Weather Records on 17 May 1978

872 weather records were set or tied worldwide on 17 May 1978. Highest significance: Gunbower Gee Tee Stud, AU.

Key Facts for 17 May 1978

On 17 May 1978, 872 weather records were set or tied at long-record stations worldwide.
174 were record highs and 215 were record lows, counting maximum and minimum temperature.
By timescale, 4 were all-time records, 23 monthly and 845 daily.
Gunbower Gee Tee Stud set a daily record precipitation of 36.0 mm (1.4 in) on 17 May 1978.
Across 167 earlier years (1802 to 2026) the same calendar date averaged 432 records.

Record Map

872 stations

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

Weather records on 17 May 1978: highest significance records shown on the map
Station	Country	Type	Value	Significance
Gunbower Gee Tee Stud	Australia	Record daily precipitation	36.0 mm (1.4 in)	66 of 100 (Major)
The Rock (Bullenbong)	Australia	Record daily precipitation	66.0 mm (2.6 in)	65 of 100 (Major)
Emblem	United States	Record daily precipitation	26.2 mm (1.0 in)	65 of 100 (Major)
Canary Island	Australia	Record daily precipitation	37.4 mm (1.5 in)	61 of 100 (Major)
Busby	United States	Record daily precipitation	52.1 mm (2.1 in)	59 of 100 (Notable)
Nullawil	Australia	Record daily precipitation	54.8 mm (2.2 in)	57 of 100 (Notable)
Churchill A	Canada	Record daily snowfall	47.6 cm (18.7 in)	56 of 100 (Notable)
Kaycee	United States	Record daily precipitation	32.8 mm (1.3 in)	56 of 100 (Notable)
Berkeley	United States	Record high minimum temperature	18.3 C (64.9 F)	54 of 100 (Notable)
Anhembi	Brazil	Record daily precipitation	56.3 mm (2.2 in)	53 of 100 (Notable)
Clyde A	Canada	Record daily snowfall	19.6 cm (7.7 in)	52 of 100 (Notable)
Moorcroft 3S	United States	Record daily snowfall	12.7 cm (5.0 in)	52 of 100 (Notable)
Laramie AP	United States	Record daily precipitation	40.9 mm (1.6 in)	51 of 100 (Notable)
Billings Intl AP	United States	Record daily precipitation	33.5 mm (1.3 in)	51 of 100 (Notable)
Coorabulka	Australia	Record daily precipitation	61.0 mm (2.4 in)	50 of 100 (Notable)
Fernao Dias	Brazil	Record daily precipitation	105.0 mm (4.1 in)	50 of 100 (Notable)
Bauru	Brazil	Record daily precipitation	70.1 mm (2.8 in)	49 of 100 (Notable)
Izium	Ukraine	Record daily precipitation	40.8 mm (1.6 in)	49 of 100 (Notable)
Berlin	United States	Record daily precipitation	38.6 mm (1.5 in)	49 of 100 (Notable)
Galia	Brazil	Record daily precipitation	115.0 mm (4.5 in)	48 of 100 (Notable)
Duartina	Brazil	Record daily precipitation	105.0 mm (4.1 in)	48 of 100 (Notable)
Buffalo Bill Dam	United States	Record daily precipitation	49.5 mm (1.9 in)	48 of 100 (Notable)
Aquidaba	Brazil	Record daily precipitation	110.8 mm (4.4 in)	47 of 100 (Notable)
Lame Deer	United States	Record daily precipitation	50.8 mm (2.0 in)	47 of 100 (Notable)
Usina Do Chicao	Brazil	Record daily precipitation	33.0 mm (1.3 in)	46 of 100 (Notable)
Crow Agency	United States	Record daily precipitation	38.6 mm (1.5 in)	46 of 100 (Notable)
