Weather Records on 18 March 1971

405 weather records were set or tied worldwide on 18 March 1971. Highest significance: Harrison, US.

Key Facts for 18 March 1971

On 18 March 1971, 405 weather records were set or tied at long-record stations worldwide.
57 were record highs and 90 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 12 monthly and 393 daily.
Harrison set a daily record snowfall of 35.6 cm (14.0 in) on 18 March 1971.
Across 160 earlier years (1806 to 2026) the same calendar date averaged 478 records.

Record Map

405 stations

405 station records on 18 March 1971 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 March 1971: highest significance records shown on the map
Station	Country	Type	Value	Significance
Harrison	United States	Record daily snowfall	35.6 cm (14.0 in)	63 of 100 (Major)
Churchman Brook	Australia	Record daily precipitation	62.0 mm (2.4 in)	58 of 100 (Notable)
Pithara	Australia	Record daily precipitation	30.5 mm (1.2 in)	53 of 100 (Notable)
West Leichhardt Station	Australia	Record daily precipitation	60.5 mm (2.4 in)	50 of 100 (Notable)
Yanchep	Australia	Record daily precipitation	44.7 mm (1.8 in)	48 of 100 (Notable)
Malyalling	Australia	Record daily precipitation	30.0 mm (1.2 in)	48 of 100 (Notable)
Custer	United States	Record daily snowfall	25.4 cm (10.0 in)	48 of 100 (Notable)
Ogdensburg 4 NE	United States	Record snow depth	71.1 cm (28.0 in)	46 of 100 (Notable)
La Plaisante	South Africa	Record daily precipitation	39.5 mm (1.6 in)	45 of 100 (Notable)
Klaarstroom (Pol)	South Africa	Record daily precipitation	34.0 mm (1.3 in)	45 of 100 (Notable)
Plaatjies Kraal	South Africa	Record daily precipitation	54.5 mm (2.1 in)	44 of 100 (Notable)
Nelson Bay (Nelson Head)	Australia	Record daily precipitation	57.9 mm (2.3 in)	41 of 100 (Notable)
Gregory	United States	Record daily precipitation	45.2 mm (1.8 in)	41 of 100 (Notable)
Caico	Brazil	Record daily precipitation	73.0 mm (2.9 in)	39 of 100 (Notable)
Falls River	Canada	Record daily precipitation	83.8 mm (3.3 in)	38 of 100 (Notable)
Buskala Rch	United States	Record daily snowfall	30.5 cm (12.0 in)	38 of 100 (Notable)
Prairie du Sac 2 N	United States	Record daily precipitation	26.2 mm (1.0 in)	38 of 100 (Notable)
Newport	United States	Record daily snowfall	18.5 cm (7.3 in)	37 of 100 (Notable)
Oconto 4 W	United States	Record daily snowfall	12.7 cm (5.0 in)	37 of 100 (Notable)
Wheaton 3 SE	United States	Record daily snowfall	8.9 cm (3.5 in)	36 of 100 (Notable)
Miller	United States	Record daily snowfall	15.2 cm (6.0 in)	36 of 100 (Notable)
Waukesha Wwtp	United States	Record daily snowfall	27.9 cm (11.0 in)	36 of 100 (Notable)
Fort St James	Canada	Record daily snowfall	10.2 cm (4.0 in)	35 of 100 (Notable)
Purdum	United States	Record daily snowfall	25.4 cm (10.0 in)	35 of 100 (Notable)
Detroit	United States	Record low minimum temperature	-5.6 C (21.9 F)	35 of 100 (Notable)
Rondawel	South Africa	Record daily precipitation	25.5 mm (1.0 in)	34 of 100 (Routine)
