Weather Records on 12 August 1918

37 weather records were set or tied worldwide on 12 August 1918. Highest significance: Brantford, CA.

Key Facts for 12 August 1918

On 12 August 1918, 37 weather records were set or tied at long-record stations worldwide.
20 were record highs and 8 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 1 monthly and 36 daily.
Brantford set a daily record precipitation of 44.5 mm (1.8 in) on 12 August 1918.
Across 166 earlier years (1793 to 2026) the same calendar date averaged 450 records.

Record Map

37 stations

37 station records on 12 August 1918 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 12 August 1918: highest significance records shown on the map
Station	Country	Type	Value	Significance
Brantford	Canada	Record daily precipitation	44.5 mm (1.8 in)	39 of 100 (Notable)
Morden	Canada	Record daily precipitation	40.6 mm (1.6 in)	31 of 100 (Routine)
Lexington Bluegrass AP	United States	Record high minimum temperature	26.1 C (79.0 F)	28 of 100 (Routine)
La Crosse Wb City	United States	Record high maximum temperature	35.0 C (95.0 F)	24 of 100 (Routine)
Madison Wb City	United States	Record high maximum temperature	36.1 C (97.0 F)	21 of 100 (Routine)
Winnipeg St Johns Coll	Canada	Record daily precipitation	20.6 mm (0.8 in)	20 of 100 (Routine)
Port Arthur	Canada	Record daily precipitation	18.3 mm (0.7 in)	19 of 100 (Routine)
Dubuque River	United States	Record high maximum temperature	36.7 C (98.1 F)	19 of 100 (Routine)
Coldwater	Canada	Record high minimum temperature	22.8 C (73.0 F)	18 of 100 (Routine)
Qu'appelle	Canada	Record low maximum temperature	12.8 C (55.0 F)	17 of 100 (Routine)
Philadelphia City	United States	Record daily precipitation	40.6 mm (1.6 in)	16 of 100 (Routine)
Arhangelsk	Russia	Record low minimum temperature	2.0 C (35.6 F)	15 of 100 (Routine)
Somerville 4 NW	United States	Record daily precipitation	29.7 mm (1.2 in)	15 of 100 (Routine)
Lucknow	Canada	Record high maximum temperature	31.7 C (89.1 F)	14 of 100 (Routine)
Stoney Creek	Canada	Record daily precipitation	16.5 mm (0.6 in)	12 of 100 (Routine)
Medicine Hat A	Canada	Record daily precipitation	13.5 mm (0.5 in)	11 of 100 (Routine)
Lincoln UNIV Pwr Plt	United States	Record high minimum temperature	26.7 C (80.1 F)	11 of 100 (Routine)
Haliburton A	Canada	Record high maximum temperature	30.0 C (86.0 F)	10 of 100 (Routine)
Concordia ASOS	United States	Record high minimum temperature	26.1 C (79.0 F)	10 of 100 (Routine)
Malvern	United States	Record high maximum temperature	40.0 C (104.0 F)	9 of 100 (Routine)
Swift Current	Canada	Record low maximum temperature	17.2 C (63.0 F)	8 of 100 (Routine)
Belle Isle	Canada	Record low minimum temperature	3.9 C (39.0 F)	8 of 100 (Routine)
St Albans	Canada	Record low maximum temperature	17.8 C (64.0 F)	7 of 100 (Routine)
Coldwater	Canada	Record high maximum temperature	32.2 C (90.0 F)	7 of 100 (Routine)
Whitehead	Canada	Record daily precipitation	26.2 mm (1.0 in)	7 of 100 (Routine)
Lincoln UNIV Pwr Plt	United States	Record high maximum temperature	39.4 C (102.9 F)	7 of 100 (Routine)
St. Petersburg	Russia	Record low minimum temperature	7.3 C (45.1 F)	6 of 100 (Routine)
Tbilisi	Georgia	Record high minimum temperature	21.7 C (71.1 F)	4 of 100 (Routine)
Wilmington Wb City	United States	Record high maximum temperature	34.4 C (93.9 F)	3 of 100 (Routine)
Milwaukee Wb City	United States	Record high maximum temperature	31.7 C (89.1 F)	3 of 100 (Routine)
Medicine Hat A	Canada	Record low maximum temperature	20.0 C (68.0 F)	2 of 100 (Routine)
Moose Factory	Canada	Record low minimum temperature	3.3 C (37.9 F)	2 of 100 (Routine)
Brantford	Canada	Record high maximum temperature	33.3 C (91.9 F)	2 of 100 (Routine)
Guelph Oac	Canada	Record high maximum temperature	31.7 C (89.1 F)	2 of 100 (Routine)
Lakefield	Canada	Record high minimum temperature	21.7 C (71.1 F)	2 of 100 (Routine)
Harrisburg - Coop	United States	Record high minimum temperature	22.2 C (72.0 F)	2 of 100 (Routine)
Morgantown 1	United States	Record high minimum temperature	21.1 C (70.0 F)	1 of 100 (Routine)

Counts by Type and Timescale

37 records

Records set or tied on 12 August 1918 by type: Highest daily maximum 12, Lowest daily maximum 4, Highest daily minimum 8, Lowest daily minimum 4, Heaviest daily rainfall 9.

Records on 12 August 1918 by type
Record type	Records
Highest daily maximum	12
Lowest daily maximum	4
Highest daily minimum	8
Lowest daily minimum	4
Heaviest daily rainfall	9
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 12 August 1918 by timescale: all-time 0, monthly 1, daily 36.

How Much Records Were Beaten By

28 broken records

Margins by which the 28 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 34.1. Ties are not counted.

