Weather Records on 30 June 1917

39 weather records were set or tied worldwide on 30 June 1917. Highest significance: Saint John, CA.

Key Facts for 30 June 1917

On 30 June 1917, 39 weather records were set or tied at long-record stations worldwide.
13 were record highs and 7 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 5 monthly and 34 daily.
Saint John set a daily record precipitation of 38.1 mm (1.5 in) on 30 June 1917.
Across 160 earlier years (1826 to 2026) the same calendar date averaged 452 records.

Record Map

39 stations

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

Weather records on 30 June 1917: highest significance records shown on the map
Station	Country	Type	Value	Significance
Saint John	Canada	Record daily precipitation	38.1 mm (1.5 in)	36 of 100 (Notable)
Weldon	United States	Record daily precipitation	47.2 mm (1.9 in)	28 of 100 (Routine)
Fredericton Unb	Canada	Record daily precipitation	26.4 mm (1.0 in)	24 of 100 (Routine)
Holmogadd A	Sweden	Record daily precipitation	17.9 mm (0.7 in)	20 of 100 (Routine)
Kola-In-Murman	Russia	Record daily precipitation	24.6 mm (1.0 in)	20 of 100 (Routine)
Clanwilliam (Pol)	South Africa	Record daily precipitation	7.6 mm (0.30 in)	20 of 100 (Routine)
Chatham	Canada	Record daily precipitation	23.6 mm (0.9 in)	20 of 100 (Routine)
Point Escuminac	Canada	Record daily precipitation	30.2 mm (1.2 in)	20 of 100 (Routine)
St. Petersburg	Russia	Record high maximum temperature	31.6 C (88.9 F)	19 of 100 (Routine)
St. Petersburg	Russia	Record high minimum temperature	20.2 C (68.4 F)	18 of 100 (Routine)
Caledon (Pol)	South Africa	Record daily precipitation	16.5 mm (0.6 in)	18 of 100 (Routine)
Piketberg (Pol)	South Africa	Record daily precipitation	26.2 mm (1.0 in)	17 of 100 (Routine)
Berlin-Dahlem	Germany	Record high minimum temperature	23.0 C (73.4 F)	16 of 100 (Routine)
Stellenbosch (Tnk)	South Africa	Record daily precipitation	18.3 mm (0.7 in)	15 of 100 (Routine)
Montgomery Wb City	United States	Record low minimum temperature	18.9 C (66.0 F)	15 of 100 (Routine)
Zagreb-Gric	Croatia	Record high maximum temperature	33.4 C (92.1 F)	14 of 100 (Routine)
Kremsmuenster	Austria	Record high minimum temperature	17.9 C (64.2 F)	13 of 100 (Routine)
Koebenhavn: Landbohojskolen-1	Denmark	Record high minimum temperature	17.1 C (62.8 F)	11 of 100 (Routine)
Oudtshoorn	South Africa	Record daily precipitation	4.1 mm (0.16 in)	11 of 100 (Routine)
Dublin Phoenix Park	Ireland	Record low minimum temperature	2.2 C (36.0 F)	10 of 100 (Routine)
Tartu	Estonia	Record high minimum temperature	17.2 C (63.0 F)	10 of 100 (Routine)
Bad Muskau	Germany	Record daily precipitation	34.1 mm (1.3 in)	10 of 100 (Routine)
Malmesbury	South Africa	Record daily precipitation	21.1 mm (0.8 in)	10 of 100 (Routine)
Tulbagh (Pol)	South Africa	Record daily precipitation	16.0 mm (0.6 in)	10 of 100 (Routine)
Wilmington Wb City	United States	Record low maximum temperature	25.6 C (78.1 F)	10 of 100 (Routine)
Concordia ASOS	United States	Record high minimum temperature	25.6 C (78.1 F)	10 of 100 (Routine)
Heinersreuth-Vollhof	Germany	Record high minimum temperature	16.1 C (61.0 F)	9 of 100 (Routine)
Lincoln UNIV Pwr Plt	United States	Record high maximum temperature	38.9 C (102.0 F)	9 of 100 (Routine)
Vestervig	Denmark	Record low minimum temperature	8.0 C (46.4 F)	8 of 100 (Routine)
Springbok	South Africa	Record daily precipitation	7.6 mm (0.30 in)	8 of 100 (Routine)
Haparanda	Sweden	Record low maximum temperature	12.5 C (54.5 F)	7 of 100 (Routine)
Ferrara	Italy	Record daily precipitation	8.6 mm (0.34 in)	5 of 100 (Routine)
Concordia ASOS	United States	Record high maximum temperature	40.0 C (104.0 F)	4 of 100 (Routine)
Kristianstad	Sweden	Record high minimum temperature	15.0 C (59.0 F)	3 of 100 (Routine)
Stornoway Airport	United Kingdom	Record low minimum temperature	5.6 C (42.1 F)	3 of 100 (Routine)
Deniliquin (Wilkinson St)	Australia	Record high minimum temperature	10.0 C (50.0 F)	2 of 100 (Routine)
Stony Mountain	Canada	Record daily precipitation	12.7 mm (0.5 in)	1 of 100 (Routine)
Leipzig-Holzhausen	Germany	Record daily precipitation	21.7 mm (0.9 in)	1 of 100 (Routine)
Durham	United Kingdom	Record low minimum temperature	3.9 C (39.0 F)	1 of 100 (Routine)

