Weather Records on 30 September 1977

870 weather records were set or tied worldwide on 30 September 1977. Highest significance: Big Sandy, US.

Key Facts for 30 September 1977

On 30 September 1977, 870 weather records were set or tied at long-record stations worldwide.
394 were record highs and 107 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 19 monthly and 850 daily.
Big Sandy set a daily record precipitation of 28.4 mm (1.1 in) on 30 September 1977.
Across 161 earlier years (1806 to 2026) the same calendar date averaged 437 records.

Record Map

870 stations

870 station records on 30 September 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 30 September 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Big Sandy	United States	Record daily precipitation	28.4 mm (1.1 in)	53 of 100 (Notable)
Broadus	United States	Record daily precipitation	30.2 mm (1.2 in)	53 of 100 (Notable)
Foremost	Canada	Record daily precipitation	25.7 mm (1.0 in)	51 of 100 (Notable)
Manhattan	United States	Record daily precipitation	26.2 mm (1.0 in)	50 of 100 (Notable)
Sioux Falls	United States	Record daily precipitation	68.8 mm (2.7 in)	50 of 100 (Notable)
Crane Nsa	United States	Record daily precipitation	82.8 mm (3.3 in)	49 of 100 (Notable)
Dwingelo	Netherlands	Record daily precipitation	28.6 mm (1.1 in)	44 of 100 (Notable)
Winner	United States	Record daily precipitation	29.7 mm (1.2 in)	44 of 100 (Notable)
Canistota 2 N	United States	Record daily precipitation	63.0 mm (2.5 in)	43 of 100 (Notable)
Astrakan	Russia	Record low minimum temperature	-0.5 C (31.1 F)	42 of 100 (Notable)
Tomta	Sweden	Record daily precipitation	32.5 mm (1.3 in)	42 of 100 (Notable)
Buzau	Romania	Record low minimum temperature	-2.0 C (28.4 F)	41 of 100 (Notable)
Virginia City	United States	Record daily snowfall	15.2 cm (6.0 in)	41 of 100 (Notable)
Ennis	United States	Record daily precipitation	30.7 mm (1.2 in)	40 of 100 (Notable)
Anadarko 3 E	United States	Record high maximum temperature	40.0 C (104.0 F)	40 of 100 (Notable)
Bolivar Wtr Wks	United States	Record daily precipitation	57.4 mm (2.3 in)	40 of 100 (Notable)
Flatwillow 4 ENE	United States	Record daily precipitation	25.4 mm (1.0 in)	39 of 100 (Notable)
Mullen 3S	United States	Record daily precipitation	41.9 mm (1.6 in)	39 of 100 (Notable)
Purdum	United States	Record daily precipitation	41.1 mm (1.6 in)	39 of 100 (Notable)
Bom Jesus da Lapa	Brazil	Record daily precipitation	32.0 mm (1.3 in)	38 of 100 (Notable)
Haskell	United States	Record high minimum temperature	23.9 C (75.0 F)	37 of 100 (Notable)
Chita	Russia	Record low minimum temperature	-10.7 C (12.7 F)	36 of 100 (Notable)
Enkoping	Sweden	Record daily precipitation	31.6 mm (1.2 in)	36 of 100 (Notable)
Macomb	United States	Record daily precipitation	36.3 mm (1.4 in)	36 of 100 (Notable)
Healdton 3 E	United States	Record high maximum temperature	38.3 C (100.9 F)	36 of 100 (Notable)
Armour	United States	Record daily precipitation	30.5 mm (1.2 in)	36 of 100 (Notable)
Bryant	United States	Record daily precipitation	28.2 mm (1.1 in)	36 of 100 (Notable)
