Weather Records on 17 September 1970

412 weather records were set or tied worldwide on 17 September 1970. Highest significance: Bantwal, IN.

Key Facts for 17 September 1970

On 17 September 1970, 412 weather records were set or tied at long-record stations worldwide.
94 were record highs and 82 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 3 monthly and 408 daily.
Bantwal set a daily record precipitation of 131.2 mm (5.2 in) on 17 September 1970.
Across 164 earlier years (1796 to 2026) the same calendar date averaged 423 records.

Record Map

412 stations

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

Weather records on 17 September 1970: highest significance records shown on the map
Station	Country	Type	Value	Significance
Bantwal	India	Record daily precipitation	131.2 mm (5.2 in)	67 of 100 (Major)
Bassein	India	Record daily precipitation	190.0 mm (7.5 in)	61 of 100 (Major)
Conception	United States	Record daily precipitation	104.1 mm (4.1 in)	61 of 100 (Major)
McAlester Rgnl AP	United States	Record daily precipitation	84.8 mm (3.3 in)	56 of 100 (Notable)
Haveri	India	Record daily precipitation	83.5 mm (3.3 in)	55 of 100 (Notable)
Mt Carroll	United States	Record daily precipitation	67.8 mm (2.7 in)	55 of 100 (Notable)
Denton 2 SE	United States	Record daily precipitation	142.2 mm (5.6 in)	55 of 100 (Notable)
Hangal	India	Record daily precipitation	78.6 mm (3.1 in)	51 of 100 (Notable)
Iowa City	United States	Record daily precipitation	111.5 mm (4.4 in)	47 of 100 (Notable)
Oskaloosa	United States	Record daily precipitation	84.8 mm (3.3 in)	45 of 100 (Notable)
Sitio Sao Geraldo	Brazil	Record daily precipitation	53.1 mm (2.1 in)	44 of 100 (Notable)
Karwar	India	Record daily precipitation	97.2 mm (3.8 in)	44 of 100 (Notable)
Denison Dam	United States	Record daily precipitation	121.4 mm (4.8 in)	44 of 100 (Notable)
Forestburg 5 S	United States	Record daily precipitation	86.4 mm (3.4 in)	44 of 100 (Notable)
Puttur	India	Record daily precipitation	70.6 mm (2.8 in)	42 of 100 (Notable)
Badami	India	Record daily precipitation	80.2 mm (3.2 in)	41 of 100 (Notable)
Nargund	India	Record daily precipitation	60.9 mm (2.4 in)	41 of 100 (Notable)
Freeport	United States	Record daily precipitation	68.6 mm (2.7 in)	41 of 100 (Notable)
Anucino	Russia	Record daily precipitation	46.3 mm (1.8 in)	40 of 100 (Notable)
Eskdalemuir	United Kingdom	Record daily precipitation	43.2 mm (1.7 in)	40 of 100 (Notable)
Clarence	United States	Record daily precipitation	76.2 mm (3.0 in)	40 of 100 (Notable)
Gokak	India	Record daily precipitation	108.5 mm (4.3 in)	39 of 100 (Notable)
Morrison	United States	Record daily precipitation	47.2 mm (1.9 in)	39 of 100 (Notable)
Lamoni	United States	Record daily precipitation	56.4 mm (2.2 in)	39 of 100 (Notable)
Poonampet	India	Record daily precipitation	41.0 mm (1.6 in)	38 of 100 (Notable)
Karkal	India	Record daily precipitation	88.0 mm (3.5 in)	37 of 100 (Notable)
Fairhope 2 NE	United States	Record daily precipitation	80.0 mm (3.1 in)	37 of 100 (Notable)
Mount Alfred	Australia	Record daily precipitation	25.9 mm (1.0 in)	36 of 100 (Notable)
