Weather Records on 17 September 1917

255 weather records were set or tied worldwide on 17 September 1917. Highest significance: Holbrook (Rsl), AU.

Key Facts for 17 September 1917

On 17 September 1917, 255 weather records were set or tied at long-record stations worldwide.
7 were record highs and 12 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 18 monthly and 237 daily.
Holbrook (Rsl) set a monthly record daily precipitation of 79.0 mm (3.1 in) on 17 September 1917.
Across 164 earlier years (1796 to 2026) the same calendar date averaged 424 records.

Record Map

255 stations

255 station records on 17 September 1917 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 September 1917: highest significance records shown on the map
Station	Country	Type	Value	Significance
Holbrook (Rsl)	Australia	Record daily precipitation	79.0 mm (3.1 in)	57 of 100 (Notable)
Nymagee (Pyramid)	Australia	Record daily precipitation	43.7 mm (1.7 in)	47 of 100 (Notable)
Carrathool (Uardry)	Australia	Record daily precipitation	49.5 mm (1.9 in)	47 of 100 (Notable)
Forbes (Camp Street)	Australia	Record daily precipitation	50.5 mm (2.0 in)	46 of 100 (Notable)
Melrose Plains	Australia	Record daily precipitation	47.0 mm (1.9 in)	44 of 100 (Notable)
Berthong	Australia	Record daily precipitation	40.1 mm (1.6 in)	42 of 100 (Notable)
Morangarell	Australia	Record daily precipitation	43.7 mm (1.7 in)	41 of 100 (Notable)
Tarcutta	Australia	Record daily precipitation	39.1 mm (1.5 in)	40 of 100 (Notable)
Avoca (Post Office)	Australia	Record daily precipitation	40.6 mm (1.6 in)	40 of 100 (Notable)
Coronga Downs	Australia	Record daily precipitation	43.2 mm (1.7 in)	38 of 100 (Notable)
Tottenham (Woodlands 1)	Australia	Record daily precipitation	35.6 mm (1.4 in)	38 of 100 (Notable)
Girilambone (Booroomugga)	Australia	Record daily precipitation	31.5 mm (1.2 in)	37 of 100 (Notable)
Condobolin (Borambil Park)	Australia	Record daily precipitation	31.8 mm (1.3 in)	36 of 100 (Notable)
Tarcutta Post Office	Australia	Record daily precipitation	39.4 mm (1.6 in)	36 of 100 (Notable)
Nariel Creek (Simpson)	Australia	Record daily precipitation	62.0 mm (2.4 in)	36 of 100 (Notable)
Walwa	Australia	Record daily precipitation	42.7 mm (1.7 in)	36 of 100 (Notable)
Langmorn	Australia	Record daily precipitation	42.4 mm (1.7 in)	35 of 100 (Notable)
Trundle (Murrumbogie)	Australia	Record daily precipitation	30.2 mm (1.2 in)	35 of 100 (Notable)
Batlow Post Office	Australia	Record daily precipitation	57.7 mm (2.3 in)	35 of 100 (Notable)
Talmalmo	Australia	Record daily precipitation	42.2 mm (1.7 in)	35 of 100 (Notable)
Brundah	Australia	Record daily precipitation	36.1 mm (1.4 in)	35 of 100 (Notable)
Gredgwin (Barraport North)	Australia	Record daily precipitation	25.4 mm (1.0 in)	35 of 100 (Notable)
Florida Station	Australia	Record daily precipitation	34.5 mm (1.4 in)	33 of 100 (Routine)
Mandamar	Australia	Record daily precipitation	38.1 mm (1.5 in)	33 of 100 (Routine)
Nymagee (Kenmure Station)	Australia	Record daily precipitation	51.3 mm (2.0 in)	32 of 100 (Routine)
Denman (Martindale)	Australia	Record daily precipitation	55.6 mm (2.2 in)	32 of 100 (Routine)
Sussex	Australia	Record daily precipitation	35.6 mm (1.4 in)	31 of 100 (Routine)