Clear Lake	United States	Record daily precipitation	28.4 mm (1.1 in)	36 of 100 (Notable)
Luverne	United States	Record daily precipitation	55.4 mm (2.2 in)	35 of 100 (Notable)
Three Lynx	United States	Record daily precipitation	41.7 mm (1.6 in)	35 of 100 (Notable)
Brady	United States	Record high minimum temperature	22.2 C (72.0 F)	35 of 100 (Notable)
San Angelo	United States	Record high minimum temperature	23.9 C (75.0 F)	35 of 100 (Notable)
Quinter	United States	Record high minimum temperature	16.7 C (62.1 F)	34 of 100 (Routine)
Russell Springs	United States	Record high minimum temperature	16.1 C (61.0 F)	34 of 100 (Routine)
Broken Bow 2 W	United States	Record high minimum temperature	15.6 C (60.1 F)	34 of 100 (Routine)
Bloomfield 3 SE	United States	Record high minimum temperature	16.7 C (62.1 F)	34 of 100 (Routine)
Hatch	United States	Record high maximum temperature	35.0 C (95.0 F)	34 of 100 (Routine)
Conroe	United States	Record high minimum temperature	24.4 C (75.9 F)	34 of 100 (Routine)
Milford 4 NW	United States	Record daily precipitation	56.9 mm (2.2 in)	33 of 100 (Routine)
Trident	United States	Record daily precipitation	43.2 mm (1.7 in)	33 of 100 (Routine)
Meeker 5 W	United States	Record high maximum temperature	36.1 C (97.0 F)	33 of 100 (Routine)
Miles City AP	United States	Record daily precipitation	25.4 mm (1.0 in)	33 of 100 (Routine)
Springfield Abraham Lincoln Ca	United States	Record daily precipitation	40.6 mm (1.6 in)	33 of 100 (Routine)
Moscow U of I	United States	Record low maximum temperature	9.4 C (48.9 F)	32 of 100 (Routine)
Norris Madison Pwr House	United States	Record daily precipitation	29.5 mm (1.2 in)	32 of 100 (Routine)
Erick	United States	Record high maximum temperature	38.3 C (100.9 F)	32 of 100 (Routine)
Fredericksburg	United States	Record high maximum temperature	34.4 C (93.9 F)	32 of 100 (Routine)
Georgetown	United States	Record high maximum temperature	36.7 C (98.1 F)	32 of 100 (Routine)
Midland 4 ENE	United States	Record high minimum temperature	22.8 C (73.0 F)	32 of 100 (Routine)
Sonora	United States	Record high maximum temperature	36.7 C (98.1 F)	32 of 100 (Routine)
Texarkana Webb Fld	United States	Record high minimum temperature	23.3 C (73.9 F)	32 of 100 (Routine)
Huetamo	Mexico	Record low minimum temperature	16.1 C (61.0 F)	31 of 100 (Routine)
Blagovescensk	Russia	Record low minimum temperature	-3.5 C (25.7 F)	31 of 100 (Routine)
Hillsboro	United States	Record high maximum temperature	32.8 C (91.0 F)	31 of 100 (Routine)
Healdton 3 E	United States	Record high minimum temperature	23.3 C (73.9 F)	31 of 100 (Routine)
Bowie	United States	Record high maximum temperature	39.4 C (102.9 F)	31 of 100 (Routine)
Bowie	United States	Record high minimum temperature	24.4 C (75.9 F)	31 of 100 (Routine)
Graham	United States	Record high maximum temperature	40.0 C (104.0 F)	31 of 100 (Routine)
New Braunfels	United States	Record high minimum temperature	24.4 C (75.9 F)	31 of 100 (Routine)
San Saba	United States	Record high maximum temperature	37.2 C (99.0 F)	31 of 100 (Routine)

