Weather Records on 17 August 1974

582 weather records were set or tied worldwide on 17 August 1974. Highest significance: Noupoort, ZA.

Key Facts for 17 August 1974

On 17 August 1974, 582 weather records were set or tied at long-record stations worldwide.
151 were record highs and 69 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 35 monthly and 547 daily.
Noupoort set a daily record precipitation of 56.0 mm (2.2 in) on 17 August 1974.
Across 162 earlier years (1797 to 2026) the same calendar date averaged 473 records.

Record Map

582 stations

582 station records on 17 August 1974 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 August 1974: highest significance records shown on the map
Station	Country	Type	Value	Significance
Noupoort	South Africa	Record daily precipitation	56.0 mm (2.2 in)	69 of 100 (Major)
Paulista	Brazil	Record daily precipitation	65.2 mm (2.6 in)	63 of 100 (Major)
Yardley Chase	South Africa	Record daily precipitation	35.5 mm (1.4 in)	63 of 100 (Major)
Hughenden	South Africa	Record daily precipitation	34.0 mm (1.3 in)	61 of 100 (Major)
Khosis	South Africa	Record daily precipitation	30.0 mm (1.2 in)	61 of 100 (Major)
Griquatown (Tnk)	South Africa	Record daily precipitation	37.5 mm (1.5 in)	59 of 100 (Notable)
Springvalley	South Africa	Record daily precipitation	39.0 mm (1.5 in)	57 of 100 (Notable)
Waverley	South Africa	Record daily precipitation	38.5 mm (1.5 in)	57 of 100 (Notable)
Modderrivier (Pol)	South Africa	Record daily precipitation	25.0 mm (1.0 in)	57 of 100 (Notable)
Olifantshoek (Pol)	South Africa	Record daily precipitation	34.0 mm (1.3 in)	57 of 100 (Notable)
Tussenvier	South Africa	Record daily precipitation	29.6 mm (1.2 in)	56 of 100 (Notable)
De Rust	South Africa	Record daily precipitation	53.5 mm (2.1 in)	55 of 100 (Notable)
Silverstreams	South Africa	Record daily precipitation	36.0 mm (1.4 in)	55 of 100 (Notable)
Buffelsfontein 14	South Africa	Record daily precipitation	45.5 mm (1.8 in)	54 of 100 (Notable)
Philipstown (Tnk)	South Africa	Record daily precipitation	50.0 mm (2.0 in)	54 of 100 (Notable)
Wimbledon	South Africa	Record daily precipitation	30.0 mm (1.2 in)	54 of 100 (Notable)
Smythe	South Africa	Record daily precipitation	39.0 mm (1.5 in)	54 of 100 (Notable)
Cleveland	United States	Record daily precipitation	83.1 mm (3.3 in)	54 of 100 (Notable)
Clarks Siding	South Africa	Record daily precipitation	41.5 mm (1.6 in)	53 of 100 (Notable)
Rooiwal	South Africa	Record daily precipitation	42.0 mm (1.7 in)	53 of 100 (Notable)
Rainier Paradise Rs	United States	Record snow depth	58.4 cm (23.0 in)	52 of 100 (Notable)
Bleskop	South Africa	Record daily precipitation	31.5 mm (1.2 in)	51 of 100 (Notable)
Newark Liberty Intl AP	United States	Record daily precipitation	87.4 mm (3.4 in)	51 of 100 (Notable)
Ny City Cntrl Park	United States	Record daily precipitation	72.6 mm (2.9 in)	51 of 100 (Notable)
Tylden "Tulden"	South Africa	Record daily precipitation	27.0 mm (1.1 in)	50 of 100 (Notable)
Lady Frere (Tnk)	South Africa	Record daily precipitation	28.0 mm (1.1 in)	50 of 100 (Notable)
Tuoy-Khaya	Russia	Record daily precipitation	33.2 mm (1.3 in)	49 of 100 (Notable)
