Weather Records on 15 April 1977

649 weather records were set or tied worldwide on 15 April 1977. Highest significance: Llano, US.

Key Facts for 15 April 1977

On 15 April 1977, 649 weather records were set or tied at long-record stations worldwide.
278 were record highs and 82 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 11 monthly and 638 daily.
Llano set a monthly record daily precipitation of 161.3 mm (6.4 in) on 15 April 1977.
Across 159 earlier years (1801 to 2026) the same calendar date averaged 492 records.

Record Map

649 stations

649 station records on 15 April 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 15 April 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Llano	United States	Record daily precipitation	161.3 mm (6.4 in)	81 of 100 (Exceptional)
Paint Rock	United States	Record daily precipitation	74.7 mm (2.9 in)	60 of 100 (Major)
Harper 3ENE	United States	Record daily precipitation	104.1 mm (4.1 in)	56 of 100 (Notable)
Alat	Azerbaijan	Record daily precipitation	32.8 mm (1.3 in)	55 of 100 (Notable)
Baku	Azerbaijan	Record daily precipitation	25.8 mm (1.0 in)	52 of 100 (Notable)
Arnold	United States	Record daily precipitation	50.0 mm (2.0 in)	52 of 100 (Notable)
Cleburne	United States	Record daily precipitation	87.6 mm (3.4 in)	52 of 100 (Notable)
Gazimammad Aerodrom	Azerbaijan	Record daily precipitation	28.2 mm (1.1 in)	48 of 100 (Notable)
Sonora	United States	Record daily precipitation	82.8 mm (3.3 in)	48 of 100 (Notable)
Litchfield	United States	Record daily precipitation	44.5 mm (1.8 in)	47 of 100 (Notable)
Copperas Cove	United States	Record daily precipitation	96.3 mm (3.8 in)	46 of 100 (Notable)
Bilasuvar	Azerbaijan	Record daily precipitation	27.6 mm (1.1 in)	44 of 100 (Notable)
Carbean	Australia	Record daily precipitation	38.0 mm (1.5 in)	43 of 100 (Notable)
Holyoke	United States	Record daily precipitation	27.9 mm (1.1 in)	42 of 100 (Notable)
Belgrade (Observatory)	Serbia	Record daily precipitation	39.4 mm (1.6 in)	41 of 100 (Notable)
Antelope	United States	Record daily precipitation	26.7 mm (1.1 in)	41 of 100 (Notable)
Burleson 2 SSW	United States	Record daily precipitation	88.9 mm (3.5 in)	41 of 100 (Notable)
Fizuly	Azerbaijan	Record daily precipitation	26.7 mm (1.1 in)	40 of 100 (Notable)
Aurukun Shire Council	Australia	Record daily precipitation	75.0 mm (3.0 in)	40 of 100 (Notable)
Bargara	Australia	Record daily precipitation	88.7 mm (3.5 in)	40 of 100 (Notable)
Coleman	United States	Record daily precipitation	35.6 mm (1.4 in)	40 of 100 (Notable)
Lampasas	United States	Record daily precipitation	83.3 mm (3.3 in)	40 of 100 (Notable)
Mason	United States	Record daily precipitation	49.0 mm (1.9 in)	40 of 100 (Notable)
Campbell	United States	Record daily precipitation	33.0 mm (1.3 in)	39 of 100 (Notable)
Cimarron 4 SW	United States	Record daily precipitation	26.7 mm (1.1 in)	39 of 100 (Notable)
Burnet	United States	Record daily precipitation	90.2 mm (3.6 in)	39 of 100 (Notable)
Watertown Rgnl AP	United States	Record high minimum temperature	10.6 C (51.1 F)	39 of 100 (Notable)
