Weather Records on 30 May 1978

888 weather records were set or tied worldwide on 30 May 1978. Highest significance: Ganmain Post Office, AU.

Key Facts for 30 May 1978

On 30 May 1978, 888 weather records were set or tied at long-record stations worldwide.
354 were record highs and 146 were record lows, counting maximum and minimum temperature.
By timescale, 3 were all-time records, 74 monthly and 811 daily.
Ganmain Post Office set a monthly record daily precipitation of 88.0 mm (3.5 in) on 30 May 1978.
Across 165 earlier years (1818 to 2026) the same calendar date averaged 436 records.

Record Map

888 stations

888 station records on 30 May 1978 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 30 May 1978: highest significance records shown on the map
Station	Country	Type	Value	Significance
Ganmain Post Office	Australia	Record daily precipitation	88.0 mm (3.5 in)	79 of 100 (Major)
Wagga Wagga (Kooringal)	Australia	Record daily precipitation	88.0 mm (3.5 in)	74 of 100 (Major)
Coolamon Post Office	Australia	Record daily precipitation	70.0 mm (2.8 in)	72 of 100 (Major)
Moorcroft 3S	United States	Record daily snowfall	20.3 cm (8.0 in)	67 of 100 (Major)
Booligal (Belmont)	Australia	Record daily precipitation	48.0 mm (1.9 in)	66 of 100 (Major)
Tarcutta Post Office	Australia	Record daily precipitation	68.0 mm (2.7 in)	65 of 100 (Major)
Groongal (Groongal Station)	Australia	Record daily precipitation	70.0 mm (2.8 in)	65 of 100 (Major)
Lindsay	United States	Record daily precipitation	46.7 mm (1.8 in)	63 of 100 (Major)
Yanco Regulator	Australia	Record daily precipitation	65.0 mm (2.6 in)	62 of 100 (Major)
Lockhart Bowling Club	Australia	Record daily precipitation	45.8 mm (1.8 in)	61 of 100 (Major)
Groongal (Gundaline)	Australia	Record daily precipitation	77.6 mm (3.1 in)	60 of 100 (Major)
Darlington Point (St Pauls Clo	Australia	Record daily precipitation	89.2 mm (3.5 in)	60 of 100 (Major)
Ribeirao Corrente	Brazil	Record daily precipitation	85.4 mm (3.4 in)	58 of 100 (Notable)
Matong (Main Street)	Australia	Record daily precipitation	108.0 mm (4.3 in)	57 of 100 (Notable)
Grong Grong (Berembed)	Australia	Record daily precipitation	60.0 mm (2.4 in)	55 of 100 (Notable)
Temascales	Mexico	Record daily precipitation	75.4 mm (3.0 in)	54 of 100 (Notable)
Shamhor	Azerbaijan	Record daily precipitation	50.5 mm (2.0 in)	53 of 100 (Notable)
Wagga Wagga AMO	Australia	Record daily precipitation	91.2 mm (3.6 in)	53 of 100 (Notable)
Banderlierkop (Pol)	South Africa	Record daily precipitation	27.0 mm (1.1 in)	53 of 100 (Notable)
Farrell Sharon	United States	Record daily precipitation	41.1 mm (1.6 in)	53 of 100 (Notable)
Adelong Post Office	Australia	Record daily precipitation	59.4 mm (2.3 in)	52 of 100 (Notable)
Ardlethan Post Office	Australia	Record daily precipitation	37.4 mm (1.5 in)	52 of 100 (Notable)
Yanco (Billinbah East)	Australia	Record daily precipitation	80.8 mm (3.2 in)	52 of 100 (Notable)
Hamilton Station	Australia	Record daily precipitation	44.5 mm (1.8 in)	51 of 100 (Notable)
The Rock (Bullenbong)	Australia	Record daily precipitation	48.0 mm (1.9 in)	51 of 100 (Notable)
