Weather Records on 18 August 1984

600 weather records were set or tied worldwide on 18 August 1984. Highest significance: Bailey, US.

Key Facts for 18 August 1984

On 18 August 1984, 600 weather records were set or tied at long-record stations worldwide.
174 were record highs and 150 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 11 monthly and 588 daily.
Bailey set a daily record precipitation of 40.6 mm (1.6 in) on 18 August 1984.
Across 171 earlier years (1797 to 2026) the same calendar date averaged 440 records.

Record Map

600 stations

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

Weather records on 18 August 1984: highest significance records shown on the map
Station	Country	Type	Value	Significance
Bailey	United States	Record daily precipitation	40.6 mm (1.6 in)	59 of 100 (Notable)
Marquette	United States	Record daily precipitation	33.8 mm (1.3 in)	57 of 100 (Notable)
Washington Is	United States	Record daily precipitation	68.6 mm (2.7 in)	53 of 100 (Notable)
Rodovia Anchieta-Cota 400	Brazil	Record daily precipitation	65.2 mm (2.6 in)	51 of 100 (Notable)
Fort Drum	United States	Record daily precipitation	99.3 mm (3.9 in)	51 of 100 (Notable)
Panguitch	United States	Record daily precipitation	47.5 mm (1.9 in)	51 of 100 (Notable)
Kasilof 3 NW	United States	Record daily precipitation	50.8 mm (2.0 in)	48 of 100 (Notable)
Gest Lock 3	United States	Record daily precipitation	48.8 mm (1.9 in)	45 of 100 (Notable)
El Sauz	Mexico	Record daily precipitation	47.8 mm (1.9 in)	44 of 100 (Notable)
New Iberia AP - Acadiana Rgnl	United States	Record daily precipitation	38.1 mm (1.5 in)	44 of 100 (Notable)
Usina Rio Dos Campos	Brazil	Record daily precipitation	130.0 mm (5.1 in)	42 of 100 (Notable)
Homer AP	United States	Record daily precipitation	35.8 mm (1.4 in)	42 of 100 (Notable)
Jabalpur	India	Record daily precipitation	159.0 mm (6.3 in)	40 of 100 (Notable)
D'Java	Georgia	Record daily precipitation	58.0 mm (2.3 in)	39 of 100 (Notable)
Ajo	United States	Record daily precipitation	45.2 mm (1.8 in)	39 of 100 (Notable)
Cedar City AP	United States	Record daily precipitation	25.9 mm (1.0 in)	39 of 100 (Notable)
Nord-Solvaer	Norway	Record daily precipitation	37.4 mm (1.5 in)	38 of 100 (Notable)
Casa Grande	United States	Record daily precipitation	35.6 mm (1.4 in)	38 of 100 (Notable)
Portsmouth-Sciotoville	United States	Record daily precipitation	50.8 mm (2.0 in)	38 of 100 (Notable)
Seward AP	United States	Record daily precipitation	74.2 mm (2.9 in)	38 of 100 (Notable)
Armagh	United Kingdom	Record high minimum temperature	16.1 C (61.0 F)	37 of 100 (Notable)
Nord-Rana	Norway	Record daily precipitation	34.7 mm (1.4 in)	36 of 100 (Notable)
Bor	Russia	Record daily precipitation	29.4 mm (1.2 in)	36 of 100 (Notable)
Organ Pipe Cactus Nm	United States	Record daily precipitation	36.6 mm (1.4 in)	36 of 100 (Notable)
Louisa 2 S	United States	Record daily precipitation	47.0 mm (1.9 in)	36 of 100 (Notable)
Rock 1 E	United States	Record daily precipitation	33.5 mm (1.3 in)	36 of 100 (Notable)
