Weather Records on 15 May 1978

922 weather records were set or tied worldwide on 15 May 1978. Highest significance: Windham 3 E, US.

Key Facts for 15 May 1978

On 15 May 1978, 922 weather records were set or tied at long-record stations worldwide.
342 were record highs and 294 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 17 monthly and 905 daily.
Windham 3 E set a daily record precipitation of 48.3 mm (1.9 in) on 15 May 1978.
Across 162 earlier years (1820 to 2026) the same calendar date averaged 428 records.

Record Map

922 stations

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

Weather records on 15 May 1978: highest significance records shown on the map
Station	Country	Type	Value	Significance
Windham 3 E	United States	Record daily precipitation	48.3 mm (1.9 in)	60 of 100 (Major)
Coeur D'Alene	United States	Record daily precipitation	27.9 mm (1.1 in)	58 of 100 (Notable)
Owings Ferry Landing	United States	Record daily precipitation	71.1 mm (2.8 in)	57 of 100 (Notable)
Round Pond	United States	Record daily precipitation	106.4 mm (4.2 in)	54 of 100 (Notable)
Gouldsboro	United States	Record daily precipitation	66.0 mm (2.6 in)	54 of 100 (Notable)
Cedar Run (River)	United States	Record daily precipitation	49.5 mm (1.9 in)	50 of 100 (Notable)
Yarrie	Australia	Record daily precipitation	51.0 mm (2.0 in)	49 of 100 (Notable)
Sandpoint Exp STN	United States	Record daily precipitation	35.6 mm (1.4 in)	47 of 100 (Notable)
Greenwood Lake	United States	Record daily precipitation	66.0 mm (2.6 in)	47 of 100 (Notable)
Middleton	United States	Record daily precipitation	67.1 mm (2.6 in)	46 of 100 (Notable)
Culakkurgan	Kazakhstan	Record daily precipitation	34.8 mm (1.4 in)	45 of 100 (Notable)
Arcade	United States	Record daily precipitation	25.1 mm (1.0 in)	45 of 100 (Notable)
Illahe	United States	Record daily precipitation	45.5 mm (1.8 in)	45 of 100 (Notable)
Reedsport	United States	Record daily precipitation	46.7 mm (1.8 in)	45 of 100 (Notable)
Tullahoma	United States	Record low maximum temperature	12.2 C (54.0 F)	45 of 100 (Notable)
Pembroke	United States	Record daily precipitation	36.8 mm (1.4 in)	44 of 100 (Notable)
Mc Minnville	United States	Record low maximum temperature	11.7 C (53.1 F)	43 of 100 (Notable)
Rocksprings	United States	Record high maximum temperature	36.7 C (98.1 F)	43 of 100 (Notable)
Mad River Rs	United States	Record daily precipitation	29.0 mm (1.1 in)	41 of 100 (Notable)
Oolitic Purdue Ex Fm	United States	Record low maximum temperature	8.9 C (48.0 F)	41 of 100 (Notable)
Alcove Dam	United States	Record daily precipitation	42.4 mm (1.7 in)	41 of 100 (Notable)
Roebuck Plains	Australia	Record daily precipitation	29.0 mm (1.1 in)	40 of 100 (Notable)
Kursk	Russia	Record daily precipitation	28.4 mm (1.1 in)	40 of 100 (Notable)
College Park	United States	Record daily precipitation	53.1 mm (2.1 in)	40 of 100 (Notable)
Tavda	Russia	Record daily precipitation	25.5 mm (1.0 in)	39 of 100 (Notable)
Peterboro 2 S	United States	Record low maximum temperature	8.9 C (48.0 F)	38 of 100 (Notable)
