Weather Records on 31 August 1918

58 weather records were set or tied worldwide on 31 August 1918. Highest significance: Lock #4, US.

Key Facts for 31 August 1918

On 31 August 1918, 58 weather records were set or tied at long-record stations worldwide.
7 were record highs and 9 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 4 monthly and 54 daily.
Lock #4 set a daily record precipitation of 65.5 mm (2.6 in) on 31 August 1918.
Across 165 earlier years (1796 to 2026) the same calendar date averaged 438 records.

Record Map

58 stations

58 station records on 31 August 1918 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 31 August 1918: highest significance records shown on the map
Station	Country	Type	Value	Significance
Lock #4	United States	Record daily precipitation	65.5 mm (2.6 in)	52 of 100 (Notable)
Nelson	Australia	Record daily precipitation	26.2 mm (1.0 in)	31 of 100 (Routine)
Southampton	Canada	Record daily precipitation	31.5 mm (1.2 in)	30 of 100 (Routine)
Cape Northumberland	Australia	Record daily precipitation	27.2 mm (1.1 in)	27 of 100 (Routine)
Milan	Italy	Record low minimum temperature	10.3 C (50.5 F)	27 of 100 (Routine)
Harnosand	Sweden	Record daily precipitation	38.3 mm (1.5 in)	23 of 100 (Routine)
Astoria	United States	Record high minimum temperature	17.8 C (64.0 F)	23 of 100 (Routine)
Steynsburg	South Africa	Record daily precipitation	16.5 mm (0.6 in)	20 of 100 (Routine)
Ellesmere	South Africa	Record daily precipitation	22.1 mm (0.9 in)	20 of 100 (Routine)
Tarkastad (Pol)	South Africa	Record daily precipitation	19.1 mm (0.8 in)	20 of 100 (Routine)
Coldwater	Canada	Record daily precipitation	21.1 mm (0.8 in)	20 of 100 (Routine)
Sterkstroom (Pol)	South Africa	Record daily precipitation	16.3 mm (0.6 in)	20 of 100 (Routine)
Burrawang South Station	Australia	Record daily precipitation	24.6 mm (1.0 in)	20 of 100 (Routine)
Colesberg (Tnk)	South Africa	Record daily precipitation	10.7 mm (0.4 in)	20 of 100 (Routine)
Cradock	South Africa	Record daily precipitation	19.8 mm (0.8 in)	20 of 100 (Routine)
Philipstown (Tnk)	South Africa	Record daily precipitation	13.2 mm (0.5 in)	20 of 100 (Routine)
Hvar	Croatia	Record low maximum temperature	21.9 C (71.4 F)	19 of 100 (Routine)
Morgantown 1	United States	Record daily precipitation	33.5 mm (1.3 in)	19 of 100 (Routine)
Innsbruck	Austria	Record low minimum temperature	4.1 C (39.4 F)	18 of 100 (Routine)
Yardley Chase	South Africa	Record daily precipitation	20.3 mm (0.8 in)	18 of 100 (Routine)
Middleburg	South Africa	Record daily precipitation	5.1 mm (0.20 in)	18 of 100 (Routine)
Portland	Australia	Record daily precipitation	20.6 mm (0.8 in)	17 of 100 (Routine)
Orillia	Canada	Record daily precipitation	50.5 mm (2.0 in)	16 of 100 (Routine)
Jansenville	South Africa	Record daily precipitation	5.1 mm (0.20 in)	16 of 100 (Routine)
Roma Post Office	Australia	Record daily precipitation	6.4 mm (0.25 in)	15 of 100 (Routine)