Lowville	United States	Record snow depth	58.4 cm (23.0 in)	34 of 100 (Routine)
Deadwood	United States	Record daily snowfall	25.4 cm (10.0 in)	34 of 100 (Routine)
Mason City	United States	Record daily precipitation	30.5 mm (1.2 in)	33 of 100 (Routine)
Maquoketa	United States	Record daily snowfall	7.6 cm (3.0 in)	32 of 100 (Routine)
Vancouver 4 NNE	United States	Record low minimum temperature	-3.9 C (25.0 F)	32 of 100 (Routine)
Itaporanga (Misericordia)	Brazil	Record daily precipitation	82.8 mm (3.3 in)	31 of 100 (Routine)
Windom	United States	Record daily snowfall	25.4 cm (10.0 in)	31 of 100 (Routine)
Beloit	United States	Record daily snowfall	5.1 cm (2.0 in)	31 of 100 (Routine)
Racine Wwtp	United States	Record daily snowfall	10.2 cm (4.0 in)	31 of 100 (Routine)
Lumpkin 2 SE	United States	Record low minimum temperature	-2.8 C (27.0 F)	30 of 100 (Routine)
Ravenna	United States	Record daily snowfall	12.7 cm (5.0 in)	30 of 100 (Routine)
Hawthorne AP	United States	Record low minimum temperature	-7.2 C (19.0 F)	30 of 100 (Routine)
Muchea Tree Farm	Australia	Record daily precipitation	36.1 mm (1.4 in)	29 of 100 (Routine)
Finniss Springs	Australia	Record daily precipitation	30.5 mm (1.2 in)	29 of 100 (Routine)
Einasleigh Township	Australia	Record daily precipitation	31.8 mm (1.3 in)	29 of 100 (Routine)
Fort McPherson	Canada	Record high maximum temperature	0.6 C (33.1 F)	29 of 100 (Routine)
Coimbra	Portugal	Record low maximum temperature	9.8 C (49.6 F)	29 of 100 (Routine)
Longvale	South Africa	Record daily precipitation	80.8 mm (3.2 in)	29 of 100 (Routine)
Marengo	United States	Record daily snowfall	10.2 cm (4.0 in)	29 of 100 (Routine)
Humboldt 3 W	United States	Record daily snowfall	17.8 cm (7.0 in)	29 of 100 (Routine)
Primghar	United States	Record daily precipitation	27.7 mm (1.1 in)	29 of 100 (Routine)
Windom	United States	Record daily precipitation	25.7 mm (1.0 in)	29 of 100 (Routine)
Wisconsin Dells Wwtp	United States	Record daily snowfall	35.6 cm (14.0 in)	29 of 100 (Routine)
Dublin Phoenix Park	Ireland	Record daily precipitation	38.2 mm (1.5 in)	28 of 100 (Routine)
Milford 4 NW	United States	Record daily snowfall	20.8 cm (8.2 in)	28 of 100 (Routine)
Sioux Ctr 2 SE	United States	Record daily snowfall	20.3 cm (8.0 in)	28 of 100 (Routine)
Round Grove	United States	Record low minimum temperature	-20.0 C (-4.0 F)	28 of 100 (Routine)
Milwaukee Mitchell AP	United States	Record daily precipitation	29.2 mm (1.1 in)	28 of 100 (Routine)
Malbon Railway Station	Australia	Record daily precipitation	57.2 mm (2.3 in)	27 of 100 (Routine)
Heidelberg Cape (Pol)	South Africa	Record daily precipitation	49.5 mm (1.9 in)	27 of 100 (Routine)
Sac City	United States	Record daily snowfall	14.0 cm (5.5 in)	27 of 100 (Routine)
Chasm Falls	United States	Record snow depth	109.2 cm (43.0 in)	27 of 100 (Routine)
Brownsville	United States	Record high maximum temperature	32.8 C (91.0 F)	27 of 100 (Routine)
Madison Dane Co Rgnl AP	United States	Record daily snowfall	30.5 cm (12.0 in)	27 of 100 (Routine)