Sandy Creek Tank	Australia	Record daily precipitation	38.6 mm (1.5 in)	31 of 100 (Routine)
Peak Hill (Genanaguy)	Australia	Record daily precipitation	40.1 mm (1.6 in)	31 of 100 (Routine)
Yellowin	Australia	Record daily precipitation	46.0 mm (1.8 in)	31 of 100 (Routine)
The Rock (Bullenbong)	Australia	Record daily precipitation	30.7 mm (1.2 in)	31 of 100 (Routine)
Ooma	Australia	Record daily precipitation	35.1 mm (1.4 in)	30 of 100 (Routine)
Warrangong	Australia	Record daily precipitation	37.1 mm (1.5 in)	30 of 100 (Routine)
Goonumbla (Coradgery)	Australia	Record daily precipitation	32.5 mm (1.3 in)	28 of 100 (Routine)
Athol 1	Australia	Record daily precipitation	32.5 mm (1.3 in)	28 of 100 (Routine)
Murrumburrah Old Post Office	Australia	Record daily precipitation	54.4 mm (2.1 in)	28 of 100 (Routine)
Narra Allen	Australia	Record daily precipitation	36.8 mm (1.4 in)	28 of 100 (Routine)
Groongal (Gundaline)	Australia	Record daily precipitation	36.8 mm (1.4 in)	28 of 100 (Routine)
Cobar (Meryula)	Australia	Record daily precipitation	31.8 mm (1.3 in)	27 of 100 (Routine)
Canowindra (Canowindra Street)	Australia	Record daily precipitation	40.1 mm (1.6 in)	27 of 100 (Routine)
Adelong Post Office	Australia	Record daily precipitation	32.5 mm (1.3 in)	27 of 100 (Routine)
Yanco (Billinbah East)	Australia	Record daily precipitation	27.4 mm (1.1 in)	27 of 100 (Routine)
Cowra Post Office	Australia	Record daily precipitation	35.6 mm (1.4 in)	26 of 100 (Routine)
Goulburn (Kippilaw)	Australia	Record daily precipitation	30.7 mm (1.2 in)	26 of 100 (Routine)
Urana Post Office	Australia	Record daily precipitation	32.0 mm (1.3 in)	26 of 100 (Routine)
Bulgandramine	Australia	Record daily precipitation	34.5 mm (1.4 in)	25 of 100 (Routine)
Yackandandah	Australia	Record daily precipitation	45.7 mm (1.8 in)	25 of 100 (Routine)
Eremeran	Australia	Record daily precipitation	39.6 mm (1.6 in)	24 of 100 (Routine)
Dandaloo (Tyrie Homestead)	Australia	Record daily precipitation	48.3 mm (1.9 in)	24 of 100 (Routine)
Eugowra Post Office	Australia	Record daily precipitation	39.4 mm (1.6 in)	24 of 100 (Routine)
Grenfell (Quondong Rd)	Australia	Record daily precipitation	38.9 mm (1.5 in)	24 of 100 (Routine)
Harden (East St)	Australia	Record daily precipitation	49.3 mm (1.9 in)	23 of 100 (Routine)
Bulgandra	Australia	Record daily precipitation	39.4 mm (1.6 in)	23 of 100 (Routine)
Benerembah	Australia	Record daily precipitation	31.8 mm (1.3 in)	23 of 100 (Routine)
Cudgewa North	Australia	Record daily precipitation	42.4 mm (1.7 in)	23 of 100 (Routine)
Molong (King St)	Australia	Record daily precipitation	35.6 mm (1.4 in)	22 of 100 (Routine)
Jindera (Wadilock)	Australia	Record daily precipitation	43.4 mm (1.7 in)	22 of 100 (Routine)
Daylesford	Australia	Record daily precipitation	31.8 mm (1.3 in)	22 of 100 (Routine)
Talbot	Australia	Record daily precipitation	26.2 mm (1.0 in)	22 of 100 (Routine)
Rapid City Forrest	Canada	Record daily precipitation	26.4 mm (1.0 in)	22 of 100 (Routine)

Counts by Type and Timescale

255 records

Records set or tied on 17 September 1917 by type: Highest daily maximum 4, Lowest daily maximum 10, Highest daily minimum 3, Lowest daily minimum 2, Heaviest daily rainfall 236.

