Weather Records on 18 September 1948

427 weather records were set or tied worldwide on 18 September 1948. Highest significance: Coonamble (Warrana), AU.

Key Facts for 18 September 1948

On 18 September 1948, 427 weather records were set or tied at long-record stations worldwide.
292 were record highs and 33 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 4 monthly and 423 daily.
Coonamble (Warrana) set a daily record precipitation of 60.5 mm (2.4 in) on 18 September 1948.
Across 163 earlier years (1803 to 2026) the same calendar date averaged 421 records.

Record Map

427 stations

427 station records on 18 September 1948 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 September 1948: highest significance records shown on the map
Station	Country	Type	Value	Significance
Coonamble (Warrana)	Australia	Record daily precipitation	60.5 mm (2.4 in)	61 of 100 (Major)
Teresina	Brazil	Record daily precipitation	73.0 mm (2.9 in)	49 of 100 (Notable)
Port Dover	Canada	Record daily precipitation	34.0 mm (1.3 in)	38 of 100 (Notable)
Gabriels	United States	Record daily precipitation	50.8 mm (2.0 in)	36 of 100 (Notable)
Coldwater	Canada	Record daily precipitation	45.0 mm (1.8 in)	35 of 100 (Notable)
Warrumbungle (Walla Walla)	Australia	Record daily precipitation	33.0 mm (1.3 in)	34 of 100 (Routine)
Lares	Puerto Rico [United States]	Record low maximum temperature	27.8 C (82.0 F)	33 of 100 (Routine)
Raymondville	United States	Record daily precipitation	61.0 mm (2.4 in)	33 of 100 (Routine)
Tadoussac	Canada	Record daily precipitation	38.1 mm (1.5 in)	32 of 100 (Routine)
Samnanger	Norway	Record daily precipitation	106.5 mm (4.2 in)	30 of 100 (Routine)
Goderich	Canada	Record high minimum temperature	20.6 C (69.1 F)	29 of 100 (Routine)
Woodstock	Canada	Record high minimum temperature	18.9 C (66.0 F)	29 of 100 (Routine)
Guelph Oac	Canada	Record high minimum temperature	20.6 C (69.1 F)	28 of 100 (Routine)
Urvakonda	India	Record daily precipitation	92.7 mm (3.6 in)	28 of 100 (Routine)
Haiku 490	United States	Record low minimum temperature	15.6 C (60.1 F)	28 of 100 (Routine)
Sedgefield (Bundajon)	Australia	Record daily precipitation	26.7 mm (1.1 in)	27 of 100 (Routine)
Ottawa Cda	Canada	Record high minimum temperature	20.0 C (68.0 F)	27 of 100 (Routine)
Cape May 2 NW	United States	Record high minimum temperature	23.9 C (75.0 F)	27 of 100 (Routine)
Rafiganj	India	Record daily precipitation	56.4 mm (2.2 in)	26 of 100 (Routine)
Setauket Strong	United States	Record high maximum temperature	30.6 C (87.1 F)	25 of 100 (Routine)
Grants Pass	United States	Record high minimum temperature	12.8 C (55.0 F)	25 of 100 (Routine)
Weaverville	United States	Record daily precipitation	26.4 mm (1.0 in)	24 of 100 (Routine)
Meeker	United States	Record high maximum temperature	30.6 C (87.1 F)	24 of 100 (Routine)
Richfield	United States	Record daily precipitation	30.7 mm (1.2 in)	24 of 100 (Routine)
Berlin	United States	Record low minimum temperature	-2.2 C (28.0 F)	24 of 100 (Routine)
Santa Fe	United States	Record high maximum temperature	30.6 C (87.1 F)	24 of 100 (Routine)
