Weather Records on 30 April 1978

631 weather records were set or tied worldwide on 30 April 1978. Highest significance: Dorado 2 WNW, PR.

Key Facts for 30 April 1978

On 30 April 1978, 631 weather records were set or tied at long-record stations worldwide.
109 were record highs and 322 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 9 monthly and 620 daily.
Dorado 2 WNW set a daily record precipitation of 116.8 mm (4.6 in) on 30 April 1978.
Across 165 earlier years (1795 to 2026) the same calendar date averaged 446 records.

Record Map

631 stations

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

Weather records on 30 April 1978: highest significance records shown on the map
Station	Country	Type	Value	Significance
Dorado 2 WNW	Puerto Rico [United States]	Record daily precipitation	116.8 mm (4.6 in)	57 of 100 (Notable)
Flagstaff (Tnk)	South Africa	Record daily precipitation	90.5 mm (3.6 in)	55 of 100 (Notable)
Isachsen	Canada	Record daily snowfall	7.3 cm (2.9 in)	51 of 100 (Notable)
Nicolet	Canada	Record daily snowfall	12.7 cm (5.0 in)	51 of 100 (Notable)
Dodge City	United States	Record daily precipitation	117.9 mm (4.6 in)	50 of 100 (Notable)
Lamar	United States	Record daily precipitation	39.1 mm (1.5 in)	48 of 100 (Notable)
Niobrara	United States	Record daily precipitation	49.0 mm (1.9 in)	47 of 100 (Notable)
Port Dover	Canada	Record low minimum temperature	-3.0 C (26.6 F)	44 of 100 (Notable)
Huntingdon	Canada	Record low minimum temperature	-5.0 C (23.0 F)	44 of 100 (Notable)
Brockville	Canada	Record low maximum temperature	5.0 C (41.0 F)	43 of 100 (Notable)
Montreal McGill	Canada	Record low minimum temperature	-4.4 C (24.1 F)	43 of 100 (Notable)
John Martin Dam	United States	Record daily precipitation	46.7 mm (1.8 in)	43 of 100 (Notable)
Lifton Pumping STN	United States	Record daily precipitation	31.2 mm (1.2 in)	42 of 100 (Notable)
Birobidzhan	Russia	Record daily precipitation	34.0 mm (1.3 in)	41 of 100 (Notable)
Port Stanley	Canada	Record low minimum temperature	-3.5 C (25.7 F)	40 of 100 (Notable)
Montreal McGill	Canada	Record low maximum temperature	2.8 C (37.0 F)	40 of 100 (Notable)
Mont-Aigoual	France	Record daily precipitation	101.0 mm (4.0 in)	40 of 100 (Notable)
Tkvarcheli	Georgia	Record daily precipitation	57.0 mm (2.2 in)	40 of 100 (Notable)
Parnu	Estonia	Record low minimum temperature	-3.8 C (25.2 F)	39 of 100 (Notable)
Richmond	Canada	Record low minimum temperature	-6.1 C (21.0 F)	38 of 100 (Notable)
Isabela Substn	Puerto Rico [United States]	Record daily precipitation	91.4 mm (3.6 in)	35 of 100 (Notable)
Canon City	United States	Record daily precipitation	50.0 mm (2.0 in)	35 of 100 (Notable)
Cambridge Bay A	Canada	Record daily snowfall	6.0 cm (2.4 in)	32 of 100 (Routine)
Causapscal	Canada	Record daily snowfall	13.5 cm (5.3 in)	32 of 100 (Routine)
Djavary	Georgia	Record daily precipitation	55.3 mm (2.2 in)	32 of 100 (Routine)
Chohataury	Georgia	Record daily precipitation	33.5 mm (1.3 in)	32 of 100 (Routine)
