Weather Records on 20 April 1977

693 weather records were set or tied worldwide on 20 April 1977. Highest significance: Densmore 2N, US.

Key Facts for 20 April 1977

On 20 April 1977, 693 weather records were set or tied at long-record stations worldwide.
188 were record highs and 168 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 18 monthly and 675 daily.
Densmore 2N set a monthly record daily precipitation of 101.6 mm (4.0 in) on 20 April 1977.
Across 159 earlier years (1807 to 2026) the same calendar date averaged 461 records.

Record Map

693 stations

693 station records on 20 April 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 April 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Densmore 2N	United States	Record daily precipitation	101.6 mm (4.0 in)	61 of 100 (Major)
Grand Coteau	United States	Record daily precipitation	185.4 mm (7.3 in)	60 of 100 (Major)
Tuapse	Russia	Record daily precipitation	68.7 mm (2.7 in)	58 of 100 (Notable)
Hana 354	United States	Record daily precipitation	96.5 mm (3.8 in)	58 of 100 (Notable)
Jourdanton	United States	Record daily precipitation	69.9 mm (2.8 in)	56 of 100 (Notable)
Shamrock	United States	Record daily precipitation	87.6 mm (3.4 in)	56 of 100 (Notable)
Wakeeney	United States	Record daily precipitation	51.3 mm (2.0 in)	54 of 100 (Notable)
Plainville 4WNW	United States	Record daily precipitation	45.7 mm (1.8 in)	52 of 100 (Notable)
Jeddo 3S	United States	Record daily precipitation	159.5 mm (6.3 in)	51 of 100 (Notable)
Acatlan de Osorio (Smn)	Mexico	Record low maximum temperature	21.7 C (71.1 F)	50 of 100 (Notable)
Itaju	Brazil	Record daily precipitation	99.5 mm (3.9 in)	47 of 100 (Notable)
Sterling	United States	Record daily precipitation	35.1 mm (1.4 in)	45 of 100 (Notable)
Fleming	United States	Record daily snowfall	7.6 cm (3.0 in)	44 of 100 (Notable)
Lamoni	United States	Record daily precipitation	47.2 mm (1.9 in)	44 of 100 (Notable)
Emu Park Hill St	Australia	Record daily precipitation	47.0 mm (1.9 in)	42 of 100 (Notable)
Baependi	Brazil	Record daily precipitation	50.5 mm (2.0 in)	42 of 100 (Notable)
Guaratingueta	Brazil	Record daily precipitation	48.2 mm (1.9 in)	42 of 100 (Notable)
Quinter	United States	Record daily precipitation	47.0 mm (1.9 in)	42 of 100 (Notable)
Upland 2NE	United States	Record daily precipitation	70.4 mm (2.8 in)	42 of 100 (Notable)
Lodgepole	United States	Record daily precipitation	59.4 mm (2.3 in)	41 of 100 (Notable)
Flagler 1S	United States	Record daily precipitation	29.0 mm (1.1 in)	40 of 100 (Notable)
Toledo Blade	United States	Record high minimum temperature	16.7 C (62.1 F)	40 of 100 (Notable)
Luling	United States	Record daily precipitation	105.4 mm (4.1 in)	40 of 100 (Notable)
Morgantown Muni AP	United States	Record high minimum temperature	18.3 C (64.9 F)	40 of 100 (Notable)
Sao Jose Do Rio Preto	Brazil	Record daily precipitation	50.2 mm (2.0 in)	39 of 100 (Notable)
Palestina (Smn)	Mexico	Record daily precipitation	39.9 mm (1.6 in)	39 of 100 (Notable)
Houston William P Hobby AP	United States	Record daily precipitation	91.9 mm (3.6 in)	39 of 100 (Notable)
Tabl.Mtn Molteno Rsv	South Africa	Record daily precipitation	37.5 mm (1.5 in)	38 of 100 (Notable)
