Weather Records on 18 September 1929

309 weather records were set or tied worldwide on 18 September 1929. Highest significance: Sydney, CA.

Key Facts for 18 September 1929

On 18 September 1929, 309 weather records were set or tied at long-record stations worldwide.
31 were record highs and 249 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 10 monthly and 299 daily.
Sydney set a monthly record high minimum temperature of 19.4 C (66.9 F) on 18 September 1929.
Across 163 earlier years (1803 to 2026) the same calendar date averaged 422 records.

Record Map

309 stations

309 station records on 18 September 1929 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 September 1929: highest significance records shown on the map
Station	Country	Type	Value	Significance
Sydney	Canada	Record high minimum temperature	19.4 C (66.9 F)	28 of 100 (Routine)
Oakbank	Canada	Record low minimum temperature	-7.8 C (18.0 F)	24 of 100 (Routine)
Storlien	Sweden	Record high minimum temperature	9.0 C (48.2 F)	24 of 100 (Routine)
Alton	Canada	Record low maximum temperature	7.8 C (46.0 F)	23 of 100 (Routine)
Kirchdorf/Poel	Germany	Record high maximum temperature	25.0 C (77.0 F)	23 of 100 (Routine)
San Jacinto	United States	Record daily precipitation	30.5 mm (1.2 in)	22 of 100 (Routine)
Grand Forks UNIV (NWS)	United States	Record low minimum temperature	-7.8 C (18.0 F)	22 of 100 (Routine)
Jamestown State Hosp	United States	Record low minimum temperature	-9.4 C (15.1 F)	22 of 100 (Routine)
Crookston NW Exp STN	United States	Record low minimum temperature	-7.8 C (18.0 F)	21 of 100 (Routine)
Boonton 1 SE	United States	Record daily precipitation	30.7 mm (1.2 in)	21 of 100 (Routine)
Clarksville	United States	Record daily precipitation	27.9 mm (1.1 in)	21 of 100 (Routine)
Park Rapids Muni AP	United States	Record low minimum temperature	-7.2 C (19.0 F)	21 of 100 (Routine)
Hopetown (Tnk)	South Africa	Record daily precipitation	24.1 mm (0.9 in)	20 of 100 (Routine)
Claremont Pomona Clg	United States	Record daily precipitation	14.0 mm (0.6 in)	20 of 100 (Routine)
Sierra Madre Henszey	United States	Record daily precipitation	15.5 mm (0.6 in)	20 of 100 (Routine)
Biskra	Algeria	Record daily precipitation	1.1 mm (0.04 in)	20 of 100 (Routine)
Kingston Queens U	Canada	Record low maximum temperature	12.8 C (55.0 F)	20 of 100 (Routine)
Windsor Kings College	Canada	Record daily precipitation	34.3 mm (1.4 in)	20 of 100 (Routine)
Ft Stanton	United States	Record daily precipitation	26.2 mm (1.0 in)	20 of 100 (Routine)
Savanne	Canada	Record daily snowfall	1.3 cm (0.5 in)	19 of 100 (Routine)
San Bernardino F S 226	United States	Record daily precipitation	13.2 mm (0.5 in)	19 of 100 (Routine)
Columbus Dardc	United States	Record daily precipitation	21.3 mm (0.8 in)	19 of 100 (Routine)
Marshallville 6 S	United States	Record daily precipitation	40.6 mm (1.6 in)	19 of 100 (Routine)
Humboldt 3 W	United States	Record low minimum temperature	-3.9 C (25.0 F)	19 of 100 (Routine)
Hallock	United States	Record low minimum temperature	-8.9 C (16.0 F)	19 of 100 (Routine)
Brandon Cda	Canada	Record low minimum temperature	-8.9 C (16.0 F)	18 of 100 (Routine)
Bancroft	Canada	Record low maximum temperature	8.9 C (48.0 F)	18 of 100 (Routine)
