Weather Records on 17 September 1971

898 weather records were set or tied worldwide on 17 September 1971. Highest significance: Ft Collins, US.

Key Facts for 17 September 1971

On 17 September 1971, 898 weather records were set or tied at long-record stations worldwide.
139 were record highs and 338 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 42 monthly and 855 daily.
Ft Collins set a monthly record daily snowfall of 33.0 cm (13.0 in) on 17 September 1971.
Across 164 earlier years (1796 to 2026) the same calendar date averaged 420 records.

Record Map

898 stations

898 station records on 17 September 1971 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 September 1971: highest significance records shown on the map
Station	Country	Type	Value	Significance
Ft Collins	United States	Record daily snowfall	33.0 cm (13.0 in)	79 of 100 (Major)
Byers 5 ENE	United States	Record daily snowfall	30.5 cm (12.0 in)	69 of 100 (Major)
Bailey	United States	Record daily snowfall	23.6 cm (9.3 in)	67 of 100 (Major)
Cheesman	United States	Record daily snowfall	25.4 cm (10.0 in)	67 of 100 (Major)
Longmont 2 ESE	United States	Record daily precipitation	39.4 mm (1.6 in)	67 of 100 (Major)
Ft Lupton 2 SE	United States	Record daily snowfall	30.5 cm (12.0 in)	66 of 100 (Major)
Canton 4N	United States	Record daily precipitation	82.6 mm (3.3 in)	64 of 100 (Major)
Westcliffe	United States	Record daily snowfall	17.8 cm (7.0 in)	63 of 100 (Major)
Aspen	United States	Record daily snowfall	17.3 cm (6.8 in)	62 of 100 (Major)
Chiricahua Nm	United States	Record daily precipitation	35.8 mm (1.4 in)	61 of 100 (Major)
Rush 1N	United States	Record daily snowfall	20.3 cm (8.0 in)	61 of 100 (Major)
Boulder	United States	Record daily precipitation	41.7 mm (1.6 in)	59 of 100 (Notable)
Longmont 2 ESE	United States	Record daily snowfall	15.2 cm (6.0 in)	59 of 100 (Notable)
Parker 6 E	United States	Record daily precipitation	47.0 mm (1.9 in)	59 of 100 (Notable)
Denver WSO City	United States	Record daily snowfall	22.9 cm (9.0 in)	59 of 100 (Notable)
Boulder	United States	Record daily snowfall	45.7 cm (18.0 in)	58 of 100 (Notable)
Red Rvr	United States	Record daily snowfall	30.5 cm (12.0 in)	56 of 100 (Notable)
Taos	United States	Record daily precipitation	33.0 mm (1.3 in)	56 of 100 (Notable)
Harwood Island (Harwood Sugar	Australia	Record daily precipitation	72.6 mm (2.9 in)	51 of 100 (Notable)
Castle Rock	United States	Record daily snowfall	26.7 cm (10.5 in)	51 of 100 (Notable)
N Bend SW Oregon Rgnl AP	United States	Record high minimum temperature	17.8 C (64.0 F)	50 of 100 (Notable)
Buena Vista 2S	United States	Record daily snowfall	15.2 cm (6.0 in)	49 of 100 (Notable)
Grand Lake 1 NW	United States	Record daily snowfall	12.7 cm (5.0 in)	49 of 100 (Notable)
Yampa	United States	Record daily snowfall	12.7 cm (5.0 in)	49 of 100 (Notable)
Aberdeen	United States	Record daily precipitation	61.0 mm (2.4 in)	49 of 100 (Notable)
Shuqualak	United States	Record daily precipitation	126.0 mm (5.0 in)	49 of 100 (Notable)
