Weather Records on 18 May 1984

717 weather records were set or tied worldwide on 18 May 1984. Highest significance: Melrose, US.

Key Facts for 18 May 1984

On 18 May 1984, 717 weather records were set or tied at long-record stations worldwide.
193 were record highs and 243 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 16 monthly and 701 daily.
Melrose set a daily record precipitation of 46.0 mm (1.8 in) on 18 May 1984.
Across 164 earlier years (1796 to 2026) the same calendar date averaged 441 records.

Record Map

717 stations

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

Weather records on 18 May 1984: highest significance records shown on the map
Station	Country	Type	Value	Significance
Melrose	United States	Record daily precipitation	46.0 mm (1.8 in)	64 of 100 (Major)
Clovis	United States	Record daily precipitation	62.5 mm (2.5 in)	55 of 100 (Notable)
Chestnut Hill	United States	Record low minimum temperature	-6.1 C (21.0 F)	54 of 100 (Notable)
Mairipora	Brazil	Record daily precipitation	65.4 mm (2.6 in)	52 of 100 (Notable)
Pedregulho	Brazil	Record daily precipitation	63.1 mm (2.5 in)	49 of 100 (Notable)
Candelaria	United States	Record daily precipitation	31.5 mm (1.2 in)	48 of 100 (Notable)
Glen-Ayle	Australia	Record daily precipitation	50.0 mm (2.0 in)	47 of 100 (Notable)
Heyuan	China	Record daily precipitation	186.0 mm (7.3 in)	47 of 100 (Notable)
Nice	France	Record daily precipitation	44.0 mm (1.7 in)	47 of 100 (Notable)
Qinzhou	China	Record daily precipitation	130.2 mm (5.1 in)	46 of 100 (Notable)
Igarapava	Brazil	Record daily precipitation	56.7 mm (2.2 in)	45 of 100 (Notable)
Ituverava	Brazil	Record daily precipitation	70.9 mm (2.8 in)	45 of 100 (Notable)
Manati 2 E	Puerto Rico [United States]	Record high minimum temperature	24.4 C (75.9 F)	45 of 100 (Notable)
Caninde	Brazil	Record daily precipitation	35.5 mm (1.4 in)	44 of 100 (Notable)
Sao Jose Dos Campos	Brazil	Record daily precipitation	43.6 mm (1.7 in)	44 of 100 (Notable)
Pte de Chassiron	France	Record daily precipitation	32.6 mm (1.3 in)	43 of 100 (Notable)
Brunswick	United States	Record low minimum temperature	10.6 C (51.1 F)	43 of 100 (Notable)
Jeriquara	Brazil	Record daily precipitation	60.2 mm (2.4 in)	42 of 100 (Notable)
Coronel Macedo	Brazil	Record daily precipitation	79.1 mm (3.1 in)	42 of 100 (Notable)
Federal Post Office	Australia	Record daily precipitation	61.0 mm (2.4 in)	40 of 100 (Notable)
Iguatama	Brazil	Record daily precipitation	35.0 mm (1.4 in)	40 of 100 (Notable)
Western 2W	United States	Record daily precipitation	55.9 mm (2.2 in)	40 of 100 (Notable)
Tweed Heads Golf Club	Australia	Record daily precipitation	50.8 mm (2.0 in)	38 of 100 (Notable)
Grodno	Belarus	Record daily precipitation	29.9 mm (1.2 in)	38 of 100 (Notable)
Aguai	Brazil	Record daily precipitation	55.9 mm (2.2 in)	38 of 100 (Notable)
Nazare Paulista	Brazil	Record daily precipitation	37.8 mm (1.5 in)	38 of 100 (Notable)