Detroit Lakes 1 NNE	United States	Record low minimum temperature	-8.3 C (17.1 F)	18 of 100 (Routine)
Farmington 3NW	United States	Record low minimum temperature	-2.2 C (28.0 F)	18 of 100 (Routine)
New Ulm 2 SE	United States	Record low minimum temperature	-3.9 C (25.0 F)	18 of 100 (Routine)
Lockport 2SE	United States	Record low minimum temperature	1.7 C (35.1 F)	18 of 100 (Routine)
Robe Comparison	Australia	Record low minimum temperature	4.4 C (39.9 F)	17 of 100 (Routine)
Ottawa Cda	Canada	Record low maximum temperature	11.1 C (52.0 F)	17 of 100 (Routine)
Haliburton A	Canada	Record low maximum temperature	10.6 C (51.1 F)	17 of 100 (Routine)
Algona	United States	Record low minimum temperature	-2.8 C (27.0 F)	17 of 100 (Routine)
Alta	United States	Record low minimum temperature	-1.7 C (28.9 F)	17 of 100 (Routine)
Grand Meadow	United States	Record low minimum temperature	-3.9 C (25.0 F)	17 of 100 (Routine)
Pine Rvr Dam	United States	Record low minimum temperature	-6.1 C (21.0 F)	17 of 100 (Routine)
Grafton	United States	Record low minimum temperature	-6.7 C (19.9 F)	17 of 100 (Routine)
Pembina	United States	Record low minimum temperature	-7.2 C (19.0 F)	17 of 100 (Routine)
Lakefield	Canada	Record low maximum temperature	12.8 C (55.0 F)	16 of 100 (Routine)
Petrusville (Pol)	South Africa	Record daily precipitation	19.3 mm (0.8 in)	16 of 100 (Routine)
Odesa	Ukraine	Record daily precipitation	8.7 mm (0.34 in)	16 of 100 (Routine)
Mason City	United States	Record low minimum temperature	-3.3 C (26.1 F)	16 of 100 (Routine)
S Haven	United States	Record low minimum temperature	1.7 C (35.1 F)	16 of 100 (Routine)
Faribault	United States	Record low minimum temperature	-2.8 C (27.0 F)	16 of 100 (Routine)
Leech Lake	United States	Record low minimum temperature	-6.1 C (21.0 F)	16 of 100 (Routine)
Socorro	United States	Record low maximum temperature	21.7 C (71.1 F)	16 of 100 (Routine)
Alexandria 4 WSW	United States	Record low minimum temperature	-1.1 C (30.0 F)	16 of 100 (Routine)
Towanda 1 S	United States	Record low maximum temperature	14.4 C (57.9 F)	16 of 100 (Routine)
Clark	United States	Record low minimum temperature	-6.7 C (19.9 F)	16 of 100 (Routine)
Howard	United States	Record low maximum temperature	9.4 C (48.9 F)	16 of 100 (Routine)
Hallettsville 2 N	United States	Record high maximum temperature	38.9 C (102.0 F)	16 of 100 (Routine)
Cape Otway Lighthouse	Australia	Record low maximum temperature	10.3 C (50.5 F)	15 of 100 (Routine)
Port Arthur	Canada	Record low maximum temperature	7.8 C (46.0 F)	15 of 100 (Routine)
Rutherglen	Canada	Record low maximum temperature	6.7 C (44.1 F)	15 of 100 (Routine)
Bancroft	Canada	Record low minimum temperature	-6.1 C (21.0 F)	15 of 100 (Routine)
Sable Island	Canada	Record high minimum temperature	18.9 C (66.0 F)	15 of 100 (Routine)
Husum	Germany	Record high maximum temperature	25.9 C (78.6 F)	15 of 100 (Routine)
Tallahassee	United States	Record daily precipitation	33.0 mm (1.3 in)	15 of 100 (Routine)

Counts by Type and Timescale

309 records

Records set or tied on 18 September 1929 by type: Highest daily maximum 12, Lowest daily maximum 111, Highest daily minimum 19, Lowest daily minimum 138, Heaviest daily rainfall 28, Heaviest daily snowfall 1.

