Weather Records on 21 September 1970

708 weather records were set or tied worldwide on 21 September 1970. Highest significance: Ooldea Railway, AU.

Key Facts for 21 September 1970

On 21 September 1970, 708 weather records were set or tied at long-record stations worldwide.
285 were record highs and 51 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 19 monthly and 688 daily.
Ooldea Railway set an all-time record daily precipitation of 80.0 mm (3.1 in) on 21 September 1970.
Across 155 earlier years (1805 to 2026) the same calendar date averaged 449 records.

Record Map

708 stations

708 station records on 21 September 1970 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 September 1970: highest significance records shown on the map
Station	Country	Type	Value	Significance
Ooldea Railway	Australia	Record daily precipitation	80.0 mm (3.1 in)	68 of 100 (Major)
Anna Creek	Australia	Record daily precipitation	33.3 mm (1.3 in)	60 of 100 (Major)
Grong Grong (Berembed)	Australia	Record daily precipitation	40.6 mm (1.6 in)	60 of 100 (Major)
Mayo A	Canada	Record daily snowfall	24.9 cm (9.8 in)	56 of 100 (Notable)
Deakin	Australia	Record daily precipitation	66.0 mm (2.6 in)	55 of 100 (Notable)
Mundrabilla Station	Australia	Record daily precipitation	29.0 mm (1.1 in)	53 of 100 (Notable)
Russell	Canada	Record daily precipitation	26.7 mm (1.1 in)	52 of 100 (Notable)
Grand Marais	United States	Record daily precipitation	66.3 mm (2.6 in)	52 of 100 (Notable)
Tambellup	Australia	Record daily precipitation	59.7 mm (2.4 in)	50 of 100 (Notable)
Cuballing	Australia	Record daily precipitation	29.7 mm (1.2 in)	49 of 100 (Notable)
Kulin	Australia	Record daily precipitation	25.9 mm (1.0 in)	49 of 100 (Notable)
Lightning Ridge (Guiseley)	Australia	Record daily precipitation	76.2 mm (3.0 in)	49 of 100 (Notable)
Guadalajara (Dge)	Mexico	Record daily precipitation	65.3 mm (2.6 in)	48 of 100 (Notable)
Turocak	Russia	Record daily precipitation	37.0 mm (1.5 in)	48 of 100 (Notable)
Darlington Point (Tubbo Well)	Australia	Record daily precipitation	45.7 mm (1.8 in)	45 of 100 (Notable)
Coober Pedy	Australia	Record daily precipitation	29.7 mm (1.2 in)	44 of 100 (Notable)
Darlington Point (Tubbo)	Australia	Record daily precipitation	45.7 mm (1.8 in)	44 of 100 (Notable)
Isis Downs	Australia	Record daily precipitation	30.2 mm (1.2 in)	42 of 100 (Notable)
Mackinaw City 2	United States	Record daily precipitation	70.6 mm (2.8 in)	42 of 100 (Notable)
Yellanup	Australia	Record daily precipitation	33.8 mm (1.3 in)	41 of 100 (Notable)
Cootamundra (Landgrove)	Australia	Record daily precipitation	33.0 mm (1.3 in)	41 of 100 (Notable)
Kyzyl-Ozek	Russia	Record daily precipitation	39.0 mm (1.5 in)	41 of 100 (Notable)
Aspen	United States	Record daily snowfall	6.6 cm (2.6 in)	41 of 100 (Notable)
Rhinelander	United States	Record daily precipitation	53.8 mm (2.1 in)	41 of 100 (Notable)
Midland	Australia	Record daily precipitation	33.5 mm (1.3 in)	40 of 100 (Notable)
Toolamba	Australia	Record daily precipitation	34.0 mm (1.3 in)	40 of 100 (Notable)
