Weather Records on 12 September 1917

231 weather records were set or tied worldwide on 12 September 1917. Highest significance: Dohne (Sar), ZA.

Key Facts for 12 September 1917

On 12 September 1917, 231 weather records were set or tied at long-record stations worldwide.
6 were record highs and 34 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 23 monthly and 208 daily.
Dohne (Sar) set a monthly record daily precipitation of 108.5 mm (4.3 in) on 12 September 1917.
Across 164 earlier years (1793 to 2026) the same calendar date averaged 414 records.

Record Map

231 stations

231 station records on 12 September 1917 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 12 September 1917: highest significance records shown on the map
Station	Country	Type	Value	Significance
Dohne (Sar)	South Africa	Record daily precipitation	108.5 mm (4.3 in)	57 of 100 (Notable)
Adelaide (Thorndon Park)	Australia	Record daily precipitation	32.0 mm (1.3 in)	55 of 100 (Notable)
Warooka	Australia	Record daily precipitation	28.4 mm (1.1 in)	53 of 100 (Notable)
Bridgewater	Australia	Record daily precipitation	50.8 mm (2.0 in)	51 of 100 (Notable)
Kadina	Australia	Record daily precipitation	35.6 mm (1.4 in)	49 of 100 (Notable)
Maitland	Australia	Record daily precipitation	49.3 mm (1.9 in)	49 of 100 (Notable)
Cape Jervis Lighthouse	Australia	Record daily precipitation	36.3 mm (1.4 in)	49 of 100 (Notable)
Cape Willoughby	Australia	Record daily precipitation	28.2 mm (1.1 in)	48 of 100 (Notable)
Willunga	Australia	Record daily precipitation	40.6 mm (1.6 in)	48 of 100 (Notable)
Moonta	Australia	Record daily precipitation	30.2 mm (1.2 in)	47 of 100 (Notable)
Mitcham Post Office	Australia	Record daily precipitation	44.5 mm (1.8 in)	47 of 100 (Notable)
Old Noarlunga Post Office	Australia	Record daily precipitation	43.2 mm (1.7 in)	47 of 100 (Notable)
Second Valley (Poolamacca)	Australia	Record daily precipitation	36.6 mm (1.4 in)	47 of 100 (Notable)
Blyth	Australia	Record daily precipitation	35.6 mm (1.4 in)	46 of 100 (Notable)
Ardrossan	Australia	Record daily precipitation	29.2 mm (1.1 in)	46 of 100 (Notable)
Minlaton	Australia	Record daily precipitation	33.8 mm (1.3 in)	46 of 100 (Notable)
Stansbury	Australia	Record daily precipitation	29.2 mm (1.1 in)	46 of 100 (Notable)
Adelaide (Morphett Vale)	Australia	Record daily precipitation	44.5 mm (1.8 in)	46 of 100 (Notable)
Millicent	Australia	Record daily precipitation	26.7 mm (1.1 in)	46 of 100 (Notable)
Dingo Vale	Australia	Record daily precipitation	36.6 mm (1.4 in)	45 of 100 (Notable)
Lobethal	Australia	Record daily precipitation	38.4 mm (1.5 in)	45 of 100 (Notable)
Mount Barker	Australia	Record daily precipitation	35.3 mm (1.4 in)	45 of 100 (Notable)
Nairne	Australia	Record daily precipitation	34.3 mm (1.4 in)	45 of 100 (Notable)
Port Broughton	Australia	Record daily precipitation	33.8 mm (1.3 in)	44 of 100 (Notable)
Woodside	Australia	Record daily precipitation	38.1 mm (1.5 in)	44 of 100 (Notable)
Mundoora	Australia	Record daily precipitation	43.2 mm (1.7 in)	42 of 100 (Notable)