Records on 18 September 1929 by type
Record type	Records
Highest daily maximum	12
Lowest daily maximum	111
Highest daily minimum	19
Lowest daily minimum	138
Heaviest daily rainfall	28
Heaviest daily snowfall	1
Deepest snow cover	0

Records on 18 September 1929 by timescale: all-time 0, monthly 10, daily 299.

How Much Records Were Beaten By

219 broken records

Margins by which the 219 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 26.4. Ties are not counted.

Top 20 by Significance

18 September 1929

Top 20 records on 18 September 1929 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 September 1929	Sydney, CA	monthly high min	19.4 C (66.9 F)	0.5 C (0.9 F)	39 years	28 of 100 (Routine)
18 September 1929	Oakbank, CA	daily low min	-7.8 C (18.0 F)	5.6 C (10.1 F)	35 years	24 of 100 (Routine)
18 September 1929	Storlien, SE	daily high min	9.0 C (48.2 F)	2.0 C (3.6 F)	46 years	24 of 100 (Routine)
18 September 1929	Alton, CA	daily low max	7.8 C (46.0 F)	4.4 C (7.9 F)	39 years	23 of 100 (Routine)
18 September 1929	Kirchdorf/Poel, DE	daily high max	25.0 C (77.0 F)	3.5 C (6.3 F)	30 years	23 of 100 (Routine)
18 September 1929	San Jacinto, US	monthly rain	30.5 mm (1.2 in)	7.6 mm (0.30 in)	7 years	22 of 100 (Routine)
18 September 1929	Grand Forks UNIV (NWS), US	daily low min	-7.8 C (18.0 F)	8.4 C (15.1 F)	11 years	22 of 100 (Routine)
18 September 1929	Jamestown State Hosp, US	monthly low min	-9.4 C (15.1 F)	1.1 C (2.0 F)	21 years	22 of 100 (Routine)
18 September 1929	Crookston NW Exp STN, US	daily low min	-7.8 C (18.0 F)	5.0 C (9.0 F)	28 years	21 of 100 (Routine)
18 September 1929	Boonton 1 SE, US	daily rain	30.7 mm (1.2 in)	18.0 mm (0.7 in)	26 years	21 of 100 (Routine)
18 September 1929	Clarksville, US	daily rain	27.9 mm (1.1 in)	17.7 mm (0.7 in)	26 years	21 of 100 (Routine)
18 September 1929	Park Rapids Muni AP, US	monthly low min	-7.2 C (19.0 F)	0.5 C (0.9 F)	29 years	21 of 100 (Routine)
18 September 1929	Hopetown (Tnk), ZA	daily rain	24.1 mm (0.9 in)	19.5 mm (0.8 in)	36 years	20 of 100 (Routine)
18 September 1929	Claremont Pomona Clg, US	daily rain	14.0 mm (0.6 in)	14.0 mm (0.6 in)	34 years	20 of 100 (Routine)
18 September 1929	Sierra Madre Henszey, US	daily rain	15.5 mm (0.6 in)	15.5 mm (0.6 in)	31 years	20 of 100 (Routine)
18 September 1929	Biskra, DZ	daily rain	1.1 mm (0.04 in)	1.1 mm (0.04 in)	48 years	20 of 100 (Routine)
18 September 1929	Kingston Queens U, CA	daily low max	12.8 C (55.0 F)	0.5 C (0.9 F)	49 years	20 of 100 (Routine)
18 September 1929	Windsor Kings College, CA	daily rain	34.3 mm (1.4 in)	10.2 mm (0.4 in)	19 years	20 of 100 (Routine)
18 September 1929	Ft Stanton, US	daily rain	26.2 mm (1.0 in)	14.8 mm (0.6 in)	19 years	20 of 100 (Routine)
18 September 1929	Savanne, CA	daily snowfall	1.3 cm (0.5 in)	1.3 cm (0.5 in)	43 years	19 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 1929

Records set or tied on this calendar date in each year from 1803 to 1929. 1929 had 309 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 1929-09-18: 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 5	199
5 to 10	7
10 to 15	8
15 to 20	4
20 to 25	0
25 to 30	1