Burnett Heads Niell St	Australia	Record daily precipitation	46.0 mm (1.8 in)	37 of 100 (Notable)
Fergus Falls	United States	Record daily precipitation	39.1 mm (1.5 in)	37 of 100 (Notable)
Cumberland	United States	Record daily precipitation	41.9 mm (1.6 in)	37 of 100 (Notable)
Kvikkjokk-Arrenjarka	Sweden	Record snow depth	110.0 cm (43.3 in)	36 of 100 (Notable)
Elk Rvr	United States	Record daily precipitation	45.2 mm (1.8 in)	36 of 100 (Notable)
Mertzon	United States	Record daily precipitation	53.6 mm (2.1 in)	36 of 100 (Notable)
San Angelo	United States	Record daily precipitation	40.4 mm (1.6 in)	36 of 100 (Notable)
Sal'jny	Azerbaijan	Record daily precipitation	28.3 mm (1.1 in)	35 of 100 (Notable)
Anna	United States	Record daily precipitation	41.9 mm (1.6 in)	35 of 100 (Notable)
Gyzylarbat	Turkmenistan	Record high minimum temperature	21.3 C (70.3 F)	34 of 100 (Routine)
Marengo	United States	Record high maximum temperature	28.3 C (82.9 F)	34 of 100 (Routine)
Floresville	United States	Record daily precipitation	52.3 mm (2.1 in)	34 of 100 (Routine)
Rockville	United States	Record high maximum temperature	28.3 C (82.9 F)	33 of 100 (Routine)
Scottsbluff W B Heilig Fld AP	United States	Record daily precipitation	33.3 mm (1.3 in)	33 of 100 (Routine)
Aurora	Brazil	Record daily precipitation	78.2 mm (3.1 in)	32 of 100 (Routine)
Allenspark 2SE	United States	Record daily precipitation	48.3 mm (1.9 in)	32 of 100 (Routine)
Decatur Wtp	United States	Record high maximum temperature	29.4 C (84.9 F)	32 of 100 (Routine)
Monmouth	United States	Record high maximum temperature	30.0 C (86.0 F)	32 of 100 (Routine)
Vevay	United States	Record high maximum temperature	28.3 C (82.9 F)	32 of 100 (Routine)
Milaca	United States	Record high maximum temperature	25.0 C (77.0 F)	32 of 100 (Routine)
New Ulm 2 SE	United States	Record high minimum temperature	11.1 C (52.0 F)	32 of 100 (Routine)
Reedsburg Wwtp	United States	Record high maximum temperature	30.0 C (86.0 F)	32 of 100 (Routine)
Atlatlahuacan	Mexico	Record low minimum temperature	6.7 C (44.1 F)	30 of 100 (Routine)
Sugarloaf Rsvr	United States	Record high minimum temperature	-2.2 C (28.0 F)	30 of 100 (Routine)
Killeen	United States	Record daily precipitation	119.9 mm (4.7 in)	30 of 100 (Routine)
Fairymead Sugar Mill	Australia	Record daily precipitation	41.0 mm (1.6 in)	29 of 100 (Routine)
Gwabegar Post Office	Australia	Record daily precipitation	32.0 mm (1.3 in)	29 of 100 (Routine)
Puerto Madero	Mexico	Record low maximum temperature	26.7 C (80.1 F)	29 of 100 (Routine)
Albion	United States	Record high maximum temperature	30.0 C (86.0 F)	29 of 100 (Routine)
Ft Robinson	United States	Record high minimum temperature	10.0 C (50.0 F)	29 of 100 (Routine)
Auburn	United States	Record high maximum temperature	25.0 C (77.0 F)	29 of 100 (Routine)
Ballinger 2 NW	United States	Record daily precipitation	38.1 mm (1.5 in)	29 of 100 (Routine)
Cuero	United States	Record daily precipitation	32.0 mm (1.3 in)	29 of 100 (Routine)

