Weather Records on 20 April 2011

1,477 weather records were set or tied worldwide on 20 April 2011. Highest significance: Appleton, US.

Key Facts for 20 April 2011

On 20 April 2011, 1,477 weather records were set or tied at long-record stations worldwide.
664 were record highs and 347 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 60 monthly and 1,416 daily.
Appleton set a daily record snowfall of 23.9 cm (9.4 in) on 20 April 2011.
Across 159 earlier years (1807 to 2026) the same calendar date averaged 456 records.

Record Map

1,477 stations

1,477 station records on 20 April 2011 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 April 2011: highest significance records shown on the map
Station	Country	Type	Value	Significance
Appleton	United States	Record daily snowfall	23.9 cm (9.4 in)	80 of 100 (Exceptional)
Green Bay	United States	Record snow depth	22.9 cm (9.0 in)	78 of 100 (Major)
Onaka	United States	Record daily snowfall	25.4 cm (10.0 in)	68 of 100 (Major)
Cresco 1 NE	United States	Record snow depth	12.7 cm (5.0 in)	66 of 100 (Major)
Reedsburg Wwtp	United States	Record daily snowfall	12.2 cm (4.8 in)	65 of 100 (Major)
Oakland 1 SE	United States	Record daily precipitation	41.9 mm (1.6 in)	64 of 100 (Major)
New London	United States	Record snow depth	17.8 cm (7.0 in)	64 of 100 (Major)
Terre Haute Indiana State	United States	Record daily precipitation	69.9 mm (2.8 in)	58 of 100 (Notable)
Rison	United States	Record daily precipitation	72.4 mm (2.9 in)	57 of 100 (Notable)
Brookville	United States	Record daily precipitation	61.5 mm (2.4 in)	57 of 100 (Notable)
Houghton Lake 6 WSW	United States	Record daily snowfall	10.2 cm (4.0 in)	57 of 100 (Notable)
Maple City 1E	United States	Record snow depth	20.3 cm (8.0 in)	57 of 100 (Notable)
Hancock Exp Farm	United States	Record snow depth	10.2 cm (4.0 in)	56 of 100 (Notable)
Britt 3E	United States	Record snow depth	10.2 cm (4.0 in)	55 of 100 (Notable)
Lake City Exp Farm	United States	Record snow depth	12.7 cm (5.0 in)	55 of 100 (Notable)
Sparta	United States	Record snow depth	15.2 cm (6.0 in)	55 of 100 (Notable)
Wisconsin Dells Wwtp	United States	Record daily snowfall	10.2 cm (4.0 in)	55 of 100 (Notable)
Oshkosh	United States	Record daily snowfall	11.7 cm (4.6 in)	54 of 100 (Notable)
Oshkosh	United States	Record snow depth	12.7 cm (5.0 in)	53 of 100 (Notable)
Reedsburg Wwtp	United States	Record snow depth	12.7 cm (5.0 in)	53 of 100 (Notable)
Paris Stp	United States	Record daily precipitation	67.6 mm (2.7 in)	52 of 100 (Notable)
New Castle 3 SW	United States	Record daily precipitation	86.4 mm (3.4 in)	52 of 100 (Notable)
Lake City Exp Farm	United States	Record daily snowfall	12.7 cm (5.0 in)	52 of 100 (Notable)
Weston	United States	Record daily precipitation	38.1 mm (1.5 in)	52 of 100 (Notable)
Mather 3 NW	United States	Record snow depth	15.2 cm (6.0 in)	52 of 100 (Notable)
Westby 3ENE	United States	Record daily snowfall	13.0 cm (5.1 in)	52 of 100 (Notable)
Mansfield 4 NW	United States	Record high minimum temperature	21.7 C (71.1 F)	51 of 100 (Notable)
Hart 3 WSW	United States	Record daily snowfall	5.1 cm (2.0 in)	51 of 100 (Notable)
Eaton	United States	Record daily precipitation	68.1 mm (2.7 in)	51 of 100 (Notable)
