Weather Records on 18 August 1938

243 weather records were set or tied worldwide on 18 August 1938. Highest significance: Kualapuu 534, US.

Key Facts for 18 August 1938

On 18 August 1938, 243 weather records were set or tied at long-record stations worldwide.
104 were record highs and 35 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 9 monthly and 232 daily.
Kualapuu 534 set a monthly record daily precipitation of 62.7 mm (2.5 in) on 18 August 1938.
Across 171 earlier years (1797 to 2026) the same calendar date averaged 442 records.

Record Map

243 stations

243 station records on 18 August 1938 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 August 1938: highest significance records shown on the map
Station	Country	Type	Value	Significance
Kualapuu 534	United States	Record daily precipitation	62.7 mm (2.5 in)	58 of 100 (Notable)
Cornwall	United States	Record daily precipitation	65.3 mm (2.6 in)	57 of 100 (Notable)
Ramdurg	India	Record daily precipitation	81.5 mm (3.2 in)	53 of 100 (Notable)
Williamsport	United States	Record daily precipitation	100.3 mm (3.9 in)	49 of 100 (Notable)
Navalgund	India	Record daily precipitation	59.4 mm (2.3 in)	43 of 100 (Notable)
Chelsea	United States	Record daily precipitation	64.5 mm (2.5 in)	43 of 100 (Notable)
Uppiliyapuram	India	Record daily precipitation	92.7 mm (3.6 in)	40 of 100 (Notable)
Salem	India	Record daily precipitation	111.8 mm (4.4 in)	39 of 100 (Notable)
Hardoi	India	Record daily precipitation	104.1 mm (4.1 in)	39 of 100 (Notable)
Kokpekty	Kazakhstan	Record daily precipitation	36.5 mm (1.4 in)	38 of 100 (Notable)
Owosso Wwtp	United States	Record daily precipitation	43.7 mm (1.7 in)	36 of 100 (Notable)
Oran-Hopital Militaire	Algeria	Record high minimum temperature	26.0 C (78.8 F)	33 of 100 (Routine)
Northfield	United States	Record daily precipitation	38.9 mm (1.5 in)	32 of 100 (Routine)
Hana 354	United States	Record daily precipitation	29.2 mm (1.1 in)	31 of 100 (Routine)
Waianae 798	United States	Record low maximum temperature	27.2 C (81.0 F)	31 of 100 (Routine)
Sherbrooke	Canada	Record daily precipitation	38.6 mm (1.5 in)	30 of 100 (Routine)
Willcox	United States	Record low minimum temperature	5.0 C (41.0 F)	30 of 100 (Routine)
Poronajsk	Russia	Record high minimum temperature	19.4 C (66.9 F)	29 of 100 (Routine)
New Smyrna Beach	United States	Record high maximum temperature	38.3 C (100.9 F)	29 of 100 (Routine)
Atmakur	India	Record daily precipitation	32.5 mm (1.3 in)	28 of 100 (Routine)
Ron	India	Record daily precipitation	48.8 mm (1.9 in)	28 of 100 (Routine)
Tiruvannamalai	India	Record daily precipitation	86.1 mm (3.4 in)	27 of 100 (Routine)
Saint John	Canada	Record high minimum temperature	16.1 C (61.0 F)	26 of 100 (Routine)
North Lakhimpur	India	Record daily precipitation	92.7 mm (3.6 in)	26 of 100 (Routine)
Laurel 3 W	United States	Record daily precipitation	32.3 mm (1.3 in)	26 of 100 (Routine)
Cortland	United States	Record daily precipitation	71.1 mm (2.8 in)	26 of 100 (Routine)
Spier Falls	United States	Record daily precipitation	43.2 mm (1.7 in)	26 of 100 (Routine)
