Weather Records on 18 August 1978

854 weather records were set or tied worldwide on 18 August 1978. Highest significance: Shelbyville Sewage Plt, US.

Key Facts for 18 August 1978

On 18 August 1978, 854 weather records were set or tied at long-record stations worldwide.
222 were record highs and 379 were record lows, counting maximum and minimum temperature.
By timescale, 3 were all-time records, 29 monthly and 822 daily.
Shelbyville Sewage Plt set a daily record precipitation of 78.7 mm (3.1 in) on 18 August 1978.
Across 171 earlier years (1797 to 2026) the same calendar date averaged 439 records.

Record Map

854 stations

854 station records on 18 August 1978 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 August 1978: highest significance records shown on the map
Station	Country	Type	Value	Significance
Shelbyville Sewage Plt	United States	Record daily precipitation	78.7 mm (3.1 in)	59 of 100 (Notable)
Union Grove Wwtp	United States	Record daily precipitation	136.4 mm (5.4 in)	58 of 100 (Notable)
Fond du Lac Wwtp	United States	Record daily precipitation	145.8 mm (5.7 in)	53 of 100 (Notable)
Goomarin	Australia	Record daily precipitation	26.8 mm (1.1 in)	49 of 100 (Notable)
Shawano 2SSW	United States	Record daily precipitation	48.0 mm (1.9 in)	49 of 100 (Notable)
Biskra	Algeria	Record low maximum temperature	32.0 C (89.6 F)	47 of 100 (Notable)
Usugli	Russia	Record daily precipitation	50.3 mm (2.0 in)	47 of 100 (Notable)
Auburn 2 SSE	United States	Record daily precipitation	56.4 mm (2.2 in)	47 of 100 (Notable)
Watheroo	Australia	Record daily precipitation	41.6 mm (1.6 in)	46 of 100 (Notable)
Churchill A	Canada	Record daily precipitation	46.6 mm (1.8 in)	45 of 100 (Notable)
Teberda	Russia	Record daily precipitation	41.0 mm (1.6 in)	44 of 100 (Notable)
Ft Ross	United States	Record low minimum temperature	4.4 C (39.9 F)	44 of 100 (Notable)
Ulysses 3NE	United States	Record high maximum temperature	42.8 C (109.0 F)	43 of 100 (Notable)
Bremen-Seefahrtschule	Germany	Record low minimum temperature	5.5 C (41.9 F)	42 of 100 (Notable)
Vanrhysdorp	South Africa	Record daily precipitation	28.0 mm (1.1 in)	42 of 100 (Notable)
N Vernon 2 ESE	United States	Record daily precipitation	67.6 mm (2.7 in)	42 of 100 (Notable)
McGill	United States	Record low minimum temperature	2.8 C (37.0 F)	42 of 100 (Notable)
Manubie (Bos)	South Africa	Record daily precipitation	97.0 mm (3.8 in)	41 of 100 (Notable)
Walden	United States	Record low maximum temperature	12.2 C (54.0 F)	41 of 100 (Notable)
Port Washington	United States	Record daily precipitation	69.3 mm (2.7 in)	41 of 100 (Notable)
Worland	United States	Record low maximum temperature	16.7 C (62.1 F)	41 of 100 (Notable)
Kassler	United States	Record low maximum temperature	16.7 C (62.1 F)	40 of 100 (Notable)
St Andrews	Canada	Record high maximum temperature	31.0 C (87.8 F)	39 of 100 (Notable)
Riga	Latvia	Record daily precipitation	31.9 mm (1.3 in)	39 of 100 (Notable)
Greenfield	United States	Record daily precipitation	73.2 mm (2.9 in)	39 of 100 (Notable)
Carlsbad	United States	Record high minimum temperature	25.0 C (77.0 F)	39 of 100 (Notable)
Brisbane Regional Office	Australia	Record low maximum temperature	15.4 C (59.7 F)	38 of 100 (Notable)