Stonecliffe	Canada	Record daily precipitation	29.5 mm (1.2 in)	15 of 100 (Routine)
Freiburg	Germany	Record low minimum temperature	5.2 C (41.4 F)	15 of 100 (Routine)
Komga (Pol)	South Africa	Record daily precipitation	21.3 mm (0.8 in)	15 of 100 (Routine)
Tylden "Tulden"	South Africa	Record daily precipitation	9.4 mm (0.37 in)	15 of 100 (Routine)
Qacu (Bos)	South Africa	Record daily precipitation	21.8 mm (0.9 in)	15 of 100 (Routine)
Buffelsfontein 14	South Africa	Record daily precipitation	17.8 mm (0.7 in)	15 of 100 (Routine)
Svenska Hogarna	Sweden	Record daily precipitation	37.6 mm (1.5 in)	15 of 100 (Routine)
Burlington	United States	Record daily precipitation	40.6 mm (1.6 in)	15 of 100 (Routine)
Dordrecht - Tnk 14	South Africa	Record daily precipitation	5.6 mm (0.22 in)	14 of 100 (Routine)
Kiev	Ukraine	Record daily precipitation	18.4 mm (0.7 in)	14 of 100 (Routine)
Portland Rfc City	United States	Record high minimum temperature	17.8 C (64.0 F)	14 of 100 (Routine)
Hvar	Croatia	Record low minimum temperature	15.3 C (59.5 F)	13 of 100 (Routine)
Herschel	South Africa	Record daily precipitation	8.9 mm (0.35 in)	13 of 100 (Routine)
Ft Bidwell	United States	Record high maximum temperature	33.9 C (93.0 F)	13 of 100 (Routine)
North Bruce	Canada	Record daily precipitation	23.9 mm (0.9 in)	12 of 100 (Routine)
Munchen-Nymphenburg	Germany	Record low minimum temperature	6.9 C (44.4 F)	12 of 100 (Routine)
Astoria	United States	Record high maximum temperature	30.0 C (86.0 F)	12 of 100 (Routine)
Dalby Post Office	Australia	Record daily precipitation	8.9 mm (0.35 in)	11 of 100 (Routine)
Pointe Au Pere	Canada	Record high maximum temperature	23.9 C (75.0 F)	11 of 100 (Routine)
Gravenhurst	Canada	Record daily precipitation	23.4 mm (0.9 in)	10 of 100 (Routine)
Leyburn Post Office	Australia	Record daily precipitation	10.2 mm (0.4 in)	9 of 100 (Routine)
Lucknow	Canada	Record daily precipitation	11.9 mm (0.5 in)	9 of 100 (Routine)
Pittsworth	Australia	Record daily precipitation	12.2 mm (0.5 in)	8 of 100 (Routine)
Northfield	United States	Record daily precipitation	14.5 mm (0.6 in)	8 of 100 (Routine)
Astana	Kazakhstan	Record daily precipitation	3.6 mm (0.14 in)	7 of 100 (Routine)
Waverley	South Africa	Record daily precipitation	25.9 mm (1.0 in)	4 of 100 (Routine)
Kvikkjokk-Arrenjarka	Sweden	Record low minimum temperature	-4.0 C (24.8 F)	4 of 100 (Routine)
Vanersborg	Sweden	Record low minimum temperature	3.5 C (38.3 F)	4 of 100 (Routine)
Mount Gambier Post Office	Australia	Record daily precipitation	17.0 mm (0.7 in)	3 of 100 (Routine)
Winnemucca AP	United States	Record high maximum temperature	33.9 C (93.0 F)	3 of 100 (Routine)
Portland Rfc City	United States	Record high maximum temperature	34.4 C (93.9 F)	2 of 100 (Routine)
Tambo Post Office	Australia	Record daily precipitation	0.8 mm (0.03 in)	1 of 100 (Routine)
Stornoway Airport	United Kingdom	Record low maximum temperature	11.1 C (52.0 F)	1 of 100 (Routine)