Counts by Type and Timescale

870 records

Records set or tied on 30 September 1977 by type: Highest daily maximum 200, Lowest daily maximum 53, Highest daily minimum 194, Lowest daily minimum 54, Heaviest daily rainfall 367, Heaviest daily snowfall 2.

Records on 30 September 1977 by type
Record type	Records
Highest daily maximum	200
Lowest daily maximum	53
Highest daily minimum	194
Lowest daily minimum	54
Heaviest daily rainfall	367
Heaviest daily snowfall	2
Deepest snow cover	0

Records on 30 September 1977 by timescale: all-time 1, monthly 19, daily 850.

How Much Records Were Beaten By

718 broken records

Margins by which the 718 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 55.4. Ties are not counted.

Top 20 by Significance

30 September 1977

Top 20 records on 30 September 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 September 1977	Big Sandy, US	daily rain	28.4 mm (1.1 in)	25.9 mm (1.0 in)	27 years	53 of 100 (Notable)
30 September 1977	Broadus, US	daily rain	30.2 mm (1.2 in)	20.0 mm (0.8 in)	54 years	53 of 100 (Notable)
30 September 1977	Foremost, CA	daily rain	25.7 mm (1.0 in)	20.4 mm (0.8 in)	52 years	51 of 100 (Notable)
30 September 1977	Manhattan, US	daily rain	26.2 mm (1.0 in)	21.1 mm (0.8 in)	10 years	50 of 100 (Notable)
30 September 1977	Sioux Falls, US	daily rain	68.8 mm (2.7 in)	48.2 mm (1.9 in)	30 years	50 of 100 (Notable)
30 September 1977	Crane Nsa, US	daily rain	82.8 mm (3.3 in)	55.4 mm (2.2 in)	22 years	49 of 100 (Notable)
30 September 1977	Dwingelo, NL	daily rain	28.6 mm (1.1 in)	12.0 mm (0.5 in)	66 years	44 of 100 (Notable)
30 September 1977	Winner, US	daily rain	29.7 mm (1.2 in)	19.5 mm (0.8 in)	51 years	44 of 100 (Notable)
30 September 1977	Canistota 2 N, US	daily rain	63.0 mm (2.5 in)	47.5 mm (1.9 in)	12 years	43 of 100 (Notable)
30 September 1977	Astrakan, RU	daily low min	-0.5 C (31.1 F)	2.0 C (3.6 F)	95 years	42 of 100 (Notable)
30 September 1977	Tomta, SE	daily rain	32.5 mm (1.3 in)	24.2 mm (1.0 in)	12 years	42 of 100 (Notable)
30 September 1977	Buzau, RO	monthly low min	-2.0 C (28.4 F)	1.0 C (1.8 F)	71 years	41 of 100 (Notable)
30 September 1977	Virginia City, US	daily snowfall	15.2 cm (6.0 in)	5.0 cm (2.0 in)	83 years	41 of 100 (Notable)
30 September 1977	Ennis, US	daily rain	30.7 mm (1.2 in)	15.2 mm (0.6 in)	28 years	40 of 100 (Notable)
30 September 1977	Anadarko 3 E, US	daily high max	40.0 C (104.0 F)	4.4 C (7.9 F)	80 years	40 of 100 (Notable)
30 September 1977	Bolivar Wtr Wks, US	daily rain	57.4 mm (2.3 in)	17.5 mm (0.7 in)	78 years	40 of 100 (Notable)
30 September 1977	Flatwillow 4 ENE, US	daily rain	25.4 mm (1.0 in)	10.2 mm (0.4 in)	54 years	39 of 100 (Notable)
30 September 1977	Mullen 3S, US	daily rain	41.9 mm (1.6 in)	10.1 mm (0.4 in)	72 years	39 of 100 (Notable)
30 September 1977	Purdum, US	daily rain	41.1 mm (1.6 in)	10.6 mm (0.4 in)	72 years	39 of 100 (Notable)
30 September 1977	Bom Jesus da Lapa, BR	daily rain	32.0 mm (1.3 in)	23.0 mm (0.9 in)	0 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

1806 to 1977

Records set or tied on this calendar date in each year from 1806 to 1977. 1977 had 870 records.

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

Records on 09-30 in each year
Year	Records
1806	1
1813	1
1817	1
1819	2
1834	1
1841	1
1842	1
1847	1
1853	1
1854	1
1855	1
1861	1
1862	1
1866	1
1868	2
1869	3
1870	1
1874	1
1877	1
1878	1
1881	5
1883	2
1885	1
1886	3
1887	1
1888	4
1889	1
1892	2
1893	3
1894	8
1895	5
1896	2
1897	3
1898	3
1899	12
1900	4
1901	11
1902	7
1903	9
1904	14
1905	25
1906	14
1907	16
1908	18
1909	10
1910	5
1911	47
1912	47
1913	10
1914	33
1915	84
1916	209
1917	19
1918	45
1919	28
1920	71
1921	61
1922	71
1923	183
1924	243
1925	211
1926	194
1927	486
1928	560
1929	181
1930	110
1931	225
1932	363
1933	437
1934	398
1935	209
1936	432
1937	417
1938	428
1939	371
1940	316
1941	482
1942	405
1943	404
1944	369
1945	889
1946	320
1947	433
1948	267
1949	366
1950	731
1951	597
1952	504
1953	1,136
1954	1,059
1955	406
1956	350
1957	663
1958	442
1959	1,159
1960	161
1961	618
1962	202
1963	818
1964	332
1965	459
1966	592
1967	859
1968	449
1969	465
1970	334
1971	1,359
1972	676
1973	407
1974	742
1975	686
1976	775
1977	870
1978	399
1979	479
1980	832
1981	688
1982	806
1983	1,102
1984	1,267
1985	1,892
1986	1,805
1987	649
1988	453
1989	713
1990	665
1991	949
1992	980
1993	988
1994	816
1995	1,061
1996	1,396
1997	729
1998	1,206
1999	1,144
2000	887
2001	699
2002	677
2003	1,079
2004	573
2005	761
2006	617
2007	841
2008	585
2009	826
2010	1,059
2011	1,258
2012	637
2013	634
2014	529
2015	997
2016	746
2017	404
2018	717
2019	2,192
2020	554
2021	823
2022	563
2023	1,012
2024	948
2025	559
2026	529

Download the Data

Data for records on 1977-09-30: 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 10	630
10 to 20	65
20 to 30	17
30 to 40	2
40 to 50	2
50 to 60	2