Weather Records on 18 April 1940

322 weather records were set or tied worldwide on 18 April 1940. Highest significance: Anticosti SW Point, CA.

Key Facts for 18 April 1940

On 18 April 1940, 322 weather records were set or tied at long-record stations worldwide.
54 were record highs and 77 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 4 monthly and 318 daily.
Anticosti SW Point set a daily record precipitation of 39.4 mm (1.6 in) on 18 April 1940.
Across 160 earlier years (1793 to 2026) the same calendar date averaged 468 records.

Record Map

322 stations

322 station records on 18 April 1940 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 April 1940: highest significance records shown on the map
Station	Country	Type	Value	Significance
Anticosti SW Point	Canada	Record daily precipitation	39.4 mm (1.6 in)	62 of 100 (Major)
Hopkinsville	United States	Record daily precipitation	81.8 mm (3.2 in)	55 of 100 (Notable)
Ashwood	United States	Record daily precipitation	95.3 mm (3.8 in)	54 of 100 (Notable)
Machadodorp	South Africa	Record daily precipitation	47.0 mm (1.9 in)	51 of 100 (Notable)
Sidney 2 N	United States	Record daily precipitation	52.6 mm (2.1 in)	50 of 100 (Notable)
Worsham	United States	Record daily precipitation	48.3 mm (1.9 in)	42 of 100 (Notable)
Gloversville	United States	Record daily precipitation	47.8 mm (1.9 in)	41 of 100 (Notable)
Piqua	United States	Record daily precipitation	60.7 mm (2.4 in)	41 of 100 (Notable)
Golconda River	United States	Record daily precipitation	47.5 mm (1.9 in)	39 of 100 (Notable)
Franklin Sewage Plt	United States	Record daily precipitation	64.8 mm (2.6 in)	37 of 100 (Notable)
Haileybury	Canada	Record daily snowfall	17.5 cm (6.9 in)	35 of 100 (Notable)
Palmetto	United States	Record daily precipitation	53.3 mm (2.1 in)	35 of 100 (Notable)
Dindigul	India	Record daily precipitation	42.4 mm (1.7 in)	34 of 100 (Routine)
Dullstroom (Sar)	South Africa	Record daily precipitation	43.2 mm (1.7 in)	34 of 100 (Routine)
Little Falls City Rsch	United States	Record daily precipitation	29.2 mm (1.1 in)	34 of 100 (Routine)
Hancock Exp Farm	United States	Record daily snowfall	10.2 cm (4.0 in)	34 of 100 (Routine)
Wynne	United States	Record daily precipitation	58.4 mm (2.3 in)	33 of 100 (Routine)
Greenville	United States	Record daily precipitation	86.9 mm (3.4 in)	33 of 100 (Routine)
Cedar Hill 1	United States	Record daily precipitation	44.7 mm (1.8 in)	33 of 100 (Routine)
University	United States	Record daily precipitation	64.5 mm (2.5 in)	32 of 100 (Routine)
Greenfield Ctr	United States	Record daily precipitation	39.4 mm (1.6 in)	31 of 100 (Routine)
Grand River Lock	United States	Record daily snowfall	6.4 cm (2.5 in)	31 of 100 (Routine)
New Burnside	United States	Record daily precipitation	39.1 mm (1.5 in)	30 of 100 (Routine)
Menasha	United States	Record daily snowfall	7.6 cm (3.0 in)	30 of 100 (Routine)
St John Bethlehem Aca	United States	Record daily precipitation	32.8 mm (1.3 in)	29 of 100 (Routine)
Portage Wwtp	United States	Record snow depth	10.2 cm (4.0 in)	29 of 100 (Routine)