Coloso	Puerto Rico [United States]	Record daily precipitation	81.8 mm (3.2 in)	36 of 100 (Notable)
Sigourney	United States	Record daily precipitation	41.9 mm (1.6 in)	36 of 100 (Notable)
Marathon	United States	Record daily precipitation	48.3 mm (1.9 in)	36 of 100 (Notable)
Racine Wwtp	United States	Record daily precipitation	54.6 mm (2.1 in)	36 of 100 (Notable)
Karjat	India	Record daily precipitation	126.4 mm (5.0 in)	35 of 100 (Notable)
Holland Wtp	United States	Record daily precipitation	41.9 mm (1.6 in)	35 of 100 (Notable)
Saundatti	India	Record daily precipitation	87.0 mm (3.4 in)	34 of 100 (Routine)
Maquoketa	United States	Record daily precipitation	47.0 mm (1.9 in)	34 of 100 (Routine)
Dos Bocas	Puerto Rico [United States]	Record daily precipitation	82.6 mm (3.3 in)	33 of 100 (Routine)
Carrabelle 1 NNW	United States	Record high minimum temperature	25.6 C (78.1 F)	33 of 100 (Routine)
Waterloo 6SW	United States	Record daily precipitation	58.7 mm (2.3 in)	33 of 100 (Routine)
Valentine 10 WSW	United States	Record daily precipitation	34.5 mm (1.4 in)	33 of 100 (Routine)
Sagar	India	Record daily precipitation	39.6 mm (1.6 in)	32 of 100 (Routine)
Lucknow	India	Record daily precipitation	96.4 mm (3.8 in)	32 of 100 (Routine)
Holbrook	United States	Record high minimum temperature	17.8 C (64.0 F)	32 of 100 (Routine)
Woodstock	Canada	Record daily precipitation	36.8 mm (1.4 in)	31 of 100 (Routine)
Ankola	India	Record daily precipitation	52.6 mm (2.1 in)	31 of 100 (Routine)
Jath	India	Record daily precipitation	91.0 mm (3.6 in)	31 of 100 (Routine)
Columbus Junction	United States	Record daily precipitation	46.2 mm (1.8 in)	31 of 100 (Routine)
Jamkhandi	India	Record daily precipitation	49.3 mm (1.9 in)	30 of 100 (Routine)
Greenville 2 NNE	United States	Record daily precipitation	50.8 mm (2.0 in)	30 of 100 (Routine)
Van Horn	United States	Record daily precipitation	26.2 mm (1.0 in)	30 of 100 (Routine)
Mt Pleasant 1 SW	United States	Record daily precipitation	29.7 mm (1.2 in)	29 of 100 (Routine)
Tipton	United States	Record daily precipitation	109.2 mm (4.3 in)	29 of 100 (Routine)
Holdrege	United States	Record daily precipitation	38.9 mm (1.5 in)	29 of 100 (Routine)
Saint Paul	United States	Record daily precipitation	35.3 mm (1.4 in)	29 of 100 (Routine)
Caconde	Brazil	Record daily precipitation	28.9 mm (1.1 in)	28 of 100 (Routine)
Pattikonda	India	Record daily precipitation	75.2 mm (3.0 in)	28 of 100 (Routine)
Neran	Russia	Record daily precipitation	40.4 mm (1.6 in)	28 of 100 (Routine)
Alma	United States	Record daily precipitation	30.2 mm (1.2 in)	28 of 100 (Routine)
Cape May 2 NW	United States	Record high maximum temperature	33.9 C (93.0 F)	28 of 100 (Routine)
Yadgir	India	Record daily precipitation	81.3 mm (3.2 in)	27 of 100 (Routine)

Counts by Type and Timescale

412 records

Records set or tied on 17 September 1970 by type: Highest daily maximum 38, Lowest daily maximum 32, Highest daily minimum 56, Lowest daily minimum 50, Heaviest daily rainfall 235, Heaviest daily snowfall 1.

