Weather Records on 17 August 1970

467 weather records were set or tied worldwide on 17 August 1970. Highest significance: Mount Seymour (Overton), AU.

Key Facts for 17 August 1970

On 17 August 1970, 467 weather records were set or tied at long-record stations worldwide.
122 were record highs and 86 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 43 monthly and 422 daily.
Mount Seymour (Overton) set a monthly record daily precipitation of 58.4 mm (2.3 in) on 17 August 1970.
Across 162 earlier years (1797 to 2026) the same calendar date averaged 474 records.

Record Map

467 stations

467 station records on 17 August 1970 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 August 1970: highest significance records shown on the map
Station	Country	Type	Value	Significance
Mount Seymour (Overton)	Australia	Record daily precipitation	58.4 mm (2.3 in)	67 of 100 (Major)
Stonehenge	Australia	Record daily precipitation	71.4 mm (2.8 in)	66 of 100 (Major)
Colebrook (the Meadows)	Australia	Record daily precipitation	67.3 mm (2.6 in)	65 of 100 (Major)
Kempton (Oakmore)	Australia	Record daily precipitation	66.0 mm (2.6 in)	65 of 100 (Major)
Apsley (Parki)	Australia	Record daily precipitation	54.4 mm (2.1 in)	64 of 100 (Major)
Tunnack Post Office	Australia	Record daily precipitation	83.8 mm (3.3 in)	62 of 100 (Major)
Beech Forest	Australia	Record daily precipitation	58.9 mm (2.3 in)	58 of 100 (Notable)
Maria Island (Darlington)	Australia	Record daily precipitation	100.6 mm (4.0 in)	58 of 100 (Notable)
Jericho (Bowsden)	Australia	Record daily precipitation	66.0 mm (2.6 in)	58 of 100 (Notable)
Kamareddy	India	Record daily precipitation	211.0 mm (8.3 in)	57 of 100 (Notable)
Orford South	Australia	Record daily precipitation	69.9 mm (2.8 in)	56 of 100 (Notable)
Wattle Hill	Australia	Record daily precipitation	62.5 mm (2.5 in)	56 of 100 (Notable)
Nubeena	Australia	Record daily precipitation	61.0 mm (2.4 in)	56 of 100 (Notable)
York Plains (Handroyd)	Australia	Record daily precipitation	62.5 mm (2.5 in)	55 of 100 (Notable)
Tasman Island Lighthouse	Australia	Record daily precipitation	37.6 mm (1.5 in)	55 of 100 (Notable)
Woodbury (the Braes)	Australia	Record daily precipitation	58.4 mm (2.3 in)	54 of 100 (Notable)
Oatlands Post Office	Australia	Record daily precipitation	52.3 mm (2.1 in)	53 of 100 (Notable)
Kingston	Australia	Record daily precipitation	35.6 mm (1.4 in)	53 of 100 (Notable)
Triabunna (3 Boyle Street)	Australia	Record daily precipitation	66.0 mm (2.6 in)	52 of 100 (Notable)
Swansea Post Office	Australia	Record daily precipitation	51.3 mm (2.0 in)	51 of 100 (Notable)
Mangalore (Mangalore Farm)	Australia	Record daily precipitation	40.6 mm (1.6 in)	51 of 100 (Notable)
Opossum Bay	Australia	Record daily precipitation	33.0 mm (1.3 in)	51 of 100 (Notable)
Sorell (Whitlea)	Australia	Record daily precipitation	41.9 mm (1.6 in)	50 of 100 (Notable)
Bodalla Post Office	Australia	Record daily precipitation	39.6 mm (1.6 in)	49 of 100 (Notable)
Stonehouse	Australia	Record daily precipitation	63.5 mm (2.5 in)	49 of 100 (Notable)
Richmond (Lowlands)	Australia	Record daily precipitation	44.2 mm (1.7 in)	49 of 100 (Notable)
