Weather Records on 18 September 1978

1,162 weather records were set or tied worldwide on 18 September 1978. Highest significance: Mount Forest, CA.

Key Facts for 18 September 1978

On 18 September 1978, 1,162 weather records were set or tied at long-record stations worldwide.
350 were record highs and 347 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 81 monthly and 1,080 daily.
Mount Forest set a daily record precipitation of 52.5 mm (2.1 in) on 18 September 1978.
Across 163 earlier years (1803 to 2026) the same calendar date averaged 417 records.

Record Map

1,162 stations

1,162 station records on 18 September 1978 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 September 1978: highest significance records shown on the map
Station	Country	Type	Value	Significance
Mount Forest	Canada	Record daily precipitation	52.5 mm (2.1 in)	72 of 100 (Major)
Unionville	United States	Record daily precipitation	110.2 mm (4.3 in)	65 of 100 (Major)
Horton	United States	Record daily precipitation	91.9 mm (3.6 in)	64 of 100 (Major)
Spanish Fk Pwr House	United States	Record daily precipitation	44.2 mm (1.7 in)	62 of 100 (Major)
Southampton	Canada	Record daily precipitation	39.8 mm (1.6 in)	61 of 100 (Major)
Traverse Cy Cherry Capital AP	United States	Record daily precipitation	63.2 mm (2.5 in)	61 of 100 (Major)
Atchison	United States	Record daily precipitation	92.7 mm (3.6 in)	60 of 100 (Major)
Princeton	United States	Record daily precipitation	84.6 mm (3.3 in)	60 of 100 (Major)
Levan	United States	Record daily snowfall	14.0 cm (5.5 in)	60 of 100 (Major)
Fairfield	United States	Record daily precipitation	85.6 mm (3.4 in)	59 of 100 (Notable)
Trenton	United States	Record daily precipitation	142.5 mm (5.6 in)	58 of 100 (Notable)
Kanosh	United States	Record daily snowfall	10.2 cm (4.0 in)	58 of 100 (Notable)
Alta 1 NNW	United States	Record daily snowfall	15.5 cm (6.1 in)	58 of 100 (Notable)
Melstone	United States	Record daily precipitation	52.6 mm (2.1 in)	57 of 100 (Notable)
Beatrice	United States	Record daily precipitation	112.5 mm (4.4 in)	57 of 100 (Notable)
Chetwynd	Australia	Record daily precipitation	28.6 mm (1.1 in)	56 of 100 (Notable)
Beaver	United States	Record daily snowfall	10.4 cm (4.1 in)	56 of 100 (Notable)
Fillmore	United States	Record daily snowfall	12.7 cm (5.0 in)	56 of 100 (Notable)
Branxholme (Bassett)	Australia	Record daily precipitation	33.0 mm (1.3 in)	55 of 100 (Notable)
Billings Wtp	United States	Record daily precipitation	42.2 mm (1.7 in)	55 of 100 (Notable)
Woodruff	United States	Record daily precipitation	39.4 mm (1.6 in)	55 of 100 (Notable)
Woodruff	United States	Record daily snowfall	12.7 cm (5.0 in)	55 of 100 (Notable)
Keosauqua	United States	Record daily precipitation	88.9 mm (3.5 in)	54 of 100 (Notable)
Bethany	United States	Record daily precipitation	119.4 mm (4.7 in)	53 of 100 (Notable)
Holton	United States	Record daily precipitation	78.0 mm (3.1 in)	52 of 100 (Notable)
Kirksville	United States	Record daily precipitation	91.9 mm (3.6 in)	52 of 100 (Notable)