Waukon 3NNE	United States	Record snow depth	10.2 cm (4.0 in)	50 of 100 (Notable)
Crockett	United States	Record high maximum temperature	35.6 C (96.1 F)	50 of 100 (Notable)
Lancaster 4 WSW	United States	Record daily snowfall	5.1 cm (2.0 in)	50 of 100 (Notable)
Rosholt	United States	Record daily snowfall	10.2 cm (4.0 in)	50 of 100 (Notable)
Stevens Pt	United States	Record daily snowfall	10.2 cm (4.0 in)	50 of 100 (Notable)
Cresco 1 NE	United States	Record daily snowfall	14.0 cm (5.5 in)	49 of 100 (Notable)
Cheboygan	United States	Record daily snowfall	10.2 cm (4.0 in)	49 of 100 (Notable)
Ipswich	United States	Record daily snowfall	5.1 cm (2.0 in)	49 of 100 (Notable)
Greencastle 1 W	United States	Record daily precipitation	88.9 mm (3.5 in)	48 of 100 (Notable)
Lupton 1S	United States	Record daily snowfall	10.2 cm (4.0 in)	48 of 100 (Notable)
Mellette 4 W	United States	Record snow depth	25.4 cm (10.0 in)	48 of 100 (Notable)
Mather 3 NW	United States	Record daily snowfall	21.6 cm (8.5 in)	48 of 100 (Notable)
Wisconsin Rapids	United States	Record snow depth	12.7 cm (5.0 in)	48 of 100 (Notable)
Caledonia	United States	Record snow depth	15.2 cm (6.0 in)	47 of 100 (Notable)
Napoleon	United States	Record snow depth	10.2 cm (4.0 in)	47 of 100 (Notable)
Clarksburg 1	United States	Record daily precipitation	47.0 mm (1.9 in)	47 of 100 (Notable)
Erzurum	Turkey	Record daily precipitation	34.8 mm (1.4 in)	46 of 100 (Notable)
Dayton Mcd	United States	Record daily precipitation	56.6 mm (2.2 in)	46 of 100 (Notable)
Wisconsin Rapids	United States	Record daily snowfall	12.7 cm (5.0 in)	46 of 100 (Notable)
Wis Rapids Grand Av B	United States	Record snow depth	15.2 cm (6.0 in)	46 of 100 (Notable)
Wisley	United Kingdom	Record high maximum temperature	25.7 C (78.3 F)	45 of 100 (Notable)
Allison	United States	Record daily snowfall	7.6 cm (3.0 in)	45 of 100 (Notable)
Old Forge	United States	Record daily precipitation	31.8 mm (1.3 in)	45 of 100 (Notable)
Trempealeau Dam 6	United States	Record daily snowfall	10.2 cm (4.0 in)	45 of 100 (Notable)
Alpena Wwtp	United States	Record daily snowfall	10.2 cm (4.0 in)	45 of 100 (Notable)
Grand Meadow	United States	Record snow depth	10.2 cm (4.0 in)	44 of 100 (Notable)
Urbana Wrf	United States	Record daily precipitation	34.5 mm (1.4 in)	44 of 100 (Notable)
W Union 2	United States	Record daily precipitation	53.8 mm (2.1 in)	44 of 100 (Notable)
Eumundi - Crescent Rd	Australia	Record daily precipitation	50.0 mm (2.0 in)	43 of 100 (Notable)
Esengyly	Turkmenistan	Record high maximum temperature	40.0 C (104.0 F)	43 of 100 (Notable)
Shelbyville Dam	United States	Record daily precipitation	46.2 mm (1.8 in)	43 of 100 (Notable)

Counts by Type and Timescale

1,477 records

Records set or tied on 20 April 2011 by type: Highest daily maximum 309, Lowest daily maximum 242, Highest daily minimum 355, Lowest daily minimum 105, Heaviest daily rainfall 205, Heaviest daily snowfall 144, Deepest snow cover 117.

Records on 20 April 2011 by type
Record type	Records
Highest daily maximum	309
Lowest daily maximum	242
Highest daily minimum	355
Lowest daily minimum	105
Heaviest daily rainfall	205
Heaviest daily snowfall	144
Deepest snow cover	117

Records on 20 April 2011 by timescale: all-time 1, monthly 60, daily 1,416.

