Weather Records on 20 August 1964

629 weather records were set or tied worldwide on 20 August 1964. Highest significance: Winifred, US.

Key Facts for 20 August 1964

On 20 August 1964, 629 weather records were set or tied at long-record stations worldwide.
58 were record highs and 403 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 27 monthly and 602 daily.
Winifred set a monthly record daily precipitation of 54.4 mm (2.1 in) on 20 August 1964.
Across 163 earlier years (1797 to 2026) the same calendar date averaged 454 records.

Record Map

629 stations

629 station records on 20 August 1964 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 August 1964: highest significance records shown on the map
Station	Country	Type	Value	Significance
Winifred	United States	Record daily precipitation	54.4 mm (2.1 in)	63 of 100 (Major)
Grass Range	United States	Record daily precipitation	34.8 mm (1.4 in)	59 of 100 (Notable)
Jordan	United States	Record daily precipitation	32.0 mm (1.3 in)	58 of 100 (Notable)
Melstone	United States	Record daily precipitation	56.4 mm (2.2 in)	57 of 100 (Notable)
Sulitjelma	Norway	Record daily precipitation	33.7 mm (1.3 in)	56 of 100 (Notable)
Busby	United States	Record daily precipitation	38.4 mm (1.5 in)	55 of 100 (Notable)
Flatwillow 4 ENE	United States	Record daily precipitation	37.3 mm (1.5 in)	54 of 100 (Notable)
Mehgawan	India	Record daily precipitation	200.0 mm (7.9 in)	49 of 100 (Notable)
Roundup	United States	Record daily precipitation	29.5 mm (1.2 in)	49 of 100 (Notable)
Kurgan	Russia	Record daily precipitation	38.2 mm (1.5 in)	48 of 100 (Notable)
Belleville	Canada	Record low maximum temperature	16.7 C (62.1 F)	47 of 100 (Notable)
Seoni	India	Record daily precipitation	212.4 mm (8.4 in)	47 of 100 (Notable)
Rajpur	India	Record daily precipitation	100.0 mm (3.9 in)	46 of 100 (Notable)
Orleans 2 W	United States	Record daily precipitation	86.4 mm (3.4 in)	46 of 100 (Notable)
Deaver	United States	Record daily precipitation	31.8 mm (1.3 in)	46 of 100 (Notable)
Chintakunta	India	Record daily precipitation	143.8 mm (5.7 in)	44 of 100 (Notable)
Grenfell	Canada	Record daily precipitation	34.3 mm (1.4 in)	43 of 100 (Notable)
Minas Nuevas	Mexico	Record low minimum temperature	13.9 C (57.0 F)	42 of 100 (Notable)
Walden	United States	Record low maximum temperature	12.8 C (55.0 F)	42 of 100 (Notable)
Toronto	Canada	Record low maximum temperature	17.8 C (64.0 F)	41 of 100 (Notable)
Beaver City	United States	Record daily precipitation	51.1 mm (2.0 in)	41 of 100 (Notable)
Central City	United States	Record daily precipitation	43.2 mm (1.7 in)	41 of 100 (Notable)
Brookings 2 NE	United States	Record daily precipitation	33.0 mm (1.3 in)	41 of 100 (Notable)
Lewistown AP	United States	Record daily precipitation	67.8 mm (2.7 in)	41 of 100 (Notable)
Tecumseh 1S	United States	Record daily precipitation	80.0 mm (3.1 in)	40 of 100 (Notable)
Palana	India	Record daily precipitation	89.0 mm (3.5 in)	39 of 100 (Notable)
