Weather Records on 17 July 1978

794 weather records were set or tied worldwide on 17 July 1978. Highest significance: Grand Meadow, US.

Key Facts for 17 July 1978

On 17 July 1978, 794 weather records were set or tied at long-record stations worldwide.
279 were record highs and 255 were record lows, counting maximum and minimum temperature.
By timescale, 4 were all-time records, 11 monthly and 779 daily.
Grand Meadow set a daily record precipitation of 94.2 mm (3.7 in) on 17 July 1978.
Across 163 earlier years (1793 to 2026) the same calendar date averaged 443 records.

Record Map

794 stations

794 station records on 17 July 1978 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 July 1978: highest significance records shown on the map
Station	Country	Type	Value	Significance
Grand Meadow	United States	Record daily precipitation	94.2 mm (3.7 in)	67 of 100 (Major)
Maya	Australia	Record daily precipitation	63.0 mm (2.5 in)	65 of 100 (Major)
Port Aux Basques	Canada	Record daily precipitation	57.8 mm (2.3 in)	63 of 100 (Major)
Sable Island	Canada	Record daily precipitation	53.4 mm (2.1 in)	57 of 100 (Notable)
Tallinn	Estonia	Record daily precipitation	38.2 mm (1.5 in)	54 of 100 (Notable)
Ntazepetrovsk	Russia	Record daily precipitation	48.8 mm (1.9 in)	52 of 100 (Notable)
San Saba	United States	Record high maximum temperature	44.4 C (111.9 F)	52 of 100 (Notable)
Alapajevsk	Russia	Record daily precipitation	50.1 mm (2.0 in)	51 of 100 (Notable)
Battle Ground	United States	Record daily precipitation	27.9 mm (1.1 in)	50 of 100 (Notable)
Donalsonville 1 S	United States	Record daily precipitation	89.7 mm (3.5 in)	49 of 100 (Notable)
Blackville 3 W	United States	Record daily precipitation	84.6 mm (3.3 in)	47 of 100 (Notable)
Hudson Bay	Canada	Record daily precipitation	58.8 mm (2.3 in)	46 of 100 (Notable)
Green Bay	United States	Record daily precipitation	30.2 mm (1.2 in)	45 of 100 (Notable)
Great Falls	Canada	Record daily precipitation	44.5 mm (1.8 in)	44 of 100 (Notable)
Dongara	Australia	Record daily precipitation	76.6 mm (3.0 in)	43 of 100 (Notable)
Bombana (Cfe)	Mexico	Record daily precipitation	58.9 mm (2.3 in)	42 of 100 (Notable)
Ujar	Russia	Record daily precipitation	37.1 mm (1.5 in)	42 of 100 (Notable)
Cordele	United States	Record daily precipitation	83.8 mm (3.3 in)	42 of 100 (Notable)
Turinsk	Russia	Record daily precipitation	61.9 mm (2.4 in)	41 of 100 (Notable)
Spencer	United States	Record daily precipitation	37.6 mm (1.5 in)	41 of 100 (Notable)
Halmstad	Sweden	Record low minimum temperature	7.4 C (45.3 F)	40 of 100 (Notable)
Harlem	United States	Record daily precipitation	31.8 mm (1.3 in)	40 of 100 (Notable)
Somerville 4 NW	United States	Record low maximum temperature	22.2 C (72.0 F)	40 of 100 (Notable)
Liepaja	Latvia	Record low minimum temperature	7.1 C (44.8 F)	39 of 100 (Notable)
Waynesboro 2 S	United States	Record daily precipitation	58.2 mm (2.3 in)	39 of 100 (Notable)
Byro	Australia	Record daily precipitation	32.0 mm (1.3 in)	38 of 100 (Notable)