Mc Cool Junction	United States	Record daily precipitation	63.5 mm (2.5 in)	38 of 100 (Notable)
Pierce 1 E	United States	Record daily precipitation	80.0 mm (3.1 in)	38 of 100 (Notable)
Superior	United States	Record high minimum temperature	15.6 C (60.1 F)	38 of 100 (Notable)
Bambui	Brazil	Record daily precipitation	32.6 mm (1.3 in)	37 of 100 (Notable)
Luminarias	Brazil	Record daily precipitation	42.3 mm (1.7 in)	37 of 100 (Notable)
Taguai (Ribeiropolis)	Brazil	Record daily precipitation	58.3 mm (2.3 in)	37 of 100 (Notable)
Wuzhou	China	Record daily precipitation	79.3 mm (3.1 in)	37 of 100 (Notable)
Yangjiang	China	Record daily precipitation	199.8 mm (7.9 in)	37 of 100 (Notable)
Crescent City	United States	Record high minimum temperature	25.6 C (78.1 F)	37 of 100 (Notable)
Friend 3E	United States	Record daily precipitation	51.8 mm (2.0 in)	37 of 100 (Notable)
Jambeiro	Brazil	Record daily precipitation	28.3 mm (1.1 in)	36 of 100 (Notable)
Kojnas	Russia	Record high minimum temperature	15.6 C (60.1 F)	36 of 100 (Notable)
Poretskoye	Russia	Record high maximum temperature	30.6 C (87.1 F)	36 of 100 (Notable)
Santa Barbara	United States	Record low minimum temperature	4.4 C (39.9 F)	36 of 100 (Notable)
La Plata 1 W	United States	Record low maximum temperature	17.8 C (64.0 F)	36 of 100 (Notable)
Estrela Do Sul	Brazil	Record daily precipitation	29.0 mm (1.1 in)	35 of 100 (Notable)
Fernandina Beach	United States	Record low minimum temperature	12.2 C (54.0 F)	35 of 100 (Notable)
Winning	Australia	Record daily precipitation	26.0 mm (1.0 in)	34 of 100 (Routine)
Baependi	Brazil	Record daily precipitation	41.8 mm (1.6 in)	34 of 100 (Routine)
Baise	China	Record daily precipitation	64.5 mm (2.5 in)	34 of 100 (Routine)
Inverness 3 SE	United States	Record low minimum temperature	11.1 C (52.0 F)	34 of 100 (Routine)
Madison	United States	Record low minimum temperature	11.1 C (52.0 F)	34 of 100 (Routine)
Ribeirao Corrente	Brazil	Record daily precipitation	52.3 mm (2.1 in)	33 of 100 (Routine)
Yemassee 1 N	United States	Record low minimum temperature	6.7 C (44.1 F)	33 of 100 (Routine)
Joanopolis	Brazil	Record daily precipitation	83.9 mm (3.3 in)	32 of 100 (Routine)
Salesopolis	Brazil	Record daily precipitation	40.7 mm (1.6 in)	32 of 100 (Routine)
Luz (Estacao)	Brazil	Record daily precipitation	41.7 mm (1.6 in)	32 of 100 (Routine)
Santa Isabel	Brazil	Record daily precipitation	38.7 mm (1.5 in)	32 of 100 (Routine)
Kandalaksa	Russia	Record high maximum temperature	20.8 C (69.4 F)	32 of 100 (Routine)
Kooskia	United States	Record high minimum temperature	17.2 C (63.0 F)	32 of 100 (Routine)
Columbus 3 NE	United States	Record daily precipitation	46.0 mm (1.8 in)	32 of 100 (Routine)
Russell Island	Australia	Record daily precipitation	30.0 mm (1.2 in)	31 of 100 (Routine)
Usina Mauricio	Brazil	Record daily precipitation	27.4 mm (1.1 in)	31 of 100 (Routine)
Sape	Brazil	Record daily precipitation	36.1 mm (1.4 in)	31 of 100 (Routine)