Catemaco	Mexico	Record low minimum temperature	13.9 C (57.0 F)	32 of 100 (Routine)
Berlin	United States	Record low minimum temperature	-8.9 C (16.0 F)	32 of 100 (Routine)
Border 3 N	United States	Record daily snowfall	7.6 cm (3.0 in)	32 of 100 (Routine)
Southampton	Canada	Record low maximum temperature	2.0 C (35.6 F)	31 of 100 (Routine)
Lennoxville	Canada	Record low maximum temperature	-0.6 C (30.9 F)	31 of 100 (Routine)
Tartu	Estonia	Record low minimum temperature	-5.6 C (21.9 F)	31 of 100 (Routine)
Tuxcueca	Mexico	Record high maximum temperature	36.7 C (98.1 F)	31 of 100 (Routine)
Plattsburgh AFB	United States	Record low minimum temperature	-3.3 C (26.1 F)	31 of 100 (Routine)
Grapevine Dam	United States	Record high minimum temperature	20.0 C (68.0 F)	31 of 100 (Routine)
Cody	United States	Record daily precipitation	43.7 mm (1.7 in)	31 of 100 (Routine)
South Pass City	United States	Record high minimum temperature	4.4 C (39.9 F)	31 of 100 (Routine)
Haliburton A	Canada	Record low minimum temperature	-6.7 C (19.9 F)	30 of 100 (Routine)
Tartu-Toravere	Estonia	Record low minimum temperature	-6.4 C (20.5 F)	30 of 100 (Routine)
Cuitzeo	Mexico	Record high minimum temperature	18.9 C (66.0 F)	30 of 100 (Routine)
Corozal Substn	Puerto Rico [United States]	Record daily precipitation	61.2 mm (2.4 in)	30 of 100 (Routine)
Tupper Lake Sunmount	United States	Record low minimum temperature	-8.3 C (17.1 F)	30 of 100 (Routine)
Westfield 2 SSE	United States	Record low minimum temperature	-1.7 C (28.9 F)	30 of 100 (Routine)
Henrietta	United States	Record high maximum temperature	36.1 C (97.0 F)	30 of 100 (Routine)
Ottawa Cda	Canada	Record low maximum temperature	3.5 C (38.3 F)	29 of 100 (Routine)
Boulder	United States	Record daily precipitation	37.1 mm (1.5 in)	29 of 100 (Routine)
Chatham Exp Fa	United States	Record low minimum temperature	-6.1 C (21.0 F)	29 of 100 (Routine)
Bethlehem	United States	Record low minimum temperature	-5.0 C (23.0 F)	29 of 100 (Routine)
Carlsbad	United States	Record high minimum temperature	17.2 C (63.0 F)	29 of 100 (Routine)
Kjahta	Russia	Record low minimum temperature	-9.3 C (15.3 F)	28 of 100 (Routine)
Caribou Island	Canada	Record low minimum temperature	-3.9 C (25.0 F)	27 of 100 (Routine)
Belleville	Canada	Record low minimum temperature	-2.5 C (27.5 F)	27 of 100 (Routine)
Oak Ridges	Canada	Record low minimum temperature	-6.5 C (20.3 F)	27 of 100 (Routine)
St Lin des Laurentides	Canada	Record low maximum temperature	0.0 C (32.0 F)	27 of 100 (Routine)
Chazy	United States	Record low minimum temperature	-3.9 C (25.0 F)	27 of 100 (Routine)
Old Forge	United States	Record low maximum temperature	4.4 C (39.9 F)	27 of 100 (Routine)
Seymour 3NW	United States	Record high maximum temperature	35.0 C (95.0 F)	27 of 100 (Routine)
Madawaska	Canada	Record low maximum temperature	2.0 C (35.6 F)	26 of 100 (Routine)
Disraeli	Canada	Record low maximum temperature	-2.2 C (28.0 F)	26 of 100 (Routine)
Nicolet	Canada	Record low maximum temperature	1.1 C (34.0 F)	26 of 100 (Routine)

