Weather Records on 20 September 2017

920 weather records were set or tied worldwide on 20 September 2017. Highest significance: Irvinebank, AU.

Key Facts for 20 September 2017

On 20 September 2017, 920 weather records were set or tied at long-record stations worldwide.
405 were record highs and 215 were record lows, counting maximum and minimum temperature.
By timescale, 3 were all-time records, 12 monthly and 905 daily.
Irvinebank set a daily record precipitation of 37.6 mm (1.5 in) on 20 September 2017.
Across 156 earlier years (1812 to 2026) the same calendar date averaged 439 records.

Record Map

920 stations

920 station records on 20 September 2017 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 September 2017: highest significance records shown on the map
Station	Country	Type	Value	Significance
Irvinebank	Australia	Record daily precipitation	37.6 mm (1.5 in)	76 of 100 (Major)
Coloso	Puerto Rico [United States]	Record daily precipitation	254.0 mm (10.0 in)	76 of 100 (Major)
Detroit Lakes 1 NNE	United States	Record daily precipitation	62.5 mm (2.5 in)	75 of 100 (Major)
Fond du Lac Wwtp	United States	Record daily precipitation	100.3 mm (3.9 in)	71 of 100 (Major)
Morovis 1 N	Puerto Rico [United States]	Record daily precipitation	622.8 mm (24.5 in)	70 of 100 (Major)
Petford	Australia	Record daily precipitation	28.2 mm (1.1 in)	64 of 100 (Major)
Mahabaleshwar	India	Record daily precipitation	247.9 mm (9.8 in)	63 of 100 (Major)
Debrecen Airport	Hungary	Record daily precipitation	32.6 mm (1.3 in)	62 of 100 (Major)
Bombay/Santacruz	India	Record daily precipitation	304.0 mm (12.0 in)	62 of 100 (Major)
Halstad	United States	Record daily precipitation	140.7 mm (5.5 in)	62 of 100 (Major)
San Juan L M Marin Intl AP	Puerto Rico [United States]	Record daily precipitation	180.6 mm (7.1 in)	61 of 100 (Major)
Rock Is L&D 15	United States	Record daily precipitation	63.2 mm (2.5 in)	59 of 100 (Notable)
Belknap Springs 8 N	United States	Record daily precipitation	68.6 mm (2.7 in)	58 of 100 (Notable)
Ada	United States	Record daily precipitation	100.6 mm (4.0 in)	57 of 100 (Notable)
Red Lake Indian Agcy	United States	Record daily precipitation	30.7 mm (1.2 in)	57 of 100 (Notable)
Guayama 1SW	Puerto Rico [United States]	Record daily precipitation	249.7 mm (9.8 in)	56 of 100 (Notable)
Paraiso	Puerto Rico [United States]	Record daily precipitation	203.2 mm (8.0 in)	55 of 100 (Notable)
Visby_Flygplats	Sweden	Record daily precipitation	30.7 mm (1.2 in)	53 of 100 (Notable)
Red Lake Falls	United States	Record daily precipitation	63.0 mm (2.5 in)	53 of 100 (Notable)
Jajome Alto	Puerto Rico [United States]	Record daily precipitation	219.5 mm (8.6 in)	52 of 100 (Notable)
Dismal Swamp	United States	Record daily precipitation	35.6 mm (1.4 in)	51 of 100 (Notable)
Casselton Agronomy Farm	United States	Record daily precipitation	61.0 mm (2.4 in)	50 of 100 (Notable)
Edgeley 3WNW	United States	Record daily precipitation	54.6 mm (2.1 in)	50 of 100 (Notable)
Litchville 2NW	United States	Record daily precipitation	128.8 mm (5.1 in)	49 of 100 (Notable)
Babinda Post Office	Australia	Record daily precipitation	67.0 mm (2.6 in)	47 of 100 (Notable)