Counts by Type and Timescale

405 records

Records set or tied on 18 March 1971 by type: Highest daily maximum 34, Lowest daily maximum 25, Highest daily minimum 23, Lowest daily minimum 65, Heaviest daily rainfall 171, Heaviest daily snowfall 70, Deepest snow cover 17.

Records on 18 March 1971 by type
Record type	Records
Highest daily maximum	34
Lowest daily maximum	25
Highest daily minimum	23
Lowest daily minimum	65
Heaviest daily rainfall	171
Heaviest daily snowfall	70
Deepest snow cover	17

Records on 18 March 1971 by timescale: all-time 0, monthly 12, daily 393.

How Much Records Were Beaten By

337 broken records

Margins by which the 337 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 508.0. Ties are not counted.

Top 20 by Significance

18 March 1971

Top 20 records on 18 March 1971 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 March 1971	Harrison, US	daily snowfall	35.6 cm (14.0 in)	28.0 cm (11.0 in)	56 years	63 of 100 (Major)
18 March 1971	Churchman Brook, AU	daily rain	62.0 mm (2.4 in)	44.7 mm (1.8 in)	56 years	58 of 100 (Notable)
18 March 1971	Pithara, AU	daily rain	30.5 mm (1.2 in)	27.2 mm (1.1 in)	33 years	53 of 100 (Notable)
18 March 1971	West Leichhardt Station, AU	daily rain	60.5 mm (2.4 in)	49.1 mm (1.9 in)	60 years	50 of 100 (Notable)
18 March 1971	Yanchep, AU	monthly rain	44.7 mm (1.8 in)	14.7 mm (0.6 in)	28 years	48 of 100 (Notable)
18 March 1971	Malyalling, AU	daily rain	30.0 mm (1.2 in)	24.9 mm (1.0 in)	56 years	48 of 100 (Notable)
18 March 1971	Custer, US	daily snowfall	25.4 cm (10.0 in)	18.8 cm (7.4 in)	26 years	48 of 100 (Notable)
18 March 1971	Ogdensburg 4 NE, US	daily snow depth	71.1 cm (28.0 in)	27.9 cm (11.0 in)	66 years	46 of 100 (Notable)
18 March 1971	La Plaisante, ZA	daily rain	39.5 mm (1.6 in)	29.8 mm (1.2 in)	24 years	45 of 100 (Notable)
18 March 1971	Klaarstroom (Pol), ZA	daily rain	34.0 mm (1.3 in)	19.0 mm (0.7 in)	60 years	45 of 100 (Notable)
18 March 1971	Plaatjies Kraal, ZA	daily rain	54.5 mm (2.1 in)	45.5 mm (1.8 in)	4 years	44 of 100 (Notable)
18 March 1971	Nelson Bay (Nelson Head), AU	daily rain	57.9 mm (2.3 in)	19.3 mm (0.8 in)	78 years	41 of 100 (Notable)
18 March 1971	Gregory, US	monthly rain	45.2 mm (1.8 in)	12.9 mm (0.5 in)	15 years	41 of 100 (Notable)
18 March 1971	Caico, BR	daily rain	73.0 mm (2.9 in)	41.2 mm (1.6 in)	36 years	39 of 100 (Notable)
18 March 1971	Falls River, CA	daily rain	83.8 mm (3.3 in)	44.4 mm (1.7 in)	26 years	38 of 100 (Notable)
18 March 1971	Buskala Rch, US	daily snowfall	30.5 cm (12.0 in)	10.2 cm (4.0 in)	56 years	38 of 100 (Notable)
18 March 1971	Prairie du Sac 2 N, US	daily rain	26.2 mm (1.0 in)	9.7 mm (0.38 in)	48 years	38 of 100 (Notable)
18 March 1971	Newport, US	daily snowfall	18.5 cm (7.3 in)	8.3 cm (3.3 in)	56 years	37 of 100 (Notable)
18 March 1971	Oconto 4 W, US	daily snowfall	12.7 cm (5.0 in)	6.3 cm (2.5 in)	64 years	37 of 100 (Notable)
18 March 1971	Wheaton 3 SE, US	daily snowfall	8.9 cm (3.5 in)	3.8 cm (1.5 in)	74 years	36 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

1806 to 1971

Records set or tied on this calendar date in each year from 1806 to 1971. 1971 had 405 records.

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

Records on 03-18 in each year
Year	Records
1806	1
1807	1
1808	1
1810	1
1814	1
1831	1
1836	1
1839	1
1845	1
1849	1
1850	5
1853	2
1859	1
1863	1
1865	2
1867	1
1868	3
1876	1
1881	1
1882	3
1884	3
1885	1
1887	1
1888	4
1890	3
1891	3
1892	2
1893	1
1894	1
1895	2
1896	10
1897	14
1898	5
1899	8
1900	14
1901	2
1902	9
1903	22
1904	9
1905	19
1906	13
1907	11
1908	8
1909	9
1910	12
1911	17
1912	16
1913	24
1914	32
1915	30
1916	73
1917	45
1918	32
1919	25
1920	39
1921	66
1922	39
1923	262
1924	96
1925	145
1926	251
1927	376
1928	301
1929	106
1930	261
1931	167
1932	212
1933	244
1934	375
1935	87
1936	699
1937	296
1938	304
1939	750
1940	444
1941	954
1942	382
1943	603
1944	321
1945	751
1946	492
1947	328
1948	296
1949	292
1950	1,042
1951	582
1952	474
1953	218
1954	355
1955	469
1956	363
1957	374
1958	347
1959	392
1960	585
1961	579
1962	284
1963	665
1964	348
1965	1,584
1966	540
1967	1,396
1968	915
1969	601
1970	533
1971	405
1972	1,028
1973	716
1974	694
1975	614
1976	538
1977	684
1978	1,003
1979	894
1980	588
1981	570
1982	1,284
1983	1,225
1984	446
1985	731
1986	626
1987	933
1988	1,001
1989	1,147
1990	1,478
1991	706
1992	789
1993	1,683
1994	960
1995	833
1996	518
1997	1,024
1998	1,144
1999	1,051
2000	524
2001	841
2002	1,562
2003	1,425
2004	1,232
2005	1,178
2006	551
2007	1,330
2008	1,066
2009	776
2010	678
2011	993
2012	3,348
2013	783
2014	701
2015	943
2016	675
2017	1,183
2018	921
2019	666
2020	672
2021	562
2022	476
2023	890
2024	843
2025	728
2026	2,870

Download the Data

Data for records on 1971-03-18: 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 100	319
100 to 200	12
200 to 300	5
300 to 400	0
400 to 500	0
500 to 600	1