Weather Records on 20 April 1971

765 weather records were set or tied worldwide on 20 April 1971. Highest significance: Hopewell 1 SE, US.

Key Facts for 20 April 1971

On 20 April 1971, 765 weather records were set or tied at long-record stations worldwide.
300 were record highs and 143 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 24 monthly and 741 daily.
Hopewell 1 SE set a daily record precipitation of 65.0 mm (2.6 in) on 20 April 1971.
Across 159 earlier years (1807 to 2026) the same calendar date averaged 460 records.

Record Map

765 stations

765 station records on 20 April 1971 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 April 1971: highest significance records shown on the map
Station	Country	Type	Value	Significance
Hopewell 1 SE	United States	Record daily precipitation	65.0 mm (2.6 in)	63 of 100 (Major)
Lakeview 2 NNW	United States	Record daily snowfall	25.4 cm (10.0 in)	62 of 100 (Major)
Chasm Falls	United States	Record snow depth	78.7 cm (31.0 in)	55 of 100 (Notable)
Rochelle 7ENE	United States	Record daily precipitation	41.4 mm (1.6 in)	55 of 100 (Notable)
Chama	United States	Record daily snowfall	26.7 cm (10.5 in)	52 of 100 (Notable)
Ogallala	United States	Record daily precipitation	83.8 mm (3.3 in)	51 of 100 (Notable)
Hettinger	United States	Record daily precipitation	42.2 mm (1.7 in)	51 of 100 (Notable)
Grand Lake 1 NW	United States	Record daily snowfall	40.6 cm (16.0 in)	50 of 100 (Notable)
Grand Lake 1 NW	United States	Record daily precipitation	32.8 mm (1.3 in)	48 of 100 (Notable)
Steamboat Springs	United States	Record daily snowfall	31.8 cm (12.5 in)	48 of 100 (Notable)
Lemmon	United States	Record daily precipitation	36.8 mm (1.4 in)	48 of 100 (Notable)
Timber Lake	United States	Record daily precipitation	40.9 mm (1.6 in)	46 of 100 (Notable)
Poronajsk	Russia	Record daily precipitation	27.8 mm (1.1 in)	45 of 100 (Notable)
Bird City 10S	United States	Record daily precipitation	57.7 mm (2.3 in)	45 of 100 (Notable)
Nuuanu Rsch 5 775	United States	Record daily precipitation	59.7 mm (2.4 in)	45 of 100 (Notable)
Benkelman 1N	United States	Record daily precipitation	45.2 mm (1.8 in)	44 of 100 (Notable)
Ashland	United States	Record daily snowfall	5.1 cm (2.0 in)	44 of 100 (Notable)
Wauneta	United States	Record daily precipitation	39.4 mm (1.6 in)	43 of 100 (Notable)
Shoshone	United States	Record daily precipitation	28.2 mm (1.1 in)	42 of 100 (Notable)
Mott	United States	Record daily precipitation	33.0 mm (1.3 in)	42 of 100 (Notable)
Valentine Nwr	United States	Record daily precipitation	54.4 mm (2.1 in)	41 of 100 (Notable)
Dulce	United States	Record daily snowfall	15.2 cm (6.0 in)	41 of 100 (Notable)
Forestburg 4 NNE	United States	Record daily precipitation	41.9 mm (1.6 in)	41 of 100 (Notable)
Petersburg 1	United States	Record daily snowfall	10.2 cm (4.0 in)	41 of 100 (Notable)
Steamboat Springs	United States	Record daily precipitation	38.1 mm (1.5 in)	40 of 100 (Notable)
Faith	United States	Record daily precipitation	32.0 mm (1.3 in)	40 of 100 (Notable)
Wallace 2W	United States	Record daily precipitation	45.0 mm (1.8 in)	39 of 100 (Notable)
