Weather Records on 18 May 1940

315 weather records were set or tied worldwide on 18 May 1940. Highest significance: Caguas, PR.

Key Facts for 18 May 1940

On 18 May 1940, 315 weather records were set or tied at long-record stations worldwide.
102 were record highs and 48 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 2 monthly and 313 daily.
Caguas set a daily record precipitation of 89.4 mm (3.5 in) on 18 May 1940.
Across 164 earlier years (1796 to 2026) the same calendar date averaged 443 records.

Record Map

315 stations

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

Weather records on 18 May 1940: highest significance records shown on the map
Station	Country	Type	Value	Significance
Caguas	Puerto Rico [United States]	Record daily precipitation	89.4 mm (3.5 in)	48 of 100 (Notable)
Elkhart	United States	Record daily precipitation	102.4 mm (4.0 in)	47 of 100 (Notable)
Sankari	India	Record daily precipitation	77.5 mm (3.1 in)	46 of 100 (Notable)
Sitka Magnetic Obsy	United States	Record daily precipitation	37.8 mm (1.5 in)	40 of 100 (Notable)
Chickballapur	India	Record daily precipitation	63.5 mm (2.5 in)	39 of 100 (Notable)
Scott City	United States	Record daily precipitation	61.7 mm (2.4 in)	39 of 100 (Notable)
Ettumanur	India	Record daily precipitation	119.9 mm (4.7 in)	37 of 100 (Notable)
Lakin	United States	Record daily precipitation	55.1 mm (2.2 in)	37 of 100 (Notable)
Konni	India	Record daily precipitation	108.7 mm (4.3 in)	35 of 100 (Notable)
Healy	United States	Record daily precipitation	63.5 mm (2.5 in)	35 of 100 (Notable)
Chanute Martin Johnson AP	United States	Record daily precipitation	79.8 mm (3.1 in)	34 of 100 (Routine)
Omalur	India	Record daily precipitation	64.3 mm (2.5 in)	33 of 100 (Routine)
Kottayam P.W.D	India	Record daily precipitation	117.6 mm (4.6 in)	32 of 100 (Routine)
Ponce 4 E	Puerto Rico [United States]	Record daily precipitation	59.9 mm (2.4 in)	30 of 100 (Routine)
Two Buttes	United States	Record daily precipitation	34.3 mm (1.4 in)	30 of 100 (Routine)
Independence	United States	Record daily precipitation	55.9 mm (2.2 in)	30 of 100 (Routine)
Hambantota	Sri Lanka	Record low minimum temperature	22.2 C (72.0 F)	29 of 100 (Routine)
Sidlaghatta	India	Record daily precipitation	53.1 mm (2.1 in)	29 of 100 (Routine)
Calarasi	Romania	Record low minimum temperature	0.0 C (32.0 F)	29 of 100 (Routine)
Springfield	United States	Record daily precipitation	46.7 mm (1.8 in)	29 of 100 (Routine)
Ulysses 3NE	United States	Record daily precipitation	38.9 mm (1.5 in)	29 of 100 (Routine)
Pawhuska	United States	Record daily precipitation	74.2 mm (2.9 in)	29 of 100 (Routine)
Adur	India	Record daily precipitation	100.1 mm (3.9 in)	28 of 100 (Routine)
Chatrapatti	India	Record daily precipitation	58.4 mm (2.3 in)	27 of 100 (Routine)
Bedford	United States	Record daily precipitation	25.4 mm (1.0 in)	27 of 100 (Routine)
Jefferson 3SE	United States	Record daily precipitation	69.1 mm (2.7 in)	27 of 100 (Routine)
