Weather Records on 21 October 1939

491 weather records were set or tied worldwide on 21 October 1939. Highest significance: Low Isles Lighthouse, AU.

Key Facts for 21 October 1939

On 21 October 1939, 491 weather records were set or tied at long-record stations worldwide.
324 were record highs and 4 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 11 monthly and 478 daily.
Low Isles Lighthouse set a daily record precipitation of 66.0 mm (2.6 in) on 21 October 1939.
Across 167 earlier years (1795 to 2025) the same calendar date averaged 419 records.

Record Map

491 stations

491 station records on 21 October 1939 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 October 1939: highest significance records shown on the map
Station	Country	Type	Value	Significance
Low Isles Lighthouse	Australia	Record daily precipitation	66.0 mm (2.6 in)	53 of 100 (Notable)
Narsapur	India	Record daily precipitation	179.1 mm (7.1 in)	46 of 100 (Notable)
Chinaganjam	India	Record daily precipitation	200.7 mm (7.9 in)	46 of 100 (Notable)
Vijayawada	India	Record daily precipitation	81.3 mm (3.2 in)	45 of 100 (Notable)
Tenali	India	Record daily precipitation	170.2 mm (6.7 in)	44 of 100 (Notable)
Addanki	India	Record daily precipitation	181.9 mm (7.2 in)	44 of 100 (Notable)
Guntur	India	Record daily precipitation	125.7 mm (4.9 in)	43 of 100 (Notable)
Thomas River (Sar)	South Africa	Record daily precipitation	34.3 mm (1.4 in)	43 of 100 (Notable)
Prairie Post Office	Australia	Record daily precipitation	30.7 mm (1.2 in)	42 of 100 (Notable)
Gudivada	India	Record daily precipitation	114.3 mm (4.5 in)	42 of 100 (Notable)
Kanuparthi	India	Record daily precipitation	287.0 mm (11.3 in)	41 of 100 (Notable)
Sathenapalli	India	Record daily precipitation	82.6 mm (3.3 in)	41 of 100 (Notable)
Santaravur	India	Record daily precipitation	205.7 mm (8.1 in)	41 of 100 (Notable)
Cameron Downs	Australia	Record daily precipitation	44.5 mm (1.8 in)	40 of 100 (Notable)
Mangalgiri	India	Record daily precipitation	106.2 mm (4.2 in)	39 of 100 (Notable)
Kharsawan	India	Record daily precipitation	42.7 mm (1.7 in)	38 of 100 (Notable)
Trenton 2	United States	Record high maximum temperature	25.6 C (78.1 F)	38 of 100 (Notable)
Torrens Creek Post Office	Australia	Record daily precipitation	25.9 mm (1.0 in)	37 of 100 (Notable)
Coringa(Corinza)	India	Record daily precipitation	156.0 mm (6.1 in)	37 of 100 (Notable)
Sampagaon-Bailh	India	Record daily precipitation	42.7 mm (1.7 in)	37 of 100 (Notable)
Uanda	Australia	Record daily precipitation	35.1 mm (1.4 in)	36 of 100 (Notable)
Windorah Post Office	Australia	Record daily precipitation	53.6 mm (2.1 in)	36 of 100 (Notable)
Stamford Station	Australia	Record daily precipitation	50.8 mm (2.0 in)	35 of 100 (Notable)
Tadepalligudem	India	Record daily precipitation	96.0 mm (3.8 in)	34 of 100 (Routine)
Broken Hill (Glen Lyon)	Australia	Record daily precipitation	53.3 mm (2.1 in)	33 of 100 (Routine)
Kothapeta	India	Record daily precipitation	113.0 mm (4.4 in)	33 of 100 (Routine)