Meadows	Australia	Record daily precipitation	69.9 mm (2.8 in)	42 of 100 (Notable)
Adelaide (Tea Tree Gully Counc	Australia	Record daily precipitation	31.8 mm (1.3 in)	42 of 100 (Notable)
Kingston SE	Australia	Record daily precipitation	27.2 mm (1.1 in)	42 of 100 (Notable)
Wallaroo	Australia	Record daily precipitation	29.2 mm (1.1 in)	41 of 100 (Notable)
Hamley Bridge	Australia	Record daily precipitation	25.9 mm (1.0 in)	41 of 100 (Notable)
Brinkworth (Anama Park)	Australia	Record daily precipitation	33.0 mm (1.3 in)	40 of 100 (Notable)
Wandearah North	Australia	Record daily precipitation	33.3 mm (1.3 in)	40 of 100 (Notable)
Yankalilla (Woodvale)	Australia	Record daily precipitation	27.4 mm (1.1 in)	40 of 100 (Notable)
Ida	South Africa	Record daily precipitation	43.2 mm (1.7 in)	40 of 100 (Notable)
Kologha (Bos)	South Africa	Record daily precipitation	45.7 mm (1.8 in)	38 of 100 (Notable)
Balaklava	Australia	Record daily precipitation	27.2 mm (1.1 in)	37 of 100 (Notable)
Maitland (Weetulta)	Australia	Record daily precipitation	49.3 mm (1.9 in)	37 of 100 (Notable)
Riverton	Australia	Record daily precipitation	25.1 mm (1.0 in)	37 of 100 (Notable)
Isidinge (Bos)	South Africa	Record daily precipitation	55.4 mm (2.2 in)	37 of 100 (Notable)
Ashbourne	Australia	Record daily precipitation	39.1 mm (1.5 in)	36 of 100 (Notable)
Robe Comparison	Australia	Record daily precipitation	33.8 mm (1.3 in)	36 of 100 (Notable)
Yardley Chase	South Africa	Record daily precipitation	35.6 mm (1.4 in)	35 of 100 (Notable)
Warnertown (Willow Lodge)	Australia	Record daily precipitation	33.0 mm (1.3 in)	34 of 100 (Routine)
Maitland (Woodburlie)	Australia	Record daily precipitation	41.4 mm (1.6 in)	34 of 100 (Routine)
Gumeracha	Australia	Record daily precipitation	30.5 mm (1.2 in)	33 of 100 (Routine)
Hogsback (Bos)	South Africa	Record daily precipitation	49.5 mm (1.9 in)	33 of 100 (Routine)
Birdwood	Australia	Record daily precipitation	26.7 mm (1.1 in)	32 of 100 (Routine)
Macclesfield	Australia	Record daily precipitation	30.5 mm (1.2 in)	32 of 100 (Routine)
Kei Road (Pol)	South Africa	Record daily precipitation	99.1 mm (3.9 in)	32 of 100 (Routine)
Lady Frere (Tnk)	South Africa	Record daily precipitation	39.1 mm (1.5 in)	32 of 100 (Routine)
Auburn	Australia	Record daily precipitation	28.2 mm (1.1 in)	31 of 100 (Routine)
Bute (Ninnes)	Australia	Record daily precipitation	35.6 mm (1.4 in)	31 of 100 (Routine)
Belair (State Flora Nursery)	Australia	Record daily precipitation	52.1 mm (2.1 in)	31 of 100 (Routine)
Clare Post Office	Australia	Record daily precipitation	30.0 mm (1.2 in)	30 of 100 (Routine)
Mount Torrens	Australia	Record daily precipitation	30.5 mm (1.2 in)	30 of 100 (Routine)
Freiburg	Germany	Record daily precipitation	35.8 mm (1.4 in)	30 of 100 (Routine)
Cowell	Australia	Record daily precipitation	25.4 mm (1.0 in)	27 of 100 (Routine)
Miltalie (Poodra)	Australia	Record daily precipitation	25.4 mm (1.0 in)	27 of 100 (Routine)
Paskeville	Australia	Record daily precipitation	36.6 mm (1.4 in)	27 of 100 (Routine)

