Weather Records on 17 September 1964

559 weather records were set or tied worldwide on 17 September 1964. Highest significance: Port Alfred, ZA.

Key Facts for 17 September 1964

On 17 September 1964, 559 weather records were set or tied at long-record stations worldwide.
112 were record highs and 88 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 25 monthly and 534 daily.
Port Alfred set a daily record precipitation of 105.0 mm (4.1 in) on 17 September 1964.
Across 164 earlier years (1796 to 2026) the same calendar date averaged 422 records.

Record Map

559 stations

559 station records on 17 September 1964 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 September 1964: highest significance records shown on the map
Station	Country	Type	Value	Significance
Port Alfred	South Africa	Record daily precipitation	105.0 mm (4.1 in)	69 of 100 (Major)
Berlin (Sar)	South Africa	Record daily precipitation	65.0 mm (2.6 in)	60 of 100 (Major)
Malvern	United States	Record daily precipitation	110.7 mm (4.4 in)	60 of 100 (Major)
Alagoa Nova (Laranjeiras)	Brazil	Record daily precipitation	64.5 mm (2.5 in)	59 of 100 (Notable)
Prescott 2 NNW	United States	Record daily precipitation	137.2 mm (5.4 in)	54 of 100 (Notable)
Bergplaats (Bos)	South Africa	Record daily precipitation	82.5 mm (3.2 in)	53 of 100 (Notable)
Pilot Point Isl du Boi	United States	Record daily precipitation	98.6 mm (3.9 in)	52 of 100 (Notable)
Araruna	Brazil	Record daily precipitation	32.0 mm (1.3 in)	51 of 100 (Notable)
Kaslo	Canada	Record daily precipitation	26.4 mm (1.0 in)	51 of 100 (Notable)
Edna 3 SW	United States	Record daily precipitation	138.4 mm (5.4 in)	51 of 100 (Notable)
Belgaum	India	Record daily precipitation	64.2 mm (2.5 in)	49 of 100 (Notable)
Hope 3 NE	United States	Record daily precipitation	114.3 mm (4.5 in)	49 of 100 (Notable)
Bowie	United States	Record daily precipitation	62.7 mm (2.5 in)	47 of 100 (Notable)
Hallettsville 2 N	United States	Record daily precipitation	83.8 mm (3.3 in)	46 of 100 (Notable)
Falun	Sweden	Record daily precipitation	33.9 mm (1.3 in)	44 of 100 (Notable)
Trenton	United States	Record daily precipitation	63.2 mm (2.5 in)	44 of 100 (Notable)
Hempstead	United States	Record daily precipitation	66.0 mm (2.6 in)	44 of 100 (Notable)
Cedar Lake	United States	Record daily precipitation	56.4 mm (2.2 in)	44 of 100 (Notable)
Seattle Urban Site	United States	Record daily precipitation	30.0 mm (1.2 in)	44 of 100 (Notable)
Cascavel	Brazil	Record daily precipitation	25.0 mm (1.0 in)	43 of 100 (Notable)
Natal	Brazil	Record daily precipitation	25.8 mm (1.0 in)	43 of 100 (Notable)
Khanpur	India	Record daily precipitation	64.2 mm (2.5 in)	43 of 100 (Notable)
Plain Dealing	United States	Record daily precipitation	82.0 mm (3.2 in)	43 of 100 (Notable)
Manjeri	India	Record daily precipitation	177.5 mm (7.0 in)	42 of 100 (Notable)
Kei Road (Pol)	South Africa	Record daily precipitation	46.0 mm (1.8 in)	42 of 100 (Notable)
Lead Hill	United States	Record daily precipitation	71.6 mm (2.8 in)	42 of 100 (Notable)
