Weather Records on 18 April 1984

625 weather records were set or tied worldwide on 18 April 1984. Highest significance: Koonamore, AU.

Key Facts for 18 April 1984

On 18 April 1984, 625 weather records were set or tied at long-record stations worldwide.
204 were record highs and 292 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 13 monthly and 611 daily.
Koonamore set a monthly record daily precipitation of 84.0 mm (3.3 in) on 18 April 1984.
Across 160 earlier years (1793 to 2026) the same calendar date averaged 466 records.

Record Map

625 stations

625 station records on 18 April 1984 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 April 1984: highest significance records shown on the map
Station	Country	Type	Value	Significance
Koonamore	Australia	Record daily precipitation	84.0 mm (3.3 in)	71 of 100 (Major)
Santa Lucia	Brazil	Record daily precipitation	56.2 mm (2.2 in)	50 of 100 (Notable)
Achinsk	Russia	Record low minimum temperature	-19.0 C (-2.2 F)	45 of 100 (Notable)
Garcia	Brazil	Record daily precipitation	78.0 mm (3.1 in)	37 of 100 (Notable)
Mokpo	Korea, South	Record daily precipitation	71.0 mm (2.8 in)	37 of 100 (Notable)
Aztec Ruins Nm	United States	Record high minimum temperature	8.9 C (48.0 F)	37 of 100 (Notable)
Dulce	United States	Record high minimum temperature	5.6 C (42.1 F)	37 of 100 (Notable)
Glenwood Spgs #2	United States	Record high minimum temperature	6.7 C (44.1 F)	36 of 100 (Notable)
Fitzgerald	United States	Record low maximum temperature	17.8 C (64.0 F)	35 of 100 (Notable)
Forsyth 6 NNW	United States	Record low minimum temperature	0.6 C (33.1 F)	35 of 100 (Notable)
Hatch	United States	Record high minimum temperature	14.4 C (57.9 F)	35 of 100 (Notable)
Jerilderie (Pooginook)	Australia	Record daily precipitation	40.0 mm (1.6 in)	34 of 100 (Routine)
Villa Ahumada	Mexico	Record high minimum temperature	16.7 C (62.1 F)	34 of 100 (Routine)
Pine Bluff	United States	Record low minimum temperature	1.1 C (34.0 F)	34 of 100 (Routine)
Waynesboro 2 S	United States	Record low maximum temperature	18.3 C (64.9 F)	34 of 100 (Routine)
Waynesboro	United States	Record low maximum temperature	13.3 C (55.9 F)	34 of 100 (Routine)
Ostuta	Mexico	Record low minimum temperature	15.0 C (59.0 F)	33 of 100 (Routine)
Bakchar	Russia	Record low minimum temperature	-30.2 C (-22.4 F)	33 of 100 (Routine)
Krasnojarsk	Russia	Record low minimum temperature	-15.4 C (4.3 F)	33 of 100 (Routine)
Gaudan-In-Turkmen	Turkmenistan	Record daily precipitation	29.4 mm (1.2 in)	33 of 100 (Routine)
Pervomajskoe	Russia	Record low minimum temperature	-20.8 C (-5.4 F)	32 of 100 (Routine)
Montrose #2	United States	Record high minimum temperature	10.0 C (50.0 F)	32 of 100 (Routine)
Chickamauga 2 SW	United States	Record low maximum temperature	11.1 C (52.0 F)	32 of 100 (Routine)
University	United States	Record low minimum temperature	-1.1 C (30.0 F)	32 of 100 (Routine)
Palizada	Mexico	Record low minimum temperature	15.6 C (60.1 F)	31 of 100 (Routine)
Dudinka	Russia	Record low maximum temperature	-27.0 C (-16.6 F)	31 of 100 (Routine)
Dudinka	Russia	Record low minimum temperature	-37.5 C (-35.5 F)	31 of 100 (Routine)