Benson	United States	Record daily precipitation	51.8 mm (2.0 in)	48 of 100 (Notable)
Estes Park	United States	Record daily precipitation	34.5 mm (1.4 in)	48 of 100 (Notable)
Ft Lupton 2 SE	United States	Record daily precipitation	36.8 mm (1.4 in)	48 of 100 (Notable)
Waterdale	United States	Record daily precipitation	33.3 mm (1.3 in)	48 of 100 (Notable)
Cumbalum (Fairview)	Australia	Record daily precipitation	71.6 mm (2.8 in)	47 of 100 (Notable)
Simao Dias (Anapolis)	Brazil	Record daily precipitation	50.1 mm (2.0 in)	47 of 100 (Notable)
D'Lo 2 SW	United States	Record daily precipitation	135.4 mm (5.3 in)	47 of 100 (Notable)
Crawford 5 W	United States	Record daily precipitation	79.5 mm (3.1 in)	46 of 100 (Notable)
Denver WSO City	United States	Record daily precipitation	27.2 mm (1.1 in)	46 of 100 (Notable)
Byron Bay (Jacaranda Drive)	Australia	Record daily precipitation	59.7 mm (2.4 in)	45 of 100 (Notable)
Calera	United States	Record daily precipitation	57.9 mm (2.3 in)	45 of 100 (Notable)
Mozajsk	Russia	Record daily precipitation	28.6 mm (1.1 in)	44 of 100 (Notable)
Pine Level 4 ESE	United States	Record daily precipitation	127.0 mm (5.0 in)	44 of 100 (Notable)
Ft Collins	United States	Record daily precipitation	41.1 mm (1.6 in)	44 of 100 (Notable)
Pyramid	United States	Record daily snowfall	22.9 cm (9.0 in)	43 of 100 (Notable)
Innis Plain	Australia	Record daily precipitation	61.5 mm (2.4 in)	42 of 100 (Notable)
Cheesman	United States	Record daily precipitation	28.4 mm (1.1 in)	42 of 100 (Notable)
Edinburg	United States	Record daily precipitation	63.5 mm (2.5 in)	42 of 100 (Notable)
Kosciusko	United States	Record daily precipitation	67.8 mm (2.7 in)	42 of 100 (Notable)
Mt Perry the Pines	Australia	Record daily precipitation	31.0 mm (1.2 in)	41 of 100 (Notable)
Boonara	Australia	Record daily precipitation	58.4 mm (2.3 in)	41 of 100 (Notable)
Magdeburg	Germany	Record low minimum temperature	0.0 C (32.0 F)	41 of 100 (Notable)
Kipling 4 NNW	United States	Record daily precipitation	86.6 mm (3.4 in)	41 of 100 (Notable)
State UNIV	United States	Record daily precipitation	77.2 mm (3.0 in)	41 of 100 (Notable)
Bandon 2 NNE	United States	Record high maximum temperature	30.6 C (87.1 F)	41 of 100 (Notable)
Atlanta Hartsfield-Jackson Int	United States	Record daily precipitation	69.6 mm (2.7 in)	41 of 100 (Notable)
Buzau	Romania	Record low maximum temperature	12.0 C (53.6 F)	40 of 100 (Notable)
Norwood	Australia	Record daily precipitation	35.6 mm (1.4 in)	39 of 100 (Notable)
Goondiwindi Post Office	Australia	Record daily precipitation	56.9 mm (2.2 in)	39 of 100 (Notable)
Woodenbong (Unumgar St)	Australia	Record daily precipitation	82.6 mm (3.3 in)	39 of 100 (Notable)
Ozark 6 NNW	United States	Record daily precipitation	68.1 mm (2.7 in)	39 of 100 (Notable)
Collbran	United States	Record low maximum temperature	11.1 C (52.0 F)	39 of 100 (Notable)
Gunnison 3SW	United States	Record daily snowfall	5.1 cm (2.0 in)	39 of 100 (Notable)
Haswell	United States	Record daily snowfall	10.2 cm (4.0 in)	39 of 100 (Notable)

