Weather Records on 20 April 1940

519 weather records were set or tied worldwide on 20 April 1940. Highest significance: Fort Macleod, CA.

Key Facts for 20 April 1940

On 20 April 1940, 519 weather records were set or tied at long-record stations worldwide.
91 were record highs and 100 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 12 monthly and 507 daily.
Fort Macleod set a daily record precipitation of 37.1 mm (1.5 in) on 20 April 1940.
Across 159 earlier years (1807 to 2026) the same calendar date averaged 462 records.

Record Map

519 stations

519 station records on 20 April 1940 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 April 1940: highest significance records shown on the map
Station	Country	Type	Value	Significance
Fort Macleod	Canada	Record daily precipitation	37.1 mm (1.5 in)	55 of 100 (Notable)
Edmonton	Canada	Record daily precipitation	34.8 mm (1.4 in)	52 of 100 (Notable)
Saltsburg	United States	Record daily precipitation	45.5 mm (1.8 in)	52 of 100 (Notable)
Laurel 3 W	United States	Record daily precipitation	61.2 mm (2.4 in)	50 of 100 (Notable)
Calgary Int'l A	Canada	Record daily precipitation	29.2 mm (1.1 in)	49 of 100 (Notable)
York 3 SSW Pump STN	United States	Record daily precipitation	66.5 mm (2.6 in)	46 of 100 (Notable)
Beckley Va Hospital	United States	Record daily precipitation	52.3 mm (2.1 in)	46 of 100 (Notable)
Parsons 3 SE	United States	Record daily precipitation	116.1 mm (4.6 in)	46 of 100 (Notable)
Baltimore Customs House	United States	Record daily precipitation	56.9 mm (2.2 in)	46 of 100 (Notable)
Selinsgrove 2 S	United States	Record daily precipitation	64.0 mm (2.5 in)	45 of 100 (Notable)
Acmetonia Lock 3	United States	Record daily precipitation	44.7 mm (1.8 in)	43 of 100 (Notable)
Washington	United States	Record daily precipitation	43.4 mm (1.7 in)	43 of 100 (Notable)
Greensburg	United States	Record daily precipitation	71.4 mm (2.8 in)	42 of 100 (Notable)
Mt Airy 2 W	United States	Record daily precipitation	78.5 mm (3.1 in)	42 of 100 (Notable)
Carlisle	United States	Record daily precipitation	54.4 mm (2.1 in)	41 of 100 (Notable)
Burnside	United States	Record daily precipitation	65.3 mm (2.6 in)	40 of 100 (Notable)
Woodstock	United States	Record daily precipitation	57.7 mm (2.3 in)	40 of 100 (Notable)
Gettysburg	United States	Record daily precipitation	55.9 mm (2.2 in)	40 of 100 (Notable)
Clarksville	United States	Record daily precipitation	50.8 mm (2.0 in)	39 of 100 (Notable)
Atlantic City Marina	United States	Record daily precipitation	43.4 mm (1.7 in)	39 of 100 (Notable)
College Park	United States	Record daily precipitation	49.3 mm (1.9 in)	37 of 100 (Notable)
Darlington	United States	Record daily precipitation	50.8 mm (2.0 in)	37 of 100 (Notable)
Parksville	United States	Record daily precipitation	46.7 mm (1.8 in)	37 of 100 (Notable)
Great Falls	United States	Record daily precipitation	39.6 mm (1.6 in)	35 of 100 (Notable)
Coraopolis Neville Is	United States	Record daily precipitation	38.1 mm (1.5 in)	35 of 100 (Notable)
Roebling	United States	Record daily precipitation	38.6 mm (1.5 in)	34 of 100 (Routine)
