Weather Records on 17 April 1921

148 weather records were set or tied worldwide on 17 April 1921. Highest significance: Toronto, CA.

Key Facts for 17 April 1921

On 17 April 1921, 148 weather records were set or tied at long-record stations worldwide.
8 were record highs and 43 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 1 monthly and 147 daily.
Toronto set a daily record snowfall of 9.1 cm (3.6 in) on 17 April 1921.
Across 166 earlier years (1799 to 2026) the same calendar date averaged 454 records.

Record Map

148 stations

148 station records on 17 April 1921 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 April 1921: highest significance records shown on the map
Station	Country	Type	Value	Significance
Toronto	Canada	Record daily snowfall	9.1 cm (3.6 in)	44 of 100 (Notable)
Clinton	United States	Record daily precipitation	66.0 mm (2.6 in)	42 of 100 (Notable)
Chatham 2	Canada	Record daily snowfall	10.2 cm (4.0 in)	35 of 100 (Notable)
Westminster	Canada	Record daily snowfall	10.2 cm (4.0 in)	35 of 100 (Notable)
Port Stanley	Canada	Record daily snowfall	10.2 cm (4.0 in)	34 of 100 (Routine)
Asheville Pearson St	United States	Record daily precipitation	40.6 mm (1.6 in)	30 of 100 (Routine)
Toledo Blade	United States	Record daily snowfall	14.0 cm (5.5 in)	30 of 100 (Routine)
Wiarton	Canada	Record daily snowfall	15.2 cm (6.0 in)	29 of 100 (Routine)
Paris	Canada	Record daily snowfall	7.6 cm (3.0 in)	28 of 100 (Routine)
Toronto Deer Park	Canada	Record daily snowfall	8.9 cm (3.5 in)	28 of 100 (Routine)
Hamilton	Canada	Record low maximum temperature	1.1 C (34.0 F)	25 of 100 (Routine)
Houston Wb City	United States	Record low minimum temperature	4.4 C (39.9 F)	24 of 100 (Routine)
Herschel	South Africa	Record daily precipitation	27.4 mm (1.1 in)	23 of 100 (Routine)
Paris	Canada	Record daily precipitation	28.4 mm (1.1 in)	22 of 100 (Routine)
Murphy 4ESE	United States	Record daily precipitation	50.8 mm (2.0 in)	22 of 100 (Routine)
Rogersville 1 NE	United States	Record daily precipitation	32.3 mm (1.3 in)	22 of 100 (Routine)
Peterborough	Canada	Record daily snowfall	6.4 cm (2.5 in)	21 of 100 (Routine)
Toledo Blade	United States	Record daily precipitation	29.2 mm (1.1 in)	21 of 100 (Routine)
Willaura (Yarram Park)	Australia	Record daily precipitation	23.1 mm (0.9 in)	20 of 100 (Routine)
Cleveland 2717 Euclid	United States	Record daily precipitation	24.1 mm (0.9 in)	20 of 100 (Routine)
Port Campbell Post Office	Australia	Record daily precipitation	17.5 mm (0.7 in)	20 of 100 (Routine)
Beales Reservoir	Australia	Record daily precipitation	22.9 mm (0.9 in)	20 of 100 (Routine)
Malmsbury Reservoir	Australia	Record daily precipitation	11.4 mm (0.4 in)	20 of 100 (Routine)
Port Fairy (Griffiths Island)	Australia	Record daily precipitation	11.9 mm (0.5 in)	20 of 100 (Routine)
Ottawa	Canada	Record daily snowfall	3.6 cm (1.4 in)	20 of 100 (Routine)
Guelph Oac	Canada	Record daily precipitation	24.1 mm (0.9 in)	20 of 100 (Routine)