Quinter	United States	Record daily precipitation	38.1 mm (1.5 in)	39 of 100 (Notable)
Big Timber	United States	Record low maximum temperature	13.9 C (57.0 F)	39 of 100 (Notable)
Sao Jose de Mipibu	Brazil	Record daily precipitation	50.2 mm (2.0 in)	38 of 100 (Notable)
Forsyth 2 E	United States	Record low maximum temperature	12.8 C (55.0 F)	38 of 100 (Notable)
Falun	Sweden	Record daily precipitation	31.5 mm (1.2 in)	37 of 100 (Notable)
Malta	United States	Record daily precipitation	25.9 mm (1.0 in)	37 of 100 (Notable)
Lichtentanne	Germany	Record low maximum temperature	15.3 C (59.5 F)	36 of 100 (Notable)
Asifabad(Rev)	India	Record daily precipitation	96.0 mm (3.8 in)	36 of 100 (Notable)
Holdrege	United States	Record daily precipitation	44.5 mm (1.8 in)	36 of 100 (Notable)
Fillmore	United States	Record low minimum temperature	3.9 C (39.0 F)	36 of 100 (Notable)
Ponnamaravathi	India	Record daily precipitation	74.0 mm (2.9 in)	35 of 100 (Notable)
Wakeeney	United States	Record daily precipitation	34.3 mm (1.4 in)	35 of 100 (Notable)
Cambridge	United States	Record daily precipitation	91.4 mm (3.6 in)	35 of 100 (Notable)
Elwood 8 S	United States	Record daily precipitation	49.3 mm (1.9 in)	35 of 100 (Notable)
Frankfort	United States	Record daily precipitation	26.4 mm (1.0 in)	34 of 100 (Routine)
Alma	United States	Record daily precipitation	69.9 mm (2.8 in)	34 of 100 (Routine)
Deseret	United States	Record low maximum temperature	22.2 C (72.0 F)	34 of 100 (Routine)
Arvi	India	Record daily precipitation	104.0 mm (4.1 in)	33 of 100 (Routine)
Ballantine	United States	Record low maximum temperature	12.8 C (55.0 F)	33 of 100 (Routine)
Bridger 2 N	United States	Record low maximum temperature	14.4 C (57.9 F)	33 of 100 (Routine)
Miles City	United States	Record low maximum temperature	17.2 C (63.0 F)	33 of 100 (Routine)
Moran 5WNW	United States	Record low maximum temperature	10.6 C (51.1 F)	33 of 100 (Routine)
Glenwood 3SW	United States	Record daily precipitation	48.8 mm (1.9 in)	32 of 100 (Routine)
Artichoke Lake 1 E	United States	Record daily precipitation	39.6 mm (1.6 in)	32 of 100 (Routine)
Levan	United States	Record low minimum temperature	3.9 C (39.0 F)	32 of 100 (Routine)
Border 3 N	United States	Record low maximum temperature	16.7 C (62.1 F)	32 of 100 (Routine)
Baridpur	India	Record daily precipitation	100.3 mm (3.9 in)	31 of 100 (Routine)
San Jose	United States	Record high maximum temperature	36.7 C (98.1 F)	31 of 100 (Routine)
McGill	United States	Record low minimum temperature	3.9 C (39.0 F)	31 of 100 (Routine)
Gillette 3SE	United States	Record low minimum temperature	0.0 C (32.0 F)	31 of 100 (Routine)
Lankaran	Azerbaijan	Record daily precipitation	53.3 mm (2.1 in)	30 of 100 (Routine)
Spicer	United States	Record low maximum temperature	11.7 C (53.1 F)	30 of 100 (Routine)
Driggs	United States	Record low maximum temperature	13.9 C (57.0 F)	30 of 100 (Routine)
Bozeman Montana State UNIV	United States	Record low maximum temperature	12.2 C (54.0 F)	30 of 100 (Routine)

