Weather Records on 17 September 1999

1,102 weather records were set or tied worldwide on 17 September 1999. Highest significance: Somerville 4 NW, US.

Key Facts for 17 September 1999

On 17 September 1999, 1,102 weather records were set or tied at long-record stations worldwide.
143 were record highs and 340 were record lows, counting maximum and minimum temperature.
By timescale, 53 were all-time records, 94 monthly and 955 daily.
Somerville 4 NW set a monthly record daily precipitation of 205.7 mm (8.1 in) on 17 September 1999.
Across 164 earlier years (1796 to 2026) the same calendar date averaged 419 records.

Record Map

1,102 stations

1,102 station records on 17 September 1999 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 September 1999: highest significance records shown on the map
Station	Country	Type	Value	Significance
Somerville 4 NW	United States	Record daily precipitation	205.7 mm (8.1 in)	88 of 100 (Exceptional)
Woodstock	United States	Record daily precipitation	139.7 mm (5.5 in)	81 of 100 (Exceptional)
Saint Johnsbury	United States	Record daily precipitation	115.1 mm (4.5 in)	79 of 100 (Major)
Berlin	United States	Record daily precipitation	165.1 mm (6.5 in)	78 of 100 (Major)
Grafton	United States	Record daily precipitation	115.1 mm (4.5 in)	78 of 100 (Major)
W Pt	United States	Record daily precipitation	184.9 mm (7.3 in)	78 of 100 (Major)
Northfield	United States	Record daily precipitation	136.4 mm (5.4 in)	78 of 100 (Major)
Bakersville	United States	Record daily precipitation	188.2 mm (7.4 in)	76 of 100 (Major)
Holyoke	United States	Record daily precipitation	167.6 mm (6.6 in)	75 of 100 (Major)
Sunny Corner (Snow Line)	Australia	Record daily precipitation	135.0 mm (5.3 in)	74 of 100 (Major)
Little Falls	United States	Record daily precipitation	324.9 mm (12.8 in)	74 of 100 (Major)
Elmira	United States	Record daily precipitation	72.4 mm (2.9 in)	74 of 100 (Major)
Ithaca Cornell UNIV	United States	Record daily precipitation	79.5 mm (3.1 in)	74 of 100 (Major)
Windham 3 E	United States	Record daily precipitation	224.8 mm (8.9 in)	73 of 100 (Major)
Yorktown Hts 1W	United States	Record daily precipitation	278.1 mm (10.9 in)	71 of 100 (Major)
Gardiner	United States	Record daily precipitation	143.3 mm (5.6 in)	70 of 100 (Major)
Waterville Trtmt Plt	United States	Record daily precipitation	144.3 mm (5.7 in)	70 of 100 (Major)
Indian Lake 2SW	United States	Record daily precipitation	87.1 mm (3.4 in)	70 of 100 (Major)
Lowville	United States	Record daily precipitation	63.5 mm (2.5 in)	70 of 100 (Major)
Penn Yan	United States	Record daily precipitation	76.2 mm (3.0 in)	70 of 100 (Major)
Paupack 1 WSW	United States	Record daily precipitation	154.9 mm (6.1 in)	70 of 100 (Major)
Holland 1 E	United States	Record daily precipitation	330.2 mm (13.0 in)	70 of 100 (Major)
Storrs	United States	Record daily precipitation	110.5 mm (4.4 in)	69 of 100 (Major)
Charlotteburg Rsvr	United States	Record daily precipitation	173.0 mm (6.8 in)	69 of 100 (Major)
Sussex 1 NW	United States	Record daily precipitation	143.0 mm (5.6 in)	69 of 100 (Major)
Wanakena Rngr School	United States	Record daily precipitation	82.0 mm (3.2 in)	69 of 100 (Major)
Wertsville 4 NE	United States	Record daily precipitation	230.4 mm (9.1 in)	68 of 100 (Major)