Casterton (Warrock)	Australia	Record daily precipitation	13.7 mm (0.5 in)	20 of 100 (Routine)
Meningie	Australia	Record daily precipitation	7.6 mm (0.30 in)	20 of 100 (Routine)
Cornwall	United States	Record daily precipitation	21.6 mm (0.9 in)	20 of 100 (Routine)
Stoney Creek	Canada	Record daily snowfall	2.5 cm (1.0 in)	19 of 100 (Routine)
Northfield	United States	Record daily precipitation	15.0 mm (0.6 in)	19 of 100 (Routine)
Houston Wb City	United States	Record low maximum temperature	15.6 C (60.1 F)	19 of 100 (Routine)
Nhill	Australia	Record daily precipitation	10.2 mm (0.4 in)	18 of 100 (Routine)
Cape Schanck Lighthouse	Australia	Record daily precipitation	10.7 mm (0.4 in)	18 of 100 (Routine)
Cowes	Australia	Record daily precipitation	18.5 mm (0.7 in)	18 of 100 (Routine)
Mirranatwa (Bullawin Park)	Australia	Record daily precipitation	15.7 mm (0.6 in)	18 of 100 (Routine)
Kingston Queens U	Canada	Record low maximum temperature	0.6 C (33.1 F)	18 of 100 (Routine)
Toronto Deer Park	Canada	Record daily precipitation	25.9 mm (1.0 in)	18 of 100 (Routine)
Bamberg	Germany	Record low minimum temperature	-5.3 C (22.5 F)	18 of 100 (Routine)
Little Rock St Capitol	United States	Record low minimum temperature	1.1 C (34.0 F)	18 of 100 (Routine)
Mena	United States	Record low minimum temperature	-1.7 C (28.9 F)	18 of 100 (Routine)
Kyneton Post Office	Australia	Record daily precipitation	12.4 mm (0.5 in)	17 of 100 (Routine)
Lindsay	Canada	Record low maximum temperature	1.7 C (35.1 F)	17 of 100 (Routine)
Vineland	United States	Record high minimum temperature	16.1 C (61.0 F)	17 of 100 (Routine)
Apsley	Australia	Record daily precipitation	11.4 mm (0.4 in)	16 of 100 (Routine)
Koroit	Australia	Record daily precipitation	15.2 mm (0.6 in)	16 of 100 (Routine)
London South	Canada	Record low maximum temperature	0.0 C (32.0 F)	16 of 100 (Routine)
Bathurst Gaol	Australia	Record high minimum temperature	13.3 C (55.9 F)	15 of 100 (Routine)
Bright Post Office	Australia	Record daily precipitation	15.0 mm (0.6 in)	15 of 100 (Routine)
Fryerstown	Australia	Record daily precipitation	7.4 mm (0.29 in)	15 of 100 (Routine)
Streatham (Pretty Tower)	Australia	Record daily precipitation	13.2 mm (0.5 in)	15 of 100 (Routine)
Hoburg	Sweden	Record daily precipitation	2.7 mm (0.11 in)	15 of 100 (Routine)
Prescott 2 NNW	United States	Record low minimum temperature	-0.6 C (30.9 F)	15 of 100 (Routine)
Bulgandra	Australia	Record daily precipitation	7.4 mm (0.29 in)	14 of 100 (Routine)
Springfield 3	Australia	Record daily precipitation	3.3 mm (0.13 in)	14 of 100 (Routine)
Lillimur Estate	Australia	Record daily precipitation	10.2 mm (0.4 in)	14 of 100 (Routine)
Nhill (Woorak)	Australia	Record daily precipitation	11.7 mm (0.5 in)	14 of 100 (Routine)
Crowlands (Woodlands)	Australia	Record daily precipitation	10.2 mm (0.4 in)	14 of 100 (Routine)
Yarrawalla South	Australia	Record daily precipitation	4.1 mm (0.16 in)	14 of 100 (Routine)
Myrniong	Australia	Record daily precipitation	10.2 mm (0.4 in)	14 of 100 (Routine)

