Weather Records on 30 July 1917

93 weather records were set or tied worldwide on 30 July 1917. Highest significance: Barrie, CA.

Key Facts for 30 July 1917

On 30 July 1917, 93 weather records were set or tied at long-record stations worldwide.
48 were record highs and 6 were record lows, counting maximum and minimum temperature.
By timescale, 7 were all-time records, 2 monthly and 84 daily.
Barrie set an all-time record high minimum temperature of 25.0 C (77.0 F) on 30 July 1917.
Across 168 earlier years (1794 to 2026) the same calendar date averaged 442 records.

Record Map

93 stations

93 station records on 30 July 1917 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 30 July 1917: highest significance records shown on the map
Station	Country	Type	Value	Significance
Barrie	Canada	Record high minimum temperature	25.0 C (77.0 F)	40 of 100 (Notable)
Oxford	United Kingdom	Record low maximum temperature	14.0 C (57.2 F)	36 of 100 (Notable)
Stonecliffe	Canada	Record high minimum temperature	24.4 C (75.9 F)	29 of 100 (Routine)
Beatrice	Canada	Record high minimum temperature	23.9 C (75.0 F)	29 of 100 (Routine)
Port Arthur	Canada	Record high minimum temperature	21.7 C (71.1 F)	27 of 100 (Routine)
Novorossijsk	Russia	Record daily precipitation	39.1 mm (1.5 in)	21 of 100 (Routine)
Cape May 2 NW	United States	Record high maximum temperature	35.0 C (95.0 F)	21 of 100 (Routine)
Fir Glen	South Africa	Record daily precipitation	23.6 mm (0.9 in)	20 of 100 (Routine)
Jansenville	South Africa	Record daily precipitation	12.4 mm (0.5 in)	20 of 100 (Routine)
Grahamstown	South Africa	Record daily precipitation	23.6 mm (0.9 in)	20 of 100 (Routine)
Middleton (Sar)	South Africa	Record daily precipitation	12.2 mm (0.5 in)	20 of 100 (Routine)
Robe Comparison	Australia	Record daily precipitation	20.6 mm (0.8 in)	20 of 100 (Routine)
Aberdeen Rd (Sar)	South Africa	Record daily precipitation	15.2 mm (0.6 in)	20 of 100 (Routine)
Somerset East	South Africa	Record daily precipitation	18.3 mm (0.7 in)	20 of 100 (Routine)
Hogsback (Bos)	South Africa	Record daily precipitation	21.8 mm (0.9 in)	20 of 100 (Routine)
Holbrook (Rsl)	Australia	Record daily precipitation	20.8 mm (0.8 in)	20 of 100 (Routine)
Jacksonville Wb City	United States	Record daily precipitation	35.3 mm (1.4 in)	20 of 100 (Routine)
Ilulissat (Jakobshavn)	Greenland [Denmark]	Record daily precipitation	12.8 mm (0.5 in)	19 of 100 (Routine)
Quebec	Canada	Record daily precipitation	37.3 mm (1.5 in)	18 of 100 (Routine)
Montreal McGill	Canada	Record high maximum temperature	33.9 C (93.0 F)	18 of 100 (Routine)
Cullendale	South Africa	Record daily precipitation	16.5 mm (0.6 in)	18 of 100 (Routine)
Buffelsfontein 14	South Africa	Record daily precipitation	5.6 mm (0.22 in)	18 of 100 (Routine)
Concord	United States	Record high maximum temperature	36.7 C (98.1 F)	18 of 100 (Routine)
Philadelphia City	United States	Record high maximum temperature	36.1 C (97.0 F)	17 of 100 (Routine)
Nemours (Ghazaouet)	Algeria	Record low minimum temperature	16.0 C (60.8 F)	16 of 100 (Routine)
Kologha (Bos)	South Africa	Record daily precipitation	13.0 mm (0.5 in)	16 of 100 (Routine)