Hobart Botanical Gardens	Australia	Record daily precipitation	45.2 mm (1.8 in)	48 of 100 (Notable)
Richmond (Brookbank)	Australia	Record daily precipitation	39.4 mm (1.6 in)	48 of 100 (Notable)
Pacelma	Russia	Record daily precipitation	46.6 mm (1.8 in)	48 of 100 (Notable)
Kellevie	Australia	Record daily precipitation	62.7 mm (2.5 in)	47 of 100 (Notable)
Belthangady	India	Record daily precipitation	166.2 mm (6.5 in)	46 of 100 (Notable)
Bream Creek (Stroud)	Australia	Record daily precipitation	51.3 mm (2.0 in)	45 of 100 (Notable)
Mamanguape	Brazil	Record daily precipitation	72.5 mm (2.9 in)	44 of 100 (Notable)
Mount Gambier Post Office	Australia	Record daily precipitation	25.4 mm (1.0 in)	43 of 100 (Notable)
Gvarv	Norway	Record daily precipitation	50.6 mm (2.0 in)	43 of 100 (Notable)
Khed	India	Record daily precipitation	165.0 mm (6.5 in)	41 of 100 (Notable)
Waddamana Field Study Centre	Australia	Record daily precipitation	53.3 mm (2.1 in)	40 of 100 (Notable)
Barsi	India	Record daily precipitation	71.0 mm (2.8 in)	40 of 100 (Notable)
Runnymede (Whitemarsh)	Australia	Record daily precipitation	63.5 mm (2.5 in)	39 of 100 (Notable)
Gandipet(Osmansa)	India	Record daily precipitation	78.7 mm (3.1 in)	39 of 100 (Notable)
Rjukan	Norway	Record daily precipitation	57.0 mm (2.2 in)	39 of 100 (Notable)
Shamrock	United States	Record daily precipitation	55.4 mm (2.2 in)	39 of 100 (Notable)
Nowa Nowa (Wairewa)	Australia	Record daily precipitation	36.8 mm (1.4 in)	38 of 100 (Notable)
Swansea (Kelvedon)	Australia	Record daily precipitation	31.2 mm (1.2 in)	38 of 100 (Notable)
Rokeby (the Mall)	Australia	Record daily precipitation	31.8 mm (1.3 in)	37 of 100 (Notable)
Inverell Comparison	Australia	Record low maximum temperature	12.0 C (53.6 F)	36 of 100 (Notable)
West Wyalong (Tallimbalong)	Australia	Record daily precipitation	30.0 mm (1.2 in)	36 of 100 (Notable)
Oatlands (Bow Hill)	Australia	Record daily precipitation	61.0 mm (2.4 in)	36 of 100 (Notable)
Lifjell	Norway	Record daily precipitation	48.1 mm (1.9 in)	36 of 100 (Notable)
Baridpur	India	Record daily precipitation	157.5 mm (6.2 in)	34 of 100 (Routine)
Vishakhapatnam	India	Record daily precipitation	42.6 mm (1.7 in)	33 of 100 (Routine)
Hedrum	Norway	Record daily precipitation	48.0 mm (1.9 in)	33 of 100 (Routine)
Rauland	Norway	Record daily precipitation	34.5 mm (1.4 in)	33 of 100 (Routine)
Turinsk	Russia	Record daily precipitation	28.4 mm (1.1 in)	33 of 100 (Routine)
Sydney (Observatory Hill)	Australia	Record low maximum temperature	12.9 C (55.2 F)	32 of 100 (Routine)
Melton Mowbray (Mount Vernon)	Australia	Record daily precipitation	39.1 mm (1.5 in)	32 of 100 (Routine)
Jactial	India	Record daily precipitation	87.0 mm (3.4 in)	32 of 100 (Routine)
Mc Minnville	United States	Record low minimum temperature	1.1 C (34.0 F)	32 of 100 (Routine)
Laxmanchanda	India	Record daily precipitation	190.5 mm (7.5 in)	31 of 100 (Routine)
Atmakur	India	Record daily precipitation	64.3 mm (2.5 in)	31 of 100 (Routine)

Counts by Type and Timescale

467 records

Records set or tied on 17 August 1970 by type: Highest daily maximum 52, Lowest daily maximum 39, Highest daily minimum 70, Lowest daily minimum 47, Heaviest daily rainfall 259.