Wagga Wagga Research Centre	Australia	Record daily precipitation	69.8 mm (2.7 in)	50 of 100 (Notable)
Itiuba	Brazil	Record daily precipitation	40.0 mm (1.6 in)	50 of 100 (Notable)
Ilbunga	Australia	Record daily precipitation	25.5 mm (1.0 in)	49 of 100 (Notable)
Mundarlo (Yabtree)	Australia	Record daily precipitation	45.0 mm (1.8 in)	48 of 100 (Notable)
Wibaux 2 E	United States	Record daily precipitation	50.0 mm (2.0 in)	48 of 100 (Notable)
Darlington Point (Bringagee)	Australia	Record daily precipitation	75.0 mm (3.0 in)	47 of 100 (Notable)
Onda Verde	Brazil	Record daily precipitation	91.8 mm (3.6 in)	47 of 100 (Notable)
Port Stanley	Canada	Record high minimum temperature	18.0 C (64.4 F)	47 of 100 (Notable)
Tumbarumba Post Office	Australia	Record daily precipitation	67.4 mm (2.7 in)	46 of 100 (Notable)
Fazenda Ajudas	Brazil	Record daily precipitation	65.1 mm (2.6 in)	46 of 100 (Notable)
Fazenda Bom Retiro	Brazil	Record daily precipitation	57.2 mm (2.3 in)	46 of 100 (Notable)
Bay City	United States	Record daily precipitation	55.1 mm (2.2 in)	46 of 100 (Notable)
Grong Grong (Junee St)	Australia	Record daily precipitation	89.8 mm (3.5 in)	45 of 100 (Notable)
Tamandua	Brazil	Record daily precipitation	63.7 mm (2.5 in)	45 of 100 (Notable)
Moosonee Ua	Canada	Record daily precipitation	25.1 mm (1.0 in)	45 of 100 (Notable)
Junee Treatment Works	Australia	Record daily precipitation	37.4 mm (1.5 in)	44 of 100 (Notable)
Leeton Caravan Park	Australia	Record daily precipitation	63.4 mm (2.5 in)	44 of 100 (Notable)
Carrathool Motors	Australia	Record daily precipitation	57.0 mm (2.2 in)	44 of 100 (Notable)
Old Junee (Millbank)	Australia	Record daily precipitation	41.0 mm (1.6 in)	42 of 100 (Notable)
Monte Verde Paulista	Brazil	Record daily precipitation	48.7 mm (1.9 in)	42 of 100 (Notable)
Carway	Canada	Record daily snowfall	27.4 cm (10.8 in)	42 of 100 (Notable)
Wagga Wagga (Berrillee)	Australia	Record daily precipitation	60.8 mm (2.4 in)	41 of 100 (Notable)
Barellan Post Office	Australia	Record daily precipitation	40.8 mm (1.6 in)	41 of 100 (Notable)
Fazenda Palmeiras	Brazil	Record daily precipitation	90.1 mm (3.5 in)	41 of 100 (Notable)
Altair	Brazil	Record daily precipitation	90.0 mm (3.5 in)	41 of 100 (Notable)
Lussanvira	Brazil	Record daily precipitation	46.2 mm (1.8 in)	41 of 100 (Notable)
Chula Vista	United States	Record high maximum temperature	26.1 C (79.0 F)	41 of 100 (Notable)
Creston	United States	Record daily precipitation	49.8 mm (2.0 in)	41 of 100 (Notable)
San Francisco Dwtn	United States	Record high maximum temperature	32.8 C (91.0 F)	41 of 100 (Notable)
Wantabadgery	Australia	Record daily precipitation	41.2 mm (1.6 in)	40 of 100 (Notable)
Marrar (Centenary Drive)	Australia	Record daily precipitation	40.3 mm (1.6 in)	40 of 100 (Notable)
Binya Post Office	Australia	Record daily precipitation	46.0 mm (1.8 in)	40 of 100 (Notable)
Castores	Brazil	Record daily precipitation	98.2 mm (3.9 in)	40 of 100 (Notable)
Huntingdon	Canada	Record high maximum temperature	33.3 C (91.9 F)	40 of 100 (Notable)
Glendive	United States	Record daily precipitation	39.1 mm (1.5 in)	40 of 100 (Notable)