Ulricehamn	Sweden	Record low minimum temperature	3.2 C (37.8 F)	38 of 100 (Notable)
Freehold-Marlboro	United States	Record low maximum temperature	22.2 C (72.0 F)	38 of 100 (Notable)
Red Springs 1 SE	United States	Record daily precipitation	51.3 mm (2.0 in)	38 of 100 (Notable)
Brady	United States	Record high maximum temperature	43.3 C (109.9 F)	38 of 100 (Notable)
Doodlakine	Australia	Record daily precipitation	29.4 mm (1.2 in)	37 of 100 (Notable)
Stephenville A	Canada	Record daily precipitation	42.0 mm (1.7 in)	37 of 100 (Notable)
Karlshamn	Sweden	Record low minimum temperature	5.7 C (42.3 F)	37 of 100 (Notable)
Hillsboro	United States	Record high minimum temperature	27.8 C (82.0 F)	37 of 100 (Notable)
Dowerin	Australia	Record daily precipitation	45.5 mm (1.8 in)	36 of 100 (Notable)
Yorkton A	Canada	Record daily precipitation	39.9 mm (1.6 in)	36 of 100 (Notable)
Vastervik	Sweden	Record low minimum temperature	6.7 C (44.1 F)	36 of 100 (Notable)
Duncan	United States	Record high maximum temperature	41.7 C (107.1 F)	36 of 100 (Notable)
Elk	United States	Record high maximum temperature	33.9 C (93.0 F)	36 of 100 (Notable)
Moro	United States	Record low maximum temperature	17.8 C (64.0 F)	36 of 100 (Notable)
Hyndman	United States	Record daily precipitation	39.4 mm (1.6 in)	36 of 100 (Notable)
Brady	United States	Record high minimum temperature	23.9 C (75.0 F)	36 of 100 (Notable)
Brownwood 2NE	United States	Record high minimum temperature	27.2 C (81.0 F)	36 of 100 (Notable)
Rochester	United States	Record daily precipitation	43.2 mm (1.7 in)	36 of 100 (Notable)
Goldbutte 7 N	United States	Record daily precipitation	34.8 mm (1.4 in)	35 of 100 (Notable)
Brookings	United States	Record high maximum temperature	31.1 C (88.0 F)	35 of 100 (Notable)
Moorleah (Preolenna Road)	Australia	Record daily precipitation	50.0 mm (2.0 in)	34 of 100 (Routine)
Greifswald	Germany	Record low minimum temperature	8.6 C (47.5 F)	34 of 100 (Routine)
Villa de Chiapilla	Mexico	Record daily precipitation	67.8 mm (2.7 in)	34 of 100 (Routine)
Ekaterinburg	Russia	Record daily precipitation	64.8 mm (2.6 in)	34 of 100 (Routine)
Indianola 1SW	United States	Record high minimum temperature	25.6 C (78.1 F)	34 of 100 (Routine)
Gari	Russia	Record daily precipitation	32.0 mm (1.3 in)	33 of 100 (Routine)
Tarpon Spgs Sewage Plt	United States	Record daily precipitation	94.2 mm (3.7 in)	33 of 100 (Routine)
Brunswick	United States	Record low maximum temperature	24.4 C (75.9 F)	33 of 100 (Routine)
Alpine	United States	Record high maximum temperature	37.8 C (100.0 F)	33 of 100 (Routine)
Everett	United States	Record low maximum temperature	15.6 C (60.1 F)	33 of 100 (Routine)
Rosalia	United States	Record low maximum temperature	17.2 C (63.0 F)	33 of 100 (Routine)
Lake Lynn	United States	Record daily precipitation	34.8 mm (1.4 in)	33 of 100 (Routine)
Albacete Los Llanos	Spain	Record high maximum temperature	42.6 C (108.7 F)	32 of 100 (Routine)
Healy	United States	Record high minimum temperature	23.9 C (75.0 F)	32 of 100 (Routine)