Padthaway (Marcollat)	Australia	Record daily precipitation	36.4 mm (1.4 in)	51 of 100 (Notable)
Verma	Norway	Record daily precipitation	34.6 mm (1.4 in)	51 of 100 (Notable)
Jordan	United States	Record daily precipitation	36.1 mm (1.4 in)	51 of 100 (Notable)
Echo Dam	United States	Record daily precipitation	42.9 mm (1.7 in)	51 of 100 (Notable)
Silver Lake Brighton	United States	Record daily snowfall	40.6 cm (16.0 in)	51 of 100 (Notable)
Utah Lake Lehi	United States	Record daily precipitation	33.0 mm (1.3 in)	51 of 100 (Notable)
Lake Yellowstone	United States	Record daily snowfall	15.2 cm (6.0 in)	51 of 100 (Notable)
Casterton (Warrock)	Australia	Record daily precipitation	33.0 mm (1.3 in)	50 of 100 (Notable)
Tahara	Australia	Record daily precipitation	43.6 mm (1.7 in)	50 of 100 (Notable)
Huntley Exp STN	United States	Record daily precipitation	25.4 mm (1.0 in)	50 of 100 (Notable)
Lustre 4 NNW	United States	Record daily precipitation	34.0 mm (1.3 in)	50 of 100 (Notable)
Mtn Dell Dam	United States	Record daily precipitation	61.2 mm (2.4 in)	50 of 100 (Notable)
Richmond	United States	Record daily snowfall	10.2 cm (4.0 in)	50 of 100 (Notable)
Silver Lake Brighton	United States	Record snow depth	40.6 cm (16.0 in)	50 of 100 (Notable)
Rock Springs	United States	Record daily snowfall	10.2 cm (4.0 in)	50 of 100 (Notable)
South Pass City	United States	Record daily snowfall	10.7 cm (4.2 in)	50 of 100 (Notable)
Greenfield	United States	Record daily precipitation	57.7 mm (2.3 in)	49 of 100 (Notable)
Flatwillow 4 ENE	United States	Record daily precipitation	34.0 mm (1.3 in)	49 of 100 (Notable)
Rapelje	United States	Record daily precipitation	34.3 mm (1.4 in)	49 of 100 (Notable)
Oak City	United States	Record daily precipitation	36.1 mm (1.4 in)	49 of 100 (Notable)
Billings Intl AP	United States	Record daily precipitation	50.0 mm (2.0 in)	48 of 100 (Notable)
Hanover 4 S	United States	Record daily precipitation	61.7 mm (2.4 in)	47 of 100 (Notable)
Lindsborg 3E	United States	Record daily precipitation	90.2 mm (3.6 in)	47 of 100 (Notable)
E Tawas	United States	Record daily precipitation	38.6 mm (1.5 in)	47 of 100 (Notable)
Polo	United States	Record daily precipitation	87.4 mm (3.4 in)	47 of 100 (Notable)
Eureka	United States	Record daily snowfall	15.2 cm (6.0 in)	47 of 100 (Notable)
Beaver Dam Wwtp	United States	Record daily precipitation	74.9 mm (2.9 in)	47 of 100 (Notable)
Border 3 N	United States	Record daily precipitation	34.3 mm (1.4 in)	47 of 100 (Notable)
Glasgow	United States	Record daily precipitation	32.3 mm (1.3 in)	47 of 100 (Notable)
Marrabel	Australia	Record daily precipitation	25.0 mm (1.0 in)	46 of 100 (Notable)
Ballantine	United States	Record daily precipitation	37.6 mm (1.5 in)	46 of 100 (Notable)
Laketown	United States	Record daily snowfall	12.7 cm (5.0 in)	46 of 100 (Notable)
Second Valley (Spring Grove)	Australia	Record daily precipitation	25.4 mm (1.0 in)	45 of 100 (Notable)
Washington	United States	Record daily precipitation	83.3 mm (3.3 in)	45 of 100 (Notable)