Tweefontein	South Africa	Record daily precipitation	32.0 mm (1.3 in)	49 of 100 (Notable)
Grootdam	South Africa	Record daily precipitation	37.5 mm (1.5 in)	48 of 100 (Notable)
Queenstown	South Africa	Record daily precipitation	31.5 mm (1.2 in)	48 of 100 (Notable)
Grapevale	South Africa	Record daily precipitation	59.0 mm (2.3 in)	48 of 100 (Notable)
Marshmoor	South Africa	Record daily precipitation	52.5 mm (2.1 in)	48 of 100 (Notable)
Jamestown	South Africa	Record daily precipitation	50.0 mm (2.0 in)	48 of 100 (Notable)
Venterstad	South Africa	Record daily precipitation	65.0 mm (2.6 in)	48 of 100 (Notable)
Kendrew Estates	South Africa	Record daily precipitation	36.0 mm (1.4 in)	47 of 100 (Notable)
Goedehoop	South Africa	Record daily precipitation	60.5 mm (2.4 in)	47 of 100 (Notable)
Schmidtsdrif	South Africa	Record daily precipitation	29.5 mm (1.2 in)	47 of 100 (Notable)
Keilands	South Africa	Record daily precipitation	33.5 mm (1.3 in)	46 of 100 (Notable)
Dordrecht - Tnk 14	South Africa	Record daily precipitation	39.0 mm (1.5 in)	46 of 100 (Notable)
Plooysburg S.A.P.	South Africa	Record daily precipitation	25.5 mm (1.0 in)	46 of 100 (Notable)
Danielskuil	South Africa	Record daily precipitation	40.0 mm (1.6 in)	46 of 100 (Notable)
Winton	South Africa	Record daily precipitation	27.0 mm (1.1 in)	45 of 100 (Notable)
Kei Road (Pol)	South Africa	Record daily precipitation	33.0 mm (1.3 in)	44 of 100 (Notable)
Elandsfontein	South Africa	Record daily precipitation	50.0 mm (2.0 in)	44 of 100 (Notable)
Skilderkrans	South Africa	Record daily precipitation	40.0 mm (1.6 in)	44 of 100 (Notable)
Colesberg (Tnk)	South Africa	Record daily precipitation	44.5 mm (1.8 in)	44 of 100 (Notable)
Philippolis (Pol)	South Africa	Record daily precipitation	45.0 mm (1.8 in)	44 of 100 (Notable)
Newport	United States	Record daily precipitation	50.8 mm (2.0 in)	44 of 100 (Notable)
Umzonia (Rsv)	South Africa	Record daily precipitation	53.6 mm (2.1 in)	43 of 100 (Notable)
Thomas River (Sar)	South Africa	Record daily precipitation	30.5 mm (1.2 in)	43 of 100 (Notable)
Welgelegen(Middlemnt	South Africa	Record daily precipitation	48.0 mm (1.9 in)	43 of 100 (Notable)
Esperanza	South Africa	Record daily precipitation	48.7 mm (1.9 in)	43 of 100 (Notable)
Cathcart	South Africa	Record daily precipitation	25.5 mm (1.0 in)	42 of 100 (Notable)
Wildeperdehoek	South Africa	Record daily precipitation	46.5 mm (1.8 in)	42 of 100 (Notable)
Grootfontein 11,	South Africa	Record daily precipitation	26.6 mm (1.0 in)	42 of 100 (Notable)
Scott	United States	Record daily precipitation	76.5 mm (3.0 in)	42 of 100 (Notable)
Wentworth 2.5 WNW	United States	Record daily precipitation	33.3 mm (1.3 in)	42 of 100 (Notable)
Wien	Austria	Record high maximum temperature	36.1 C (97.0 F)	41 of 100 (Notable)
Leliekloof	South Africa	Record daily precipitation	32.2 mm (1.3 in)	41 of 100 (Notable)
Kalkoenkrans (Pol)	South Africa	Record daily precipitation	30.0 mm (1.2 in)	41 of 100 (Notable)

Counts by Type and Timescale

582 records

Records set or tied on 17 August 1974 by type: Highest daily maximum 64, Lowest daily maximum 27, Highest daily minimum 87, Lowest daily minimum 42, Heaviest daily rainfall 360, Heaviest daily snowfall 1, Deepest snow cover 1.