Counts by Type and Timescale

631 records

Records set or tied on 30 April 1978 by type: Highest daily maximum 27, Lowest daily maximum 147, Highest daily minimum 82, Lowest daily minimum 175, Heaviest daily rainfall 173, Heaviest daily snowfall 24, Deepest snow cover 3.

Records on 30 April 1978 by type
Record type	Records
Highest daily maximum	27
Lowest daily maximum	147
Highest daily minimum	82
Lowest daily minimum	175
Heaviest daily rainfall	173
Heaviest daily snowfall	24
Deepest snow cover	3

Records on 30 April 1978 by timescale: all-time 2, monthly 9, daily 620.

How Much Records Were Beaten By

522 broken records

Margins by which the 522 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 190.0. Ties are not counted.

Top 20 by Significance

30 April 1978

Top 20 records on 30 April 1978 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 April 1978	Dorado 2 WNW, PR	daily rain	116.8 mm (4.6 in)	73.4 mm (2.9 in)	44 years	57 of 100 (Notable)
30 April 1978	Flagstaff (Tnk), ZA	daily rain	90.5 mm (3.6 in)	80.1 mm (3.2 in)	28 years	55 of 100 (Notable)
30 April 1978	Isachsen, CA	daily snowfall	7.3 cm (2.9 in)	5.8 cm (2.3 in)	27 years	51 of 100 (Notable)
30 April 1978	Nicolet, CA	daily snowfall	12.7 cm (5.0 in)	12.7 cm (5.0 in)	64 years	51 of 100 (Notable)
30 April 1978	Dodge City, US	all-time rain	117.9 mm (4.6 in)	12.0 mm (0.5 in)	33 years	50 of 100 (Notable)
30 April 1978	Lamar, US	daily rain	39.1 mm (1.5 in)	19.5 mm (0.8 in)	64 years	48 of 100 (Notable)
30 April 1978	Niobrara, US	daily rain	49.0 mm (1.9 in)	32.5 mm (1.3 in)	24 years	47 of 100 (Notable)
30 April 1978	Port Dover, CA	daily low min	-3.0 C (26.6 F)	1.9 C (3.4 F)	101 years	44 of 100 (Notable)
30 April 1978	Huntingdon, CA	daily low min	-5.0 C (23.0 F)	2.2 C (4.0 F)	103 years	44 of 100 (Notable)
30 April 1978	Brockville, CA	daily low max	5.0 C (41.0 F)	2.2 C (4.0 F)	101 years	43 of 100 (Notable)
30 April 1978	Montreal McGill, CA	daily low min	-4.4 C (24.1 F)	1.6 C (2.9 F)	103 years	43 of 100 (Notable)
30 April 1978	John Martin Dam, US	monthly rain	46.7 mm (1.8 in)	13.9 mm (0.5 in)	36 years	43 of 100 (Notable)
30 April 1978	Lifton Pumping STN, US	monthly rain	31.2 mm (1.2 in)	4.8 mm (0.19 in)	48 years	42 of 100 (Notable)
30 April 1978	Birobidzhan, RU	daily rain	34.0 mm (1.3 in)	18.6 mm (0.7 in)	20 years	41 of 100 (Notable)
30 April 1978	Port Stanley, CA	daily low min	-3.5 C (25.7 F)	0.7 C (1.3 F)	96 years	40 of 100 (Notable)
30 April 1978	Montreal McGill, CA	daily low max	2.8 C (37.0 F)	0.5 C (0.9 F)	103 years	40 of 100 (Notable)
30 April 1978	Mont-Aigoual, FR	daily rain	101.0 mm (4.0 in)	36.0 mm (1.4 in)	45 years	40 of 100 (Notable)
30 April 1978	Tkvarcheli, GE	daily rain	57.0 mm (2.2 in)	36.3 mm (1.4 in)	29 years	40 of 100 (Notable)
30 April 1978	Parnu, EE	daily low min	-3.8 C (25.2 F)	0.1 C (0.2 F)	96 years	39 of 100 (Notable)
30 April 1978	Richmond, CA	daily low min	-6.1 C (21.0 F)	0.5 C (0.9 F)	94 years	38 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

1795 to 1978

Records set or tied on this calendar date in each year from 1795 to 1978. 1978 had 631 records.

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

Records on 04-30 in each year
Year	Records
1795	1
1804	1
1809	1
1812	1
1814	2
1833	1
1840	1
1848	1
1850	1
1853	1
1854	1
1856	1
1859	1
1862	1
1864	1
1865	1
1866	3
1872	1
1873	1
1874	2
1876	1
1878	4
1879	2
1880	1
1881	1
1882	1
1884	1
1885	1
1886	5
1888	1
1889	1
1891	5
1892	7
1894	1
1895	5
1896	3
1897	2
1898	6
1899	11
1900	4
1901	8
1902	13
1903	21
1904	11
1905	9
1906	16
1907	35
1908	28
1909	74
1910	17
1911	19
1912	18
1913	62
1914	8
1915	20
1916	21
1917	25
1918	28
1919	130
1920	70
1921	54
1922	138
1923	42
1924	96
1925	210
1926	331
1927	127
1928	130
1929	119
1930	232
1931	548
1932	145
1933	422
1934	443
1935	327
1936	373
1937	228
1938	282
1939	268
1940	526
1941	484
1942	1,163
1943	470
1944	286
1945	314
1946	301
1947	330
1948	912
1949	447
1950	671
1951	783
1952	435
1953	635
1954	1,224
1955	1,252
1956	908
1957	401
1958	482
1959	575
1960	507
1961	381
1962	617
1963	730
1964	339
1965	488
1966	740
1967	914
1968	928
1969	587
1970	1,189
1971	365
1972	497
1973	398
1974	822
1975	468
1976	783
1977	525
1978	631
1979	675
1980	545
1981	1,342
1982	504
1983	1,154
1984	1,519
1985	650
1986	660
1987	1,437
1988	808
1989	674
1990	977
1991	828
1992	1,808
1993	765
1994	1,499
1995	1,007
1996	1,637
1997	764
1998	857
1999	1,012
2000	1,046
2001	900
2002	1,171
2003	927
2004	703
2005	1,113
2006	778
2007	996
2008	1,260
2009	660
2010	921
2011	636
2012	819
2013	732
2014	946
2015	380
2016	969
2017	1,450
2018	708
2019	700
2020	1,476
2021	1,167
2022	499
2023	782
2024	705
2025	489
2026	365

Download the Data

Data for records on 1978-04-30: 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 25	503
25 to 50	11
50 to 75	4
75 to 100	2
100 to 125	0
125 to 150	1
150 to 175	0
175 to 200	1