Weather Records on 30 April 1973

398 weather records were set or tied worldwide on 30 April 1973. Highest significance: Leo 6 SW, US.

Key Facts for 30 April 1973

On 30 April 1973, 398 weather records were set or tied at long-record stations worldwide.
86 were record highs and 102 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 13 monthly and 385 daily.
Leo 6 SW set a monthly record daily precipitation of 48.5 mm (1.9 in) on 30 April 1973.
Across 165 earlier years (1795 to 2026) the same calendar date averaged 447 records.

Record Map

398 stations

398 station records on 30 April 1973 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 30 April 1973: highest significance records shown on the map
Station	Country	Type	Value	Significance
Leo 6 SW	United States	Record daily precipitation	48.5 mm (1.9 in)	63 of 100 (Major)
Leo 6 SW	United States	Record daily snowfall	35.6 cm (14.0 in)	53 of 100 (Notable)
Porto	Portugal	Record daily precipitation	59.3 mm (2.3 in)	51 of 100 (Notable)
Wick	United Kingdom	Record daily precipitation	29.9 mm (1.2 in)	49 of 100 (Notable)
Praia Grande (Parana)	Brazil	Record daily precipitation	60.4 mm (2.4 in)	45 of 100 (Notable)
Milford	United States	Record daily snowfall	16.8 cm (6.6 in)	45 of 100 (Notable)
Lehman Caves Nm	United States	Record daily precipitation	31.5 mm (1.2 in)	43 of 100 (Notable)
Equador	Brazil	Record daily precipitation	70.0 mm (2.8 in)	42 of 100 (Notable)
Valdez WSO	United States	Record daily precipitation	33.0 mm (1.3 in)	42 of 100 (Notable)
Shamakhy	Azerbaijan	Record daily precipitation	36.4 mm (1.4 in)	41 of 100 (Notable)
Casper 2 E	United States	Record daily snowfall	28.4 cm (11.2 in)	41 of 100 (Notable)
Aquiles Serdan 46	Mexico	Record daily precipitation	28.7 mm (1.1 in)	38 of 100 (Notable)
Avalon Pleasure Pier	United States	Record low minimum temperature	3.9 C (39.0 F)	38 of 100 (Notable)
Lehman Caves Nm	United States	Record daily snowfall	30.5 cm (12.0 in)	38 of 100 (Notable)
Klipfontein	South Africa	Record daily precipitation	26.5 mm (1.0 in)	37 of 100 (Notable)
Spencer 1 N	United States	Record daily precipitation	38.9 mm (1.5 in)	37 of 100 (Notable)
Geurie Post Office	Australia	Record daily precipitation	38.4 mm (1.5 in)	36 of 100 (Notable)
Seward AP	United States	Record daily precipitation	34.0 mm (1.3 in)	36 of 100 (Notable)
Trunkey Creek (Trunkey (Black	Australia	Record daily precipitation	31.2 mm (1.2 in)	35 of 100 (Notable)
Buffalo Bill Dam	United States	Record daily snowfall	12.7 cm (5.0 in)	35 of 100 (Notable)
Dull Ctr 1SE	United States	Record daily snowfall	22.9 cm (9.0 in)	34 of 100 (Routine)
Springer	United States	Record high minimum temperature	10.0 C (50.0 F)	33 of 100 (Routine)
Beaver	United States	Record daily precipitation	48.8 mm (1.9 in)	33 of 100 (Routine)
Winterset 4N	United States	Record daily precipitation	46.2 mm (1.8 in)	32 of 100 (Routine)
Newton	United States	Record high minimum temperature	21.1 C (70.0 F)	31 of 100 (Routine)
Le Ctr 2 SE	United States	Record daily precipitation	53.6 mm (2.1 in)	31 of 100 (Routine)
Cape de Couedic	Australia	Record daily precipitation	26.4 mm (1.0 in)	30 of 100 (Routine)
Jimenez (Smn)	Mexico	Record high minimum temperature	15.6 C (60.1 F)	30 of 100 (Routine)