Le Roy	United States	Record daily precipitation	28.7 mm (1.1 in)	38 of 100 (Notable)
Towanda 1 S	United States	Record daily precipitation	32.5 mm (1.3 in)	38 of 100 (Notable)
Kozhikode	India	Record daily precipitation	140.0 mm (5.5 in)	37 of 100 (Notable)
Merced	United States	Record low minimum temperature	1.7 C (35.1 F)	36 of 100 (Notable)
Ringwood	United States	Record daily precipitation	62.5 mm (2.5 in)	36 of 100 (Notable)
Ridgway	United States	Record daily precipitation	37.3 mm (1.5 in)	36 of 100 (Notable)
Tamaqua	United States	Record daily precipitation	43.9 mm (1.7 in)	36 of 100 (Notable)
Forest Glen	United States	Record daily precipitation	30.7 mm (1.2 in)	35 of 100 (Notable)
Elberton 2 N	United States	Record low maximum temperature	18.9 C (66.0 F)	35 of 100 (Notable)
Montpelier Rs	United States	Record high minimum temperature	13.3 C (55.9 F)	35 of 100 (Notable)
Midland 4 ENE	United States	Record high maximum temperature	38.3 C (100.9 F)	35 of 100 (Notable)
Bedford	United States	Record low maximum temperature	12.8 C (55.0 F)	35 of 100 (Notable)
Warsaw 2 NW	United States	Record daily precipitation	50.8 mm (2.0 in)	35 of 100 (Notable)
Karlshamn	Sweden	Record low minimum temperature	-1.3 C (29.7 F)	34 of 100 (Routine)
Cambridge City 3 N	United States	Record low maximum temperature	8.9 C (48.0 F)	34 of 100 (Routine)
Farmland 5 NNW	United States	Record low maximum temperature	9.4 C (48.9 F)	34 of 100 (Routine)
Chestertown	United States	Record low maximum temperature	14.4 C (57.9 F)	34 of 100 (Routine)
Nashua 2 NNW	United States	Record low maximum temperature	8.9 C (48.0 F)	34 of 100 (Routine)
Portsmouth-Sciotoville	United States	Record low maximum temperature	10.6 C (51.1 F)	34 of 100 (Routine)
Forest Grove	United States	Record low maximum temperature	11.1 C (52.0 F)	34 of 100 (Routine)
Mapleton Depot	United States	Record daily precipitation	49.5 mm (1.9 in)	34 of 100 (Routine)
Boscabel	Australia	Record daily precipitation	25.0 mm (1.0 in)	33 of 100 (Routine)
Cangucu	Brazil	Record daily precipitation	58.6 mm (2.3 in)	33 of 100 (Routine)
Slide Mtn	United States	Record daily precipitation	91.2 mm (3.6 in)	33 of 100 (Routine)
Dayton Mcd	United States	Record low maximum temperature	10.0 C (50.0 F)	33 of 100 (Routine)
Clearfield	United States	Record daily precipitation	68.1 mm (2.7 in)	33 of 100 (Routine)
Holtwood	United States	Record daily precipitation	28.7 mm (1.1 in)	33 of 100 (Routine)
Greeneville Exp STN	United States	Record low maximum temperature	12.8 C (55.0 F)	33 of 100 (Routine)
Asheville	United States	Record low maximum temperature	10.6 C (51.1 F)	33 of 100 (Routine)
Rome	United States	Record low maximum temperature	17.2 C (63.0 F)	32 of 100 (Routine)
Charleston	United States	Record low maximum temperature	12.8 C (55.0 F)	32 of 100 (Routine)
Effingham 3SW	United States	Record low maximum temperature	10.6 C (51.1 F)	32 of 100 (Routine)
Heber	United States	Record high minimum temperature	12.2 C (54.0 F)	32 of 100 (Routine)
Pacelma	Russia	Record daily precipitation	30.7 mm (1.2 in)	31 of 100 (Routine)

