Weather Records on 15 April 1978

426 weather records were set or tied worldwide on 15 April 1978. Highest significance: Port Alfred, ZA.

Key Facts for 15 April 1978

On 15 April 1978, 426 weather records were set or tied at long-record stations worldwide.
71 were record highs and 112 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 7 monthly and 419 daily.
Port Alfred set a daily record precipitation of 45.0 mm (1.8 in) on 15 April 1978.
Across 159 earlier years (1801 to 2026) the same calendar date averaged 493 records.

Record Map

426 stations

426 station records on 15 April 1978 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 15 April 1978: highest significance records shown on the map
Station	Country	Type	Value	Significance
Port Alfred	South Africa	Record daily precipitation	45.0 mm (1.8 in)	53 of 100 (Notable)
Pecs Pogany	Hungary	Record daily precipitation	37.1 mm (1.5 in)	51 of 100 (Notable)
Napa State Hospital	United States	Record daily precipitation	38.1 mm (1.5 in)	47 of 100 (Notable)
Yarraloola	Australia	Record daily precipitation	28.2 mm (1.1 in)	45 of 100 (Notable)
Sonoma	United States	Record daily precipitation	31.2 mm (1.2 in)	44 of 100 (Notable)
Roetgen	Germany	Record snow depth	14.0 cm (5.5 in)	43 of 100 (Notable)
Nenastnaja	Russia	Record daily precipitation	34.5 mm (1.4 in)	43 of 100 (Notable)
Half Moon Bay	United States	Record daily precipitation	47.8 mm (1.9 in)	43 of 100 (Notable)
Priest Valley	United States	Record daily precipitation	40.1 mm (1.6 in)	41 of 100 (Notable)
Tuxcueca	Mexico	Record high maximum temperature	38.9 C (102.0 F)	40 of 100 (Notable)
Idalia	South Africa	Record daily precipitation	55.0 mm (2.2 in)	40 of 100 (Notable)
Red Bluff Muni AP	United States	Record daily precipitation	25.4 mm (1.0 in)	39 of 100 (Notable)
Monterey	United States	Record daily precipitation	31.8 mm (1.3 in)	38 of 100 (Notable)
Col du Grand St-Bernard	Switzerland	Record low maximum temperature	-8.1 C (17.4 F)	37 of 100 (Notable)
Ballina (Crowley Village)	Australia	Record daily precipitation	59.0 mm (2.3 in)	36 of 100 (Notable)
Itaete (Iguacu)	Brazil	Record daily precipitation	48.2 mm (1.9 in)	36 of 100 (Notable)
Catemaco	Mexico	Record low minimum temperature	8.9 C (48.0 F)	36 of 100 (Notable)
Lechuza Ptrl St Fc352B	United States	Record daily precipitation	37.3 mm (1.5 in)	36 of 100 (Notable)
San Francisco Dwtn	United States	Record daily precipitation	29.2 mm (1.1 in)	36 of 100 (Notable)
Kall-Sistig	Germany	Record snow depth	14.0 cm (5.5 in)	35 of 100 (Notable)
Muir Woods	United States	Record daily precipitation	41.1 mm (1.6 in)	35 of 100 (Notable)
San Mateo	United States	Record daily precipitation	27.9 mm (1.1 in)	34 of 100 (Routine)
Paso Robles Muni AP	United States	Record daily precipitation	28.4 mm (1.1 in)	34 of 100 (Routine)
Olenja Rechka	Russia	Record daily precipitation	30.6 mm (1.2 in)	33 of 100 (Routine)
Forest Grove	United States	Record low maximum temperature	8.9 C (48.0 F)	33 of 100 (Routine)
Paso Robles	United States	Record daily precipitation	26.7 mm (1.1 in)	31 of 100 (Routine)
