Weather Records on 4 August 1940

236 weather records were set or tied worldwide on 4 August 1940. Highest significance: Lafayette Rgnl AP, US.

Key Facts for 4 August 1940

On 4 August 1940, 236 weather records were set or tied at long-record stations worldwide.
91 were record highs and 31 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 5 monthly and 230 daily.
Lafayette Rgnl AP set a monthly record daily precipitation of 142.2 mm (5.6 in) on 4 August 1940.
Across 165 earlier years (1815 to 2026) the same calendar date averaged 443 records.

Record Map

236 stations

236 station records on 4 August 1940 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 4 August 1940: highest significance records shown on the map
Station	Country	Type	Value	Significance
Lafayette Rgnl AP	United States	Record daily precipitation	142.2 mm (5.6 in)	59 of 100 (Notable)
Appleton	United States	Record daily precipitation	40.6 mm (1.6 in)	42 of 100 (Notable)
Black Rock	United States	Record daily precipitation	72.1 mm (2.8 in)	41 of 100 (Notable)
Castlewood	United States	Record daily precipitation	43.7 mm (1.7 in)	37 of 100 (Notable)
Aleksandrovsk-Sahalinskij	Russia	Record daily precipitation	40.4 mm (1.6 in)	36 of 100 (Notable)
Garhwa	India	Record daily precipitation	108.0 mm (4.3 in)	34 of 100 (Routine)
Chattarpur	India	Record daily precipitation	117.6 mm (4.6 in)	34 of 100 (Routine)
Cudgen Plantation	Australia	Record daily precipitation	53.1 mm (2.1 in)	32 of 100 (Routine)
Patan	India	Record daily precipitation	106.2 mm (4.2 in)	30 of 100 (Routine)
Sardarshahar	India	Record daily precipitation	94.0 mm (3.7 in)	30 of 100 (Routine)
Pocahontas 1	United States	Record daily precipitation	45.7 mm (1.8 in)	30 of 100 (Routine)
Hennessey 4 ESE	United States	Record daily precipitation	52.3 mm (2.1 in)	29 of 100 (Routine)
Wichita	United States	Record daily precipitation	34.0 mm (1.3 in)	29 of 100 (Routine)
Nagerutari	India	Record daily precipitation	132.8 mm (5.2 in)	28 of 100 (Routine)
Tijara	India	Record daily precipitation	95.3 mm (3.8 in)	28 of 100 (Routine)
Kustanai	Kazakhstan	Record high minimum temperature	23.5 C (74.3 F)	28 of 100 (Routine)
Astrakan	Russia	Record high maximum temperature	38.2 C (100.8 F)	28 of 100 (Routine)
Borio	India	Record daily precipitation	88.1 mm (3.5 in)	27 of 100 (Routine)
Godda	India	Record daily precipitation	57.9 mm (2.3 in)	26 of 100 (Routine)
Streator 2SE	United States	Record daily precipitation	30.0 mm (1.2 in)	26 of 100 (Routine)
Elkins	United States	Record high minimum temperature	23.3 C (73.9 F)	26 of 100 (Routine)
Edwardsville 2 W	United States	Record daily precipitation	31.2 mm (1.2 in)	25 of 100 (Routine)
Fort Chipewyan	Canada	Record low minimum temperature	-0.6 C (30.9 F)	24 of 100 (Routine)
Parry Sound	Canada	Record daily precipitation	37.6 mm (1.5 in)	24 of 100 (Routine)
Bajramaly	Turkmenistan	Record high minimum temperature	27.6 C (81.7 F)	24 of 100 (Routine)
Flandreau	United States	Record daily precipitation	30.0 mm (1.2 in)	24 of 100 (Routine)
