Weather Records on 9 August 1917

46 weather records were set or tied worldwide on 9 August 1917. Highest significance: Putbus, DE.

Key Facts for 9 August 1917

On 9 August 1917, 46 weather records were set or tied at long-record stations worldwide.
8 were record highs and 10 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 1 monthly and 45 daily.
Putbus set a daily record precipitation of 48.0 mm (1.9 in) on 9 August 1917.
Across 156 earlier years (1798 to 2026) the same calendar date averaged 477 records.

Record Map

46 stations

46 station records on 9 August 1917 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 9 August 1917: highest significance records shown on the map
Station	Country	Type	Value	Significance
Putbus	Germany	Record daily precipitation	48.0 mm (1.9 in)	64 of 100 (Major)
Montreal McGill	Canada	Record daily precipitation	76.2 mm (3.0 in)	55 of 100 (Notable)
Zerbst	Germany	Record daily precipitation	25.3 mm (1.0 in)	46 of 100 (Notable)
Blue Hill Coop	United States	Record daily precipitation	41.1 mm (1.6 in)	40 of 100 (Notable)
Bad Muskau	Germany	Record daily precipitation	55.2 mm (2.2 in)	32 of 100 (Routine)
Concord	United States	Record daily precipitation	31.2 mm (1.2 in)	31 of 100 (Routine)
Sandvig	Denmark	Record high maximum temperature	26.0 C (78.8 F)	23 of 100 (Routine)
Stratford	Canada	Record low maximum temperature	18.3 C (64.9 F)	21 of 100 (Routine)
Magdeburg	Germany	Record daily precipitation	13.7 mm (0.5 in)	20 of 100 (Routine)
Karlsruhe	Germany	Record daily precipitation	25.8 mm (1.0 in)	19 of 100 (Routine)
Philipstown (Tnk)	South Africa	Record daily precipitation	7.9 mm (0.31 in)	17 of 100 (Routine)
Anticosti West Point	Canada	Record daily precipitation	20.8 mm (0.8 in)	16 of 100 (Routine)
Griquatown (Tnk)	South Africa	Record daily precipitation	3.0 mm (0.12 in)	16 of 100 (Routine)
Swift Current	Canada	Record low minimum temperature	2.2 C (36.0 F)	15 of 100 (Routine)
Heinersreuth-Vollhof	Germany	Record daily precipitation	22.3 mm (0.9 in)	15 of 100 (Routine)
Lake Cochituate	United States	Record daily precipitation	16.8 mm (0.7 in)	15 of 100 (Routine)
Huron Rgnl AP	United States	Record low minimum temperature	6.1 C (43.0 F)	15 of 100 (Routine)
Innisfail	Australia	Record daily precipitation	29.2 mm (1.1 in)	13 of 100 (Routine)
Marseille Obs. Palais-Lonchamp	France	Record daily precipitation	0.6 mm (0.02 in)	13 of 100 (Routine)
Arnsberg	Germany	Record daily precipitation	17.1 mm (0.7 in)	13 of 100 (Routine)
Umea	Sweden	Record high minimum temperature	16.0 C (60.8 F)	13 of 100 (Routine)
Santa Fe	United States	Record high minimum temperature	20.0 C (68.0 F)	13 of 100 (Routine)
Burlington	United States	Record daily precipitation	26.2 mm (1.0 in)	13 of 100 (Routine)
Bamberg (Sternwarte)	Germany	Record daily precipitation	17.5 mm (0.7 in)	12 of 100 (Routine)
Ottawa	Canada	Record daily precipitation	13.7 mm (0.5 in)	11 of 100 (Routine)
Colesberg (Tnk)	South Africa	Record daily precipitation	9.4 mm (0.37 in)	11 of 100 (Routine)
Koffiefontein (Pol)	South Africa	Record daily precipitation	11.7 mm (0.5 in)	11 of 100 (Routine)
Karesuando	Sweden	Record high maximum temperature	28.0 C (82.4 F)	11 of 100 (Routine)
Cornwall	United States	Record daily precipitation	16.5 mm (0.6 in)	11 of 100 (Routine)
Concordia ASOS	United States	Record low maximum temperature	22.8 C (73.0 F)	10 of 100 (Routine)
Harnosand	Sweden	Record high minimum temperature	16.5 C (61.7 F)	9 of 100 (Routine)
Perth Regional Office	Australia	Record daily precipitation	32.5 mm (1.3 in)	8 of 100 (Routine)
Lindsay	Canada	Record low maximum temperature	18.9 C (66.0 F)	8 of 100 (Routine)
Herberton White St	Australia	Record daily precipitation	3.8 mm (0.15 in)	7 of 100 (Routine)
Douglas	South Africa	Record daily precipitation	6.1 mm (0.24 in)	7 of 100 (Routine)
Lincoln UNIV Pwr Plt	United States	Record low maximum temperature	22.2 C (72.0 F)	7 of 100 (Routine)
Zametchino	Russia	Record high minimum temperature	17.1 C (62.8 F)	6 of 100 (Routine)
Oestersund-Froesoen	Sweden	Record high minimum temperature	15.0 C (59.0 F)	6 of 100 (Routine)
Halmstad	Sweden	Record high maximum temperature	26.0 C (78.8 F)	5 of 100 (Routine)
Port Jervis	United States	Record daily precipitation	8.1 mm (0.32 in)	5 of 100 (Routine)
Port Stanley	Canada	Record low maximum temperature	20.6 C (69.1 F)	3 of 100 (Routine)
London South	Canada	Record low maximum temperature	19.4 C (66.9 F)	3 of 100 (Routine)
Bic	Canada	Record daily precipitation	20.3 mm (0.8 in)	3 of 100 (Routine)
Bowen Post Office	Australia	Record daily precipitation	0.5 mm (0.02 in)	2 of 100 (Routine)
Morris W Cntrl Rsch & Outreach	United States	Record low minimum temperature	6.1 C (43.0 F)	2 of 100 (Routine)
Sacramento 5 ESE	United States	Record low minimum temperature	10.0 C (50.0 F)	1 of 100 (Routine)