Counts by Type and Timescale

898 records

Records set or tied on 17 September 1971 by type: Highest daily maximum 43, Lowest daily maximum 156, Highest daily minimum 96, Lowest daily minimum 182, Heaviest daily rainfall 366, Heaviest daily snowfall 49, Deepest snow cover 6.

Records on 17 September 1971 by type
Record type	Records
Highest daily maximum	43
Lowest daily maximum	156
Highest daily minimum	96
Lowest daily minimum	182
Heaviest daily rainfall	366
Heaviest daily snowfall	49
Deepest snow cover	6

Records on 17 September 1971 by timescale: all-time 1, monthly 42, daily 855.

How Much Records Were Beaten By

758 broken records

Margins by which the 758 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 305.0. Ties are not counted.

Top 20 by Significance

17 September 1971

Top 20 records on 17 September 1971 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 September 1971	Ft Collins, US	monthly snowfall	33.0 cm (13.0 in)	22.8 cm (9.0 in)	75 years	79 of 100 (Major)
17 September 1971	Byers 5 ENE, US	daily snowfall	30.5 cm (12.0 in)	30.5 cm (12.0 in)	75 years	69 of 100 (Major)
17 September 1971	Bailey, US	daily snowfall	23.6 cm (9.3 in)	23.6 cm (9.3 in)	69 years	67 of 100 (Major)
17 September 1971	Cheesman, US	daily snowfall	25.4 cm (10.0 in)	25.4 cm (10.0 in)	68 years	67 of 100 (Major)
17 September 1971	Longmont 2 ESE, US	daily rain	39.4 mm (1.6 in)	31.0 mm (1.2 in)	74 years	67 of 100 (Major)
17 September 1971	Ft Lupton 2 SE, US	monthly snowfall	30.5 cm (12.0 in)	20.3 cm (8.0 in)	35 years	66 of 100 (Major)
17 September 1971	Canton 4N, US	daily rain	82.6 mm (3.3 in)	47.5 mm (1.9 in)	76 years	64 of 100 (Major)
17 September 1971	Westcliffe, US	daily snowfall	17.8 cm (7.0 in)	17.8 cm (7.0 in)	72 years	63 of 100 (Major)
17 September 1971	Aspen, US	daily snowfall	17.3 cm (6.8 in)	17.3 cm (6.8 in)	71 years	62 of 100 (Major)
17 September 1971	Chiricahua Nm, US	daily rain	35.8 mm (1.4 in)	30.5 mm (1.2 in)	60 years	61 of 100 (Major)
17 September 1971	Rush 1N, US	daily snowfall	20.3 cm (8.0 in)	20.3 cm (8.0 in)	54 years	61 of 100 (Major)
17 September 1971	Boulder, US	daily rain	41.7 mm (1.6 in)	35.9 mm (1.4 in)	48 years	59 of 100 (Notable)
17 September 1971	Longmont 2 ESE, US	daily snowfall	15.2 cm (6.0 in)	15.2 cm (6.0 in)	75 years	59 of 100 (Notable)
17 September 1971	Parker 6 E, US	daily rain	47.0 mm (1.9 in)	47.0 mm (1.9 in)	48 years	59 of 100 (Notable)
17 September 1971	Denver WSO City, US	daily snowfall	22.9 cm (9.0 in)	22.9 cm (9.0 in)	49 years	59 of 100 (Notable)
17 September 1971	Boulder, US	monthly snowfall	45.7 cm (18.0 in)	19.3 cm (7.6 in)	11 years	58 of 100 (Notable)
17 September 1971	Red Rvr, US	monthly snowfall	30.5 cm (12.0 in)	15.3 cm (6.0 in)	34 years	56 of 100 (Notable)
17 September 1971	Taos, US	daily rain	33.0 mm (1.3 in)	21.1 mm (0.8 in)	48 years	56 of 100 (Notable)
17 September 1971	Harwood Island (Harwood Sugar, AU	daily rain	72.6 mm (2.9 in)	43.9 mm (1.7 in)	38 years	51 of 100 (Notable)
17 September 1971	Castle Rock, US	monthly snowfall	26.7 cm (10.5 in)	16.5 cm (6.5 in)	5 years	51 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

1796 to 1971

Records set or tied on this calendar date in each year from 1796 to 1971. 1971 had 898 records.

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

Records on 09-17 in each year
Year	Records
1796	1
1797	1
1805	1
1833	1
1834	1
1837	2
1845	1
1847	3
1848	1
1850	1
1851	2
1853	2
1854	2
1859	1
1862	1
1867	1
1870	1
1871	1
1872	1
1873	1
1874	1
1875	1
1877	1
1881	1
1882	2
1884	3
1885	3
1886	6
1888	2
1889	8
1891	1
1893	3
1894	1
1895	4
1896	9
1897	4
1898	7
1899	1
1900	4
1901	5
1902	5
1903	28
1904	2
1905	17
1906	10
1907	15
1908	13
1909	7
1910	38
1911	15
1912	17
1913	28
1914	38
1915	48
1916	40
1917	255
1918	41
1919	21
1920	40
1921	66
1922	47
1923	159
1924	80
1925	338
1926	154
1927	420
1928	78
1929	168
1930	147
1931	564
1932	425
1933	415
1934	246
1935	321
1936	219
1937	463
1938	363
1939	294
1940	326
1941	328
1942	581
1943	513
1944	403
1945	614
1946	620
1947	680
1948	630
1949	292
1950	412
1951	359
1952	263
1953	344
1954	449
1955	649
1956	437
1957	405
1958	806
1959	1,210
1960	385
1961	657
1962	432
1963	297
1964	559
1965	1,394
1966	523
1967	331
1968	691
1969	352
1970	412
1971	898
1972	556
1973	638
1974	491
1975	478
1976	636
1977	641
1978	764
1979	804
1980	794
1981	1,155
1982	606
1983	862
1984	1,006
1985	448
1986	1,314
1987	926
1988	982
1989	863
1990	650
1991	1,407
1992	686
1993	950
1994	986
1995	1,145
1996	1,342
1997	1,057
1998	1,137
1999	1,102
2000	1,318
2001	895
2002	1,025
2003	586
2004	872
2005	1,042
2006	1,344
2007	752
2008	886
2009	871
2010	907
2011	1,116
2012	597
2013	1,253
2014	571
2015	953
2016	707
2017	455
2018	899
2019	774
2020	651
2021	345
2022	313
2023	646
2024	954
2025	634
2026	968

Download the Data

Data for records on 1971-09-17: 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	711
50 to 100	23
100 to 150	9
150 to 200	7
200 to 250	6
250 to 300	1
300 to 350	1