Weather Records on 20 July 1978

663 weather records were set or tied worldwide on 20 July 1978. Highest significance: Jaicos, BR.

Key Facts for 20 July 1978

On 20 July 1978, 663 weather records were set or tied at long-record stations worldwide.
247 were record highs and 174 were record lows, counting maximum and minimum temperature.
By timescale, 3 were all-time records, 17 monthly and 643 daily.
Jaicos set a monthly record daily precipitation of 94.0 mm (3.7 in) on 20 July 1978.
Across 161 earlier years (1809 to 2026) the same calendar date averaged 458 records.

Record Map

663 stations

663 station records on 20 July 1978 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 July 1978: highest significance records shown on the map
Station	Country	Type	Value	Significance
Jaicos	Brazil	Record daily precipitation	94.0 mm (3.7 in)	75 of 100 (Major)
Chatham Exp Fa	United States	Record daily precipitation	108.0 mm (4.3 in)	70 of 100 (Major)
Oshkosh	United States	Record daily precipitation	86.1 mm (3.4 in)	52 of 100 (Notable)
Arcadia	United States	Record daily precipitation	44.7 mm (1.8 in)	49 of 100 (Notable)
Quata	Brazil	Record daily precipitation	59.5 mm (2.3 in)	48 of 100 (Notable)
Coloso	Puerto Rico [United States]	Record low maximum temperature	27.2 C (81.0 F)	48 of 100 (Notable)
Oeiras	Brazil	Record daily precipitation	28.8 mm (1.1 in)	46 of 100 (Notable)
Munising	United States	Record daily precipitation	57.4 mm (2.3 in)	41 of 100 (Notable)
Nova Trento	Brazil	Record daily precipitation	118.2 mm (4.7 in)	40 of 100 (Notable)
Tombstone	United States	Record high minimum temperature	22.8 C (73.0 F)	40 of 100 (Notable)
Usina Quatiara	Brazil	Record daily precipitation	41.0 mm (1.6 in)	39 of 100 (Notable)
Duncan	United States	Record high maximum temperature	41.1 C (106.0 F)	39 of 100 (Notable)
Rinopolis	Brazil	Record daily precipitation	34.9 mm (1.4 in)	38 of 100 (Notable)
Echapora	Brazil	Record daily precipitation	42.6 mm (1.7 in)	38 of 100 (Notable)
Ico	Brazil	Record daily precipitation	30.6 mm (1.2 in)	37 of 100 (Notable)
Vanersborg	Sweden	Record low maximum temperature	14.8 C (58.6 F)	37 of 100 (Notable)
Alton 1 W	United States	Record daily precipitation	40.1 mm (1.6 in)	37 of 100 (Notable)
Kenosha Wwtp	United States	Record daily precipitation	69.1 mm (2.7 in)	37 of 100 (Notable)
Sebewaing	United States	Record daily precipitation	45.7 mm (1.8 in)	36 of 100 (Notable)
Albion 1 N	United States	Record daily precipitation	33.8 mm (1.3 in)	36 of 100 (Notable)
Lake Geneva Wwtp	United States	Record daily precipitation	98.6 mm (3.9 in)	36 of 100 (Notable)
Monte Alto	Brazil	Record daily precipitation	27.0 mm (1.1 in)	35 of 100 (Notable)
Narandiba	Brazil	Record daily precipitation	34.8 mm (1.4 in)	35 of 100 (Notable)
Milbank 4 NW	United States	Record low minimum temperature	6.7 C (44.1 F)	35 of 100 (Notable)
Terang	Australia	Record daily precipitation	27.0 mm (1.1 in)	34 of 100 (Routine)
