Weather Records on 15 September 2017

825 weather records were set or tied worldwide on 15 September 2017. Highest significance: Broadus, US.

Key Facts for 15 September 2017

On 15 September 2017, 825 weather records were set or tied at long-record stations worldwide.
316 were record highs and 181 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 19 monthly and 805 daily.
Broadus set a monthly record daily precipitation of 76.2 mm (3.0 in) on 15 September 2017.
Across 170 earlier years (1797 to 2026) the same calendar date averaged 410 records.

Record Map

825 stations

825 station records on 15 September 2017 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 15 September 2017: highest significance records shown on the map
Station	Country	Type	Value	Significance
Broadus	United States	Record daily precipitation	76.2 mm (3.0 in)	81 of 100 (Exceptional)
Uhta	Russia	Record daily precipitation	62.0 mm (2.4 in)	69 of 100 (Major)
Howe	United States	Record daily precipitation	27.9 mm (1.1 in)	63 of 100 (Major)
Idaho Falls 46 W	United States	Record daily precipitation	30.0 mm (1.2 in)	63 of 100 (Major)
Big Timber	United States	Record daily precipitation	39.4 mm (1.6 in)	62 of 100 (Major)
Aberporth	United Kingdom	Record daily precipitation	40.0 mm (1.6 in)	60 of 100 (Major)
Albion 1 N	United States	Record daily precipitation	55.9 mm (2.2 in)	60 of 100 (Major)
Holter Dam	United States	Record daily precipitation	27.4 mm (1.1 in)	59 of 100 (Notable)
Dillon AP	United States	Record daily precipitation	26.2 mm (1.0 in)	59 of 100 (Notable)
Cascade 5 S	United States	Record daily precipitation	47.0 mm (1.9 in)	58 of 100 (Notable)
Sun Rvr 4 S	United States	Record daily precipitation	25.1 mm (1.0 in)	57 of 100 (Notable)
Emblem	United States	Record daily precipitation	34.5 mm (1.4 in)	57 of 100 (Notable)
Lakeview	United States	Record daily precipitation	41.1 mm (1.6 in)	56 of 100 (Notable)
Moccasin Exp STN	United States	Record daily precipitation	29.0 mm (1.1 in)	56 of 100 (Notable)
Arcadia	United States	Record daily precipitation	74.9 mm (2.9 in)	55 of 100 (Notable)
Viljandi	Estonia	Record daily precipitation	28.9 mm (1.1 in)	53 of 100 (Notable)
Grass Range	United States	Record daily precipitation	46.5 mm (1.8 in)	53 of 100 (Notable)
Melville 4 W	United States	Record daily precipitation	39.9 mm (1.6 in)	53 of 100 (Notable)
Mackay Lost Rvr Rs	United States	Record low maximum temperature	4.4 C (39.9 F)	52 of 100 (Notable)
Conrad	United States	Record daily precipitation	25.4 mm (1.0 in)	52 of 100 (Notable)
Chilly Barton Flat	United States	Record daily precipitation	29.0 mm (1.1 in)	51 of 100 (Notable)
Alpine	United States	Record daily precipitation	32.3 mm (1.3 in)	51 of 100 (Notable)
Tetonia Exp STN	United States	Record daily precipitation	32.5 mm (1.3 in)	49 of 100 (Notable)
Dillon U of Montana Western	United States	Record daily precipitation	36.6 mm (1.4 in)	48 of 100 (Notable)
Lennep 5 SW	United States	Record daily precipitation	27.9 mm (1.1 in)	48 of 100 (Notable)
Cody	United States	Record daily precipitation	28.7 mm (1.1 in)	48 of 100 (Notable)
