Weather Records on 21 April 1997

964 weather records were set or tied worldwide on 21 April 1997. Highest significance: Opheim 10 N, US.

Key Facts for 21 April 1997

On 21 April 1997, 964 weather records were set or tied at long-record stations worldwide.
299 were record highs and 342 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 43 monthly and 920 daily.
Opheim 10 N set a monthly record daily precipitation of 53.3 mm (2.1 in) on 21 April 1997.
Across 159 earlier years (1793 to 2026) the same calendar date averaged 459 records.

Record Map

964 stations

964 station records on 21 April 1997 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 April 1997: highest significance records shown on the map
Station	Country	Type	Value	Significance
Opheim 10 N	United States	Record daily precipitation	53.3 mm (2.1 in)	62 of 100 (Major)
Ia?U	Brazil	Record daily precipitation	55.6 mm (2.2 in)	60 of 100 (Major)
Novi Sad	Serbia	Record daily precipitation	31.5 mm (1.2 in)	55 of 100 (Notable)
Opheim 12 SSE	United States	Record daily precipitation	34.0 mm (1.3 in)	52 of 100 (Notable)
Washington Wwtp 4W	United States	Record daily precipitation	38.1 mm (1.5 in)	52 of 100 (Notable)
Wibaux 2 E	United States	Record daily precipitation	26.4 mm (1.0 in)	51 of 100 (Notable)
Krakmo	Norway	Record snow depth	152.0 cm (59.8 in)	50 of 100 (Notable)
Randle 1 E	United States	Record daily precipitation	47.2 mm (1.9 in)	50 of 100 (Notable)
Paso Robles	United States	Record high minimum temperature	12.8 C (55.0 F)	49 of 100 (Notable)
Pesaro	Italy	Record daily precipitation	57.5 mm (2.3 in)	48 of 100 (Notable)
Clube de Regatas	Brazil	Record daily precipitation	70.5 mm (2.8 in)	46 of 100 (Notable)
Hvar	Croatia	Record daily precipitation	33.2 mm (1.3 in)	46 of 100 (Notable)
Waren	Germany	Record low minimum temperature	-4.2 C (24.4 F)	45 of 100 (Notable)
Ruby Lake Nwr	United States	Record daily precipitation	26.4 mm (1.0 in)	45 of 100 (Notable)
Kremsmuenster	Austria	Record low minimum temperature	-3.4 C (25.9 F)	44 of 100 (Notable)
Nilo Pecanha	Brazil	Record daily precipitation	72.2 mm (2.8 in)	44 of 100 (Notable)
Sierra Blanca 2 E	United States	Record high minimum temperature	17.8 C (64.0 F)	44 of 100 (Notable)
Ankenes	Norway	Record snow depth	130.0 cm (51.2 in)	43 of 100 (Notable)
Lenorah	United States	Record daily precipitation	50.8 mm (2.0 in)	43 of 100 (Notable)
Crossville Mem AP	United States	Record daily precipitation	65.8 mm (2.6 in)	43 of 100 (Notable)
Vredefort (Skl)	South Africa	Record daily precipitation	36.5 mm (1.4 in)	42 of 100 (Notable)
Adin Rs	United States	Record high minimum temperature	7.2 C (45.0 F)	42 of 100 (Notable)
Rimini 2 SSW	United States	Record daily precipitation	32.3 mm (1.3 in)	42 of 100 (Notable)
Lichtentanne	Germany	Record low minimum temperature	-4.4 C (24.1 F)	41 of 100 (Notable)
Makwassie	South Africa	Record daily precipitation	26.5 mm (1.0 in)	41 of 100 (Notable)
Mud Mtn Dam	United States	Record daily precipitation	39.6 mm (1.6 in)	41 of 100 (Notable)
Bishop AP	United States	Record high minimum temperature	12.8 C (55.0 F)	40 of 100 (Notable)
Quartzsite	United States	Record high minimum temperature	22.2 C (72.0 F)	39 of 100 (Notable)
