Weather Records on 17 August 1977

1,216 weather records were set or tied worldwide on 17 August 1977. Highest significance: Newhall S Fc32Ce, US.

Key Facts for 17 August 1977

On 17 August 1977, 1,216 weather records were set or tied at long-record stations worldwide.
400 were record highs and 329 were record lows, counting maximum and minimum temperature.
By timescale, 12 were all-time records, 113 monthly and 1,091 daily.
Newhall S Fc32Ce set a monthly record daily precipitation of 57.9 mm (2.3 in) on 17 August 1977.
Across 162 earlier years (1797 to 2026) the same calendar date averaged 469 records.

Record Map

1,216 stations

1,216 station records on 17 August 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 August 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Newhall S Fc32Ce	United States	Record daily precipitation	57.9 mm (2.3 in)	77 of 100 (Major)
San Bernardino F S 226	United States	Record daily precipitation	54.4 mm (2.1 in)	76 of 100 (Major)
Morgantown Muni AP	United States	Record daily precipitation	66.0 mm (2.6 in)	75 of 100 (Major)
Krasnaja Poljana	Russia	Record daily precipitation	187.9 mm (7.4 in)	70 of 100 (Major)
Redlands	United States	Record daily precipitation	49.0 mm (1.9 in)	70 of 100 (Major)
Avalon Pleasure Pier	United States	Record daily precipitation	58.9 mm (2.3 in)	69 of 100 (Major)
Corona	United States	Record daily precipitation	42.4 mm (1.7 in)	69 of 100 (Major)
San Gabriel Canyon Ph	United States	Record daily precipitation	62.2 mm (2.4 in)	69 of 100 (Major)
Glendora Fc 287B	United States	Record daily precipitation	64.0 mm (2.5 in)	68 of 100 (Major)
Pasadena	United States	Record daily precipitation	54.9 mm (2.2 in)	68 of 100 (Major)
Altadena	United States	Record daily precipitation	57.7 mm (2.3 in)	65 of 100 (Major)
Lytle Creek Rs	United States	Record daily precipitation	59.9 mm (2.4 in)	65 of 100 (Major)
Palmdale	United States	Record daily precipitation	29.2 mm (1.1 in)	65 of 100 (Major)
Orono	United States	Record daily precipitation	52.6 mm (2.1 in)	64 of 100 (Major)
Burbank Valley Pump Plt	United States	Record daily precipitation	72.6 mm (2.9 in)	63 of 100 (Major)
Chula Vista	United States	Record daily precipitation	49.0 mm (1.9 in)	63 of 100 (Major)
Snow Creek Upper	United States	Record daily precipitation	86.4 mm (3.4 in)	62 of 100 (Major)
El Toro MCAS	United States	Record daily precipitation	65.5 mm (2.6 in)	62 of 100 (Major)
Los Angeles Downtown/Usc	United States	Record daily precipitation	52.3 mm (2.1 in)	62 of 100 (Major)
Newport Beach Harbor	United States	Record daily precipitation	42.4 mm (1.7 in)	60 of 100 (Major)
Santa Monica Pier	United States	Record daily precipitation	71.4 mm (2.8 in)	58 of 100 (Notable)
Machias	United States	Record daily precipitation	82.8 mm (3.3 in)	58 of 100 (Notable)
Torrance AP	United States	Record daily precipitation	71.1 mm (2.8 in)	58 of 100 (Notable)
San Jacinto	United States	Record daily precipitation	33.8 mm (1.3 in)	57 of 100 (Notable)
Downey Fire Dept. Fc107C	United States	Record daily precipitation	55.4 mm (2.2 in)	56 of 100 (Notable)