Corning	United States	Record daily precipitation	31.2 mm (1.2 in)	26 of 100 (Routine)
Pala	India	Record daily precipitation	93.2 mm (3.7 in)	25 of 100 (Routine)
Olympia Priest Pt Park	United States	Record high maximum temperature	31.1 C (88.0 F)	25 of 100 (Routine)
Colton (Boola Boola)	Australia	Record daily precipitation	27.7 mm (1.1 in)	24 of 100 (Routine)
Sirkali	India	Record daily precipitation	38.1 mm (1.5 in)	24 of 100 (Routine)
Jetmore	United States	Record daily precipitation	48.3 mm (1.9 in)	24 of 100 (Routine)
Yates Ctr	United States	Record daily precipitation	39.1 mm (1.5 in)	24 of 100 (Routine)
Aibonito 1 S	Puerto Rico [United States]	Record daily precipitation	84.1 mm (3.3 in)	23 of 100 (Routine)
Caguas	Puerto Rico [United States]	Record low maximum temperature	27.8 C (82.0 F)	23 of 100 (Routine)
Kissimmee	United States	Record low minimum temperature	10.6 C (51.1 F)	23 of 100 (Routine)
Garden City	United States	Record daily precipitation	55.9 mm (2.2 in)	23 of 100 (Routine)
Lawrence	United States	Record daily precipitation	50.8 mm (2.0 in)	23 of 100 (Routine)
Kinglake	Australia	Record daily precipitation	37.1 mm (1.5 in)	22 of 100 (Routine)
Silvan State School	Australia	Record daily precipitation	25.4 mm (1.0 in)	21 of 100 (Routine)
Gospic	Croatia	Record low maximum temperature	11.6 C (52.9 F)	21 of 100 (Routine)
Dharapuram	India	Record daily precipitation	38.1 mm (1.5 in)	21 of 100 (Routine)
Hugoton	United States	Record daily precipitation	44.5 mm (1.8 in)	21 of 100 (Routine)
Orono	United States	Record high minimum temperature	10.6 C (51.1 F)	21 of 100 (Routine)
Hilo 86A	United States	Record high maximum temperature	30.6 C (87.1 F)	21 of 100 (Routine)
Koloa 936	United States	Record high maximum temperature	29.4 C (84.9 F)	21 of 100 (Routine)
Swansea Post Office	Australia	Record daily precipitation	23.1 mm (0.9 in)	20 of 100 (Routine)
Oatlands Post Office	Australia	Record daily precipitation	15.0 mm (0.6 in)	20 of 100 (Routine)
Steppes (Old Post Office)	Australia	Record daily precipitation	20.3 mm (0.8 in)	20 of 100 (Routine)
Lock (Terre)	Australia	Record daily precipitation	16.3 mm (0.6 in)	20 of 100 (Routine)
Tucson WFO	United States	Record daily precipitation	7.4 mm (0.29 in)	20 of 100 (Routine)
Mangalore (Mangalore Farm)	Australia	Record daily precipitation	15.5 mm (0.6 in)	20 of 100 (Routine)
Hamilton (Uralla)	Australia	Record daily precipitation	18.8 mm (0.7 in)	20 of 100 (Routine)
Eltham	Australia	Record daily precipitation	13.0 mm (0.5 in)	20 of 100 (Routine)
Kingston	Australia	Record daily precipitation	24.9 mm (1.0 in)	20 of 100 (Routine)
Trentham (Post Office)	Australia	Record daily precipitation	16.3 mm (0.6 in)	20 of 100 (Routine)
Gila Bend 2SE	United States	Record daily precipitation	6.1 mm (0.24 in)	20 of 100 (Routine)
La Veta Pass	United States	Record daily precipitation	24.9 mm (1.0 in)	20 of 100 (Routine)
Artesia 6S	United States	Record daily precipitation	12.4 mm (0.5 in)	20 of 100 (Routine)
Hawthorn	Australia	Record daily precipitation	15.7 mm (0.6 in)	20 of 100 (Routine)