Zmeinogorsk	Russia	Record low minimum temperature	-9.6 C (14.7 F)	31 of 100 (Routine)
Bochil	Mexico	Record low minimum temperature	5.0 C (41.0 F)	30 of 100 (Routine)
Achinsk	Russia	Record low maximum temperature	-8.3 C (17.1 F)	30 of 100 (Routine)
Chinook	United States	Record high minimum temperature	9.4 C (48.9 F)	30 of 100 (Routine)
Hachita 1W	United States	Record high minimum temperature	14.4 C (57.9 F)	30 of 100 (Routine)
Mtn Park	United States	Record high minimum temperature	11.7 C (53.1 F)	30 of 100 (Routine)
Graham	United States	Record high maximum temperature	35.0 C (95.0 F)	30 of 100 (Routine)
Hateruma	Japan	Record daily precipitation	294.5 mm (11.6 in)	29 of 100 (Routine)
Buenavista de Cuellar	Mexico	Record low maximum temperature	28.3 C (82.9 F)	29 of 100 (Routine)
Tot-Ma	Russia	Record high minimum temperature	6.8 C (44.2 F)	29 of 100 (Routine)
Pudino	Russia	Record low minimum temperature	-30.4 C (-22.7 F)	29 of 100 (Routine)
Bolotnoe	Russia	Record low minimum temperature	-19.7 C (-3.5 F)	29 of 100 (Routine)
Phuket	Thailand	Record daily precipitation	76.1 mm (3.0 in)	29 of 100 (Routine)
Alicia 2 NNE	United States	Record low minimum temperature	1.1 C (34.0 F)	29 of 100 (Routine)
Alamogordo	United States	Record high minimum temperature	17.8 C (64.0 F)	29 of 100 (Routine)
Tomsk	Russia	Record low maximum temperature	-8.0 C (17.6 F)	28 of 100 (Routine)
Don Muang	Thailand	Record daily precipitation	35.1 mm (1.4 in)	28 of 100 (Routine)
Calico Rock 2 WSW	United States	Record low minimum temperature	-3.3 C (26.1 F)	28 of 100 (Routine)
Dublin	United States	Record low maximum temperature	18.3 C (64.9 F)	28 of 100 (Routine)
Libby 1 NE Rs	United States	Record high minimum temperature	6.1 C (43.0 F)	28 of 100 (Routine)
Cookeville	United States	Record low maximum temperature	8.3 C (46.9 F)	28 of 100 (Routine)
Dubois	United States	Record high minimum temperature	5.0 C (41.0 F)	28 of 100 (Routine)
Cristina	Brazil	Record daily precipitation	32.8 mm (1.3 in)	27 of 100 (Routine)
Blumenau (Pcd)	Brazil	Record daily precipitation	72.4 mm (2.9 in)	27 of 100 (Routine)
Ribeiro Dos Santos	Brazil	Record daily precipitation	30.3 mm (1.2 in)	27 of 100 (Routine)
Paraiso	Mexico	Record low minimum temperature	15.0 C (59.0 F)	27 of 100 (Routine)
Samaria	Mexico	Record low minimum temperature	13.3 C (55.9 F)	27 of 100 (Routine)
Valley Head	United States	Record low maximum temperature	11.1 C (52.0 F)	27 of 100 (Routine)
Trout Lake	United States	Record snow depth	162.6 cm (64.0 in)	27 of 100 (Routine)
Challis	United States	Record high minimum temperature	6.7 C (44.1 F)	27 of 100 (Routine)
Elk City 1NE	United States	Record high minimum temperature	3.3 C (37.9 F)	27 of 100 (Routine)
Warren	United States	Record high minimum temperature	-0.6 C (30.9 F)	27 of 100 (Routine)
Augusta	United States	Record high minimum temperature	6.7 C (44.1 F)	27 of 100 (Routine)

Counts by Type and Timescale

625 records

Records set or tied on 18 April 1984 by type: Highest daily maximum 57, Lowest daily maximum 118, Highest daily minimum 147, Lowest daily minimum 174, Heaviest daily rainfall 119, Heaviest daily snowfall 4, Deepest snow cover 6.