San Felipe	Mexico	Record daily precipitation	25.9 mm (1.0 in)	34 of 100 (Routine)
Drevja	Norway	Record daily precipitation	45.2 mm (1.8 in)	34 of 100 (Routine)
Krakmo	Norway	Record daily precipitation	43.0 mm (1.7 in)	34 of 100 (Routine)
Tucson WFO	United States	Record low maximum temperature	29.4 C (84.9 F)	34 of 100 (Routine)
Paonia 1SW	United States	Record high maximum temperature	35.0 C (95.0 F)	34 of 100 (Routine)
Sandpoint Exp STN	United States	Record high minimum temperature	20.0 C (68.0 F)	34 of 100 (Routine)
Volborg	United States	Record daily precipitation	27.9 mm (1.1 in)	34 of 100 (Routine)
Northdown (Hamley)	Australia	Record daily precipitation	34.0 mm (1.3 in)	33 of 100 (Routine)
Harwell	Australia	Record daily precipitation	28.6 mm (1.1 in)	33 of 100 (Routine)
Chohataury	Georgia	Record daily precipitation	39.2 mm (1.5 in)	33 of 100 (Routine)
San Pedro Chenalho (Smn)	Mexico	Record daily precipitation	58.2 mm (2.3 in)	33 of 100 (Routine)
Glomfjord	Norway	Record daily precipitation	46.7 mm (1.8 in)	33 of 100 (Routine)
Fremont 5 NW	United States	Record low minimum temperature	-8.3 C (17.1 F)	33 of 100 (Routine)
Logan	United States	Record daily precipitation	40.1 mm (1.6 in)	33 of 100 (Routine)
Williamstown (Glen Gillian)	Australia	Record daily precipitation	27.4 mm (1.1 in)	32 of 100 (Routine)
Schierke	Germany	Record low minimum temperature	3.2 C (37.8 F)	32 of 100 (Routine)
San Sebastian del Oeste	Mexico	Record low minimum temperature	8.9 C (48.0 F)	32 of 100 (Routine)
Elliott Research Station	Australia	Record daily precipitation	31.0 mm (1.2 in)	31 of 100 (Routine)
Naracoopa	Australia	Record daily precipitation	32.6 mm (1.3 in)	31 of 100 (Routine)
Maxwell 3 NW	United States	Record daily precipitation	51.1 mm (2.0 in)	31 of 100 (Routine)
Harding 3 SE	United States	Record daily precipitation	39.6 mm (1.6 in)	31 of 100 (Routine)
Evansville Rgnl AP	United States	Record daily precipitation	47.8 mm (1.9 in)	31 of 100 (Routine)
Machiques-Granja M.A.C.	Venezuela	Record daily precipitation	63.1 mm (2.5 in)	31 of 100 (Routine)
Sumidouro-Usina Sao Jorge	Brazil	Record daily precipitation	49.8 mm (2.0 in)	30 of 100 (Routine)
Belleville Siu Rsch	United States	Record daily precipitation	50.8 mm (2.0 in)	30 of 100 (Routine)
Turgaj	Kazakhstan	Record high minimum temperature	19.5 C (67.1 F)	29 of 100 (Routine)
Venustiano Carranza	Mexico	Record daily precipitation	79.8 mm (3.1 in)	28 of 100 (Routine)
Jaral de Berrios	Mexico	Record daily precipitation	34.8 mm (1.4 in)	28 of 100 (Routine)
Nercinsk	Russia	Record daily precipitation	29.9 mm (1.2 in)	28 of 100 (Routine)
Archerton	Australia	Record daily precipitation	42.2 mm (1.7 in)	27 of 100 (Routine)
Caduao	Mexico	Record daily precipitation	60.5 mm (2.4 in)	27 of 100 (Routine)
San Sebastian del Oeste	Mexico	Record high maximum temperature	34.4 C (93.9 F)	27 of 100 (Routine)
Tuzantla (Smn)	Mexico	Record low minimum temperature	16.1 C (61.0 F)	27 of 100 (Routine)
Tatarsk	Russia	Record high minimum temperature	17.4 C (63.3 F)	27 of 100 (Routine)