Counts by Type and Timescale

629 records

Records set or tied on 20 August 1964 by type: Highest daily maximum 22, Lowest daily maximum 249, Highest daily minimum 36, Lowest daily minimum 154, Heaviest daily rainfall 168.

Records on 20 August 1964 by type
Record type	Records
Highest daily maximum	22
Lowest daily maximum	249
Highest daily minimum	36
Lowest daily minimum	154
Heaviest daily rainfall	168
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 20 August 1964 by timescale: all-time 0, monthly 27, daily 602.

How Much Records Were Beaten By

505 broken records

Margins by which the 505 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 118.7. Ties are not counted.

Top 20 by Significance

20 August 1964

Top 20 records on 20 August 1964 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 August 1964	Winifred, US	monthly rain	54.4 mm (2.1 in)	23.9 mm (0.9 in)	30 years	63 of 100 (Major)
20 August 1964	Grass Range, US	daily rain	34.8 mm (1.4 in)	26.2 mm (1.0 in)	49 years	59 of 100 (Notable)
20 August 1964	Jordan, US	daily rain	32.0 mm (1.3 in)	26.9 mm (1.1 in)	58 years	58 of 100 (Notable)
20 August 1964	Melstone, US	monthly rain	56.4 mm (2.2 in)	29.0 mm (1.1 in)	7 years	57 of 100 (Notable)
20 August 1964	Sulitjelma, NO	daily rain	33.7 mm (1.3 in)	22.6 mm (0.9 in)	32 years	56 of 100 (Notable)
20 August 1964	Busby, US	daily rain	38.4 mm (1.5 in)	25.7 mm (1.0 in)	52 years	55 of 100 (Notable)
20 August 1964	Flatwillow 4 ENE, US	daily rain	37.3 mm (1.5 in)	31.7 mm (1.2 in)	31 years	54 of 100 (Notable)
20 August 1964	Mehgawan, IN	daily rain	200.0 mm (7.9 in)	118.7 mm (4.7 in)	11 years	49 of 100 (Notable)
20 August 1964	Roundup, US	daily rain	29.5 mm (1.2 in)	18.1 mm (0.7 in)	34 years	49 of 100 (Notable)
20 August 1964	Kurgan, RU	daily rain	38.2 mm (1.5 in)	34.0 mm (1.3 in)	4 years	48 of 100 (Notable)
20 August 1964	Belleville, CA	daily low max	16.7 C (62.1 F)	3.3 C (5.9 F)	97 years	47 of 100 (Notable)
20 August 1964	Seoni, IN	daily rain	212.4 mm (8.4 in)	102.7 mm (4.0 in)	25 years	47 of 100 (Notable)
20 August 1964	Rajpur, IN	daily rain	100.0 mm (3.9 in)	69.5 mm (2.7 in)	25 years	46 of 100 (Notable)
20 August 1964	Orleans 2 W, US	daily rain	86.4 mm (3.4 in)	58.5 mm (2.3 in)	31 years	46 of 100 (Notable)
20 August 1964	Deaver, US	monthly rain	31.8 mm (1.3 in)	8.9 mm (0.35 in)	34 years	46 of 100 (Notable)
20 August 1964	Chintakunta, IN	daily rain	143.8 mm (5.7 in)	75.7 mm (3.0 in)	27 years	44 of 100 (Notable)
20 August 1964	Grenfell, CA	daily rain	34.3 mm (1.4 in)	10.7 mm (0.4 in)	76 years	43 of 100 (Notable)
20 August 1964	Minas Nuevas, MX	daily low min	13.9 C (57.0 F)	4.4 C (7.9 F)	18 years	42 of 100 (Notable)
20 August 1964	Walden, US	daily low max	12.8 C (55.0 F)	5.5 C (9.9 F)	63 years	42 of 100 (Notable)
20 August 1964	Toronto, CA	daily low max	17.8 C (64.0 F)	0.5 C (0.9 F)	112 years	41 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 1964

Records set or tied on this calendar date in each year from 1797 to 1964. 1964 had 629 records.

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

Records on 08-20 in each year
Year	Records
1797	1
1807	1
1809	2
1816	1
1830	1
1832	1
1838	1
1840	1
1842	1
1846	1
1849	1
1850	1
1852	1
1858	3
1863	5
1867	4
1870	3
1871	1
1873	1
1875	2
1877	1
1883	2
1884	2
1885	6
1886	1
1888	1
1889	2
1890	2
1891	2
1892	6
1893	1
1894	1
1895	1
1896	5
1897	6
1898	1
1899	5
1900	7
1901	12
1902	3
1903	7
1904	30
1905	7
1906	26
1907	15
1908	21
1909	69
1910	7
1911	18
1912	25
1913	23
1914	15
1915	14
1916	74
1917	51
1918	69
1919	25
1920	47
1921	23
1922	52
1923	83
1924	132
1925	193
1926	187
1927	338
1928	101
1929	213
1930	318
1931	214
1932	299
1933	324
1934	376
1935	339
1936	543
1937	537
1938	250
1939	448
1940	695
1941	230
1942	429
1943	436
1944	355
1945	398
1946	349
1947	988
1948	403
1949	431
1950	1,341
1951	824
1952	425
1953	441
1954	476
1955	848
1956	678
1957	342
1958	281
1959	764
1960	465
1961	520
1962	684
1963	577
1964	629
1965	470
1966	1,094
1967	657
1968	862
1969	608
1970	414
1971	585
1972	522
1973	490
1974	565
1975	411
1976	894
1977	860
1978	563
1979	1,009
1980	991
1981	856
1982	620
1983	1,465
1984	696
1985	666
1986	819
1987	564
1988	991
1989	603
1990	1,262
1991	804
1992	1,168
1993	759
1994	719
1995	1,113
1996	900
1997	1,214
1998	802
1999	810
2000	989
2001	909
2002	1,208
2003	1,031
2004	1,333
2005	1,112
2006	851
2007	1,955
2008	1,170
2009	1,414
2010	1,028
2011	987
2012	1,086
2013	545
2014	582
2015	1,075
2016	872
2017	324
2018	657
2019	698
2020	1,051
2021	1,028
2022	1,038
2023	1,479
2024	589
2025	1,134
2026	985

Download the Data

Data for records on 1964-08-20: 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	467
20 to 40	25
40 to 60	8
60 to 80	3
80 to 100	0
100 to 120	2