Brome	Canada	Record daily precipitation	35.1 mm (1.4 in)	25 of 100 (Routine)
Yarmouth	Canada	Record high maximum temperature	27.2 C (81.0 F)	25 of 100 (Routine)
Haraiya	India	Record daily precipitation	71.1 mm (2.8 in)	25 of 100 (Routine)
Okhimath	India	Record daily precipitation	81.3 mm (3.2 in)	25 of 100 (Routine)
Ulysses 3NE	United States	Record daily precipitation	28.4 mm (1.1 in)	25 of 100 (Routine)
Moorhead St Teachers C	United States	Record daily precipitation	30.7 mm (1.2 in)	25 of 100 (Routine)
Macharla	India	Record daily precipitation	32.0 mm (1.3 in)	24 of 100 (Routine)
Sriperumbudur	India	Record daily precipitation	50.8 mm (2.0 in)	24 of 100 (Routine)
Kayatnur	India	Record daily precipitation	48.3 mm (1.9 in)	24 of 100 (Routine)
Fernandina Beach	United States	Record high maximum temperature	38.9 C (102.0 F)	24 of 100 (Routine)
Kadiri	India	Record daily precipitation	54.9 mm (2.2 in)	23 of 100 (Routine)
Madakasira	India	Record daily precipitation	73.7 mm (2.9 in)	23 of 100 (Routine)
Janwada	India	Record daily precipitation	101.6 mm (4.0 in)	23 of 100 (Routine)
Ramnagaram	India	Record daily precipitation	67.1 mm (2.6 in)	23 of 100 (Routine)
Oracle	United States	Record low minimum temperature	10.0 C (50.0 F)	23 of 100 (Routine)
Sable Island	Canada	Record high minimum temperature	19.4 C (66.9 F)	22 of 100 (Routine)
Magadi	India	Record daily precipitation	71.4 mm (2.8 in)	21 of 100 (Routine)
Paramakudi	India	Record daily precipitation	39.1 mm (1.5 in)	21 of 100 (Routine)
Represa	United States	Record low maximum temperature	24.4 C (75.9 F)	21 of 100 (Routine)
Thursday Island Township	Australia	Record daily precipitation	4.1 mm (0.16 in)	20 of 100 (Routine)
Yatchaw (Amaroo)	Australia	Record daily precipitation	20.8 mm (0.8 in)	20 of 100 (Routine)
Holmogadd A	Sweden	Record daily precipitation	21.5 mm (0.8 in)	20 of 100 (Routine)
Saint Ignatius	United States	Record daily precipitation	22.9 mm (0.9 in)	20 of 100 (Routine)
Gotska Sandon	Sweden	Record daily precipitation	19.2 mm (0.8 in)	20 of 100 (Routine)
Sultan Bazar	India	Record daily precipitation	36.3 mm (1.4 in)	20 of 100 (Routine)
Buckeye	United States	Record low minimum temperature	12.8 C (55.0 F)	20 of 100 (Routine)
Maricopa 9 SSW	United States	Record low minimum temperature	12.8 C (55.0 F)	20 of 100 (Routine)
Riverside Fire STN 3	United States	Record low maximum temperature	26.7 C (80.1 F)	20 of 100 (Routine)
Towanda 1 S	United States	Record daily precipitation	36.8 mm (1.4 in)	20 of 100 (Routine)
Haleakala Rch 432	United States	Record daily precipitation	43.9 mm (1.7 in)	20 of 100 (Routine)
Pembina	United States	Record high minimum temperature	21.1 C (70.0 F)	20 of 100 (Routine)
Goondi Mill Csr	Australia	Record daily precipitation	59.7 mm (2.4 in)	19 of 100 (Routine)
Lake Moraine	United States	Record high maximum temperature	23.9 C (75.0 F)	19 of 100 (Routine)

Counts by Type and Timescale

243 records

Records set or tied on 18 August 1938 by type: Highest daily maximum 43, Lowest daily maximum 15, Highest daily minimum 61, Lowest daily minimum 20, Heaviest daily rainfall 104.