Lake Spaulding	United States	Record high minimum temperature	7.2 C (45.0 F)	39 of 100 (Notable)
Quincy	United States	Record high minimum temperature	10.0 C (50.0 F)	39 of 100 (Notable)
Arrowrock Dam	United States	Record daily precipitation	27.9 mm (1.1 in)	39 of 100 (Notable)
Isabela Substn	Puerto Rico [United States]	Record high maximum temperature	32.8 C (91.0 F)	38 of 100 (Notable)
Prescott	United States	Record high minimum temperature	11.7 C (53.1 F)	38 of 100 (Notable)
Aurora Water	United States	Record low minimum temperature	-5.0 C (23.0 F)	38 of 100 (Notable)
Weston	United States	Record low minimum temperature	-5.0 C (23.0 F)	38 of 100 (Notable)
Modesto AP	United States	Record high minimum temperature	16.1 C (61.0 F)	38 of 100 (Notable)
Split Marjan	Croatia	Record daily precipitation	57.0 mm (2.2 in)	37 of 100 (Notable)
Geluk	South Africa	Record daily precipitation	32.3 mm (1.3 in)	37 of 100 (Notable)
Haparanda	Sweden	Record snow depth	76.0 cm (29.9 in)	37 of 100 (Notable)
De Sabla	United States	Record high minimum temperature	10.6 C (51.1 F)	37 of 100 (Notable)
Lodi	United States	Record high minimum temperature	15.0 C (59.0 F)	37 of 100 (Notable)
Santa Cruz	United States	Record high minimum temperature	13.9 C (57.0 F)	37 of 100 (Notable)
Montville "Craglands"	Australia	Record daily precipitation	79.0 mm (3.1 in)	35 of 100 (Notable)
Orskog	Norway	Record daily precipitation	28.9 mm (1.1 in)	35 of 100 (Notable)
San Jose	United States	Record high minimum temperature	16.1 C (61.0 F)	35 of 100 (Notable)
Woodland Hills Pierce College	United States	Record high minimum temperature	21.1 C (70.0 F)	35 of 100 (Notable)
Red Rvr	United States	Record high minimum temperature	5.6 C (42.1 F)	35 of 100 (Notable)
Anderson	United States	Record low maximum temperature	11.7 C (53.1 F)	35 of 100 (Notable)
Yemassee 1 N	United States	Record high minimum temperature	21.7 C (71.1 F)	35 of 100 (Notable)
Gabes	Tunisia	Record high minimum temperature	19.5 C (67.1 F)	34 of 100 (Routine)
Tres Zapotes	Mexico	Record low minimum temperature	11.1 C (52.0 F)	33 of 100 (Routine)
Storsteinnes I Balsfjord	Norway	Record snow depth	183.0 cm (72.0 in)	33 of 100 (Routine)
Altamura	South Africa	Record daily precipitation	31.0 mm (1.2 in)	33 of 100 (Routine)
Werk-Met-Lus	South Africa	Record daily precipitation	31.0 mm (1.2 in)	33 of 100 (Routine)
Wupatki Nm	United States	Record high minimum temperature	17.8 C (64.0 F)	33 of 100 (Routine)
Portola	United States	Record high minimum temperature	8.3 C (46.9 F)	33 of 100 (Routine)
Hachita 1W	United States	Record high minimum temperature	16.1 C (61.0 F)	33 of 100 (Routine)
Zavizan	Croatia	Record daily precipitation	64.3 mm (2.5 in)	32 of 100 (Routine)
Roma Ciampino	Italy	Record daily precipitation	27.8 mm (1.1 in)	32 of 100 (Routine)
Nelsdrift	South Africa	Record daily precipitation	28.0 mm (1.1 in)	32 of 100 (Routine)

Counts by Type and Timescale

964 records

Records set or tied on 21 April 1997 by type: Highest daily maximum 105, Lowest daily maximum 100, Highest daily minimum 194, Lowest daily minimum 242, Heaviest daily rainfall 286, Heaviest daily snowfall 1, Deepest snow cover 36.