Viroqua	United States	Record high minimum temperature	21.1 C (70.0 F)	24 of 100 (Routine)
Sable Island	Canada	Record low minimum temperature	5.0 C (41.0 F)	23 of 100 (Routine)
McCloud	United States	Record daily precipitation	34.5 mm (1.4 in)	23 of 100 (Routine)
Belle Plaine	United States	Record high minimum temperature	22.2 C (72.0 F)	23 of 100 (Routine)
Bemidji	United States	Record high maximum temperature	31.7 C (89.1 F)	23 of 100 (Routine)
Grand Meadow	United States	Record high minimum temperature	20.0 C (68.0 F)	23 of 100 (Routine)
Cidra 1 E	Puerto Rico [United States]	Record daily precipitation	57.2 mm (2.3 in)	22 of 100 (Routine)
Logan 1 WNW	United States	Record high maximum temperature	36.7 C (98.1 F)	22 of 100 (Routine)
Webster City	United States	Record high minimum temperature	20.6 C (69.1 F)	22 of 100 (Routine)
Hyannis	United States	Record high maximum temperature	28.9 C (84.0 F)	22 of 100 (Routine)
E Tawas	United States	Record high maximum temperature	32.2 C (90.0 F)	22 of 100 (Routine)
Alfred	United States	Record high minimum temperature	16.7 C (62.1 F)	22 of 100 (Routine)
Bowling Green Wwtp	United States	Record high minimum temperature	20.0 C (68.0 F)	22 of 100 (Routine)
Bedford 2 SE	United States	Record daily precipitation	26.7 mm (1.1 in)	22 of 100 (Routine)
Lakefield	Canada	Record high minimum temperature	17.8 C (64.0 F)	21 of 100 (Routine)
Tonteldoos	South Africa	Record daily precipitation	25.7 mm (1.0 in)	21 of 100 (Routine)
Ukiah	United States	Record high minimum temperature	14.4 C (57.9 F)	21 of 100 (Routine)
Afton	United States	Record high maximum temperature	33.9 C (93.0 F)	21 of 100 (Routine)
Decorah	United States	Record high minimum temperature	21.1 C (70.0 F)	21 of 100 (Routine)
Toledo 3N	United States	Record high minimum temperature	22.2 C (72.0 F)	21 of 100 (Routine)
Montpelier	United States	Record high minimum temperature	20.6 C (69.1 F)	21 of 100 (Routine)
Oconto 4 W	United States	Record high minimum temperature	18.3 C (64.9 F)	21 of 100 (Routine)
Sheboygan	United States	Record high maximum temperature	32.8 C (91.0 F)	21 of 100 (Routine)
Hazelton	United States	Record daily precipitation	20.1 mm (0.8 in)	20 of 100 (Routine)
Elatma	Russia	Record daily precipitation	22.8 mm (0.9 in)	20 of 100 (Routine)
Machadodorp	South Africa	Record daily precipitation	17.3 mm (0.7 in)	20 of 100 (Routine)
Carmichael (Tnk)	South Africa	Record daily precipitation	24.9 mm (1.0 in)	20 of 100 (Routine)
Storlien	Sweden	Record daily precipitation	21.0 mm (0.8 in)	20 of 100 (Routine)
Oakley	United States	Record daily precipitation	14.2 mm (0.6 in)	20 of 100 (Routine)
Bream Creek (Stroud)	Australia	Record daily precipitation	23.9 mm (0.9 in)	20 of 100 (Routine)
Irwin 2 SE	United States	Record daily precipitation	19.6 mm (0.8 in)	20 of 100 (Routine)
Urawilkie	Australia	Record daily precipitation	6.9 mm (0.27 in)	20 of 100 (Routine)
Coonamble Comparison	Australia	Record daily precipitation	18.5 mm (0.7 in)	20 of 100 (Routine)
Neilrex (Caigan)	Australia	Record daily precipitation	17.8 mm (0.7 in)	20 of 100 (Routine)