Sernovodsk	Russia	Record daily precipitation	25.6 mm (1.0 in)	47 of 100 (Notable)
Waikiki 717.2	United States	Record low minimum temperature	13.3 C (55.9 F)	47 of 100 (Notable)
Irael	Russia	Record daily precipitation	36.5 mm (1.4 in)	46 of 100 (Notable)
Moorhead 9 NE	United States	Record daily precipitation	46.2 mm (1.8 in)	46 of 100 (Notable)
Rapelje	United States	Record daily precipitation	32.0 mm (1.3 in)	46 of 100 (Notable)
Cottonwood Weir	United States	Record daily precipitation	27.2 mm (1.1 in)	46 of 100 (Notable)
Camp Crook	United States	Record daily precipitation	42.9 mm (1.7 in)	45 of 100 (Notable)
Burris	United States	Record daily precipitation	31.8 mm (1.3 in)	45 of 100 (Notable)
Thermopolis	United States	Record daily precipitation	25.4 mm (1.0 in)	45 of 100 (Notable)
Boulder Mountain	United States	Record daily precipitation	38.1 mm (1.5 in)	45 of 100 (Notable)
Caledonia	United States	Record high maximum temperature	30.6 C (87.1 F)	44 of 100 (Notable)
Billings Intl AP	United States	Record daily precipitation	31.0 mm (1.2 in)	44 of 100 (Notable)
San Carlos Rsvr	United States	Record high minimum temperature	25.6 C (78.1 F)	43 of 100 (Notable)
Great Falls 16St	United States	Record daily precipitation	29.5 mm (1.2 in)	43 of 100 (Notable)
Dickinson Theodore Roosevelt R	United States	Record daily precipitation	42.4 mm (1.7 in)	43 of 100 (Notable)
Roberts 1 W	United States	Record daily precipitation	48.8 mm (1.9 in)	42 of 100 (Notable)
Springdale	United States	Record daily precipitation	30.5 mm (1.2 in)	42 of 100 (Notable)
Elizabethton	United States	Record low maximum temperature	20.0 C (68.0 F)	42 of 100 (Notable)
Midland Odessa	United States	Record high minimum temperature	25.0 C (77.0 F)	42 of 100 (Notable)
Spirit Lake	United States	Record high maximum temperature	30.6 C (87.1 F)	41 of 100 (Notable)
Norris Madison Pwr House	United States	Record daily precipitation	43.2 mm (1.7 in)	41 of 100 (Notable)
Adel	United States	Record low maximum temperature	4.4 C (39.9 F)	40 of 100 (Notable)
Ekalaka	United States	Record daily precipitation	51.8 mm (2.0 in)	40 of 100 (Notable)
Fishtail	United States	Record daily precipitation	30.7 mm (1.2 in)	40 of 100 (Notable)
Harlowton	United States	Record daily precipitation	39.6 mm (1.6 in)	40 of 100 (Notable)
Carrizo Springs 3S	United States	Record high maximum temperature	41.1 C (106.0 F)	40 of 100 (Notable)
Dubois	United States	Record daily precipitation	25.7 mm (1.0 in)	40 of 100 (Notable)
Qaqortoq	Greenland [Denmark]	Record daily precipitation	91.1 mm (3.6 in)	39 of 100 (Notable)
Brusett 3 E	United States	Record daily precipitation	35.6 mm (1.4 in)	39 of 100 (Notable)
Stanford	United States	Record daily precipitation	35.6 mm (1.4 in)	39 of 100 (Notable)
Trident	United States	Record daily precipitation	32.3 mm (1.3 in)	39 of 100 (Notable)
Hilts Creek	United States	Record daily precipitation	27.9 mm (1.1 in)	39 of 100 (Notable)
Grand Forks Intl AP	United States	Record daily precipitation	49.8 mm (2.0 in)	39 of 100 (Notable)
Phuket	Thailand	Record daily precipitation	149.1 mm (5.9 in)	38 of 100 (Notable)