Ribeirao Do Sul	Brazil	Record daily precipitation	86.5 mm (3.4 in)	45 of 100 (Notable)
Ponte Melo Peixoto	Brazil	Record daily precipitation	62.6 mm (2.5 in)	44 of 100 (Notable)
Usina Turvinho	Brazil	Record daily precipitation	57.2 mm (2.3 in)	44 of 100 (Notable)
Engenheiro Maia	Brazil	Record daily precipitation	58.0 mm (2.3 in)	43 of 100 (Notable)
Estes Park	United States	Record daily precipitation	29.0 mm (1.1 in)	43 of 100 (Notable)
White Cliffs (Tongo)	Australia	Record daily precipitation	27.9 mm (1.1 in)	42 of 100 (Notable)
Ivanhoe (Beilpajah)	Australia	Record daily precipitation	34.0 mm (1.3 in)	42 of 100 (Notable)
Usina Pari	Brazil	Record daily precipitation	67.8 mm (2.7 in)	42 of 100 (Notable)
Manangatang	Australia	Record daily precipitation	47.0 mm (1.9 in)	41 of 100 (Notable)
Tatui	Brazil	Record daily precipitation	58.3 mm (2.3 in)	41 of 100 (Notable)
Pavlograd	Ukraine	Record daily precipitation	39.6 mm (1.6 in)	41 of 100 (Notable)
Heart Mtn	United States	Record daily precipitation	30.5 mm (1.2 in)	41 of 100 (Notable)
Tiete	Brazil	Record daily precipitation	42.4 mm (1.7 in)	40 of 100 (Notable)
Fazenda Cachoeirinha	Brazil	Record daily precipitation	50.4 mm (2.0 in)	40 of 100 (Notable)
Garca	Brazil	Record daily precipitation	62.9 mm (2.5 in)	40 of 100 (Notable)
Ibirarema	Brazil	Record daily precipitation	93.8 mm (3.7 in)	40 of 100 (Notable)
Walden	United States	Record daily snowfall	24.1 cm (9.5 in)	40 of 100 (Notable)
Pirapitingui	Brazil	Record daily precipitation	47.6 mm (1.9 in)	39 of 100 (Notable)
Churchill A	Canada	Record daily precipitation	55.6 mm (2.2 in)	39 of 100 (Notable)
Miles City	United States	Record daily precipitation	35.1 mm (1.4 in)	39 of 100 (Notable)
Gettysburg	United States	Record low maximum temperature	12.2 C (54.0 F)	39 of 100 (Notable)
W Chester 2 NW	United States	Record low maximum temperature	12.2 C (54.0 F)	39 of 100 (Notable)
Peak Hill (Bruie Plains)	Australia	Record daily precipitation	49.0 mm (1.9 in)	38 of 100 (Notable)
Cachoeira da Graca	Brazil	Record daily precipitation	43.2 mm (1.7 in)	38 of 100 (Notable)
Leo 6 SW	United States	Record daily snowfall	15.2 cm (6.0 in)	38 of 100 (Notable)
Yeeda	Australia	Record daily precipitation	35.0 mm (1.4 in)	37 of 100 (Notable)
Capivari	Brazil	Record daily precipitation	46.0 mm (1.8 in)	37 of 100 (Notable)
Eden (Pirajibu)	Brazil	Record daily precipitation	44.5 mm (1.8 in)	37 of 100 (Notable)
Sao Manuel	Brazil	Record daily precipitation	158.6 mm (6.2 in)	37 of 100 (Notable)
Mairipora	Brazil	Record daily precipitation	50.2 mm (2.0 in)	37 of 100 (Notable)
Elias Fausto	Brazil	Record daily precipitation	42.5 mm (1.7 in)	37 of 100 (Notable)
Sao Miguel Arcanjo	Brazil	Record daily precipitation	49.6 mm (2.0 in)	37 of 100 (Notable)
Hvar	Croatia	Record low minimum temperature	10.3 C (50.5 F)	37 of 100 (Notable)
Longmont 2 ESE	United States	Record high minimum temperature	13.9 C (57.0 F)	37 of 100 (Notable)

