Weather Records on 31 July 1917

126 weather records were set or tied worldwide on 31 July 1917. Highest significance: Helmond, NL.

Key Facts for 31 July 1917

On 31 July 1917, 126 weather records were set or tied at long-record stations worldwide.
79 were record highs and 7 were record lows, counting maximum and minimum temperature.
By timescale, 10 were all-time records, 4 monthly and 112 daily.
Helmond set a daily record precipitation of 38.0 mm (1.5 in) on 31 July 1917.
Across 155 earlier years (1804 to 2026) the same calendar date averaged 473 records.

Record Map

126 stations

126 station records on 31 July 1917 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 31 July 1917: highest significance records shown on the map
Station	Country	Type	Value	Significance
Helmond	Netherlands	Record daily precipitation	38.0 mm (1.5 in)	55 of 100 (Notable)
Winterswijk	Netherlands	Record daily precipitation	41.3 mm (1.6 in)	53 of 100 (Notable)
Putten (Gld)	Netherlands	Record daily precipitation	71.9 mm (2.8 in)	51 of 100 (Notable)
Uccle	Belgium	Record daily precipitation	36.8 mm (1.4 in)	50 of 100 (Notable)
Wrixum/Fohr	Germany	Record daily precipitation	40.4 mm (1.6 in)	44 of 100 (Notable)
Oxford	United Kingdom	Record low maximum temperature	13.1 C (55.6 F)	38 of 100 (Notable)
Arnsberg	Germany	Record daily precipitation	29.8 mm (1.2 in)	36 of 100 (Notable)
Stonecliffe	Canada	Record high minimum temperature	27.8 C (82.0 F)	33 of 100 (Routine)
Cape May 2 NW	United States	Record high maximum temperature	36.7 C (98.1 F)	33 of 100 (Routine)
Setauket Strong	United States	Record high minimum temperature	27.2 C (81.0 F)	32 of 100 (Routine)
Kerkwerve	Netherlands	Record daily precipitation	26.0 mm (1.0 in)	31 of 100 (Routine)
Roermond	Netherlands	Record daily precipitation	55.4 mm (2.2 in)	31 of 100 (Routine)
Middletown 4 W	United States	Record high minimum temperature	28.3 C (82.9 F)	30 of 100 (Routine)
Genoa	Italy	Record daily precipitation	51.3 mm (2.0 in)	28 of 100 (Routine)
Blue Hill Coop	United States	Record high minimum temperature	25.6 C (78.1 F)	28 of 100 (Routine)
Huron Rgnl AP	United States	Record daily precipitation	74.4 mm (2.9 in)	27 of 100 (Routine)
Toronto	Canada	Record high maximum temperature	33.3 C (91.9 F)	25 of 100 (Routine)
Barrie	Canada	Record high maximum temperature	33.9 C (93.0 F)	24 of 100 (Routine)
Stratford	Canada	Record high maximum temperature	35.0 C (95.0 F)	24 of 100 (Routine)
Wilmington Wb City	United States	Record high maximum temperature	36.1 C (97.0 F)	24 of 100 (Routine)
Hamilton	Canada	Record high maximum temperature	35.0 C (95.0 F)	23 of 100 (Routine)
Saint John	Canada	Record high maximum temperature	30.0 C (86.0 F)	23 of 100 (Routine)
Zagreb-Gric	Croatia	Record high maximum temperature	35.4 C (95.7 F)	23 of 100 (Routine)
World Trade Ctr	United States	Record high minimum temperature	26.7 C (80.1 F)	23 of 100 (Routine)
Milwaukee Wb City	United States	Record high minimum temperature	25.6 C (78.1 F)	21 of 100 (Routine)
Philadelphia City	United States	Record high minimum temperature	26.7 C (80.1 F)	21 of 100 (Routine)