Dannemora	United States	Record daily precipitation	115.6 mm (4.6 in)	68 of 100 (Major)
First Connecticut Lake	United States	Record daily precipitation	71.9 mm (2.8 in)	67 of 100 (Major)
Peru	United States	Record daily precipitation	120.9 mm (4.8 in)	67 of 100 (Major)
Shuttle Meadow Rsvr	United States	Record daily precipitation	208.3 mm (8.2 in)	66 of 100 (Major)
Tully Lake	United States	Record daily precipitation	116.8 mm (4.6 in)	66 of 100 (Major)
Elizabethtown	United States	Record daily precipitation	96.5 mm (3.8 in)	66 of 100 (Major)
Enosburg Falls	United States	Record daily precipitation	93.5 mm (3.7 in)	66 of 100 (Major)
Round Pond	United States	Record daily precipitation	171.5 mm (6.8 in)	65 of 100 (Major)
Lancaster	United States	Record daily precipitation	60.7 mm (2.4 in)	65 of 100 (Major)
Cornwall	United States	Record daily precipitation	101.1 mm (4.0 in)	65 of 100 (Major)
Mt Mansfield	United States	Record daily precipitation	252.0 mm (9.9 in)	65 of 100 (Major)
Hollenstein (Kraftwerk)	Germany	Record daily precipitation	41.8 mm (1.6 in)	64 of 100 (Major)
Conklingville Dam	United States	Record daily precipitation	101.9 mm (4.0 in)	64 of 100 (Major)
Matamoras	United States	Record daily precipitation	152.9 mm (6.0 in)	64 of 100 (Major)
Bound Brook 2W	United States	Record daily precipitation	172.0 mm (6.8 in)	63 of 100 (Major)
Beaver Falls	United States	Record daily precipitation	64.5 mm (2.5 in)	63 of 100 (Major)
Stillwater Rsvr	United States	Record daily precipitation	76.5 mm (3.0 in)	63 of 100 (Major)
Midland Park	United States	Record daily precipitation	218.4 mm (8.6 in)	62 of 100 (Major)
Cavendish	United States	Record daily precipitation	135.6 mm (5.3 in)	62 of 100 (Major)
Southbridge 3 SW	United States	Record daily precipitation	108.5 mm (4.3 in)	61 of 100 (Major)
Cranford	United States	Record daily precipitation	247.9 mm (9.8 in)	61 of 100 (Major)
N Creek 5 SE	United States	Record daily precipitation	91.7 mm (3.6 in)	61 of 100 (Major)
Prattsville	United States	Record daily precipitation	172.7 mm (6.8 in)	61 of 100 (Major)
Milford 2 SE	United States	Record daily precipitation	68.1 mm (2.7 in)	60 of 100 (Major)
Franklin	United States	Record daily precipitation	129.8 mm (5.1 in)	60 of 100 (Major)
Fitzwilliam 2 W	United States	Record daily precipitation	94.0 mm (3.7 in)	60 of 100 (Major)
Chepachet	United States	Record daily precipitation	126.7 mm (5.0 in)	60 of 100 (Major)
Lakeport 2	United States	Record daily precipitation	97.3 mm (3.8 in)	59 of 100 (Notable)
Greenwood Lake	United States	Record daily precipitation	172.7 mm (6.8 in)	59 of 100 (Notable)
Flemington 5 NNW	United States	Record daily precipitation	215.6 mm (8.5 in)	58 of 100 (Notable)
Alcove Dam	United States	Record daily precipitation	175.0 mm (6.9 in)	58 of 100 (Notable)
Canaan	United States	Record daily precipitation	90.9 mm (3.6 in)	58 of 100 (Notable)
Caribou WFO	United States	Record daily precipitation	66.0 mm (2.6 in)	58 of 100 (Notable)

Counts by Type and Timescale

1,102 records

Records set or tied on 17 September 1999 by type: Highest daily maximum 71, Lowest daily maximum 132, Highest daily minimum 72, Lowest daily minimum 208, Heaviest daily rainfall 618, Heaviest daily snowfall 1.

