Weather Records on 18 April 1973

953 weather records were set or tied worldwide on 18 April 1973. Highest significance: Truro, AU.

Key Facts for 18 April 1973

On 18 April 1973, 953 weather records were set or tied at long-record stations worldwide.
270 were record highs and 84 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 14 monthly and 939 daily.
Truro set a daily record precipitation of 42.4 mm (1.7 in) on 18 April 1973.
Across 160 earlier years (1793 to 2026) the same calendar date averaged 464 records.

Record Map

953 stations

953 station records on 18 April 1973 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 April 1973: highest significance records shown on the map
Station	Country	Type	Value	Significance
Truro	Australia	Record daily precipitation	42.4 mm (1.7 in)	74 of 100 (Major)
Wallaroo	Australia	Record daily precipitation	47.8 mm (1.9 in)	73 of 100 (Major)
Belair (State Flora Nursery)	Australia	Record daily precipitation	60.7 mm (2.4 in)	73 of 100 (Major)
Balaklava	Australia	Record daily precipitation	52.1 mm (2.1 in)	72 of 100 (Major)
Australia Plains	Australia	Record daily precipitation	34.5 mm (1.4 in)	68 of 100 (Major)
Hammond	United States	Record daily precipitation	129.5 mm (5.1 in)	64 of 100 (Major)
Stockwell	Australia	Record daily precipitation	31.0 mm (1.2 in)	60 of 100 (Major)
Belair (Kalyra)	Australia	Record daily precipitation	55.9 mm (2.2 in)	58 of 100 (Notable)
Bower	Australia	Record daily precipitation	31.0 mm (1.2 in)	58 of 100 (Notable)
Swan Reach	Australia	Record daily precipitation	26.4 mm (1.0 in)	58 of 100 (Notable)
Point Pass	Australia	Record daily precipitation	29.2 mm (1.1 in)	56 of 100 (Notable)
Sutherlands	Australia	Record daily precipitation	31.0 mm (1.2 in)	56 of 100 (Notable)
Kapunda	Australia	Record daily precipitation	29.5 mm (1.2 in)	55 of 100 (Notable)
Wynne	United States	Record daily precipitation	137.2 mm (5.4 in)	55 of 100 (Notable)
Monticello	United States	Record daily precipitation	119.4 mm (4.7 in)	55 of 100 (Notable)
Manila	United States	Record daily snowfall	35.6 cm (14.0 in)	55 of 100 (Notable)
Uraidla	Australia	Record daily precipitation	47.8 mm (1.9 in)	54 of 100 (Notable)
Paskeville	Australia	Record daily precipitation	56.1 mm (2.2 in)	53 of 100 (Notable)
Lyndoch	Australia	Record daily precipitation	34.8 mm (1.4 in)	53 of 100 (Notable)
Kimba	Australia	Record daily precipitation	25.7 mm (1.0 in)	52 of 100 (Notable)
Auburn	Australia	Record daily precipitation	30.5 mm (1.2 in)	52 of 100 (Notable)
Tarlee	Australia	Record daily precipitation	34.8 mm (1.4 in)	52 of 100 (Notable)
Blackwood Post Office	Australia	Record daily precipitation	47.0 mm (1.9 in)	52 of 100 (Notable)
Morgan City	United States	Record daily precipitation	198.4 mm (7.8 in)	52 of 100 (Notable)
Kanmantoo	Australia	Record daily precipitation	25.4 mm (1.0 in)	51 of 100 (Notable)
Adelaide (Unley)	Australia	Record daily precipitation	40.1 mm (1.6 in)	50 of 100 (Notable)
