Weather Records on 20 July 1977

899 weather records were set or tied worldwide on 20 July 1977. Highest significance: Johnstown, US.

Key Facts for 20 July 1977

On 20 July 1977, 899 weather records were set or tied at long-record stations worldwide.
623 were record highs and 117 were record lows, counting maximum and minimum temperature.
By timescale, 17 were all-time records, 21 monthly and 861 daily.
Johnstown set an all-time record daily precipitation of 222.3 mm (8.8 in) on 20 July 1977.
Across 161 earlier years (1809 to 2026) the same calendar date averaged 456 records.

Record Map

899 stations

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

Weather records on 20 July 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Johnstown	United States	Record daily precipitation	222.3 mm (8.8 in)	87 of 100 (Exceptional)
Piranhas (Marechal Floriano)	Brazil	Record daily precipitation	35.8 mm (1.4 in)	64 of 100 (Major)
Marion Ctr 2 SE	United States	Record daily precipitation	132.3 mm (5.2 in)	61 of 100 (Major)
Buffalo Mills	United States	Record daily precipitation	119.4 mm (4.7 in)	60 of 100 (Major)
Blanding	United States	Record daily precipitation	29.7 mm (1.2 in)	56 of 100 (Notable)
Troicko-Pecherskoe	Russia	Record daily precipitation	38.2 mm (1.5 in)	53 of 100 (Notable)
Bugulma	Russia	Record daily precipitation	47.0 mm (1.9 in)	52 of 100 (Notable)
Rush 1N	United States	Record daily precipitation	74.9 mm (2.9 in)	52 of 100 (Notable)
Creekside	United States	Record daily precipitation	114.6 mm (4.5 in)	49 of 100 (Notable)
Clarion 3 SW	United States	Record daily precipitation	86.9 mm (3.4 in)	48 of 100 (Notable)
Kassler	United States	Record daily precipitation	43.2 mm (1.7 in)	47 of 100 (Notable)
Allenspark 2SE	United States	Record daily precipitation	43.2 mm (1.7 in)	46 of 100 (Notable)
Hohenpeissenberg	Germany	Record daily precipitation	43.2 mm (1.7 in)	45 of 100 (Notable)
Springerville	United States	Record daily precipitation	56.6 mm (2.2 in)	45 of 100 (Notable)
Manassa	United States	Record daily precipitation	27.7 mm (1.1 in)	44 of 100 (Notable)
Indiana 3 SE	United States	Record daily precipitation	133.9 mm (5.3 in)	44 of 100 (Notable)
Toronto	Canada	Record high maximum temperature	36.7 C (98.1 F)	43 of 100 (Notable)
Winter	United States	Record high minimum temperature	22.2 C (72.0 F)	43 of 100 (Notable)
Skogsforsen	Sweden	Record daily precipitation	35.5 mm (1.4 in)	42 of 100 (Notable)
Everett	United States	Record daily precipitation	109.2 mm (4.3 in)	41 of 100 (Notable)
Bar Harbor 3 NW	United States	Record high minimum temperature	26.1 C (79.0 F)	40 of 100 (Notable)
Rockport 1 ESE	United States	Record high minimum temperature	24.4 C (75.9 F)	40 of 100 (Notable)
Morgantown Muni AP	United States	Record high maximum temperature	35.6 C (96.1 F)	40 of 100 (Notable)
Nornalup	Australia	Record daily precipitation	39.4 mm (1.6 in)	39 of 100 (Notable)
Elberton 2 N	United States	Record high maximum temperature	38.9 C (102.0 F)	39 of 100 (Notable)
Orono	United States	Record high maximum temperature	37.2 C (99.0 F)	39 of 100 (Notable)