Sambhar	India	Record daily precipitation	89.2 mm (3.5 in)	23 of 100 (Routine)
Schriever	United States	Record high minimum temperature	25.0 C (77.0 F)	23 of 100 (Routine)
Fullerton 1 ESE	United States	Record daily precipitation	27.9 mm (1.1 in)	23 of 100 (Routine)
Ponce 4 E	Puerto Rico [United States]	Record high maximum temperature	35.0 C (95.0 F)	22 of 100 (Routine)
Tuscaloosa Oliver Dam	United States	Record high minimum temperature	27.2 C (81.0 F)	22 of 100 (Routine)
Berne Wwtp	United States	Record daily precipitation	29.2 mm (1.1 in)	22 of 100 (Routine)
Ulysses 3NE	United States	Record daily precipitation	32.3 mm (1.3 in)	22 of 100 (Routine)
Cuero	United States	Record high minimum temperature	27.8 C (82.0 F)	22 of 100 (Routine)
Chatra	India	Record daily precipitation	53.1 mm (2.1 in)	21 of 100 (Routine)
Mandla	India	Record daily precipitation	61.0 mm (2.4 in)	21 of 100 (Routine)
Chirawa	India	Record daily precipitation	56.1 mm (2.2 in)	21 of 100 (Routine)
Alexandria	United States	Record daily precipitation	69.6 mm (2.7 in)	21 of 100 (Routine)
Bosque del Apache	United States	Record daily precipitation	30.5 mm (1.2 in)	21 of 100 (Routine)
Menno	United States	Record daily precipitation	36.6 mm (1.4 in)	21 of 100 (Routine)
Haiku 490	United States	Record high minimum temperature	22.8 C (73.0 F)	21 of 100 (Routine)
Waianae 798	United States	Record high maximum temperature	34.4 C (93.9 F)	21 of 100 (Routine)
Lewistown AP	United States	Record low maximum temperature	17.8 C (64.0 F)	21 of 100 (Routine)
Prince Albert Road (Sar)	South Africa	Record daily precipitation	20.3 mm (0.8 in)	20 of 100 (Routine)
Laingsburg	South Africa	Record daily precipitation	15.2 mm (0.6 in)	20 of 100 (Routine)
Huntsville	Canada	Record daily precipitation	24.9 mm (1.0 in)	20 of 100 (Routine)
Ilulissat (Jakobshavn)	Greenland [Denmark]	Record daily precipitation	20.0 mm (0.8 in)	20 of 100 (Routine)
Mitchell 2 N	United States	Record daily precipitation	23.6 mm (0.9 in)	20 of 100 (Routine)
Matjiesfontein (Sar)	South Africa	Record daily precipitation	19.6 mm (0.8 in)	20 of 100 (Routine)
Murraysburg (Pol)	South Africa	Record daily precipitation	1.8 mm (0.07 in)	20 of 100 (Routine)
Tallebudgera Guineas Creek Roa	Australia	Record daily precipitation	21.3 mm (0.8 in)	20 of 100 (Routine)
Owen Sound	Canada	Record daily precipitation	20.6 mm (0.8 in)	20 of 100 (Routine)
Calitzdorp Pol	South Africa	Record daily precipitation	6.1 mm (0.24 in)	20 of 100 (Routine)
Kamferskraal	South Africa	Record daily precipitation	4.1 mm (0.16 in)	20 of 100 (Routine)
Alexandria	United States	Record daily precipitation	15.2 mm (0.6 in)	20 of 100 (Routine)
Tulloona (Coolanga)	Australia	Record daily precipitation	4.6 mm (0.18 in)	20 of 100 (Routine)
Zerbst	Germany	Record daily precipitation	8.0 mm (0.31 in)	20 of 100 (Routine)
Sherkawan	India	Record daily precipitation	65.5 mm (2.6 in)	20 of 100 (Routine)
Tirumayam	India	Record daily precipitation	35.6 mm (1.4 in)	20 of 100 (Routine)
Ulan-Ude	Russia	Record low minimum temperature	5.4 C (41.7 F)	20 of 100 (Routine)