Ketchikan AP	United States	Record low maximum temperature	1.7 C (35.1 F)	38 of 100 (Notable)
Nindigully	Australia	Record daily precipitation	33.0 mm (1.3 in)	37 of 100 (Notable)
Dupree	United States	Record daily precipitation	35.1 mm (1.4 in)	37 of 100 (Notable)
Longvalley	United States	Record daily precipitation	48.5 mm (1.9 in)	37 of 100 (Notable)
Salem 5 SW	United States	Record daily precipitation	45.7 mm (1.8 in)	37 of 100 (Notable)
Jonkoping	Sweden	Record high minimum temperature	6.8 C (44.2 F)	36 of 100 (Notable)
Waimea 892	United States	Record daily precipitation	33.3 mm (1.3 in)	36 of 100 (Notable)
Villaflores (Smn)	Mexico	Record low minimum temperature	7.8 C (46.0 F)	35 of 100 (Notable)
Purdum	United States	Record daily precipitation	49.5 mm (1.9 in)	35 of 100 (Notable)
Lakeview 2 NNW	United States	Record snow depth	25.4 cm (10.0 in)	35 of 100 (Notable)
Kadoka	United States	Record daily precipitation	38.1 mm (1.5 in)	35 of 100 (Notable)
Pyramid	United States	Record daily precipitation	29.5 mm (1.2 in)	34 of 100 (Routine)
Walden	United States	Record daily snowfall	25.4 cm (10.0 in)	34 of 100 (Routine)
Newton	United States	Record high maximum temperature	27.8 C (82.0 F)	34 of 100 (Routine)
Merriman	United States	Record daily precipitation	43.2 mm (1.7 in)	34 of 100 (Routine)
Mobridge 2NNW	United States	Record daily precipitation	57.2 mm (2.3 in)	34 of 100 (Routine)
Murdo	United States	Record daily precipitation	63.0 mm (2.5 in)	34 of 100 (Routine)
Tomazina	Brazil	Record daily precipitation	66.4 mm (2.6 in)	33 of 100 (Routine)
Anna 4 N	United States	Record high maximum temperature	31.7 C (89.1 F)	33 of 100 (Routine)
Morris W Cntrl Rsch & Outreach	United States	Record high minimum temperature	11.1 C (52.0 F)	33 of 100 (Routine)
Ft Meade	United States	Record daily precipitation	27.7 mm (1.1 in)	33 of 100 (Routine)
Mc Intosh 6 SE	United States	Record daily precipitation	46.2 mm (1.8 in)	33 of 100 (Routine)
Midland	United States	Record daily precipitation	35.3 mm (1.4 in)	33 of 100 (Routine)
Aberdeen	United States	Record high minimum temperature	12.8 C (55.0 F)	33 of 100 (Routine)
Itapage	Brazil	Record daily precipitation	85.2 mm (3.4 in)	32 of 100 (Routine)
Prattville	United States	Record high maximum temperature	31.7 C (89.1 F)	32 of 100 (Routine)
Rico	United States	Record daily snowfall	17.8 cm (7.0 in)	32 of 100 (Routine)
Chacon	United States	Record daily snowfall	7.6 cm (3.0 in)	32 of 100 (Routine)
Waipahu 750	United States	Record daily precipitation	26.9 mm (1.1 in)	32 of 100 (Routine)
Boqueirao	Brazil	Record daily precipitation	64.6 mm (2.5 in)	31 of 100 (Routine)
Pedro Leopoldo	Brazil	Record daily precipitation	30.0 mm (1.2 in)	31 of 100 (Routine)
Luverne	United States	Record high maximum temperature	28.3 C (82.9 F)	31 of 100 (Routine)
Milesville 5 NE	United States	Record daily precipitation	33.5 mm (1.3 in)	31 of 100 (Routine)

Counts by Type and Timescale

765 records

Records set or tied on 20 April 1971 by type: Highest daily maximum 169, Lowest daily maximum 72, Highest daily minimum 131, Lowest daily minimum 71, Heaviest daily rainfall 273, Heaviest daily snowfall 36, Deepest snow cover 13.

