Weather Records on 12 August 1978

571 weather records were set or tied worldwide on 12 August 1978. Highest significance: Hannah 2 N, US.

Key Facts for 12 August 1978

On 12 August 1978, 571 weather records were set or tied at long-record stations worldwide.
223 were record highs and 135 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 5 monthly and 566 daily.
Hannah 2 N set a daily record precipitation of 53.3 mm (2.1 in) on 12 August 1978.
Across 166 earlier years (1793 to 2026) the same calendar date averaged 447 records.

Record Map

571 stations

571 station records on 12 August 1978 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 12 August 1978: highest significance records shown on the map
Station	Country	Type	Value	Significance
Hannah 2 N	United States	Record daily precipitation	53.3 mm (2.1 in)	52 of 100 (Notable)
Paso del Cuarenta I	Mexico	Record daily precipitation	68.6 mm (2.7 in)	50 of 100 (Notable)
Melbourne WFO	United States	Record daily precipitation	93.0 mm (3.7 in)	44 of 100 (Notable)
Huntsdale	United States	Record daily precipitation	59.7 mm (2.4 in)	44 of 100 (Notable)
Searchlight	United States	Record daily precipitation	96.8 mm (3.8 in)	41 of 100 (Notable)
Strausstown	United States	Record daily precipitation	53.8 mm (2.1 in)	41 of 100 (Notable)
Mathias	United States	Record daily precipitation	58.9 mm (2.3 in)	41 of 100 (Notable)
Hanover	United States	Record daily precipitation	27.9 mm (1.1 in)	40 of 100 (Notable)
Moorefield 1 SSE	United States	Record daily precipitation	67.3 mm (2.6 in)	40 of 100 (Notable)
Indian Lake 2SW	United States	Record daily precipitation	42.7 mm (1.7 in)	37 of 100 (Notable)
Washburn	United States	Record high maximum temperature	40.0 C (104.0 F)	37 of 100 (Notable)
Emerson	Canada	Record daily precipitation	45.7 mm (1.8 in)	36 of 100 (Notable)
Alfred	United States	Record daily precipitation	33.3 mm (1.3 in)	36 of 100 (Notable)
Effingham	United States	Record daily precipitation	36.8 mm (1.4 in)	35 of 100 (Notable)
Elko Rgnl AP	United States	Record high minimum temperature	17.2 C (63.0 F)	35 of 100 (Notable)
Winnibigoshish Dam	United States	Record high minimum temperature	20.0 C (68.0 F)	34 of 100 (Routine)
Grafton	United States	Record low maximum temperature	17.2 C (63.0 F)	34 of 100 (Routine)
Melbourne Regional Office	Australia	Record low maximum temperature	9.6 C (49.3 F)	33 of 100 (Routine)
Bemidji	United States	Record high maximum temperature	33.9 C (93.0 F)	33 of 100 (Routine)
Lisbon	United States	Record high minimum temperature	22.2 C (72.0 F)	33 of 100 (Routine)
Olga 2 SE	United States	Record high minimum temperature	15.0 C (59.0 F)	33 of 100 (Routine)
Rio Dos Patos	Brazil	Record daily precipitation	43.2 mm (1.7 in)	32 of 100 (Routine)
Bemidji	United States	Record high minimum temperature	20.0 C (68.0 F)	32 of 100 (Routine)
Romney 1 SW	United States	Record daily precipitation	25.4 mm (1.0 in)	32 of 100 (Routine)
Franklin Sewage Plt	United States	Record daily precipitation	42.2 mm (1.7 in)	31 of 100 (Routine)