Newark Liberty Intl AP	United States	Record high minimum temperature	25.6 C (78.1 F)	21 of 100 (Routine)
Ny City Cntrl Park	United States	Record high minimum temperature	27.8 C (82.0 F)	21 of 100 (Routine)
Hoofddorp	Netherlands	Record daily precipitation	16.4 mm (0.6 in)	20 of 100 (Routine)
Normanville	Australia	Record daily precipitation	13.0 mm (0.5 in)	20 of 100 (Routine)
Pittsworth	Australia	Record daily precipitation	15.5 mm (0.6 in)	20 of 100 (Routine)
Cleveland 2717 Euclid	United States	Record high minimum temperature	26.7 C (80.1 F)	20 of 100 (Routine)
Escanaba	United States	Record high minimum temperature	20.6 C (69.1 F)	20 of 100 (Routine)
Green Bay	United States	Record high minimum temperature	22.2 C (72.0 F)	20 of 100 (Routine)
Jonkoping	Sweden	Record high minimum temperature	16.5 C (61.7 F)	19 of 100 (Routine)
Setauket Strong	United States	Record high maximum temperature	34.4 C (93.9 F)	19 of 100 (Routine)
Astoria	United States	Record low minimum temperature	8.9 C (48.0 F)	19 of 100 (Routine)
Calgary Int'l A	Canada	Record low minimum temperature	1.1 C (34.0 F)	18 of 100 (Routine)
Winnipeg St Johns Coll	Canada	Record daily precipitation	21.1 mm (0.8 in)	18 of 100 (Routine)
Welland	Canada	Record high maximum temperature	32.8 C (91.0 F)	18 of 100 (Routine)
Milwaukee Wb City	United States	Record high maximum temperature	36.7 C (98.1 F)	18 of 100 (Routine)
Baltimore Customs House	United States	Record high maximum temperature	37.2 C (99.0 F)	18 of 100 (Routine)
Dubuque River	United States	Record high maximum temperature	36.7 C (98.1 F)	18 of 100 (Routine)
Guelph Oac	Canada	Record high maximum temperature	34.4 C (93.9 F)	17 of 100 (Routine)
Toowoomba	Australia	Record daily precipitation	9.9 mm (0.39 in)	16 of 100 (Routine)
Miles Post Office	Australia	Record daily precipitation	17.8 mm (0.7 in)	16 of 100 (Routine)
Vineland	United States	Record high maximum temperature	37.8 C (100.0 F)	16 of 100 (Routine)
Madison Wb City	United States	Record high maximum temperature	35.0 C (95.0 F)	16 of 100 (Routine)
Green Bay	United States	Record high maximum temperature	35.6 C (96.1 F)	16 of 100 (Routine)
Casino Airport	Australia	Record daily precipitation	9.7 mm (0.38 in)	15 of 100 (Routine)
Ottawa	Canada	Record high maximum temperature	34.4 C (93.9 F)	15 of 100 (Routine)
Bird Rocks	Canada	Record daily precipitation	17.8 mm (0.7 in)	15 of 100 (Routine)
Hvar	Croatia	Record high maximum temperature	32.8 C (91.0 F)	15 of 100 (Routine)
Blue Hill Coop	United States	Record high maximum temperature	35.0 C (95.0 F)	15 of 100 (Routine)
Morris W Cntrl Rsch & Outreach	United States	Record daily precipitation	36.3 mm (1.4 in)	15 of 100 (Routine)
Toledo Blade	United States	Record high maximum temperature	36.1 C (97.0 F)	15 of 100 (Routine)
Nemours (Ghazaouet)	Algeria	Record low minimum temperature	15.0 C (59.0 F)	14 of 100 (Routine)
Allora Post Office	Australia	Record daily precipitation	10.2 mm (0.4 in)	14 of 100 (Routine)
Goondiwindi Post Office	Australia	Record daily precipitation	10.9 mm (0.4 in)	14 of 100 (Routine)
Stanthorpe Leslie Parade	Australia	Record daily precipitation	16.0 mm (0.6 in)	14 of 100 (Routine)