Counts by Type and Timescale

794 records

Records set or tied on 17 July 1978 by type: Highest daily maximum 168, Lowest daily maximum 140, Highest daily minimum 111, Lowest daily minimum 115, Heaviest daily rainfall 260.

Records on 17 July 1978 by type
Record type	Records
Highest daily maximum	168
Lowest daily maximum	140
Highest daily minimum	111
Lowest daily minimum	115
Heaviest daily rainfall	260
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 17 July 1978 by timescale: all-time 4, monthly 11, daily 779.

How Much Records Were Beaten By

618 broken records

Margins by which the 618 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 58.5. Ties are not counted.

Top 20 by Significance

17 July 1978

Top 20 records on 17 July 1978 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 July 1978	Grand Meadow, US	daily rain	94.2 mm (3.7 in)	54.6 mm (2.1 in)	69 years	67 of 100 (Major)
17 July 1978	Maya, AU	monthly rain	63.0 mm (2.5 in)	20.8 mm (0.8 in)	50 years	65 of 100 (Major)
17 July 1978	Port Aux Basques, CA	daily rain	57.8 mm (2.3 in)	39.8 mm (1.6 in)	63 years	63 of 100 (Major)
17 July 1978	Sable Island, CA	daily rain	53.4 mm (2.1 in)	27.5 mm (1.1 in)	82 years	57 of 100 (Notable)
17 July 1978	Tallinn, EE	daily rain	38.2 mm (1.5 in)	28.0 mm (1.1 in)	36 years	54 of 100 (Notable)
17 July 1978	Ntazepetrovsk, RU	daily rain	48.8 mm (1.9 in)	29.7 mm (1.2 in)	29 years	52 of 100 (Notable)
17 July 1978	San Saba, US	all-time high max	44.4 C (111.9 F)	1.6 C (2.9 F)	68 years	52 of 100 (Notable)
17 July 1978	Alapajevsk, RU	daily rain	50.1 mm (2.0 in)	27.3 mm (1.1 in)	32 years	51 of 100 (Notable)
17 July 1978	Battle Ground, US	daily rain	27.9 mm (1.1 in)	24.1 mm (0.9 in)	23 years	50 of 100 (Notable)
17 July 1978	Donalsonville 1 S, US	daily rain	89.7 mm (3.5 in)	58.5 mm (2.3 in)	23 years	49 of 100 (Notable)
17 July 1978	Blackville 3 W, US	daily rain	84.6 mm (3.3 in)	21.4 mm (0.8 in)	81 years	47 of 100 (Notable)
17 July 1978	Hudson Bay, CA	daily rain	58.8 mm (2.3 in)	50.7 mm (2.0 in)	12 years	46 of 100 (Notable)
17 July 1978	Green Bay, US	daily rain	30.2 mm (1.2 in)	11.1 mm (0.4 in)	86 years	45 of 100 (Notable)
17 July 1978	Great Falls, CA	daily rain	44.5 mm (1.8 in)	26.7 mm (1.1 in)	23 years	44 of 100 (Notable)
17 July 1978	Dongara, AU	monthly rain	76.6 mm (3.0 in)	10.1 mm (0.4 in)	43 years	43 of 100 (Notable)
17 July 1978	Bombana (Cfe), MX	daily rain	58.9 mm (2.3 in)	39.1 mm (1.5 in)	32 years	42 of 100 (Notable)
17 July 1978	Ujar, RU	daily rain	37.1 mm (1.5 in)	27.2 mm (1.1 in)	12 years	42 of 100 (Notable)
17 July 1978	Cordele, US	daily rain	83.8 mm (3.3 in)	32.7 mm (1.3 in)	41 years	42 of 100 (Notable)
17 July 1978	Turinsk, RU	daily rain	61.9 mm (2.4 in)	24.8 mm (1.0 in)	19 years	41 of 100 (Notable)
17 July 1978	Spencer, US	daily rain	37.6 mm (1.5 in)	9.7 mm (0.38 in)	84 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

1793 to 1978

Records set or tied on this calendar date in each year from 1793 to 1978. 1978 had 794 records.

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

Records on 07-17 in each year
Year	Records
1793	1
1798	1
1799	1
1801	2
1802	1
1821	1
1827	1
1833	1
1840	1
1842	1
1845	2
1852	1
1862	1
1863	1
1865	2
1866	1
1871	1
1874	1
1875	2
1877	1
1880	1
1881	2
1882	2
1883	5
1884	1
1887	1
1888	2
1889	4
1890	4
1892	5
1893	3
1894	4
1895	1
1896	3
1897	1
1898	2
1899	4
1900	4
1901	6
1902	6
1903	13
1904	4
1905	9
1906	13
1907	12
1908	32
1909	16
1910	8
1911	52
1912	13
1913	26
1914	67
1915	71
1916	27
1917	62
1918	41
1919	45
1920	50
1921	120
1922	206
1923	105
1924	165
1925	275
1926	251
1927	118
1928	116
1929	154
1930	366
1931	492
1932	293
1933	216
1934	438
1935	245
1936	815
1937	313
1938	303
1939	540
1940	319
1941	386
1942	522
1943	321
1944	236
1945	681
1946	523
1947	505
1948	278
1949	405
1950	645
1951	356
1952	772
1953	557
1954	517
1955	512
1956	608
1957	298
1958	693
1959	631
1960	324
1961	408
1962	421
1963	223
1964	481
1965	753
1966	454
1967	965
1968	707
1969	741
1970	486
1971	790
1972	634
1973	680
1974	691
1975	775
1976	1,041
1977	764
1978	794
1979	642
1980	1,137
1981	628
1982	850
1983	1,120
1984	875
1985	483
1986	1,214
1987	1,388
1988	1,239
1989	1,289
1990	953
1991	763
1992	1,055
1993	956
1994	631
1995	917
1996	911
1997	816
1998	1,031
1999	925
2000	1,166
2001	916
2002	995
2003	1,396
2004	908
2005	1,184
2006	1,509
2007	1,218
2008	508
2009	1,218
2010	965
2011	1,101
2012	934
2013	819
2014	1,456
2015	831
2016	679
2017	398
2018	750
2019	477
2020	515
2021	625
2022	791
2023	1,060
2024	814
2025	966
2026	860

Download the Data

Data for records on 1978-07-17: 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	544
10 to 20	46
20 to 30	20
30 to 40	5
40 to 50	0
50 to 60	3