Alto Alegre	Brazil	Record daily precipitation	34.0 mm (1.3 in)	34 of 100 (Routine)
Presidente Prudente	Brazil	Record daily precipitation	42.8 mm (1.7 in)	34 of 100 (Routine)
Itapicuru	Brazil	Record daily precipitation	28.3 mm (1.1 in)	34 of 100 (Routine)
Orel	Russia	Record daily precipitation	25.8 mm (1.0 in)	34 of 100 (Routine)
Belle Plaine	United States	Record daily precipitation	27.7 mm (1.1 in)	34 of 100 (Routine)
Ballantine	United States	Record low maximum temperature	18.9 C (66.0 F)	34 of 100 (Routine)
Busby	United States	Record low maximum temperature	18.3 C (64.9 F)	33 of 100 (Routine)
Martim Francisco	Brazil	Record daily precipitation	31.0 mm (1.2 in)	32 of 100 (Routine)
Togul	Russia	Record daily precipitation	34.0 mm (1.3 in)	32 of 100 (Routine)
Willcox	United States	Record high minimum temperature	22.8 C (73.0 F)	32 of 100 (Routine)
Eureka	United States	Record low maximum temperature	20.6 C (69.1 F)	32 of 100 (Routine)
Aracatuba	Brazil	Record daily precipitation	73.5 mm (2.9 in)	31 of 100 (Routine)
Barao de Antonina	Brazil	Record daily precipitation	33.1 mm (1.3 in)	31 of 100 (Routine)
Iepe	Brazil	Record daily precipitation	49.1 mm (1.9 in)	30 of 100 (Routine)
Dequeen	United States	Record high maximum temperature	38.3 C (100.9 F)	30 of 100 (Routine)
Brawley 2 SW	United States	Record high maximum temperature	47.2 C (117.0 F)	30 of 100 (Routine)
Sacaton	United States	Record high maximum temperature	46.7 C (116.1 F)	29 of 100 (Routine)
Merrill	United States	Record daily precipitation	43.2 mm (1.7 in)	29 of 100 (Routine)
Saluda	United States	Record low minimum temperature	15.0 C (59.0 F)	29 of 100 (Routine)
Faith	United States	Record daily precipitation	39.4 mm (1.6 in)	29 of 100 (Routine)
Ribeirao Do Sul	Brazil	Record daily precipitation	37.8 mm (1.5 in)	28 of 100 (Routine)
Pompeia	Brazil	Record daily precipitation	29.9 mm (1.2 in)	28 of 100 (Routine)
Magdeburg	Germany	Record low maximum temperature	16.6 C (61.9 F)	28 of 100 (Routine)
Gagnoa	Cote D'Ivoire	Record low minimum temperature	16.2 C (61.2 F)	28 of 100 (Routine)
Kharkiv	Ukraine	Record daily precipitation	27.6 mm (1.1 in)	28 of 100 (Routine)
Coleman	United States	Record high minimum temperature	25.6 C (78.1 F)	28 of 100 (Routine)
Jataizinho Aneel/Cesp	Brazil	Record daily precipitation	52.0 mm (2.0 in)	27 of 100 (Routine)
Usina Tamoio (Bela Vista)	Brazil	Record daily precipitation	27.3 mm (1.1 in)	27 of 100 (Routine)
Sodrelia	Brazil	Record daily precipitation	33.2 mm (1.3 in)	27 of 100 (Routine)
Ibirarema	Brazil	Record daily precipitation	31.3 mm (1.2 in)	27 of 100 (Routine)
Oriente	Brazil	Record daily precipitation	32.5 mm (1.3 in)	27 of 100 (Routine)
Quintana	Brazil	Record daily precipitation	50.0 mm (2.0 in)	27 of 100 (Routine)
Bancroft	Canada	Record high minimum temperature	18.5 C (65.3 F)	27 of 100 (Routine)
Navojoa	Mexico	Record daily precipitation	38.6 mm (1.5 in)	27 of 100 (Routine)
Ajo	United States	Record high maximum temperature	44.4 C (111.9 F)	27 of 100 (Routine)