Counts by Type and Timescale

600 records

Records set or tied on 18 August 1984 by type: Highest daily maximum 84, Lowest daily maximum 52, Highest daily minimum 90, Lowest daily minimum 98, Heaviest daily rainfall 276.

Records on 18 August 1984 by type
Record type	Records
Highest daily maximum	84
Lowest daily maximum	52
Highest daily minimum	90
Lowest daily minimum	98
Heaviest daily rainfall	276
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 18 August 1984 by timescale: all-time 1, monthly 11, daily 588.

How Much Records Were Beaten By

477 broken records

Margins by which the 477 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 69.6. Ties are not counted.

Top 20 by Significance

18 August 1984

Top 20 records on 18 August 1984 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 August 1984	Bailey, US	daily rain	40.6 mm (1.6 in)	30.4 mm (1.2 in)	37 years	59 of 100 (Notable)
18 August 1984	Marquette, US	daily rain	33.8 mm (1.3 in)	16.0 mm (0.6 in)	107 years	57 of 100 (Notable)
18 August 1984	Washington Is, US	daily rain	68.6 mm (2.7 in)	65.8 mm (2.6 in)	33 years	53 of 100 (Notable)
18 August 1984	Rodovia Anchieta-Cota 400, BR	daily rain	65.2 mm (2.6 in)	56.3 mm (2.2 in)	27 years	51 of 100 (Notable)
18 August 1984	Fort Drum, US	daily rain	99.3 mm (3.9 in)	69.6 mm (2.7 in)	27 years	51 of 100 (Notable)
18 August 1984	Panguitch, US	monthly rain	47.5 mm (1.9 in)	9.4 mm (0.37 in)	61 years	51 of 100 (Notable)
18 August 1984	Kasilof 3 NW, US	monthly rain	50.8 mm (2.0 in)	11.9 mm (0.5 in)	39 years	48 of 100 (Notable)
18 August 1984	Gest Lock 3, US	daily rain	48.8 mm (1.9 in)	28.5 mm (1.1 in)	58 years	45 of 100 (Notable)
18 August 1984	El Sauz, MX	daily rain	47.8 mm (1.9 in)	30.8 mm (1.2 in)	12 years	44 of 100 (Notable)
18 August 1984	New Iberia AP - Acadiana Rgnl, US	daily rain	38.1 mm (1.5 in)	16.5 mm (0.6 in)	86 years	44 of 100 (Notable)
18 August 1984	Usina Rio Dos Campos, BR	monthly rain	130.0 mm (5.1 in)	36.2 mm (1.4 in)	12 years	42 of 100 (Notable)
18 August 1984	Homer AP, US	daily rain	35.8 mm (1.4 in)	19.3 mm (0.8 in)	18 years	42 of 100 (Notable)
18 August 1984	Jabalpur, IN	daily rain	159.0 mm (6.3 in)	54.9 mm (2.2 in)	43 years	40 of 100 (Notable)
18 August 1984	D'Java, GE	daily rain	58.0 mm (2.3 in)	32.2 mm (1.3 in)	6 years	39 of 100 (Notable)
18 August 1984	Ajo, US	daily rain	45.2 mm (1.8 in)	35.8 mm (1.4 in)	5 years	39 of 100 (Notable)
18 August 1984	Cedar City AP, US	daily rain	25.9 mm (1.0 in)	18.0 mm (0.7 in)	27 years	39 of 100 (Notable)
18 August 1984	Nord-Solvaer, NO	daily rain	37.4 mm (1.5 in)	18.5 mm (0.7 in)	25 years	38 of 100 (Notable)
18 August 1984	Casa Grande, US	daily rain	35.6 mm (1.4 in)	24.9 mm (1.0 in)	33 years	38 of 100 (Notable)
18 August 1984	Portsmouth-Sciotoville, US	daily rain	50.8 mm (2.0 in)	15.7 mm (0.6 in)	58 years	38 of 100 (Notable)
18 August 1984	Seward AP, US	daily rain	74.2 mm (2.9 in)	22.6 mm (0.9 in)	44 years	38 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

1797 to 1984

Records set or tied on this calendar date in each year from 1797 to 1984. 1984 had 600 records.

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

Records on 08-18 in each year
Year	Records
1797	2
1805	1
1816	1
1827	1
1829	1
1830	1
1833	1
1841	1
1844	1
1845	3
1846	1
1847	1
1849	1
1851	1
1852	1
1853	1
1854	2
1855	1
1856	1
1861	1
1864	2
1866	1
1868	2
1869	1
1870	2
1872	1
1873	1
1875	3
1876	1
1878	1
1879	2
1883	3
1885	3
1886	3
1887	3
1888	2
1889	1
1890	1
1891	2
1892	6
1893	4
1894	4
1895	1
1898	4
1899	6
1900	2
1901	10
1902	8
1903	6
1904	8
1905	10
1906	40
1907	7
1908	21
1909	24
1910	16
1911	11
1912	21
1913	43
1914	37
1915	60
1916	71
1917	70
1918	53
1919	34
1920	51
1921	39
1922	129
1923	90
1924	225
1925	300
1926	168
1927	269
1928	141
1929	181
1930	150
1931	241
1932	382
1933	431
1934	638
1935	424
1936	766
1937	308
1938	243
1939	381
1940	434
1941	467
1942	333
1943	738
1944	325
1945	400
1946	416
1947	958
1948	315
1949	393
1950	683
1951	355
1952	405
1953	323
1954	622
1955	795
1956	580
1957	380
1958	580
1959	537
1960	599
1961	415
1962	428
1963	760
1964	443
1965	525
1966	573
1967	623
1968	795
1969	530
1970	597
1971	381
1972	493
1973	734
1974	639
1975	844
1976	917
1977	1,112
1978	854
1979	1,309
1980	771
1981	1,386
1982	563
1983	1,420
1984	600
1985	765
1986	861
1987	1,609
1988	1,351
1989	952
1990	920
1991	533
1992	1,497
1993	706
1994	1,027
1995	1,882
1996	760
1997	1,191
1998	923
1999	888
2000	1,183
2001	1,036
2002	1,306
2003	860
2004	1,050
2005	865
2006	842
2007	1,116
2008	1,265
2009	839
2010	1,167
2011	1,239
2012	1,247
2013	752
2014	751
2015	880
2016	704
2017	565
2018	462
2019	615
2020	1,541
2021	1,118
2022	1,237
2023	1,094
2024	696
2025	455
2026	545

Download the Data

Data for records on 1984-08-18: 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	399
10 to 20	45
20 to 30	19
30 to 40	9
40 to 50	1
50 to 60	2
60 to 70	2