Coorabulka	Australia	Record daily precipitation	34.3 mm (1.4 in)	32 of 100 (Routine)
Ponnur(Ponnuru)	India	Record daily precipitation	129.3 mm (5.1 in)	32 of 100 (Routine)
Beaconsfield	Australia	Record daily precipitation	40.6 mm (1.6 in)	31 of 100 (Routine)
Balpool (Nyang)	Australia	Record daily precipitation	60.7 mm (2.4 in)	31 of 100 (Routine)
Bapatla	India	Record daily precipitation	143.0 mm (5.6 in)	31 of 100 (Routine)
Jaggiayapet	India	Record daily precipitation	66.0 mm (2.6 in)	31 of 100 (Routine)
Kelowna	Canada	Record high maximum temperature	23.3 C (73.9 F)	29 of 100 (Routine)
Bhimavaram	India	Record daily precipitation	168.9 mm (6.6 in)	29 of 100 (Routine)
Venukonda	India	Record daily precipitation	86.4 mm (3.4 in)	28 of 100 (Routine)
Amalapuram	India	Record daily precipitation	131.6 mm (5.2 in)	27 of 100 (Routine)
Evesham Station	Australia	Record daily precipitation	33.0 mm (1.3 in)	26 of 100 (Routine)
Belle Isle	Canada	Record low minimum temperature	-6.7 C (19.9 F)	26 of 100 (Routine)
Tanuku	India	Record daily precipitation	103.6 mm (4.1 in)	26 of 100 (Routine)
Port Douglas - Warner St	Australia	Record daily precipitation	25.4 mm (1.0 in)	25 of 100 (Routine)
Alamur(Alamar)	India	Record daily precipitation	203.2 mm (8.0 in)	25 of 100 (Routine)
Ramachandrapuram	India	Record daily precipitation	134.1 mm (5.3 in)	25 of 100 (Routine)
Haliyal	India	Record daily precipitation	59.7 mm (2.4 in)	25 of 100 (Routine)
Kalispell Glacier AP	United States	Record high minimum temperature	11.1 C (52.0 F)	25 of 100 (Routine)
Powell	United States	Record high minimum temperature	13.3 C (55.9 F)	25 of 100 (Routine)
Kakinada	India	Record daily precipitation	81.5 mm (3.2 in)	24 of 100 (Routine)
Chintalapudi	India	Record daily precipitation	48.5 mm (1.9 in)	24 of 100 (Routine)
Pakala	India	Record daily precipitation	217.2 mm (8.6 in)	24 of 100 (Routine)
Spokane Intl AP	United States	Record high minimum temperature	11.1 C (52.0 F)	24 of 100 (Routine)
Big Creek	Canada	Record high minimum temperature	3.3 C (37.9 F)	23 of 100 (Routine)
Willapa Harbor	United States	Record high minimum temperature	13.3 C (55.9 F)	23 of 100 (Routine)
Penticton	Canada	Record high minimum temperature	13.3 C (55.9 F)	22 of 100 (Routine)
Karmala	India	Record daily precipitation	31.2 mm (1.2 in)	22 of 100 (Routine)
Redding Fire STN 2	United States	Record high minimum temperature	20.6 C (69.1 F)	22 of 100 (Routine)
Hughenden Post Office	Australia	Record daily precipitation	27.2 mm (1.1 in)	21 of 100 (Routine)
Princeton	Canada	Record high minimum temperature	10.6 C (51.1 F)	21 of 100 (Routine)
Vernon Coldstream Ranch	Canada	Record high maximum temperature	23.9 C (75.0 F)	21 of 100 (Routine)
Rapalle	India	Record daily precipitation	95.3 mm (3.8 in)	21 of 100 (Routine)
Sendamangalam	India	Record daily precipitation	46.0 mm (1.8 in)	21 of 100 (Routine)
San Jacinto	United States	Record high minimum temperature	15.6 C (60.1 F)	21 of 100 (Routine)