Hanover	United States	Record daily precipitation	58.2 mm (2.3 in)	34 of 100 (Routine)
State College	United States	Record daily precipitation	51.6 mm (2.0 in)	34 of 100 (Routine)
Blacksburg	United States	Record daily precipitation	43.2 mm (1.7 in)	34 of 100 (Routine)
Philadelphia Shawmont	United States	Record daily precipitation	48.3 mm (1.9 in)	33 of 100 (Routine)
Wetaskiwin	Canada	Record daily precipitation	25.4 mm (1.0 in)	32 of 100 (Routine)
Bucyrus	United States	Record daily precipitation	38.1 mm (1.5 in)	32 of 100 (Routine)
Wilkes Barre	United States	Record daily precipitation	36.1 mm (1.4 in)	32 of 100 (Routine)
Paoli	United States	Record daily precipitation	56.9 mm (2.2 in)	31 of 100 (Routine)
Fallston	United States	Record daily precipitation	62.2 mm (2.4 in)	31 of 100 (Routine)
Alfred	United States	Record daily snowfall	13.5 cm (5.3 in)	31 of 100 (Routine)
Asheville Pearson St	United States	Record daily precipitation	35.6 mm (1.4 in)	31 of 100 (Routine)
Lancaster 2 NE Pump St	United States	Record daily precipitation	43.2 mm (1.7 in)	31 of 100 (Routine)
Pottstown	United States	Record daily precipitation	33.3 mm (1.3 in)	31 of 100 (Routine)
Takoma Park # 1	United States	Record daily precipitation	38.6 mm (1.5 in)	30 of 100 (Routine)
Kingston	United States	Record daily precipitation	49.5 mm (1.9 in)	30 of 100 (Routine)
Carlton Brg	United States	Record daily precipitation	38.1 mm (1.5 in)	29 of 100 (Routine)
Greensboro	United States	Record daily precipitation	35.6 mm (1.4 in)	29 of 100 (Routine)
Coleman 3 WNW	United States	Record daily precipitation	52.1 mm (2.1 in)	29 of 100 (Routine)
Marion	United States	Record daily precipitation	45.7 mm (1.8 in)	29 of 100 (Routine)
Towanda 1 S	United States	Record daily precipitation	37.1 mm (1.5 in)	29 of 100 (Routine)
White Sulphur Springs	United States	Record daily precipitation	33.0 mm (1.3 in)	29 of 100 (Routine)
Richmond City Locks	United States	Record daily precipitation	56.1 mm (2.2 in)	28 of 100 (Routine)
Quipolly Creek Post Office	Australia	Record daily precipitation	34.8 mm (1.4 in)	27 of 100 (Routine)
Delaware Cy Reedy Poin	United States	Record daily precipitation	37.3 mm (1.5 in)	27 of 100 (Routine)
Dover	United States	Record daily precipitation	39.1 mm (1.5 in)	27 of 100 (Routine)
Williamsburg 2	United States	Record daily precipitation	56.9 mm (2.2 in)	27 of 100 (Routine)
Mohonk Lake	United States	Record daily precipitation	27.9 mm (1.1 in)	27 of 100 (Routine)
Chippewa Lake	United States	Record daily precipitation	45.7 mm (1.8 in)	27 of 100 (Routine)
Cincinnati Sus Brg	United States	Record daily precipitation	55.6 mm (2.2 in)	27 of 100 (Routine)
Centre Hall	United States	Record daily precipitation	35.6 mm (1.4 in)	27 of 100 (Routine)
Harrisburg - Coop	United States	Record daily precipitation	54.4 mm (2.1 in)	27 of 100 (Routine)
Lebanon 3 W	United States	Record daily precipitation	38.9 mm (1.5 in)	27 of 100 (Routine)
Quakertown	United States	Record daily precipitation	42.2 mm (1.7 in)	27 of 100 (Routine)
Randolph 5 NNE	United States	Record daily precipitation	29.0 mm (1.1 in)	27 of 100 (Routine)

