Weather Records on 17 September 1921

66 weather records were set or tied worldwide on 17 September 1921. Highest significance: Cape Borda Comparison, AU.

Key Facts for 17 September 1921

On 17 September 1921, 66 weather records were set or tied at long-record stations worldwide.
21 were record highs and 10 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 2 monthly and 64 daily.
Cape Borda Comparison set a monthly record daily precipitation of 49.3 mm (1.9 in) on 17 September 1921.
Across 164 earlier years (1796 to 2026) the same calendar date averaged 425 records.

Record Map

66 stations

66 station records on 17 September 1921 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 September 1921: highest significance records shown on the map
Station	Country	Type	Value	Significance
Cape Borda Comparison	Australia	Record daily precipitation	49.3 mm (1.9 in)	63 of 100 (Major)
Victor Harbor Comparison	Australia	Record daily precipitation	38.1 mm (1.5 in)	50 of 100 (Notable)
St Albans	Canada	Record daily precipitation	34.3 mm (1.4 in)	43 of 100 (Notable)
Second Valley (Spring Grove)	Australia	Record daily precipitation	38.9 mm (1.5 in)	36 of 100 (Notable)
Port Stanley	Canada	Record daily precipitation	53.1 mm (2.1 in)	36 of 100 (Notable)
Armagh	United Kingdom	Record low maximum temperature	12.3 C (54.1 F)	32 of 100 (Routine)
Mundoora	Australia	Record daily precipitation	26.9 mm (1.1 in)	30 of 100 (Routine)
Yallook	Australia	Record daily precipitation	33.5 mm (1.3 in)	25 of 100 (Routine)
Stratford	Canada	Record high minimum temperature	20.0 C (68.0 F)	25 of 100 (Routine)
Sacramento 5 ESE	United States	Record low maximum temperature	17.2 C (63.0 F)	21 of 100 (Routine)
Shenkursk	Russia	Record daily precipitation	12.8 mm (0.5 in)	20 of 100 (Routine)
Wartook Post Office	Australia	Record daily precipitation	20.8 mm (0.8 in)	20 of 100 (Routine)
Perth Regional Office	Australia	Record daily precipitation	23.6 mm (0.9 in)	20 of 100 (Routine)
Beechal	Australia	Record daily precipitation	7.1 mm (0.28 in)	20 of 100 (Routine)
Warranooke (Glenorchy)	Australia	Record daily precipitation	21.1 mm (0.8 in)	20 of 100 (Routine)
Barkers Creek Reservoir	Australia	Record daily precipitation	27.9 mm (1.1 in)	20 of 100 (Routine)
Branxholme (Bassett)	Australia	Record daily precipitation	20.3 mm (0.8 in)	20 of 100 (Routine)
Montgomery Wb City	United States	Record daily precipitation	34.3 mm (1.4 in)	20 of 100 (Routine)
Paris	Canada	Record daily precipitation	15.2 mm (0.6 in)	19 of 100 (Routine)
Roseworthy Agric College	Australia	Record daily precipitation	15.7 mm (0.6 in)	18 of 100 (Routine)
Dublin Phoenix Park	Ireland	Record low maximum temperature	13.3 C (55.9 F)	17 of 100 (Routine)
Tbilisi	Georgia	Record low minimum temperature	6.3 C (43.3 F)	15 of 100 (Routine)
Port Campbell Post Office	Australia	Record daily precipitation	17.0 mm (0.7 in)	14 of 100 (Routine)
Port Dover	Canada	Record daily precipitation	21.3 mm (0.8 in)	14 of 100 (Routine)
Boulia Airport	Australia	Record high minimum temperature	23.4 C (74.1 F)	13 of 100 (Routine)