Records on 17 August 1974 by type
Record type	Records
Highest daily maximum	64
Lowest daily maximum	27
Highest daily minimum	87
Lowest daily minimum	42
Heaviest daily rainfall	360
Heaviest daily snowfall	1
Deepest snow cover	1

Records on 17 August 1974 by timescale: all-time 0, monthly 35, daily 547.

How Much Records Were Beaten By

506 broken records

Margins by which the 506 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 584.0. Ties are not counted.

Top 20 by Significance

17 August 1974

Top 20 records on 17 August 1974 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 August 1974	Noupoort, ZA	daily rain	56.0 mm (2.2 in)	50.7 mm (2.0 in)	68 years	69 of 100 (Major)
17 August 1974	Paulista, BR	monthly rain	65.2 mm (2.6 in)	65.2 mm (2.6 in)	36 years	63 of 100 (Major)
17 August 1974	Yardley Chase, ZA	daily rain	35.5 mm (1.4 in)	19.2 mm (0.8 in)	85 years	63 of 100 (Major)
17 August 1974	Hughenden, ZA	daily rain	34.0 mm (1.3 in)	29.7 mm (1.2 in)	60 years	61 of 100 (Major)
17 August 1974	Khosis, ZA	daily rain	30.0 mm (1.2 in)	30.0 mm (1.2 in)	56 years	61 of 100 (Major)
17 August 1974	Griquatown (Tnk), ZA	daily rain	37.5 mm (1.5 in)	26.6 mm (1.0 in)	87 years	59 of 100 (Notable)
17 August 1974	Springvalley, ZA	daily rain	39.0 mm (1.5 in)	32.6 mm (1.3 in)	39 years	57 of 100 (Notable)
17 August 1974	Waverley, ZA	daily rain	38.5 mm (1.5 in)	21.5 mm (0.8 in)	60 years	57 of 100 (Notable)
17 August 1974	Modderrivier (Pol), ZA	daily rain	25.0 mm (1.0 in)	25.0 mm (1.0 in)	59 years	57 of 100 (Notable)
17 August 1974	Olifantshoek (Pol), ZA	daily rain	34.0 mm (1.3 in)	34.0 mm (1.3 in)	55 years	57 of 100 (Notable)
17 August 1974	Tussenvier, ZA	daily rain	29.6 mm (1.2 in)	29.6 mm (1.2 in)	44 years	56 of 100 (Notable)
17 August 1974	De Rust, ZA	daily rain	53.5 mm (2.1 in)	33.4 mm (1.3 in)	60 years	55 of 100 (Notable)
17 August 1974	Silverstreams, ZA	daily rain	36.0 mm (1.4 in)	36.0 mm (1.4 in)	49 years	55 of 100 (Notable)
17 August 1974	Buffelsfontein 14, ZA	daily rain	45.5 mm (1.8 in)	24.4 mm (1.0 in)	60 years	54 of 100 (Notable)
17 August 1974	Philipstown (Tnk), ZA	monthly rain	50.0 mm (2.0 in)	18.8 mm (0.7 in)	30 years	54 of 100 (Notable)
17 August 1974	Wimbledon, ZA	daily rain	30.0 mm (1.2 in)	30.0 mm (1.2 in)	53 years	54 of 100 (Notable)
17 August 1974	Smythe, ZA	monthly rain	39.0 mm (1.5 in)	14.6 mm (0.6 in)	53 years	54 of 100 (Notable)
17 August 1974	Cleveland, US	daily rain	83.1 mm (3.3 in)	39.9 mm (1.6 in)	72 years	54 of 100 (Notable)
17 August 1974	Clarks Siding, ZA	daily rain	41.5 mm (1.6 in)	39.7 mm (1.6 in)	35 years	53 of 100 (Notable)
17 August 1974	Rooiwal, ZA	daily rain	42.0 mm (1.7 in)	35.6 mm (1.4 in)	29 years	53 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 1974

Records set or tied on this calendar date in each year from 1797 to 1974. 1974 had 582 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 1974-08-17: 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 100	505
100 to 200	0
200 to 300	0
300 to 400	0
400 to 500	0
500 to 600	1