Counts by Type and Timescale

1,162 records

Records set or tied on 18 September 1978 by type: Highest daily maximum 71, Lowest daily maximum 216, Highest daily minimum 279, Lowest daily minimum 131, Heaviest daily rainfall 394, Heaviest daily snowfall 52, Deepest snow cover 19.

Records on 18 September 1978 by type
Record type	Records
Highest daily maximum	71
Lowest daily maximum	216
Highest daily minimum	279
Lowest daily minimum	131
Heaviest daily rainfall	394
Heaviest daily snowfall	52
Deepest snow cover	19

Records on 18 September 1978 by timescale: all-time 1, monthly 81, daily 1,080.

How Much Records Were Beaten By

921 broken records

Margins by which the 921 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 203.0. Ties are not counted.

Top 20 by Significance

18 September 1978

Top 20 records on 18 September 1978 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 September 1978	Mount Forest, CA	daily rain	52.5 mm (2.1 in)	32.9 mm (1.3 in)	82 years	72 of 100 (Major)
18 September 1978	Unionville, US	daily rain	110.2 mm (4.3 in)	82.3 mm (3.2 in)	59 years	65 of 100 (Major)
18 September 1978	Horton, US	daily rain	91.9 mm (3.6 in)	56.3 mm (2.2 in)	72 years	64 of 100 (Major)
18 September 1978	Spanish Fk Pwr House, US	daily rain	44.2 mm (1.7 in)	32.8 mm (1.3 in)	52 years	62 of 100 (Major)
18 September 1978	Southampton, CA	daily rain	39.8 mm (1.6 in)	22.0 mm (0.9 in)	78 years	61 of 100 (Major)
18 September 1978	Traverse Cy Cherry Capital AP, US	daily rain	63.2 mm (2.5 in)	40.3 mm (1.6 in)	52 years	61 of 100 (Major)
18 September 1978	Atchison, US	daily rain	92.7 mm (3.6 in)	54.3 mm (2.1 in)	72 years	60 of 100 (Major)
18 September 1978	Princeton, US	daily rain	84.6 mm (3.3 in)	49.5 mm (1.9 in)	81 years	60 of 100 (Major)
18 September 1978	Levan, US	daily snowfall	14.0 cm (5.5 in)	14.0 cm (5.5 in)	82 years	60 of 100 (Major)
18 September 1978	Fairfield, US	daily rain	85.6 mm (3.4 in)	48.5 mm (1.9 in)	63 years	59 of 100 (Notable)
18 September 1978	Trenton, US	daily rain	142.5 mm (5.6 in)	103.9 mm (4.1 in)	36 years	58 of 100 (Notable)
18 September 1978	Kanosh, US	monthly snowfall	10.2 cm (4.0 in)	10.2 cm (4.0 in)	70 years	58 of 100 (Notable)
18 September 1978	Alta 1 NNW, US	daily snowfall	15.5 cm (6.1 in)	15.5 cm (6.1 in)	68 years	58 of 100 (Notable)
18 September 1978	Melstone, US	daily rain	52.6 mm (2.1 in)	37.9 mm (1.5 in)	36 years	57 of 100 (Notable)
18 September 1978	Beatrice, US	daily rain	112.5 mm (4.4 in)	45.4 mm (1.8 in)	72 years	57 of 100 (Notable)
18 September 1978	Chetwynd, AU	daily rain	28.6 mm (1.1 in)	15.1 mm (0.6 in)	75 years	56 of 100 (Notable)
18 September 1978	Beaver, US	monthly snowfall	10.4 cm (4.1 in)	10.4 cm (4.1 in)	60 years	56 of 100 (Notable)
18 September 1978	Fillmore, US	daily snowfall	12.7 cm (5.0 in)	12.7 cm (5.0 in)	76 years	56 of 100 (Notable)
18 September 1978	Branxholme (Bassett), AU	daily rain	33.0 mm (1.3 in)	14.7 mm (0.6 in)	64 years	55 of 100 (Notable)
18 September 1978	Billings Wtp, US	daily rain	42.2 mm (1.7 in)	28.0 mm (1.1 in)	36 years	55 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

1803 to 1978

Records set or tied on this calendar date in each year from 1803 to 1978. 1978 had 1,162 records.

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

Records on 09-18 in each year
Year	Records
1803	1
1811	1
1814	1
1819	1
1829	1
1832	1
1834	1
1835	1
1837	2
1847	2
1848	1
1849	1
1851	4
1859	1
1861	1
1865	1
1869	1
1871	1
1875	1
1876	2
1877	1
1879	1
1880	1
1881	1
1882	1
1885	1
1886	4
1889	6
1890	1
1891	1
1893	4
1894	2
1895	2
1896	4
1897	3
1898	5
1899	3
1900	2
1901	10
1902	8
1903	58
1904	6
1905	22
1906	16
1907	4
1908	11
1909	17
1910	5
1911	8
1912	43
1913	44
1914	56
1915	41
1916	58
1917	99
1918	57
1919	48
1920	56
1921	213
1922	45
1923	114
1924	62
1925	269
1926	205
1927	189
1928	114
1929	309
1930	124
1931	429
1932	226
1933	370
1934	188
1935	281
1936	155
1937	422
1938	373
1939	190
1940	402
1941	318
1942	1,001
1943	624
1944	503
1945	732
1946	576
1947	927
1948	427
1949	356
1950	370
1951	320
1952	340
1953	245
1954	446
1955	672
1956	587
1957	429
1958	491
1959	829
1960	351
1961	478
1962	360
1963	453
1964	282
1965	1,172
1966	498
1967	357
1968	763
1969	424
1970	377
1971	1,245
1972	691
1973	593
1974	559
1975	976
1976	615
1977	619
1978	1,162
1979	709
1980	652
1981	1,671
1982	603
1983	936
1984	951
1985	636
1986	730
1987	1,244
1988	997
1989	778
1990	904
1991	1,377
1992	821
1993	747
1994	852
1995	935
1996	1,237
1997	935
1998	1,038
1999	583
2000	1,146
2001	993
2002	828
2003	815
2004	1,027
2005	781
2006	1,309
2007	670
2008	697
2009	692
2010	1,040
2011	1,050
2012	922
2013	666
2014	682
2015	934
2016	893
2017	518
2018	1,200
2019	768
2020	682
2021	582
2022	613
2023	639
2024	687
2025	471
2026	864

Download the Data

Data for records on 1978-09-18: 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).

Histogram of margins by which records were beaten on 18 September 1978
Margin	Records
0 to 50	869
50 to 100	31
100 to 150	14
150 to 200	5
200 to 250	2