Crowley 2 NE	United States	Record daily precipitation	105.4 mm (4.1 in)	38 of 100 (Notable)
Big Springs	United States	Record daily precipitation	49.3 mm (1.9 in)	38 of 100 (Notable)
Saint Paul	United States	Record daily precipitation	57.2 mm (2.3 in)	38 of 100 (Notable)
Tres Piedras	United States	Record daily snowfall	6.4 cm (2.5 in)	38 of 100 (Notable)
Pinhalzinho	Brazil	Record daily precipitation	54.3 mm (2.1 in)	37 of 100 (Notable)
Konstantinovsk	Russia	Record daily precipitation	28.9 mm (1.1 in)	37 of 100 (Notable)
Phillipsburg 1 SSE	United States	Record daily precipitation	80.0 mm (3.1 in)	37 of 100 (Notable)
Kapalama 773	United States	Record daily precipitation	65.5 mm (2.6 in)	37 of 100 (Notable)
Zelinda	Brazil	Record daily precipitation	53.4 mm (2.1 in)	36 of 100 (Notable)
Barra Mansa	Brazil	Record daily precipitation	32.9 mm (1.3 in)	36 of 100 (Notable)
Smith Ctr	United States	Record daily precipitation	58.7 mm (2.3 in)	36 of 100 (Notable)
Naponee	United States	Record daily precipitation	57.2 mm (2.3 in)	36 of 100 (Notable)
Kentwood	United States	Record daily precipitation	114.3 mm (4.5 in)	35 of 100 (Notable)
Halaula 1110	United States	Record daily precipitation	47.0 mm (1.9 in)	35 of 100 (Notable)
Cravinhos	Brazil	Record daily precipitation	56.3 mm (2.2 in)	34 of 100 (Routine)
San Marcos	United States	Record daily precipitation	55.4 mm (2.2 in)	34 of 100 (Routine)
Naalehu 14	United States	Record daily precipitation	26.7 mm (1.1 in)	34 of 100 (Routine)
San Antonio Intl AP	United States	Record daily precipitation	52.8 mm (2.1 in)	34 of 100 (Routine)
Jardinopolis	Brazil	Record daily precipitation	82.5 mm (3.2 in)	33 of 100 (Routine)
Mistassini Post	Canada	Record high minimum temperature	3.3 C (37.9 F)	33 of 100 (Routine)
Huichapan	Mexico	Record low maximum temperature	17.8 C (64.0 F)	33 of 100 (Routine)
Bomnak	Russia	Record low maximum temperature	-6.6 C (20.1 F)	33 of 100 (Routine)
Farmland 5 NNW	United States	Record high minimum temperature	15.6 C (60.1 F)	33 of 100 (Routine)
Hammond	United States	Record daily precipitation	114.8 mm (4.5 in)	33 of 100 (Routine)
New Orleans D P S 3	United States	Record daily precipitation	66.3 mm (2.6 in)	33 of 100 (Routine)
Bethany	United States	Record high minimum temperature	16.7 C (62.1 F)	33 of 100 (Routine)
Warren 3 S	United States	Record high maximum temperature	28.3 C (82.9 F)	33 of 100 (Routine)
Smithville	United States	Record daily precipitation	92.7 mm (3.6 in)	33 of 100 (Routine)
Moreton Telegraph Station	Australia	Record daily precipitation	44.4 mm (1.7 in)	32 of 100 (Routine)
Ust-Maja	Russia	Record low maximum temperature	-12.8 C (9.0 F)	32 of 100 (Routine)
Table.Mtn Platteklip	South Africa	Record daily precipitation	37.2 mm (1.5 in)	32 of 100 (Routine)
Durbanville (Pol)	South Africa	Record daily precipitation	30.5 mm (1.2 in)	32 of 100 (Routine)

Counts by Type and Timescale

693 records

Records set or tied on 20 April 1977 by type: Highest daily maximum 69, Lowest daily maximum 107, Highest daily minimum 119, Lowest daily minimum 61, Heaviest daily rainfall 317, Heaviest daily snowfall 16, Deepest snow cover 4.