Van Nuys Fc15A	United States	Record daily precipitation	34.5 mm (1.4 in)	30 of 100 (Routine)
Santa Barbara Muni AP	United States	Record daily precipitation	25.1 mm (1.0 in)	30 of 100 (Routine)
Oakland Intl AP	United States	Record daily precipitation	27.2 mm (1.1 in)	30 of 100 (Routine)
Berkeley	United States	Record daily precipitation	34.0 mm (1.3 in)	29 of 100 (Routine)
Wandering Comparison	Australia	Record high minimum temperature	17.4 C (63.3 F)	28 of 100 (Routine)
Petaluma AP	United States	Record low maximum temperature	11.1 C (52.0 F)	28 of 100 (Routine)
Old Forge	United States	Record daily snowfall	10.2 cm (4.0 in)	28 of 100 (Routine)
Hatton 9 SE	United States	Record high minimum temperature	8.9 C (48.0 F)	28 of 100 (Routine)
Kellogg	United States	Record high minimum temperature	6.7 C (44.1 F)	27 of 100 (Routine)
Moyoguarda	Mexico	Record high maximum temperature	31.7 C (89.1 F)	26 of 100 (Routine)
Tonti (Bos)	South Africa	Record daily precipitation	36.0 mm (1.4 in)	26 of 100 (Routine)
Omak 4 N	United States	Record low maximum temperature	8.3 C (46.9 F)	26 of 100 (Routine)
El Toro MCAS	United States	Record daily precipitation	25.7 mm (1.0 in)	26 of 100 (Routine)
Jakutsk	Russia	Record high minimum temperature	1.1 C (34.0 F)	25 of 100 (Routine)
Humansdorp (Pol)	South Africa	Record daily precipitation	38.6 mm (1.5 in)	25 of 100 (Routine)
Frasers	South Africa	Record daily precipitation	46.5 mm (1.8 in)	25 of 100 (Routine)
Altadena	United States	Record daily precipitation	36.6 mm (1.4 in)	25 of 100 (Routine)
Covelo	United States	Record daily precipitation	25.4 mm (1.0 in)	25 of 100 (Routine)
Russell Springs	United States	Record low maximum temperature	10.0 C (50.0 F)	25 of 100 (Routine)
Salinas AP	United States	Record daily precipitation	26.7 mm (1.1 in)	25 of 100 (Routine)
The Warriups	Australia	Record daily precipitation	35.4 mm (1.4 in)	24 of 100 (Routine)
Ojai	United States	Record low maximum temperature	13.9 C (57.0 F)	24 of 100 (Routine)
Merredin Research Station	Australia	Record high minimum temperature	18.3 C (64.9 F)	23 of 100 (Routine)
Gander Int'l A	Canada	Record daily snowfall	13.7 cm (5.4 in)	23 of 100 (Routine)
St John's A	Canada	Record daily snowfall	31.6 cm (12.4 in)	23 of 100 (Routine)
N'Guigni	Niger	Record high minimum temperature	29.0 C (84.2 F)	23 of 100 (Routine)
San Francisco Intl AP	United States	Record daily precipitation	25.9 mm (1.0 in)	23 of 100 (Routine)
Jakutsk	Russia	Record high maximum temperature	10.0 C (50.0 F)	22 of 100 (Routine)
Paloma	United States	Record daily precipitation	32.5 mm (1.3 in)	22 of 100 (Routine)
Perpignan	France	Record low maximum temperature	9.8 C (49.6 F)	21 of 100 (Routine)
Ljubljana Bezigrad	Slovenia	Record low maximum temperature	5.4 C (41.7 F)	21 of 100 (Routine)
La Crescenta Fc251 C	United States	Record daily precipitation	39.4 mm (1.6 in)	21 of 100 (Routine)
Alameda NAS	United States	Record daily precipitation	25.1 mm (1.0 in)	21 of 100 (Routine)
Powell River	Canada	Record daily precipitation	20.8 mm (0.8 in)	20 of 100 (Routine)