Bethlehem	United States	Record high maximum temperature	34.4 C (93.9 F)	39 of 100 (Notable)
Escanaba	United States	Record high minimum temperature	21.1 C (70.0 F)	39 of 100 (Notable)
Manderson 3 NE	United States	Record daily precipitation	43.4 mm (1.7 in)	38 of 100 (Notable)
Kearneysville	United States	Record daily precipitation	77.5 mm (3.1 in)	38 of 100 (Notable)
Port Washington	United States	Record high minimum temperature	23.9 C (75.0 F)	38 of 100 (Notable)
Manassas 3 NW	United States	Record high maximum temperature	37.8 C (100.0 F)	37 of 100 (Notable)
Chilton	United States	Record high minimum temperature	24.4 C (75.9 F)	37 of 100 (Notable)
Sturgeon Bay Exp Farm	United States	Record high minimum temperature	25.6 C (78.1 F)	37 of 100 (Notable)
Kamloops	Canada	Record low minimum temperature	8.3 C (46.9 F)	36 of 100 (Notable)
Cambridge Galt Moe	Canada	Record high maximum temperature	34.0 C (93.2 F)	36 of 100 (Notable)
Blue Hill Coop	United States	Record high minimum temperature	22.8 C (73.0 F)	36 of 100 (Notable)
Ionia 2SSW	United States	Record high minimum temperature	22.8 C (73.0 F)	36 of 100 (Notable)
Madawaska	Canada	Record high maximum temperature	37.8 C (100.0 F)	35 of 100 (Notable)
Bancroft	Canada	Record high maximum temperature	36.1 C (97.0 F)	35 of 100 (Notable)
Saint Johns	United States	Record high maximum temperature	36.1 C (97.0 F)	35 of 100 (Notable)
Langley AFB	United States	Record high minimum temperature	27.8 C (82.0 F)	35 of 100 (Notable)
Southampton	Canada	Record high minimum temperature	23.3 C (73.9 F)	34 of 100 (Routine)
San Felipe	Mexico	Record low minimum temperature	11.7 C (53.1 F)	34 of 100 (Routine)
Chapulco	Mexico	Record high minimum temperature	17.2 C (63.0 F)	34 of 100 (Routine)
Grayling	United States	Record high maximum temperature	37.8 C (100.0 F)	34 of 100 (Routine)
Winthrop UNIV	United States	Record high minimum temperature	24.4 C (75.9 F)	34 of 100 (Routine)
Ottawa Cda	Canada	Record high maximum temperature	34.5 C (94.1 F)	33 of 100 (Routine)
Durham	Canada	Record high maximum temperature	33.3 C (91.9 F)	33 of 100 (Routine)
St Hyacinthe	Canada	Record high maximum temperature	33.9 C (93.0 F)	33 of 100 (Routine)
Asmara	Eritrea	Record daily precipitation	56.8 mm (2.2 in)	33 of 100 (Routine)
Maricopa	United States	Record low minimum temperature	10.0 C (50.0 F)	33 of 100 (Routine)
Grafton	United States	Record high maximum temperature	34.4 C (93.9 F)	33 of 100 (Routine)
Hightstown 2 W	United States	Record high maximum temperature	37.2 C (99.0 F)	33 of 100 (Routine)
Greenville	United States	Record high maximum temperature	38.9 C (102.0 F)	33 of 100 (Routine)
Putneyville 2 SE Dam	United States	Record daily precipitation	77.5 mm (3.1 in)	33 of 100 (Routine)
Grand Lac Victoria	Canada	Record high maximum temperature	33.9 C (93.0 F)	32 of 100 (Routine)
Ekaterino-Nikolskoe	Russia	Record high maximum temperature	36.0 C (96.8 F)	32 of 100 (Routine)
Umea	Sweden	Record low maximum temperature	12.2 C (54.0 F)	32 of 100 (Routine)
Gaylord	United States	Record high maximum temperature	36.1 C (97.0 F)	32 of 100 (Routine)

