Weather Records on 17 August 1940

341 weather records were set or tied worldwide on 17 August 1940. Highest significance: Manpur(Tappa), IN.

Key Facts for 17 August 1940

On 17 August 1940, 341 weather records were set or tied at long-record stations worldwide.
192 were record highs and 41 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 4 monthly and 337 daily.
Manpur(Tappa) set a daily record precipitation of 165.4 mm (6.5 in) on 17 August 1940.
Across 162 earlier years (1797 to 2026) the same calendar date averaged 475 records.

Record Map

341 stations

341 station records on 17 August 1940 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 August 1940: highest significance records shown on the map
Station	Country	Type	Value	Significance
Manpur(Tappa)	India	Record daily precipitation	165.4 mm (6.5 in)	51 of 100 (Notable)
Onaway 12 S	United States	Record daily precipitation	50.3 mm (2.0 in)	47 of 100 (Notable)
Przhevalsk	Kyrgyzstan	Record daily precipitation	40.2 mm (1.6 in)	45 of 100 (Notable)
Webbers Falls 5 WSW	United States	Record daily precipitation	94.0 mm (3.7 in)	43 of 100 (Notable)
Bridgeton 1 NE	United States	Record daily precipitation	73.2 mm (2.9 in)	42 of 100 (Notable)
Southport 5 N	United States	Record daily precipitation	60.2 mm (2.4 in)	35 of 100 (Notable)
Haileybury	Canada	Record daily precipitation	56.9 mm (2.2 in)	34 of 100 (Routine)
Coimbra	Portugal	Record high minimum temperature	23.1 C (73.6 F)	33 of 100 (Routine)
Harrison 1 NNW	United States	Record daily precipitation	34.3 mm (1.4 in)	33 of 100 (Routine)
Mio Hydro Plt	United States	Record daily precipitation	49.5 mm (1.9 in)	33 of 100 (Routine)
Pollock	United States	Record daily precipitation	35.6 mm (1.4 in)	33 of 100 (Routine)
Graham	United States	Record daily precipitation	46.2 mm (1.8 in)	32 of 100 (Routine)
Glenwood 3SW	United States	Record daily precipitation	47.2 mm (1.9 in)	31 of 100 (Routine)
Ranpur	India	Record daily precipitation	106.7 mm (4.2 in)	30 of 100 (Routine)
Ekalaka	United States	Record daily precipitation	26.7 mm (1.1 in)	30 of 100 (Routine)
Fergana	Uzbekistan	Record high minimum temperature	21.8 C (71.2 F)	29 of 100 (Routine)
Ft Smith	United States	Record daily precipitation	66.0 mm (2.6 in)	28 of 100 (Routine)
Scotland Neck	United States	Record daily precipitation	34.3 mm (1.4 in)	28 of 100 (Routine)
Orman Dam	United States	Record daily precipitation	32.5 mm (1.3 in)	28 of 100 (Routine)
Burhanpur Sr	India	Record daily precipitation	51.6 mm (2.0 in)	27 of 100 (Routine)
Memphis	United States	Record daily precipitation	48.3 mm (1.9 in)	27 of 100 (Routine)
Mandreal	India	Record daily precipitation	49.5 mm (1.9 in)	26 of 100 (Routine)
Zumbrota	United States	Record daily precipitation	45.2 mm (1.8 in)	26 of 100 (Routine)
Clayoquot	Canada	Record high maximum temperature	28.3 C (82.9 F)	25 of 100 (Routine)
Srimadhopur	India	Record daily precipitation	65.3 mm (2.6 in)	25 of 100 (Routine)
Svyatoy Nos;Cape(Closed)	Russia	Record high minimum temperature	12.2 C (54.0 F)	24 of 100 (Routine)
