Weather Records on 20 September 1977

776 weather records were set or tied worldwide on 20 September 1977. Highest significance: Corvallis State UNIV, US.

Key Facts for 20 September 1977

On 20 September 1977, 776 weather records were set or tied at long-record stations worldwide.
180 were record highs and 348 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 33 monthly and 743 daily.
Corvallis State UNIV set a daily record precipitation of 36.6 mm (1.4 in) on 20 September 1977.
Across 156 earlier years (1812 to 2026) the same calendar date averaged 440 records.

Record Map

776 stations

776 station records on 20 September 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 September 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Corvallis State UNIV	United States	Record daily precipitation	36.6 mm (1.4 in)	60 of 100 (Major)
Dansville	United States	Record daily precipitation	59.7 mm (2.4 in)	59 of 100 (Notable)
El Carmen (Smn)	Mexico	Record daily precipitation	172.5 mm (6.8 in)	54 of 100 (Notable)
Heritage	South Africa	Record daily precipitation	44.5 mm (1.8 in)	53 of 100 (Notable)
Hemlock	United States	Record daily precipitation	47.2 mm (1.9 in)	52 of 100 (Notable)
Narrogin	Australia	Record high maximum temperature	36.4 C (97.5 F)	51 of 100 (Notable)
Beatrice	Canada	Record daily precipitation	31.4 mm (1.2 in)	48 of 100 (Notable)
St Hyacinthe	Canada	Record daily precipitation	45.2 mm (1.8 in)	47 of 100 (Notable)
Canandaigua 3 S	United States	Record daily precipitation	59.7 mm (2.4 in)	47 of 100 (Notable)
Indus 3 W	United States	Record daily precipitation	50.0 mm (2.0 in)	46 of 100 (Notable)
Armagh	United Kingdom	Record low maximum temperature	10.4 C (50.7 F)	44 of 100 (Notable)
Usina Itatinga	Brazil	Record daily precipitation	97.9 mm (3.9 in)	42 of 100 (Notable)
Cortland	United States	Record daily precipitation	27.9 mm (1.1 in)	42 of 100 (Notable)
Umlaas Waterworks	South Africa	Record daily precipitation	45.2 mm (1.8 in)	41 of 100 (Notable)
Middletown 4 W	United States	Record daily precipitation	58.2 mm (2.3 in)	41 of 100 (Notable)
Avon	United States	Record daily precipitation	27.9 mm (1.1 in)	40 of 100 (Notable)
Warden (Mag)	South Africa	Record daily precipitation	47.0 mm (1.9 in)	39 of 100 (Notable)
Bulahdelah Post Office	Australia	Record daily precipitation	51.0 mm (2.0 in)	38 of 100 (Notable)
Chita	Russia	Record low minimum temperature	-8.5 C (16.7 F)	38 of 100 (Notable)
Volta Ph	United States	Record daily precipitation	35.8 mm (1.4 in)	38 of 100 (Notable)
Arcade	United States	Record daily precipitation	61.7 mm (2.4 in)	37 of 100 (Notable)
Palmerville	Australia	Record low maximum temperature	30.0 C (86.0 F)	36 of 100 (Notable)
Montreal McGill	Canada	Record low maximum temperature	7.8 C (46.0 F)	36 of 100 (Notable)
Galway	Ireland	Record low maximum temperature	12.5 C (54.5 F)	36 of 100 (Notable)
Zharkent	Kazakhstan	Record high minimum temperature	15.8 C (60.4 F)	36 of 100 (Notable)
Wien	Austria	Record low maximum temperature	9.0 C (48.2 F)	35 of 100 (Notable)
Munchen-Nymphenburg	Germany	Record low maximum temperature	6.7 C (44.1 F)	35 of 100 (Notable)