Kalyandrug	India	Record daily precipitation	83.0 mm (3.3 in)	40 of 100 (Notable)
Gingin	Australia	Record daily precipitation	29.7 mm (1.2 in)	38 of 100 (Notable)
Pundi	India	Record daily precipitation	63.5 mm (2.5 in)	38 of 100 (Notable)
Angledool (Angledool Station)	Australia	Record daily precipitation	59.4 mm (2.3 in)	37 of 100 (Notable)
Emerald Post Office	Australia	Record low maximum temperature	21.6 C (70.9 F)	36 of 100 (Notable)
Queanbeyan (Mount Campbell)	Australia	Record daily precipitation	33.0 mm (1.3 in)	36 of 100 (Notable)
River Jordan	Canada	Record daily precipitation	70.1 mm (2.8 in)	36 of 100 (Notable)
Lawrence	United States	Record high minimum temperature	23.3 C (73.9 F)	36 of 100 (Notable)
Chatham Exp Fa	United States	Record daily precipitation	50.5 mm (2.0 in)	36 of 100 (Notable)
Sault Ste Marie Sanderson Fld	United States	Record daily precipitation	54.4 mm (2.1 in)	36 of 100 (Notable)
Binya Post Office	Australia	Record daily precipitation	33.8 mm (1.3 in)	35 of 100 (Notable)
Uardry (Oolambeyan)	Australia	Record daily precipitation	35.1 mm (1.4 in)	35 of 100 (Notable)
Detroit Lakes 1 NNE	United States	Record daily precipitation	49.0 mm (1.9 in)	35 of 100 (Notable)
Mahnomen	United States	Record daily precipitation	41.9 mm (1.6 in)	35 of 100 (Notable)
Birtle	Canada	Record daily precipitation	35.6 mm (1.4 in)	34 of 100 (Routine)
Belthangady	India	Record daily precipitation	83.4 mm (3.3 in)	34 of 100 (Routine)
Itasca UNIV of Minn	United States	Record daily precipitation	59.4 mm (2.3 in)	34 of 100 (Routine)
Oak Park	Australia	Record daily precipitation	25.1 mm (1.0 in)	33 of 100 (Routine)
Dartnall	Australia	Record daily precipitation	40.1 mm (1.6 in)	33 of 100 (Routine)
Walgett Council Depot	Australia	Record low maximum temperature	14.4 C (57.9 F)	33 of 100 (Routine)
Barraba (Mount Lindsay)	Australia	Record daily precipitation	48.0 mm (1.9 in)	33 of 100 (Routine)
Fazenda Barreirinho	Brazil	Record daily precipitation	39.0 mm (1.5 in)	33 of 100 (Routine)
Patan	India	Record daily precipitation	50.7 mm (2.0 in)	33 of 100 (Routine)
Chernjaevo	Russia	Record daily precipitation	36.9 mm (1.5 in)	33 of 100 (Routine)
Mattoon	United States	Record high minimum temperature	21.1 C (70.0 F)	33 of 100 (Routine)
Knoxville	United States	Record high minimum temperature	22.2 C (72.0 F)	33 of 100 (Routine)
Mt Ayr	United States	Record high minimum temperature	21.7 C (71.1 F)	33 of 100 (Routine)
New Iberia AP - Acadiana Rgnl	United States	Record daily precipitation	33.5 mm (1.3 in)	33 of 100 (Routine)
Newberry-Luce Co Rd Commission	United States	Record daily precipitation	71.4 mm (2.8 in)	33 of 100 (Routine)
Caledonia	United States	Record high minimum temperature	20.0 C (68.0 F)	33 of 100 (Routine)
Kirksville	United States	Record high minimum temperature	23.3 C (73.9 F)	33 of 100 (Routine)
Medford	United States	Record daily precipitation	32.5 mm (1.3 in)	33 of 100 (Routine)
Marshall	United States	Record high minimum temperature	22.8 C (73.0 F)	33 of 100 (Routine)
East Angus	Canada	Record daily precipitation	69.1 mm (2.7 in)	32 of 100 (Routine)