Counts by Type and Timescale

426 records

Records set or tied on 15 April 1978 by type: Highest daily maximum 31, Lowest daily maximum 76, Highest daily minimum 40, Lowest daily minimum 36, Heaviest daily rainfall 216, Heaviest daily snowfall 17, Deepest snow cover 10.

Records on 15 April 1978 by type
Record type	Records
Highest daily maximum	31
Lowest daily maximum	76
Highest daily minimum	40
Lowest daily minimum	36
Heaviest daily rainfall	216
Heaviest daily snowfall	17
Deepest snow cover	10

Records on 15 April 1978 by timescale: all-time 0, monthly 7, daily 419.

How Much Records Were Beaten By

361 broken records

Margins by which the 361 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 183.0. Ties are not counted.

Top 20 by Significance

15 April 1978

Top 20 records on 15 April 1978 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
15 April 1978	Port Alfred, ZA	daily rain	45.0 mm (1.8 in)	22.1 mm (0.9 in)	77 years	53 of 100 (Notable)
15 April 1978	Pecs Pogany, HU	daily rain	37.1 mm (1.5 in)	22.0 mm (0.9 in)	43 years	51 of 100 (Notable)
15 April 1978	Napa State Hospital, US	daily rain	38.1 mm (1.5 in)	25.4 mm (1.0 in)	43 years	47 of 100 (Notable)
15 April 1978	Yarraloola, AU	daily rain	28.2 mm (1.1 in)	28.2 mm (1.1 in)	76 years	45 of 100 (Notable)
15 April 1978	Sonoma, US	daily rain	31.2 mm (1.2 in)	16.2 mm (0.6 in)	72 years	44 of 100 (Notable)
15 April 1978	Roetgen, DE	daily snow depth	14.0 cm (5.5 in)	12.0 cm (4.7 in)	0 years	43 of 100 (Notable)
15 April 1978	Nenastnaja, RU	daily rain	34.5 mm (1.4 in)	18.1 mm (0.7 in)	40 years	43 of 100 (Notable)
15 April 1978	Half Moon Bay, US	daily rain	47.8 mm (1.9 in)	34.1 mm (1.3 in)	11 years	43 of 100 (Notable)
15 April 1978	Priest Valley, US	daily rain	40.1 mm (1.6 in)	31.2 mm (1.2 in)	15 years	41 of 100 (Notable)
15 April 1978	Tuxcueca, MX	daily high max	38.9 C (102.0 F)	7.8 C (14.0 F)	21 years	40 of 100 (Notable)
15 April 1978	Idalia, ZA	daily rain	55.0 mm (2.2 in)	42.0 mm (1.7 in)	5 years	40 of 100 (Notable)
15 April 1978	Red Bluff Muni AP, US	daily rain	25.4 mm (1.0 in)	7.1 mm (0.28 in)	73 years	39 of 100 (Notable)
15 April 1978	Monterey, US	daily rain	31.8 mm (1.3 in)	22.9 mm (0.9 in)	11 years	38 of 100 (Notable)
15 April 1978	Col du Grand St-Bernard, CH	daily low max	-8.1 C (17.4 F)	0.5 C (0.9 F)	86 years	37 of 100 (Notable)
15 April 1978	Ballina (Crowley Village), AU	daily rain	59.0 mm (2.3 in)	13.3 mm (0.5 in)	73 years	36 of 100 (Notable)
15 April 1978	Itaete (Iguacu), BR	daily rain	48.2 mm (1.9 in)	22.7 mm (0.9 in)	40 years	36 of 100 (Notable)
15 April 1978	Catemaco, MX	daily low min	8.9 C (48.0 F)	6.7 C (12.1 F)	19 years	36 of 100 (Notable)
15 April 1978	Lechuza Ptrl St Fc352B, US	daily rain	37.3 mm (1.5 in)	35.8 mm (1.4 in)	15 years	36 of 100 (Notable)
15 April 1978	San Francisco Dwtn, US	daily rain	29.2 mm (1.1 in)	17.0 mm (0.7 in)	43 years	36 of 100 (Notable)
15 April 1978	Kall-Sistig, DE	monthly snow depth	14.0 cm (5.5 in)	4.0 cm (1.6 in)	8 years	35 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

1801 to 1978

Records set or tied on this calendar date in each year from 1801 to 1978. 1978 had 426 records.

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

Records on 04-15 in each year
Year	Records
1801	1
1817	1
1820	1
1844	1
1845	1
1847	1
1849	1
1853	2
1855	2
1858	1
1862	3
1865	3
1866	1
1868	1
1869	2
1873	1
1874	1
1876	1
1880	1
1882	1
1885	3
1886	1
1887	3
1889	2
1890	3
1891	2
1892	8
1893	2
1894	1
1896	2
1897	1
1898	2
1899	4
1900	9
1901	2
1902	4
1903	8
1904	39
1905	11
1906	20
1907	18
1908	15
1909	18
1910	16
1911	20
1912	24
1913	39
1914	17
1915	13
1916	15
1917	35
1918	40
1919	22
1920	50
1921	59
1922	94
1923	178
1924	172
1925	168
1926	453
1927	321
1928	631
1929	91
1930	289
1931	388
1932	150
1933	300
1934	339
1935	515
1936	439
1937	277
1938	596
1939	789
1940	581
1941	628
1942	525
1943	1,037
1944	313
1945	783
1946	245
1947	532
1948	306
1949	419
1950	568
1951	504
1952	357
1953	475
1954	896
1955	484
1956	750
1957	378
1958	458
1959	314
1960	319
1961	877
1962	733
1963	714
1964	382
1965	504
1966	464
1967	599
1968	476
1969	555
1970	841
1971	640
1972	896
1973	667
1974	385
1975	780
1976	1,566
1977	649
1978	426
1979	370
1980	1,066
1981	724
1982	955
1983	1,343
1984	612
1985	788
1986	1,140
1987	579
1988	839
1989	836
1990	837
1991	769
1992	783
1993	1,156
1994	835
1995	805
1996	1,173
1997	1,031
1998	1,752
1999	1,249
2000	1,163
2001	1,043
2002	1,866
2003	1,760
2004	761
2005	583
2006	1,637
2007	1,776
2008	1,157
2009	853
2010	804
2011	1,162
2012	1,007
2013	1,146
2014	1,721
2015	739
2016	602
2017	474
2018	1,913
2019	610
2020	1,068
2021	494
2022	1,145
2023	912
2024	1,096
2025	860
2026	1,118

Download the Data

Data for records on 1978-04-15: 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	340
25 to 50	15
50 to 75	1
75 to 100	2
100 to 125	2
125 to 150	0
150 to 175	0
175 to 200	1