Guelph Oac	Canada	Record daily precipitation	20.3 mm (0.8 in)	13 of 100 (Routine)
Toronto Deer Park	Canada	Record daily precipitation	12.2 mm (0.5 in)	13 of 100 (Routine)
Brinkley	United States	Record high minimum temperature	24.4 C (75.9 F)	13 of 100 (Routine)
Medford	United States	Record daily precipitation	21.6 mm (0.9 in)	13 of 100 (Routine)
Little Rock St Capitol	United States	Record high minimum temperature	23.9 C (75.0 F)	12 of 100 (Routine)
Kazalinsk	Kazakhstan	Record daily precipitation	5.9 mm (0.23 in)	11 of 100 (Routine)
Cherdyn'	Russia	Record daily precipitation	17.4 mm (0.7 in)	11 of 100 (Routine)
Stuttgart	United States	Record high minimum temperature	23.3 C (73.9 F)	11 of 100 (Routine)
Lexington	United States	Record high maximum temperature	33.9 C (93.0 F)	11 of 100 (Routine)
Chatham 2	Canada	Record daily precipitation	26.4 mm (1.0 in)	10 of 100 (Routine)
Vastervik	Sweden	Record low maximum temperature	12.0 C (53.6 F)	10 of 100 (Routine)
Alma	United States	Record daily precipitation	16.3 mm (0.6 in)	10 of 100 (Routine)
State College	United States	Record daily precipitation	30.0 mm (1.2 in)	10 of 100 (Routine)
Rupanyup (Lallat Plains)	Australia	Record daily precipitation	17.0 mm (0.7 in)	9 of 100 (Routine)
Grenfell	Canada	Record daily precipitation	12.4 mm (0.5 in)	9 of 100 (Routine)
Weldon	United States	Record high maximum temperature	35.0 C (95.0 F)	9 of 100 (Routine)
Houston Wb City	United States	Record high minimum temperature	25.0 C (77.0 F)	9 of 100 (Routine)
Goornong	Australia	Record daily precipitation	19.1 mm (0.8 in)	8 of 100 (Routine)
Koroit	Australia	Record daily precipitation	7.6 mm (0.30 in)	8 of 100 (Routine)
Fort Chipewyan	Canada	Record low minimum temperature	-4.4 C (24.1 F)	8 of 100 (Routine)
Troicko-Pecherskoe	Russia	Record daily precipitation	8.9 mm (0.35 in)	8 of 100 (Routine)
Lexington Bluegrass AP	United States	Record high minimum temperature	21.7 C (71.1 F)	8 of 100 (Routine)
Stockholm	Sweden	Record low maximum temperature	10.0 C (50.0 F)	7 of 100 (Routine)
Malvern	United States	Record high minimum temperature	23.3 C (73.9 F)	7 of 100 (Routine)
Alma	United States	Record high minimum temperature	16.1 C (61.0 F)	7 of 100 (Routine)
Batesville	United States	Record high minimum temperature	22.2 C (72.0 F)	7 of 100 (Routine)
Louisville	United States	Record high minimum temperature	22.8 C (73.0 F)	7 of 100 (Routine)
Crowlands (Woodlands)	Australia	Record daily precipitation	13.5 mm (0.5 in)	6 of 100 (Routine)
Murrumbeena Leeds Grove	Australia	Record daily precipitation	13.7 mm (0.5 in)	6 of 100 (Routine)
Stonecliffe	Canada	Record low minimum temperature	-6.7 C (19.9 F)	5 of 100 (Routine)
Sonnblick	Austria	Record high minimum temperature	3.2 C (37.8 F)	4 of 100 (Routine)
Clarion 3 SW	United States	Record daily precipitation	17.8 mm (0.7 in)	3 of 100 (Routine)
Lexington Bluegrass AP	United States	Record high maximum temperature	32.2 C (90.0 F)	3 of 100 (Routine)
Nemours (Ghazaouet)	Algeria	Record high minimum temperature	22.0 C (71.6 F)	2 of 100 (Routine)
Kirov	Russia	Record low minimum temperature	0.5 C (32.9 F)	2 of 100 (Routine)