Morrilton	United States	Record daily precipitation	72.9 mm (2.9 in)	41 of 100 (Notable)
Wynne	United States	Record daily precipitation	76.2 mm (3.0 in)	41 of 100 (Notable)
Carrollton	United States	Record daily precipitation	71.1 mm (2.8 in)	41 of 100 (Notable)
Danevang 1 W	United States	Record daily precipitation	80.8 mm (3.2 in)	41 of 100 (Notable)
McKenzie Rvr Rs	United States	Record daily precipitation	27.2 mm (1.1 in)	39 of 100 (Notable)
Bananeiras	Brazil	Record daily precipitation	36.0 mm (1.4 in)	38 of 100 (Notable)
Velikie Luki	Russia	Record high maximum temperature	25.5 C (77.9 F)	38 of 100 (Notable)
Velikie Luki	Russia	Record high minimum temperature	16.7 C (62.1 F)	38 of 100 (Notable)
Sugartown	United States	Record daily precipitation	77.5 mm (3.1 in)	38 of 100 (Notable)
Flatonia 4SE	United States	Record daily precipitation	86.4 mm (3.4 in)	38 of 100 (Notable)
Glacier Rs	United States	Record daily precipitation	38.1 mm (1.5 in)	38 of 100 (Notable)
Seattle UNIV of Washin	United States	Record daily precipitation	29.5 mm (1.2 in)	38 of 100 (Notable)
Sedro-Woolley	United States	Record daily precipitation	41.4 mm (1.6 in)	38 of 100 (Notable)
Grapevine Dam	United States	Record daily precipitation	117.3 mm (4.6 in)	37 of 100 (Notable)
Texarkana Webb Fld	United States	Record daily precipitation	44.2 mm (1.7 in)	37 of 100 (Notable)
Wangerooge	Germany	Record daily precipitation	26.8 mm (1.1 in)	36 of 100 (Notable)
Rio Grande City	United States	Record daily precipitation	57.2 mm (2.3 in)	36 of 100 (Notable)
Concrete Ppl Fish STN	United States	Record daily precipitation	30.5 mm (1.2 in)	36 of 100 (Notable)
Hughenden	Canada	Record daily precipitation	31.0 mm (1.2 in)	35 of 100 (Notable)
Opsoek (Pos)	South Africa	Record daily precipitation	40.0 mm (1.6 in)	35 of 100 (Notable)
Sidsjo	Sweden	Record daily precipitation	38.2 mm (1.5 in)	35 of 100 (Notable)
Oregon City	United States	Record daily precipitation	28.4 mm (1.1 in)	35 of 100 (Notable)
Hewitt	United States	Record daily precipitation	33.0 mm (1.3 in)	35 of 100 (Notable)
Kolhapur	India	Record daily precipitation	41.0 mm (1.6 in)	34 of 100 (Routine)
Conway	United States	Record daily precipitation	69.6 mm (2.7 in)	34 of 100 (Routine)
Arthur City	United States	Record daily precipitation	70.9 mm (2.8 in)	34 of 100 (Routine)
Bronson	United States	Record daily precipitation	36.6 mm (1.4 in)	34 of 100 (Routine)
Copperas Cove	United States	Record daily precipitation	59.2 mm (2.3 in)	34 of 100 (Routine)
Hillsboro	United States	Record daily precipitation	63.5 mm (2.5 in)	34 of 100 (Routine)
Waseca	Canada	Record daily precipitation	33.8 mm (1.3 in)	33 of 100 (Routine)
Fulton	United States	Record daily precipitation	130.8 mm (5.1 in)	33 of 100 (Routine)
Honey Grove	United States	Record daily precipitation	64.0 mm (2.5 in)	33 of 100 (Routine)
La Grange	United States	Record daily precipitation	116.8 mm (4.6 in)	33 of 100 (Routine)
Everett	United States	Record daily precipitation	27.9 mm (1.1 in)	33 of 100 (Routine)

