Weather Records on 18 April 1977

717 weather records were set or tied worldwide on 18 April 1977. Highest significance: Grand Rapids Forestry Lab, US.

Key Facts for 18 April 1977

On 18 April 1977, 717 weather records were set or tied at long-record stations worldwide.
395 were record highs and 98 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 15 monthly and 702 daily.
Grand Rapids Forestry Lab set a daily record precipitation of 31.5 mm (1.2 in) on 18 April 1977.
Across 160 earlier years (1793 to 2026) the same calendar date averaged 466 records.

Record Map

717 stations

717 station records on 18 April 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 April 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Grand Rapids Forestry Lab	United States	Record daily precipitation	31.5 mm (1.2 in)	49 of 100 (Notable)
King Junction	Australia	Record daily precipitation	48.8 mm (1.9 in)	47 of 100 (Notable)
Prescott 2 NNW	United States	Record daily precipitation	90.7 mm (3.6 in)	47 of 100 (Notable)
Las Vegas Muni AP	United States	Record daily precipitation	25.9 mm (1.0 in)	46 of 100 (Notable)
Huichapan	Mexico	Record low maximum temperature	11.7 C (53.1 F)	45 of 100 (Notable)
Ottertail	United States	Record daily precipitation	39.4 mm (1.6 in)	43 of 100 (Notable)
Albert Lea 3SE	United States	Record daily precipitation	40.6 mm (1.6 in)	42 of 100 (Notable)
Academy 2NE	United States	Record daily precipitation	35.8 mm (1.4 in)	42 of 100 (Notable)
Melnichnoe	Russia	Record daily precipitation	44.1 mm (1.7 in)	41 of 100 (Notable)
Naples 1 SW	United States	Record daily precipitation	72.6 mm (2.9 in)	41 of 100 (Notable)
Vila Carmem	Brazil	Record daily precipitation	33.4 mm (1.3 in)	40 of 100 (Notable)
Pompeia	Brazil	Record daily precipitation	40.6 mm (1.6 in)	39 of 100 (Notable)
Cambridge	United States	Record high minimum temperature	11.7 C (53.1 F)	39 of 100 (Notable)
Wheaton	United States	Record daily precipitation	29.7 mm (1.2 in)	39 of 100 (Notable)
Kirensk	Russia	Record high minimum temperature	4.8 C (40.6 F)	37 of 100 (Notable)
Sovetskaja Gavan	Russia	Record daily precipitation	33.0 mm (1.3 in)	37 of 100 (Notable)
Luckhoff (Pol)	South Africa	Record daily precipitation	31.5 mm (1.2 in)	37 of 100 (Notable)
New Ulm 2 SE	United States	Record high minimum temperature	15.0 C (59.0 F)	37 of 100 (Notable)
Lake Mills Wwtp	United States	Record high maximum temperature	30.0 C (86.0 F)	37 of 100 (Notable)
Marengo	United States	Record high maximum temperature	31.1 C (88.0 F)	36 of 100 (Notable)
Caledonia	United States	Record high maximum temperature	27.2 C (81.0 F)	36 of 100 (Notable)
Watertown Rgnl AP	United States	Record daily precipitation	33.0 mm (1.3 in)	36 of 100 (Notable)
Zolotoj	Russia	Record daily precipitation	48.7 mm (1.9 in)	35 of 100 (Notable)
Rudnaja Pristan	Russia	Record daily precipitation	65.7 mm (2.6 in)	35 of 100 (Notable)
Dixon Wwtp	United States	Record high maximum temperature	30.6 C (87.1 F)	35 of 100 (Notable)
Little Falls 2NNE	United States	Record daily precipitation	27.4 mm (1.1 in)	35 of 100 (Notable)
