Weather Records on 18 September 1945

732 weather records were set or tied worldwide on 18 September 1945. Highest significance: Brockville, CA.

Key Facts for 18 September 1945

On 18 September 1945, 732 weather records were set or tied at long-record stations worldwide.
79 were record highs and 279 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 18 monthly and 713 daily.
Brockville set a daily record precipitation of 51.6 mm (2.0 in) on 18 September 1945.
Across 163 earlier years (1803 to 2026) the same calendar date averaged 419 records.

Record Map

732 stations

732 station records on 18 September 1945 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 September 1945: highest significance records shown on the map
Station	Country	Type	Value	Significance
Brockville	Canada	Record daily precipitation	51.6 mm (2.0 in)	61 of 100 (Major)
Angelica	United States	Record daily precipitation	52.3 mm (2.1 in)	59 of 100 (Notable)
Penn Yan	United States	Record daily precipitation	64.8 mm (2.6 in)	58 of 100 (Notable)
Ottawa Cda	Canada	Record daily precipitation	60.5 mm (2.4 in)	57 of 100 (Notable)
Lindsay	Canada	Record daily precipitation	61.2 mm (2.4 in)	57 of 100 (Notable)
Harpers Ferry River	United States	Record daily precipitation	96.3 mm (3.8 in)	57 of 100 (Notable)
Clontarf	Canada	Record daily precipitation	48.8 mm (1.9 in)	56 of 100 (Notable)
Lawrenceville 2 S	United States	Record daily precipitation	53.3 mm (2.1 in)	55 of 100 (Notable)
Coonamble (Nardoo)	Australia	Record daily precipitation	85.1 mm (3.4 in)	54 of 100 (Notable)
Georgetown	Canada	Record daily precipitation	45.7 mm (1.8 in)	54 of 100 (Notable)
Watertown	United States	Record daily precipitation	62.7 mm (2.5 in)	54 of 100 (Notable)
Lennoxville	Canada	Record daily precipitation	60.7 mm (2.4 in)	53 of 100 (Notable)
Woodstock 2 NE	United States	Record daily precipitation	68.6 mm (2.7 in)	53 of 100 (Notable)
Weston	United States	Record daily precipitation	46.2 mm (1.8 in)	52 of 100 (Notable)
Gronbaek-Allingskovgard	Denmark	Record daily precipitation	33.2 mm (1.3 in)	51 of 100 (Notable)
Hancock	United States	Record daily precipitation	77.7 mm (3.1 in)	51 of 100 (Notable)
Geneva Exp STN	United States	Record daily precipitation	51.1 mm (2.0 in)	51 of 100 (Notable)
Mt Wx	United States	Record daily precipitation	91.4 mm (3.6 in)	51 of 100 (Notable)
Pembroke Eddy Match	Canada	Record daily precipitation	45.0 mm (1.8 in)	50 of 100 (Notable)
Toronto	Canada	Record daily precipitation	52.6 mm (2.1 in)	50 of 100 (Notable)
Lake Megantic	Canada	Record daily precipitation	51.8 mm (2.0 in)	50 of 100 (Notable)
Hemlock	United States	Record daily precipitation	69.3 mm (2.7 in)	50 of 100 (Notable)
Huntingdon	United States	Record daily precipitation	69.3 mm (2.7 in)	50 of 100 (Notable)
Disraeli	Canada	Record daily precipitation	55.6 mm (2.2 in)	49 of 100 (Notable)
Avon	United States	Record daily precipitation	67.6 mm (2.7 in)	49 of 100 (Notable)
Fredonia	United States	Record daily precipitation	65.0 mm (2.6 in)	49 of 100 (Notable)
Indiana	United States	Record daily precipitation	50.5 mm (2.0 in)	49 of 100 (Notable)
Sherbrooke	Canada	Record daily precipitation	65.0 mm (2.6 in)	48 of 100 (Notable)
Jamestown	United States	Record daily precipitation	57.7 mm (2.3 in)	48 of 100 (Notable)