Elberta	United States	Record high minimum temperature	21.1 C (70.0 F)	31 of 100 (Routine)
Brownsville	United States	Record high minimum temperature	27.2 C (81.0 F)	31 of 100 (Routine)
Agartala	India	Record daily precipitation	110.0 mm (4.3 in)	30 of 100 (Routine)
Jakutsk	Russia	Record high minimum temperature	17.1 C (62.8 F)	30 of 100 (Routine)
Houston	United States	Record daily precipitation	36.6 mm (1.4 in)	30 of 100 (Routine)
Mohall	United States	Record high minimum temperature	18.9 C (66.0 F)	30 of 100 (Routine)
Joinville (Rvpsc)	Brazil	Record daily precipitation	50.9 mm (2.0 in)	29 of 100 (Routine)
Grimsby	Canada	Record low minimum temperature	9.0 C (48.2 F)	29 of 100 (Routine)
Fichtelberg	Germany	Record low maximum temperature	6.3 C (43.3 F)	29 of 100 (Routine)
Santa Maria (Dge)	Mexico	Record daily precipitation	47.2 mm (1.9 in)	29 of 100 (Routine)
Wytheville	United States	Record daily precipitation	50.3 mm (2.0 in)	29 of 100 (Routine)
Buzau	Romania	Record low minimum temperature	12.2 C (54.0 F)	28 of 100 (Routine)
Fruita	United States	Record high minimum temperature	19.4 C (66.9 F)	28 of 100 (Routine)
Dahlonega 4WSW	United States	Record daily precipitation	30.2 mm (1.2 in)	28 of 100 (Routine)
Kingman	United States	Record high maximum temperature	42.8 C (109.0 F)	28 of 100 (Routine)
Turtle Lake	United States	Record high maximum temperature	40.6 C (105.1 F)	28 of 100 (Routine)
Arrozeira	Brazil	Record daily precipitation	30.2 mm (1.2 in)	27 of 100 (Routine)
Oujda	Morocco	Record low maximum temperature	29.0 C (84.2 F)	27 of 100 (Routine)
Tg Jiu	Romania	Record low minimum temperature	9.1 C (48.4 F)	27 of 100 (Routine)
Tarko-Sale	Russia	Record daily precipitation	25.3 mm (1.0 in)	27 of 100 (Routine)
Lebanon	United States	Record daily precipitation	50.8 mm (2.0 in)	27 of 100 (Routine)
Enderby	Canada	Record high minimum temperature	13.9 C (57.0 F)	26 of 100 (Routine)
Ust-Hairyuzovo	Russia	Record daily precipitation	26.3 mm (1.0 in)	26 of 100 (Routine)
Baudette	United States	Record high maximum temperature	32.8 C (91.0 F)	26 of 100 (Routine)
Montevideo 1SW	United States	Record high maximum temperature	35.0 C (95.0 F)	26 of 100 (Routine)
Warroad	United States	Record high maximum temperature	33.9 C (93.0 F)	26 of 100 (Routine)
Mtn Grove 2 N	United States	Record daily precipitation	40.4 mm (1.6 in)	26 of 100 (Routine)
Jemez Springs	United States	Record low minimum temperature	9.4 C (48.9 F)	26 of 100 (Routine)
Edmore 4NW	United States	Record high maximum temperature	38.3 C (100.9 F)	26 of 100 (Routine)
Narracan East (Lynnsmere)	Australia	Record daily precipitation	28.8 mm (1.1 in)	25 of 100 (Routine)
Colonia Do Cachoeira	Brazil	Record daily precipitation	26.2 mm (1.0 in)	25 of 100 (Routine)
Foremost	Canada	Record daily precipitation	26.2 mm (1.0 in)	25 of 100 (Routine)
Itasca UNIV of Minn	United States	Record high maximum temperature	35.0 C (95.0 F)	25 of 100 (Routine)
Sedalia Wtp	United States	Record daily precipitation	50.8 mm (2.0 in)	25 of 100 (Routine)
Long Valley	United States	Record low maximum temperature	20.6 C (69.1 F)	25 of 100 (Routine)