Counts by Type and Timescale

663 records

Records set or tied on 20 July 1978 by type: Highest daily maximum 127, Lowest daily maximum 121, Highest daily minimum 120, Lowest daily minimum 53, Heaviest daily rainfall 242.

Records on 20 July 1978 by type
Record type	Records
Highest daily maximum	127
Lowest daily maximum	121
Highest daily minimum	120
Lowest daily minimum	53
Heaviest daily rainfall	242
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 20 July 1978 by timescale: all-time 3, monthly 17, daily 643.

How Much Records Were Beaten By

507 broken records

Margins by which the 507 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 82.7. Ties are not counted.

Top 20 by Significance

20 July 1978

Top 20 records on 20 July 1978 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 July 1978	Jaicos, BR	monthly rain	94.0 mm (3.7 in)	82.7 mm (3.3 in)	63 years	75 of 100 (Major)
20 July 1978	Chatham Exp Fa, US	monthly rain	108.0 mm (4.3 in)	35.9 mm (1.4 in)	66 years	70 of 100 (Major)
20 July 1978	Oshkosh, US	daily rain	86.1 mm (3.4 in)	64.3 mm (2.5 in)	20 years	52 of 100 (Notable)
20 July 1978	Arcadia, US	daily rain	44.7 mm (1.8 in)	24.4 mm (1.0 in)	73 years	49 of 100 (Notable)
20 July 1978	Quata, BR	daily rain	59.5 mm (2.3 in)	53.5 mm (2.1 in)	16 years	48 of 100 (Notable)
20 July 1978	Coloso, PR	daily low max	27.2 C (81.0 F)	3.4 C (6.1 F)	21 years	48 of 100 (Notable)
20 July 1978	Oeiras, BR	monthly rain	28.8 mm (1.1 in)	11.3 mm (0.4 in)	63 years	46 of 100 (Notable)
20 July 1978	Munising, US	daily rain	57.4 mm (2.3 in)	24.9 mm (1.0 in)	37 years	41 of 100 (Notable)
20 July 1978	Nova Trento, BR	monthly rain	118.2 mm (4.7 in)	23.9 mm (0.9 in)	30 years	40 of 100 (Notable)
20 July 1978	Tombstone, US	daily high min	22.8 C (73.0 F)	2.2 C (4.0 F)	72 years	40 of 100 (Notable)
20 July 1978	Usina Quatiara, BR	daily rain	41.0 mm (1.6 in)	35.7 mm (1.4 in)	21 years	39 of 100 (Notable)
20 July 1978	Duncan, US	daily high max	41.1 C (106.0 F)	3.3 C (5.9 F)	72 years	39 of 100 (Notable)
20 July 1978	Rinopolis, BR	daily rain	34.9 mm (1.4 in)	34.9 mm (1.4 in)	32 years	38 of 100 (Notable)
20 July 1978	Echapora, BR	daily rain	42.6 mm (1.7 in)	39.6 mm (1.6 in)	24 years	38 of 100 (Notable)
20 July 1978	Ico, BR	monthly rain	30.6 mm (1.2 in)	7.6 mm (0.30 in)	5 years	37 of 100 (Notable)
20 July 1978	Vanersborg, SE	daily low max	14.8 C (58.6 F)	0.2 C (0.4 F)	93 years	37 of 100 (Notable)
20 July 1978	Alton 1 W, US	daily rain	40.1 mm (1.6 in)	20.5 mm (0.8 in)	52 years	37 of 100 (Notable)
20 July 1978	Kenosha Wwtp, US	daily rain	69.1 mm (2.7 in)	34.8 mm (1.4 in)	24 years	37 of 100 (Notable)
20 July 1978	Sebewaing, US	daily rain	45.7 mm (1.8 in)	30.5 mm (1.2 in)	15 years	36 of 100 (Notable)
20 July 1978	Albion 1 N, US	daily rain	33.8 mm (1.3 in)	18.8 mm (0.7 in)	32 years	36 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

1809 to 1978

Records set or tied on this calendar date in each year from 1809 to 1978. 1978 had 663 records.

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

Records on 07-20 in each year
Year	Records
1809	1
1810	1
1811	2
1832	2
1844	2
1850	1
1859	2
1863	1
1865	4
1866	1
1867	1
1868	1
1870	1
1872	1
1874	2
1876	1
1877	2
1879	3
1880	1
1881	2
1882	1
1883	2
1885	1
1886	2
1887	1
1888	1
1889	2
1890	5
1892	7
1893	1
1894	1
1895	1
1897	4
1898	2
1899	4
1900	9
1901	3
1902	13
1903	6
1904	10
1905	6
1906	8
1907	12
1908	31
1909	6
1910	27
1911	12
1912	33
1913	28
1914	20
1915	163
1916	117
1917	57
1918	53
1919	40
1920	16
1921	55
1922	52
1923	173
1924	112
1925	125
1926	411
1927	106
1928	366
1929	480
1930	598
1931	362
1932	338
1933	201
1934	857
1935	386
1936	358
1937	213
1938	392
1939	336
1940	325
1941	270
1942	609
1943	326
1944	470
1945	278
1946	482
1947	635
1948	385
1949	807
1950	563
1951	448
1952	488
1953	316
1954	512
1955	377
1956	545
1957	351
1958	536
1959	605
1960	758
1961	338
1962	327
1963	457
1964	416
1965	1,110
1966	469
1967	455
1968	389
1969	649
1970	890
1971	619
1972	1,062
1973	804
1974	489
1975	470
1976	580
1977	899
1978	663
1979	1,249
1980	925
1981	1,048
1982	580
1983	1,117
1984	799
1985	604
1986	848
1987	1,156
1988	1,103
1989	1,183
1990	724
1991	1,024
1992	1,137
1993	901
1994	611
1995	961
1996	1,365
1997	903
1998	1,682
1999	815
2000	1,393
2001	755
2002	986
2003	1,313
2004	978
2005	1,266
2006	1,487
2007	1,124
2008	663
2009	1,533
2010	1,154
2011	1,339
2012	817
2013	850
2014	1,000
2015	812
2016	744
2017	398
2018	930
2019	867
2020	524
2021	683
2022	1,108
2023	812
2024	737
2025	680
2026	863

Download the Data

Data for records on 1978-07-20: 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	468
20 to 40	36
40 to 60	1
60 to 80	1
80 to 100	1