Counts by Type and Timescale

559 records

Records set or tied on 17 September 1964 by type: Highest daily maximum 62, Lowest daily maximum 48, Highest daily minimum 50, Lowest daily minimum 40, Heaviest daily rainfall 359.

Records on 17 September 1964 by type
Record type	Records
Highest daily maximum	62
Lowest daily maximum	48
Highest daily minimum	50
Lowest daily minimum	40
Heaviest daily rainfall	359
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 17 September 1964 by timescale: all-time 0, monthly 25, daily 534.

How Much Records Were Beaten By

482 broken records

Margins by which the 482 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 88.4. Ties are not counted.

Top 20 by Significance

17 September 1964

Top 20 records on 17 September 1964 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 September 1964	Port Alfred, ZA	daily rain	105.0 mm (4.1 in)	61.3 mm (2.4 in)	71 years	69 of 100 (Major)
17 September 1964	Berlin (Sar), ZA	daily rain	65.0 mm (2.6 in)	50.5 mm (2.0 in)	59 years	60 of 100 (Major)
17 September 1964	Malvern, US	daily rain	110.7 mm (4.4 in)	80.2 mm (3.2 in)	42 years	60 of 100 (Major)
17 September 1964	Alagoa Nova (Laranjeiras), BR	daily rain	64.5 mm (2.5 in)	52.5 mm (2.1 in)	47 years	59 of 100 (Notable)
17 September 1964	Prescott 2 NNW, US	monthly rain	137.2 mm (5.4 in)	35.6 mm (1.4 in)	55 years	54 of 100 (Notable)
17 September 1964	Bergplaats (Bos), ZA	daily rain	82.5 mm (3.2 in)	53.3 mm (2.1 in)	32 years	53 of 100 (Notable)
17 September 1964	Pilot Point Isl du Boi, US	daily rain	98.6 mm (3.9 in)	88.4 mm (3.5 in)	28 years	52 of 100 (Notable)
17 September 1964	Araruna, BR	daily rain	32.0 mm (1.3 in)	20.0 mm (0.8 in)	50 years	51 of 100 (Notable)
17 September 1964	Kaslo, CA	daily rain	26.4 mm (1.0 in)	16.2 mm (0.6 in)	50 years	51 of 100 (Notable)
17 September 1964	Edna 3 SW, US	daily rain	138.4 mm (5.4 in)	60.9 mm (2.4 in)	51 years	51 of 100 (Notable)
17 September 1964	Belgaum, IN	daily rain	64.2 mm (2.5 in)	34.2 mm (1.3 in)	46 years	49 of 100 (Notable)
17 September 1964	Hope 3 NE, US	daily rain	114.3 mm (4.5 in)	59.2 mm (2.3 in)	41 years	49 of 100 (Notable)
17 September 1964	Bowie, US	daily rain	62.7 mm (2.5 in)	47.5 mm (1.9 in)	52 years	47 of 100 (Notable)
17 September 1964	Hallettsville 2 N, US	daily rain	83.8 mm (3.3 in)	41.6 mm (1.6 in)	51 years	46 of 100 (Notable)
17 September 1964	Falun, SE	daily rain	33.9 mm (1.3 in)	13.0 mm (0.5 in)	37 years	44 of 100 (Notable)
17 September 1964	Trenton, US	daily rain	63.2 mm (2.5 in)	34.2 mm (1.3 in)	59 years	44 of 100 (Notable)
17 September 1964	Hempstead, US	daily rain	66.0 mm (2.6 in)	48.2 mm (1.9 in)	42 years	44 of 100 (Notable)
17 September 1964	Cedar Lake, US	daily rain	56.4 mm (2.2 in)	30.5 mm (1.2 in)	55 years	44 of 100 (Notable)
17 September 1964	Seattle Urban Site, US	daily rain	30.0 mm (1.2 in)	22.4 mm (0.9 in)	10 years	44 of 100 (Notable)
17 September 1964	Cascavel, BR	monthly rain	25.0 mm (1.0 in)	6.7 mm (0.26 in)	51 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

1796 to 1964

Records set or tied on this calendar date in each year from 1796 to 1964. 1964 had 559 records.

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

Records on 09-17 in each year
Year	Records
1796	1
1797	1
1805	1
1833	1
1834	1
1837	2
1845	1
1847	3
1848	1
1850	1
1851	2
1853	2
1854	2
1859	1
1862	1
1867	1
1870	1
1871	1
1872	1
1873	1
1874	1
1875	1
1877	1
1881	1
1882	2
1884	3
1885	3
1886	6
1888	2
1889	8
1891	1
1893	3
1894	1
1895	4
1896	9
1897	4
1898	7
1899	1
1900	4
1901	5
1902	5
1903	28
1904	2
1905	17
1906	10
1907	15
1908	13
1909	7
1910	38
1911	15
1912	17
1913	28
1914	38
1915	48
1916	40
1917	255
1918	41
1919	21
1920	40
1921	66
1922	47
1923	159
1924	80
1925	338
1926	154
1927	420
1928	78
1929	168
1930	147
1931	564
1932	425
1933	415
1934	246
1935	321
1936	219
1937	463
1938	363
1939	294
1940	326
1941	328
1942	581
1943	513
1944	403
1945	614
1946	620
1947	680
1948	630
1949	292
1950	412
1951	359
1952	263
1953	344
1954	449
1955	649
1956	437
1957	405
1958	806
1959	1,210
1960	385
1961	657
1962	432
1963	297
1964	559
1965	1,394
1966	523
1967	331
1968	691
1969	352
1970	412
1971	898
1972	556
1973	638
1974	491
1975	478
1976	636
1977	641
1978	764
1979	804
1980	794
1981	1,155
1982	606
1983	862
1984	1,006
1985	448
1986	1,314
1987	926
1988	982
1989	863
1990	650
1991	1,407
1992	686
1993	950
1994	986
1995	1,145
1996	1,342
1997	1,057
1998	1,137
1999	1,102
2000	1,318
2001	895
2002	1,025
2003	586
2004	872
2005	1,042
2006	1,344
2007	752
2008	886
2009	871
2010	907
2011	1,116
2012	597
2013	1,253
2014	571
2015	953
2016	707
2017	455
2018	899
2019	774
2020	651
2021	345
2022	313
2023	646
2024	954
2025	634
2026	968

Download the Data

Data for records on 1964-09-17: 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	406
20 to 40	50
40 to 60	21
60 to 80	3
80 to 100	2