Records on 17 September 1917 by type
Record type	Records
Highest daily maximum	4
Lowest daily maximum	10
Highest daily minimum	3
Lowest daily minimum	2
Heaviest daily rainfall	236
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 17 September 1917 by timescale: all-time 0, monthly 18, daily 237.

How Much Records Were Beaten By

240 broken records

Margins by which the 240 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 47.0. Ties are not counted.

Top 20 by Significance

17 September 1917

Top 20 records on 17 September 1917 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 September 1917	Holbrook (Rsl), AU	monthly rain	79.0 mm (3.1 in)	47.0 mm (1.9 in)	13 years	57 of 100 (Notable)
17 September 1917	Nymagee (Pyramid), AU	daily rain	43.7 mm (1.7 in)	30.0 mm (1.2 in)	14 years	47 of 100 (Notable)
17 September 1917	Carrathool (Uardry), AU	daily rain	49.5 mm (1.9 in)	41.4 mm (1.6 in)	14 years	47 of 100 (Notable)
17 September 1917	Forbes (Camp Street), AU	daily rain	50.5 mm (2.0 in)	26.1 mm (1.0 in)	37 years	46 of 100 (Notable)
17 September 1917	Melrose Plains, AU	daily rain	47.0 mm (1.9 in)	37.6 mm (1.5 in)	7 years	44 of 100 (Notable)
17 September 1917	Berthong, AU	daily rain	40.1 mm (1.6 in)	26.9 mm (1.1 in)	20 years	42 of 100 (Notable)
17 September 1917	Morangarell, AU	daily rain	43.7 mm (1.7 in)	27.2 mm (1.1 in)	7 years	41 of 100 (Notable)
17 September 1917	Tarcutta, AU	daily rain	39.1 mm (1.5 in)	18.3 mm (0.7 in)	20 years	40 of 100 (Notable)
17 September 1917	Avoca (Post Office), AU	daily rain	40.6 mm (1.6 in)	24.9 mm (1.0 in)	20 years	40 of 100 (Notable)
17 September 1917	Coronga Downs, AU	daily rain	43.2 mm (1.7 in)	30.8 mm (1.2 in)	14 years	38 of 100 (Notable)
17 September 1917	Tottenham (Woodlands 1), AU	daily rain	35.6 mm (1.4 in)	23.4 mm (0.9 in)	21 years	38 of 100 (Notable)
17 September 1917	Girilambone (Booroomugga), AU	daily rain	31.5 mm (1.2 in)	22.6 mm (0.9 in)	20 years	37 of 100 (Notable)
17 September 1917	Condobolin (Borambil Park), AU	daily rain	31.8 mm (1.3 in)	26.5 mm (1.0 in)	7 years	36 of 100 (Notable)
17 September 1917	Tarcutta Post Office, AU	daily rain	39.4 mm (1.6 in)	17.8 mm (0.7 in)	20 years	36 of 100 (Notable)
17 September 1917	Nariel Creek (Simpson), AU	monthly rain	62.0 mm (2.4 in)	14.8 mm (0.6 in)	32 years	36 of 100 (Notable)
17 September 1917	Walwa, AU	daily rain	42.7 mm (1.7 in)	20.6 mm (0.8 in)	14 years	36 of 100 (Notable)
17 September 1917	Langmorn, AU	daily rain	42.4 mm (1.7 in)	34.0 mm (1.3 in)	21 years	35 of 100 (Notable)
17 September 1917	Trundle (Murrumbogie), AU	daily rain	30.2 mm (1.2 in)	19.3 mm (0.8 in)	14 years	35 of 100 (Notable)
17 September 1917	Batlow Post Office, AU	daily rain	57.7 mm (2.3 in)	34.8 mm (1.4 in)	7 years	35 of 100 (Notable)
17 September 1917	Talmalmo, AU	monthly rain	42.2 mm (1.7 in)	13.0 mm (0.5 in)	9 years	35 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

1796 to 1917

Records set or tied on this calendar date in each year from 1796 to 1917. 1917 had 255 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 1917-09-17: 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).

Histogram of margins by which records were beaten on 17 September 1917
Margin	Records
0 to 10	166
10 to 20	50
20 to 30	17
30 to 40	5
40 to 50	2