Weather Records on 18 September 1977

619 weather records were set or tied worldwide on 18 September 1977. Highest significance: Cedar Rapids #1, US.

Key Facts for 18 September 1977

On 18 September 1977, 619 weather records were set or tied at long-record stations worldwide.
167 were record highs and 263 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 16 monthly and 603 daily.
Cedar Rapids #1 set a daily record precipitation of 128.5 mm (5.1 in) on 18 September 1977.
Across 163 earlier years (1803 to 2026) the same calendar date averaged 420 records.

Record Map

619 stations

619 station records on 18 September 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 September 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Cedar Rapids #1	United States	Record daily precipitation	128.5 mm (5.1 in)	71 of 100 (Major)
Mandan Exp STN	United States	Record daily precipitation	76.2 mm (3.0 in)	62 of 100 (Major)
Vinton	United States	Record daily precipitation	103.6 mm (4.1 in)	58 of 100 (Notable)
Limoeiro	Brazil	Record daily precipitation	57.0 mm (2.2 in)	53 of 100 (Notable)
Almont 7 W	United States	Record daily precipitation	50.8 mm (2.0 in)	52 of 100 (Notable)
Beulah 1 W	United States	Record daily precipitation	36.6 mm (1.4 in)	50 of 100 (Notable)
Belle Plaine	United States	Record daily precipitation	62.2 mm (2.4 in)	49 of 100 (Notable)
Millington 3 SE	United States	Record daily precipitation	55.4 mm (2.2 in)	48 of 100 (Notable)
Morris River	United States	Record daily precipitation	60.7 mm (2.4 in)	47 of 100 (Notable)
Joliet Brandon Road Lock/Dam	United States	Record daily precipitation	62.2 mm (2.4 in)	46 of 100 (Notable)
Anamosa 1 WNW	United States	Record daily precipitation	88.4 mm (3.5 in)	46 of 100 (Notable)
Yale 1 NNW	United States	Record daily precipitation	59.7 mm (2.4 in)	46 of 100 (Notable)
Independence	United States	Record daily precipitation	73.7 mm (2.9 in)	45 of 100 (Notable)
Gonvick 2 W	United States	Record daily precipitation	48.3 mm (1.9 in)	45 of 100 (Notable)
Davenport L&D 15	United States	Record daily precipitation	63.2 mm (2.5 in)	45 of 100 (Notable)
Putbus	Germany	Record low minimum temperature	3.2 C (37.8 F)	44 of 100 (Notable)
Valencia	Spain	Record daily precipitation	71.7 mm (2.8 in)	44 of 100 (Notable)
Saint Charles	United States	Record daily precipitation	52.8 mm (2.1 in)	44 of 100 (Notable)
Richardton Abbey	United States	Record daily precipitation	43.4 mm (1.7 in)	44 of 100 (Notable)
Channahon Dresden Isl Dam	United States	Record daily precipitation	69.6 mm (2.7 in)	43 of 100 (Notable)
Montezuma 1 W	United States	Record daily precipitation	67.1 mm (2.6 in)	43 of 100 (Notable)
Dickinson Exp STN	United States	Record daily precipitation	40.6 mm (1.6 in)	43 of 100 (Notable)
Medina	United States	Record daily precipitation	71.9 mm (2.8 in)	43 of 100 (Notable)
Nordby (Fano)	Denmark	Record low minimum temperature	3.1 C (37.6 F)	42 of 100 (Notable)
Palmares	Brazil	Record daily precipitation	53.0 mm (2.1 in)	41 of 100 (Notable)
Wrixum/Fohr	Germany	Record low minimum temperature	0.0 C (32.0 F)	41 of 100 (Notable)