Svobodnyj	Russia	Record daily precipitation	63.6 mm (2.5 in)	38 of 100 (Notable)
Erofej Pavlovic	Russia	Record daily precipitation	41.0 mm (1.6 in)	37 of 100 (Notable)
Rangely 1E	United States	Record low maximum temperature	22.8 C (73.0 F)	37 of 100 (Notable)
Neosho	United States	Record high minimum temperature	26.7 C (80.1 F)	37 of 100 (Notable)
Gunnedah Pool	Australia	Record low maximum temperature	8.9 C (48.0 F)	36 of 100 (Notable)
Sandheads	India	Record daily precipitation	89.9 mm (3.5 in)	36 of 100 (Notable)
Logan Utah St UNIV	United States	Record low minimum temperature	5.6 C (42.1 F)	36 of 100 (Notable)
Parnu	Estonia	Record daily precipitation	32.3 mm (1.3 in)	35 of 100 (Notable)
Fruita	United States	Record low maximum temperature	25.0 C (77.0 F)	35 of 100 (Notable)
Carrollton Lock 1	United States	Record daily precipitation	57.2 mm (2.3 in)	35 of 100 (Notable)
El Reno 1 N	United States	Record high minimum temperature	26.1 C (79.0 F)	35 of 100 (Notable)
Wheatland 4N	United States	Record low maximum temperature	19.4 C (66.9 F)	35 of 100 (Notable)
Santa Fe del Rio	Mexico	Record low maximum temperature	20.6 C (69.1 F)	34 of 100 (Routine)
Byssa	Russia	Record daily precipitation	62.4 mm (2.5 in)	34 of 100 (Routine)
Cedarville	United States	Record low minimum temperature	1.7 C (35.1 F)	34 of 100 (Routine)
Arrowrock Dam	United States	Record low minimum temperature	3.9 C (39.0 F)	34 of 100 (Routine)
Carson City	United States	Record low minimum temperature	1.7 C (35.1 F)	34 of 100 (Routine)
Wells	United States	Record low minimum temperature	-5.6 C (21.9 F)	34 of 100 (Routine)
Crosbyton	United States	Record high maximum temperature	40.0 C (104.0 F)	34 of 100 (Routine)
Bonanza	United States	Record low maximum temperature	22.2 C (72.0 F)	34 of 100 (Routine)
Snowville	United States	Record low minimum temperature	-2.8 C (27.0 F)	34 of 100 (Routine)
Inverell Comparison	Australia	Record low maximum temperature	8.5 C (47.3 F)	33 of 100 (Routine)
Ambrolauri	Georgia	Record daily precipitation	59.4 mm (2.3 in)	33 of 100 (Routine)
Cambridge	United States	Record low minimum temperature	1.7 C (35.1 F)	33 of 100 (Routine)
Greeley	United States	Record low minimum temperature	8.3 C (46.9 F)	33 of 100 (Routine)
Elk	United States	Record high minimum temperature	17.2 C (63.0 F)	33 of 100 (Routine)
Uil	Kazakhstan	Record low minimum temperature	7.3 C (45.1 F)	32 of 100 (Routine)
Dos Bocas	Puerto Rico [United States]	Record low minimum temperature	17.2 C (63.0 F)	32 of 100 (Routine)
Grand View 4 NW	United States	Record low minimum temperature	3.3 C (37.9 F)	32 of 100 (Routine)
Hartford City 4 ESE	United States	Record daily precipitation	98.3 mm (3.9 in)	32 of 100 (Routine)
Snowville	United States	Record low maximum temperature	21.7 C (71.1 F)	32 of 100 (Routine)
Bridgeport	United States	Record low minimum temperature	-4.4 C (24.1 F)	31 of 100 (Routine)
Kit Carson	United States	Record low minimum temperature	5.6 C (42.1 F)	31 of 100 (Routine)

Counts by Type and Timescale

854 records

Records set or tied on 18 August 1978 by type: Highest daily maximum 90, Lowest daily maximum 157, Highest daily minimum 132, Lowest daily minimum 222, Heaviest daily rainfall 253.