Lake City 2 E	United States	Record low minimum temperature	6.1 C (43.0 F)	30 of 100 (Routine)
Santander Centro	Spain	Record high maximum temperature	24.6 C (76.3 F)	29 of 100 (Routine)
Yeoval Post Office	Australia	Record daily precipitation	34.5 mm (1.4 in)	28 of 100 (Routine)
Luiz Correia	Brazil	Record daily precipitation	75.6 mm (3.0 in)	28 of 100 (Routine)
Acude Ipaguassu	Brazil	Record daily precipitation	33.8 mm (1.3 in)	28 of 100 (Routine)
Fajardo	Puerto Rico [United States]	Record low minimum temperature	17.8 C (64.0 F)	28 of 100 (Routine)
Rico	United States	Record daily snowfall	20.3 cm (8.0 in)	28 of 100 (Routine)
Okeene	United States	Record high minimum temperature	18.9 C (66.0 F)	28 of 100 (Routine)
Brodhead Wwtp	United States	Record daily precipitation	30.2 mm (1.2 in)	28 of 100 (Routine)
Lynxville Dam 9	United States	Record daily precipitation	46.7 mm (1.8 in)	28 of 100 (Routine)
Curral Novo	Brazil	Record daily precipitation	88.0 mm (3.5 in)	27 of 100 (Routine)
Sao Joao Do Sabugi	Brazil	Record daily precipitation	57.6 mm (2.3 in)	27 of 100 (Routine)
San Sebastian - Igueldo	Spain	Record high minimum temperature	15.0 C (59.0 F)	27 of 100 (Routine)
Songkhla	Thailand	Record daily precipitation	75.5 mm (3.0 in)	27 of 100 (Routine)
Dublin	United States	Record low minimum temperature	5.0 C (41.0 F)	27 of 100 (Routine)
Greenwood	United States	Record low minimum temperature	1.7 C (35.1 F)	27 of 100 (Routine)
Ft Atkinson Wwtp	United States	Record daily precipitation	34.3 mm (1.4 in)	27 of 100 (Routine)
Glenrock 5 ESE	United States	Record daily precipitation	42.7 mm (1.7 in)	27 of 100 (Routine)
Quartzsite	United States	Record low maximum temperature	21.7 C (71.1 F)	26 of 100 (Routine)
Ojai	United States	Record low maximum temperature	13.9 C (57.0 F)	26 of 100 (Routine)
Waukon 3NNE	United States	Record daily precipitation	49.5 mm (1.9 in)	26 of 100 (Routine)
Hershey 5 SSE	United States	Record daily precipitation	32.8 mm (1.3 in)	26 of 100 (Routine)
Lake Placid 2 S	United States	Record low maximum temperature	1.7 C (35.1 F)	26 of 100 (Routine)
Pagosa Springs 1SE	United States	Record daily snowfall	7.6 cm (3.0 in)	25 of 100 (Routine)
Hartwell	United States	Record low minimum temperature	4.4 C (39.9 F)	25 of 100 (Routine)
Austin Waste Wtp Facility	United States	Record daily precipitation	35.1 mm (1.4 in)	25 of 100 (Routine)
Newport 1 NW	United States	Record low maximum temperature	11.1 C (52.0 F)	25 of 100 (Routine)
Cape St Elias	United States	Record daily precipitation	47.2 mm (1.9 in)	25 of 100 (Routine)
Tamanrasset	Algeria	Record high maximum temperature	36.7 C (98.1 F)	24 of 100 (Routine)
Fazenda Sao Jeronimo	Brazil	Record daily precipitation	35.0 mm (1.4 in)	24 of 100 (Routine)
Feiticeiro	Brazil	Record daily precipitation	45.8 mm (1.8 in)	24 of 100 (Routine)
Milledgeville	United States	Record low minimum temperature	2.2 C (36.0 F)	24 of 100 (Routine)

Counts by Type and Timescale

398 records

Records set or tied on 30 April 1973 by type: Highest daily maximum 22, Lowest daily maximum 41, Highest daily minimum 64, Lowest daily minimum 61, Heaviest daily rainfall 192, Heaviest daily snowfall 17, Deepest snow cover 1.