Canton	United States	Record daily precipitation	54.4 mm (2.1 in)	24 of 100 (Routine)
Marion	United States	Record daily precipitation	35.1 mm (1.4 in)	24 of 100 (Routine)
Clearbrook	United States	Record high maximum temperature	34.4 C (93.9 F)	24 of 100 (Routine)
Nerchinskij Zavod	Russia	Record daily precipitation	30.4 mm (1.2 in)	23 of 100 (Routine)
Steffenville	United States	Record daily precipitation	67.3 mm (2.6 in)	23 of 100 (Routine)
Astoria	United States	Record high maximum temperature	35.6 C (96.1 F)	23 of 100 (Routine)
Paris	Canada	Record high minimum temperature	22.8 C (73.0 F)	22 of 100 (Routine)
Berlin-Dahlem	Germany	Record low maximum temperature	15.0 C (59.0 F)	22 of 100 (Routine)
Ajmer	India	Record daily precipitation	43.7 mm (1.7 in)	22 of 100 (Routine)
Kumbhakonam	India	Record daily precipitation	51.1 mm (2.0 in)	22 of 100 (Routine)
Raiford State Prison	United States	Record low minimum temperature	17.8 C (64.0 F)	22 of 100 (Routine)
Klamath Falls 2 SSW	United States	Record high maximum temperature	35.0 C (95.0 F)	22 of 100 (Routine)
Sheboygan	United States	Record daily precipitation	49.3 mm (1.9 in)	22 of 100 (Routine)
Bhimavaram	India	Record daily precipitation	48.3 mm (1.9 in)	21 of 100 (Routine)
Kulgam	India	Record daily precipitation	38.1 mm (1.5 in)	21 of 100 (Routine)
Newton Rigg	United Kingdom	Record low minimum temperature	6.1 C (43.0 F)	21 of 100 (Routine)
Tampa	United States	Record high minimum temperature	25.6 C (78.1 F)	21 of 100 (Routine)
Greensboro	United States	Record high minimum temperature	25.6 C (78.1 F)	21 of 100 (Routine)
Independence	United States	Record daily precipitation	28.2 mm (1.1 in)	21 of 100 (Routine)
Le Roy	United States	Record daily precipitation	40.1 mm (1.6 in)	21 of 100 (Routine)
W Branch 3SE	United States	Record daily precipitation	34.5 mm (1.4 in)	21 of 100 (Routine)
Neosho	United States	Record daily precipitation	64.3 mm (2.5 in)	21 of 100 (Routine)
Yonna	United States	Record high maximum temperature	37.8 C (100.0 F)	21 of 100 (Routine)
Luling	United States	Record high minimum temperature	26.7 C (80.1 F)	21 of 100 (Routine)
Aberdeen	United States	Record high maximum temperature	35.0 C (95.0 F)	21 of 100 (Routine)
Portland Rfc City	United States	Record high maximum temperature	37.2 C (99.0 F)	21 of 100 (Routine)
Lochinvar	Australia	Record daily precipitation	20.3 mm (0.8 in)	20 of 100 (Routine)
Brownwood 2NE	United States	Record daily precipitation	15.2 mm (0.6 in)	20 of 100 (Routine)
Oracle	United States	Record high maximum temperature	36.1 C (97.0 F)	20 of 100 (Routine)
Glenwood Spgs #2	United States	Record high minimum temperature	16.1 C (61.0 F)	20 of 100 (Routine)
Tallahassee	United States	Record high minimum temperature	25.6 C (78.1 F)	20 of 100 (Routine)
Mauzy	United States	Record high maximum temperature	36.7 C (98.1 F)	20 of 100 (Routine)
Tarboro 1 S	United States	Record daily precipitation	61.7 mm (2.4 in)	20 of 100 (Routine)
Vancouver 4 NNE	United States	Record high maximum temperature	38.9 C (102.0 F)	20 of 100 (Routine)