How Much Records Were Beaten By

1,137 broken records

Margins by which the 1,137 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 229.0. Ties are not counted.

Top 20 by Significance

20 April 2011

Top 20 records on 20 April 2011 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 April 2011	Appleton, US	daily snowfall	23.9 cm (9.4 in)	18.8 cm (7.4 in)	117 years	80 of 100 (Exceptional)
20 April 2011	Green Bay, US	daily snow depth	22.9 cm (9.0 in)	17.8 cm (7.0 in)	117 years	78 of 100 (Major)
20 April 2011	Onaka, US	daily snowfall	25.4 cm (10.0 in)	22.9 cm (9.0 in)	84 years	68 of 100 (Major)
20 April 2011	Cresco 1 NE, US	daily snow depth	12.7 cm (5.0 in)	12.7 cm (5.0 in)	66 years	66 of 100 (Major)
20 April 2011	Reedsburg Wwtp, US	daily snowfall	12.2 cm (4.8 in)	12.2 cm (4.8 in)	116 years	65 of 100 (Major)
20 April 2011	Oakland 1 SE, US	daily rain	41.9 mm (1.6 in)	21.6 mm (0.9 in)	90 years	64 of 100 (Major)
20 April 2011	New London, US	daily snow depth	17.8 cm (7.0 in)	17.8 cm (7.0 in)	111 years	64 of 100 (Major)
20 April 2011	Terre Haute Indiana State, US	daily rain	69.9 mm (2.8 in)	40.7 mm (1.6 in)	46 years	58 of 100 (Notable)
20 April 2011	Rison, US	daily rain	72.4 mm (2.9 in)	42.4 mm (1.7 in)	92 years	57 of 100 (Notable)
20 April 2011	Brookville, US	daily rain	61.5 mm (2.4 in)	35.1 mm (1.4 in)	48 years	57 of 100 (Notable)
20 April 2011	Houghton Lake 6 WSW, US	daily snowfall	10.2 cm (4.0 in)	9.7 cm (3.8 in)	86 years	57 of 100 (Notable)
20 April 2011	Maple City 1E, US	daily snow depth	20.3 cm (8.0 in)	20.3 cm (8.0 in)	52 years	57 of 100 (Notable)
20 April 2011	Hancock Exp Farm, US	daily snow depth	10.2 cm (4.0 in)	10.2 cm (4.0 in)	90 years	56 of 100 (Notable)
20 April 2011	Britt 3E, US	daily snow depth	10.2 cm (4.0 in)	10.2 cm (4.0 in)	101 years	55 of 100 (Notable)
20 April 2011	Lake City Exp Farm, US	daily snow depth	12.7 cm (5.0 in)	12.7 cm (5.0 in)	110 years	55 of 100 (Notable)
20 April 2011	Sparta, US	daily snow depth	15.2 cm (6.0 in)	15.2 cm (6.0 in)	61 years	55 of 100 (Notable)
20 April 2011	Wisconsin Dells Wwtp, US	daily snowfall	10.2 cm (4.0 in)	10.2 cm (4.0 in)	88 years	55 of 100 (Notable)
20 April 2011	Oshkosh, US	daily snowfall	11.7 cm (4.6 in)	9.2 cm (3.6 in)	86 years	54 of 100 (Notable)
20 April 2011	Oshkosh, US	daily snow depth	12.7 cm (5.0 in)	12.7 cm (5.0 in)	60 years	53 of 100 (Notable)
20 April 2011	Reedsburg Wwtp, US	daily snow depth	12.7 cm (5.0 in)	12.7 cm (5.0 in)	96 years	53 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 2011

Records set or tied on this calendar date in each year from 1807 to 2011. 2011 had 1,477 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 2011-04-20: 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 2026-10-16. Last revised 16 October 2026 (2026-10-16).

Margin	Records
0 to 50	1,020
50 to 100	68
100 to 150	36
150 to 200	10
200 to 250	3