Counts by Type and Timescale

571 records

Records set or tied on 12 August 1978 by type: Highest daily maximum 118, Lowest daily maximum 91, Highest daily minimum 105, Lowest daily minimum 44, Heaviest daily rainfall 213.

Records on 12 August 1978 by type
Record type	Records
Highest daily maximum	118
Lowest daily maximum	91
Highest daily minimum	105
Lowest daily minimum	44
Heaviest daily rainfall	213
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 12 August 1978 by timescale: all-time 0, monthly 5, daily 566.

How Much Records Were Beaten By

452 broken records

Margins by which the 452 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 80.3. Ties are not counted.

Top 20 by Significance

12 August 1978

Top 20 records on 12 August 1978 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
12 August 1978	Hannah 2 N, US	daily rain	53.3 mm (2.1 in)	30.4 mm (1.2 in)	69 years	52 of 100 (Notable)
12 August 1978	Paso del Cuarenta I, MX	daily rain	68.6 mm (2.7 in)	41.7 mm (1.6 in)	24 years	50 of 100 (Notable)
12 August 1978	Melbourne WFO, US	daily rain	93.0 mm (3.7 in)	80.3 mm (3.2 in)	3 years	44 of 100 (Notable)
12 August 1978	Huntsdale, US	daily rain	59.7 mm (2.4 in)	43.4 mm (1.7 in)	29 years	44 of 100 (Notable)
12 August 1978	Searchlight, US	monthly rain	96.8 mm (3.8 in)	13.0 mm (0.5 in)	46 years	41 of 100 (Notable)
12 August 1978	Strausstown, US	daily rain	53.8 mm (2.1 in)	41.6 mm (1.6 in)	29 years	41 of 100 (Notable)
12 August 1978	Mathias, US	daily rain	58.9 mm (2.3 in)	33.5 mm (1.3 in)	28 years	41 of 100 (Notable)
12 August 1978	Hanover, US	daily rain	27.9 mm (1.1 in)	7.8 mm (0.31 in)	82 years	40 of 100 (Notable)
12 August 1978	Moorefield 1 SSE, US	daily rain	67.3 mm (2.6 in)	24.1 mm (0.9 in)	36 years	40 of 100 (Notable)
12 August 1978	Indian Lake 2SW, US	daily rain	42.7 mm (1.7 in)	18.1 mm (0.7 in)	40 years	37 of 100 (Notable)
12 August 1978	Washburn, US	daily high max	40.0 C (104.0 F)	2.8 C (5.0 F)	80 years	37 of 100 (Notable)
12 August 1978	Emerson, CA	daily rain	45.7 mm (1.8 in)	20.8 mm (0.8 in)	24 years	36 of 100 (Notable)
12 August 1978	Alfred, US	daily rain	33.3 mm (1.3 in)	14.0 mm (0.6 in)	52 years	36 of 100 (Notable)
12 August 1978	Effingham, US	daily rain	36.8 mm (1.4 in)	7.6 mm (0.30 in)	76 years	35 of 100 (Notable)
12 August 1978	Elko Rgnl AP, US	daily high min	17.2 C (63.0 F)	0.5 C (0.9 F)	84 years	35 of 100 (Notable)
12 August 1978	Winnibigoshish Dam, US	daily high min	20.0 C (68.0 F)	1.1 C (2.0 F)	76 years	34 of 100 (Routine)
12 August 1978	Grafton, US	daily low max	17.2 C (63.0 F)	1.1 C (2.0 F)	82 years	34 of 100 (Routine)
12 August 1978	Melbourne Regional Office, AU	daily low max	9.6 C (49.3 F)	0.6 C (1.1 F)	72 years	33 of 100 (Routine)
12 August 1978	Bemidji, US	daily high max	33.9 C (93.0 F)	0.6 C (1.1 F)	81 years	33 of 100 (Routine)
12 August 1978	Lisbon, US	daily high min	22.2 C (72.0 F)	2.8 C (5.0 F)	68 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 1978

Records set or tied on this calendar date in each year from 1793 to 1978. 1978 had 571 records.

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

Records on 08-12 in each year
Year	Records
1793	1
1796	1
1811	2
1814	1
1815	1
1825	1
1843	1
1851	1
1854	1
1855	2
1856	1
1861	1
1864	3
1865	1
1867	1
1868	1
1871	2
1872	1
1873	1
1874	2
1875	3
1876	2
1879	1
1881	2
1883	1
1884	1
1885	1
1887	2
1888	2
1889	4
1890	4
1891	4
1892	2
1893	1
1894	1
1895	6
1896	2
1897	4
1898	1
1899	10
1900	1
1901	5
1902	9
1903	14
1904	13
1905	16
1906	8
1907	8
1908	31
1909	42
1910	16
1911	33
1912	40
1913	39
1914	26
1915	46
1916	31
1917	134
1918	37
1919	42
1920	26
1921	174
1922	71
1923	89
1924	267
1925	150
1926	154
1927	145
1928	173
1929	276
1930	501
1931	708
1932	418
1933	271
1934	471
1935	408
1936	591
1937	356
1938	237
1939	282
1940	545
1941	481
1942	257
1943	523
1944	595
1945	295
1946	655
1947	729
1948	384
1949	469
1950	442
1951	357
1952	533
1953	227
1954	969
1955	590
1956	265
1957	384
1958	406
1959	388
1960	707
1961	381
1962	466
1963	559
1964	1,346
1965	977
1966	777
1967	1,135
1968	444
1969	629
1970	422
1971	486
1972	473
1973	442
1974	560
1975	593
1976	495
1977	747
1978	571
1979	1,192
1980	692
1981	665
1982	789
1983	923
1984	665
1985	935
1986	615
1987	935
1988	1,518
1989	827
1990	727
1991	726
1992	1,134
1993	936
1994	861
1995	1,654
1996	1,336
1997	1,363
1998	1,215
1999	1,325
2000	741
2001	855
2002	1,345
2003	1,752
2004	1,872
2005	1,085
2006	874
2007	1,209
2008	970
2009	814
2010	1,907
2011	903
2012	910
2013	427
2014	787
2015	757
2016	1,290
2017	533
2018	571
2019	695
2020	730
2021	980
2022	616
2023	779
2024	659
2025	639
2026	849

Download the Data

Data for records on 1978-08-12: 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 20	435
20 to 40	13
40 to 60	3
60 to 80	0
80 to 100	1