Counts by Type and Timescale

708 records

Records set or tied on 21 September 1970 by type: Highest daily maximum 43, Lowest daily maximum 23, Highest daily minimum 242, Lowest daily minimum 28, Heaviest daily rainfall 365, Heaviest daily snowfall 7.

Records on 21 September 1970 by type
Record type	Records
Highest daily maximum	43
Lowest daily maximum	23
Highest daily minimum	242
Lowest daily minimum	28
Heaviest daily rainfall	365
Heaviest daily snowfall	7
Deepest snow cover	0

Records on 21 September 1970 by timescale: all-time 1, monthly 19, daily 688.

How Much Records Were Beaten By

564 broken records

Margins by which the 564 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 163.0. Ties are not counted.

Top 20 by Significance

21 September 1970

Top 20 records on 21 September 1970 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 September 1970	Ooldea Railway, AU	all-time rain	80.0 mm (3.1 in)	23.6 mm (0.9 in)	12 years	68 of 100 (Major)
21 September 1970	Anna Creek, AU	monthly rain	33.3 mm (1.3 in)	11.5 mm (0.5 in)	72 years	60 of 100 (Major)
21 September 1970	Grong Grong (Berembed), AU	daily rain	40.6 mm (1.6 in)	26.6 mm (1.0 in)	45 years	60 of 100 (Major)
21 September 1970	Mayo A, CA	monthly snowfall	24.9 cm (9.8 in)	16.3 cm (6.4 in)	34 years	56 of 100 (Notable)
21 September 1970	Deakin, AU	monthly rain	66.0 mm (2.6 in)	27.9 mm (1.1 in)	0 years	55 of 100 (Notable)
21 September 1970	Mundrabilla Station, AU	daily rain	29.0 mm (1.1 in)	17.3 mm (0.7 in)	24 years	53 of 100 (Notable)
21 September 1970	Russell, CA	daily rain	26.7 mm (1.1 in)	18.3 mm (0.7 in)	56 years	52 of 100 (Notable)
21 September 1970	Grand Marais, US	daily rain	66.3 mm (2.6 in)	35.8 mm (1.4 in)	39 years	52 of 100 (Notable)
21 September 1970	Tambellup, AU	daily rain	59.7 mm (2.4 in)	47.0 mm (1.9 in)	15 years	50 of 100 (Notable)
21 September 1970	Cuballing, AU	daily rain	29.7 mm (1.2 in)	16.7 mm (0.7 in)	41 years	49 of 100 (Notable)
21 September 1970	Kulin, AU	daily rain	25.9 mm (1.0 in)	21.6 mm (0.9 in)	15 years	49 of 100 (Notable)
21 September 1970	Lightning Ridge (Guiseley), AU	monthly rain	76.2 mm (3.0 in)	29.0 mm (1.1 in)	5 years	49 of 100 (Notable)
21 September 1970	Guadalajara (Dge), MX	daily rain	65.3 mm (2.6 in)	47.5 mm (1.9 in)	20 years	48 of 100 (Notable)
21 September 1970	Turocak, RU	daily rain	37.0 mm (1.5 in)	24.2 mm (1.0 in)	16 years	48 of 100 (Notable)
21 September 1970	Darlington Point (Tubbo Well), AU	monthly rain	45.7 mm (1.8 in)	18.5 mm (0.7 in)	6 years	45 of 100 (Notable)
21 September 1970	Coober Pedy, AU	monthly rain	29.7 mm (1.2 in)	9.4 mm (0.37 in)	35 years	44 of 100 (Notable)
21 September 1970	Darlington Point (Tubbo), AU	monthly rain	45.7 mm (1.8 in)	0.5 mm (0.02 in)	85 years	44 of 100 (Notable)
21 September 1970	Isis Downs, AU	daily rain	30.2 mm (1.2 in)	19.3 mm (0.8 in)	55 years	42 of 100 (Notable)
21 September 1970	Mackinaw City 2, US	monthly rain	70.6 mm (2.8 in)	4.6 mm (0.18 in)	70 years	42 of 100 (Notable)
21 September 1970	Yellanup, AU	daily rain	33.8 mm (1.3 in)	19.3 mm (0.8 in)	20 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

1805 to 1970

Records set or tied on this calendar date in each year from 1805 to 1970. 1970 had 708 records.

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

Records on 09-21 in each year
Year	Records
1805	1
1812	1
1825	2
1840	1
1841	1
1842	1
1848	1
1854	1
1856	2
1868	1
1872	2
1873	1
1877	1
1878	1
1881	1
1882	1
1884	1
1886	1
1888	2
1889	1
1891	10
1892	1
1893	10
1894	2
1895	3
1896	2
1897	6
1898	6
1899	3
1900	2
1901	5
1902	5
1903	8
1904	20
1905	12
1906	17
1907	10
1908	17
1909	10
1910	8
1911	18
1912	26
1913	37
1914	29
1915	34
1916	48
1917	28
1918	43
1919	54
1920	29
1921	64
1922	35
1923	232
1924	291
1925	278
1926	178
1927	165
1928	81
1929	232
1930	82
1931	681
1932	242
1933	193
1934	492
1935	199
1936	329
1937	487
1938	508
1939	308
1940	908
1941	416
1942	291
1943	407
1944	413
1945	507
1946	176
1947	534
1948	301
1949	298
1950	334
1951	241
1952	430
1953	382
1954	453
1955	752
1956	1,100
1957	366
1958	588
1959	513
1960	418
1961	441
1962	1,085
1963	306
1964	374
1965	1,088
1966	565
1967	577
1968	790
1969	593
1970	708
1971	645
1972	599
1973	421
1974	652
1975	528
1976	694
1977	918
1978	818
1979	736
1980	990
1981	696
1982	1,484
1983	2,207
1984	707
1985	796
1986	671
1987	965
1988	557
1989	1,002
1990	716
1991	1,021
1992	752
1993	911
1994	713
1995	2,002
1996	1,233
1997	1,112
1998	1,481
1999	1,025
2000	884
2001	718
2002	696
2003	959
2004	888
2005	1,143
2006	920
2007	742
2008	740
2009	715
2010	1,290
2011	542
2012	595
2013	769
2014	716
2015	565
2016	989
2017	1,178
2018	1,051
2019	833
2020	580
2021	465
2022	1,049
2023	783
2024	470
2025	591
2026	478

Download the Data

Data for records on 1970-09-21: 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 2026-10-16 (16 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	549
25 to 50	13
50 to 75	1
75 to 100	0
100 to 125	0
125 to 150	0
150 to 175	1