Weather Records on 21 April 1991

1,291 weather records were set or tied worldwide on 21 April 1991. Highest significance: Plymouth-Kingston, US.

Key Facts for 21 April 1991

On 21 April 1991, 1,291 weather records were set or tied at long-record stations worldwide.
252 were record highs and 714 were record lows, counting maximum and minimum temperature.
By timescale, 4 were all-time records, 26 monthly and 1,261 daily.
Plymouth-Kingston set a daily record precipitation of 98.3 mm (3.9 in) on 21 April 1991.
Across 159 earlier years (1793 to 2026) the same calendar date averaged 457 records.

Record Map

1,291 stations

1,291 station records on 21 April 1991 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 April 1991: highest significance records shown on the map
Station	Country	Type	Value	Significance
Plymouth-Kingston	United States	Record daily precipitation	98.3 mm (3.9 in)	78 of 100 (Major)
Brockton	United States	Record daily precipitation	74.4 mm (2.9 in)	70 of 100 (Major)
Haverhill	United States	Record daily precipitation	94.0 mm (3.7 in)	67 of 100 (Major)
Hanover	United States	Record daily precipitation	44.5 mm (1.8 in)	61 of 100 (Major)
Newark Liberty Intl AP	United States	Record daily precipitation	63.5 mm (2.5 in)	61 of 100 (Major)
Riverhead Rsch Farm	United States	Record daily precipitation	58.9 mm (2.3 in)	60 of 100 (Major)
Wallaceton-Lake Drummond	United States	Record daily precipitation	83.8 mm (3.3 in)	60 of 100 (Major)
Plattsburgh AFB	United States	Record daily precipitation	31.0 mm (1.2 in)	59 of 100 (Notable)
Lewes	United States	Record daily precipitation	57.9 mm (2.3 in)	57 of 100 (Notable)
Princess Anne	United States	Record daily precipitation	49.8 mm (2.0 in)	56 of 100 (Notable)
New Bedford Coop	United States	Record daily precipitation	58.7 mm (2.3 in)	56 of 100 (Notable)
Middleton	United States	Record daily precipitation	73.4 mm (2.9 in)	54 of 100 (Notable)
Wilmington New Castle Co AP	United States	Record daily precipitation	39.4 mm (1.6 in)	53 of 100 (Notable)
Ashburnham	United States	Record daily precipitation	72.4 mm (2.9 in)	52 of 100 (Notable)
Denham	Australia	Record daily precipitation	30.8 mm (1.2 in)	51 of 100 (Notable)
Salisbury	United States	Record daily precipitation	40.6 mm (1.6 in)	51 of 100 (Notable)
Snow Hill 4 N	United States	Record daily precipitation	46.7 mm (1.8 in)	51 of 100 (Notable)
Auburn	United States	Record daily precipitation	39.6 mm (1.6 in)	51 of 100 (Notable)
Atlantic City Marina	United States	Record daily precipitation	53.6 mm (2.1 in)	51 of 100 (Notable)
Poughkeepsie AP	United States	Record daily precipitation	55.1 mm (2.2 in)	51 of 100 (Notable)
Indian Mills 2 W	United States	Record daily precipitation	43.7 mm (1.7 in)	50 of 100 (Notable)
Magdeburg	Germany	Record low minimum temperature	-4.6 C (23.7 F)	49 of 100 (Notable)
Durham	United States	Record daily precipitation	50.8 mm (2.0 in)	49 of 100 (Notable)
Bridgehampton	United States	Record daily precipitation	43.4 mm (1.7 in)	49 of 100 (Notable)
Laguardia AP	United States	Record daily precipitation	46.7 mm (1.8 in)	49 of 100 (Notable)
San Luis San Pedro	Mexico	Record high maximum temperature	40.6 C (105.1 F)	48 of 100 (Notable)