Nieu-Bethesda (Pol)	South Africa	Record daily precipitation	4.3 mm (0.17 in)	16 of 100 (Routine)
Lady Frere (Tnk)	South Africa	Record daily precipitation	6.4 mm (0.25 in)	16 of 100 (Routine)
Walgett (Dungalear)	Australia	Record daily precipitation	7.6 mm (0.30 in)	15 of 100 (Routine)
Tranebjerg	Denmark	Record daily precipitation	28.1 mm (1.1 in)	15 of 100 (Routine)
Heinersreuth-Vollhof	Germany	Record daily precipitation	17.3 mm (0.7 in)	14 of 100 (Routine)
Isidinge (Bos)	South Africa	Record daily precipitation	15.2 mm (0.6 in)	13 of 100 (Routine)
Komga (Pol)	South Africa	Record daily precipitation	8.9 mm (0.35 in)	13 of 100 (Routine)
Tylden "Tulden"	South Africa	Record daily precipitation	2.3 mm (0.09 in)	13 of 100 (Routine)
Cleveland 2717 Euclid	United States	Record high maximum temperature	34.4 C (93.9 F)	13 of 100 (Routine)
Burlington	United States	Record high maximum temperature	34.4 C (93.9 F)	13 of 100 (Routine)
Atlantic City Marina	United States	Record high maximum temperature	36.7 C (98.1 F)	13 of 100 (Routine)
Millicent	Australia	Record daily precipitation	9.4 mm (0.37 in)	12 of 100 (Routine)
Kremsmuenster	Austria	Record high minimum temperature	19.3 C (66.7 F)	11 of 100 (Routine)
Peddie (Mag)	South Africa	Record daily precipitation	21.1 mm (0.8 in)	11 of 100 (Routine)
Fort Beaufort	South Africa	Record daily precipitation	11.7 mm (0.5 in)	11 of 100 (Routine)
Zagreb-Gric	Croatia	Record high maximum temperature	33.8 C (92.8 F)	10 of 100 (Routine)
East London -Signal STN	South Africa	Record daily precipitation	48.8 mm (1.9 in)	10 of 100 (Routine)
Seymour (Mag)	South Africa	Record daily precipitation	12.7 mm (0.5 in)	10 of 100 (Routine)
Kieskamahoek (Pol)	South Africa	Record daily precipitation	12.4 mm (0.5 in)	10 of 100 (Routine)
Walsingham 1	South Africa	Record daily precipitation	7.6 mm (0.30 in)	10 of 100 (Routine)
Wellwood	South Africa	Record daily precipitation	4.1 mm (0.16 in)	10 of 100 (Routine)
Northfield	United States	Record high maximum temperature	34.4 C (93.9 F)	10 of 100 (Routine)
Katberg (Bos)	South Africa	Record daily precipitation	10.9 mm (0.4 in)	9 of 100 (Routine)
Vineland	United States	Record high minimum temperature	23.3 C (73.9 F)	9 of 100 (Routine)
La Crosse Wb City	United States	Record high minimum temperature	25.6 C (78.1 F)	9 of 100 (Routine)
Baltimore Customs House	United States	Record high maximum temperature	35.6 C (96.1 F)	9 of 100 (Routine)
Ny City Cntrl Park	United States	Record high maximum temperature	36.7 C (98.1 F)	9 of 100 (Routine)
Goodooga (Brenda)	Australia	Record daily precipitation	10.9 mm (0.4 in)	8 of 100 (Routine)
Taralga Post Office	Australia	Record daily precipitation	8.6 mm (0.34 in)	8 of 100 (Routine)
Port Dover	Canada	Record high maximum temperature	34.4 C (93.9 F)	8 of 100 (Routine)
Cleveland 2717 Euclid	United States	Record high minimum temperature	25.6 C (78.1 F)	8 of 100 (Routine)
State College	United States	Record high minimum temperature	22.8 C (73.0 F)	8 of 100 (Routine)
Camboon Station	Australia	Record daily precipitation	11.4 mm (0.4 in)	7 of 100 (Routine)
Calgary Int'l A	Canada	Record low minimum temperature	2.2 C (36.0 F)	7 of 100 (Routine)