Records on 20 April 1971 by type
Record type	Records
Highest daily maximum	169
Lowest daily maximum	72
Highest daily minimum	131
Lowest daily minimum	71
Heaviest daily rainfall	273
Heaviest daily snowfall	36
Deepest snow cover	13

Records on 20 April 1971 by timescale: all-time 0, monthly 24, daily 741.

How Much Records Were Beaten By

621 broken records

Margins by which the 621 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 609.0. Ties are not counted.

Top 20 by Significance

20 April 1971

Top 20 records on 20 April 1971 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 April 1971	Hopewell 1 SE, US	daily rain	65.0 mm (2.6 in)	45.9 mm (1.8 in)	57 years	63 of 100 (Major)
20 April 1971	Lakeview 2 NNW, US	monthly snowfall	25.4 cm (10.0 in)	8.9 cm (3.5 in)	66 years	62 of 100 (Major)
20 April 1971	Chasm Falls, US	daily snow depth	78.7 cm (31.0 in)	60.9 cm (24.0 in)	38 years	55 of 100 (Notable)
20 April 1971	Rochelle 7ENE, US	daily rain	41.4 mm (1.6 in)	35.3 mm (1.4 in)	37 years	55 of 100 (Notable)
20 April 1971	Chama, US	daily snowfall	26.7 cm (10.5 in)	14.0 cm (5.5 in)	64 years	52 of 100 (Notable)
20 April 1971	Ogallala, US	monthly rain	83.8 mm (3.3 in)	17.8 mm (0.7 in)	56 years	51 of 100 (Notable)
20 April 1971	Hettinger, US	daily rain	42.2 mm (1.7 in)	33.3 mm (1.3 in)	16 years	51 of 100 (Notable)
20 April 1971	Grand Lake 1 NW, US	daily snowfall	40.6 cm (16.0 in)	27.9 cm (11.0 in)	58 years	50 of 100 (Notable)
20 April 1971	Grand Lake 1 NW, US	daily rain	32.8 mm (1.3 in)	25.7 mm (1.0 in)	9 years	48 of 100 (Notable)
20 April 1971	Steamboat Springs, US	monthly snowfall	31.8 cm (12.5 in)	3.9 cm (1.5 in)	77 years	48 of 100 (Notable)
20 April 1971	Lemmon, US	daily rain	36.8 mm (1.4 in)	24.1 mm (0.9 in)	13 years	48 of 100 (Notable)
20 April 1971	Timber Lake, US	daily rain	40.9 mm (1.6 in)	19.3 mm (0.8 in)	57 years	46 of 100 (Notable)
20 April 1971	Poronajsk, RU	daily rain	27.8 mm (1.1 in)	13.6 mm (0.5 in)	54 years	45 of 100 (Notable)
20 April 1971	Bird City 10S, US	daily rain	57.7 mm (2.3 in)	36.1 mm (1.4 in)	2 years	45 of 100 (Notable)
20 April 1971	Nuuanu Rsch 5 775, US	daily rain	59.7 mm (2.4 in)	40.4 mm (1.6 in)	14 years	45 of 100 (Notable)
20 April 1971	Benkelman 1N, US	daily rain	45.2 mm (1.8 in)	23.9 mm (0.9 in)	41 years	44 of 100 (Notable)
20 April 1971	Ashland, US	daily snowfall	5.1 cm (2.0 in)	5.1 cm (2.0 in)	77 years	44 of 100 (Notable)
20 April 1971	Wauneta, US	daily rain	39.4 mm (1.6 in)	17.8 mm (0.7 in)	65 years	43 of 100 (Notable)
20 April 1971	Shoshone, US	daily rain	28.2 mm (1.1 in)	16.0 mm (0.6 in)	21 years	42 of 100 (Notable)
20 April 1971	Mott, US	daily rain	33.0 mm (1.3 in)	19.0 mm (0.7 in)	13 years	42 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 1971

Records set or tied on this calendar date in each year from 1807 to 1971. 1971 had 765 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 1971-04-20: 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 100	609
100 to 200	7
200 to 300	4
300 to 400	0
400 to 500	0
500 to 600	0
600 to 700	1