Counts by Type and Timescale

717 records

Records set or tied on 18 May 1984 by type: Highest daily maximum 73, Lowest daily maximum 94, Highest daily minimum 120, Lowest daily minimum 149, Heaviest daily rainfall 280, Deepest snow cover 1.

Records on 18 May 1984 by type
Record type	Records
Highest daily maximum	73
Lowest daily maximum	94
Highest daily minimum	120
Lowest daily minimum	149
Heaviest daily rainfall	280
Heaviest daily snowfall	0
Deepest snow cover	1

Records on 18 May 1984 by timescale: all-time 0, monthly 16, daily 701.

How Much Records Were Beaten By

587 broken records

Margins by which the 587 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 203.0. Ties are not counted.

Top 20 by Significance

18 May 1984

Top 20 records on 18 May 1984 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 May 1984	Melrose, US	daily rain	46.0 mm (1.8 in)	36.9 mm (1.5 in)	70 years	64 of 100 (Major)
18 May 1984	Clovis, US	daily rain	62.5 mm (2.5 in)	31.5 mm (1.2 in)	70 years	55 of 100 (Notable)
18 May 1984	Chestnut Hill, US	monthly low min	-6.1 C (21.0 F)	3.9 C (7.0 F)	89 years	54 of 100 (Notable)
18 May 1984	Mairipora, BR	daily rain	65.4 mm (2.6 in)	57.4 mm (2.3 in)	29 years	52 of 100 (Notable)
18 May 1984	Pedregulho, BR	daily rain	63.1 mm (2.5 in)	58.7 mm (2.3 in)	19 years	49 of 100 (Notable)
18 May 1984	Candelaria, US	daily rain	31.5 mm (1.2 in)	25.7 mm (1.0 in)	43 years	48 of 100 (Notable)
18 May 1984	Glen-Ayle, AU	daily rain	50.0 mm (2.0 in)	46.4 mm (1.8 in)	15 years	47 of 100 (Notable)
18 May 1984	Heyuan, CN	daily rain	186.0 mm (7.3 in)	93.7 mm (3.7 in)	25 years	47 of 100 (Notable)
18 May 1984	Nice, FR	daily rain	44.0 mm (1.7 in)	33.0 mm (1.3 in)	34 years	47 of 100 (Notable)
18 May 1984	Qinzhou, CN	daily rain	130.2 mm (5.1 in)	89.3 mm (3.5 in)	12 years	46 of 100 (Notable)
18 May 1984	Igarapava, BR	daily rain	56.7 mm (2.2 in)	54.3 mm (2.1 in)	4 years	45 of 100 (Notable)
18 May 1984	Ituverava, BR	daily rain	70.9 mm (2.8 in)	40.2 mm (1.6 in)	33 years	45 of 100 (Notable)
18 May 1984	Manati 2 E, PR	daily high min	24.4 C (75.9 F)	2.2 C (4.0 F)	69 years	45 of 100 (Notable)
18 May 1984	Caninde, BR	daily rain	35.5 mm (1.4 in)	34.0 mm (1.3 in)	39 years	44 of 100 (Notable)
18 May 1984	Sao Jose Dos Campos, BR	daily rain	43.6 mm (1.7 in)	22.8 mm (0.9 in)	36 years	44 of 100 (Notable)
18 May 1984	Pte de Chassiron, FR	daily rain	32.6 mm (1.3 in)	15.0 mm (0.6 in)	24 years	43 of 100 (Notable)
18 May 1984	Brunswick, US	daily low min	10.6 C (51.1 F)	3.3 C (5.9 F)	77 years	43 of 100 (Notable)
18 May 1984	Jeriquara, BR	daily rain	60.2 mm (2.4 in)	46.0 mm (1.8 in)	24 years	42 of 100 (Notable)
18 May 1984	Coronel Macedo, BR	daily rain	79.1 mm (3.1 in)	44.8 mm (1.8 in)	30 years	42 of 100 (Notable)
18 May 1984	Federal Post Office, AU	daily rain	61.0 mm (2.4 in)	24.2 mm (1.0 in)	76 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

1796 to 1984

Records set or tied on this calendar date in each year from 1796 to 1984. 1984 had 717 records.

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

Records on 05-18 in each year
Year	Records
1796	1
1798	1
1802	2
1832	1
1833	1
1845	1
1847	1
1848	1
1855	1
1859	1
1861	2
1863	3
1864	1
1866	2
1868	2
1869	1
1870	1
1871	2
1872	1
1874	2
1877	4
1878	1
1879	1
1881	1
1883	2
1884	2
1885	1
1887	1
1888	4
1889	2
1891	1
1893	2
1894	4
1895	5
1896	2
1897	2
1898	1
1899	1
1900	13
1901	6
1902	9
1903	7
1904	11
1905	2
1906	24
1907	18
1908	5
1909	12
1910	50
1911	64
1912	5
1913	11
1914	45
1915	55
1916	74
1917	30
1918	42
1919	30
1920	26
1921	41
1922	33
1923	61
1924	92
1925	220
1926	133
1927	180
1928	160
1929	193
1930	475
1931	191
1932	460
1933	380
1934	390
1935	400
1936	282
1937	348
1938	382
1939	169
1940	315
1941	334
1942	421
1943	744
1944	496
1945	706
1946	651
1947	231
1948	426
1949	597
1950	473
1951	279
1952	493
1953	393
1954	498
1955	848
1956	795
1957	595
1958	334
1959	435
1960	404
1961	187
1962	1,199
1963	477
1964	329
1965	345
1966	438
1967	410
1968	817
1969	865
1970	703
1971	666
1972	499
1973	1,233
1974	1,097
1975	383
1976	733
1977	1,126
1978	1,090
1979	399
1980	614
1981	1,218
1982	452
1983	1,093
1984	717
1985	498
1986	1,131
1987	823
1988	1,154
1989	721
1990	753
1991	1,218
1992	921
1993	707
1994	1,015
1995	1,849
1996	1,767
1997	1,115
1998	1,060
1999	584
2000	922
2001	898
2002	1,833
2003	1,270
2004	847
2005	630
2006	1,493
2007	1,133
2008	999
2009	1,368
2010	894
2011	1,406
2012	523
2013	816
2014	609
2015	785
2016	597
2017	1,855
2018	557
2019	810
2020	706
2021	418
2022	711
2023	554
2024	551
2025	619
2026	1,131

Download the Data

Data for records on 1984-05-18: 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	579
50 to 100	6
100 to 150	1
150 to 200	0
200 to 250	1