Counts by Type and Timescale

491 records

Records set or tied on 21 October 1939 by type: Highest daily maximum 205, Lowest daily maximum 3, Highest daily minimum 119, Lowest daily minimum 1, Heaviest daily rainfall 161, Heaviest daily snowfall 2.

Records on 21 October 1939 by type
Record type	Records
Highest daily maximum	205
Lowest daily maximum	3
Highest daily minimum	119
Lowest daily minimum	1
Heaviest daily rainfall	161
Heaviest daily snowfall	2
Deepest snow cover	0

Records on 21 October 1939 by timescale: all-time 2, monthly 11, daily 478.

How Much Records Were Beaten By

378 broken records

Margins by which the 378 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 136.7. Ties are not counted.

Top 20 by Significance

21 October 1939

Top 20 records on 21 October 1939 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 October 1939	Low Isles Lighthouse, AU	daily rain	66.0 mm (2.6 in)	56.9 mm (2.2 in)	29 years	53 of 100 (Notable)
21 October 1939	Narsapur, IN	daily rain	179.1 mm (7.1 in)	121.9 mm (4.8 in)	10 years	46 of 100 (Notable)
21 October 1939	Chinaganjam, IN	daily rain	200.7 mm (7.9 in)	136.7 mm (5.4 in)	10 years	46 of 100 (Notable)
21 October 1939	Vijayawada, IN	daily rain	81.3 mm (3.2 in)	63.5 mm (2.5 in)	36 years	45 of 100 (Notable)
21 October 1939	Tenali, IN	daily rain	170.2 mm (6.7 in)	125.0 mm (4.9 in)	4 years	44 of 100 (Notable)
21 October 1939	Addanki, IN	monthly rain	181.9 mm (7.2 in)	53.1 mm (2.1 in)	28 years	44 of 100 (Notable)
21 October 1939	Guntur, IN	daily rain	125.7 mm (4.9 in)	86.3 mm (3.4 in)	2 years	43 of 100 (Notable)
21 October 1939	Thomas River (Sar), ZA	daily rain	34.3 mm (1.4 in)	27.2 mm (1.1 in)	34 years	43 of 100 (Notable)
21 October 1939	Prairie Post Office, AU	daily rain	30.7 mm (1.2 in)	30.4 mm (1.2 in)	26 years	42 of 100 (Notable)
21 October 1939	Gudivada, IN	daily rain	114.3 mm (4.5 in)	88.4 mm (3.5 in)	21 years	42 of 100 (Notable)
21 October 1939	Kanuparthi, IN	all-time rain	287.0 mm (11.3 in)	27.9 mm (1.1 in)	35 years	41 of 100 (Notable)
21 October 1939	Sathenapalli, IN	daily rain	82.6 mm (3.3 in)	53.4 mm (2.1 in)	33 years	41 of 100 (Notable)
21 October 1939	Santaravur, IN	all-time rain	205.7 mm (8.1 in)	38.6 mm (1.5 in)	11 years	41 of 100 (Notable)
21 October 1939	Cameron Downs, AU	daily rain	44.5 mm (1.8 in)	37.6 mm (1.5 in)	18 years	40 of 100 (Notable)
21 October 1939	Mangalgiri, IN	daily rain	106.2 mm (4.2 in)	73.9 mm (2.9 in)	9 years	39 of 100 (Notable)
21 October 1939	Kharsawan, IN	daily rain	42.7 mm (1.7 in)	42.7 mm (1.7 in)	36 years	38 of 100 (Notable)
21 October 1939	Trenton 2, US	daily high max	25.6 C (78.1 F)	4.5 C (8.1 F)	72 years	38 of 100 (Notable)
21 October 1939	Torrens Creek Post Office, AU	daily rain	25.9 mm (1.0 in)	25.9 mm (1.0 in)	45 years	37 of 100 (Notable)
21 October 1939	Coringa(Corinza), IN	daily rain	156.0 mm (6.1 in)	107.7 mm (4.2 in)	21 years	37 of 100 (Notable)
21 October 1939	Sampagaon-Bailh, IN	daily rain	42.7 mm (1.7 in)	35.8 mm (1.4 in)	30 years	37 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

1795 to 1939

Records set or tied on this calendar date in each year from 1795 to 1939. 1939 had 491 records.

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

Records on 10-21 in each year
Year	Records
1795	1
1802	2
1805	1
1808	1
1810	1
1834	1
1835	1
1840	1
1845	1
1847	1
1850	1
1851	2
1854	1
1859	1
1863	1
1864	1
1866	3
1867	1
1868	3
1869	2
1871	1
1872	1
1873	1
1874	1
1876	4
1877	2
1878	1
1880	3
1881	1
1883	1
1886	1
1888	2
1889	2
1890	3
1891	6
1892	6
1893	1
1894	1
1895	2
1896	5
1898	6
1899	3
1900	2
1901	9
1902	2
1903	3
1904	30
1905	15
1906	11
1907	35
1908	35
1909	19
1910	21
1911	10
1912	18
1913	59
1914	35
1915	43
1916	70
1917	208
1918	18
1919	102
1920	149
1921	58
1922	78
1923	81
1924	389
1925	150
1926	77
1927	187
1928	78
1929	200
1930	492
1931	217
1932	165
1933	733
1934	407
1935	707
1936	407
1937	132
1938	121
1939	491
1940	537
1941	644
1942	258
1943	421
1944	367
1945	538
1946	297
1947	977
1948	266
1949	1,015
1950	438
1951	382
1952	848
1953	1,579
1954	279
1955	481
1956	276
1957	511
1958	322
1959	410
1960	408
1961	553
1962	359
1963	725
1964	457
1965	465
1966	425
1967	472
1968	174
1969	881
1970	548
1971	498
1972	813
1973	464
1974	866
1975	509
1976	1,467
1977	451
1978	616
1979	1,958
1980	378
1981	667
1982	870
1983	786
1984	1,872
1985	776
1986	814
1987	852
1988	696
1989	1,668
1990	807
1991	877
1992	1,095
1993	845
1994	670
1995	1,120
1996	1,581
1997	915
1998	711
1999	688
2000	771
2001	610
2002	1,241
2003	2,066
2004	1,674
2005	949
2006	1,057
2007	916
2008	610
2009	713
2010	710
2011	662
2012	703
2013	440
2014	716
2015	493
2016	734
2017	750
2018	440
2019	757
2020	1,135
2021	574
2022	629
2023	890
2024	1,138
2025	364

Download the Data

Data for records on 1939-10-21: 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Margin	Records
0 to 20	327
20 to 40	29
40 to 60	10
60 to 80	6
80 to 100	2
100 to 120	1
120 to 140	3