Records on 17 August 1970 by type
Record type	Records
Highest daily maximum	52
Lowest daily maximum	39
Highest daily minimum	70
Lowest daily minimum	47
Heaviest daily rainfall	259
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 17 August 1970 by timescale: all-time 2, monthly 43, daily 422.

How Much Records Were Beaten By

379 broken records

Margins by which the 379 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 106.0. Ties are not counted.

Top 20 by Significance

17 August 1970

Top 20 records on 17 August 1970 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 August 1970	Mount Seymour (Overton), AU	monthly rain	58.4 mm (2.3 in)	21.1 mm (0.8 in)	38 years	67 of 100 (Major)
17 August 1970	Stonehenge, AU	monthly rain	71.4 mm (2.8 in)	40.4 mm (1.6 in)	38 years	66 of 100 (Major)
17 August 1970	Colebrook (the Meadows), AU	monthly rain	67.3 mm (2.6 in)	34.3 mm (1.4 in)	31 years	65 of 100 (Major)
17 August 1970	Kempton (Oakmore), AU	monthly rain	66.0 mm (2.6 in)	33.0 mm (1.3 in)	28 years	65 of 100 (Major)
17 August 1970	Apsley (Parki), AU	monthly rain	54.4 mm (2.1 in)	24.7 mm (1.0 in)	31 years	64 of 100 (Major)
17 August 1970	Tunnack Post Office, AU	monthly rain	83.8 mm (3.3 in)	31.7 mm (1.2 in)	28 years	62 of 100 (Major)
17 August 1970	Beech Forest, AU	daily rain	58.9 mm (2.3 in)	33.5 mm (1.3 in)	61 years	58 of 100 (Notable)
17 August 1970	Maria Island (Darlington), AU	monthly rain	100.6 mm (4.0 in)	56.1 mm (2.2 in)	11 years	58 of 100 (Notable)
17 August 1970	Jericho (Bowsden), AU	monthly rain	66.0 mm (2.6 in)	36.0 mm (1.4 in)	19 years	58 of 100 (Notable)
17 August 1970	Kamareddy, IN	monthly rain	211.0 mm (8.3 in)	106.0 mm (4.2 in)	10 years	57 of 100 (Notable)
17 August 1970	Orford South, AU	monthly rain	69.9 mm (2.8 in)	25.4 mm (1.0 in)	11 years	56 of 100 (Notable)
17 August 1970	Wattle Hill, AU	monthly rain	62.5 mm (2.5 in)	23.6 mm (0.9 in)	12 years	56 of 100 (Notable)
17 August 1970	Nubeena, AU	monthly rain	61.0 mm (2.4 in)	22.9 mm (0.9 in)	5 years	56 of 100 (Notable)
17 August 1970	York Plains (Handroyd), AU	monthly rain	62.5 mm (2.5 in)	30.0 mm (1.2 in)	1 year	55 of 100 (Notable)
17 August 1970	Tasman Island Lighthouse, AU	daily rain	37.6 mm (1.5 in)	25.4 mm (1.0 in)	36 years	55 of 100 (Notable)
17 August 1970	Woodbury (the Braes), AU	monthly rain	58.4 mm (2.3 in)	26.4 mm (1.0 in)	2 years	54 of 100 (Notable)
17 August 1970	Oatlands Post Office, AU	monthly rain	52.3 mm (2.1 in)	10.6 mm (0.4 in)	31 years	53 of 100 (Notable)
17 August 1970	Kingston, AU	daily rain	35.6 mm (1.4 in)	24.9 mm (1.0 in)	24 years	53 of 100 (Notable)
17 August 1970	Triabunna (3 Boyle Street), AU	monthly rain	66.0 mm (2.6 in)	19.3 mm (0.8 in)	11 years	52 of 100 (Notable)
17 August 1970	Swansea Post Office, AU	daily rain	51.3 mm (2.0 in)	25.1 mm (1.0 in)	12 years	51 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

1797 to 1970

Records set or tied on this calendar date in each year from 1797 to 1970. 1970 had 467 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 1970-08-17: 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 20	335
20 to 40	38
40 to 60	4
60 to 80	1
80 to 100	0
100 to 120	1