Counts by Type and Timescale

148 records

Records set or tied on 17 April 1921 by type: Highest daily maximum 2, Lowest daily maximum 23, Highest daily minimum 6, Lowest daily minimum 20, Heaviest daily rainfall 77, Heaviest daily snowfall 19, Deepest snow cover 1.

Records on 17 April 1921 by type
Record type	Records
Highest daily maximum	2
Lowest daily maximum	23
Highest daily minimum	6
Lowest daily minimum	20
Heaviest daily rainfall	77
Heaviest daily snowfall	19
Deepest snow cover	1

Records on 17 April 1921 by timescale: all-time 0, monthly 1, daily 147.

How Much Records Were Beaten By

134 broken records

Margins by which the 134 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 127.0. Ties are not counted.

Top 20 by Significance

17 April 1921

Top 20 records on 17 April 1921 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 April 1921	Toronto, CA	daily snowfall	9.1 cm (3.6 in)	7.8 cm (3.1 in)	46 years	44 of 100 (Notable)
17 April 1921	Clinton, US	daily rain	66.0 mm (2.6 in)	46.9 mm (1.8 in)	20 years	42 of 100 (Notable)
17 April 1921	Chatham 2, CA	daily snowfall	10.2 cm (4.0 in)	10.2 cm (4.0 in)	37 years	35 of 100 (Notable)
17 April 1921	Westminster, CA	daily snowfall	10.2 cm (4.0 in)	10.2 cm (4.0 in)	37 years	35 of 100 (Notable)
17 April 1921	Port Stanley, CA	daily snowfall	10.2 cm (4.0 in)	8.4 cm (3.3 in)	45 years	34 of 100 (Routine)
17 April 1921	Asheville Pearson St, US	daily rain	40.6 mm (1.6 in)	18.8 mm (0.7 in)	30 years	30 of 100 (Routine)
17 April 1921	Toledo Blade, US	monthly snowfall	14.0 cm (5.5 in)	2.6 cm (1.0 in)	28 years	30 of 100 (Routine)
17 April 1921	Wiarton, CA	daily snowfall	15.2 cm (6.0 in)	12.7 cm (5.0 in)	3 years	29 of 100 (Routine)
17 April 1921	Paris, CA	daily snowfall	7.6 cm (3.0 in)	7.6 cm (3.0 in)	36 years	28 of 100 (Routine)
17 April 1921	Toronto Deer Park, CA	daily snowfall	8.9 cm (3.5 in)	8.9 cm (3.5 in)	29 years	28 of 100 (Routine)
17 April 1921	Hamilton, CA	daily low max	1.1 C (34.0 F)	3.9 C (7.0 F)	47 years	25 of 100 (Routine)
17 April 1921	Houston Wb City, US	daily low min	4.4 C (39.9 F)	4.5 C (8.1 F)	37 years	24 of 100 (Routine)
17 April 1921	Herschel, ZA	daily rain	27.4 mm (1.1 in)	8.3 mm (0.33 in)	35 years	23 of 100 (Routine)
17 April 1921	Paris, CA	daily rain	28.4 mm (1.1 in)	7.1 mm (0.28 in)	26 years	22 of 100 (Routine)
17 April 1921	Murphy 4ESE, US	daily rain	50.8 mm (2.0 in)	24.9 mm (1.0 in)	11 years	22 of 100 (Routine)
17 April 1921	Rogersville 1 NE, US	daily rain	32.3 mm (1.3 in)	10.5 mm (0.4 in)	30 years	22 of 100 (Routine)
17 April 1921	Peterborough, CA	daily snowfall	6.4 cm (2.5 in)	1.3 cm (0.5 in)	47 years	21 of 100 (Routine)
17 April 1921	Toledo Blade, US	daily rain	29.2 mm (1.1 in)	10.1 mm (0.4 in)	8 years	21 of 100 (Routine)
17 April 1921	Willaura (Yarram Park), AU	daily rain	23.1 mm (0.9 in)	17.3 mm (0.7 in)	22 years	20 of 100 (Routine)
17 April 1921	Cleveland 2717 Euclid, US	daily rain	24.1 mm (0.9 in)	11.1 mm (0.4 in)	43 years	20 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

1799 to 1921

Records set or tied on this calendar date in each year from 1799 to 1921. 1921 had 148 records.

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

Records on 04-17 in each year
Year	Records
1799	1
1807	1
1808	1
1815	1
1817	1
1818	1
1819	1
1823	1
1825	1
1830	1
1835	3
1837	1
1845	1
1847	2
1851	1
1852	3
1853	1
1854	1
1855	1
1857	1
1858	1
1862	1
1865	2
1868	1
1873	4
1874	1
1875	3
1877	4
1878	2
1880	2
1889	1
1890	2
1891	2
1892	4
1894	5
1895	1
1896	5
1897	6
1898	3
1899	1
1900	2
1901	4
1902	4
1903	5
1904	19
1905	11
1906	14
1907	16
1908	38
1909	7
1910	29
1911	33
1912	27
1913	20
1914	83
1915	30
1916	30
1917	32
1918	35
1919	39
1920	87
1921	148
1922	96
1923	71
1924	74
1925	103
1926	140
1927	256
1928	308
1929	145
1930	238
1931	216
1932	615
1933	261
1934	234
1935	374
1936	308
1937	439
1938	564
1939	618
1940	337
1941	460
1942	415
1943	285
1944	334
1945	475
1946	492
1947	461
1948	622
1949	439
1950	293
1951	441
1952	529
1953	818
1954	650
1955	394
1956	486
1957	277
1958	702
1959	434
1960	553
1961	667
1962	597
1963	702
1964	766
1965	411
1966	409
1967	935
1968	745
1969	728
1970	547
1971	924
1972	546
1973	589
1974	244
1975	666
1976	1,630
1977	906
1978	620
1979	810
1980	675
1981	621
1982	965
1983	1,365
1984	720
1985	917
1986	997
1987	960
1988	1,082
1989	638
1990	1,065
1991	614
1992	1,105
1993	847
1994	1,047
1995	1,211
1996	1,044
1997	889
1998	1,795
1999	1,730
2000	1,082
2001	1,013
2002	2,284
2003	1,037
2004	761
2005	572
2006	1,430
2007	863
2008	842
2009	779
2010	606
2011	982
2012	920
2013	1,796
2014	913
2015	813
2016	977
2017	469
2018	1,585
2019	458
2020	1,165
2021	701
2022	831
2023	628
2024	690
2025	1,058
2026	838

Download the Data

Data for records on 1921-04-17: 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 20	120
20 to 40	6
40 to 60	1
60 to 80	2
80 to 100	2
100 to 120	2
120 to 140	1