Counts by Type and Timescale

39 records

Records set or tied on 30 June 1917 by type: Highest daily maximum 4, Lowest daily maximum 2, Highest daily minimum 9, Lowest daily minimum 5, Heaviest daily rainfall 19.

Records on 30 June 1917 by type
Record type	Records
Highest daily maximum	4
Lowest daily maximum	2
Highest daily minimum	9
Lowest daily minimum	5
Heaviest daily rainfall	19
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 30 June 1917 by timescale: all-time 0, monthly 5, daily 34.

How Much Records Were Beaten By

32 broken records

Margins by which the 32 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 26.9. Ties are not counted.

Top 20 by Significance

30 June 1917

Top 20 records on 30 June 1917 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 June 1917	Saint John, CA	daily rain	38.1 mm (1.5 in)	26.9 mm (1.1 in)	28 years	36 of 100 (Notable)
30 June 1917	Weldon, US	daily rain	47.2 mm (1.9 in)	25.6 mm (1.0 in)	22 years	28 of 100 (Routine)
30 June 1917	Fredericton Unb, CA	daily rain	26.4 mm (1.0 in)	13.7 mm (0.5 in)	26 years	24 of 100 (Routine)
30 June 1917	Holmogadd A, SE	daily rain	17.9 mm (0.7 in)	11.9 mm (0.5 in)	36 years	20 of 100 (Routine)
30 June 1917	Kola-In-Murman, RU	monthly rain	24.6 mm (1.0 in)	3.0 mm (0.12 in)	2 years	20 of 100 (Routine)
30 June 1917	Clanwilliam (Pol), ZA	daily rain	7.6 mm (0.30 in)	4.6 mm (0.18 in)	35 years	20 of 100 (Routine)
30 June 1917	Chatham, CA	daily rain	23.6 mm (0.9 in)	3.8 mm (0.15 in)	42 years	20 of 100 (Routine)
30 June 1917	Point Escuminac, CA	daily rain	30.2 mm (1.2 in)	17.8 mm (0.7 in)	3 years	20 of 100 (Routine)
30 June 1917	St. Petersburg, RU	daily high max	31.6 C (88.9 F)	4.9 C (8.8 F)	20 years	19 of 100 (Routine)
30 June 1917	St. Petersburg, RU	monthly high min	20.2 C (68.4 F)	1.1 C (2.0 F)	7 years	18 of 100 (Routine)
30 June 1917	Caledon (Pol), ZA	daily rain	16.5 mm (0.6 in)	5.6 mm (0.22 in)	28 years	18 of 100 (Routine)
30 June 1917	Piketberg (Pol), ZA	daily rain	26.2 mm (1.0 in)	5.9 mm (0.23 in)	26 years	17 of 100 (Routine)
30 June 1917	Berlin-Dahlem, DE	monthly high min	23.0 C (73.4 F)	0.7 C (1.3 F)	0 years	16 of 100 (Routine)
30 June 1917	Stellenbosch (Tnk), ZA	daily rain	18.3 mm (0.7 in)	0.5 mm (0.02 in)	37 years	15 of 100 (Routine)
30 June 1917	Montgomery Wb City, US	daily low min	18.9 C (66.0 F)	0.5 C (0.9 F)	32 years	15 of 100 (Routine)
30 June 1917	Zagreb-Gric, HR	monthly high max	33.4 C (92.1 F)	0.4 C (0.7 F)	0 years	14 of 100 (Routine)
30 June 1917	Kremsmuenster, AT	daily high min	17.9 C (64.2 F)	0.6 C (1.1 F)	25 years	13 of 100 (Routine)
30 June 1917	Koebenhavn: Landbohojskolen-1, DK	daily high min	17.1 C (62.8 F)	0.7 C (1.3 F)	19 years	11 of 100 (Routine)
30 June 1917	Oudtshoorn, ZA	daily rain	4.1 mm (0.16 in)	0.8 mm (0.03 in)	24 years	11 of 100 (Routine)
30 June 1917	Dublin Phoenix Park, IE	daily low min	2.2 C (36.0 F)	0.7 C (1.3 F)	11 years	10 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

