Weather Records on 17 September 1978

764 weather records were set or tied worldwide on 17 September 1978. Highest significance: Namdalseid, NO.

Key Facts for 17 September 1978

On 17 September 1978, 764 weather records were set or tied at long-record stations worldwide.
278 were record highs and 153 were record lows, counting maximum and minimum temperature.
By timescale, 4 were all-time records, 16 monthly and 744 daily.
Namdalseid set a daily record precipitation of 64.1 mm (2.5 in) on 17 September 1978.
Across 164 earlier years (1796 to 2026) the same calendar date averaged 421 records.

Record Map

764 stations

764 station records on 17 September 1978 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 September 1978: highest significance records shown on the map
Station	Country	Type	Value	Significance
Namdalseid	Norway	Record daily precipitation	64.1 mm (2.5 in)	65 of 100 (Major)
Tafjord	Norway	Record daily precipitation	103.6 mm (4.1 in)	64 of 100 (Major)
Yalta	Ukraine	Record daily precipitation	35.4 mm (1.4 in)	62 of 100 (Major)
Verma	Norway	Record daily precipitation	82.8 mm (3.3 in)	54 of 100 (Notable)
Alpine	United States	Record daily precipitation	41.1 mm (1.6 in)	54 of 100 (Notable)
Visconde de Rio Claro	Brazil	Record daily precipitation	53.5 mm (2.1 in)	53 of 100 (Notable)
Estacao Experimental	Brazil	Record daily precipitation	52.5 mm (2.1 in)	50 of 100 (Notable)
Timbauba	Brazil	Record daily precipitation	75.8 mm (3.0 in)	50 of 100 (Notable)
Chaco Canyon Natl Mon	United States	Record daily precipitation	26.4 mm (1.0 in)	50 of 100 (Notable)
Usina Do Lobo	Brazil	Record daily precipitation	55.2 mm (2.2 in)	49 of 100 (Notable)
Kjobli I Snaasa	Norway	Record daily precipitation	29.0 mm (1.1 in)	49 of 100 (Notable)
Novoselenginsk	Russia	Record daily precipitation	43.9 mm (1.7 in)	49 of 100 (Notable)
Utica Starved Rock Dam	United States	Record daily precipitation	78.5 mm (3.1 in)	49 of 100 (Notable)
Itaiquara	Brazil	Record daily precipitation	50.3 mm (2.0 in)	48 of 100 (Notable)
Mococa C4-018	Brazil	Record daily precipitation	51.0 mm (2.0 in)	48 of 100 (Notable)
Ostas I Hegra	Norway	Record daily precipitation	39.6 mm (1.6 in)	47 of 100 (Notable)
Streator 2SE	United States	Record daily precipitation	73.7 mm (2.9 in)	47 of 100 (Notable)
Auburn 5 ESE	United States	Record daily precipitation	50.0 mm (2.0 in)	46 of 100 (Notable)
Topeka ASOS	United States	Record daily precipitation	63.8 mm (2.5 in)	46 of 100 (Notable)
Salt Lake City Intl AP	United States	Record daily precipitation	35.1 mm (1.4 in)	46 of 100 (Notable)
Nova Trento	Brazil	Record daily precipitation	64.6 mm (2.5 in)	45 of 100 (Notable)
Fazenda Guaxupe	Brazil	Record daily precipitation	51.3 mm (2.0 in)	45 of 100 (Notable)
Aktse	Sweden	Record daily precipitation	70.2 mm (2.8 in)	45 of 100 (Notable)
Wilmington 3 N	United States	Record daily precipitation	49.8 mm (2.0 in)	45 of 100 (Notable)
Hornindal	Norway	Record daily precipitation	78.6 mm (3.1 in)	44 of 100 (Notable)
Norddal	Norway	Record daily precipitation	70.8 mm (2.8 in)	44 of 100 (Notable)
Koskats	Sweden	Record daily precipitation	37.3 mm (1.5 in)	43 of 100 (Notable)
