Weather Records on 15 May 1917

80 weather records were set or tied worldwide on 15 May 1917. Highest significance: Bic, CA.

Key Facts for 15 May 1917

On 15 May 1917, 80 weather records were set or tied at long-record stations worldwide.
26 were record highs and 9 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 2 monthly and 78 daily.
Bic set a daily record snowfall of 17.8 cm (7.0 in) on 15 May 1917.
Across 162 earlier years (1820 to 2026) the same calendar date averaged 433 records.

Record Map

80 stations

80 station records on 15 May 1917 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 15 May 1917: highest significance records shown on the map
Station	Country	Type	Value	Significance
Bic	Canada	Record daily snowfall	17.8 cm (7.0 in)	48 of 100 (Notable)
Metten	Germany	Record daily precipitation	26.7 mm (1.1 in)	28 of 100 (Routine)
Port Arthur	Canada	Record high maximum temperature	27.8 C (82.0 F)	25 of 100 (Routine)
Jena Sternwarte	Germany	Record high minimum temperature	14.8 C (58.6 F)	25 of 100 (Routine)
Lichtentanne	Germany	Record daily precipitation	30.6 mm (1.2 in)	25 of 100 (Routine)
Talmalmo	Australia	Record daily precipitation	51.8 mm (2.0 in)	24 of 100 (Routine)
Crookwell Post Office	Australia	Record daily precipitation	31.8 mm (1.3 in)	23 of 100 (Routine)
Cap Madeleine	Canada	Record daily precipitation	21.6 mm (0.9 in)	20 of 100 (Routine)
Mortlake	Australia	Record daily precipitation	16.3 mm (0.6 in)	20 of 100 (Routine)
Beeac (Eurack)	Australia	Record daily precipitation	8.4 mm (0.33 in)	20 of 100 (Routine)
Pointe Au Pere	Canada	Record daily snowfall	1.5 cm (0.6 in)	19 of 100 (Routine)
Bad Muskau	Germany	Record daily precipitation	17.3 mm (0.7 in)	19 of 100 (Routine)
Portland	United States	Record low minimum temperature	1.7 C (35.1 F)	19 of 100 (Routine)
Hamilton	Australia	Record daily precipitation	16.3 mm (0.6 in)	18 of 100 (Routine)
Gunning Rural Supplies	Australia	Record daily precipitation	17.8 mm (0.7 in)	17 of 100 (Routine)
St Albans	Canada	Record high maximum temperature	32.8 C (91.0 F)	17 of 100 (Routine)
Bic	Canada	Record daily precipitation	17.8 mm (0.7 in)	17 of 100 (Routine)
Ringwood 2	Australia	Record daily precipitation	7.1 mm (0.28 in)	16 of 100 (Routine)
Northfield	United States	Record low maximum temperature	7.2 C (45.0 F)	16 of 100 (Routine)
Swift Current	Canada	Record high minimum temperature	14.4 C (57.9 F)	15 of 100 (Routine)
Port Arthur	Canada	Record high minimum temperature	8.3 C (46.9 F)	15 of 100 (Routine)
Milwaukee Wb City	United States	Record high minimum temperature	13.3 C (55.9 F)	15 of 100 (Routine)
Jacksonville Wb City	United States	Record low minimum temperature	11.1 C (52.0 F)	15 of 100 (Routine)
Port Fairy (Griffiths Island)	Australia	Record daily precipitation	8.4 mm (0.33 in)	14 of 100 (Routine)
Plauen	Germany	Record high minimum temperature	14.9 C (58.8 F)	14 of 100 (Routine)
Carcoar	Australia	Record daily precipitation	25.4 mm (1.0 in)	13 of 100 (Routine)
Walwa	Australia	Record daily precipitation	40.6 mm (1.6 in)	13 of 100 (Routine)