Counts by Type and Timescale

825 records

Records set or tied on 15 September 2017 by type: Highest daily maximum 181, Lowest daily maximum 137, Highest daily minimum 135, Lowest daily minimum 44, Heaviest daily rainfall 320, Heaviest daily snowfall 7, Deepest snow cover 1.

Records on 15 September 2017 by type
Record type	Records
Highest daily maximum	181
Lowest daily maximum	137
Highest daily minimum	135
Lowest daily minimum	44
Heaviest daily rainfall	320
Heaviest daily snowfall	7
Deepest snow cover	1

Records on 15 September 2017 by timescale: all-time 1, monthly 19, daily 805.

How Much Records Were Beaten By

679 broken records

Margins by which the 679 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 77.0. Ties are not counted.

Top 20 by Significance

15 September 2017

Top 20 records on 15 September 2017 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
15 September 2017	Broadus, US	monthly rain	76.2 mm (3.0 in)	21.6 mm (0.9 in)	93 years	81 of 100 (Exceptional)
15 September 2017	Uhta, RU	monthly rain	62.0 mm (2.4 in)	21.5 mm (0.8 in)	41 years	69 of 100 (Major)
15 September 2017	Howe, US	daily rain	27.9 mm (1.1 in)	19.5 mm (0.8 in)	67 years	63 of 100 (Major)
15 September 2017	Idaho Falls 46 W, US	daily rain	30.0 mm (1.2 in)	22.1 mm (0.9 in)	58 years	63 of 100 (Major)
15 September 2017	Big Timber, US	daily rain	39.4 mm (1.6 in)	22.6 mm (0.9 in)	67 years	62 of 100 (Major)
15 September 2017	Aberporth, GB	daily rain	40.0 mm (1.6 in)	24.8 mm (1.0 in)	52 years	60 of 100 (Major)
15 September 2017	Albion 1 N, US	monthly rain	55.9 mm (2.2 in)	22.4 mm (0.9 in)	14 years	60 of 100 (Major)
15 September 2017	Holter Dam, US	daily rain	27.4 mm (1.1 in)	15.7 mm (0.6 in)	88 years	59 of 100 (Notable)
15 September 2017	Dillon AP, US	daily rain	26.2 mm (1.0 in)	19.1 mm (0.8 in)	51 years	59 of 100 (Notable)
15 September 2017	Cascade 5 S, US	daily rain	47.0 mm (1.9 in)	21.6 mm (0.9 in)	70 years	58 of 100 (Notable)
15 September 2017	Sun Rvr 4 S, US	daily rain	25.1 mm (1.0 in)	19.0 mm (0.7 in)	54 years	57 of 100 (Notable)
15 September 2017	Emblem, US	daily rain	34.5 mm (1.4 in)	26.9 mm (1.1 in)	26 years	57 of 100 (Notable)
15 September 2017	Lakeview, US	daily rain	41.1 mm (1.6 in)	24.6 mm (1.0 in)	51 years	56 of 100 (Notable)
15 September 2017	Moccasin Exp STN, US	daily rain	29.0 mm (1.1 in)	14.3 mm (0.6 in)	72 years	56 of 100 (Notable)
15 September 2017	Arcadia, US	daily rain	74.9 mm (2.9 in)	38.1 mm (1.5 in)	87 years	55 of 100 (Notable)
15 September 2017	Viljandi, EE	daily rain	28.9 mm (1.1 in)	13.6 mm (0.5 in)	60 years	53 of 100 (Notable)
15 September 2017	Grass Range, US	daily rain	46.5 mm (1.8 in)	30.8 mm (1.2 in)	11 years	53 of 100 (Notable)
15 September 2017	Melville 4 W, US	daily rain	39.9 mm (1.6 in)	21.6 mm (0.9 in)	52 years	53 of 100 (Notable)
15 September 2017	Mackay Lost Rvr Rs, US	daily low max	4.4 C (39.9 F)	6.2 C (11.2 F)	103 years	52 of 100 (Notable)
15 September 2017	Conrad, US	daily rain	25.4 mm (1.0 in)	17.8 mm (0.7 in)	52 years	52 of 100 (Notable)

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

1797 to 2017

Records set or tied on this calendar date in each year from 1797 to 2017. 2017 had 825 records.

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

Records on 09-15 in each year
Year	Records
1797	1
1803	1
1806	2
1810	1
1816	1
1818	1
1823	2
1833	1
1836	1
1837	2
1839	1
1841	1
1848	1
1850	1
1851	1
1854	2
1856	1
1857	1
1859	1
1864	1
1865	2
1866	1
1867	2
1868	1
1869	1
1872	1
1873	2
1876	2
1877	2
1880	1
1881	1
1882	6
1884	3
1885	4
1886	2
1887	3
1888	1
1889	5
1890	1
1894	4
1895	1
1897	1
1898	3
1899	3
1900	1
1901	12
1902	7
1903	31
1904	30
1905	16
1906	6
1907	7
1908	16
1909	16
1910	2
1911	40
1912	64
1913	43
1914	18
1915	94
1916	44
1917	50
1918	50
1919	52
1920	164
1921	122
1922	53
1923	193
1924	103
1925	112
1926	134
1927	539
1928	86
1929	99
1930	235
1931	422
1932	295
1933	322
1934	351
1935	463
1936	460
1937	337
1938	247
1939	1,098
1940	181
1941	276
1942	278
1943	360
1944	396
1945	418
1946	411
1947	621
1948	557
1949	523
1950	750
1951	283
1952	455
1953	400
1954	518
1955	532
1956	646
1957	449
1958	294
1959	844
1960	410
1961	586
1962	557
1963	455
1964	839
1965	614
1966	534
1967	578
1968	429
1969	362
1970	1,157
1971	598
1972	356
1973	774
1974	386
1975	739
1976	667
1977	400
1978	628
1979	1,022
1980	563
1981	613
1982	1,315
1983	756
1984	766
1985	764
1986	928
1987	719
1988	818
1989	955
1990	911
1991	1,165
1992	919
1993	2,227
1994	1,363
1995	723
1996	1,212
1997	1,177
1998	1,768
1999	858
2000	1,175
2001	837
2002	1,212
2003	855
2004	893
2005	1,123
2006	1,042
2007	946
2008	1,153
2009	773
2010	913
2011	1,170
2012	568
2013	854
2014	443
2015	997
2016	988
2017	825
2018	874
2019	538
2020	785
2021	467
2022	392
2023	507
2024	681
2025	503
2026	779

Download the Data

Data for records on 2017-09-15: 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 2026-10-16. Last revised 16 October 2026 (2026-10-16).

Margin	Records
0 to 10	564
10 to 20	85
20 to 30	21
30 to 40	6
40 to 50	2
50 to 60	0
60 to 70	0
70 to 80	1