Kakinada	India	Record daily precipitation	31.0 mm (1.2 in)	34 of 100 (Routine)
Galesburg	United States	Record high minimum temperature	15.6 C (60.1 F)	34 of 100 (Routine)
Ottawa 4SW	United States	Record high maximum temperature	32.2 C (90.0 F)	34 of 100 (Routine)
Three Rivers	United States	Record high maximum temperature	30.0 C (86.0 F)	34 of 100 (Routine)
Portage Wwtp	United States	Record high maximum temperature	28.9 C (84.0 F)	34 of 100 (Routine)
Widgee Station Hill	Australia	Record daily precipitation	48.4 mm (1.9 in)	33 of 100 (Routine)
Willows 6 W	United States	Record high minimum temperature	15.0 C (59.0 F)	33 of 100 (Routine)
Aurora Water	United States	Record high maximum temperature	31.1 C (88.0 F)	33 of 100 (Routine)
Anderson 1 N	United States	Record high maximum temperature	29.4 C (84.9 F)	33 of 100 (Routine)
Bloomington Indiana UNIV	United States	Record high maximum temperature	30.6 C (87.1 F)	33 of 100 (Routine)
Bay City	United States	Record high maximum temperature	27.8 C (82.0 F)	33 of 100 (Routine)
Owosso Wwtp	United States	Record high maximum temperature	28.3 C (82.9 F)	33 of 100 (Routine)
Fairmont	United States	Record high minimum temperature	12.2 C (54.0 F)	33 of 100 (Routine)
Clark	United States	Record daily precipitation	30.0 mm (1.2 in)	33 of 100 (Routine)
Wilmot	United States	Record daily precipitation	30.5 mm (1.2 in)	33 of 100 (Routine)
Bai'tyk	Kyrgyzstan	Record daily precipitation	31.5 mm (1.2 in)	32 of 100 (Routine)
Hot Springs 1 NNE	United States	Record daily precipitation	37.3 mm (1.5 in)	32 of 100 (Routine)
Galva	United States	Record high maximum temperature	29.4 C (84.9 F)	32 of 100 (Routine)
Jacksonville 2E	United States	Record high maximum temperature	30.0 C (86.0 F)	32 of 100 (Routine)
Springfield 1 NW	United States	Record daily precipitation	34.8 mm (1.4 in)	32 of 100 (Routine)
Jefferson	United States	Record daily precipitation	50.8 mm (2.0 in)	32 of 100 (Routine)
West Bend	United States	Record high maximum temperature	26.1 C (79.0 F)	32 of 100 (Routine)
McAlester Rgnl AP	United States	Record daily precipitation	38.9 mm (1.5 in)	32 of 100 (Routine)
Kilkivan Post Office	Australia	Record daily precipitation	56.8 mm (2.2 in)	31 of 100 (Routine)
Ibitiuva	Brazil	Record daily precipitation	53.6 mm (2.1 in)	31 of 100 (Routine)
Sparkman	United States	Record daily precipitation	52.3 mm (2.1 in)	30 of 100 (Routine)
New Meadows Rs	United States	Record low minimum temperature	-10.6 C (12.9 F)	30 of 100 (Routine)
Estherville 4E	United States	Record high minimum temperature	13.3 C (55.9 F)	30 of 100 (Routine)
Mullen 3S	United States	Record daily precipitation	69.6 mm (2.7 in)	30 of 100 (Routine)
Idabel	United States	Record daily precipitation	48.3 mm (1.9 in)	30 of 100 (Routine)
Wisconsin Rapids	United States	Record high maximum temperature	30.6 C (87.1 F)	30 of 100 (Routine)
Boughton	United States	Record daily precipitation	58.4 mm (2.3 in)	29 of 100 (Routine)
Northwood	United States	Record high minimum temperature	13.3 C (55.9 F)	29 of 100 (Routine)
Pocahontas	United States	Record high minimum temperature	13.3 C (55.9 F)	29 of 100 (Routine)