Prince Albert	Canada	Record high minimum temperature	13.3 C (55.9 F)	13 of 100 (Routine)
Lakefield	Canada	Record low minimum temperature	0.0 C (32.0 F)	13 of 100 (Routine)
Magdeburg	Germany	Record high minimum temperature	16.5 C (61.7 F)	13 of 100 (Routine)
Arnsberg	Germany	Record high minimum temperature	14.0 C (57.2 F)	13 of 100 (Routine)
Bethungra Park	Australia	Record daily precipitation	12.7 mm (0.5 in)	12 of 100 (Routine)
Jindera (Wadilock)	Australia	Record daily precipitation	25.9 mm (1.0 in)	12 of 100 (Routine)
Winchelsea (Murdeduke)	Australia	Record daily precipitation	6.4 mm (0.25 in)	12 of 100 (Routine)
Minnedosa	Canada	Record high maximum temperature	31.1 C (88.0 F)	12 of 100 (Routine)
Stony Mountain	Canada	Record high maximum temperature	30.0 C (86.0 F)	12 of 100 (Routine)
Karlsruhe	Germany	Record high minimum temperature	16.4 C (61.5 F)	12 of 100 (Routine)
Munchen-Nymphenburg	Germany	Record high minimum temperature	15.4 C (59.7 F)	12 of 100 (Routine)
Burlington	United States	Record low maximum temperature	7.2 C (45.0 F)	12 of 100 (Routine)
Escanaba	United States	Record high maximum temperature	25.6 C (78.1 F)	12 of 100 (Routine)
Yorketown	Australia	Record daily precipitation	10.2 mm (0.4 in)	11 of 100 (Routine)
Booligal (Ulonga)	Australia	Record daily precipitation	9.7 mm (0.38 in)	11 of 100 (Routine)
Litchfield	Australia	Record daily precipitation	5.8 mm (0.23 in)	11 of 100 (Routine)
Macarthur (Glenhuntly)	Australia	Record daily precipitation	12.4 mm (0.5 in)	11 of 100 (Routine)
Medicine Hat A	Canada	Record high minimum temperature	13.9 C (57.0 F)	11 of 100 (Routine)
Nurnberg	Germany	Record high minimum temperature	13.3 C (55.9 F)	11 of 100 (Routine)
Warracknabeal Post Office	Australia	Record daily precipitation	15.0 mm (0.6 in)	10 of 100 (Routine)
Qu'appelle	Canada	Record high minimum temperature	11.7 C (53.1 F)	10 of 100 (Routine)
Prince Albert	Canada	Record high maximum temperature	29.4 C (84.9 F)	10 of 100 (Routine)
Winnipeg St Johns Coll	Canada	Record high maximum temperature	30.6 C (87.1 F)	10 of 100 (Routine)
Greenville Dwtn AP	United States	Record low minimum temperature	3.3 C (37.9 F)	10 of 100 (Routine)
Goulburn (Kippilaw)	Australia	Record daily precipitation	14.0 mm (0.6 in)	9 of 100 (Routine)
Tumbarumba Post Office	Australia	Record daily precipitation	33.3 mm (1.3 in)	9 of 100 (Routine)
Morangarell	Australia	Record daily precipitation	11.4 mm (0.4 in)	9 of 100 (Routine)
Gobarralong	Australia	Record daily precipitation	14.0 mm (0.6 in)	9 of 100 (Routine)
Halls Gap	Australia	Record daily precipitation	25.4 mm (1.0 in)	9 of 100 (Routine)
Port Campbell Post Office	Australia	Record daily precipitation	15.0 mm (0.6 in)	9 of 100 (Routine)
Qu'appelle	Canada	Record high maximum temperature	30.0 C (86.0 F)	9 of 100 (Routine)
Medicine Hat A	Canada	Record high maximum temperature	32.8 C (91.0 F)	8 of 100 (Routine)
Tumut (Red Hill Station)	Australia	Record daily precipitation	35.1 mm (1.4 in)	7 of 100 (Routine)