Booneville	United States	Record daily precipitation	119.9 mm (4.7 in)	28 of 100 (Routine)
Sonamarg &	India	Record daily precipitation	100.1 mm (3.9 in)	27 of 100 (Routine)
Byrdstown 1 W	United States	Record daily precipitation	26.4 mm (1.0 in)	27 of 100 (Routine)
Lynnville 4 SSW	United States	Record daily precipitation	92.2 mm (3.6 in)	27 of 100 (Routine)
Portage Wwtp	United States	Record daily snowfall	8.9 cm (3.5 in)	27 of 100 (Routine)
Grenada	United States	Record daily precipitation	66.5 mm (2.6 in)	26 of 100 (Routine)
Salisbury	United States	Record daily precipitation	25.9 mm (1.0 in)	26 of 100 (Routine)
Helena	United States	Record daily precipitation	39.4 mm (1.6 in)	25 of 100 (Routine)
Osceola	United States	Record daily precipitation	30.0 mm (1.2 in)	25 of 100 (Routine)
Leitchfield 2 N	United States	Record daily precipitation	35.6 mm (1.4 in)	25 of 100 (Routine)
Mather 3 NW	United States	Record daily snowfall	5.1 cm (2.0 in)	25 of 100 (Routine)
Barrage Temiscamingue	Canada	Record daily precipitation	26.7 mm (1.1 in)	24 of 100 (Routine)
Batesville	United States	Record daily precipitation	41.1 mm (1.6 in)	24 of 100 (Routine)
Dover 1 W	United States	Record daily precipitation	38.9 mm (1.5 in)	24 of 100 (Routine)
Lewisburg Exp STN	United States	Record daily precipitation	38.6 mm (1.5 in)	24 of 100 (Routine)
Portland	United States	Record daily precipitation	52.8 mm (2.1 in)	23 of 100 (Routine)
Coldwater	United States	Record daily precipitation	80.0 mm (3.1 in)	23 of 100 (Routine)
Anticosti SW Point	Canada	Record daily snowfall	39.4 cm (15.5 in)	22 of 100 (Routine)
Palmaryville	South Africa	Record daily precipitation	30.5 mm (1.2 in)	22 of 100 (Routine)
Trinidad	United States	Record low minimum temperature	-10.6 C (12.9 F)	22 of 100 (Routine)
Gayndah Post Office	Australia	Record low minimum temperature	5.0 C (41.0 F)	21 of 100 (Routine)
Surgut	Russia	Record high minimum temperature	4.7 C (40.5 F)	21 of 100 (Routine)
Emporia 1 S	United States	Record daily precipitation	28.2 mm (1.1 in)	21 of 100 (Routine)
Cheboygan	United States	Record daily snowfall	7.6 cm (3.0 in)	21 of 100 (Routine)
Murfreesboro 5 N	United States	Record daily precipitation	40.4 mm (1.6 in)	21 of 100 (Routine)
Waynesboro	United States	Record daily precipitation	78.0 mm (3.1 in)	21 of 100 (Routine)
Sheffield	United Kingdom	Record daily precipitation	23.1 mm (0.9 in)	20 of 100 (Routine)
Salekhard	Russia	Record daily precipitation	11.9 mm (0.5 in)	20 of 100 (Routine)
Nordby (Fano)	Denmark	Record daily precipitation	17.0 mm (0.7 in)	20 of 100 (Routine)
Hoorn	Netherlands	Record daily precipitation	13.4 mm (0.5 in)	20 of 100 (Routine)
Goldberg	Germany	Record daily precipitation	19.6 mm (0.8 in)	20 of 100 (Routine)
Port Lincoln (White Flat)	Australia	Record daily precipitation	13.2 mm (0.5 in)	20 of 100 (Routine)
Karad	India	Record daily precipitation	9.9 mm (0.39 in)	20 of 100 (Routine)
Wilcannia (Mena Murtee)	Australia	Record daily precipitation	1.3 mm (0.05 in)	20 of 100 (Routine)