Graham 2 ENE	United States	Record daily precipitation	112.8 mm (4.4 in)	48 of 100 (Notable)
Reidsville	United States	Record daily precipitation	109.7 mm (4.3 in)	48 of 100 (Notable)
St Catharines	Canada	Record daily precipitation	61.7 mm (2.4 in)	47 of 100 (Notable)
Dehri	India	Record daily precipitation	125.7 mm (4.9 in)	47 of 100 (Notable)
Moorefield 1 SSE	United States	Record daily precipitation	65.3 mm (2.6 in)	47 of 100 (Notable)
Beauceville	Canada	Record daily precipitation	53.3 mm (2.1 in)	46 of 100 (Notable)
Les Cedres	Canada	Record daily precipitation	54.1 mm (2.1 in)	45 of 100 (Notable)
Staunton Wtp	United States	Record daily precipitation	110.5 mm (4.4 in)	45 of 100 (Notable)
Reading Wb City	United States	Record daily precipitation	74.9 mm (2.9 in)	45 of 100 (Notable)
Cheltenham 1 NW	United States	Record daily precipitation	72.9 mm (2.9 in)	44 of 100 (Notable)
Howard	United States	Record daily precipitation	48.3 mm (1.9 in)	44 of 100 (Notable)
Randolph 5 NNE	United States	Record daily precipitation	130.6 mm (5.1 in)	44 of 100 (Notable)
West Newton	United States	Record daily precipitation	50.8 mm (2.0 in)	43 of 100 (Notable)
Irwin	United States	Record daily precipitation	45.5 mm (1.8 in)	42 of 100 (Notable)
Richmond City Locks	United States	Record daily precipitation	60.5 mm (2.4 in)	42 of 100 (Notable)
Morrisburg	Canada	Record daily precipitation	46.5 mm (1.8 in)	41 of 100 (Notable)
Cumberland	United States	Record daily precipitation	60.5 mm (2.4 in)	41 of 100 (Notable)
Westminster 2 SSE	United States	Record daily precipitation	50.3 mm (2.0 in)	40 of 100 (Notable)
Lock Haven	United States	Record daily precipitation	43.4 mm (1.7 in)	40 of 100 (Notable)
Winchester 7 SE	United States	Record daily precipitation	75.7 mm (3.0 in)	40 of 100 (Notable)
Sorel	Canada	Record daily precipitation	33.0 mm (1.3 in)	39 of 100 (Notable)
Charleston 1	United States	Record daily precipitation	45.2 mm (1.8 in)	39 of 100 (Notable)
Belleville	Canada	Record low maximum temperature	10.6 C (51.1 F)	38 of 100 (Notable)
Durham	United States	Record daily precipitation	76.2 mm (3.0 in)	38 of 100 (Notable)
Towanda 1 S	United States	Record daily precipitation	51.3 mm (2.0 in)	38 of 100 (Notable)
Welland	Canada	Record daily precipitation	42.9 mm (1.7 in)	37 of 100 (Notable)
Huberdeau	Canada	Record daily precipitation	45.7 mm (1.8 in)	37 of 100 (Notable)
Moncure 3 SE	United States	Record daily precipitation	112.3 mm (4.4 in)	37 of 100 (Notable)
Altoona Horseshoe Curv	United States	Record daily precipitation	55.1 mm (2.2 in)	37 of 100 (Notable)
Bloserville 1 N	United States	Record daily precipitation	61.0 mm (2.4 in)	37 of 100 (Notable)
Onaka	United States	Record daily precipitation	31.8 mm (1.3 in)	37 of 100 (Notable)

Counts by Type and Timescale

732 records

Records set or tied on 18 September 1945 by type: Highest daily maximum 32, Lowest daily maximum 229, Highest daily minimum 47, Lowest daily minimum 50, Heaviest daily rainfall 367, Heaviest daily snowfall 7.

Records on 18 September 1945 by type
Record type	Records
Highest daily maximum	32
Lowest daily maximum	229
Highest daily minimum	47
Lowest daily minimum	50
Heaviest daily rainfall	367
Heaviest daily snowfall	7
Deepest snow cover	0

Records on 18 September 1945 by timescale: all-time 1, monthly 18, daily 713.