Counts by Type and Timescale

922 records

Records set or tied on 15 May 1978 by type: Highest daily maximum 224, Lowest daily maximum 235, Highest daily minimum 118, Lowest daily minimum 59, Heaviest daily rainfall 280, Heaviest daily snowfall 4, Deepest snow cover 2.

Records on 15 May 1978 by type
Record type	Records
Highest daily maximum	224
Lowest daily maximum	235
Highest daily minimum	118
Lowest daily minimum	59
Heaviest daily rainfall	280
Heaviest daily snowfall	4
Deepest snow cover	2

Records on 15 May 1978 by timescale: all-time 0, monthly 17, daily 905.

How Much Records Were Beaten By

731 broken records

Margins by which the 731 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 76.0. Ties are not counted.

Top 20 by Significance

15 May 1978

Top 20 records on 15 May 1978 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
15 May 1978	Windham 3 E, US	daily rain	48.3 mm (1.9 in)	26.5 mm (1.0 in)	73 years	60 of 100 (Major)
15 May 1978	Coeur D'Alene, US	daily rain	27.9 mm (1.1 in)	19.0 mm (0.7 in)	64 years	58 of 100 (Notable)
15 May 1978	Owings Ferry Landing, US	daily rain	71.1 mm (2.8 in)	41.4 mm (1.6 in)	44 years	57 of 100 (Notable)
15 May 1978	Round Pond, US	monthly rain	106.4 mm (4.2 in)	45.9 mm (1.8 in)	4 years	54 of 100 (Notable)
15 May 1978	Gouldsboro, US	daily rain	66.0 mm (2.6 in)	42.6 mm (1.7 in)	29 years	54 of 100 (Notable)
15 May 1978	Cedar Run (River), US	daily rain	49.5 mm (1.9 in)	25.9 mm (1.0 in)	48 years	50 of 100 (Notable)
15 May 1978	Yarrie, AU	daily rain	51.0 mm (2.0 in)	42.4 mm (1.7 in)	68 years	49 of 100 (Notable)
15 May 1978	Sandpoint Exp STN, US	daily rain	35.6 mm (1.4 in)	19.3 mm (0.8 in)	32 years	47 of 100 (Notable)
15 May 1978	Greenwood Lake, US	daily rain	66.0 mm (2.6 in)	38.8 mm (1.5 in)	31 years	47 of 100 (Notable)
15 May 1978	Middleton, US	daily rain	67.1 mm (2.6 in)	45.0 mm (1.8 in)	5 years	46 of 100 (Notable)
15 May 1978	Culakkurgan, KZ	daily rain	34.8 mm (1.4 in)	30.2 mm (1.2 in)	4 years	45 of 100 (Notable)
15 May 1978	Arcade, US	daily rain	25.1 mm (1.0 in)	9.9 mm (0.39 in)	84 years	45 of 100 (Notable)
15 May 1978	Illahe, US	daily rain	45.5 mm (1.8 in)	34.8 mm (1.4 in)	35 years	45 of 100 (Notable)
15 May 1978	Reedsport, US	daily rain	46.7 mm (1.8 in)	31.0 mm (1.2 in)	4 years	45 of 100 (Notable)
15 May 1978	Tullahoma, US	daily low max	12.2 C (54.0 F)	5.6 C (10.1 F)	80 years	45 of 100 (Notable)
15 May 1978	Pembroke, US	daily rain	36.8 mm (1.4 in)	26.4 mm (1.0 in)	51 years	44 of 100 (Notable)
15 May 1978	Mc Minnville, US	daily low max	11.7 C (53.1 F)	5.0 C (9.0 F)	80 years	43 of 100 (Notable)
15 May 1978	Rocksprings, US	daily high max	36.7 C (98.1 F)	3.9 C (7.0 F)	81 years	43 of 100 (Notable)
15 May 1978	Mad River Rs, US	daily rain	29.0 mm (1.1 in)	28.5 mm (1.1 in)	20 years	41 of 100 (Notable)
15 May 1978	Oolitic Purdue Ex Fm, US	daily low max	8.9 C (48.0 F)	5.0 C (9.0 F)	82 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

1820 to 1978

Records set or tied on this calendar date in each year from 1820 to 1978. 1978 had 922 records.

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

Records on 05-15 in each year
Year	Records
1820	1
1825	1
1831	1
1832	1
1837	2
1845	1
1847	2
1848	1
1855	2
1857	2
1859	1
1862	1
1863	1
1865	1
1866	2
1867	1
1868	2
1870	1
1871	3
1874	2
1876	4
1878	1
1879	2
1881	1
1883	1
1885	1
1886	2
1888	3
1891	3
1893	5
1894	2
1895	4
1896	2
1897	4
1898	3
1899	9
1900	9
1901	2
1902	9
1903	4
1904	13
1905	16
1906	10
1907	27
1908	25
1909	89
1910	27
1911	27
1912	26
1913	60
1914	16
1915	236
1916	27
1917	80
1918	133
1919	25
1920	58
1921	92
1922	30
1923	125
1924	174
1925	100
1926	161
1927	191
1928	144
1929	161
1930	136
1931	459
1932	368
1933	439
1934	227
1935	288
1936	372
1937	373
1938	393
1939	351
1940	179
1941	454
1942	701
1943	568
1944	630
1945	588
1946	238
1947	334
1948	264
1949	363
1950	260
1951	736
1952	476
1953	426
1954	355
1955	538
1956	466
1957	521
1958	605
1959	764
1960	291
1961	508
1962	1,128
1963	782
1964	347
1965	320
1966	389
1967	609
1968	1,019
1969	790
1970	512
1971	351
1972	484
1973	818
1974	1,230
1975	372
1976	803
1977	1,186
1978	922
1979	404
1980	625
1981	586
1982	500
1983	1,215
1984	1,059
1985	649
1986	679
1987	1,073
1988	643
1989	552
1990	776
1991	1,179
1992	944
1993	784
1994	910
1995	1,750
1996	1,452
1997	1,175
1998	1,641
1999	810
2000	850
2001	1,280
2002	801
2003	1,023
2004	1,046
2005	767
2006	955
2007	949
2008	995
2009	675
2010	1,088
2011	1,298
2012	751
2013	1,081
2014	1,411
2015	717
2016	890
2017	435
2018	1,074
2019	627
2020	472
2021	412
2022	847
2023	566
2024	596
2025	801
2026	481

Download the Data

Data for records on 1978-05-15: 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 10	644
10 to 20	57
20 to 30	16
30 to 40	5
40 to 50	7
50 to 60	1
60 to 70	0
70 to 80	1