Counts by Type and Timescale

717 records

Records set or tied on 18 April 1977 by type: Highest daily maximum 243, Lowest daily maximum 41, Highest daily minimum 152, Lowest daily minimum 57, Heaviest daily rainfall 214, Heaviest daily snowfall 5, Deepest snow cover 5.

Records on 18 April 1977 by type
Record type	Records
Highest daily maximum	243
Lowest daily maximum	41
Highest daily minimum	152
Lowest daily minimum	57
Heaviest daily rainfall	214
Heaviest daily snowfall	5
Deepest snow cover	5

Records on 18 April 1977 by timescale: all-time 0, monthly 15, daily 702.

How Much Records Were Beaten By

565 broken records

Margins by which the 565 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

18 April 1977

Top 20 records on 18 April 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 April 1977	Grand Rapids Forestry Lab, US	daily rain	31.5 mm (1.2 in)	21.1 mm (0.8 in)	46 years	49 of 100 (Notable)
18 April 1977	King Junction, AU	daily rain	48.8 mm (1.9 in)	37.9 mm (1.5 in)	54 years	47 of 100 (Notable)
18 April 1977	Prescott 2 NNW, US	daily rain	90.7 mm (3.6 in)	32.8 mm (1.3 in)	76 years	47 of 100 (Notable)
18 April 1977	Las Vegas Muni AP, US	daily rain	25.9 mm (1.0 in)	19.0 mm (0.7 in)	32 years	46 of 100 (Notable)
18 April 1977	Huichapan, MX	daily low max	11.7 C (53.1 F)	8.9 C (16.0 F)	40 years	45 of 100 (Notable)
18 April 1977	Ottertail, US	daily rain	39.4 mm (1.6 in)	33.8 mm (1.3 in)	2 years	43 of 100 (Notable)
18 April 1977	Albert Lea 3SE, US	daily rain	40.6 mm (1.6 in)	10.1 mm (0.4 in)	78 years	42 of 100 (Notable)
18 April 1977	Academy 2NE, US	daily rain	35.8 mm (1.4 in)	16.2 mm (0.6 in)	60 years	42 of 100 (Notable)
18 April 1977	Melnichnoe, RU	monthly rain	44.1 mm (1.7 in)	9.2 mm (0.36 in)	17 years	41 of 100 (Notable)
18 April 1977	Naples 1 SW, US	daily rain	72.6 mm (2.9 in)	33.2 mm (1.3 in)	66 years	41 of 100 (Notable)
18 April 1977	Vila Carmem, BR	daily rain	33.4 mm (1.3 in)	31.1 mm (1.2 in)	38 years	40 of 100 (Notable)
18 April 1977	Pompeia, BR	daily rain	40.6 mm (1.6 in)	35.6 mm (1.4 in)	39 years	39 of 100 (Notable)
18 April 1977	Cambridge, US	daily high min	11.7 C (53.1 F)	3.9 C (7.0 F)	82 years	39 of 100 (Notable)
18 April 1977	Wheaton, US	daily rain	29.7 mm (1.2 in)	16.2 mm (0.6 in)	48 years	39 of 100 (Notable)
18 April 1977	Kirensk, RU	daily high min	4.8 C (40.6 F)	3.8 C (6.8 F)	83 years	37 of 100 (Notable)
18 April 1977	Sovetskaja Gavan, RU	daily rain	33.0 mm (1.3 in)	20.3 mm (0.8 in)	4 years	37 of 100 (Notable)
18 April 1977	Luckhoff (Pol), ZA	daily rain	31.5 mm (1.2 in)	12.4 mm (0.5 in)	66 years	37 of 100 (Notable)
18 April 1977	New Ulm 2 SE, US	daily high min	15.0 C (59.0 F)	2.8 C (5.0 F)	82 years	37 of 100 (Notable)
18 April 1977	Lake Mills Wwtp, US	daily high max	30.0 C (86.0 F)	3.3 C (5.9 F)	80 years	37 of 100 (Notable)
18 April 1977	Marengo, US	daily high max	31.1 C (88.0 F)	3.3 C (5.9 F)	80 years	36 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

1793 to 1977

Records set or tied on this calendar date in each year from 1793 to 1977. 1977 had 717 records.

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

Records on 04-18 in each year
Year	Records
1793	1
1807	2
1815	1
1838	1
1847	1
1849	1
1851	1
1852	3
1854	3
1855	1
1865	4
1867	1
1870	1
1871	1
1875	4
1877	2
1878	1
1879	3
1880	2
1884	2
1886	2
1887	3
1888	1
1889	1
1890	2
1891	1
1892	3
1893	5
1894	7
1895	2
1896	3
1897	5
1898	8
1899	2
1900	2
1901	6
1902	5
1903	11
1904	9
1905	12
1906	18
1907	17
1908	37
1909	19
1910	19
1911	25
1912	21
1913	26
1914	38
1915	31
1916	22
1917	40
1918	76
1919	16
1920	64
1921	58
1922	85
1923	107
1924	101
1925	154
1926	322
1927	391
1928	323
1929	126
1930	113
1931	173
1932	326
1933	211
1934	391
1935	264
1936	483
1937	477
1938	711
1939	525
1940	322
1941	496
1942	287
1943	298
1944	259
1945	371
1946	357
1947	444
1948	932
1949	345
1950	244
1951	658
1952	536
1953	1,322
1954	442
1955	817
1956	467
1957	629
1958	370
1959	468
1960	320
1961	520
1962	484
1963	662
1964	449
1965	363
1966	776
1967	882
1968	867
1969	795
1970	771
1971	1,106
1972	470
1973	953
1974	326
1975	751
1976	1,309
1977	717
1978	803
1979	841
1980	842
1981	708
1982	616
1983	2,082
1984	625
1985	1,119
1986	622
1987	1,068
1988	936
1989	625
1990	1,368
1991	780
1992	702
1993	730
1994	1,218
1995	1,601
1996	826
1997	1,256
1998	1,011
1999	1,428
2000	912
2001	1,487
2002	2,084
2003	969
2004	846
2005	622
2006	1,262
2007	675
2008	913
2009	624
2010	478
2011	1,122
2012	744
2013	2,509
2014	534
2015	519
2016	973
2017	588
2018	1,202
2019	601
2020	770
2021	592
2022	1,013
2023	739
2024	641
2025	997
2026	498

Download the Data

Data for records on 1977-04-18: 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	562
50 to 100	1
100 to 150	0
150 to 200	1
200 to 250	0
250 to 300	1