Weather Records on 18 August 1940

434 weather records were set or tied worldwide on 18 August 1940. Highest significance: Pine River 3 NE, US.

Key Facts for 18 August 1940

On 18 August 1940, 434 weather records were set or tied at long-record stations worldwide.
185 were record highs and 76 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 10 monthly and 423 daily.
Pine River 3 NE set a daily record precipitation of 87.6 mm (3.4 in) on 18 August 1940.
Across 171 earlier years (1797 to 2026) the same calendar date averaged 441 records.

Record Map

434 stations

434 station records on 18 August 1940 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 August 1940: highest significance records shown on the map
Station	Country	Type	Value	Significance
Pine River 3 NE	United States	Record daily precipitation	87.6 mm (3.4 in)	51 of 100 (Notable)
Collingwood	Canada	Record daily precipitation	48.3 mm (1.9 in)	47 of 100 (Notable)
Kukicherra	India	Record daily precipitation	139.4 mm (5.5 in)	46 of 100 (Notable)
Wollong	Australia	Record daily precipitation	36.8 mm (1.4 in)	44 of 100 (Notable)
Ridgetown	Canada	Record daily precipitation	43.4 mm (1.7 in)	44 of 100 (Notable)
Narsapur	India	Record daily precipitation	165.9 mm (6.5 in)	44 of 100 (Notable)
Pontiac	United States	Record daily precipitation	68.6 mm (2.7 in)	44 of 100 (Notable)
Medowie Post Office	Australia	Record daily precipitation	43.9 mm (1.7 in)	43 of 100 (Notable)
Hewitt	United States	Record daily precipitation	68.1 mm (2.7 in)	42 of 100 (Notable)
Llano	United States	Record daily precipitation	63.5 mm (2.5 in)	40 of 100 (Notable)
Steveston	Canada	Record high minimum temperature	21.7 C (71.1 F)	39 of 100 (Notable)
Stratford	Canada	Record daily precipitation	78.7 mm (3.1 in)	38 of 100 (Notable)
Dullabcherra	India	Record daily precipitation	135.9 mm (5.4 in)	38 of 100 (Notable)
Dialville 2 W	United States	Record daily precipitation	69.6 mm (2.7 in)	38 of 100 (Notable)
Pine Brush	Australia	Record daily precipitation	31.0 mm (1.2 in)	37 of 100 (Notable)
Emsdale	Canada	Record daily precipitation	53.3 mm (2.1 in)	37 of 100 (Notable)
Junction 4SSW	United States	Record daily precipitation	48.8 mm (1.9 in)	36 of 100 (Notable)
Gannavaram	India	Record daily precipitation	78.7 mm (3.1 in)	35 of 100 (Notable)
Bhimavaram	India	Record daily precipitation	88.9 mm (3.5 in)	34 of 100 (Routine)
Winnemucca AP	United States	Record high minimum temperature	21.1 C (70.0 F)	34 of 100 (Routine)
Cockle Creek (Pasminco Metals)	Australia	Record daily precipitation	29.7 mm (1.2 in)	33 of 100 (Routine)
Lucan	Canada	Record daily precipitation	35.6 mm (1.4 in)	33 of 100 (Routine)
Pendraka	India	Record daily precipitation	56.1 mm (2.2 in)	31 of 100 (Routine)
Vijayawada	India	Record daily precipitation	71.1 mm (2.8 in)	30 of 100 (Routine)
Hancock Exp Farm	United States	Record daily precipitation	100.3 mm (3.9 in)	30 of 100 (Routine)
Tiruvur(Tiruvvru)	India	Record daily precipitation	78.7 mm (3.1 in)	29 of 100 (Routine)