Counts by Type and Timescale

888 records

Records set or tied on 30 May 1978 by type: Highest daily maximum 193, Lowest daily maximum 69, Highest daily minimum 161, Lowest daily minimum 77, Heaviest daily rainfall 384, Heaviest daily snowfall 4.

Records on 30 May 1978 by type
Record type	Records
Highest daily maximum	193
Lowest daily maximum	69
Highest daily minimum	161
Lowest daily minimum	77
Heaviest daily rainfall	384
Heaviest daily snowfall	4
Deepest snow cover	0

Records on 30 May 1978 by timescale: all-time 3, monthly 74, daily 811.

How Much Records Were Beaten By

721 broken records

Margins by which the 721 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 203.0. Ties are not counted.

Top 20 by Significance

30 May 1978

Top 20 records on 30 May 1978 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 May 1978	Ganmain Post Office, AU	monthly rain	88.0 mm (3.5 in)	45.8 mm (1.8 in)	72 years	79 of 100 (Major)
30 May 1978	Wagga Wagga (Kooringal), AU	monthly rain	88.0 mm (3.5 in)	22.5 mm (0.9 in)	89 years	74 of 100 (Major)
30 May 1978	Coolamon Post Office, AU	monthly rain	70.0 mm (2.8 in)	20.5 mm (0.8 in)	89 years	72 of 100 (Major)
30 May 1978	Moorcroft 3S, US	daily snowfall	20.3 cm (8.0 in)	20.3 cm (8.0 in)	68 years	67 of 100 (Major)
30 May 1978	Booligal (Belmont), AU	daily rain	48.0 mm (1.9 in)	29.5 mm (1.2 in)	85 years	66 of 100 (Major)
30 May 1978	Tarcutta Post Office, AU	monthly rain	68.0 mm (2.7 in)	17.2 mm (0.7 in)	85 years	65 of 100 (Major)
30 May 1978	Groongal (Groongal Station), AU	daily rain	70.0 mm (2.8 in)	23.3 mm (0.9 in)	95 years	65 of 100 (Major)
30 May 1978	Lindsay, US	daily rain	46.7 mm (1.8 in)	27.6 mm (1.1 in)	60 years	63 of 100 (Major)
30 May 1978	Yanco Regulator, AU	monthly rain	65.0 mm (2.6 in)	23.6 mm (0.9 in)	36 years	62 of 100 (Major)
30 May 1978	Lockhart Bowling Club, AU	daily rain	45.8 mm (1.8 in)	22.2 mm (0.9 in)	64 years	61 of 100 (Major)
30 May 1978	Groongal (Gundaline), AU	monthly rain	77.6 mm (3.1 in)	19.2 mm (0.8 in)	60 years	60 of 100 (Major)
30 May 1978	Darlington Point (St Pauls Clo, AU	monthly rain	89.2 mm (3.5 in)	40.9 mm (1.6 in)	10 years	60 of 100 (Major)
30 May 1978	Ribeirao Corrente, BR	monthly rain	85.4 mm (3.4 in)	43.2 mm (1.7 in)	17 years	58 of 100 (Notable)
30 May 1978	Matong (Main Street), AU	all-time rain	108.0 mm (4.3 in)	21.8 mm (0.9 in)	4 years	57 of 100 (Notable)
30 May 1978	Grong Grong (Berembed), AU	monthly rain	60.0 mm (2.4 in)	7.2 mm (0.28 in)	89 years	55 of 100 (Notable)
30 May 1978	Temascales, MX	monthly rain	75.4 mm (3.0 in)	23.8 mm (0.9 in)	25 years	54 of 100 (Notable)
30 May 1978	Shamhor, AZ	daily rain	50.5 mm (2.0 in)	26.6 mm (1.0 in)	31 years	53 of 100 (Notable)
30 May 1978	Wagga Wagga AMO, AU	monthly rain	91.2 mm (3.6 in)	46.4 mm (1.8 in)	1 year	53 of 100 (Notable)
30 May 1978	Banderlierkop (Pol), ZA	daily rain	27.0 mm (1.1 in)	27.0 mm (1.1 in)	72 years	53 of 100 (Notable)
30 May 1978	Farrell Sharon, US	daily rain	41.1 mm (1.6 in)	24.6 mm (1.0 in)	60 years	53 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

1818 to 1978

Records set or tied on this calendar date in each year from 1818 to 1978. 1978 had 888 records.

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

Records on 05-30 in each year
Year	Records
1818	3
1844	1
1847	1
1848	1
1852	1
1853	1
1855	1
1856	1
1858	1
1860	2
1863	1
1864	1
1865	4
1867	1
1868	4
1870	1
1871	2
1873	4
1878	1
1879	1
1880	2
1881	1
1882	2
1883	1
1884	2
1885	1
1886	1
1887	1
1889	3
1890	1
1891	1
1892	2
1893	7
1894	2
1895	5
1896	1
1897	1
1898	2
1899	4
1900	1
1901	4
1902	9
1903	12
1904	7
1905	20
1906	8
1907	20
1908	32
1909	6
1910	22
1911	22
1912	26
1913	89
1914	25
1915	32
1916	41
1917	42
1918	31
1919	90
1920	28
1921	392
1922	72
1923	121
1924	187
1925	190
1926	201
1927	177
1928	86
1929	368
1930	530
1931	316
1932	256
1933	250
1934	731
1935	88
1936	579
1937	440
1938	309
1939	336
1940	289
1941	518
1942	500
1943	444
1944	325
1945	383
1946	310
1947	880
1948	386
1949	318
1950	376
1951	448
1952	295
1953	622
1954	271
1955	377
1956	466
1957	267
1958	480
1959	419
1960	274
1961	657
1962	454
1963	245
1964	709
1965	454
1966	326
1967	859
1968	357
1969	1,092
1970	483
1971	1,044
1972	721
1973	391
1974	631
1975	776
1976	499
1977	444
1978	888
1979	1,185
1980	650
1981	1,001
1982	981
1983	1,310
1984	2,543
1985	772
1986	1,264
1987	1,021
1988	1,371
1989	1,021
1990	983
1991	1,264
1992	1,413
1993	690
1994	834
1995	777
1996	893
1997	936
1998	1,190
1999	1,113
2000	1,391
2001	854
2002	940
2003	1,110
2004	1,219
2005	737
2006	1,179
2007	1,128
2008	829
2009	480
2010	771
2011	1,914
2012	720
2013	821
2014	551
2015	699
2016	540
2017	657
2018	1,319
2019	706
2020	920
2021	841
2022	1,034
2023	344
2024	600
2025	828
2026	525

Download the Data

Data for records on 1978-05-30: 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 50	714
50 to 100	6
100 to 150	0
150 to 200	0
200 to 250	1