Counts by Type and Timescale

519 records

Records set or tied on 20 April 1940 by type: Highest daily maximum 39, Lowest daily maximum 81, Highest daily minimum 52, Lowest daily minimum 19, Heaviest daily rainfall 319, Heaviest daily snowfall 9.

Records on 20 April 1940 by type
Record type	Records
Highest daily maximum	39
Lowest daily maximum	81
Highest daily minimum	52
Lowest daily minimum	19
Heaviest daily rainfall	319
Heaviest daily snowfall	9
Deepest snow cover	0

Records on 20 April 1940 by timescale: all-time 0, monthly 12, daily 507.

How Much Records Were Beaten By

447 broken records

Margins by which the 447 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 115.0. Ties are not counted.

Top 20 by Significance

20 April 1940

Top 20 records on 20 April 1940 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 April 1940	Fort Macleod, CA	daily rain	37.1 mm (1.5 in)	33.3 mm (1.3 in)	31 years	55 of 100 (Notable)
20 April 1940	Edmonton, CA	daily rain	34.8 mm (1.4 in)	28.7 mm (1.1 in)	20 years	52 of 100 (Notable)
20 April 1940	Saltsburg, US	daily rain	45.5 mm (1.8 in)	26.2 mm (1.0 in)	45 years	52 of 100 (Notable)
20 April 1940	Laurel 3 W, US	daily rain	61.2 mm (2.4 in)	48.5 mm (1.9 in)	31 years	50 of 100 (Notable)
20 April 1940	Calgary Int'l A, CA	daily rain	29.2 mm (1.1 in)	22.6 mm (0.9 in)	11 years	49 of 100 (Notable)
20 April 1940	York 3 SSW Pump STN, US	daily rain	66.5 mm (2.6 in)	44.9 mm (1.8 in)	7 years	46 of 100 (Notable)
20 April 1940	Beckley Va Hospital, US	daily rain	52.3 mm (2.1 in)	29.4 mm (1.2 in)	39 years	46 of 100 (Notable)
20 April 1940	Parsons 3 SE, US	monthly rain	116.1 mm (4.6 in)	37.9 mm (1.5 in)	15 years	46 of 100 (Notable)
20 April 1940	Baltimore Customs House, US	daily rain	56.9 mm (2.2 in)	30.7 mm (1.2 in)	46 years	46 of 100 (Notable)
20 April 1940	Selinsgrove 2 S, US	daily rain	64.0 mm (2.5 in)	34.3 mm (1.4 in)	26 years	45 of 100 (Notable)
20 April 1940	Acmetonia Lock 3, US	daily rain	44.7 mm (1.8 in)	26.7 mm (1.1 in)	7 years	43 of 100 (Notable)
20 April 1940	Washington, US	daily rain	43.4 mm (1.7 in)	12.4 mm (0.5 in)	82 years	43 of 100 (Notable)
20 April 1940	Greensburg, US	monthly rain	71.4 mm (2.8 in)	17.6 mm (0.7 in)	39 years	42 of 100 (Notable)
20 April 1940	Mt Airy 2 W, US	monthly rain	78.5 mm (3.1 in)	18.6 mm (0.7 in)	40 years	42 of 100 (Notable)
20 April 1940	Carlisle, US	daily rain	54.4 mm (2.1 in)	16.3 mm (0.6 in)	62 years	41 of 100 (Notable)
20 April 1940	Burnside, US	daily rain	65.3 mm (2.6 in)	37.4 mm (1.5 in)	12 years	40 of 100 (Notable)
20 April 1940	Woodstock, US	daily rain	57.7 mm (2.3 in)	27.2 mm (1.1 in)	46 years	40 of 100 (Notable)
20 April 1940	Gettysburg, US	daily rain	55.9 mm (2.2 in)	28.2 mm (1.1 in)	31 years	40 of 100 (Notable)
20 April 1940	Clarksville, US	daily rain	50.8 mm (2.0 in)	34.3 mm (1.4 in)	29 years	39 of 100 (Notable)
20 April 1940	Atlantic City Marina, US	daily rain	43.4 mm (1.7 in)	13.4 mm (0.5 in)	65 years	39 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

1807 to 1940

Records set or tied on this calendar date in each year from 1807 to 1940. 1940 had 519 records.

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

Records on 04-20 in each year
Year	Records
1807	3
1817	1
1838	1
1849	2
1851	1
1852	4
1854	1
1858	1
1860	1
1864	1
1865	3
1868	1
1869	1
1870	1
1872	1
1874	3
1875	4
1876	1
1878	2
1880	2
1881	2
1884	1
1885	1
1886	2
1889	1
1891	2
1892	1
1893	6
1894	8
1895	7
1896	3
1897	6
1898	1
1899	1
1901	8
1902	3
1903	14
1904	31
1905	9
1906	12
1907	18
1908	14
1909	22
1910	25
1911	18
1912	12
1913	19
1914	46
1915	45
1916	19
1917	33
1918	42
1919	17
1920	49
1921	27
1922	40
1923	157
1924	113
1925	169
1926	310
1927	442
1928	212
1929	182
1930	87
1931	255
1932	166
1933	279
1934	384
1935	384
1936	311
1937	427
1938	339
1939	158
1940	519
1941	558
1942	223
1943	670
1944	304
1945	391
1946	395
1947	308
1948	493
1949	477
1950	329
1951	690
1952	552
1953	1,071
1954	377
1955	623
1956	384
1957	730
1958	327
1959	563
1960	472
1961	1,078
1962	487
1963	595
1964	749
1965	724
1966	1,174
1967	864
1968	975
1969	382
1970	948
1971	765
1972	531
1973	982
1974	673
1975	344
1976	661
1977	693
1978	800
1979	495
1980	1,539
1981	706
1982	906
1983	1,844
1984	922
1985	1,140
1986	770
1987	1,447
1988	1,144
1989	1,187
1990	1,495
1991	1,075
1992	1,009
1993	772
1994	756
1995	1,351
1996	970
1997	833
1998	1,490
1999	674
2000	931
2001	752
2002	1,081
2003	758
2004	567
2005	707
2006	859
2007	582
2008	1,110
2009	845
2010	693
2011	1,477
2012	726
2013	1,520
2014	384
2015	702
2016	650
2017	734
2018	1,309
2019	1,019
2020	449
2021	1,215
2022	596
2023	828
2024	673
2025	836
2026	533

Download the Data

Data for records on 1940-04-20: 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	405
20 to 40	39
40 to 60	2
60 to 80	0
80 to 100	0
100 to 120	1