Adelaide (Waite Institute)	Australia	Record daily precipitation	39.4 mm (1.6 in)	50 of 100 (Notable)
Struishoek	South Africa	Record daily precipitation	55.0 mm (2.2 in)	50 of 100 (Notable)
Clare Post Office	Australia	Record daily precipitation	35.6 mm (1.4 in)	49 of 100 (Notable)
Farrell Flat	Australia	Record daily precipitation	26.7 mm (1.1 in)	49 of 100 (Notable)
Tintinara	Australia	Record daily precipitation	28.2 mm (1.1 in)	49 of 100 (Notable)
Cleve (Mangalo)	Australia	Record daily precipitation	33.5 mm (1.3 in)	48 of 100 (Notable)
Ardrossan (Winulta)	Australia	Record daily precipitation	27.4 mm (1.1 in)	48 of 100 (Notable)
Katberg (Bos)	South Africa	Record daily precipitation	31.0 mm (1.2 in)	48 of 100 (Notable)
Brinkworth (Bungaree)	Australia	Record daily precipitation	28.4 mm (1.1 in)	46 of 100 (Notable)
Clare (Hill River)	Australia	Record daily precipitation	40.9 mm (1.6 in)	46 of 100 (Notable)
Rosedale	United States	Record daily precipitation	66.8 mm (2.6 in)	46 of 100 (Notable)
Angleton 2 W	United States	Record daily precipitation	109.2 mm (4.3 in)	46 of 100 (Notable)
Deer Creek Dam	United States	Record daily precipitation	37.6 mm (1.5 in)	46 of 100 (Notable)
Manila	United States	Record daily precipitation	36.8 mm (1.4 in)	46 of 100 (Notable)
Riverton	Australia	Record daily precipitation	25.7 mm (1.0 in)	45 of 100 (Notable)
Petropavlovsk-Kamchatskij	Russia	Record daily precipitation	40.9 mm (1.6 in)	45 of 100 (Notable)
Newark Liberty Intl AP	United States	Record high minimum temperature	16.1 C (61.0 F)	45 of 100 (Notable)
Svetlograd	Russia	Record daily precipitation	28.3 mm (1.1 in)	44 of 100 (Notable)
Anahuac	United States	Record daily precipitation	137.2 mm (5.4 in)	44 of 100 (Notable)
Manoora	Australia	Record daily precipitation	25.9 mm (1.0 in)	43 of 100 (Notable)
Columbia	United States	Record daily precipitation	111.8 mm (4.4 in)	43 of 100 (Notable)
Biskra	Algeria	Record low maximum temperature	13.0 C (55.4 F)	42 of 100 (Notable)
Mintaro	Australia	Record daily precipitation	27.9 mm (1.1 in)	42 of 100 (Notable)
Marrabel	Australia	Record daily precipitation	26.4 mm (1.0 in)	42 of 100 (Notable)
Netherton (Desert Fringe)	Australia	Record daily precipitation	29.0 mm (1.1 in)	42 of 100 (Notable)
Myton	United States	Record daily precipitation	29.7 mm (1.2 in)	42 of 100 (Notable)
Ouagadougou	Burkina Faso	Record daily precipitation	57.5 mm (2.3 in)	42 of 100 (Notable)
Cowell	Australia	Record daily precipitation	28.2 mm (1.1 in)	41 of 100 (Notable)
Quaggasdrift	South Africa	Record daily precipitation	42.0 mm (1.7 in)	41 of 100 (Notable)
Greenock	Australia	Record daily precipitation	25.4 mm (1.0 in)	40 of 100 (Notable)
Stonyfell	Australia	Record daily precipitation	36.8 mm (1.4 in)	40 of 100 (Notable)
Port Hastings	Canada	Record high minimum temperature	7.8 C (46.0 F)	40 of 100 (Notable)
Clare (Emu Flat)	Australia	Record daily precipitation	34.0 mm (1.3 in)	38 of 100 (Notable)
Bute (Ninnes)	Australia	Record daily precipitation	29.2 mm (1.1 in)	38 of 100 (Notable)