Counts by Type and Timescale

899 records

Records set or tied on 20 July 1977 by type: Highest daily maximum 289, Lowest daily maximum 44, Highest daily minimum 334, Lowest daily minimum 73, Heaviest daily rainfall 159.

Records on 20 July 1977 by type
Record type	Records
Highest daily maximum	289
Lowest daily maximum	44
Highest daily minimum	334
Lowest daily minimum	73
Heaviest daily rainfall	159
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 20 July 1977 by timescale: all-time 17, monthly 21, daily 861.

How Much Records Were Beaten By

652 broken records

Margins by which the 652 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 109.0. Ties are not counted.

Top 20 by Significance

20 July 1977

Top 20 records on 20 July 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 July 1977	Johnstown, US	all-time rain	222.3 mm (8.8 in)	109.0 mm (4.3 in)	65 years	87 of 100 (Exceptional)
20 July 1977	Piranhas (Marechal Floriano), BR	daily rain	35.8 mm (1.4 in)	21.6 mm (0.9 in)	60 years	64 of 100 (Major)
20 July 1977	Marion Ctr 2 SE, US	monthly rain	132.3 mm (5.2 in)	71.3 mm (2.8 in)	27 years	61 of 100 (Major)
20 July 1977	Buffalo Mills, US	monthly rain	119.4 mm (4.7 in)	37.4 mm (1.5 in)	35 years	60 of 100 (Major)
20 July 1977	Blanding, US	daily rain	29.7 mm (1.2 in)	19.5 mm (0.8 in)	52 years	56 of 100 (Notable)
20 July 1977	Troicko-Pecherskoe, RU	daily rain	38.2 mm (1.5 in)	11.7 mm (0.5 in)	88 years	53 of 100 (Notable)
20 July 1977	Bugulma, RU	daily rain	47.0 mm (1.9 in)	24.3 mm (1.0 in)	51 years	52 of 100 (Notable)
20 July 1977	Rush 1N, US	monthly rain	74.9 mm (2.9 in)	19.8 mm (0.8 in)	36 years	52 of 100 (Notable)
20 July 1977	Creekside, US	monthly rain	114.6 mm (4.5 in)	25.7 mm (1.0 in)	53 years	49 of 100 (Notable)
20 July 1977	Clarion 3 SW, US	daily rain	86.9 mm (3.4 in)	43.7 mm (1.7 in)	14 years	48 of 100 (Notable)
20 July 1977	Kassler, US	daily rain	43.2 mm (1.7 in)	24.7 mm (1.0 in)	32 years	47 of 100 (Notable)
20 July 1977	Allenspark 2SE, US	daily rain	43.2 mm (1.7 in)	26.7 mm (1.1 in)	16 years	46 of 100 (Notable)
20 July 1977	Hohenpeissenberg, DE	daily rain	43.2 mm (1.7 in)	9.9 mm (0.39 in)	84 years	45 of 100 (Notable)
20 July 1977	Springerville, US	all-time rain	56.6 mm (2.2 in)	2.5 mm (0.10 in)	56 years	45 of 100 (Notable)
20 July 1977	Manassa, US	daily rain	27.7 mm (1.1 in)	10.4 mm (0.4 in)	47 years	44 of 100 (Notable)
20 July 1977	Indiana 3 SE, US	all-time rain	133.9 mm (5.3 in)	25.7 mm (1.0 in)	5 years	44 of 100 (Notable)
20 July 1977	Toronto, CA	daily high max	36.7 C (98.1 F)	1.1 C (2.0 F)	122 years	43 of 100 (Notable)
20 July 1977	Winter, US	all-time high min	22.2 C (72.0 F)	0.5 C (0.9 F)	56 years	43 of 100 (Notable)
20 July 1977	Skogsforsen, SE	daily rain	35.5 mm (1.4 in)	24.5 mm (1.0 in)	31 years	42 of 100 (Notable)
20 July 1977	Everett, US	all-time rain	109.2 mm (4.3 in)	9.1 mm (0.36 in)	22 years	41 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

1809 to 1977

Records set or tied on this calendar date in each year from 1809 to 1977. 1977 had 899 records.

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

Records on 07-20 in each year
Year	Records
1809	1
1810	1
1811	2
1832	2
1844	2
1850	1
1859	2
1863	1
1865	4
1866	1
1867	1
1868	1
1870	1
1872	1
1874	2
1876	1
1877	2
1879	3
1880	1
1881	2
1882	1
1883	2
1885	1
1886	2
1887	1
1888	1
1889	2
1890	5
1892	7
1893	1
1894	1
1895	1
1897	4
1898	2
1899	4
1900	9
1901	3
1902	13
1903	6
1904	10
1905	6
1906	8
1907	12
1908	31
1909	6
1910	27
1911	12
1912	33
1913	28
1914	20
1915	163
1916	117
1917	57
1918	53
1919	40
1920	16
1921	55
1922	52
1923	173
1924	112
1925	125
1926	411
1927	106
1928	366
1929	480
1930	598
1931	362
1932	338
1933	201
1934	857
1935	386
1936	358
1937	213
1938	392
1939	336
1940	325
1941	270
1942	609
1943	326
1944	470
1945	278
1946	482
1947	635
1948	385
1949	807
1950	563
1951	448
1952	488
1953	316
1954	512
1955	377
1956	545
1957	351
1958	536
1959	605
1960	758
1961	338
1962	327
1963	457
1964	416
1965	1,110
1966	469
1967	455
1968	389
1969	649
1970	890
1971	619
1972	1,062
1973	804
1974	489
1975	470
1976	580
1977	899
1978	663
1979	1,249
1980	925
1981	1,048
1982	580
1983	1,117
1984	799
1985	604
1986	848
1987	1,156
1988	1,103
1989	1,183
1990	724
1991	1,024
1992	1,137
1993	901
1994	611
1995	961
1996	1,365
1997	903
1998	1,682
1999	815
2000	1,393
2001	755
2002	986
2003	1,313
2004	978
2005	1,266
2006	1,487
2007	1,124
2008	663
2009	1,533
2010	1,154
2011	1,339
2012	817
2013	850
2014	1,000
2015	812
2016	744
2017	398
2018	930
2019	867
2020	524
2021	683
2022	1,108
2023	812
2024	737
2025	680
2026	863

Download the Data

Data for records on 1977-07-20: 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	635
20 to 40	14
40 to 60	1
60 to 80	1
80 to 100	0
100 to 120	1