Counts by Type and Timescale

58 records

Records set or tied on 31 August 1918 by type: Highest daily maximum 5, Lowest daily maximum 2, Highest daily minimum 2, Lowest daily minimum 7, Heaviest daily rainfall 42.

Records on 31 August 1918 by type
Record type	Records
Highest daily maximum	5
Lowest daily maximum	2
Highest daily minimum	2
Lowest daily minimum	7
Heaviest daily rainfall	42
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 31 August 1918 by timescale: all-time 0, monthly 4, daily 54.

How Much Records Were Beaten By

50 broken records

Margins by which the 50 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 49.5. Ties are not counted.

Top 20 by Significance

31 August 1918

Top 20 records on 31 August 1918 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
31 August 1918	Lock #4, US	daily rain	65.5 mm (2.6 in)	49.5 mm (1.9 in)	31 years	52 of 100 (Notable)
31 August 1918	Nelson, AU	daily rain	26.2 mm (1.0 in)	9.7 mm (0.38 in)	29 years	31 of 100 (Routine)
31 August 1918	Southampton, CA	daily rain	31.5 mm (1.2 in)	12.2 mm (0.5 in)	40 years	30 of 100 (Routine)
31 August 1918	Cape Northumberland, AU	daily rain	27.2 mm (1.1 in)	7.4 mm (0.29 in)	27 years	27 of 100 (Routine)
31 August 1918	Milan, IT	daily low min	10.3 C (50.5 F)	0.1 C (0.2 F)	58 years	27 of 100 (Routine)
31 August 1918	Harnosand, SE	daily rain	38.3 mm (1.5 in)	13.1 mm (0.5 in)	16 years	23 of 100 (Routine)
31 August 1918	Astoria, US	daily high min	17.8 C (64.0 F)	2.2 C (4.0 F)	29 years	23 of 100 (Routine)
31 August 1918	Steynsburg, ZA	daily rain	16.5 mm (0.6 in)	14.2 mm (0.6 in)	29 years	20 of 100 (Routine)
31 August 1918	Ellesmere, ZA	daily rain	22.1 mm (0.9 in)	16.8 mm (0.7 in)	29 years	20 of 100 (Routine)
31 August 1918	Tarkastad (Pol), ZA	daily rain	19.1 mm (0.8 in)	12.2 mm (0.5 in)	29 years	20 of 100 (Routine)
31 August 1918	Coldwater, CA	daily rain	21.1 mm (0.8 in)	15.5 mm (0.6 in)	25 years	20 of 100 (Routine)
31 August 1918	Sterkstroom (Pol), ZA	daily rain	16.3 mm (0.6 in)	14.0 mm (0.6 in)	8 years	20 of 100 (Routine)
31 August 1918	Burrawang South Station, AU	daily rain	24.6 mm (1.0 in)	7.1 mm (0.28 in)	30 years	20 of 100 (Routine)
31 August 1918	Colesberg (Tnk), ZA	daily rain	10.7 mm (0.4 in)	7.7 mm (0.30 in)	32 years	20 of 100 (Routine)
31 August 1918	Cradock, ZA	daily rain	19.8 mm (0.8 in)	5.3 mm (0.21 in)	29 years	20 of 100 (Routine)
31 August 1918	Philipstown (Tnk), ZA	daily rain	13.2 mm (0.5 in)	6.8 mm (0.27 in)	32 years	20 of 100 (Routine)
31 August 1918	Hvar, HR	daily low max	21.9 C (71.4 F)	1.3 C (2.3 F)	33 years	19 of 100 (Routine)
31 August 1918	Morgantown 1, US	daily rain	33.5 mm (1.3 in)	16.5 mm (0.6 in)	8 years	19 of 100 (Routine)
31 August 1918	Innsbruck, AT	daily low min	4.1 C (39.4 F)	0.9 C (1.6 F)	36 years	18 of 100 (Routine)
31 August 1918	Yardley Chase, ZA	daily rain	20.3 mm (0.8 in)	4.3 mm (0.17 in)	29 years	18 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 1918

Records set or tied on this calendar date in each year from 1796 to 1918. 1918 had 58 records.

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

Records on 08-31 in each year
Year	Records
1796	1
1806	1
1807	2
1813	1
1814	1
1816	1
1827	1
1836	1
1846	1
1849	1
1851	1
1856	2
1858	1
1859	1
1860	1
1861	1
1863	1
1867	1
1869	1
1873	1
1875	1
1876	1
1877	2
1879	2
1881	3
1882	2
1885	1
1886	5
1887	1
1889	1
1890	2
1892	3
1893	1
1894	1
1895	1
1896	1
1897	5
1898	10
1899	4
1900	3
1901	5
1902	5
1903	16
1904	13
1905	8
1906	47
1907	6
1908	12
1909	39
1910	20
1911	31
1912	34
1913	40
1914	23
1915	71
1916	7
1917	60
1918	58
1919	25
1920	46
1921	86
1922	58
1923	63
1924	232
1925	111
1926	148
1927	103
1928	201
1929	300
1930	243
1931	192
1932	807
1933	424
1934	381
1935	540
1936	226
1937	508
1938	324
1939	296
1940	400
1941	528
1942	422
1943	650
1944	638
1945	572
1946	545
1947	473
1948	367
1949	409
1950	662
1951	910
1952	388
1953	1,054
1954	633
1955	539
1956	734
1957	317
1958	417
1959	496
1960	366
1961	625
1962	432
1963	415
1964	591
1965	886
1966	830
1967	952
1968	562
1969	474
1970	558
1971	326
1972	287
1973	793
1974	587
1975	658
1976	732
1977	621
1978	891
1979	400
1980	701
1981	692
1982	586
1983	788
1984	866
1985	854
1986	1,218
1987	836
1988	570
1989	622
1990	966
1991	848
1992	1,274
1993	1,286
1994	1,139
1995	1,077
1996	1,451
1997	943
1998	1,163
1999	988
2000	1,545
2001	944
2002	852
2003	1,232
2004	963
2005	1,782
2006	1,147
2007	1,110
2008	870
2009	1,224
2010	1,490
2011	994
2012	932
2013	771
2014	458
2015	1,074
2016	599
2017	596
2018	366
2019	781
2020	737
2021	553
2022	1,191
2023	600
2024	766
2025	307
2026	595

Download the Data

Data for records on 1918-08-31: 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).

Histogram of margins by which records were beaten on 31 August 1918
Margin	Records
0 to 10	40
10 to 20	9
20 to 30	0
30 to 40	0
40 to 50	1