Jingdezhen	China	Record daily precipitation	49.0 mm (1.9 in)	47 of 100 (Notable)
Mckenzie	United States	Record daily precipitation	68.6 mm (2.7 in)	46 of 100 (Notable)
Muskegon Co AP	United States	Record high maximum temperature	32.2 C (90.0 F)	46 of 100 (Notable)
Mulgrave Mill	Australia	Record daily precipitation	25.0 mm (1.0 in)	45 of 100 (Notable)
Santiam Junction	United States	Record daily precipitation	25.7 mm (1.0 in)	45 of 100 (Notable)
Riggins	United States	Record low maximum temperature	12.8 C (55.0 F)	44 of 100 (Notable)
Wiad	Sweden	Record daily precipitation	25.2 mm (1.0 in)	43 of 100 (Notable)
Estacada 2 SE	United States	Record daily precipitation	51.1 mm (2.0 in)	43 of 100 (Notable)
Goldendale	United States	Record low maximum temperature	14.4 C (57.9 F)	43 of 100 (Notable)
Abjorsbraten	Norway	Record daily precipitation	27.0 mm (1.1 in)	42 of 100 (Notable)
Charleston	United States	Record high maximum temperature	35.0 C (95.0 F)	42 of 100 (Notable)
Geneseo	United States	Record high maximum temperature	33.9 C (93.0 F)	42 of 100 (Notable)
Rock Is L&D 15	United States	Record high maximum temperature	33.9 C (93.0 F)	42 of 100 (Notable)
Itasca UNIV of Minn	United States	Record daily precipitation	39.9 mm (1.6 in)	42 of 100 (Notable)
High Ridge	United States	Record daily precipitation	43.2 mm (1.7 in)	42 of 100 (Notable)
Marion Forks	United States	Record daily precipitation	53.3 mm (2.1 in)	42 of 100 (Notable)
Upper Barron	Australia	Record daily precipitation	26.8 mm (1.1 in)	41 of 100 (Notable)
Cannelton	United States	Record daily precipitation	71.6 mm (2.8 in)	41 of 100 (Notable)
Georgetown 1 E	United States	Record daily precipitation	53.6 mm (2.1 in)	41 of 100 (Notable)
Leech Lake	United States	Record daily precipitation	30.0 mm (1.2 in)	41 of 100 (Notable)
W Pt	United States	Record high minimum temperature	20.0 C (68.0 F)	41 of 100 (Notable)
Headworks Portland Wtr B	United States	Record low maximum temperature	12.2 C (54.0 F)	41 of 100 (Notable)
Jump Off Joe	United States	Record daily precipitation	45.7 mm (1.8 in)	41 of 100 (Notable)
Salem AP (McNary Field)	United States	Record low maximum temperature	15.0 C (59.0 F)	41 of 100 (Notable)
Greenhaven	Australia	Record daily precipitation	45.0 mm (1.8 in)	40 of 100 (Notable)
Bingil Bay	Australia	Record daily precipitation	79.4 mm (3.1 in)	40 of 100 (Notable)
Podor	Senegal	Record high maximum temperature	43.1 C (109.6 F)	40 of 100 (Notable)
Charlotteburg Rsvr	United States	Record high minimum temperature	18.3 C (64.9 F)	40 of 100 (Notable)
De Smet	United States	Record daily precipitation	33.0 mm (1.3 in)	40 of 100 (Notable)
Haines AP	United States	Record high maximum temperature	19.4 C (66.9 F)	40 of 100 (Notable)
Astrakan	Russia	Record high minimum temperature	17.5 C (63.5 F)	39 of 100 (Notable)
Oregon City	United States	Record daily precipitation	41.7 mm (1.6 in)	39 of 100 (Notable)
Longview	United States	Record daily precipitation	34.5 mm (1.4 in)	39 of 100 (Notable)
Aurland	Norway	Record daily precipitation	36.5 mm (1.4 in)	38 of 100 (Notable)
Plainville 4WNW	United States	Record high maximum temperature	38.9 C (102.0 F)	38 of 100 (Notable)