Heinersreuth-Vollhof	Germany	Record low maximum temperature	7.5 C (45.5 F)	35 of 100 (Notable)
Vectis, Winterton	South Africa	Record daily precipitation	46.2 mm (1.8 in)	35 of 100 (Notable)
Roxboro 7 ESE	United States	Record high minimum temperature	21.1 C (70.0 F)	35 of 100 (Notable)
Shenkursk	Russia	Record low minimum temperature	-4.4 C (24.1 F)	34 of 100 (Routine)
Little Falls Mill St	United States	Record daily precipitation	40.1 mm (1.6 in)	34 of 100 (Routine)
Weissenburg	Germany	Record low maximum temperature	7.5 C (45.5 F)	33 of 100 (Routine)
Poretskoye	Russia	Record low maximum temperature	5.4 C (41.7 F)	33 of 100 (Routine)
Shasta Dam	United States	Record daily precipitation	82.3 mm (3.2 in)	33 of 100 (Routine)
Ft Robinson	United States	Record high minimum temperature	18.3 C (64.9 F)	33 of 100 (Routine)
Morrisville 6 SW	United States	Record daily precipitation	43.9 mm (1.7 in)	33 of 100 (Routine)
Hohenpeissenberg	Germany	Record low maximum temperature	3.8 C (38.8 F)	32 of 100 (Routine)
Coloso	Puerto Rico [United States]	Record low maximum temperature	30.0 C (86.0 F)	32 of 100 (Routine)
Batavia	United States	Record daily precipitation	37.3 mm (1.5 in)	32 of 100 (Routine)
Penn Yan	United States	Record daily precipitation	53.3 mm (2.1 in)	32 of 100 (Routine)
Drain	United States	Record high minimum temperature	14.4 C (57.9 F)	32 of 100 (Routine)
Raymond Terrace (Kinross)	Australia	Record daily precipitation	30.0 mm (1.2 in)	31 of 100 (Routine)
Collegeville	Canada	Record low maximum temperature	10.6 C (51.1 F)	31 of 100 (Routine)
Charlottetown Cda	Canada	Record low maximum temperature	9.5 C (49.1 F)	31 of 100 (Routine)
Gospic	Croatia	Record low maximum temperature	7.2 C (45.0 F)	31 of 100 (Routine)
Szombathely	Hungary	Record low maximum temperature	9.4 C (48.9 F)	31 of 100 (Routine)
Monroe	United States	Record daily precipitation	50.3 mm (2.0 in)	31 of 100 (Routine)
Gouvea	Brazil	Record daily precipitation	25.3 mm (1.0 in)	30 of 100 (Routine)
Cartwright	Canada	Record daily precipitation	28.4 mm (1.1 in)	30 of 100 (Routine)
Tasiilaq	Greenland [Denmark]	Record high minimum temperature	4.9 C (40.8 F)	30 of 100 (Routine)
Debrecen Airport	Hungary	Record low maximum temperature	12.6 C (54.7 F)	30 of 100 (Routine)
Zuerich/Fluntern	Switzerland	Record low maximum temperature	8.3 C (46.9 F)	30 of 100 (Routine)
Moncton	Canada	Record low maximum temperature	10.5 C (50.9 F)	29 of 100 (Routine)
Big Sur STN	United States	Record daily precipitation	29.7 mm (1.2 in)	29 of 100 (Routine)
Truckee Rs	United States	Record low maximum temperature	8.9 C (48.0 F)	29 of 100 (Routine)
Liberal	United States	Record high maximum temperature	36.7 C (98.1 F)	29 of 100 (Routine)
Portageville 1N	United States	Record daily precipitation	33.5 mm (1.3 in)	29 of 100 (Routine)
Concord ASOS	United States	Record daily precipitation	55.4 mm (2.2 in)	29 of 100 (Routine)
Sorel	Canada	Record low maximum temperature	8.3 C (46.9 F)	28 of 100 (Routine)

Counts by Type and Timescale

776 records

Records set or tied on 20 September 1977 by type: Highest daily maximum 84, Lowest daily maximum 259, Highest daily minimum 96, Lowest daily minimum 89, Heaviest daily rainfall 248.