Counts by Type and Timescale

231 records

Records set or tied on 12 September 1917 by type: Lowest daily maximum 4, Highest daily minimum 6, Lowest daily minimum 30, Heaviest daily rainfall 191.

Records on 12 September 1917 by type
Record type	Records
Highest daily maximum	0
Lowest daily maximum	4
Highest daily minimum	6
Lowest daily minimum	30
Heaviest daily rainfall	191
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 12 September 1917 by timescale: all-time 0, monthly 23, daily 208.

How Much Records Were Beaten By

221 broken records

Margins by which the 221 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 43.0. Ties are not counted.

Top 20 by Significance

12 September 1917

Top 20 records on 12 September 1917 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
12 September 1917	Dohne (Sar), ZA	monthly rain	108.5 mm (4.3 in)	42.5 mm (1.7 in)	15 years	57 of 100 (Notable)
12 September 1917	Adelaide (Thorndon Park), AU	daily rain	32.0 mm (1.3 in)	20.8 mm (0.8 in)	37 years	55 of 100 (Notable)
12 September 1917	Warooka, AU	daily rain	28.4 mm (1.1 in)	19.5 mm (0.8 in)	27 years	53 of 100 (Notable)
12 September 1917	Bridgewater, AU	daily rain	50.8 mm (2.0 in)	37.3 mm (1.5 in)	27 years	51 of 100 (Notable)
12 September 1917	Kadina, AU	daily rain	35.6 mm (1.4 in)	24.7 mm (1.0 in)	16 years	49 of 100 (Notable)
12 September 1917	Maitland, AU	monthly rain	49.3 mm (1.9 in)	17.5 mm (0.7 in)	7 years	49 of 100 (Notable)
12 September 1917	Cape Jervis Lighthouse, AU	daily rain	36.3 mm (1.4 in)	29.9 mm (1.2 in)	16 years	49 of 100 (Notable)
12 September 1917	Cape Willoughby, AU	daily rain	28.2 mm (1.1 in)	15.0 mm (0.6 in)	25 years	48 of 100 (Notable)
12 September 1917	Willunga, AU	daily rain	40.6 mm (1.6 in)	27.1 mm (1.1 in)	11 years	48 of 100 (Notable)
12 September 1917	Moonta, AU	daily rain	30.2 mm (1.2 in)	23.1 mm (0.9 in)	11 years	47 of 100 (Notable)
12 September 1917	Mitcham Post Office, AU	daily rain	44.5 mm (1.8 in)	36.1 mm (1.4 in)	15 years	47 of 100 (Notable)
12 September 1917	Old Noarlunga Post Office, AU	daily rain	43.2 mm (1.7 in)	28.2 mm (1.1 in)	11 years	47 of 100 (Notable)
12 September 1917	Second Valley (Poolamacca), AU	daily rain	36.6 mm (1.4 in)	24.9 mm (1.0 in)	16 years	47 of 100 (Notable)
12 September 1917	Blyth, AU	daily rain	35.6 mm (1.4 in)	25.9 mm (1.0 in)	11 years	46 of 100 (Notable)
12 September 1917	Ardrossan, AU	daily rain	29.2 mm (1.1 in)	22.8 mm (0.9 in)	11 years	46 of 100 (Notable)
12 September 1917	Minlaton, AU	daily rain	33.8 mm (1.3 in)	27.4 mm (1.1 in)	11 years	46 of 100 (Notable)
12 September 1917	Stansbury, AU	daily rain	29.2 mm (1.1 in)	23.4 mm (0.9 in)	11 years	46 of 100 (Notable)
12 September 1917	Adelaide (Morphett Vale), AU	daily rain	44.5 mm (1.8 in)	33.6 mm (1.3 in)	11 years	46 of 100 (Notable)
12 September 1917	Millicent, AU	daily rain	26.7 mm (1.1 in)	17.3 mm (0.7 in)	23 years	46 of 100 (Notable)
12 September 1917	Dingo Vale, AU	daily rain	36.6 mm (1.4 in)	27.7 mm (1.1 in)	29 years	45 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 1917

Records set or tied on this calendar date in each year from 1793 to 1917. 1917 had 231 records.

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

Records on 09-12 in each year
Year	Records
1793	2
1809	1
1813	1
1814	2
1834	1
1837	2
1839	1
1847	1
1848	1
1854	4
1859	2
1860	2
1865	2
1866	1
1867	1
1868	2
1869	1
1872	2
1876	1
1878	1
1880	1
1881	1
1882	1
1884	2
1885	2
1886	1
1887	2
1888	2
1889	1
1891	4
1892	1
1893	4
1894	1
1895	5
1896	2
1897	3
1898	3
1899	4
1900	1
1901	5
1902	11
1903	18
1904	7
1905	8
1906	24
1907	11
1908	12
1909	11
1910	4
1911	15
1912	20
1913	12
1914	49
1915	71
1916	21
1917	231
1918	42
1919	69
1920	49
1921	60
1922	136
1923	33
1924	177
1925	443
1926	89
1927	339
1928	155
1929	118
1930	198
1931	648
1932	199
1933	360
1934	176
1935	441
1936	515
1937	318
1938	332
1939	702
1940	891
1941	172
1942	337
1943	544
1944	393
1945	414
1946	302
1947	596
1948	292
1949	512
1950	578
1951	399
1952	575
1953	515
1954	313
1955	457
1956	389
1957	727
1958	783
1959	536
1960	772
1961	750
1962	407
1963	466
1964	836
1965	459
1966	416
1967	510
1968	428
1969	558
1970	619
1971	593
1972	430
1973	588
1974	575
1975	1,102
1976	539
1977	524
1978	952
1979	765
1980	511
1981	424
1982	993
1983	915
1984	700
1985	876
1986	787
1987	686
1988	997
1989	1,313
1990	1,001
1991	672
1992	767
1993	798
1994	550
1995	532
1996	1,014
1997	737
1998	1,770
1999	938
2000	1,188
2001	797
2002	883
2003	830
2004	653
2005	1,032
2006	963
2007	776
2008	1,213
2009	876
2010	939
2011	988
2012	639
2013	1,066
2014	1,374
2015	704
2016	748
2017	1,114
2018	595
2019	884
2020	566
2021	513
2022	739
2023	844
2024	1,009
2025	433
2026	627

Download the Data

Data for records on 1917-09-12: 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).

Histogram of margins by which records were beaten on 12 September 1917
Margin	Records
0 to 10	138
10 to 20	50
20 to 30	25
30 to 40	6
40 to 50	2