1826 to 1917

Records set or tied on this calendar date in each year from 1826 to 1917. 1917 had 39 records.

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

Records on 06-30 in each year
Year	Records
1826	1
1832	1
1835	2
1843	2
1846	1
1848	2
1849	1
1853	1
1855	1
1857	1
1860	1
1863	1
1865	1
1869	1
1871	1
1873	1
1876	1
1879	2
1882	2
1883	3
1885	4
1886	1
1887	2
1888	2
1889	1
1890	3
1891	2
1892	1
1894	1
1895	1
1896	2
1897	6
1898	3
1899	4
1900	5
1901	9
1902	10
1903	8
1904	20
1905	23
1906	20
1907	12
1908	17
1909	39
1910	57
1911	12
1912	32
1913	99
1914	97
1915	40
1916	66
1917	39
1918	54
1919	72
1920	319
1921	121
1922	133
1923	309
1924	194
1925	113
1926	65
1927	240
1928	137
1929	213
1930	168
1931	774
1932	154
1933	571
1934	331
1935	347
1936	620
1937	458
1938	330
1939	438
1940	346
1941	341
1942	408
1943	790
1944	272
1945	671
1946	631
1947	487
1948	340
1949	403
1950	494
1951	517
1952	533
1953	404
1954	426
1955	432
1956	409
1957	592
1958	423
1959	948
1960	270
1961	351
1962	375
1963	560
1964	434
1965	240
1966	379
1967	414
1968	752
1969	459
1970	730
1971	459
1972	558
1973	623
1974	643
1975	414
1976	607
1977	662
1978	721
1979	601
1980	935
1981	838
1982	1,230
1983	752
1984	722
1985	829
1986	745
1987	1,044
1988	1,216
1989	953
1990	1,191
1991	1,129
1992	1,670
1993	711
1994	951
1995	1,354
1996	889
1997	938
1998	1,714
1999	910
2000	861
2001	778
2002	904
2003	896
2004	998
2005	1,526
2006	723
2007	736
2008	852
2009	1,052
2010	1,069
2011	1,057
2012	1,416
2013	963
2014	496
2015	1,018
2016	371
2017	642
2018	625
2019	1,042
2020	1,151
2021	1,442
2022	709
2023	531
2024	1,004
2025	858
2026	999

Download the Data

Data for records on 1917-06-30: 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	25
5 to 10	2
10 to 15	2
15 to 20	1
20 to 25	0
25 to 30	2