Pemberton	United States	Record daily precipitation	41.4 mm (1.6 in)	48 of 100 (Notable)
Wilmington Porter Rsch	United States	Record daily precipitation	43.4 mm (1.7 in)	47 of 100 (Notable)
Cape May 2 NW	United States	Record daily precipitation	47.8 mm (1.9 in)	47 of 100 (Notable)
Augusta State AP	United States	Record daily precipitation	48.0 mm (1.9 in)	47 of 100 (Notable)
Rochester Gtr Intl	United States	Record daily precipitation	45.5 mm (1.8 in)	47 of 100 (Notable)
Binnu	Australia	Record daily precipitation	25.2 mm (1.0 in)	46 of 100 (Notable)
Marcus Hook	United States	Record daily precipitation	32.3 mm (1.3 in)	46 of 100 (Notable)
Block Island State AP	United States	Record daily precipitation	64.8 mm (2.6 in)	46 of 100 (Notable)
Howatharra	Australia	Record daily precipitation	25.0 mm (1.0 in)	45 of 100 (Notable)
Vastervik	Sweden	Record low minimum temperature	-9.4 C (15.1 F)	45 of 100 (Notable)
Ny Westerleigh Stat Is	United States	Record daily precipitation	65.3 mm (2.6 in)	45 of 100 (Notable)
Buffalo	United States	Record daily precipitation	31.5 mm (1.2 in)	45 of 100 (Notable)
Portland Jetport	United States	Record daily precipitation	106.9 mm (4.2 in)	45 of 100 (Notable)
Woodstown Pittsgrov 4E	United States	Record daily precipitation	37.1 mm (1.5 in)	44 of 100 (Notable)
Mineola	United States	Record daily precipitation	46.7 mm (1.8 in)	44 of 100 (Notable)
Tarboro 1 S	United States	Record daily precipitation	42.9 mm (1.7 in)	44 of 100 (Notable)
Albany Intl AP	United States	Record daily precipitation	40.1 mm (1.6 in)	44 of 100 (Notable)
Providence	United States	Record daily precipitation	77.7 mm (3.1 in)	44 of 100 (Notable)
South Weymouth NAS	United States	Record daily precipitation	62.7 mm (2.5 in)	44 of 100 (Notable)
Jfk Intl AP	United States	Record daily precipitation	53.8 mm (2.1 in)	44 of 100 (Notable)
Balla	Australia	Record daily precipitation	34.8 mm (1.4 in)	43 of 100 (Notable)
Rumford 1 SSE	United States	Record daily precipitation	42.9 mm (1.7 in)	43 of 100 (Notable)
West Buxton 2 NNW	United States	Record daily precipitation	90.2 mm (3.6 in)	43 of 100 (Notable)
Milford	United States	Record daily precipitation	68.3 mm (2.7 in)	43 of 100 (Notable)
Woodcliff Lake	United States	Record daily precipitation	52.1 mm (2.1 in)	43 of 100 (Notable)
Uttaradit	Thailand	Record daily precipitation	94.0 mm (3.7 in)	42 of 100 (Notable)
Glens Falls Farm	United States	Record daily precipitation	39.4 mm (1.6 in)	42 of 100 (Notable)
Hartford-Bradley Intl AP	United States	Record daily precipitation	52.8 mm (2.1 in)	42 of 100 (Notable)
Willow Grove NAS	United States	Record daily precipitation	39.1 mm (1.5 in)	42 of 100 (Notable)
Ojuelos de Jalisco (Dge)	Mexico	Record high maximum temperature	43.9 C (111.0 F)	41 of 100 (Notable)
Vienna	United States	Record daily precipitation	38.4 mm (1.5 in)	41 of 100 (Notable)
Cherry Valley 2 NNE	United States	Record daily precipitation	38.4 mm (1.5 in)	41 of 100 (Notable)
Patchogue 2 N	United States	Record daily precipitation	37.1 mm (1.5 in)	41 of 100 (Notable)
Ny City Cntrl Park	United States	Record daily precipitation	57.9 mm (2.3 in)	41 of 100 (Notable)