Counts by Type and Timescale

46 records

Records set or tied on 9 August 1917 by type: Highest daily maximum 3, Lowest daily maximum 6, Highest daily minimum 5, Lowest daily minimum 4, Heaviest daily rainfall 28.

Records on 9 August 1917 by type
Record type	Records
Highest daily maximum	3
Lowest daily maximum	6
Highest daily minimum	5
Lowest daily minimum	4
Heaviest daily rainfall	28
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 9 August 1917 by timescale: all-time 0, monthly 1, daily 45.

How Much Records Were Beaten By

40 broken records

Margins by which the 40 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 56.9. Ties are not counted.

Top 20 by Significance

9 August 1917

Top 20 records on 9 August 1917 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
9 August 1917	Putbus, DE	daily rain	48.0 mm (1.9 in)	36.7 mm (1.4 in)	61 years	64 of 100 (Major)
9 August 1917	Montreal McGill, CA	daily rain	76.2 mm (3.0 in)	56.9 mm (2.2 in)	39 years	55 of 100 (Notable)
9 August 1917	Zerbst, DE	daily rain	25.3 mm (1.0 in)	21.0 mm (0.8 in)	19 years	46 of 100 (Notable)
9 August 1917	Blue Hill Coop, US	daily rain	41.1 mm (1.6 in)	35.8 mm (1.4 in)	27 years	40 of 100 (Notable)
9 August 1917	Bad Muskau, DE	monthly rain	55.2 mm (2.2 in)	11.2 mm (0.4 in)	5 years	32 of 100 (Routine)
9 August 1917	Concord, US	daily rain	31.2 mm (1.2 in)	18.5 mm (0.7 in)	39 years	31 of 100 (Routine)
9 August 1917	Sandvig, DK	daily high max	26.0 C (78.8 F)	3.6 C (6.5 F)	19 years	23 of 100 (Routine)
9 August 1917	Stratford, CA	daily low max	18.3 C (64.9 F)	0.6 C (1.1 F)	50 years	21 of 100 (Routine)
9 August 1917	Magdeburg, DE	daily rain	13.7 mm (0.5 in)	4.1 mm (0.16 in)	30 years	20 of 100 (Routine)
9 August 1917	Karlsruhe, DE	daily rain	25.8 mm (1.0 in)	10.5 mm (0.4 in)	8 years	19 of 100 (Routine)
9 August 1917	Philipstown (Tnk), ZA	daily rain	7.9 mm (0.31 in)	4.1 mm (0.16 in)	25 years	17 of 100 (Routine)
9 August 1917	Anticosti West Point, CA	daily rain	20.8 mm (0.8 in)	11.9 mm (0.5 in)	4 years	16 of 100 (Routine)
9 August 1917	Griquatown (Tnk), ZA	daily rain	3.0 mm (0.12 in)	3.0 mm (0.12 in)	33 years	16 of 100 (Routine)
9 August 1917	Swift Current, CA	daily low min	2.2 C (36.0 F)	1.7 C (3.1 F)	29 years	15 of 100 (Routine)
9 August 1917	Heinersreuth-Vollhof, DE	daily rain	22.3 mm (0.9 in)	5.9 mm (0.23 in)	14 years	15 of 100 (Routine)