Counts by Type and Timescale

427 records

Records set or tied on 18 September 1948 by type: Highest daily maximum 122, Lowest daily maximum 14, Highest daily minimum 170, Lowest daily minimum 19, Heaviest daily rainfall 102.

Records on 18 September 1948 by type
Record type	Records
Highest daily maximum	122
Lowest daily maximum	14
Highest daily minimum	170
Lowest daily minimum	19
Heaviest daily rainfall	102
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 18 September 1948 by timescale: all-time 0, monthly 4, daily 423.

How Much Records Were Beaten By

303 broken records

Margins by which the 303 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 54.1. Ties are not counted.

Top 20 by Significance

18 September 1948

Top 20 records on 18 September 1948 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 September 1948	Coonamble (Warrana), AU	daily rain	60.5 mm (2.4 in)	54.1 mm (2.1 in)	52 years	61 of 100 (Major)
18 September 1948	Teresina, BR	monthly rain	73.0 mm (2.9 in)	29.0 mm (1.1 in)	25 years	49 of 100 (Notable)
18 September 1948	Port Dover, CA	daily rain	34.0 mm (1.3 in)	8.9 mm (0.35 in)	71 years	38 of 100 (Notable)
18 September 1948	Gabriels, US	daily rain	50.8 mm (2.0 in)	22.9 mm (0.9 in)	36 years	36 of 100 (Notable)
18 September 1948	Coldwater, CA	daily rain	45.0 mm (1.8 in)	19.6 mm (0.8 in)	40 years	35 of 100 (Notable)
18 September 1948	Warrumbungle (Walla Walla), AU	daily rain	33.0 mm (1.3 in)	22.1 mm (0.9 in)	33 years	34 of 100 (Routine)
18 September 1948	Lares, PR	daily low max	27.8 C (82.0 F)	2.2 C (4.0 F)	45 years	33 of 100 (Routine)
18 September 1948	Raymondville, US	daily rain	61.0 mm (2.4 in)	43.0 mm (1.7 in)	30 years	33 of 100 (Routine)
18 September 1948	Tadoussac, CA	daily rain	38.1 mm (1.5 in)	23.6 mm (0.9 in)	13 years	32 of 100 (Routine)
18 September 1948	Samnanger, NO	daily rain	106.5 mm (4.2 in)	39.3 mm (1.5 in)	20 years	30 of 100 (Routine)
18 September 1948	Goderich, CA	daily high min	20.6 C (69.1 F)	0.6 C (1.1 F)	67 years	29 of 100 (Routine)
18 September 1948	Woodstock, CA	daily high min	18.9 C (66.0 F)	1.7 C (3.1 F)	65 years	29 of 100 (Routine)
18 September 1948	Guelph Oac, CA	daily high min	20.6 C (69.1 F)	1.7 C (3.1 F)	65 years	28 of 100 (Routine)
18 September 1948	Urvakonda, IN	daily rain	92.7 mm (3.6 in)	36.1 mm (1.4 in)	17 years	28 of 100 (Routine)
18 September 1948	Haiku 490, US	daily low min	15.6 C (60.1 F)	2.2 C (4.0 F)	21 years	28 of 100 (Routine)
18 September 1948	Sedgefield (Bundajon), AU	daily rain	26.7 mm (1.1 in)	20.1 mm (0.8 in)	27 years	27 of 100 (Routine)
18 September 1948	Ottawa Cda, CA	daily high min	20.0 C (68.0 F)	2.2 C (4.0 F)	56 years	27 of 100 (Routine)
18 September 1948	Cape May 2 NW, US	daily high min	23.9 C (75.0 F)	1.7 C (3.1 F)	53 years	27 of 100 (Routine)
18 September 1948	Rafiganj, IN	daily rain	56.4 mm (2.2 in)	38.9 mm (1.5 in)	32 years	26 of 100 (Routine)
18 September 1948	Setauket Strong, US	daily high max	30.6 C (87.1 F)	2.8 C (5.0 F)	42 years	25 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

1803 to 1948

Records set or tied on this calendar date in each year from 1803 to 1948. 1948 had 427 records.

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

Records on 09-18 in each year
Year	Records
1803	1
1811	1
1814	1
1819	1
1829	1
1832	1
1834	1
1835	1
1837	2
1847	2
1848	1
1849	1
1851	4
1859	1
1861	1
1865	1
1869	1
1871	1
1875	1
1876	2
1877	1
1879	1
1880	1
1881	1
1882	1
1885	1
1886	4
1889	6
1890	1
1891	1
1893	4
1894	2
1895	2
1896	4
1897	3
1898	5
1899	3
1900	2
1901	10
1902	8
1903	58
1904	6
1905	22
1906	16
1907	4
1908	11
1909	17
1910	5
1911	8
1912	43
1913	44
1914	56
1915	41
1916	58
1917	99
1918	57
1919	48
1920	56
1921	213
1922	45
1923	114
1924	62
1925	269
1926	205
1927	189
1928	114
1929	309
1930	124
1931	429
1932	226
1933	370
1934	188
1935	281
1936	155
1937	422
1938	373
1939	190
1940	402
1941	318
1942	1,001
1943	624
1944	503
1945	732
1946	576
1947	927
1948	427
1949	356
1950	370
1951	320
1952	340
1953	245
1954	446
1955	672
1956	587
1957	429
1958	491
1959	829
1960	351
1961	478
1962	360
1963	453
1964	282
1965	1,172
1966	498
1967	357
1968	763
1969	424
1970	377
1971	1,245
1972	691
1973	593
1974	559
1975	976
1976	615
1977	619
1978	1,162
1979	709
1980	652
1981	1,671
1982	603
1983	936
1984	951
1985	636
1986	730
1987	1,244
1988	997
1989	778
1990	904
1991	1,377
1992	821
1993	747
1994	852
1995	935
1996	1,237
1997	935
1998	1,038
1999	583
2000	1,146
2001	993
2002	828
2003	815
2004	1,027
2005	781
2006	1,309
2007	670
2008	697
2009	692
2010	1,040
2011	1,050
2012	922
2013	666
2014	682
2015	934
2016	893
2017	518
2018	1,200
2019	768
2020	682
2021	582
2022	613
2023	639
2024	687
2025	471
2026	864

Download the Data

Data for records on 1948-09-18: 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	272
10 to 20	17
20 to 30	7
30 to 40	5
40 to 50	1
50 to 60	1