Counts by Type and Timescale

80 records

Records set or tied on 15 May 1917 by type: Highest daily maximum 11, Lowest daily maximum 3, Highest daily minimum 15, Lowest daily minimum 6, Heaviest daily rainfall 43, Heaviest daily snowfall 2.

Records on 15 May 1917 by type
Record type	Records
Highest daily maximum	11
Lowest daily maximum	3
Highest daily minimum	15
Lowest daily minimum	6
Heaviest daily rainfall	43
Heaviest daily snowfall	2
Deepest snow cover	0

Records on 15 May 1917 by timescale: all-time 0, monthly 2, daily 78.

How Much Records Were Beaten By

75 broken records

Margins by which the 75 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 178.0. Ties are not counted.

Top 20 by Significance

15 May 1917

Top 20 records on 15 May 1917 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
15 May 1917	Bic, CA	daily snowfall	17.8 cm (7.0 in)	17.8 cm (7.0 in)	33 years	48 of 100 (Notable)
15 May 1917	Metten, DE	daily rain	26.7 mm (1.1 in)	11.0 mm (0.4 in)	21 years	28 of 100 (Routine)
15 May 1917	Port Arthur, CA	daily high max	27.8 C (82.0 F)	6.1 C (11.0 F)	35 years	25 of 100 (Routine)
15 May 1917	Jena Sternwarte, DE	daily high min	14.8 C (58.6 F)	0.3 C (0.5 F)	54 years	25 of 100 (Routine)
15 May 1917	Lichtentanne, DE	daily rain	30.6 mm (1.2 in)	10.6 mm (0.4 in)	19 years	25 of 100 (Routine)
15 May 1917	Talmalmo, AU	monthly rain	51.8 mm (2.0 in)	3.0 mm (0.12 in)	28 years	24 of 100 (Routine)
15 May 1917	Crookwell Post Office, AU	daily rain	31.8 mm (1.3 in)	14.3 mm (0.6 in)	2 years	23 of 100 (Routine)
15 May 1917	Cap Madeleine, CA	daily rain	21.6 mm (0.9 in)	7.9 mm (0.31 in)	27 years	20 of 100 (Routine)
15 May 1917	Mortlake, AU	daily rain	16.3 mm (0.6 in)	7.9 mm (0.31 in)	8 years	20 of 100 (Routine)
15 May 1917	Beeac (Eurack), AU	daily rain	8.4 mm (0.33 in)	4.6 mm (0.18 in)	31 years	20 of 100 (Routine)
15 May 1917	Pointe Au Pere, CA	daily snowfall	1.5 cm (0.6 in)	1.5 cm (0.6 in)	42 years	19 of 100 (Routine)
15 May 1917	Bad Muskau, DE	daily rain	17.3 mm (0.7 in)	9.7 mm (0.38 in)	4 years	19 of 100 (Routine)
15 May 1917	Portland, US	daily low min	1.7 C (35.1 F)	1.6 C (2.9 F)	34 years	19 of 100 (Routine)
15 May 1917	Hamilton, AU	daily rain	16.3 mm (0.6 in)	6.4 mm (0.25 in)	8 years	18 of 100 (Routine)
15 May 1917	Gunning Rural Supplies, AU	daily rain	17.8 mm (0.7 in)	7.6 mm (0.30 in)	23 years	17 of 100 (Routine)
15 May 1917	St Albans, CA	daily high max	32.8 C (91.0 F)	3.9 C (7.0 F)	31 years	17 of 100 (Routine)
15 May 1917	Bic, CA	daily rain	17.8 mm (0.7 in)	5.1 mm (0.20 in)	28 years	17 of 100 (Routine)
15 May 1917	Ringwood 2, AU	daily rain	7.1 mm (0.28 in)	0.2 mm (0.01 in)	41 years	16 of 100 (Routine)
15 May 1917	Northfield, US	daily low max	7.2 C (45.0 F)	3.4 C (6.1 F)	28 years	16 of 100 (Routine)
15 May 1917	Swift Current, CA	daily high min	14.4 C (57.9 F)	3.8 C (6.8 F)	16 years	15 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

1820 to 1917

Records set or tied on this calendar date in each year from 1820 to 1917. 1917 had 80 records.

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

Records on 05-15 in each year
Year	Records
1820	1
1825	1
1831	1
1832	1
1837	2
1845	1
1847	2
1848	1
1855	2
1857	2
1859	1
1862	1
1863	1
1865	1
1866	2
1867	1
1868	2
1870	1
1871	3
1874	2
1876	4
1878	1
1879	2
1881	1
1883	1
1885	1
1886	2
1888	3
1891	3
1893	5
1894	2
1895	4
1896	2
1897	4
1898	3
1899	9
1900	9
1901	2
1902	9
1903	4
1904	13
1905	16
1906	10
1907	27
1908	25
1909	89
1910	27
1911	27
1912	26
1913	60
1914	16
1915	236
1916	27
1917	80
1918	133
1919	25
1920	58
1921	92
1922	30
1923	125
1924	174
1925	100
1926	161
1927	191
1928	144
1929	161
1930	136
1931	459
1932	368
1933	439
1934	227
1935	288
1936	372
1937	373
1938	393
1939	351
1940	179
1941	454
1942	701
1943	568
1944	630
1945	588
1946	238
1947	334
1948	264
1949	363
1950	260
1951	736
1952	476
1953	426
1954	355
1955	538
1956	466
1957	521
1958	605
1959	764
1960	291
1961	508
1962	1,128
1963	782
1964	347
1965	320
1966	389
1967	609
1968	1,019
1969	790
1970	512
1971	351
1972	484
1973	818
1974	1,230
1975	372
1976	803
1977	1,186
1978	922
1979	404
1980	625
1981	586
1982	500
1983	1,215
1984	1,059
1985	649
1986	679
1987	1,073
1988	643
1989	552
1990	776
1991	1,179
1992	944
1993	784
1994	910
1995	1,750
1996	1,452
1997	1,175
1998	1,641
1999	810
2000	850
2001	1,280
2002	801
2003	1,023
2004	1,046
2005	767
2006	955
2007	949
2008	995
2009	675
2010	1,088
2011	1,298
2012	751
2013	1,081
2014	1,411
2015	717
2016	890
2017	435
2018	1,074
2019	627
2020	472
2021	412
2022	847
2023	566
2024	596
2025	801
2026	481

Download the Data

Data for records on 1917-05-15: 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 25	74
25 to 50	0
50 to 75	0
75 to 100	0
100 to 125	0
125 to 150	0
150 to 175	0
175 to 200	1