Records on 18 August 1978 by type
Record type	Records
Highest daily maximum	90
Lowest daily maximum	157
Highest daily minimum	132
Lowest daily minimum	222
Heaviest daily rainfall	253
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 18 August 1978 by timescale: all-time 3, monthly 29, daily 822.

How Much Records Were Beaten By

692 broken records

Margins by which the 692 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 69.1. Ties are not counted.

Top 20 by Significance

18 August 1978

Top 20 records on 18 August 1978 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 August 1978	Shelbyville Sewage Plt, US	daily rain	78.7 mm (3.1 in)	52.8 mm (2.1 in)	37 years	59 of 100 (Notable)
18 August 1978	Union Grove Wwtp, US	all-time rain	136.4 mm (5.4 in)	34.8 mm (1.4 in)	20 years	58 of 100 (Notable)
18 August 1978	Fond du Lac Wwtp, US	all-time rain	145.8 mm (5.7 in)	11.2 mm (0.4 in)	54 years	53 of 100 (Notable)
18 August 1978	Goomarin, AU	daily rain	26.8 mm (1.1 in)	19.4 mm (0.8 in)	23 years	49 of 100 (Notable)
18 August 1978	Shawano 2SSW, US	daily rain	48.0 mm (1.9 in)	33.0 mm (1.3 in)	53 years	49 of 100 (Notable)
18 August 1978	Biskra, DZ	daily low max	32.0 C (89.6 F)	4.0 C (7.2 F)	85 years	47 of 100 (Notable)
18 August 1978	Usugli, RU	daily rain	50.3 mm (2.0 in)	35.1 mm (1.4 in)	11 years	47 of 100 (Notable)
18 August 1978	Auburn 2 SSE, US	daily rain	56.4 mm (2.2 in)	23.9 mm (0.9 in)	72 years	47 of 100 (Notable)
18 August 1978	Watheroo, AU	monthly rain	41.6 mm (1.6 in)	6.8 mm (0.27 in)	54 years	46 of 100 (Notable)
18 August 1978	Churchill A, CA	daily rain	46.6 mm (1.8 in)	33.6 mm (1.3 in)	7 years	45 of 100 (Notable)
18 August 1978	Teberda, RU	daily rain	41.0 mm (1.6 in)	34.8 mm (1.4 in)	0 years	44 of 100 (Notable)
18 August 1978	Ft Ross, US	monthly low min	4.4 C (39.9 F)	0.6 C (1.1 F)	77 years	44 of 100 (Notable)
18 August 1978	Ulysses 3NE, US	monthly high max	42.8 C (109.0 F)	0.6 C (1.1 F)	82 years	43 of 100 (Notable)
18 August 1978	Bremen-Seefahrtschule, DE	daily low min	5.5 C (41.9 F)	2.4 C (4.3 F)	83 years	42 of 100 (Notable)
18 August 1978	Vanrhysdorp, ZA	monthly rain	28.0 mm (1.1 in)	8.0 mm (0.31 in)	3 years	42 of 100 (Notable)
18 August 1978	N Vernon 2 ESE, US	daily rain	67.6 mm (2.7 in)	37.1 mm (1.5 in)	28 years	42 of 100 (Notable)
18 August 1978	McGill, US	daily low min	2.8 C (37.0 F)	3.3 C (5.9 F)	83 years	42 of 100 (Notable)
18 August 1978	Manubie (Bos), ZA	daily rain	97.0 mm (3.8 in)	69.1 mm (2.7 in)	31 years	41 of 100 (Notable)
18 August 1978	Walden, US	daily low max	12.2 C (54.0 F)	6.7 C (12.1 F)	36 years	41 of 100 (Notable)
18 August 1978	Port Washington, US	daily rain	69.3 mm (2.7 in)	24.8 mm (1.0 in)	44 years	41 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 1978

Records set or tied on this calendar date in each year from 1797 to 1978. 1978 had 854 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 1978-08-18: 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	632
10 to 20	36
20 to 30	10
30 to 40	12
40 to 50	0
50 to 60	1
60 to 70	1