)	33 of 100 (Routine)
San Rafael-Civic Ctr	United States	Record high minimum temperature	17.8 C (64.0 F)	33 of 100 (Routine)
Clinton 1SSW	United States	Record daily precipitation	27.9 mm (1.1 in)	33 of 100 (Routine)
Alameda NAS	United States	Record high maximum temperature	31.7 C (89.1 F)	33 of 100 (Routine)
San Francisco Dwtn	United States	Record high minimum temperature	16.1 C (61.0 F)	33 of 100 (Routine)
Chaplin	Canada	Record low maximum temperature	16.1 C (61.0 F)	32 of 100 (Routine)
Collegeville	Canada	Record daily precipitation	32.3 mm (1.3 in)	32 of 100 (Routine)
Shearwater A	Canada	Record daily precipitation	50.0 mm (2.0 in)	32 of 100 (Routine)
Chapulco	Mexico	Record high minimum temperature	17.8 C (64.0 F)	32 of 100 (Routine)
Daroca	Spain	Record low maximum temperature	16.8 C (62.2 F)	32 of 100 (Routine)

Counts by Type and Timescale

641 records

Records set or tied on 30 July 1977 by type: Highest daily maximum 107, Lowest daily maximum 123, Highest daily minimum 96, Lowest daily minimum 71, Heaviest daily rainfall 244.

Records on 30 July 1977 by type
Record type	Records
Highest daily maximum	107
Lowest daily maximum	123
Highest daily minimum	96
Lowest daily minimum	71
Heaviest daily rainfall	244
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 30 July 1977 by timescale: all-time 0, monthly 16, daily 625.

How Much Records Were Beaten By

521 broken records

Margins by which the 521 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 82.0. Ties are not counted.

Top 20 by Significance

30 July 1977

Top 20 records on 30 July 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 July 1977	Aleksandrovsk-Sahalinskij, RU	daily rain	61.2 mm (2.4 in)	36.0 mm (1.4 in)	83 years	74 of 100 (Major)
30 July 1977	W Pt, US	daily rain	114.3 mm (4.5 in)	82.0 mm (3.2 in)	51 years	63 of 100 (Major)
30 July 1977	Miamisburg, US	daily rain	73.7 mm (2.9 in)	41.4 mm (1.6 in)	50 years	55 of 100 (Notable)
30 July 1977	Blagodarnyj, RU	daily rain	48.0 mm (1.9 in)	38.2 mm (1.5 in)	31 years	53 of 100 (Notable)
30 July 1977	Port Hastings, CA	daily rain	38.1 mm (1.5 in)	12.7 mm (0.5 in)	99 years	51 of 100 (Notable)
30 July 1977	Lyon - St Exupery, FR	daily rain	50.0 mm (2.0 in)	34.1 mm (1.3 in)	24 years	51 of 100 (Notable)
30 July 1977	Jardim, BR	daily rain	33.4 mm (1.3 in)	30.3 mm (1.2 in)	56 years	50 of 100 (Notable)
30 July 1977	Freiburg Im Breisgau-Herdern, DE	daily rain	44.2 mm (1.7 in)	31.4 mm (1.2 in)	36 years	50 of 100 (Notable)
30 July 1977	Col du Grand St-Bernard, CH	daily rain	47.1 mm (1.9 in)	22.7 mm (0.9 in)	64 years	48 of 100 (Notable)
30 July 1977	Freiburg, DE	daily rain	35.2 mm (1.4 in)	10.6 mm (0.4 in)	82 years	46 of 100 (Notable)
30 July 1977	Berkeley, US	daily high min	18.3 C (64.9 F)	2.7 C (4.9 F)	59 years	46 of 100 (Notable)
30 July 1977	Salmon Hole, CA	monthly rain	83.8 mm (3.3 in)	21.8 mm (0.9 in)	34 years	45 of 100 (Notable)
30 July 1977	San Mateo, US	daily high max	37.8 C (100.0 F)	9.5 C (17.1 F)	40 years	45 of 100 (Notable)
30 July 1977	Acude Gargalheiras, BR	daily rain	26.6 mm (1.0 in)	26.6 mm (1.0 in)	55 years	44 of 100 (Notable)
30 July 1977	Trafalgar, CA	daily rain	58.2 mm (2.3 in)	37.9 mm (1.5 in)	20 years	44 of 100 (Notable)
30 July 1977	Villingen-Schwenningen, DE	daily rain	47.6 mm (1.9 in)	36.9 mm (1.5 in)	4 years	44 of 100 (Notable)
30 July 1977	Little Hickman Lock 8, US	daily rain	67.1 mm (2.6 in)	36.6 mm (1.4 in)	43 years	44 of 100 (Notable)
30 July 1977	San Francisco Intl AP, US	daily high max	36.1 C (97.0 F)	11.1 C (20.0 F)	27 years	44 of 100 (Notable)
30 July 1977	Embrun, FR	daily rain	34.3 mm (1.4 in)	17.9 mm (0.7 in)	47 years	43 of 100 (Notable)
30 July 1977	Covington, US	daily rain	81.5 mm (3.2 in)	37.0 mm (1.5 in)	27 years	43 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

1794 to 1977

Records set or tied on this calendar date in each year from 1794 to 1977. 1977 had 641 records.

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

Records on 07-30 in each year
Year	Records
1794	2
1797	1
1827	1
1828	2
1829	1
1830	1
1834	1
1837	2
1838	1
1840	1
1841	1
1843	1
1854	1
1857	1
1858	2
1860	4
1863	1
1867	1
1868	1
1869	2
1870	1
1874	2
1875	1
1876	1
1877	2
1879	1
1880	2
1885	3
1886	5
1887	6
1888	5
1889	1
1890	2
1891	1
1892	1
1893	10
1894	6
1895	2
1896	2
1897	4
1898	8
1899	2
1900	4
1901	11
1902	6
1903	25
1904	17
1905	29
1906	22
1907	11
1908	23
1909	30
1910	8
1911	54
1912	21
1913	34
1914	52
1915	26
1916	150
1917	93
1918	42
1919	19
1920	188
1921	193
1922	40
1923	428
1924	80
1925	275
1926	186
1927	109
1928	210
1929	221
1930	170
1931	432
1932	275
1933	451
1934	619
1935	340
1936	452
1937	245
1938	388
1939	395
1940	562
1941	371
1942	304
1943	397
1944	289
1945	299
1946	409
1947	394
1948	489
1949	512
1950	552
1951	322
1952	581
1953	345
1954	504
1955	787
1956	506
1957	289
1958	344
1959	391
1960	793
1961	511
1962	378
1963	308
1964	483
1965	978
1966	527
1967	282
1968	530
1969	506
1970	431
1971	2,319
1972	758
1973	434
1974	569
1975	1,048
1976	590
1977	641
1978	646
1979	761
1980	962
1981	851
1982	821
1983	904
1984	997
1985	1,029
1986	952
1987	1,084
1988	826
1989	1,227
1990	795
1991	734
1992	1,003
1993	965
1994	1,631
1995	1,207
1996	1,317
1997	933
1998	1,240
1999	1,456
2000	1,030
2001	1,400
2002	1,346
2003	1,163
2004	936
2005	788
2006	1,103
2007	1,160
2008	763
2009	1,328
2010	1,331
2011	1,003
2012	731
2013	737
2014	1,199
2015	682
2016	460
2017	464
2018	1,038
2019	486
2020	763
2021	839
2022	845
2023	683
2024	705
2025	869
2026	1,001

Download the Data

Data for records on 1977-07-30: 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	487
20 to 40	32
40 to 60	1
60 to 80	0
80 to 100	1