Counts by Type and Timescale

93 records

Records set or tied on 30 July 1917 by type: Highest daily maximum 21, Lowest daily maximum 2, Highest daily minimum 27, Lowest daily minimum 4, Heaviest daily rainfall 39.

Records on 30 July 1917 by type
Record type	Records
Highest daily maximum	21
Lowest daily maximum	2
Highest daily minimum	27
Lowest daily minimum	4
Heaviest daily rainfall	39
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 30 July 1917 by timescale: all-time 7, monthly 2, daily 84.

How Much Records Were Beaten By

74 broken records

Margins by which the 74 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 21.3. Ties are not counted.

Top 20 by Significance

30 July 1917

Top 20 records on 30 July 1917 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 July 1917	Barrie, CA	all-time high min	25.0 C (77.0 F)	0.6 C (1.1 F)	49 years	40 of 100 (Notable)
30 July 1917	Oxford, GB	daily low max	14.0 C (57.2 F)	0.2 C (0.4 F)	88 years	36 of 100 (Notable)
30 July 1917	Stonecliffe, CA	all-time high min	24.4 C (75.9 F)	2.2 C (4.0 F)	0 years	29 of 100 (Routine)
30 July 1917	Beatrice, CA	all-time high min	23.9 C (75.0 F)	1.7 C (3.1 F)	4 years	29 of 100 (Routine)
30 July 1917	Port Arthur, CA	all-time high min	21.7 C (71.1 F)	1.1 C (2.0 F)	0 years	27 of 100 (Routine)
30 July 1917	Novorossijsk, RU	daily rain	39.1 mm (1.5 in)	14.6 mm (0.6 in)	11 years	21 of 100 (Routine)
30 July 1917	Cape May 2 NW, US	monthly high max	35.0 C (95.0 F)	0.6 C (1.1 F)	17 years	21 of 100 (Routine)
30 July 1917	Fir Glen, ZA	daily rain	23.6 mm (0.9 in)	19.3 mm (0.8 in)	34 years	20 of 100 (Routine)
30 July 1917	Jansenville, ZA	daily rain	12.4 mm (0.5 in)	9.4 mm (0.37 in)	24 years	20 of 100 (Routine)
30 July 1917	Grahamstown, ZA	daily rain	23.6 mm (0.9 in)	21.3 mm (0.8 in)	16 years	20 of 100 (Routine)
30 July 1917	Middleton (Sar), ZA	daily rain	12.2 mm (0.5 in)	11.9 mm (0.5 in)	34 years	20 of 100 (Routine)
30 July 1917	Robe Comparison, AU	daily rain	20.6 mm (0.8 in)	10.2 mm (0.4 in)	22 years	20 of 100 (Routine)
30 July 1917	Aberdeen Rd (Sar), ZA	daily rain	15.2 mm (0.6 in)	15.2 mm (0.6 in)	31 years	20 of 100 (Routine)
30 July 1917	Somerset East, ZA	daily rain	18.3 mm (0.7 in)	9.4 mm (0.37 in)	38 years	20 of 100 (Routine)
30 July 1917	Hogsback (Bos), ZA	daily rain	21.8 mm (0.9 in)	14.9 mm (0.6 in)	7 years	20 of 100 (Routine)
30 July 1917	Holbrook (Rsl), AU	daily rain	20.8 mm (0.8 in)	10.4 mm (0.4 in)	22 years	20 of 100 (Routine)
30 July 1917	Jacksonville Wb City, US	daily rain	35.3 mm (1.4 in)	7.1 mm (0.28 in)	36 years	20 of 100 (Routine)
30 July 1917	Ilulissat (Jakobshavn), GL	daily rain	12.8 mm (0.5 in)	2.4 mm (0.09 in)	34 years	19 of 100 (Routine)
30 July 1917	Quebec, CA	daily rain	37.3 mm (1.5 in)	8.9 mm (0.35 in)	11 years	18 of 100 (Routine)
30 July 1917	Montreal McGill, CA	daily high max	33.9 C (93.0 F)	2.2 C (4.0 F)	29 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

1794 to 1917

Records set or tied on this calendar date in each year from 1794 to 1917. 1917 had 93 records.

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

Records on 07-30 in each year
Year	Records
1794	2
1797	1
1827	1
1828	2
1829	1
1830	1
1834	1
1837	2
1838	1
1840	1
1841	1
1843	1
1854	1
1857	1
1858	2
1860	4
1863	1
1867	1
1868	1
1869	2
1870	1
1874	2
1875	1
1876	1
1877	2
1879	1
1880	2
1885	3
1886	5
1887	6
1888	5
1889	1
1890	2
1891	1
1892	1
1893	10
1894	6
1895	2
1896	2
1897	4
1898	8
1899	2
1900	4
1901	11
1902	6
1903	25
1904	17
1905	29
1906	22
1907	11
1908	23
1909	30
1910	8
1911	54
1912	21
1913	34
1914	52
1915	26
1916	150
1917	93
1918	42
1919	19
1920	188
1921	193
1922	40
1923	428
1924	80
1925	275
1926	186
1927	109
1928	210
1929	221
1930	170
1931	432
1932	275
1933	451
1934	619
1935	340
1936	452
1937	245
1938	388
1939	395
1940	562
1941	371
1942	304
1943	397
1944	289
1945	299
1946	409
1947	394
1948	489
1949	512
1950	552
1951	322
1952	581
1953	345
1954	504
1955	787
1956	506
1957	289
1958	344
1959	391
1960	793
1961	511
1962	378
1963	308
1964	483
1965	978
1966	527
1967	282
1968	530
1969	506
1970	431
1971	2,319
1972	758
1973	434
1974	569
1975	1,048
1976	590
1977	641
1978	646
1979	761
1980	962
1981	851
1982	821
1983	904
1984	997
1985	1,029
1986	952
1987	1,084
1988	826
1989	1,227
1990	795
1991	734
1992	1,003
1993	965
1994	1,631
1995	1,207
1996	1,317
1997	933
1998	1,240
1999	1,456
2000	1,030
2001	1,400
2002	1,346
2003	1,163
2004	936
2005	788
2006	1,103
2007	1,160
2008	763
2009	1,328
2010	1,331
2011	1,003
2012	731
2013	737
2014	1,199
2015	682
2016	460
2017	464
2018	1,038
2019	486
2020	763
2021	839
2022	845
2023	683
2024	705
2025	869
2026	1,001

Download the Data

Data for records on 1917-07-30: 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	48
5 to 10	16
10 to 15	7
15 to 20	2
20 to 25	1