Grand Canyon HQ	United States	Record daily precipitation	27.2 mm (1.1 in)	29 of 100 (Routine)
Minonk	United States	Record daily precipitation	46.2 mm (1.8 in)	29 of 100 (Routine)
Oberlin	United States	Record daily precipitation	86.4 mm (3.4 in)	29 of 100 (Routine)
Chemnitz	Germany	Record low minimum temperature	3.5 C (38.3 F)	28 of 100 (Routine)
Ellore	India	Record daily precipitation	47.5 mm (1.9 in)	28 of 100 (Routine)
Arkansas City	United States	Record daily precipitation	35.8 mm (1.4 in)	28 of 100 (Routine)
Aurora Water	United States	Record daily precipitation	26.7 mm (1.1 in)	28 of 100 (Routine)
Unionville	United States	Record daily precipitation	66.8 mm (2.6 in)	28 of 100 (Routine)
Mather 3 NW	United States	Record daily precipitation	44.7 mm (1.8 in)	28 of 100 (Routine)
Gosford State Nursery	Australia	Record daily precipitation	26.7 mm (1.1 in)	27 of 100 (Routine)
Mistassini Post	Canada	Record daily precipitation	34.3 mm (1.4 in)	27 of 100 (Routine)
Leipzig-Holzhausen	Germany	Record low minimum temperature	8.4 C (47.1 F)	27 of 100 (Routine)
Chintalapudi	India	Record daily precipitation	57.7 mm (2.3 in)	27 of 100 (Routine)
Gadhchiroli	India	Record daily precipitation	145.8 mm (5.7 in)	27 of 100 (Routine)
Firozabad	India	Record daily precipitation	59.7 mm (2.4 in)	27 of 100 (Routine)
Roorkee	India	Record daily precipitation	129.5 mm (5.1 in)	27 of 100 (Routine)
Havana	United States	Record daily precipitation	67.6 mm (2.7 in)	27 of 100 (Routine)
E Tawas	United States	Record daily precipitation	59.4 mm (2.3 in)	27 of 100 (Routine)
Tiffin	United States	Record daily precipitation	70.4 mm (2.8 in)	26 of 100 (Routine)
Simcoe	Canada	Record high minimum temperature	20.6 C (69.1 F)	25 of 100 (Routine)
Nandigama	India	Record daily precipitation	64.8 mm (2.6 in)	25 of 100 (Routine)
Armori	India	Record daily precipitation	185.4 mm (7.3 in)	25 of 100 (Routine)
Mio Hydro Plt	United States	Record daily precipitation	36.3 mm (1.4 in)	25 of 100 (Routine)
Jefferson City Wtp	United States	Record daily precipitation	55.9 mm (2.2 in)	25 of 100 (Routine)
Haileybury	Canada	Record daily precipitation	64.8 mm (2.6 in)	24 of 100 (Routine)
Pembroke Eddy Match	Canada	Record high minimum temperature	18.9 C (66.0 F)	24 of 100 (Routine)
Tadepalligudem	India	Record daily precipitation	45.5 mm (1.8 in)	24 of 100 (Routine)
Jaggiayapet	India	Record daily precipitation	43.2 mm (1.7 in)	24 of 100 (Routine)
Manginapudi	India	Record daily precipitation	44.7 mm (1.8 in)	24 of 100 (Routine)
Padwa	India	Record daily precipitation	58.4 mm (2.3 in)	24 of 100 (Routine)
Harrisville	United States	Record daily precipitation	26.7 mm (1.1 in)	24 of 100 (Routine)
Fulton	United States	Record daily precipitation	36.8 mm (1.4 in)	24 of 100 (Routine)
Cottonwood 2 E	United States	Record low minimum temperature	1.7 C (35.1 F)	24 of 100 (Routine)
Toronto	Canada	Record high minimum temperature	21.7 C (71.1 F)	23 of 100 (Routine)