How Much Records Were Beaten By

651 broken records

Margins by which the 651 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 118.4. Ties are not counted.

Top 20 by Significance

18 September 1945

Top 20 records on 18 September 1945 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 September 1945	Brockville, CA	daily rain	51.6 mm (2.0 in)	38.6 mm (1.5 in)	58 years	61 of 100 (Major)
18 September 1945	Angelica, US	daily rain	52.3 mm (2.1 in)	37.1 mm (1.5 in)	49 years	59 of 100 (Notable)
18 September 1945	Penn Yan, US	daily rain	64.8 mm (2.6 in)	57.4 mm (2.3 in)	46 years	58 of 100 (Notable)
18 September 1945	Ottawa Cda, CA	daily rain	60.5 mm (2.4 in)	35.6 mm (1.4 in)	40 years	57 of 100 (Notable)
18 September 1945	Lindsay, CA	daily rain	61.2 mm (2.4 in)	38.3 mm (1.5 in)	40 years	57 of 100 (Notable)
18 September 1945	Harpers Ferry River, US	daily rain	96.3 mm (3.8 in)	68.4 mm (2.7 in)	40 years	57 of 100 (Notable)
18 September 1945	Clontarf, CA	daily rain	48.8 mm (1.9 in)	34.3 mm (1.4 in)	62 years	56 of 100 (Notable)
18 September 1945	Lawrenceville 2 S, US	daily rain	53.3 mm (2.1 in)	38.1 mm (1.5 in)	38 years	55 of 100 (Notable)
18 September 1945	Coonamble (Nardoo), AU	monthly rain	85.1 mm (3.4 in)	24.6 mm (1.0 in)	42 years	54 of 100 (Notable)
18 September 1945	Georgetown, CA	daily rain	45.7 mm (1.8 in)	27.2 mm (1.1 in)	40 years	54 of 100 (Notable)
18 September 1945	Watertown, US	daily rain	62.7 mm (2.5 in)	44.9 mm (1.8 in)	32 years	54 of 100 (Notable)
18 September 1945	Lennoxville, CA	daily rain	60.7 mm (2.4 in)	49.8 mm (2.0 in)	27 years	53 of 100 (Notable)
18 September 1945	Woodstock 2 NE, US	daily rain	68.6 mm (2.7 in)	43.7 mm (1.7 in)	27 years	53 of 100 (Notable)
18 September 1945	Weston, US	daily rain	46.2 mm (1.8 in)	36.0 mm (1.4 in)	50 years	52 of 100 (Notable)
18 September 1945	Gronbaek-Allingskovgard, DK	daily rain	33.2 mm (1.3 in)	18.4 mm (0.7 in)	55 years	51 of 100 (Notable)
18 September 1945	Hancock, US	daily rain	77.7 mm (3.1 in)	42.1 mm (1.7 in)	49 years	51 of 100 (Notable)
18 September 1945	Geneva Exp STN, US	daily rain	51.1 mm (2.0 in)	38.4 mm (1.5 in)	20 years	51 of 100 (Notable)
18 September 1945	Mt Wx, US	daily rain	91.4 mm (3.6 in)	79.7 mm (3.1 in)	27 years	51 of 100 (Notable)
18 September 1945	Pembroke Eddy Match, CA	daily rain	45.0 mm (1.8 in)	32.3 mm (1.3 in)	62 years	50 of 100 (Notable)
18 September 1945	Toronto, CA	daily rain	52.6 mm (2.1 in)	20.8 mm (0.8 in)	68 years	50 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 1945

Records set or tied on this calendar date in each year from 1803 to 1945. 1945 had 732 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 1945-09-18: 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 2026-10-15. Last revised 15 October 2026 (2026-10-15).

Margin	Records
0 to 20	529
20 to 40	86
40 to 60	24
60 to 80	7
80 to 100	4
100 to 120	1