Counts by Type and Timescale

649 records

Records set or tied on 15 April 1977 by type: Highest daily maximum 179, Lowest daily maximum 60, Highest daily minimum 99, Lowest daily minimum 22, Heaviest daily rainfall 250, Heaviest daily snowfall 12, Deepest snow cover 27.

Records on 15 April 1977 by type
Record type	Records
Highest daily maximum	179
Lowest daily maximum	60
Highest daily minimum	99
Lowest daily minimum	22
Heaviest daily rainfall	250
Heaviest daily snowfall	12
Deepest snow cover	27

Records on 15 April 1977 by timescale: all-time 0, monthly 11, daily 638.

How Much Records Were Beaten By

518 broken records

Margins by which the 518 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

15 April 1977

Top 20 records on 15 April 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
15 April 1977	Llano, US	monthly rain	161.3 mm (6.4 in)	68.6 mm (2.7 in)	77 years	81 of 100 (Exceptional)
15 April 1977	Paint Rock, US	daily rain	74.7 mm (2.9 in)	55.9 mm (2.2 in)	47 years	60 of 100 (Major)
15 April 1977	Harper 3ENE, US	monthly rain	104.1 mm (4.1 in)	32.2 mm (1.3 in)	66 years	56 of 100 (Notable)
15 April 1977	Alat, AZ	daily rain	32.8 mm (1.3 in)	24.8 mm (1.0 in)	38 years	55 of 100 (Notable)
15 April 1977	Baku, AZ	daily rain	25.8 mm (1.0 in)	11.3 mm (0.4 in)	88 years	52 of 100 (Notable)
15 April 1977	Arnold, US	daily rain	50.0 mm (2.0 in)	42.4 mm (1.7 in)	32 years	52 of 100 (Notable)
15 April 1977	Cleburne, US	daily rain	87.6 mm (3.4 in)	59.7 mm (2.4 in)	39 years	52 of 100 (Notable)
15 April 1977	Gazimammad Aerodrom, AZ	daily rain	28.2 mm (1.1 in)	20.8 mm (0.8 in)	36 years	48 of 100 (Notable)
15 April 1977	Sonora, US	daily rain	82.8 mm (3.3 in)	72.4 mm (2.9 in)	4 years	48 of 100 (Notable)
15 April 1977	Litchfield, US	daily rain	44.5 mm (1.8 in)	30.8 mm (1.2 in)	8 years	47 of 100 (Notable)
15 April 1977	Copperas Cove, US	daily rain	96.3 mm (3.8 in)	43.0 mm (1.7 in)	60 years	46 of 100 (Notable)
15 April 1977	Bilasuvar, AZ	daily rain	27.6 mm (1.1 in)	17.2 mm (0.7 in)	24 years	44 of 100 (Notable)
15 April 1977	Carbean, AU	daily rain	38.0 mm (1.5 in)	35.5 mm (1.4 in)	30 years	43 of 100 (Notable)
15 April 1977	Holyoke, US	daily rain	27.9 mm (1.1 in)	11.4 mm (0.4 in)	76 years	42 of 100 (Notable)
15 April 1977	Belgrade (Observatory), RS	monthly rain	39.4 mm (1.6 in)	8.4 mm (0.33 in)	39 years	41 of 100 (Notable)
15 April 1977	Antelope, US	daily rain	26.7 mm (1.1 in)	26.7 mm (1.1 in)	66 years	41 of 100 (Notable)
15 April 1977	Burleson 2 SSW, US	daily rain	88.9 mm (3.5 in)	57.4 mm (2.3 in)	20 years	41 of 100 (Notable)
15 April 1977	Fizuly, AZ	daily rain	26.7 mm (1.1 in)	15.1 mm (0.6 in)	36 years	40 of 100 (Notable)
15 April 1977	Aurukun Shire Council, AU	daily rain	75.0 mm (3.0 in)	39.4 mm (1.6 in)	50 years	40 of 100 (Notable)
15 April 1977	Bargara, AU	daily rain	88.7 mm (3.5 in)	74.5 mm (2.9 in)	30 years	40 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

1801 to 1977

Records set or tied on this calendar date in each year from 1801 to 1977. 1977 had 649 records.

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

Records on 04-15 in each year
Year	Records
1801	1
1817	1
1820	1
1844	1
1845	1
1847	1
1849	1
1853	2
1855	2
1858	1
1862	3
1865	3
1866	1
1868	1
1869	2
1873	1
1874	1
1876	1
1880	1
1882	1
1885	3
1886	1
1887	3
1889	2
1890	3
1891	2
1892	8
1893	2
1894	1
1896	2
1897	1
1898	2
1899	4
1900	9
1901	2
1902	4
1903	8
1904	39
1905	11
1906	20
1907	18
1908	15
1909	18
1910	16
1911	20
1912	24
1913	39
1914	17
1915	13
1916	15
1917	35
1918	40
1919	22
1920	50
1921	59
1922	94
1923	178
1924	172
1925	168
1926	453
1927	321
1928	631
1929	91
1930	289
1931	388
1932	150
1933	300
1934	339
1935	515
1936	439
1937	277
1938	596
1939	789
1940	581
1941	628
1942	525
1943	1,037
1944	313
1945	783
1946	245
1947	532
1948	306
1949	419
1950	568
1951	504
1952	357
1953	475
1954	896
1955	484
1956	750
1957	378
1958	458
1959	314
1960	319
1961	877
1962	733
1963	714
1964	382
1965	504
1966	464
1967	599
1968	476
1969	555
1970	841
1971	640
1972	896
1973	667
1974	385
1975	780
1976	1,566
1977	649
1978	426
1979	370
1980	1,066
1981	724
1982	955
1983	1,343
1984	612
1985	788
1986	1,140
1987	579
1988	839
1989	836
1990	837
1991	769
1992	783
1993	1,156
1994	835
1995	805
1996	1,173
1997	1,031
1998	1,752
1999	1,249
2000	1,163
2001	1,043
2002	1,866
2003	1,760
2004	761
2005	583
2006	1,637
2007	1,776
2008	1,157
2009	853
2010	804
2011	1,162
2012	1,007
2013	1,146
2014	1,721
2015	739
2016	602
2017	474
2018	1,913
2019	610
2020	1,068
2021	494
2022	1,145
2023	912
2024	1,096
2025	860
2026	1,118

Download the Data

Data for records on 1977-04-15: 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	505
50 to 100	9
100 to 150	1
150 to 200	2
200 to 250	1