La Crescenta Fc251 C	United States	Record daily precipitation	53.3 mm (2.1 in)	56 of 100 (Notable)
Laguna Beach	United States	Record daily precipitation	44.5 mm (1.8 in)	56 of 100 (Notable)
U C L A	United States	Record daily precipitation	78.0 mm (3.1 in)	56 of 100 (Notable)
Standish 4NE	United States	Record daily precipitation	54.4 mm (2.1 in)	56 of 100 (Notable)
Samtredia	Georgia	Record daily precipitation	164.2 mm (6.5 in)	55 of 100 (Notable)
Covina City Yard Fc387B	United States	Record daily precipitation	67.6 mm (2.7 in)	55 of 100 (Notable)
Eastport	United States	Record daily precipitation	86.9 mm (3.4 in)	55 of 100 (Notable)
Goldfield	United States	Record daily precipitation	36.3 mm (1.4 in)	55 of 100 (Notable)
Barrett Dam	United States	Record daily precipitation	56.9 mm (2.2 in)	54 of 100 (Notable)
Poway Valley	United States	Record daily precipitation	28.4 mm (1.1 in)	54 of 100 (Notable)
Berlin	United States	Record daily precipitation	60.7 mm (2.4 in)	54 of 100 (Notable)
Dannemora	United States	Record daily precipitation	59.7 mm (2.4 in)	54 of 100 (Notable)
La Rumorosa	Mexico	Record daily precipitation	95.0 mm (3.7 in)	53 of 100 (Notable)
Los Angeles Intl AP	United States	Record daily precipitation	53.3 mm (2.1 in)	53 of 100 (Notable)
Barstow	United States	Record daily precipitation	36.8 mm (1.4 in)	52 of 100 (Notable)
Adaven	United States	Record daily precipitation	66.3 mm (2.6 in)	52 of 100 (Notable)
Kalacinsk	Russia	Record daily precipitation	71.9 mm (2.8 in)	51 of 100 (Notable)
Indio Fire STN	United States	Record daily precipitation	80.3 mm (3.2 in)	51 of 100 (Notable)
Oceanside Marina	United States	Record daily precipitation	55.9 mm (2.2 in)	51 of 100 (Notable)
Yorba Linda	United States	Record daily precipitation	61.2 mm (2.4 in)	51 of 100 (Notable)
Isilkul	Russia	Record daily precipitation	39.9 mm (1.6 in)	50 of 100 (Notable)
Culver City	United States	Record daily precipitation	43.2 mm (1.7 in)	50 of 100 (Notable)
Cuyamaca	United States	Record daily precipitation	66.3 mm (2.6 in)	50 of 100 (Notable)
Van Buren 1 NE	United States	Record daily precipitation	74.9 mm (2.9 in)	50 of 100 (Notable)
Errol	United States	Record daily precipitation	66.5 mm (2.6 in)	50 of 100 (Notable)
Alliston	Canada	Record daily precipitation	68.8 mm (2.7 in)	49 of 100 (Notable)
Sandberg	United States	Record daily precipitation	42.4 mm (1.7 in)	49 of 100 (Notable)
Orleans-Montante (Pcd)	Brazil	Record daily precipitation	124.2 mm (4.9 in)	48 of 100 (Notable)
Centerville 5 NE	United States	Record daily precipitation	41.1 mm (1.6 in)	48 of 100 (Notable)
Lancaster	United States	Record daily precipitation	82.8 mm (3.3 in)	48 of 100 (Notable)
Wanakena Rngr School	United States	Record daily precipitation	52.1 mm (2.1 in)	48 of 100 (Notable)
Saint Johnsbury	United States	Record daily precipitation	77.7 mm (3.1 in)	48 of 100 (Notable)
Santa Ana Fire STN	United States	Record daily precipitation	45.5 mm (1.8 in)	47 of 100 (Notable)
Walnut Ni Fc102C	United States	Record daily precipitation	30.5 mm (1.2 in)	47 of 100 (Notable)
York Pond	United States	Record daily precipitation	71.6 mm (2.8 in)	47 of 100 (Notable)