Karlshamn	Sweden	Record low minimum temperature	-1.3 C (29.7 F)	41 of 100 (Notable)
Morgan 1 W	United States	Record daily precipitation	50.3 mm (2.0 in)	41 of 100 (Notable)
Allison	United States	Record daily precipitation	62.7 mm (2.5 in)	41 of 100 (Notable)
Caro Wwtp	United States	Record daily precipitation	47.0 mm (1.9 in)	41 of 100 (Notable)
Inga	Brazil	Record daily precipitation	58.5 mm (2.3 in)	40 of 100 (Notable)
Hillside	South Africa	Record daily precipitation	25.0 mm (1.0 in)	39 of 100 (Notable)
Tasiilaq	Greenland [Denmark]	Record daily precipitation	68.1 mm (2.7 in)	38 of 100 (Notable)
Waren	Germany	Record low minimum temperature	1.8 C (35.2 F)	38 of 100 (Notable)
N Bend SW Oregon Rgnl AP	United States	Record daily precipitation	39.1 mm (1.5 in)	38 of 100 (Notable)
Simao Dias (Anapolis)	Brazil	Record daily precipitation	31.6 mm (1.2 in)	37 of 100 (Notable)
Zagreb-Gric	Croatia	Record low maximum temperature	8.6 C (47.5 F)	37 of 100 (Notable)
Bologna	Italy	Record low minimum temperature	8.8 C (47.8 F)	37 of 100 (Notable)
Le Claire L&D 14	United States	Record daily precipitation	73.7 mm (2.9 in)	37 of 100 (Notable)
Moffit 3 SE	United States	Record daily precipitation	62.5 mm (2.5 in)	37 of 100 (Notable)
Szombathely	Hungary	Record low maximum temperature	9.7 C (49.5 F)	36 of 100 (Notable)
Gospic	Croatia	Record low maximum temperature	5.4 C (41.7 F)	35 of 100 (Notable)
Ottawa 4SW	United States	Record daily precipitation	38.9 mm (1.5 in)	35 of 100 (Notable)
Napoleon	United States	Record daily precipitation	49.0 mm (1.9 in)	35 of 100 (Notable)
New Salem 5NW	United States	Record daily precipitation	54.6 mm (2.1 in)	35 of 100 (Notable)
Debrecen Airport	Hungary	Record low maximum temperature	10.1 C (50.2 F)	34 of 100 (Routine)
Fort Cunynghame (Bos)	South Africa	Record daily precipitation	31.5 mm (1.2 in)	34 of 100 (Routine)
Marseilles Lock/Dam	United States	Record daily precipitation	55.1 mm (2.2 in)	34 of 100 (Routine)
Parshall	United States	Record daily precipitation	33.0 mm (1.3 in)	34 of 100 (Routine)
Anderson	United States	Record high minimum temperature	23.9 C (75.0 F)	34 of 100 (Routine)
Eureka WFO Woodley Is	United States	Record daily precipitation	36.8 mm (1.4 in)	34 of 100 (Routine)
Saint Johns	United States	Record daily precipitation	44.5 mm (1.8 in)	33 of 100 (Routine)
Ada	United States	Record daily precipitation	48.8 mm (1.9 in)	33 of 100 (Routine)
Chapala	Mexico	Record high minimum temperature	20.0 C (68.0 F)	32 of 100 (Routine)
Alicante	Spain	Record daily precipitation	34.8 mm (1.4 in)	32 of 100 (Routine)
Wheatfield	United States	Record daily precipitation	33.8 mm (1.3 in)	32 of 100 (Routine)
Jamestown State Hosp	United States	Record daily precipitation	61.0 mm (2.4 in)	32 of 100 (Routine)
Kristianstad	Sweden	Record low minimum temperature	-0.3 C (31.5 F)	31 of 100 (Routine)
Basel Binningen	Switzerland	Record low maximum temperature	11.1 C (52.0 F)	31 of 100 (Routine)
Gary	United States	Record daily precipitation	43.2 mm (1.7 in)	31 of 100 (Routine)