Records on 30 April 1973 by type
Record type	Records
Highest daily maximum	22
Lowest daily maximum	41
Highest daily minimum	64
Lowest daily minimum	61
Heaviest daily rainfall	192
Heaviest daily snowfall	17
Deepest snow cover	1

Records on 30 April 1973 by timescale: all-time 0, monthly 13, daily 385.

How Much Records Were Beaten By

313 broken records

Margins by which the 313 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 305.0. Ties are not counted.

Top 20 by Significance

30 April 1973

Top 20 records on 30 April 1973 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 April 1973	Leo 6 SW, US	monthly rain	48.5 mm (1.9 in)	21.1 mm (0.8 in)	32 years	63 of 100 (Major)
30 April 1973	Leo 6 SW, US	daily snowfall	35.6 cm (14.0 in)	30.5 cm (12.0 in)	32 years	53 of 100 (Notable)
30 April 1973	Porto, PT	daily rain	59.3 mm (2.3 in)	35.3 mm (1.4 in)	32 years	51 of 100 (Notable)
30 April 1973	Wick, GB	monthly rain	29.9 mm (1.2 in)	8.1 mm (0.32 in)	20 years	49 of 100 (Notable)
30 April 1973	Praia Grande (Parana), BR	daily rain	60.4 mm (2.4 in)	43.1 mm (1.7 in)	8 years	45 of 100 (Notable)
30 April 1973	Milford, US	daily snowfall	16.8 cm (6.6 in)	9.2 cm (3.6 in)	40 years	45 of 100 (Notable)
30 April 1973	Lehman Caves Nm, US	daily rain	31.5 mm (1.2 in)	26.2 mm (1.0 in)	19 years	43 of 100 (Notable)
30 April 1973	Equador, BR	daily rain	70.0 mm (2.8 in)	49.0 mm (1.9 in)	35 years	42 of 100 (Notable)
30 April 1973	Valdez WSO, US	daily rain	33.0 mm (1.3 in)	20.6 mm (0.8 in)	43 years	42 of 100 (Notable)
30 April 1973	Shamakhy, AZ	daily rain	36.4 mm (1.4 in)	22.7 mm (0.9 in)	8 years	41 of 100 (Notable)
30 April 1973	Casper 2 E, US	daily snowfall	28.4 cm (11.2 in)	13.2 cm (5.2 in)	62 years	41 of 100 (Notable)
30 April 1973	Aquiles Serdan 46, MX	daily rain	28.7 mm (1.1 in)	16.5 mm (0.6 in)	4 years	38 of 100 (Notable)
30 April 1973	Avalon Pleasure Pier, US	daily low min	3.9 C (39.0 F)	3.3 C (5.9 F)	58 years	38 of 100 (Notable)
30 April 1973	Lehman Caves Nm, US	daily snowfall	30.5 cm (12.0 in)	30.5 cm (12.0 in)	35 years	38 of 100 (Notable)
30 April 1973	Klipfontein, ZA	daily rain	26.5 mm (1.0 in)	16.3 mm (0.6 in)	32 years	37 of 100 (Notable)
30 April 1973	Spencer 1 N, US	daily rain	38.9 mm (1.5 in)	12.2 mm (0.5 in)	52 years	37 of 100 (Notable)
30 April 1973	Geurie Post Office, AU	daily rain	38.4 mm (1.5 in)	30.3 mm (1.2 in)	10 years	36 of 100 (Notable)
30 April 1973	Seward AP, US	daily rain	34.0 mm (1.3 in)	12.7 mm (0.5 in)	64 years	36 of 100 (Notable)
30 April 1973	Trunkey Creek (Trunkey (Black, AU	daily rain	31.2 mm (1.2 in)	4.8 mm (0.19 in)	79 years	35 of 100 (Notable)
30 April 1973	Buffalo Bill Dam, US	daily snowfall	12.7 cm (5.0 in)	10.2 cm (4.0 in)	44 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

1795 to 1973

Records set or tied on this calendar date in each year from 1795 to 1973. 1973 had 398 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 1973-04-30: 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 50	303
50 to 100	4
100 to 150	2
150 to 200	1
200 to 250	1
250 to 300	0
300 to 350	2