Records on 17 September 1999 by type
Record type	Records
Highest daily maximum	71
Lowest daily maximum	132
Highest daily minimum	72
Lowest daily minimum	208
Heaviest daily rainfall	618
Heaviest daily snowfall	1
Deepest snow cover	0

Records on 17 September 1999 by timescale: all-time 53, monthly 94, daily 955.

How Much Records Were Beaten By

922 broken records

Margins by which the 922 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 126.8. Ties are not counted.

Top 20 by Significance

17 September 1999

Top 20 records on 17 September 1999 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 September 1999	Somerville 4 NW, US	monthly rain	205.7 mm (8.1 in)	101.6 mm (4.0 in)	95 years	88 of 100 (Exceptional)
17 September 1999	Woodstock, US	all-time rain	139.7 mm (5.5 in)	27.2 mm (1.1 in)	104 years	81 of 100 (Exceptional)
17 September 1999	Saint Johnsbury, US	monthly rain	115.1 mm (4.5 in)	35.1 mm (1.4 in)	79 years	79 of 100 (Major)
17 September 1999	Berlin, US	all-time rain	165.1 mm (6.5 in)	34.3 mm (1.4 in)	66 years	78 of 100 (Major)
17 September 1999	Grafton, US	monthly rain	115.1 mm (4.5 in)	35.1 mm (1.4 in)	94 years	78 of 100 (Major)
17 September 1999	W Pt, US	all-time rain	184.9 mm (7.3 in)	45.2 mm (1.8 in)	74 years	78 of 100 (Major)
17 September 1999	Northfield, US	monthly rain	136.4 mm (5.4 in)	61.5 mm (2.4 in)	60 years	78 of 100 (Major)
17 September 1999	Bakersville, US	all-time rain	188.2 mm (7.4 in)	61.2 mm (2.4 in)	50 years	76 of 100 (Major)
17 September 1999	Holyoke, US	monthly rain	167.6 mm (6.6 in)	56.9 mm (2.2 in)	60 years	75 of 100 (Major)
17 September 1999	Sunny Corner (Snow Line), AU	all-time rain	135.0 mm (5.3 in)	26.8 mm (1.1 in)	49 years	74 of 100 (Major)
17 September 1999	Little Falls, US	all-time rain	324.9 mm (12.8 in)	71.7 mm (2.8 in)	28 years	74 of 100 (Major)
17 September 1999	Elmira, US	daily rain	72.4 mm (2.9 in)	43.4 mm (1.7 in)	80 years	74 of 100 (Major)
17 September 1999	Ithaca Cornell UNIV, US	daily rain	79.5 mm (3.1 in)	58.2 mm (2.3 in)	80 years	74 of 100 (Major)
17 September 1999	Windham 3 E, US	all-time rain	224.8 mm (8.9 in)	76.0 mm (3.0 in)	12 years	73 of 100 (Major)
17 September 1999	Yorktown Hts 1W, US	all-time rain	278.1 mm (10.9 in)	103.9 mm (4.1 in)	28 years	71 of 100 (Major)
17 September 1999	Gardiner, US	daily rain	143.3 mm (5.6 in)	62.0 mm (2.4 in)	66 years	70 of 100 (Major)
17 September 1999	Waterville Trtmt Plt, US	all-time rain	144.3 mm (5.7 in)	44.7 mm (1.8 in)	29 years	70 of 100 (Major)
17 September 1999	Indian Lake 2SW, US	daily rain	87.1 mm (3.4 in)	61.7 mm (2.4 in)	68 years	70 of 100 (Major)
17 September 1999	Lowville, US	daily rain	63.5 mm (2.5 in)	39.4 mm (1.6 in)	68 years	70 of 100 (Major)
17 September 1999	Penn Yan, US	daily rain	76.2 mm (3.0 in)	36.8 mm (1.4 in)	80 years	70 of 100 (Major)

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 1999

Records set or tied on this calendar date in each year from 1796 to 1999. 1999 had 1,102 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 1999-09-17: 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 20	717
20 to 40	108
40 to 60	57
60 to 80	29
80 to 100	5
100 to 120	5
120 to 140	1