Counts by Type and Timescale

341 records

Records set or tied on 17 August 1940 by type: Highest daily maximum 117, Lowest daily maximum 22, Highest daily minimum 75, Lowest daily minimum 19, Heaviest daily rainfall 108.

Records on 17 August 1940 by type
Record type	Records
Highest daily maximum	117
Lowest daily maximum	22
Highest daily minimum	75
Lowest daily minimum	19
Heaviest daily rainfall	108
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 17 August 1940 by timescale: all-time 0, monthly 4, daily 337.

How Much Records Were Beaten By

257 broken records

Margins by which the 257 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 78.5. Ties are not counted.

Top 20 by Significance

17 August 1940

Top 20 records on 17 August 1940 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 August 1940	Manpur(Tappa), IN	daily rain	165.4 mm (6.5 in)	78.5 mm (3.1 in)	24 years	51 of 100 (Notable)
17 August 1940	Onaway 12 S, US	daily rain	50.3 mm (2.0 in)	36.3 mm (1.4 in)	19 years	47 of 100 (Notable)
17 August 1940	Przhevalsk, KG	daily rain	40.2 mm (1.6 in)	26.9 mm (1.1 in)	2 years	45 of 100 (Notable)
17 August 1940	Webbers Falls 5 WSW, US	daily rain	94.0 mm (3.7 in)	49.5 mm (1.9 in)	37 years	43 of 100 (Notable)
17 August 1940	Bridgeton 1 NE, US	daily rain	73.2 mm (2.9 in)	55.4 mm (2.2 in)	21 years	42 of 100 (Notable)
17 August 1940	Southport 5 N, US	daily rain	60.2 mm (2.4 in)	34.3 mm (1.4 in)	44 years	35 of 100 (Notable)
17 August 1940	Haileybury, CA	monthly rain	56.9 mm (2.2 in)	10.9 mm (0.4 in)	22 years	34 of 100 (Routine)
17 August 1940	Coimbra, PT	daily high min	23.1 C (73.6 F)	4.7 C (8.5 F)	27 years	33 of 100 (Routine)
17 August 1940	Harrison 1 NNW, US	daily rain	34.3 mm (1.4 in)	27.7 mm (1.1 in)	28 years	33 of 100 (Routine)
17 August 1940	Mio Hydro Plt, US	daily rain	49.5 mm (1.9 in)	25.6 mm (1.0 in)	8 years	33 of 100 (Routine)
17 August 1940	Pollock, US	daily rain	35.6 mm (1.4 in)	26.5 mm (1.0 in)	9 years	33 of 100 (Routine)
17 August 1940	Graham, US	daily rain	46.2 mm (1.8 in)	37.6 mm (1.5 in)	17 years	32 of 100 (Routine)
17 August 1940	Glenwood 3SW, US	daily rain	47.2 mm (1.9 in)	33.5 mm (1.3 in)	14 years	31 of 100 (Routine)
17 August 1940	Ranpur, IN	daily rain	106.7 mm (4.2 in)	44.5 mm (1.8 in)	14 years	30 of 100 (Routine)
17 August 1940	Ekalaka, US	daily rain	26.7 mm (1.1 in)	18.3 mm (0.7 in)	14 years	30 of 100 (Routine)
17 August 1940	Fergana, UZ	daily high min	21.8 C (71.2 F)	2.2 C (4.0 F)	51 years	29 of 100 (Routine)
17 August 1940	Ft Smith, US	daily rain	66.0 mm (2.6 in)	32.7 mm (1.3 in)	9 years	28 of 100 (Routine)
17 August 1940	Scotland Neck, US	daily rain	34.3 mm (1.4 in)	3.8 mm (0.15 in)	66 years	28 of 100 (Routine)
17 August 1940	Orman Dam, US	daily rain	32.5 mm (1.3 in)	12.7 mm (0.5 in)	28 years	28 of 100 (Routine)
17 August 1940	Burhanpur Sr, IN	daily rain	51.6 mm (2.0 in)	22.4 mm (0.9 in)	26 years	27 of 100 (Routine)

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

1797 to 1940

Records set or tied on this calendar date in each year from 1797 to 1940. 1940 had 341 records.

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

Records on 08-17 in each year
Year	Records
1797	2
1802	2
1820	2
1837	1
1838	2
1841	2
1842	1
1845	2
1853	1
1854	1
1856	1
1857	1
1861	3
1862	1
1867	1
1868	3
1869	1
1872	1
1875	2
1876	5
1879	1
1881	1
1882	1
1883	2
1885	3
1886	1
1888	5
1891	1
1892	3
1893	2
1894	3
1895	2
1896	3
1897	1
1898	5
1899	8
1900	3
1901	14
1902	7
1903	6
1904	2
1905	11
1906	28
1907	9
1908	26
1909	24
1910	17
1911	18
1912	31
1913	79
1914	41
1915	28
1916	33
1917	35
1918	112
1919	37
1920	110
1921	37
1922	169
1923	161
1924	171
1925	130
1926	182
1927	228
1928	131
1929	243
1930	138
1931	302
1932	360
1933	260
1934	377
1935	437
1936	670
1937	726
1938	466
1939	364
1940	341
1941	378
1942	461
1943	743
1944	531
1945	387
1946	433
1947	682
1948	475
1949	371
1950	522
1951	413
1952	470
1953	345
1954	685
1955	465
1956	407
1957	504
1958	519
1959	543
1960	533
1961	998
1962	445
1963	650
1964	410
1965	641
1966	496
1967	679
1968	953
1969	593
1970	467
1971	447
1972	1,044
1973	750
1974	582
1975	612
1976	797
1977	1,216
1978	814
1979	1,464
1980	895
1981	1,112
1982	554
1983	1,574
1984	726
1985	948
1986	916
1987	1,150
1988	1,608
1989	687
1990	949
1991	560
1992	1,813
1993	803
1994	1,038
1995	1,724
1996	752
1997	1,544
1998	1,003
1999	697
2000	994
2001	1,101
2002	1,266
2003	948
2004	1,046
2005	722
2006	814
2007	1,646
2008	1,301
2009	922
2010	1,105
2011	956
2012	1,215
2013	802
2014	997
2015	890
2016	748
2017	544
2018	518
2019	467
2020	1,529
2021	800
2022	1,428
2023	1,032
2024	740
2025	538
2026	535

Download the Data

Data for records on 1940-08-17: 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 2026-10-15. Last revised 15 October 2026 (2026-10-15).

Margin	Records
0 to 10	207
10 to 20	28
20 to 30	10
30 to 40	8
40 to 50	2
50 to 60	1
60 to 70	0
70 to 80	1