Counts by Type and Timescale

236 records

Records set or tied on 4 August 1940 by type: Highest daily maximum 39, Lowest daily maximum 12, Highest daily minimum 52, Lowest daily minimum 19, Heaviest daily rainfall 114.

Records on 4 August 1940 by type
Record type	Records
Highest daily maximum	39
Lowest daily maximum	12
Highest daily minimum	52
Lowest daily minimum	19
Heaviest daily rainfall	114
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 4 August 1940 by timescale: all-time 1, monthly 5, daily 230.

How Much Records Were Beaten By

182 broken records

Margins by which the 182 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 66.8. Ties are not counted.

Top 20 by Significance

4 August 1940

Top 20 records on 4 August 1940 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
4 August 1940	Lafayette Rgnl AP, US	monthly rain	142.2 mm (5.6 in)	45.7 mm (1.8 in)	42 years	59 of 100 (Notable)
4 August 1940	Appleton, US	daily rain	40.6 mm (1.6 in)	31.7 mm (1.2 in)	24 years	42 of 100 (Notable)
4 August 1940	Black Rock, US	daily rain	72.1 mm (2.8 in)	42.1 mm (1.7 in)	32 years	41 of 100 (Notable)
4 August 1940	Castlewood, US	daily rain	43.7 mm (1.7 in)	28.0 mm (1.1 in)	34 years	37 of 100 (Notable)
4 August 1940	Aleksandrovsk-Sahalinskij, RU	daily rain	40.4 mm (1.6 in)	22.4 mm (0.9 in)	14 years	36 of 100 (Notable)
4 August 1940	Garhwa, IN	daily rain	108.0 mm (4.3 in)	63.5 mm (2.5 in)	18 years	34 of 100 (Routine)
4 August 1940	Chattarpur, IN	daily rain	117.6 mm (4.6 in)	66.3 mm (2.6 in)	17 years	34 of 100 (Routine)
4 August 1940	Cudgen Plantation, AU	daily rain	53.1 mm (2.1 in)	33.3 mm (1.3 in)	12 years	32 of 100 (Routine)
4 August 1940	Patan, IN	daily rain	106.2 mm (4.2 in)	66.8 mm (2.6 in)	18 years	30 of 100 (Routine)
4 August 1940	Sardarshahar, IN	daily rain	94.0 mm (3.7 in)	43.2 mm (1.7 in)	23 years	30 of 100 (Routine)
4 August 1940	Pocahontas 1, US	daily rain	45.7 mm (1.8 in)	26.1 mm (1.0 in)	32 years	30 of 100 (Routine)
4 August 1940	Hennessey 4 ESE, US	daily rain	52.3 mm (2.1 in)	48.5 mm (1.9 in)	1 year	29 of 100 (Routine)
4 August 1940	Wichita, US	daily rain	34.0 mm (1.3 in)	24.9 mm (1.0 in)	33 years	29 of 100 (Routine)
4 August 1940	Nagerutari, IN	daily rain	132.8 mm (5.2 in)	41.4 mm (1.6 in)	18 years	28 of 100 (Routine)
4 August 1940	Tijara, IN	daily rain	95.3 mm (3.8 in)	38.9 mm (1.5 in)	19 years	28 of 100 (Routine)
4 August 1940	Kustanai, KZ	all-time high min	23.5 C (74.3 F)	0.2 C (0.4 F)	17 years	28 of 100 (Routine)
4 August 1940	Astrakan, RU	monthly high max	38.2 C (100.8 F)	0.2 C (0.4 F)	42 years	28 of 100 (Routine)
4 August 1940	Borio, IN	daily rain	88.1 mm (3.5 in)	35.3 mm (1.4 in)	23 years	27 of 100 (Routine)
4 August 1940	Godda, IN	daily rain	57.9 mm (2.3 in)	27.4 mm (1.1 in)	21 years	26 of 100 (Routine)
4 August 1940	Streator 2SE, US	daily rain	30.0 mm (1.2 in)	16.3 mm (0.6 in)	34 years	26 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

1815 to 1940

Records set or tied on this calendar date in each year from 1815 to 1940. 1940 had 236 records.

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

Records on 08-04 in each year
Year	Records
1815	1
1827	1
1830	2
1833	1
1835	1
1843	1
1846	1
1847	1
1848	1
1857	1
1859	2
1860	2
1863	1
1865	3
1867	1
1868	1
1870	1
1871	1
1872	2
1874	3
1875	1
1878	3
1879	1
1881	2
1882	1
1883	1
1885	3
1886	1
1887	3
1888	4
1889	2
1890	1
1891	2
1893	2
1894	1
1895	3
1896	4
1897	3
1898	1
1899	7
1900	6
1902	4
1903	18
1904	11
1905	19
1906	14
1907	20
1908	31
1909	27
1910	17
1911	23
1912	51
1913	15
1914	33
1915	85
1916	97
1917	29
1918	95
1919	34
1920	79
1921	67
1922	68
1923	146
1924	132
1925	77
1926	334
1927	136
1928	352
1929	224
1930	698
1931	371
1932	258
1933	347
1934	521
1935	367
1936	719
1937	258
1938	489
1939	433
1940	236
1941	383
1942	303
1943	468
1944	662
1945	355
1946	265
1947	845
1948	558
1949	421
1950	666
1951	680
1952	465
1953	1,017
1954	426
1955	624
1956	437
1957	343
1958	533
1959	303
1960	331
1961	745
1962	470
1963	438
1964	885
1965	409
1966	552
1967	428
1968	280
1969	638
1970	415
1971	813
1972	773
1973	748
1974	1,040
1975	772
1976	801
1977	599
1978	1,051
1979	510
1980	998
1981	636
1982	703
1983	920
1984	722
1985	634
1986	905
1987	892
1988	1,204
1989	738
1990	1,013
1991	769
1992	754
1993	1,046
1994	1,265
1995	1,117
1996	1,143
1997	891
1998	1,423
1999	762
2000	840
2001	1,087
2002	928
2003	1,309
2004	968
2005	1,246
2006	1,131
2007	685
2008	883
2009	681
2010	1,665
2011	1,536
2012	738
2013	452
2014	980
2015	505
2016	732
2017	1,134
2018	760
2019	499
2020	778
2021	691
2022	1,185
2023	1,150
2024	809
2025	840
2026	1,044

Download the Data

Data for records on 1940-08-04: 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	131
10 to 20	24
20 to 30	12
30 to 40	7
40 to 50	5
50 to 60	0
60 to 70	3