Top 20 by Significance

12 August 1918

Top 20 records on 12 August 1918 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
12 August 1918	Brantford, CA	daily rain	44.5 mm (1.8 in)	34.1 mm (1.3 in)	36 years	39 of 100 (Notable)
12 August 1918	Morden, CA	daily rain	40.6 mm (1.6 in)	33.7 mm (1.3 in)	9 years	31 of 100 (Routine)
12 August 1918	Lexington Bluegrass AP, US	monthly high min	26.1 C (79.0 F)	0.5 C (0.9 F)	43 years	28 of 100 (Routine)
12 August 1918	La Crosse Wb City, US	daily high max	35.0 C (95.0 F)	2.8 C (5.0 F)	44 years	24 of 100 (Routine)
12 August 1918	Madison Wb City, US	daily high max	36.1 C (97.0 F)	2.8 C (5.0 F)	31 years	21 of 100 (Routine)
12 August 1918	Winnipeg St Johns Coll, CA	daily rain	20.6 mm (0.8 in)	6.1 mm (0.24 in)	41 years	20 of 100 (Routine)
12 August 1918	Port Arthur, CA	daily rain	18.3 mm (0.7 in)	3.8 mm (0.15 in)	38 years	19 of 100 (Routine)
12 August 1918	Dubuque River, US	daily high max	36.7 C (98.1 F)	1.1 C (2.0 F)	43 years	19 of 100 (Routine)
12 August 1918	Coldwater, CA	daily high min	22.8 C (73.0 F)	4.5 C (8.1 F)	21 years	18 of 100 (Routine)
12 August 1918	Qu'appelle, CA	daily low max	12.8 C (55.0 F)	3.9 C (7.0 F)	18 years	17 of 100 (Routine)
12 August 1918	Philadelphia City, US	daily rain	40.6 mm (1.6 in)	12.2 mm (0.5 in)	16 years	16 of 100 (Routine)
12 August 1918	Arhangelsk, RU	daily low min	2.0 C (35.6 F)	2.6 C (4.7 F)	22 years	15 of 100 (Routine)
12 August 1918	Somerville 4 NW, US	daily rain	29.7 mm (1.2 in)	9.4 mm (0.37 in)	25 years	15 of 100 (Routine)
12 August 1918	Lucknow, CA	daily high max	31.7 C (89.1 F)	2.8 C (5.0 F)	18 years	14 of 100 (Routine)
12 August 1918	Stoney Creek, CA	daily rain	16.5 mm (0.6 in)	4.1 mm (0.16 in)	21 years	12 of 100 (Routine)
12 August 1918	Medicine Hat A, CA	daily rain	13.5 mm (0.5 in)	5.9 mm (0.23 in)	9 years	11 of 100 (Routine)
12 August 1918	Lincoln UNIV Pwr Plt, US	daily high min	26.7 C (80.1 F)	2.3 C (4.1 F)	8 years	11 of 100 (Routine)
12 August 1918	Haliburton A, CA	daily high max	30.0 C (86.0 F)	0.6 C (1.1 F)	21 years	10 of 100 (Routine)
12 August 1918	Concordia ASOS, US	daily high min	26.1 C (79.0 F)	2.2 C (4.0 F)	8 years	10 of 100 (Routine)
12 August 1918	Malvern, US	daily high max	40.0 C (104.0 F)	0.6 C (1.1 F)	18 years	9 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

1793 to 1918

Records set or tied on this calendar date in each year from 1793 to 1918. 1918 had 37 records.

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

Records on 08-12 in each year
Year	Records
1793	1
1796	1
1811	2
1814	1
1815	1
1825	1
1843	1
1851	1
1854	1
1855	2
1856	1
1861	1
1864	3
1865	1
1867	1
1868	1
1871	2
1872	1
1873	1
1874	2
1875	3
1876	2
1879	1
1881	2
1883	1
1884	1
1885	1
1887	2
1888	2
1889	4
1890	4
1891	4
1892	2
1893	1
1894	1
1895	6
1896	2
1897	4
1898	1
1899	10
1900	1
1901	5
1902	9
1903	14
1904	13
1905	16
1906	8
1907	8
1908	31
1909	42
1910	16
1911	33
1912	40
1913	39
1914	26
1915	46
1916	31
1917	134
1918	37
1919	42
1920	26
1921	174
1922	71
1923	89
1924	267
1925	150
1926	154
1927	145
1928	173
1929	276
1930	501
1931	708
1932	418
1933	271
1934	471
1935	408
1936	591
1937	356
1938	237
1939	282
1940	545
1941	481
1942	257
1943	523
1944	595
1945	295
1946	655
1947	729
1948	384
1949	469
1950	442
1951	357
1952	533
1953	227
1954	969
1955	590
1956	265
1957	384
1958	406
1959	388
1960	707
1961	381
1962	466
1963	559
1964	1,346
1965	977
1966	777
1967	1,135
1968	444
1969	629
1970	422
1971	486
1972	473
1973	442
1974	560
1975	593
1976	495
1977	747
1978	571
1979	1,192
1980	692
1981	665
1982	789
1983	923
1984	665
1985	935
1986	615
1987	935
1988	1,518
1989	827
1990	727
1991	726
1992	1,134
1993	936
1994	861
1995	1,654
1996	1,336
1997	1,363
1998	1,215
1999	1,325
2000	741
2001	855
2002	1,345
2003	1,752
2004	1,872
2005	1,085
2006	874
2007	1,209
2008	970
2009	814
2010	1,907
2011	903
2012	910
2013	427
2014	787
2015	757
2016	1,290
2017	533
2018	571
2019	695
2020	730
2021	980
2022	616
2023	779
2024	659
2025	639
2026	849

Download the Data

Data for records on 1918-08-12: 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 5	22
5 to 10	3
10 to 15	1
15 to 20	0
20 to 25	0
25 to 30	0
30 to 35	2