Counts by Type and Timescale

126 records

Records set or tied on 31 July 1917 by type: Highest daily maximum 45, Lowest daily maximum 4, Highest daily minimum 34, Lowest daily minimum 3, Heaviest daily rainfall 40.

Records on 31 July 1917 by type
Record type	Records
Highest daily maximum	45
Lowest daily maximum	4
Highest daily minimum	34
Lowest daily minimum	3
Heaviest daily rainfall	40
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 31 July 1917 by timescale: all-time 10, monthly 4, daily 112.

How Much Records Were Beaten By

105 broken records

Margins by which the 105 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 33.2. Ties are not counted.

Top 20 by Significance

31 July 1917

Top 20 records on 31 July 1917 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
31 July 1917	Helmond, NL	daily rain	38.0 mm (1.5 in)	33.2 mm (1.3 in)	33 years	55 of 100 (Notable)
31 July 1917	Winterswijk, NL	daily rain	41.3 mm (1.6 in)	29.3 mm (1.2 in)	33 years	53 of 100 (Notable)
31 July 1917	Putten (Gld), NL	all-time rain	71.9 mm (2.8 in)	14.7 mm (0.6 in)	14 years	51 of 100 (Notable)
31 July 1917	Uccle, BE	daily rain	36.8 mm (1.4 in)	27.3 mm (1.1 in)	25 years	50 of 100 (Notable)
31 July 1917	Wrixum/Fohr, DE	daily rain	40.4 mm (1.6 in)	25.4 mm (1.0 in)	11 years	44 of 100 (Notable)
31 July 1917	Oxford, GB	daily low max	13.1 C (55.6 F)	2.5 C (4.5 F)	72 years	38 of 100 (Notable)
31 July 1917	Arnsberg, DE	daily rain	29.8 mm (1.2 in)	17.7 mm (0.7 in)	35 years	36 of 100 (Notable)
31 July 1917	Stonecliffe, CA	all-time high min	27.8 C (82.0 F)	3.4 C (6.1 F)	0 years	33 of 100 (Routine)
31 July 1917	Cape May 2 NW, US	all-time high max	36.7 C (98.1 F)	1.1 C (2.0 F)	16 years	33 of 100 (Routine)
31 July 1917	Setauket Strong, US	all-time high min	27.2 C (81.0 F)	1.6 C (2.9 F)	12 years	32 of 100 (Routine)
31 July 1917	Kerkwerve, NL	daily rain	26.0 mm (1.0 in)	12.5 mm (0.5 in)	28 years	31 of 100 (Routine)
31 July 1917	Roermond, NL	all-time rain	55.4 mm (2.2 in)	1.0 mm (0.04 in)	16 years	31 of 100 (Routine)
31 July 1917	Middletown 4 W, US	all-time high min	28.3 C (82.9 F)	0.5 C (0.9 F)	16 years	30 of 100 (Routine)
31 July 1917	Genoa, IT	daily rain	51.3 mm (2.0 in)	18.8 mm (0.7 in)	20 years	28 of 100 (Routine)
31 July 1917	Blue Hill Coop, US	all-time high min	25.6 C (78.1 F)	1.2 C (2.2 F)	6 years	28 of 100 (Routine)
31 July 1917	Huron Rgnl AP, US	monthly rain	74.4 mm (2.9 in)	7.9 mm (0.31 in)	24 years	27 of 100 (Routine)
31 July 1917	Toronto, CA	daily high max	33.3 C (91.9 F)	1.1 C (2.0 F)	52 years	25 of 100 (Routine)
31 July 1917	Barrie, CA	daily high max	33.9 C (93.0 F)	2.8 C (5.0 F)	45 years	24 of 100 (Routine)
31 July 1917	Stratford, CA	daily high max	35.0 C (95.0 F)	3.3 C (5.9 F)	39 years	24 of 100 (Routine)
31 July 1917	Wilmington Wb City, US	daily high max	36.1 C (97.0 F)	2.2 C (4.0 F)	41 years	24 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

1804 to 1917

Records set or tied on this calendar date in each year from 1804 to 1917. 1917 had 126 records.

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

Records on 07-31 in each year
Year	Records
1804	1
1815	1
1816	1
1828	1
1834	1
1839	1
1840	1
1841	2
1851	1
1858	2
1860	4
1863	1
1866	1
1873	2
1876	1
1879	1
1884	1
1885	1
1886	1
1887	5
1889	2
1890	2
1891	1
1892	1
1893	3
1894	2
1896	2
1897	2
1898	5
1900	1
1901	3
1902	4
1903	16
1904	12
1905	10
1906	14
1907	17
1908	22
1909	15
1910	21
1911	29
1912	14
1913	31
1914	28
1915	71
1916	63
1917	126
1918	39
1919	27
1920	168
1921	112
1922	24
1923	236
1924	97
1925	349
1926	226
1927	161
1928	145
1929	134
1930	143
1931	441
1932	314
1933	504
1934	449
1935	418
1936	548
1937	297
1938	417
1939	357
1940	415
1941	323
1942	342
1943	342
1944	312
1945	499
1946	426
1947	341
1948	341
1949	406
1950	511
1951	364
1952	472
1953	414
1954	459
1955	813
1956	574
1957	268
1958	374
1959	424
1960	622
1961	504
1962	348
1963	294
1964	637
1965	858
1966	606
1967	326
1968	637
1969	440
1970	576
1971	1,850
1972	667
1973	583
1974	363
1975	1,386
1976	530
1977	543
1978	754
1979	501
1980	1,047
1981	672
1982	767
1983	901
1984	777
1985	1,065
1986	1,021
1987	934
1988	940
1989	1,753
1990	911
1991	647
1992	1,169
1993	1,031
1994	1,207
1995	1,223
1996	1,084
1997	984
1998	1,195
1999	1,643
2000	1,001
2001	1,414
2002	1,080
2003	1,157
2004	779
2005	742
2006	1,405
2007	1,023
2008	911
2009	1,156
2010	1,485
2011	1,040
2012	712
2013	469
2014	1,000
2015	948
2016	501
2017	485
2018	1,135
2019	551
2020	1,034
2021	1,020
2022	861
2023	671
2024	748
2025	836
2026	754

Download the Data

Data for records on 1917-07-31: 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	82
5 to 10	13
10 to 15	3
15 to 20	3
20 to 25	0
25 to 30	3
30 to 35	1