Records on 20 April 1977 by type
Record type	Records
Highest daily maximum	69
Lowest daily maximum	107
Highest daily minimum	119
Lowest daily minimum	61
Heaviest daily rainfall	317
Heaviest daily snowfall	16
Deepest snow cover	4

Records on 20 April 1977 by timescale: all-time 0, monthly 18, daily 675.

How Much Records Were Beaten By

577 broken records

Margins by which the 577 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 279.0. Ties are not counted.

Top 20 by Significance

20 April 1977

Top 20 records on 20 April 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 April 1977	Densmore 2N, US	monthly rain	101.6 mm (4.0 in)	43.2 mm (1.7 in)	19 years	61 of 100 (Major)
20 April 1977	Grand Coteau, US	daily rain	185.4 mm (7.3 in)	109.2 mm (4.3 in)	42 years	60 of 100 (Major)
20 April 1977	Tuapse, RU	monthly rain	68.7 mm (2.7 in)	30.5 mm (1.2 in)	15 years	58 of 100 (Notable)
20 April 1977	Hana 354, US	daily rain	96.5 mm (3.8 in)	78.5 mm (3.1 in)	38 years	58 of 100 (Notable)
20 April 1977	Jourdanton, US	daily rain	69.9 mm (2.8 in)	57.2 mm (2.3 in)	60 years	56 of 100 (Notable)
20 April 1977	Shamrock, US	daily rain	87.6 mm (3.4 in)	62.2 mm (2.4 in)	40 years	56 of 100 (Notable)
20 April 1977	Wakeeney, US	daily rain	51.3 mm (2.0 in)	25.9 mm (1.0 in)	64 years	54 of 100 (Notable)
20 April 1977	Plainville 4WNW, US	daily rain	45.7 mm (1.8 in)	21.3 mm (0.8 in)	68 years	52 of 100 (Notable)
20 April 1977	Jeddo 3S, US	daily rain	159.5 mm (6.3 in)	131.6 mm (5.2 in)	28 years	51 of 100 (Notable)
20 April 1977	Acatlan de Osorio (Smn), MX	daily low max	21.7 C (71.1 F)	10.5 C (18.9 F)	24 years	50 of 100 (Notable)
20 April 1977	Itaju, BR	daily rain	99.5 mm (3.9 in)	68.9 mm (2.7 in)	16 years	47 of 100 (Notable)
20 April 1977	Sterling, US	daily rain	35.1 mm (1.4 in)	19.9 mm (0.8 in)	44 years	45 of 100 (Notable)
20 April 1977	Fleming, US	daily snowfall	7.6 cm (3.0 in)	7.6 cm (3.0 in)	81 years	44 of 100 (Notable)
20 April 1977	Lamoni, US	daily rain	47.2 mm (1.9 in)	20.8 mm (0.8 in)	59 years	44 of 100 (Notable)
20 April 1977	Emu Park Hill St, AU	daily rain	47.0 mm (1.9 in)	19.8 mm (0.8 in)	81 years	42 of 100 (Notable)
20 April 1977	Baependi, BR	daily rain	50.5 mm (2.0 in)	39.2 mm (1.5 in)	8 years	42 of 100 (Notable)
20 April 1977	Guaratingueta, BR	daily rain	48.2 mm (1.9 in)	32.1 mm (1.3 in)	19 years	42 of 100 (Notable)
20 April 1977	Quinter, US	daily rain	47.0 mm (1.9 in)	24.1 mm (0.9 in)	28 years	42 of 100 (Notable)
20 April 1977	Upland 2NE, US	monthly rain	70.4 mm (2.8 in)	17.1 mm (0.7 in)	33 years	42 of 100 (Notable)
20 April 1977	Lodgepole, US	monthly rain	59.4 mm (2.3 in)	6.1 mm (0.24 in)	57 years	41 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 1977

Records set or tied on this calendar date in each year from 1807 to 1977. 1977 had 693 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 1977-04-20: 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	564
50 to 100	9
100 to 150	3
150 to 200	0
200 to 250	0
250 to 300	1