Records on 17 September 1970 by type
Record type	Records
Highest daily maximum	38
Lowest daily maximum	32
Highest daily minimum	56
Lowest daily minimum	50
Heaviest daily rainfall	235
Heaviest daily snowfall	1
Deepest snow cover	0

Records on 17 September 1970 by timescale: all-time 1, monthly 3, daily 408.

How Much Records Were Beaten By

335 broken records

Margins by which the 335 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 111.5. Ties are not counted.

Top 20 by Significance

17 September 1970

Top 20 records on 17 September 1970 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 September 1970	Bantwal, IN	daily rain	131.2 mm (5.2 in)	81.7 mm (3.2 in)	67 years	67 of 100 (Major)
17 September 1970	Bassein, IN	daily rain	190.0 mm (7.5 in)	101.1 mm (4.0 in)	68 years	61 of 100 (Major)
17 September 1970	Conception, US	daily rain	104.1 mm (4.1 in)	83.0 mm (3.3 in)	47 years	61 of 100 (Major)
17 September 1970	McAlester Rgnl AP, US	daily rain	84.8 mm (3.3 in)	63.7 mm (2.5 in)	57 years	56 of 100 (Notable)
17 September 1970	Haveri, IN	daily rain	83.5 mm (3.3 in)	63.2 mm (2.5 in)	29 years	55 of 100 (Notable)
17 September 1970	Mt Carroll, US	daily rain	67.8 mm (2.7 in)	46.7 mm (1.8 in)	63 years	55 of 100 (Notable)
17 September 1970	Denton 2 SE, US	daily rain	142.2 mm (5.6 in)	111.5 mm (4.4 in)	33 years	55 of 100 (Notable)
17 September 1970	Hangal, IN	daily rain	78.6 mm (3.1 in)	48.1 mm (1.9 in)	15 years	51 of 100 (Notable)
17 September 1970	Iowa City, US	daily rain	111.5 mm (4.4 in)	82.3 mm (3.2 in)	1 year	47 of 100 (Notable)
17 September 1970	Oskaloosa, US	daily rain	84.8 mm (3.3 in)	60.2 mm (2.4 in)	1 year	45 of 100 (Notable)
17 September 1970	Sitio Sao Geraldo, BR	daily rain	53.1 mm (2.1 in)	42.1 mm (1.7 in)	24 years	44 of 100 (Notable)
17 September 1970	Karwar, IN	daily rain	97.2 mm (3.8 in)	42.1 mm (1.7 in)	53 years	44 of 100 (Notable)
17 September 1970	Denison Dam, US	daily rain	121.4 mm (4.8 in)	84.1 mm (3.3 in)	20 years	44 of 100 (Notable)
17 September 1970	Forestburg 5 S, US	daily rain	86.4 mm (3.4 in)	68.6 mm (2.7 in)	17 years	44 of 100 (Notable)
17 September 1970	Puttur, IN	daily rain	70.6 mm (2.8 in)	26.7 mm (1.1 in)	68 years	42 of 100 (Notable)
17 September 1970	Badami, IN	daily rain	80.2 mm (3.2 in)	26.1 mm (1.0 in)	67 years	41 of 100 (Notable)
17 September 1970	Nargund, IN	daily rain	60.9 mm (2.4 in)	25.3 mm (1.0 in)	68 years	41 of 100 (Notable)
17 September 1970	Freeport, US	daily rain	68.6 mm (2.7 in)	50.3 mm (2.0 in)	12 years	41 of 100 (Notable)
17 September 1970	Anucino, RU	daily rain	46.3 mm (1.8 in)	32.9 mm (1.3 in)	15 years	40 of 100 (Notable)
17 September 1970	Eskdalemuir, GB	daily rain	43.2 mm (1.7 in)	24.0 mm (0.9 in)	32 years	40 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 1970

Records set or tied on this calendar date in each year from 1796 to 1970. 1970 had 412 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 1970-09-17: 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	283
20 to 40	31
40 to 60	10
60 to 80	5
80 to 100	4
100 to 120	2