Counts by Type and Timescale

322 records

Records set or tied on 18 April 1940 by type: Highest daily maximum 14, Lowest daily maximum 39, Highest daily minimum 40, Lowest daily minimum 38, Heaviest daily rainfall 173, Heaviest daily snowfall 17, Deepest snow cover 1.

Records on 18 April 1940 by type
Record type	Records
Highest daily maximum	14
Lowest daily maximum	39
Highest daily minimum	40
Lowest daily minimum	38
Heaviest daily rainfall	173
Heaviest daily snowfall	17
Deepest snow cover	1

Records on 18 April 1940 by timescale: all-time 0, monthly 4, daily 318.

How Much Records Were Beaten By

278 broken records

Margins by which the 278 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 102.0. Ties are not counted.

Top 20 by Significance

18 April 1940

Top 20 records on 18 April 1940 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 April 1940	Anticosti SW Point, CA	daily rain	39.4 mm (1.6 in)	30.5 mm (1.2 in)	64 years	62 of 100 (Major)
18 April 1940	Hopkinsville, US	daily rain	81.8 mm (3.2 in)	62.2 mm (2.4 in)	39 years	55 of 100 (Notable)
18 April 1940	Ashwood, US	daily rain	95.3 mm (3.8 in)	58.5 mm (2.3 in)	32 years	54 of 100 (Notable)
18 April 1940	Machadodorp, ZA	daily rain	47.0 mm (1.9 in)	41.9 mm (1.6 in)	27 years	51 of 100 (Notable)
18 April 1940	Sidney 2 N, US	daily rain	52.6 mm (2.1 in)	34.1 mm (1.3 in)	23 years	50 of 100 (Notable)
18 April 1940	Worsham, US	daily rain	48.3 mm (1.9 in)	38.9 mm (1.5 in)	32 years	42 of 100 (Notable)
18 April 1940	Gloversville, US	daily rain	47.8 mm (1.9 in)	24.9 mm (1.0 in)	30 years	41 of 100 (Notable)
18 April 1940	Piqua, US	daily rain	60.7 mm (2.4 in)	29.7 mm (1.2 in)	23 years	41 of 100 (Notable)
18 April 1940	Golconda River, US	daily rain	47.5 mm (1.9 in)	29.7 mm (1.2 in)	39 years	39 of 100 (Notable)
18 April 1940	Franklin Sewage Plt, US	daily rain	64.8 mm (2.6 in)	31.3 mm (1.2 in)	39 years	37 of 100 (Notable)
18 April 1940	Haileybury, CA	daily snowfall	17.5 cm (6.9 in)	8.4 cm (3.3 in)	39 years	35 of 100 (Notable)
18 April 1940	Palmetto, US	daily rain	53.3 mm (2.1 in)	27.9 mm (1.1 in)	39 years	35 of 100 (Notable)
18 April 1940	Dindigul, IN	daily rain	42.4 mm (1.7 in)	31.7 mm (1.2 in)	20 years	34 of 100 (Routine)
18 April 1940	Dullstroom (Sar), ZA	daily rain	43.2 mm (1.7 in)	32.8 mm (1.3 in)	9 years	34 of 100 (Routine)
18 April 1940	Little Falls City Rsch, US	daily rain	29.2 mm (1.1 in)	11.9 mm (0.5 in)	40 years	34 of 100 (Routine)
18 April 1940	Hancock Exp Farm, US	daily snowfall	10.2 cm (4.0 in)	10.2 cm (4.0 in)	37 years	34 of 100 (Routine)
18 April 1940	Wynne, US	daily rain	58.4 mm (2.3 in)	44.9 mm (1.8 in)	29 years	33 of 100 (Routine)
18 April 1940	Greenville, US	daily rain	86.9 mm (3.4 in)	64.0 mm (2.5 in)	2 years	33 of 100 (Routine)
18 April 1940	Cedar Hill 1, US	daily rain	44.7 mm (1.8 in)	34.5 mm (1.4 in)	10 years	33 of 100 (Routine)
18 April 1940	University, US	daily rain	64.5 mm (2.5 in)	37.1 mm (1.5 in)	29 years	32 of 100 (Routine)

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

1793 to 1940

Records set or tied on this calendar date in each year from 1793 to 1940. 1940 had 322 records.

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

Records on 04-18 in each year
Year	Records
1793	1
1807	2
1815	1
1838	1
1847	1
1849	1
1851	1
1852	3
1854	3
1855	1
1865	4
1867	1
1870	1
1871	1
1875	4
1877	2
1878	1
1879	3
1880	2
1884	2
1886	2
1887	3
1888	1
1889	1
1890	2
1891	1
1892	3
1893	5
1894	7
1895	2
1896	3
1897	5
1898	8
1899	2
1900	2
1901	6
1902	5
1903	11
1904	9
1905	12
1906	18
1907	17
1908	37
1909	19
1910	19
1911	25
1912	21
1913	26
1914	38
1915	31
1916	22
1917	40
1918	76
1919	16
1920	64
1921	58
1922	85
1923	107
1924	101
1925	154
1926	322
1927	391
1928	323
1929	126
1930	113
1931	173
1932	326
1933	211
1934	391
1935	264
1936	483
1937	477
1938	711
1939	525
1940	322
1941	496
1942	287
1943	298
1944	259
1945	371
1946	357
1947	444
1948	932
1949	345
1950	244
1951	658
1952	536
1953	1,322
1954	442
1955	817
1956	467
1957	629
1958	370
1959	468
1960	320
1961	520
1962	484
1963	662
1964	449
1965	363
1966	776
1967	882
1968	867
1969	795
1970	771
1971	1,106
1972	470
1973	953
1974	326
1975	751
1976	1,309
1977	717
1978	803
1979	841
1980	842
1981	708
1982	616
1983	2,082
1984	625
1985	1,119
1986	622
1987	1,068
1988	936
1989	625
1990	1,368
1991	780
1992	702
1993	730
1994	1,218
1995	1,601
1996	826
1997	1,256
1998	1,011
1999	1,428
2000	912
2001	1,487
2002	2,084
2003	969
2004	846
2005	622
2006	1,262
2007	675
2008	913
2009	624
2010	478
2011	1,122
2012	744
2013	2,509
2014	534
2015	519
2016	973
2017	588
2018	1,202
2019	601
2020	770
2021	592
2022	1,013
2023	739
2024	641
2025	997
2026	498

Download the Data

Data for records on 1940-04-18: 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	238
20 to 40	25
40 to 60	7
60 to 80	6
80 to 100	1
100 to 120	1