Counts by Type and Timescale

1,291 records

Records set or tied on 21 April 1991 by type: Highest daily maximum 114, Lowest daily maximum 286, Highest daily minimum 138, Lowest daily minimum 428, Heaviest daily rainfall 294, Heaviest daily snowfall 4, Deepest snow cover 27.

Records on 21 April 1991 by type
Record type	Records
Highest daily maximum	114
Lowest daily maximum	286
Highest daily minimum	138
Lowest daily minimum	428
Heaviest daily rainfall	294
Heaviest daily snowfall	4
Deepest snow cover	27

Records on 21 April 1991 by timescale: all-time 4, monthly 26, daily 1,261.

How Much Records Were Beaten By

1,107 broken records

Margins by which the 1,107 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 508.0. Ties are not counted.

Top 20 by Significance

21 April 1991

Top 20 records on 21 April 1991 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 April 1991	Plymouth-Kingston, US	daily rain	98.3 mm (3.9 in)	71.4 mm (2.8 in)	97 years	78 of 100 (Major)
21 April 1991	Brockton, US	daily rain	74.4 mm (2.9 in)	47.5 mm (1.9 in)	72 years	70 of 100 (Major)
21 April 1991	Haverhill, US	daily rain	94.0 mm (3.7 in)	67.6 mm (2.7 in)	61 years	67 of 100 (Major)
21 April 1991	Hanover, US	daily rain	44.5 mm (1.8 in)	26.2 mm (1.0 in)	61 years	61 of 100 (Major)
21 April 1991	Newark Liberty Intl AP, US	daily rain	63.5 mm (2.5 in)	30.0 mm (1.2 in)	89 years	61 of 100 (Major)
21 April 1991	Riverhead Rsch Farm, US	daily rain	58.9 mm (2.3 in)	47.2 mm (1.9 in)	50 years	60 of 100 (Major)
21 April 1991	Wallaceton-Lake Drummond, US	daily rain	83.8 mm (3.3 in)	46.5 mm (1.8 in)	56 years	60 of 100 (Major)
21 April 1991	Plattsburgh AFB, US	daily rain	31.0 mm (1.2 in)	16.3 mm (0.6 in)	85 years	59 of 100 (Notable)
21 April 1991	Lewes, US	daily rain	57.9 mm (2.3 in)	50.5 mm (2.0 in)	44 years	57 of 100 (Notable)
21 April 1991	Princess Anne, US	daily rain	49.8 mm (2.0 in)	29.0 mm (1.1 in)	74 years	56 of 100 (Notable)
21 April 1991	New Bedford Coop, US	daily rain	58.7 mm (2.3 in)	22.6 mm (0.9 in)	97 years	56 of 100 (Notable)
21 April 1991	Middleton, US	daily rain	73.4 mm (2.9 in)	41.4 mm (1.6 in)	44 years	54 of 100 (Notable)
21 April 1991	Wilmington New Castle Co AP, US	daily rain	39.4 mm (1.6 in)	34.1 mm (1.3 in)	36 years	53 of 100 (Notable)
21 April 1991	Ashburnham, US	daily rain	72.4 mm (2.9 in)	34.8 mm (1.4 in)	40 years	52 of 100 (Notable)
21 April 1991	Denham, AU	daily rain	30.8 mm (1.2 in)	25.7 mm (1.0 in)	60 years	51 of 100 (Notable)
21 April 1991	Salisbury, US	daily rain	40.6 mm (1.6 in)	27.9 mm (1.1 in)	61 years	51 of 100 (Notable)
21 April 1991	Snow Hill 4 N, US	daily rain	46.7 mm (1.8 in)	31.5 mm (1.2 in)	53 years	51 of 100 (Notable)
21 April 1991	Auburn, US	daily rain	39.6 mm (1.6 in)	21.1 mm (0.8 in)	30 years	51 of 100 (Notable)
21 April 1991	Atlantic City Marina, US	daily rain	53.6 mm (2.1 in)	23.4 mm (0.9 in)	62 years	51 of 100 (Notable)
21 April 1991	Poughkeepsie AP, US	daily rain	55.1 mm (2.2 in)	47.5 mm (1.9 in)	24 years	51 of 100 (Notable)

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 1991

Records set or tied on this calendar date in each year from 1793 to 1991. 1991 had 1,291 records.

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

Records on 04-21 in each year
Year	Records
1793	1
1814	1
1820	1
1838	1
1849	2
1851	1
1852	3
1854	1
1858	3
1861	2
1865	3
1866	1
1868	1
1870	1
1875	4
1876	2
1877	1
1879	3
1880	1
1881	1
1882	1
1884	1
1885	2
1888	1
1890	1
1891	1
1892	1
1893	2
1894	4
1895	1
1897	1
1898	2
1899	2
1900	7
1901	17
1902	7
1903	3
1904	10
1905	18
1906	5
1907	17
1908	25
1909	20
1910	33
1911	9
1912	22
1913	14
1914	220
1915	24
1916	64
1917	48
1918	84
1919	31
1920	85
1921	59
1922	70
1923	223
1924	119
1925	295
1926	148
1927	284
1928	269
1929	193
1930	127
1931	358
1932	304
1933	201
1934	497
1935	266
1936	277
1937	416
1938	295
1939	110
1940	462
1941	306
1942	285
1943	481
1944	261
1945	367
1946	448
1947	459
1948	365
1949	448
1950	529
1951	884
1952	665
1953	640
1954	527
1955	607
1956	497
1957	824
1958	329
1959	505
1960	889
1961	647
1962	319
1963	778
1964	1,125
1965	658
1966	756
1967	903
1968	655
1969	388
1970	728
1971	546
1972	593
1973	1,163
1974	528
1975	360
1976	452
1977	854
1978	735
1979	449
1980	1,934
1981	944
1982	1,075
1983	1,366
1984	1,231
1985	1,245
1986	977
1987	1,290
1988	898
1989	1,557
1990	1,463
1991	1,291
1992	1,763
1993	847
1994	859
1995	1,476
1996	788
1997	964
1998	876
1999	752
2000	921
2001	967
2002	1,312
2003	607
2004	586
2005	693
2006	761
2007	480
2008	1,327
2009	983
2010	805
2011	1,053
2012	687
2013	1,015
2014	393
2015	621
2016	587
2017	797
2018	862
2019	731
2020	397
2021	1,608
2022	433
2023	887
2024	754
2025	506
2026	853

Download the Data

Data for records on 1991-04-21: 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 2026-10-15 (15 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 100	1,104
100 to 200	1
200 to 300	0
300 to 400	1
400 to 500	0
500 to 600	1