Records on 20 September 1977 by type
Record type	Records
Highest daily maximum	84
Lowest daily maximum	259
Highest daily minimum	96
Lowest daily minimum	89
Heaviest daily rainfall	248
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 20 September 1977 by timescale: all-time 0, monthly 33, daily 743.

How Much Records Were Beaten By

661 broken records

Margins by which the 661 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 131.6. Ties are not counted.

Top 20 by Significance

20 September 1977

Top 20 records on 20 September 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 September 1977	Corvallis State UNIV, US	daily rain	36.6 mm (1.4 in)	22.9 mm (0.9 in)	67 years	60 of 100 (Major)
20 September 1977	Dansville, US	daily rain	59.7 mm (2.4 in)	38.1 mm (1.5 in)	46 years	59 of 100 (Notable)
20 September 1977	El Carmen (Smn), MX	daily rain	172.5 mm (6.8 in)	131.6 mm (5.2 in)	32 years	54 of 100 (Notable)
20 September 1977	Heritage, ZA	daily rain	44.5 mm (1.8 in)	30.5 mm (1.2 in)	44 years	53 of 100 (Notable)
20 September 1977	Hemlock, US	daily rain	47.2 mm (1.9 in)	27.9 mm (1.1 in)	46 years	52 of 100 (Notable)
20 September 1977	Narrogin, AU	monthly high max	36.4 C (97.5 F)	6.0 C (10.8 F)	58 years	51 of 100 (Notable)
20 September 1977	Beatrice, CA	daily rain	31.4 mm (1.2 in)	10.6 mm (0.4 in)	90 years	48 of 100 (Notable)
20 September 1977	St Hyacinthe, CA	daily rain	45.2 mm (1.8 in)	14.5 mm (0.6 in)	82 years	47 of 100 (Notable)
20 September 1977	Canandaigua 3 S, US	daily rain	59.7 mm (2.4 in)	31.0 mm (1.2 in)	28 years	47 of 100 (Notable)
20 September 1977	Indus 3 W, US	daily rain	50.0 mm (2.0 in)	41.9 mm (1.6 in)	10 years	46 of 100 (Notable)
20 September 1977	Armagh, GB	daily low max	10.4 C (50.7 F)	1.0 C (1.8 F)	104 years	44 of 100 (Notable)
20 September 1977	Usina Itatinga, BR	daily rain	97.9 mm (3.9 in)	64.3 mm (2.5 in)	26 years	42 of 100 (Notable)
20 September 1977	Cortland, US	daily rain	27.9 mm (1.1 in)	11.1 mm (0.4 in)	79 years	42 of 100 (Notable)
20 September 1977	Umlaas Waterworks, ZA	daily rain	45.2 mm (1.8 in)	26.9 mm (1.1 in)	36 years	41 of 100 (Notable)
20 September 1977	Middletown 4 W, US	daily rain	58.2 mm (2.3 in)	11.7 mm (0.5 in)	82 years	41 of 100 (Notable)
20 September 1977	Avon, US	daily rain	27.9 mm (1.1 in)	12.7 mm (0.5 in)	60 years	40 of 100 (Notable)
20 September 1977	Warden (Mag), ZA	daily rain	47.0 mm (1.9 in)	26.7 mm (1.1 in)	28 years	39 of 100 (Notable)
20 September 1977	Bulahdelah Post Office, AU	daily rain	51.0 mm (2.0 in)	18.7 mm (0.7 in)	62 years	38 of 100 (Notable)
20 September 1977	Chita, RU	daily low min	-8.5 C (16.7 F)	2.2 C (4.0 F)	83 years	38 of 100 (Notable)
20 September 1977	Volta Ph, US	daily rain	35.8 mm (1.4 in)	28.4 mm (1.1 in)	20 years	38 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 1977

Records set or tied on this calendar date in each year from 1812 to 1977. 1977 had 776 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 1977-09-20: 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 20	629
20 to 40	27
40 to 60	2
60 to 80	2
80 to 100	0
100 to 120	0
120 to 140	1