Counts by Type and Timescale

66 records

Records set or tied on 17 September 1921 by type: Highest daily maximum 4, Lowest daily maximum 6, Highest daily minimum 17, Lowest daily minimum 4, Heaviest daily rainfall 35.

Records on 17 September 1921 by type
Record type	Records
Highest daily maximum	4
Lowest daily maximum	6
Highest daily minimum	17
Lowest daily minimum	4
Heaviest daily rainfall	35
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 17 September 1921 by timescale: all-time 0, monthly 2, daily 64.

How Much Records Were Beaten By

56 broken records

Margins by which the 56 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 31.5. Ties are not counted.

Top 20 by Significance

17 September 1921

Top 20 records on 17 September 1921 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 September 1921	Cape Borda Comparison, AU	monthly rain	49.3 mm (1.9 in)	14.8 mm (0.6 in)	36 years	63 of 100 (Major)
17 September 1921	Victor Harbor Comparison, AU	daily rain	38.1 mm (1.5 in)	22.4 mm (0.9 in)	25 years	50 of 100 (Notable)
17 September 1921	St Albans, CA	daily rain	34.3 mm (1.4 in)	31.5 mm (1.2 in)	11 years	43 of 100 (Notable)
17 September 1921	Second Valley (Spring Grove), AU	daily rain	38.9 mm (1.5 in)	16.5 mm (0.6 in)	24 years	36 of 100 (Notable)
17 September 1921	Port Stanley, CA	daily rain	53.1 mm (2.1 in)	21.9 mm (0.9 in)	18 years	36 of 100 (Notable)
17 September 1921	Armagh, GB	daily low max	12.3 C (54.1 F)	0.9 C (1.6 F)	73 years	32 of 100 (Routine)
17 September 1921	Mundoora, AU	daily rain	26.9 mm (1.1 in)	13.9 mm (0.5 in)	18 years	30 of 100 (Routine)
17 September 1921	Yallook, AU	daily rain	33.5 mm (1.3 in)	11.9 mm (0.5 in)	24 years	25 of 100 (Routine)
17 September 1921	Stratford, CA	daily high min	20.0 C (68.0 F)	2.2 C (4.0 F)	53 years	25 of 100 (Routine)
17 September 1921	Sacramento 5 ESE, US	daily low max	17.2 C (63.0 F)	2.8 C (5.0 F)	38 years	21 of 100 (Routine)
17 September 1921	Shenkursk, RU	daily rain	12.8 mm (0.5 in)	6.7 mm (0.26 in)	32 years	20 of 100 (Routine)
17 September 1921	Wartook Post Office, AU	daily rain	20.8 mm (0.8 in)	11.4 mm (0.4 in)	11 years	20 of 100 (Routine)
17 September 1921	Perth Regional Office, AU	daily rain	23.6 mm (0.9 in)	8.9 mm (0.35 in)	20 years	20 of 100 (Routine)
17 September 1921	Beechal, AU	daily rain	7.1 mm (0.28 in)	7.1 mm (0.28 in)	37 years	20 of 100 (Routine)
17 September 1921	Warranooke (Glenorchy), AU	daily rain	21.1 mm (0.8 in)	6.6 mm (0.26 in)	25 years	20 of 100 (Routine)
17 September 1921	Barkers Creek Reservoir, AU	daily rain	27.9 mm (1.1 in)	7.6 mm (0.30 in)	24 years	20 of 100 (Routine)
17 September 1921	Branxholme (Bassett), AU	daily rain	20.3 mm (0.8 in)	6.1 mm (0.24 in)	22 years	20 of 100 (Routine)
17 September 1921	Montgomery Wb City, US	daily rain	34.3 mm (1.4 in)	9.2 mm (0.36 in)	33 years	20 of 100 (Routine)
17 September 1921	Paris, CA	daily rain	15.2 mm (0.6 in)	5.5 mm (0.22 in)	32 years	19 of 100 (Routine)
17 September 1921	Roseworthy Agric College, AU	daily rain	15.7 mm (0.6 in)	6.8 mm (0.27 in)	4 years	18 of 100 (Routine)

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

1796 to 1921

Records set or tied on this calendar date in each year from 1796 to 1921. 1921 had 66 records.

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

Records on 09-17 in each year
Year	Records
1796	1
1797	1
1805	1
1833	1
1834	1
1837	2
1845	1
1847	3
1848	1
1850	1
1851	2
1853	2
1854	2
1859	1
1862	1
1867	1
1870	1
1871	1
1872	1
1873	1
1874	1
1875	1
1877	1
1881	1
1882	2
1884	3
1885	3
1886	6
1888	2
1889	8
1891	1
1893	3
1894	1
1895	4
1896	9
1897	4
1898	7
1899	1
1900	4
1901	5
1902	5
1903	28
1904	2
1905	17
1906	10
1907	15
1908	13
1909	7
1910	38
1911	15
1912	17
1913	28
1914	38
1915	48
1916	40
1917	255
1918	41
1919	21
1920	40
1921	66
1922	47
1923	159
1924	80
1925	338
1926	154
1927	420
1928	78
1929	168
1930	147
1931	564
1932	425
1933	415
1934	246
1935	321
1936	219
1937	463
1938	363
1939	294
1940	326
1941	328
1942	581
1943	513
1944	403
1945	614
1946	620
1947	680
1948	630
1949	292
1950	412
1951	359
1952	263
1953	344
1954	449
1955	649
1956	437
1957	405
1958	806
1959	1,210
1960	385
1961	657
1962	432
1963	297
1964	559
1965	1,394
1966	523
1967	331
1968	691
1969	352
1970	412
1971	898
1972	556
1973	638
1974	491
1975	478
1976	636
1977	641
1978	764
1979	804
1980	794
1981	1,155
1982	606
1983	862
1984	1,006
1985	448
1986	1,314
1987	926
1988	982
1989	863
1990	650
1991	1,407
1992	686
1993	950
1994	986
1995	1,145
1996	1,342
1997	1,057
1998	1,137
1999	1,102
2000	1,318
2001	895
2002	1,025
2003	586
2004	872
2005	1,042
2006	1,344
2007	752
2008	886
2009	871
2010	907
2011	1,116
2012	597
2013	1,253
2014	571
2015	953
2016	707
2017	455
2018	899
2019	774
2020	651
2021	345
2022	313
2023	646
2024	954
2025	634
2026	968

Download the Data

Data for records on 1921-09-17: 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 2026-10-15. Last revised 15 October 2026 (2026-10-15).

Margin	Records
0 to 5	35
5 to 10	13
10 to 15	4
15 to 20	1
20 to 25	2
25 to 30	0
30 to 35	1