9 August 1917	Lake Cochituate, US	daily rain	16.8 mm (0.7 in)	6.9 mm (0.27 in)	26 years	15 of 100 (Routine)
9 August 1917	Huron Rgnl AP, US	daily low min	6.1 C (43.0 F)	1.1 C (2.0 F)	34 years	15 of 100 (Routine)
9 August 1917	Innisfail, AU	daily rain	29.2 mm (1.1 in)	4.3 mm (0.17 in)	29 years	13 of 100 (Routine)
9 August 1917	Marseille Obs. Palais-Lonchamp, FR	daily rain	0.6 mm (0.02 in)	0.6 mm (0.02 in)	35 years	13 of 100 (Routine)
9 August 1917	Arnsberg, DE	daily rain	17.1 mm (0.7 in)	3.3 mm (0.13 in)	20 years	13 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

1798 to 1917

Records set or tied on this calendar date in each year from 1798 to 1917. 1917 had 46 records.

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

Records on 08-09 in each year
Year	Records
1798	2
1800	1
1838	1
1845	3
1856	1
1859	3
1861	1
1863	2
1868	1
1870	1
1871	1
1873	1
1875	1
1878	1
1881	3
1884	2
1886	1
1887	1
1888	1
1889	1
1890	1
1891	4
1892	4
1893	3
1894	3
1895	1
1896	3
1897	7
1898	12
1899	4
1900	8
1901	3
1902	3
1903	6
1904	9
1905	5
1906	15
1907	9
1908	9
1909	51
1910	16
1911	44
1912	47
1913	76
1914	21
1915	61
1916	37
1917	46
1918	210
1919	49
1920	289
1921	36
1922	70
1923	73
1924	143
1925	307
1926	142
1927	391
1928	220
1929	127
1930	570
1931	399
1932	194
1933	250
1934	654
1935	587
1936	519
1937	351
1938	379
1939	480
1940	455
1941	372
1942	527
1943	366
1944	647
1945	365
1946	307
1947	544
1948	440
1949	715
1950	407
1951	405
1952	317
1953	363
1954	377
1955	433
1956	278
1957	347
1958	417
1959	453
1960	459
1961	347
1962	636
1963	500
1964	755
1965	632
1966	568
1967	457
1968	1,037
1969	527
1970	751
1971	543
1972	1,089
1973	547
1974	660
1975	790
1976	883
1977	453
1978	784
1979	630
1980	945
1981	941
1982	935
1983	839
1984	683
1985	714
1986	509
1987	927
1988	625
1989	2,082
1990	799
1991	988
1992	1,699
1993	702
1994	1,097
1995	1,417
1996	864
1997	1,446
1998	969
1999	1,370
2000	1,237
2001	1,485
2002	1,167
2003	1,344
2004	941
2005	1,001
2006	828
2007	1,687
2008	667
2009	1,028
2010	1,393
2011	1,177
2012	843
2013	761
2014	531
2015	595
2016	634
2017	773
2018	972
2019	717
2020	643
2021	523
2022	793
2023	820
2024	952
2025	799
2026	1,019

Download the Data

Data for records on 1917-08-09: 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 10	32
10 to 20	4
20 to 30	1
30 to 40	2
40 to 50	0
50 to 60	1