Records on 18 August 1938 by type
Record type	Records
Highest daily maximum	43
Lowest daily maximum	15
Highest daily minimum	61
Lowest daily minimum	20
Heaviest daily rainfall	104
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 18 August 1938 by timescale: all-time 2, monthly 9, daily 232.

How Much Records Were Beaten By

177 broken records

Margins by which the 177 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 76.2. Ties are not counted.

Top 20 by Significance

18 August 1938

Top 20 records on 18 August 1938 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 August 1938	Kualapuu 534, US	monthly rain	62.7 mm (2.5 in)	28.7 mm (1.1 in)	18 years	58 of 100 (Notable)
18 August 1938	Cornwall, US	daily rain	65.3 mm (2.6 in)	50.1 mm (2.0 in)	41 years	57 of 100 (Notable)
18 August 1938	Ramdurg, IN	daily rain	81.5 mm (3.2 in)	61.7 mm (2.4 in)	35 years	53 of 100 (Notable)
18 August 1938	Williamsport, US	daily rain	100.3 mm (3.9 in)	66.0 mm (2.6 in)	17 years	49 of 100 (Notable)
18 August 1938	Navalgund, IN	daily rain	59.4 mm (2.3 in)	42.4 mm (1.7 in)	28 years	43 of 100 (Notable)
18 August 1938	Chelsea, US	daily rain	64.5 mm (2.5 in)	38.1 mm (1.5 in)	16 years	43 of 100 (Notable)
18 August 1938	Uppiliyapuram, IN	daily rain	92.7 mm (3.6 in)	49.5 mm (1.9 in)	20 years	40 of 100 (Notable)
18 August 1938	Salem, IN	daily rain	111.8 mm (4.4 in)	58.2 mm (2.3 in)	3 years	39 of 100 (Notable)
18 August 1938	Hardoi, IN	daily rain	104.1 mm (4.1 in)	76.2 mm (3.0 in)	16 years	39 of 100 (Notable)
18 August 1938	Kokpekty, KZ	monthly rain	36.5 mm (1.4 in)	9.0 mm (0.35 in)	18 years	38 of 100 (Notable)
18 August 1938	Owosso Wwtp, US	daily rain	43.7 mm (1.7 in)	25.4 mm (1.0 in)	21 years	36 of 100 (Notable)
18 August 1938	Oran-Hopital Militaire, DZ	daily high min	26.0 C (78.8 F)	1.0 C (1.8 F)	71 years	33 of 100 (Routine)
18 August 1938	Northfield, US	daily rain	38.9 mm (1.5 in)	14.8 mm (0.6 in)	44 years	32 of 100 (Routine)
18 August 1938	Hana 354, US	daily rain	29.2 mm (1.1 in)	17.0 mm (0.7 in)	31 years	31 of 100 (Routine)
18 August 1938	Waianae 798, US	daily low max	27.2 C (81.0 F)	2.8 C (5.0 F)	9 years	31 of 100 (Routine)
18 August 1938	Sherbrooke, CA	daily rain	38.6 mm (1.5 in)	21.8 mm (0.9 in)	16 years	30 of 100 (Routine)
18 August 1938	Willcox, US	monthly low min	5.0 C (41.0 F)	2.8 C (5.0 F)	20 years	30 of 100 (Routine)
18 August 1938	Poronajsk, RU	all-time high min	19.4 C (66.9 F)	0.3 C (0.5 F)	18 years	29 of 100 (Routine)
18 August 1938	New Smyrna Beach, US	daily high max	38.3 C (100.9 F)	3.3 C (5.9 F)	28 years	29 of 100 (Routine)
18 August 1938	Atmakur, IN	daily rain	32.5 mm (1.3 in)	21.1 mm (0.8 in)	23 years	28 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 1938

Records set or tied on this calendar date in each year from 1797 to 1938. 1938 had 243 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 1938-08-18: 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	118
10 to 20	33
20 to 30	12
30 to 40	6
40 to 50	3
50 to 60	2
60 to 70	2
70 to 80	1