Keg River	Canada	Record daily precipitation	31.5 mm (1.2 in)	42 of 100 (Notable)
Astana	Kazakhstan	Record high minimum temperature	15.3 C (59.5 F)	41 of 100 (Notable)
Baksjonaset	Sweden	Record daily precipitation	25.5 mm (1.0 in)	41 of 100 (Notable)
Ottawa 4SW	United States	Record daily precipitation	62.5 mm (2.5 in)	41 of 100 (Notable)
Vargem Grande Do Sul	Brazil	Record daily precipitation	36.9 mm (1.5 in)	39 of 100 (Notable)
Mococa	Brazil	Record daily precipitation	52.5 mm (2.1 in)	39 of 100 (Notable)
Usina Quatiara	Brazil	Record daily precipitation	43.2 mm (1.7 in)	39 of 100 (Notable)
Beloit	United States	Record daily precipitation	39.1 mm (1.5 in)	39 of 100 (Notable)
Piraju	Brazil	Record daily precipitation	43.0 mm (1.7 in)	38 of 100 (Notable)
Palmas de Monte Alto	Brazil	Record daily precipitation	25.4 mm (1.0 in)	38 of 100 (Notable)
Elk	United States	Record high minimum temperature	15.0 C (59.0 F)	38 of 100 (Notable)
Spencer	United States	Record daily precipitation	45.7 mm (1.8 in)	38 of 100 (Notable)
Hamakuapoko 485	United States	Record daily precipitation	27.9 mm (1.1 in)	38 of 100 (Notable)
Concordia ASOS	United States	Record daily precipitation	55.4 mm (2.2 in)	38 of 100 (Notable)
Geneseo	United States	Record daily precipitation	85.9 mm (3.4 in)	37 of 100 (Notable)
Bloomingdale	United States	Record daily precipitation	49.5 mm (1.9 in)	37 of 100 (Notable)
Cresciumal	Brazil	Record daily precipitation	29.6 mm (1.2 in)	36 of 100 (Notable)
Los Gatos	United States	Record low minimum temperature	4.4 C (39.9 F)	36 of 100 (Notable)
Marseilles Lock/Dam	United States	Record daily precipitation	60.2 mm (2.4 in)	36 of 100 (Notable)
Brillion	United States	Record daily precipitation	31.8 mm (1.3 in)	36 of 100 (Notable)
Tarkio	United States	Record daily precipitation	47.0 mm (1.9 in)	36 of 100 (Notable)
Sandnas	Sweden	Record daily precipitation	34.6 mm (1.4 in)	35 of 100 (Notable)
Palkem	Sweden	Record daily precipitation	48.9 mm (1.9 in)	35 of 100 (Notable)
Tjamotis	Sweden	Record daily precipitation	26.0 mm (1.0 in)	35 of 100 (Notable)
Tapiratiba	Brazil	Record daily precipitation	60.4 mm (2.4 in)	34 of 100 (Routine)
Aracatuba (Emsa)	Brazil	Record daily precipitation	35.4 mm (1.4 in)	34 of 100 (Routine)
Fazenda Nova Niagara	Brazil	Record daily precipitation	36.6 mm (1.4 in)	34 of 100 (Routine)
Indaiatuba	Brazil	Record daily precipitation	42.4 mm (1.7 in)	34 of 100 (Routine)
Grimsby	Canada	Record daily precipitation	52.8 mm (2.1 in)	34 of 100 (Routine)
Colonia Empleado	Mexico	Record daily precipitation	109.2 mm (4.3 in)	34 of 100 (Routine)
Vila Carmem	Brazil	Record daily precipitation	45.0 mm (1.8 in)	33 of 100 (Routine)
Fazenda Do Barreiro Rico	Brazil	Record daily precipitation	37.8 mm (1.5 in)	33 of 100 (Routine)
Lifton Pumping STN	United States	Record daily precipitation	29.2 mm (1.1 in)	33 of 100 (Routine)

Counts by Type and Timescale

764 records

Records set or tied on 17 September 1978 by type: Highest daily maximum 57, Lowest daily maximum 72, Highest daily minimum 221, Lowest daily minimum 81, Heaviest daily rainfall 324, Heaviest daily snowfall 7, Deepest snow cover 2.