Records on 18 April 1984 by type
Record type	Records
Highest daily maximum	57
Lowest daily maximum	118
Highest daily minimum	147
Lowest daily minimum	174
Heaviest daily rainfall	119
Heaviest daily snowfall	4
Deepest snow cover	6

Records on 18 April 1984 by timescale: all-time 1, monthly 13, daily 611.

How Much Records Were Beaten By

480 broken records

Margins by which the 480 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 51.0. Ties are not counted.

Top 20 by Significance

18 April 1984

Top 20 records on 18 April 1984 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 April 1984	Koonamore, AU	monthly rain	84.0 mm (3.3 in)	24.3 mm (1.0 in)	95 years	71 of 100 (Major)
18 April 1984	Santa Lucia, BR	daily rain	56.2 mm (2.2 in)	42.6 mm (1.7 in)	40 years	50 of 100 (Notable)
18 April 1984	Achinsk, RU	daily low min	-19.0 C (-2.2 F)	8.0 C (14.4 F)	82 years	45 of 100 (Notable)
18 April 1984	Garcia, BR	daily rain	78.0 mm (3.1 in)	31.7 mm (1.2 in)	43 years	37 of 100 (Notable)
18 April 1984	Mokpo, KR	daily rain	71.0 mm (2.8 in)	38.0 mm (1.5 in)	21 years	37 of 100 (Notable)
18 April 1984	Aztec Ruins Nm, US	daily high min	8.9 C (48.0 F)	1.1 C (2.0 F)	86 years	37 of 100 (Notable)
18 April 1984	Dulce, US	daily high min	5.6 C (42.1 F)	3.9 C (7.0 F)	71 years	37 of 100 (Notable)
18 April 1984	Glenwood Spgs #2, US	daily high min	6.7 C (44.1 F)	1.7 C (3.1 F)	79 years	36 of 100 (Notable)
18 April 1984	Fitzgerald, US	daily low max	17.8 C (64.0 F)	1.1 C (2.0 F)	84 years	35 of 100 (Notable)
18 April 1984	Forsyth 6 NNW, US	daily low min	0.6 C (33.1 F)	1.6 C (2.9 F)	79 years	35 of 100 (Notable)
18 April 1984	Hatch, US	daily high min	14.4 C (57.9 F)	1.6 C (2.9 F)	77 years	35 of 100 (Notable)
18 April 1984	Jerilderie (Pooginook), AU	daily rain	40.0 mm (1.6 in)	9.5 mm (0.37 in)	52 years	34 of 100 (Routine)
18 April 1984	Villa Ahumada, MX	daily high min	16.7 C (62.1 F)	1.7 C (3.1 F)	78 years	34 of 100 (Routine)
18 April 1984	Pine Bluff, US	daily low min	1.1 C (34.0 F)	2.8 C (5.0 F)	65 years	34 of 100 (Routine)
18 April 1984	Waynesboro 2 S, US	daily low max	18.3 C (64.9 F)	0.6 C (1.1 F)	82 years	34 of 100 (Routine)
18 April 1984	Waynesboro, US	daily low max	13.3 C (55.9 F)	1.1 C (2.0 F)	77 years	34 of 100 (Routine)
18 April 1984	Ostuta, MX	daily low min	15.0 C (59.0 F)	3.9 C (7.0 F)	36 years	33 of 100 (Routine)
18 April 1984	Bakchar, RU	daily low min	-30.2 C (-22.4 F)	10.3 C (18.5 F)	47 years	33 of 100 (Routine)
18 April 1984	Krasnojarsk, RU	daily low min	-15.4 C (4.3 F)	3.5 C (6.3 F)	68 years	33 of 100 (Routine)
18 April 1984	Gaudan-In-Turkmen, TM	daily rain	29.4 mm (1.2 in)	11.0 mm (0.4 in)	37 years	33 of 100 (Routine)

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 1984

Records set or tied on this calendar date in each year from 1793 to 1984. 1984 had 625 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 1984-04-18: 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 10	446
10 to 20	21
20 to 30	8
30 to 40	2
40 to 50	1
50 to 60	2