Counts by Type and Timescale

315 records

Records set or tied on 18 May 1940 by type: Highest daily maximum 69, Lowest daily maximum 22, Highest daily minimum 33, Lowest daily minimum 26, Heaviest daily rainfall 164, Heaviest daily snowfall 1.

Records on 18 May 1940 by type
Record type	Records
Highest daily maximum	69
Lowest daily maximum	22
Highest daily minimum	33
Lowest daily minimum	26
Heaviest daily rainfall	164
Heaviest daily snowfall	1
Deepest snow cover	0

Records on 18 May 1940 by timescale: all-time 0, monthly 2, daily 313.

How Much Records Were Beaten By

252 broken records

Margins by which the 252 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 74.4. Ties are not counted.

Top 20 by Significance

18 May 1940

Top 20 records on 18 May 1940 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 May 1940	Caguas, PR	daily rain	89.4 mm (3.5 in)	56.1 mm (2.2 in)	29 years	48 of 100 (Notable)
18 May 1940	Elkhart, US	monthly rain	102.4 mm (4.0 in)	27.7 mm (1.1 in)	26 years	47 of 100 (Notable)
18 May 1940	Sankari, IN	daily rain	77.5 mm (3.1 in)	47.5 mm (1.9 in)	38 years	46 of 100 (Notable)
18 May 1940	Sitka Magnetic Obsy, US	daily rain	37.8 mm (1.5 in)	24.1 mm (0.9 in)	11 years	40 of 100 (Notable)
18 May 1940	Chickballapur, IN	daily rain	63.5 mm (2.5 in)	46.2 mm (1.8 in)	8 years	39 of 100 (Notable)
18 May 1940	Scott City, US	daily rain	61.7 mm (2.4 in)	38.6 mm (1.5 in)	5 years	39 of 100 (Notable)
18 May 1940	Ettumanur, IN	daily rain	119.9 mm (4.7 in)	61.0 mm (2.4 in)	36 years	37 of 100 (Notable)
18 May 1940	Lakin, US	daily rain	55.1 mm (2.2 in)	28.4 mm (1.1 in)	25 years	37 of 100 (Notable)
18 May 1940	Konni, IN	daily rain	108.7 mm (4.3 in)	74.4 mm (2.9 in)	8 years	35 of 100 (Notable)
18 May 1940	Healy, US	daily rain	63.5 mm (2.5 in)	26.7 mm (1.1 in)	25 years	35 of 100 (Notable)
18 May 1940	Chanute Martin Johnson AP, US	daily rain	79.8 mm (3.1 in)	48.0 mm (1.9 in)	11 years	34 of 100 (Routine)
18 May 1940	Omalur, IN	daily rain	64.3 mm (2.5 in)	28.0 mm (1.1 in)	36 years	33 of 100 (Routine)
18 May 1940	Kottayam P.W.D, IN	daily rain	117.6 mm (4.6 in)	48.3 mm (1.9 in)	37 years	32 of 100 (Routine)
18 May 1940	Ponce 4 E, PR	daily rain	59.9 mm (2.4 in)	29.4 mm (1.2 in)	13 years	30 of 100 (Routine)
18 May 1940	Two Buttes, US	daily rain	34.3 mm (1.4 in)	21.1 mm (0.8 in)	25 years	30 of 100 (Routine)
18 May 1940	Independence, US	daily rain	55.9 mm (2.2 in)	31.5 mm (1.2 in)	12 years	30 of 100 (Routine)
18 May 1940	Hambantota, LK	daily low min	22.2 C (72.0 F)	0.5 C (0.9 F)	60 years	29 of 100 (Routine)
18 May 1940	Sidlaghatta, IN	daily rain	53.1 mm (2.1 in)	23.4 mm (0.9 in)	37 years	29 of 100 (Routine)
18 May 1940	Calarasi, RO	daily low min	0.0 C (32.0 F)	7.0 C (12.6 F)	22 years	29 of 100 (Routine)
18 May 1940	Springfield, US	daily rain	46.7 mm (1.8 in)	18.8 mm (0.7 in)	40 years	29 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

1796 to 1940

Records set or tied on this calendar date in each year from 1796 to 1940. 1940 had 315 records.

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

Records on 05-18 in each year
Year	Records
1796	1
1798	1
1802	2
1832	1
1833	1
1845	1
1847	1
1848	1
1855	1
1859	1
1861	2
1863	3
1864	1
1866	2
1868	2
1869	1
1870	1
1871	2
1872	1
1874	2
1877	4
1878	1
1879	1
1881	1
1883	2
1884	2
1885	1
1887	1
1888	4
1889	2
1891	1
1893	2
1894	4
1895	5
1896	2
1897	2
1898	1
1899	1
1900	13
1901	6
1902	9
1903	7
1904	11
1905	2
1906	24
1907	18
1908	5
1909	12
1910	50
1911	64
1912	5
1913	11
1914	45
1915	55
1916	74
1917	30
1918	42
1919	30
1920	26
1921	41
1922	33
1923	61
1924	92
1925	220
1926	133
1927	180
1928	160
1929	193
1930	475
1931	191
1932	460
1933	380
1934	390
1935	400
1936	282
1937	348
1938	382
1939	169
1940	315
1941	334
1942	421
1943	744
1944	496
1945	706
1946	651
1947	231
1948	426
1949	597
1950	473
1951	279
1952	493
1953	393
1954	498
1955	848
1956	795
1957	595
1958	334
1959	435
1960	404
1961	187
1962	1,199
1963	477
1964	329
1965	345
1966	438
1967	410
1968	817
1969	865
1970	703
1971	666
1972	499
1973	1,233
1974	1,097
1975	383
1976	733
1977	1,126
1978	1,090
1979	399
1980	614
1981	1,218
1982	452
1983	1,093
1984	717
1985	498
1986	1,131
1987	823
1988	1,154
1989	721
1990	753
1991	1,218
1992	921
1993	707
1994	1,015
1995	1,849
1996	1,767
1997	1,115
1998	1,060
1999	584
2000	922
2001	898
2002	1,833
2003	1,270
2004	847
2005	630
2006	1,493
2007	1,133
2008	999
2009	1,368
2010	894
2011	1,406
2012	523
2013	816
2014	609
2015	785
2016	597
2017	1,855
2018	557
2019	810
2020	706
2021	418
2022	711
2023	554
2024	551
2025	619
2026	1,131

Download the Data

Data for records on 1940-05-18: 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	202
10 to 20	27
20 to 30	10
30 to 40	5
40 to 50	5
50 to 60	1
60 to 70	1
70 to 80	1