Records on 17 September 1978 by type
Record type	Records
Highest daily maximum	57
Lowest daily maximum	72
Highest daily minimum	221
Lowest daily minimum	81
Heaviest daily rainfall	324
Heaviest daily snowfall	7
Deepest snow cover	2

Records on 17 September 1978 by timescale: all-time 4, monthly 16, daily 744.

How Much Records Were Beaten By

587 broken records

Margins by which the 587 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 300.0. Ties are not counted.

Top 20 by Significance

17 September 1978

Top 20 records on 17 September 1978 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 September 1978	Namdalseid, NO	daily rain	64.1 mm (2.5 in)	33.5 mm (1.3 in)	59 years	65 of 100 (Major)
17 September 1978	Tafjord, NO	all-time rain	103.6 mm (4.1 in)	30.1 mm (1.2 in)	2 years	64 of 100 (Major)
17 September 1978	Yalta, UA	daily rain	35.4 mm (1.4 in)	23.8 mm (0.9 in)	83 years	62 of 100 (Major)
17 September 1978	Verma, NO	all-time rain	82.8 mm (3.3 in)	17.7 mm (0.7 in)	3 years	54 of 100 (Notable)
17 September 1978	Alpine, US	daily rain	41.1 mm (1.6 in)	30.2 mm (1.2 in)	31 years	54 of 100 (Notable)
17 September 1978	Visconde de Rio Claro, BR	daily rain	53.5 mm (2.1 in)	45.1 mm (1.8 in)	36 years	53 of 100 (Notable)
17 September 1978	Estacao Experimental, BR	daily rain	52.5 mm (2.1 in)	47.2 mm (1.9 in)	25 years	50 of 100 (Notable)
17 September 1978	Timbauba, BR	daily rain	75.8 mm (3.0 in)	53.1 mm (2.1 in)	16 years	50 of 100 (Notable)
17 September 1978	Chaco Canyon Natl Mon, US	daily rain	26.4 mm (1.0 in)	16.2 mm (0.6 in)	52 years	50 of 100 (Notable)
17 September 1978	Usina Do Lobo, BR	daily rain	55.2 mm (2.2 in)	52.7 mm (2.1 in)	17 years	49 of 100 (Notable)
17 September 1978	Kjobli I Snaasa, NO	daily rain	29.0 mm (1.1 in)	13.2 mm (0.5 in)	59 years	49 of 100 (Notable)
17 September 1978	Novoselenginsk, RU	monthly rain	43.9 mm (1.7 in)	15.4 mm (0.6 in)	5 years	49 of 100 (Notable)
17 September 1978	Utica Starved Rock Dam, US	daily rain	78.5 mm (3.1 in)	65.8 mm (2.6 in)	20 years	49 of 100 (Notable)
17 September 1978	Itaiquara, BR	daily rain	50.3 mm (2.0 in)	42.3 mm (1.7 in)	36 years	48 of 100 (Notable)
17 September 1978	Mococa C4-018, BR	daily rain	51.0 mm (2.0 in)	39.6 mm (1.6 in)	39 years	48 of 100 (Notable)
17 September 1978	Ostas I Hegra, NO	daily rain	39.6 mm (1.6 in)	16.6 mm (0.7 in)	59 years	47 of 100 (Notable)
17 September 1978	Streator 2SE, US	daily rain	73.7 mm (2.9 in)	54.9 mm (2.2 in)	4 years	47 of 100 (Notable)
17 September 1978	Auburn 5 ESE, US	daily rain	50.0 mm (2.0 in)	36.0 mm (1.4 in)	55 years	46 of 100 (Notable)
17 September 1978	Topeka ASOS, US	daily rain	63.8 mm (2.5 in)	56.4 mm (2.2 in)	12 years	46 of 100 (Notable)
17 September 1978	Salt Lake City Intl AP, US	daily rain	35.1 mm (1.4 in)	28.5 mm (1.1 in)	16 years	46 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 1978

Records set or tied on this calendar date in each year from 1796 to 1978. 1978 had 764 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 1978-09-17: 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 50	580
50 to 100	6
100 to 150	0
150 to 200	0
200 to 250	0
250 to 300	1