Counts by Type and Timescale

872 records

Records set or tied on 17 May 1978 by type: Highest daily maximum 95, Lowest daily maximum 159, Highest daily minimum 79, Lowest daily minimum 56, Heaviest daily rainfall 466, Heaviest daily snowfall 13, Deepest snow cover 4.

Records on 17 May 1978 by type
Record type	Records
Highest daily maximum	95
Lowest daily maximum	159
Highest daily minimum	79
Lowest daily minimum	56
Heaviest daily rainfall	466
Heaviest daily snowfall	13
Deepest snow cover	4

Records on 17 May 1978 by timescale: all-time 4, monthly 23, daily 845.

How Much Records Were Beaten By

749 broken records

Margins by which the 749 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 153.0. Ties are not counted.

Top 20 by Significance

17 May 1978

Top 20 records on 17 May 1978 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 May 1978	Gunbower Gee Tee Stud, AU	daily rain	36.0 mm (1.4 in)	30.2 mm (1.2 in)	67 years	66 of 100 (Major)
17 May 1978	The Rock (Bullenbong), AU	monthly rain	66.0 mm (2.6 in)	15.2 mm (0.6 in)	89 years	65 of 100 (Major)
17 May 1978	Emblem, US	daily rain	26.2 mm (1.0 in)	20.1 mm (0.8 in)	64 years	65 of 100 (Major)
17 May 1978	Canary Island, AU	daily rain	37.4 mm (1.5 in)	17.3 mm (0.7 in)	87 years	61 of 100 (Major)
17 May 1978	Busby, US	daily rain	52.1 mm (2.1 in)	37.9 mm (1.5 in)	40 years	59 of 100 (Notable)
17 May 1978	Nullawil, AU	daily rain	54.8 mm (2.2 in)	39.6 mm (1.6 in)	32 years	57 of 100 (Notable)
17 May 1978	Churchill A, CA	all-time snowfall	47.6 cm (18.7 in)	11.5 cm (4.5 in)	7 years	56 of 100 (Notable)
17 May 1978	Kaycee, US	daily rain	32.8 mm (1.3 in)	19.3 mm (0.8 in)	75 years	56 of 100 (Notable)
17 May 1978	Berkeley, US	daily high min	18.3 C (64.9 F)	4.4 C (7.9 F)	80 years	54 of 100 (Notable)
17 May 1978	Anhembi, BR	daily rain	56.3 mm (2.2 in)	45.2 mm (1.8 in)	36 years	53 of 100 (Notable)
17 May 1978	Clyde A, CA	daily snowfall	19.6 cm (7.7 in)	15.3 cm (6.0 in)	28 years	52 of 100 (Notable)
17 May 1978	Moorcroft 3S, US	daily snowfall	12.7 cm (5.0 in)	12.7 cm (5.0 in)	68 years	52 of 100 (Notable)
17 May 1978	Laramie AP, US	daily rain	40.9 mm (1.6 in)	30.7 mm (1.2 in)	27 years	51 of 100 (Notable)
17 May 1978	Billings Intl AP, US	daily rain	33.5 mm (1.3 in)	28.2 mm (1.1 in)	28 years	51 of 100 (Notable)
17 May 1978	Coorabulka, AU	daily rain	61.0 mm (2.4 in)	59.7 mm (2.4 in)	9 years	50 of 100 (Notable)
17 May 1978	Fernao Dias, BR	monthly rain	105.0 mm (4.1 in)	32.0 mm (1.3 in)	41 years	50 of 100 (Notable)
17 May 1978	Bauru, BR	daily rain	70.1 mm (2.8 in)	43.7 mm (1.7 in)	40 years	49 of 100 (Notable)
17 May 1978	Izium, UA	daily rain	40.8 mm (1.6 in)	33.2 mm (1.3 in)	16 years	49 of 100 (Notable)
17 May 1978	Berlin, US	daily rain	38.6 mm (1.5 in)	15.5 mm (0.6 in)	59 years	49 of 100 (Notable)
17 May 1978	Galia, BR	monthly rain	115.0 mm (4.5 in)	41.0 mm (1.6 in)	21 years	48 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

1802 to 1978

Records set or tied on this calendar date in each year from 1802 to 1978. 1978 had 872 records.

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

Records on 05-17 in each year
Year	Records
1802	2
1803	1
1808	1
1816	1
1834	1
1837	1
1839	1
1847	2
1848	1
1851	1
1853	1
1855	1
1858	1
1859	1
1861	2
1862	2
1863	2
1864	1
1871	2
1872	2
1873	2
1874	4
1877	1
1878	1
1879	2
1880	1
1881	1
1882	2
1883	3
1885	1
1887	1
1888	2
1889	3
1891	8
1892	4
1893	3
1895	8
1896	2
1897	3
1898	6
1899	7
1900	12
1901	2
1902	3
1903	9
1904	12
1905	10
1906	22
1907	10
1908	5
1909	33
1910	16
1911	30
1912	16
1913	24
1914	24
1915	53
1916	49
1917	18
1918	56
1919	35
1920	46
1921	50
1922	30
1923	95
1924	80
1925	326
1926	133
1927	264
1928	127
1929	168
1930	421
1931	201
1932	288
1933	365
1934	373
1935	341
1936	270
1937	183
1938	340
1939	285
1940	338
1941	408
1942	589
1943	855
1944	521
1945	799
1946	586
1947	249
1948	412
1949	544
1950	371
1951	373
1952	777
1953	441
1954	298
1955	570
1956	1,166
1957	469
1958	331
1959	488
1960	402
1961	291
1962	1,325
1963	368
1964	417
1965	462
1966	489
1967	644
1968	564
1969	638
1970	711
1971	723
1972	610
1973	1,016
1974	1,302
1975	365
1976	426
1977	1,078
1978	872
1979	459
1980	768
1981	940
1982	476
1983	1,326
1984	925
1985	561
1986	921
1987	1,054
1988	1,096
1989	1,307
1990	1,135
1991	1,237
1992	1,025
1993	495
1994	858
1995	1,734
1996	1,706
1997	1,619
1998	1,080
1999	795
2000	825
2001	960
2002	964
2003	1,127
2004	769
2005	784
2006	1,522
2007	742
2008	1,309
2009	1,050
2010	880
2011	1,483
2012	711
2013	739
2014	1,062
2015	824
2016	741
2017	1,302
2018	726
2019	686
2020	496
2021	443
2022	479
2023	385
2024	566
2025	928
2026	745

Download the Data

Data for records on 1978-05-17: 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 20	649
20 to 40	82
40 to 60	12
60 to 80	2
80 to 100	0
100 to 120	1
120 to 140	1
140 to 160	2