Counts by Type and Timescale

1,216 records

Records set or tied on 17 August 1977 by type: Highest daily maximum 170, Lowest daily maximum 227, Highest daily minimum 230, Lowest daily minimum 102, Heaviest daily rainfall 487.

Records on 17 August 1977 by type
Record type	Records
Highest daily maximum	170
Lowest daily maximum	227
Highest daily minimum	230
Lowest daily minimum	102
Heaviest daily rainfall	487
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 17 August 1977 by timescale: all-time 12, monthly 113, daily 1,091.

How Much Records Were Beaten By

981 broken records

Margins by which the 981 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 69.4. Ties are not counted.

Top 20 by Significance

17 August 1977

Top 20 records on 17 August 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 August 1977	Newhall S Fc32Ce, US	monthly rain	57.9 mm (2.3 in)	46.5 mm (1.8 in)	67 years	77 of 100 (Major)
17 August 1977	San Bernardino F S 226, US	monthly rain	54.4 mm (2.1 in)	23.7 mm (0.9 in)	67 years	76 of 100 (Major)
17 August 1977	Morgantown Muni AP, US	daily rain	66.0 mm (2.6 in)	44.2 mm (1.7 in)	100 years	75 of 100 (Major)
17 August 1977	Krasnaja Poljana, RU	all-time rain	187.9 mm (7.4 in)	61.7 mm (2.4 in)	21 years	70 of 100 (Major)
17 August 1977	Redlands, US	monthly rain	49.0 mm (1.9 in)	24.6 mm (1.0 in)	41 years	70 of 100 (Major)
17 August 1977	Avalon Pleasure Pier, US	monthly rain	58.9 mm (2.3 in)	43.2 mm (1.7 in)	44 years	69 of 100 (Major)
17 August 1977	Corona, US	monthly rain	42.4 mm (1.7 in)	29.2 mm (1.1 in)	41 years	69 of 100 (Major)
17 August 1977	San Gabriel Canyon Ph, US	monthly rain	62.2 mm (2.4 in)	43.1 mm (1.7 in)	43 years	69 of 100 (Major)
17 August 1977	Glendora Fc 287B, US	monthly rain	64.0 mm (2.5 in)	53.3 mm (2.1 in)	35 years	68 of 100 (Major)
17 August 1977	Pasadena, US	monthly rain	54.9 mm (2.2 in)	41.9 mm (1.6 in)	35 years	68 of 100 (Major)
17 August 1977	Altadena, US	monthly rain	57.7 mm (2.3 in)	43.2 mm (1.7 in)	35 years	65 of 100 (Major)
17 August 1977	Lytle Creek Rs, US	monthly rain	59.9 mm (2.4 in)	41.4 mm (1.6 in)	35 years	65 of 100 (Major)
17 August 1977	Palmdale, US	daily rain	29.2 mm (1.1 in)	29.2 mm (1.1 in)	74 years	65 of 100 (Major)
17 August 1977	Orono, US	daily rain	52.6 mm (2.1 in)	36.1 mm (1.4 in)	72 years	64 of 100 (Major)
17 August 1977	Burbank Valley Pump Plt, US	monthly rain	72.6 mm (2.9 in)	56.6 mm (2.2 in)	35 years	63 of 100 (Major)
17 August 1977	Chula Vista, US	monthly rain	49.0 mm (1.9 in)	30.7 mm (1.2 in)	25 years	63 of 100 (Major)
17 August 1977	Snow Creek Upper, US	monthly rain	86.4 mm (3.4 in)	47.5 mm (1.9 in)	31 years	62 of 100 (Major)
17 August 1977	El Toro MCAS, US	monthly rain	65.5 mm (2.6 in)	49.0 mm (1.9 in)	31 years	62 of 100 (Major)
17 August 1977	Los Angeles Downtown/Usc, US	monthly rain	52.3 mm (2.1 in)	42.6 mm (1.7 in)	19 years	62 of 100 (Major)
17 August 1977	Newport Beach Harbor, US	monthly rain	42.4 mm (1.7 in)	33.8 mm (1.3 in)	41 years	60 of 100 (Major)

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

1797 to 1977

Records set or tied on this calendar date in each year from 1797 to 1977. 1977 had 1,216 records.

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

Records on 08-17 in each year
Year	Records
1797	2
1802	2
1820	2
1837	1
1838	2
1841	2
1842	1
1845	2
1853	1
1854	1
1856	1
1857	1
1861	3
1862	1
1867	1
1868	3
1869	1
1872	1
1875	2
1876	5
1879	1
1881	1
1882	1
1883	2
1885	3
1886	1
1888	5
1891	1
1892	3
1893	2
1894	3
1895	2
1896	3
1897	1
1898	5
1899	8
1900	3
1901	14
1902	7
1903	6
1904	2
1905	11
1906	28
1907	9
1908	26
1909	24
1910	17
1911	18
1912	31
1913	79
1914	41
1915	28
1916	33
1917	35
1918	112
1919	37
1920	110
1921	37
1922	169
1923	161
1924	171
1925	130
1926	182
1927	228
1928	131
1929	243
1930	138
1931	302
1932	360
1933	260
1934	377
1935	437
1936	670
1937	726
1938	466
1939	364
1940	341
1941	378
1942	461
1943	743
1944	531
1945	387
1946	433
1947	682
1948	475
1949	371
1950	522
1951	413
1952	470
1953	345
1954	685
1955	465
1956	407
1957	504
1958	519
1959	543
1960	533
1961	998
1962	445
1963	650
1964	410
1965	641
1966	496
1967	679
1968	953
1969	593
1970	467
1971	447
1972	1,044
1973	750
1974	582
1975	612
1976	797
1977	1,216
1978	814
1979	1,464
1980	895
1981	1,112
1982	554
1983	1,574
1984	726
1985	948
1986	916
1987	1,150
1988	1,608
1989	687
1990	949
1991	560
1992	1,813
1993	803
1994	1,038
1995	1,724
1996	752
1997	1,544
1998	1,003
1999	697
2000	994
2001	1,101
2002	1,266
2003	948
2004	1,046
2005	722
2006	814
2007	1,646
2008	1,301
2009	922
2010	1,105
2011	956
2012	1,215
2013	802
2014	997
2015	890
2016	748
2017	544
2018	518
2019	467
2020	1,529
2021	800
2022	1,428
2023	1,032
2024	740
2025	538
2026	535

Download the Data

Data for records on 1977-08-17: 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 10	743
10 to 20	111
20 to 30	67
30 to 40	26
40 to 50	22
50 to 60	8
60 to 70	4