Counts by Type and Timescale

619 records

Records set or tied on 18 September 1977 by type: Highest daily maximum 50, Lowest daily maximum 127, Highest daily minimum 117, Lowest daily minimum 136, Heaviest daily rainfall 187, Heaviest daily snowfall 1, Deepest snow cover 1.

Records on 18 September 1977 by type
Record type	Records
Highest daily maximum	50
Lowest daily maximum	127
Highest daily minimum	117
Lowest daily minimum	136
Heaviest daily rainfall	187
Heaviest daily snowfall	1
Deepest snow cover	1

Records on 18 September 1977 by timescale: all-time 0, monthly 16, daily 603.

How Much Records Were Beaten By

508 broken records

Margins by which the 508 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 101.3. Ties are not counted.

Top 20 by Significance

18 September 1977

Top 20 records on 18 September 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 September 1977	Cedar Rapids #1, US	daily rain	128.5 mm (5.1 in)	101.3 mm (4.0 in)	76 years	71 of 100 (Major)
18 September 1977	Mandan Exp STN, US	monthly rain	76.2 mm (3.0 in)	34.8 mm (1.4 in)	21 years	62 of 100 (Major)
18 September 1977	Vinton, US	daily rain	103.6 mm (4.1 in)	89.1 mm (3.5 in)	35 years	58 of 100 (Notable)
18 September 1977	Limoeiro, BR	monthly rain	57.0 mm (2.2 in)	24.6 mm (1.0 in)	3 years	53 of 100 (Notable)
18 September 1977	Almont 7 W, US	daily rain	50.8 mm (2.0 in)	32.3 mm (1.3 in)	31 years	52 of 100 (Notable)
18 September 1977	Beulah 1 W, US	daily rain	36.6 mm (1.4 in)	26.7 mm (1.1 in)	31 years	50 of 100 (Notable)
18 September 1977	Belle Plaine, US	daily rain	62.2 mm (2.4 in)	40.4 mm (1.6 in)	50 years	49 of 100 (Notable)
18 September 1977	Millington 3 SE, US	daily rain	55.4 mm (2.2 in)	38.1 mm (1.5 in)	4 years	48 of 100 (Notable)
18 September 1977	Morris River, US	daily rain	60.7 mm (2.4 in)	37.3 mm (1.5 in)	50 years	47 of 100 (Notable)
18 September 1977	Joliet Brandon Road Lock/Dam, US	daily rain	62.2 mm (2.4 in)	53.1 mm (2.1 in)	12 years	46 of 100 (Notable)
18 September 1977	Anamosa 1 WNW, US	daily rain	88.4 mm (3.5 in)	68.8 mm (2.7 in)	8 years	46 of 100 (Notable)
18 September 1977	Yale 1 NNW, US	daily rain	59.7 mm (2.4 in)	30.5 mm (1.2 in)	28 years	46 of 100 (Notable)
18 September 1977	Independence, US	daily rain	73.7 mm (2.9 in)	22.9 mm (0.9 in)	76 years	45 of 100 (Notable)
18 September 1977	Gonvick 2 W, US	daily rain	48.3 mm (1.9 in)	28.0 mm (1.1 in)	55 years	45 of 100 (Notable)
18 September 1977	Davenport L&D 15, US	daily rain	63.2 mm (2.5 in)	38.3 mm (1.5 in)	43 years	45 of 100 (Notable)
18 September 1977	Putbus, DE	daily low min	3.2 C (37.8 F)	1.2 C (2.2 F)	105 years	44 of 100 (Notable)
18 September 1977	Valencia, ES	daily rain	71.7 mm (2.8 in)	46.7 mm (1.8 in)	32 years	44 of 100 (Notable)
18 September 1977	Saint Charles, US	daily rain	52.8 mm (2.1 in)	37.1 mm (1.5 in)	24 years	44 of 100 (Notable)
18 September 1977	Richardton Abbey, US	daily rain	43.4 mm (1.7 in)	29.9 mm (1.2 in)	20 years	44 of 100 (Notable)
18 September 1977	Channahon Dresden Isl Dam, US	daily rain	69.6 mm (2.7 in)	53.1 mm (2.1 in)	4 years	43 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

1803 to 1977

Records set or tied on this calendar date in each year from 1803 to 1977. 1977 had 619 records.

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

Records on 09-18 in each year
Year	Records
1803	1
1811	1
1814	1
1819	1
1829	1
1832	1
1834	1
1835	1
1837	2
1847	2
1848	1
1849	1
1851	4
1859	1
1861	1
1865	1
1869	1
1871	1
1875	1
1876	2
1877	1
1879	1
1880	1
1881	1
1882	1
1885	1
1886	4
1889	6
1890	1
1891	1
1893	4
1894	2
1895	2
1896	4
1897	3
1898	5
1899	3
1900	2
1901	10
1902	8
1903	58
1904	6
1905	22
1906	16
1907	4
1908	11
1909	17
1910	5
1911	8
1912	43
1913	44
1914	56
1915	41
1916	58
1917	99
1918	57
1919	48
1920	56
1921	213
1922	45
1923	114
1924	62
1925	269
1926	205
1927	189
1928	114
1929	309
1930	124
1931	429
1932	226
1933	370
1934	188
1935	281
1936	155
1937	422
1938	373
1939	190
1940	402
1941	318
1942	1,001
1943	624
1944	503
1945	732
1946	576
1947	927
1948	427
1949	356
1950	370
1951	320
1952	340
1953	245
1954	446
1955	672
1956	587
1957	429
1958	491
1959	829
1960	351
1961	478
1962	360
1963	453
1964	282
1965	1,172
1966	498
1967	357
1968	763
1969	424
1970	377
1971	1,245
1972	691
1973	593
1974	559
1975	976
1976	615
1977	619
1978	1,162
1979	709
1980	652
1981	1,671
1982	603
1983	936
1984	951
1985	636
1986	730
1987	1,244
1988	997
1989	778
1990	904
1991	1,377
1992	821
1993	747
1994	852
1995	935
1996	1,237
1997	935
1998	1,038
1999	583
2000	1,146
2001	993
2002	828
2003	815
2004	1,027
2005	781
2006	1,309
2007	670
2008	697
2009	692
2010	1,040
2011	1,050
2012	922
2013	666
2014	682
2015	934
2016	893
2017	518
2018	1,200
2019	768
2020	682
2021	582
2022	613
2023	639
2024	687
2025	471
2026	864

Download the Data

Data for records on 1977-09-18: 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	468
20 to 40	30
40 to 60	7
60 to 80	1
80 to 100	1
100 to 120	1