Counts by Type and Timescale

920 records

Records set or tied on 20 September 2017 by type: Highest daily maximum 148, Lowest daily maximum 166, Highest daily minimum 257, Lowest daily minimum 49, Heaviest daily rainfall 287, Heaviest daily snowfall 6, Deepest snow cover 7.

Records on 20 September 2017 by type
Record type	Records
Highest daily maximum	148
Lowest daily maximum	166
Highest daily minimum	257
Lowest daily minimum	49
Heaviest daily rainfall	287
Heaviest daily snowfall	6
Deepest snow cover	7

Records on 20 September 2017 by timescale: all-time 3, monthly 12, daily 905.

How Much Records Were Beaten By

724 broken records

Margins by which the 724 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 383.5. Ties are not counted.

Top 20 by Significance

20 September 2017

Top 20 records on 20 September 2017 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 September 2017	Irvinebank, AU	daily rain	37.6 mm (1.5 in)	27.4 mm (1.1 in)	126 years	76 of 100 (Major)
20 September 2017	Coloso, PR	all-time rain	254.0 mm (10.0 in)	39.4 mm (1.6 in)	84 years	76 of 100 (Major)
20 September 2017	Detroit Lakes 1 NNE, US	daily rain	62.5 mm (2.5 in)	37.1 mm (1.5 in)	104 years	75 of 100 (Major)
20 September 2017	Fond du Lac Wwtp, US	daily rain	100.3 mm (3.9 in)	70.8 mm (2.8 in)	72 years	71 of 100 (Major)
20 September 2017	Morovis 1 N, PR	all-time rain	622.8 mm (24.5 in)	383.5 mm (15.1 in)	15 years	70 of 100 (Major)
20 September 2017	Petford, AU	daily rain	28.2 mm (1.1 in)	28.2 mm (1.1 in)	96 years	64 of 100 (Major)
20 September 2017	Mahabaleshwar, IN	daily rain	247.9 mm (9.8 in)	106.4 mm (4.2 in)	76 years	63 of 100 (Major)
20 September 2017	Debrecen Airport, HU	daily rain	32.6 mm (1.3 in)	14.2 mm (0.6 in)	111 years	62 of 100 (Major)
20 September 2017	Bombay/Santacruz, IN	daily rain	304.0 mm (12.0 in)	206.2 mm (8.1 in)	55 years	62 of 100 (Major)
20 September 2017	Halstad, US	daily rain	140.7 mm (5.5 in)	105.1 mm (4.1 in)	56 years	62 of 100 (Major)
20 September 2017	San Juan L M Marin Intl AP, PR	daily rain	180.6 mm (7.1 in)	132.3 mm (5.2 in)	50 years	61 of 100 (Major)
20 September 2017	Rock Is L&D 15, US	daily rain	63.2 mm (2.5 in)	27.6 mm (1.1 in)	149 years	59 of 100 (Notable)
20 September 2017	Belknap Springs 8 N, US	daily rain	68.6 mm (2.7 in)	42.7 mm (1.7 in)	44 years	58 of 100 (Notable)
20 September 2017	Ada, US	monthly rain	100.6 mm (4.0 in)	24.9 mm (1.0 in)	43 years	57 of 100 (Notable)
20 September 2017	Red Lake Indian Agcy, US	daily rain	30.7 mm (1.2 in)	16.5 mm (0.6 in)	108 years	57 of 100 (Notable)
20 September 2017	Guayama 1SW, PR	daily rain	249.7 mm (9.8 in)	200.9 mm (7.9 in)	23 years	56 of 100 (Notable)
20 September 2017	Paraiso, PR	daily rain	203.2 mm (8.0 in)	129.5 mm (5.1 in)	32 years	55 of 100 (Notable)
20 September 2017	Visby_Flygplats, SE	daily rain	30.7 mm (1.2 in)	9.5 mm (0.37 in)	88 years	53 of 100 (Notable)
20 September 2017	Red Lake Falls, US	daily rain	63.0 mm (2.5 in)	48.8 mm (1.9 in)	10 years	53 of 100 (Notable)
20 September 2017	Jajome Alto, PR	daily rain	219.5 mm (8.6 in)	156.0 mm (6.1 in)	23 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

1812 to 2017

Records set or tied on this calendar date in each year from 1812 to 2017. 2017 had 920 records.

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

Records on 09-20 in each year
Year	Records
1812	1
1837	1
1840	1
1844	1
1848	2
1851	1
1852	1
1854	2
1855	1
1856	2
1859	2
1860	1
1862	1
1870	1
1871	2
1882	2
1883	1
1884	1
1886	2
1887	1
1888	2
1889	8
1891	4
1893	5
1894	1
1895	2
1896	1
1897	16
1898	4
1899	1
1900	2
1901	3
1902	3
1903	3
1904	12
1905	8
1906	22
1907	11
1908	24
1909	10
1910	8
1911	21
1912	34
1913	48
1914	28
1915	239
1916	28
1917	100
1918	59
1919	55
1920	64
1921	40
1922	52
1923	249
1924	329
1925	330
1926	129
1927	169
1928	144
1929	373
1930	102
1931	564
1932	270
1933	223
1934	349
1935	201
1936	133
1937	385
1938	506
1939	312
1940	591
1941	582
1942	436
1943	419
1944	466
1945	406
1946	766
1947	460
1948	454
1949	268
1950	435
1951	267
1952	434
1953	479
1954	628
1955	625
1956	985
1957	514
1958	410
1959	489
1960	352
1961	384
1962	707
1963	290
1964	482
1965	1,180
1966	414
1967	449
1968	617
1969	604
1970	591
1971	884
1972	582
1973	569
1974	771
1975	527
1976	375
1977	776
1978	1,216
1979	767
1980	567
1981	979
1982	911
1983	1,958
1984	895
1985	730
1986	743
1987	856
1988	698
1989	968
1990	743
1991	1,835
1992	718
1993	1,031
1994	788
1995	1,374
1996	1,077
1997	1,282
1998	1,157
1999	923
2000	908
2001	821
2002	845
2003	910
2004	1,156
2005	960
2006	732
2007	645
2008	648
2009	715
2010	1,497
2011	650
2012	549
2013	595
2014	577
2015	439
2016	778
2017	920
2018	1,020
2019	835
2020	630
2021	565
2022	786
2023	482
2024	596
2025	877
2026	682

Download the Data

Data for records on 2017-09-20: 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 50	712
50 to 100	3
100 to 150	5
150 to 200	1
200 to 250	2
250 to 300	0
300 to 350	0
350 to 400	1