Counts by Type and Timescale

434 records

Records set or tied on 18 August 1940 by type: Highest daily maximum 75, Lowest daily maximum 41, Highest daily minimum 110, Lowest daily minimum 35, Heaviest daily rainfall 173.

Records on 18 August 1940 by type
Record type	Records
Highest daily maximum	75
Lowest daily maximum	41
Highest daily minimum	110
Lowest daily minimum	35
Heaviest daily rainfall	173
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 18 August 1940 by timescale: all-time 1, monthly 10, daily 423.

How Much Records Were Beaten By

321 broken records

Margins by which the 321 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 69.1. Ties are not counted.

Top 20 by Significance

18 August 1940

Top 20 records on 18 August 1940 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 August 1940	Pine River 3 NE, US	daily rain	87.6 mm (3.4 in)	68.0 mm (2.7 in)	26 years	51 of 100 (Notable)
18 August 1940	Collingwood, CA	daily rain	48.3 mm (1.9 in)	39.4 mm (1.6 in)	21 years	47 of 100 (Notable)
18 August 1940	Kukicherra, IN	daily rain	139.4 mm (5.5 in)	65.0 mm (2.6 in)	26 years	46 of 100 (Notable)
18 August 1940	Wollong, AU	daily rain	36.8 mm (1.4 in)	24.9 mm (1.0 in)	40 years	44 of 100 (Notable)
18 August 1940	Ridgetown, CA	daily rain	43.4 mm (1.7 in)	33.2 mm (1.3 in)	39 years	44 of 100 (Notable)
18 August 1940	Narsapur, IN	monthly rain	165.9 mm (6.5 in)	45.2 mm (1.8 in)	4 years	44 of 100 (Notable)
18 August 1940	Pontiac, US	daily rain	68.6 mm (2.7 in)	40.2 mm (1.6 in)	27 years	44 of 100 (Notable)
18 August 1940	Medowie Post Office, AU	daily rain	43.9 mm (1.7 in)	38.3 mm (1.5 in)	20 years	43 of 100 (Notable)
18 August 1940	Hewitt, US	daily rain	68.1 mm (2.7 in)	37.6 mm (1.5 in)	42 years	42 of 100 (Notable)
18 August 1940	Llano, US	daily rain	63.5 mm (2.5 in)	47.5 mm (1.9 in)	25 years	40 of 100 (Notable)
18 August 1940	Steveston, CA	all-time high min	21.7 C (71.1 F)	2.3 C (4.1 F)	24 years	39 of 100 (Notable)
18 August 1940	Stratford, CA	monthly rain	78.7 mm (3.1 in)	3.8 mm (0.15 in)	62 years	38 of 100 (Notable)
18 August 1940	Dullabcherra, IN	monthly rain	135.9 mm (5.4 in)	24.1 mm (0.9 in)	33 years	38 of 100 (Notable)
18 August 1940	Dialville 2 W, US	daily rain	69.6 mm (2.7 in)	37.8 mm (1.5 in)	37 years	38 of 100 (Notable)
18 August 1940	Pine Brush, AU	daily rain	31.0 mm (1.2 in)	27.2 mm (1.1 in)	34 years	37 of 100 (Notable)
18 August 1940	Emsdale, CA	daily rain	53.3 mm (2.1 in)	26.6 mm (1.0 in)	21 years	37 of 100 (Notable)
18 August 1940	Junction 4SSW, US	daily rain	48.8 mm (1.9 in)	36.6 mm (1.4 in)	34 years	36 of 100 (Notable)
18 August 1940	Gannavaram, IN	daily rain	78.7 mm (3.1 in)	35.5 mm (1.4 in)	39 years	35 of 100 (Notable)
18 August 1940	Bhimavaram, IN	monthly rain	88.9 mm (3.5 in)	12.7 mm (0.5 in)	37 years	34 of 100 (Routine)
18 August 1940	Winnemucca AP, US	daily high min	21.1 C (70.0 F)	3.9 C (7.0 F)	62 years	34 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 434 records.

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

Records on 08-18 in each year
Year	Records
1797	2
1805	1
1816	1
1827	1
1829	1
1830	1
1833	1
1841	1
1844	1
1845	3
1846	1
1847	1
1849	1
1851	1
1852	1
1853	1
1854	2
1855	1
1856	1
1861	1
1864	2
1866	1
1868	2
1869	1
1870	2
1872	1
1873	1
1875	3
1876	1
1878	1
1879	2
1883	3
1885	3
1886	3
1887	3
1888	2
1889	1
1890	1
1891	2
1892	6
1893	4
1894	4
1895	1
1898	4
1899	6
1900	2
1901	10
1902	8
1903	6
1904	8
1905	10
1906	40
1907	7
1908	21
1909	24
1910	16
1911	11
1912	21
1913	43
1914	37
1915	60
1916	71
1917	70
1918	53
1919	34
1920	51
1921	39
1922	129
1923	90
1924	225
1925	300
1926	168
1927	269
1928	141
1929	181
1930	150
1931	241
1932	382
1933	431
1934	638
1935	424
1936	766
1937	308
1938	243
1939	381
1940	434
1941	467
1942	333
1943	738
1944	325
1945	400
1946	416
1947	958
1948	315
1949	393
1950	683
1951	355
1952	405
1953	323
1954	622
1955	795
1956	580
1957	380
1958	580
1959	537
1960	599
1961	415
1962	428
1963	760
1964	443
1965	525
1966	573
1967	623
1968	795
1969	530
1970	597
1971	381
1972	493
1973	734
1974	639
1975	844
1976	917
1977	1,112
1978	854
1979	1,309
1980	771
1981	1,386
1982	563
1983	1,420
1984	600
1985	765
1986	861
1987	1,609
1988	1,351
1989	952
1990	920
1991	533
1992	1,497
1993	706
1994	1,027
1995	1,882
1996	760
1997	1,191
1998	923
1999	888
2000	1,183
2001	1,036
2002	1,306
2003	860
2004	1,050
2005	865
2006	842
2007	1,116
2008	1,265
2009	839
2010	1,167
2011	1,239
2012	1,247
2013	752
2014	751
2015	880
2016	704
2017	565
2018	462
2019	615
2020	1,541
2021	1,118
2022	1,237
2023	1,094
2024	696
2025	455
2026	545

Download the Data

Data for records on 1940-08-18: 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	233
10 to 20	45
20 to 30	19
30 to 40	15
40 to 50	5
50 to 60	0
60 to 70	4