Counts by Type and Timescale

953 records

Records set or tied on 18 April 1973 by type: Highest daily maximum 127, Lowest daily maximum 65, Highest daily minimum 143, Lowest daily minimum 19, Heaviest daily rainfall 561, Heaviest daily snowfall 31, Deepest snow cover 7.

Records on 18 April 1973 by type
Record type	Records
Highest daily maximum	127
Lowest daily maximum	65
Highest daily minimum	143
Lowest daily minimum	19
Heaviest daily rainfall	561
Heaviest daily snowfall	31
Deepest snow cover	7

Records on 18 April 1973 by timescale: all-time 0, monthly 14, daily 939.

How Much Records Were Beaten By

862 broken records

Margins by which the 862 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

18 April 1973

Top 20 records on 18 April 1973 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 April 1973	Truro, AU	daily rain	42.4 mm (1.7 in)	35.5 mm (1.4 in)	83 years	74 of 100 (Major)
18 April 1973	Wallaroo, AU	daily rain	47.8 mm (1.9 in)	29.5 mm (1.2 in)	77 years	73 of 100 (Major)
18 April 1973	Belair (State Flora Nursery), AU	daily rain	60.7 mm (2.4 in)	38.3 mm (1.5 in)	83 years	73 of 100 (Major)
18 April 1973	Balaklava, AU	daily rain	52.1 mm (2.1 in)	31.5 mm (1.2 in)	77 years	72 of 100 (Major)
18 April 1973	Australia Plains, AU	daily rain	34.5 mm (1.4 in)	22.3 mm (0.9 in)	78 years	68 of 100 (Major)
18 April 1973	Hammond, US	daily rain	129.5 mm (5.1 in)	88.9 mm (3.5 in)	59 years	64 of 100 (Major)
18 April 1973	Stockwell, AU	daily rain	31.0 mm (1.2 in)	22.1 mm (0.9 in)	83 years	60 of 100 (Major)
18 April 1973	Belair (Kalyra), AU	daily rain	55.9 mm (2.2 in)	33.0 mm (1.3 in)	52 years	58 of 100 (Notable)
18 April 1973	Bower, AU	daily rain	31.0 mm (1.2 in)	27.2 mm (1.1 in)	38 years	58 of 100 (Notable)
18 April 1973	Swan Reach, AU	daily rain	26.4 mm (1.0 in)	23.6 mm (0.9 in)	39 years	58 of 100 (Notable)
18 April 1973	Point Pass, AU	daily rain	29.2 mm (1.1 in)	24.6 mm (1.0 in)	36 years	56 of 100 (Notable)
18 April 1973	Sutherlands, AU	daily rain	31.0 mm (1.2 in)	28.0 mm (1.1 in)	32 years	56 of 100 (Notable)
18 April 1973	Kapunda, AU	daily rain	29.5 mm (1.2 in)	18.1 mm (0.7 in)	77 years	55 of 100 (Notable)
18 April 1973	Wynne, US	daily rain	137.2 mm (5.4 in)	78.8 mm (3.1 in)	32 years	55 of 100 (Notable)
18 April 1973	Monticello, US	daily rain	119.4 mm (4.7 in)	92.5 mm (3.6 in)	30 years	55 of 100 (Notable)
18 April 1973	Manila, US	daily snowfall	35.6 cm (14.0 in)	30.5 cm (12.0 in)	56 years	55 of 100 (Notable)
18 April 1973	Uraidla, AU	daily rain	47.8 mm (1.9 in)	25.7 mm (1.0 in)	74 years	54 of 100 (Notable)
18 April 1973	Paskeville, AU	monthly rain	56.1 mm (2.2 in)	6.8 mm (0.27 in)	84 years	53 of 100 (Notable)
18 April 1973	Lyndoch, AU	daily rain	34.8 mm (1.4 in)	19.3 mm (0.8 in)	77 years	53 of 100 (Notable)
18 April 1973	Kimba, AU	daily rain	25.7 mm (1.0 in)	22.9 mm (0.9 in)	38 years	52 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

1793 to 1973

Records set or tied on this calendar date in each year from 1793 to 1973. 1973 had 953 records.

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

Records on 04-18 in each year
Year	Records
1793	1
1807	2
1815	1
1838	1
1847	1
1849	1
1851	1
1852	3
1854	3
1855	1
1865	4
1867	1
1870	1
1871	1
1875	4
1877	2
1878	1
1879	3
1880	2
1884	2
1886	2
1887	3
1888	1
1889	1
1890	2
1891	1
1892	3
1893	5
1894	7
1895	2
1896	3
1897	5
1898	8
1899	2
1900	2
1901	6
1902	5
1903	11
1904	9
1905	12
1906	18
1907	17
1908	37
1909	19
1910	19
1911	25
1912	21
1913	26
1914	38
1915	31
1916	22
1917	40
1918	76
1919	16
1920	64
1921	58
1922	85
1923	107
1924	101
1925	154
1926	322
1927	391
1928	323
1929	126
1930	113
1931	173
1932	326
1933	211
1934	391
1935	264
1936	483
1937	477
1938	711
1939	525
1940	322
1941	496
1942	287
1943	298
1944	259
1945	371
1946	357
1947	444
1948	932
1949	345
1950	244
1951	658
1952	536
1953	1,322
1954	442
1955	817
1956	467
1957	629
1958	370
1959	468
1960	320
1961	520
1962	484
1963	662
1964	449
1965	363
1966	776
1967	882
1968	867
1969	795
1970	771
1971	1,106
1972	470
1973	953
1974	326
1975	751
1976	1,309
1977	717
1978	803
1979	841
1980	842
1981	708
1982	616
1983	2,082
1984	625
1985	1,119
1986	622
1987	1,068
1988	936
1989	625
1990	1,368
1991	780
1992	702
1993	730
1994	1,218
1995	1,601
1996	826
1997	1,256
1998	1,011
1999	1,428
2000	912
2001	1,487
2002	2,084
2003	969
2004	846
2005	622
2006	1,262
2007	675
2008	913
2009	624
2010	478
2011	1,122
2012	744
2013	2,509
2014	534
2015	519
2016	973
2017	588
2018	1,202
2019	601
2020	770
2021	592
2022	1,013
2023	739
2024	641
2025	997
2026	498

Download the Data

Data for records on 1973-04-18: 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	836
50 to 100	20
100 to 150	2
150 to 200	2
200 to 250	1
250 to 300	0
300 to 350	1