Records on 21 April 1997 by type
Record type	Records
Highest daily maximum	105
Lowest daily maximum	100
Highest daily minimum	194
Lowest daily minimum	242
Heaviest daily rainfall	286
Heaviest daily snowfall	1
Deepest snow cover	36

Records on 21 April 1997 by timescale: all-time 1, monthly 43, daily 920.

How Much Records Were Beaten By

794 broken records

Margins by which the 794 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 750.0. Ties are not counted.

Top 20 by Significance

21 April 1997

Top 20 records on 21 April 1997 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 April 1997	Opheim 10 N, US	monthly rain	53.3 mm (2.1 in)	33.0 mm (1.3 in)	27 years	62 of 100 (Major)
21 April 1997	Ia?U, BR	daily rain	55.6 mm (2.2 in)	43.6 mm (1.7 in)	52 years	60 of 100 (Major)
21 April 1997	Novi Sad, RS	daily rain	31.5 mm (1.2 in)	17.9 mm (0.7 in)	48 years	55 of 100 (Notable)
21 April 1997	Opheim 12 SSE, US	daily rain	34.0 mm (1.3 in)	29.4 mm (1.2 in)	26 years	52 of 100 (Notable)
21 April 1997	Washington Wwtp 4W, US	daily rain	38.1 mm (1.5 in)	16.5 mm (0.6 in)	96 years	52 of 100 (Notable)
21 April 1997	Wibaux 2 E, US	daily rain	26.4 mm (1.0 in)	20.0 mm (0.8 in)	39 years	51 of 100 (Notable)
21 April 1997	Krakmo, NO	daily snow depth	152.0 cm (59.8 in)	30.0 cm (11.8 in)	92 years	50 of 100 (Notable)
21 April 1997	Randle 1 E, US	daily rain	47.2 mm (1.9 in)	26.4 mm (1.0 in)	39 years	50 of 100 (Notable)
21 April 1997	Paso Robles, US	daily high min	12.8 C (55.0 F)	2.8 C (5.0 F)	102 years	49 of 100 (Notable)
21 April 1997	Pesaro, IT	monthly rain	57.5 mm (2.3 in)	9.7 mm (0.38 in)	47 years	48 of 100 (Notable)
21 April 1997	Clube de Regatas, BR	daily rain	70.5 mm (2.8 in)	54.5 mm (2.1 in)	4 years	46 of 100 (Notable)
21 April 1997	Hvar, HR	daily rain	33.2 mm (1.3 in)	15.0 mm (0.6 in)	60 years	46 of 100 (Notable)
21 April 1997	Waren, DE	daily low min	-4.2 C (24.4 F)	1.8 C (3.2 F)	104 years	45 of 100 (Notable)
21 April 1997	Ruby Lake Nwr, US	daily rain	26.4 mm (1.0 in)	17.0 mm (0.7 in)	8 years	45 of 100 (Notable)
21 April 1997	Kremsmuenster, AT	daily low min	-3.4 C (25.9 F)	2.1 C (3.8 F)	94 years	44 of 100 (Notable)
21 April 1997	Nilo Pecanha, BR	daily rain	72.2 mm (2.8 in)	33.5 mm (1.3 in)	47 years	44 of 100 (Notable)
21 April 1997	Sierra Blanca 2 E, US	daily high min	17.8 C (64.0 F)	2.2 C (4.0 F)	100 years	44 of 100 (Notable)
21 April 1997	Ankenes, NO	daily snow depth	130.0 cm (51.2 in)	23.0 cm (9.1 in)	86 years	43 of 100 (Notable)
21 April 1997	Lenorah, US	daily rain	50.8 mm (2.0 in)	45.2 mm (1.8 in)	10 years	43 of 100 (Notable)
21 April 1997	Crossville Mem AP, US	daily rain	65.8 mm (2.6 in)	37.9 mm (1.5 in)	39 years	43 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 1997

Records set or tied on this calendar date in each year from 1793 to 1997. 1997 had 964 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	886
2024	754
2025	506
2026	853

Download the Data

Data for records on 1997-04-21: 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Margin	Records
0 to 100	779
100 to 200	3
200 to 300	4
300 to 400	4
400 to 500	2
500 to 600	0
600 to 700	1
700 to 800	1