Weather Records on 18 April 2021

592 weather records were set or tied worldwide on 18 April 2021. Highest significance: Walcha (Karori), AU.

Key Facts for 18 April 2021

On 18 April 2021, 592 weather records were set or tied at long-record stations worldwide.
222 were record highs and 188 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 7 monthly and 585 daily.
Walcha (Karori) set a daily record precipitation of 35.0 mm (1.4 in) on 18 April 2021.
Across 160 earlier years (1793 to 2026) the same calendar date averaged 467 records.

Record Map

592 stations

592 station records on 18 April 2021 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 April 2021: highest significance records shown on the map
Station	Country	Type	Value	Significance
Walcha (Karori)	Australia	Record daily precipitation	35.0 mm (1.4 in)	58 of 100 (Notable)
Tomakomai	Japan	Record daily precipitation	64.0 mm (2.5 in)	57 of 100 (Notable)
Cairns Post Office	Australia	Record daily precipitation	159.3 mm (6.3 in)	51 of 100 (Notable)
Kitamiesashi	Japan	Record daily precipitation	32.0 mm (1.3 in)	50 of 100 (Notable)
Iwamizawa	Japan	Record daily precipitation	41.9 mm (1.6 in)	50 of 100 (Notable)
Elk	United States	Record daily snowfall	5.1 cm (2.0 in)	50 of 100 (Notable)
Ketchikan AP	United States	Record high maximum temperature	22.2 C (72.0 F)	49 of 100 (Notable)
Talkeetna AP	United States	Record high maximum temperature	18.3 C (64.9 F)	49 of 100 (Notable)
Obihiro	Japan	Record daily precipitation	42.9 mm (1.7 in)	48 of 100 (Notable)
Del Norte 3ENE	United States	Record low maximum temperature	-1.7 C (28.9 F)	47 of 100 (Notable)
Cordova AP	United States	Record high maximum temperature	21.7 C (71.1 F)	47 of 100 (Notable)
Longview	United States	Record low maximum temperature	10.6 C (51.1 F)	46 of 100 (Notable)
Junction 4SSW	United States	Record low maximum temperature	13.9 C (57.0 F)	44 of 100 (Notable)
Haines AP	United States	Record high maximum temperature	18.9 C (66.0 F)	44 of 100 (Notable)
Petersburg 1	United States	Record high maximum temperature	20.0 C (68.0 F)	44 of 100 (Notable)
Otaru	Japan	Record daily precipitation	32.0 mm (1.3 in)	43 of 100 (Notable)
Urakawa	Japan	Record daily precipitation	46.0 mm (1.8 in)	43 of 100 (Notable)
Walcha (Emu Creek)	Australia	Record daily precipitation	30.4 mm (1.2 in)	42 of 100 (Notable)
Ebor (Wongwibinda)	Australia	Record daily precipitation	34.0 mm (1.3 in)	42 of 100 (Notable)
Niigata	Japan	Record daily precipitation	32.0 mm (1.3 in)	42 of 100 (Notable)
Dundee (Wattle Dale)	Australia	Record daily precipitation	30.0 mm (1.2 in)	41 of 100 (Notable)
Saguache	United States	Record low maximum temperature	1.7 C (35.1 F)	41 of 100 (Notable)
Ft Lauderdale	United States	Record high maximum temperature	33.3 C (91.9 F)	41 of 100 (Notable)
Cuero	United States	Record low maximum temperature	19.4 C (66.9 F)	41 of 100 (Notable)
Jefferson	United States	Record low maximum temperature	13.9 C (57.0 F)	41 of 100 (Notable)
Elsmore (Danthonia)	Australia	Record daily precipitation	27.5 mm (1.1 in)	40 of 100 (Notable)
Wisley	United Kingdom	Record low minimum temperature	-1.9 C (28.6 F)	40 of 100 (Notable)
Vinga	Sweden	Record high maximum temperature	17.0 C (62.6 F)	38 of 100 (Notable)
Bay City Wtr Wks	United States	Record low maximum temperature	16.7 C (62.1 F)	38 of 100 (Notable)
Rusk	United States	Record low maximum temperature	11.7 C (53.1 F)	38 of 100 (Notable)
Aberdeen	United States	Record high maximum temperature	28.3 C (82.9 F)	38 of 100 (Notable)
Raymondville	United States	Record low maximum temperature	20.0 C (68.0 F)	37 of 100 (Notable)
Skagway	United States	Record high maximum temperature	20.0 C (68.0 F)	37 of 100 (Notable)
Rio Grande City	United States	Record low maximum temperature	17.2 C (63.0 F)	36 of 100 (Notable)
Uralla (Mihi)	Australia	Record daily precipitation	36.2 mm (1.4 in)	35 of 100 (Notable)
Uralla (Blue Nobby)	Australia	Record daily precipitation	25.0 mm (1.0 in)	35 of 100 (Notable)
Oksoey Fyr	Norway	Record high minimum temperature	8.7 C (47.7 F)	35 of 100 (Notable)
Ashdown 4 SSE	United States	Record low maximum temperature	15.0 C (59.0 F)	35 of 100 (Notable)
Abiquiu Dam	United States	Record low minimum temperature	-13.3 C (8.1 F)	35 of 100 (Notable)
Dundee (Karinga)	Australia	Record daily precipitation	28.0 mm (1.1 in)	34 of 100 (Routine)
Wagga Wagga AMO	Australia	Record low minimum temperature	0.8 C (33.4 F)	34 of 100 (Routine)
Torrance AP	United States	Record high maximum temperature	30.6 C (87.1 F)	34 of 100 (Routine)
Lemland Nyhamn	Finland	Record high maximum temperature	11.7 C (53.1 F)	33 of 100 (Routine)
Takada	Japan	Record daily precipitation	29.0 mm (1.1 in)	33 of 100 (Routine)
Yellowtail Dam	United States	Record daily snowfall	12.7 cm (5.0 in)	33 of 100 (Routine)
Beeville 5 NE	United States	Record low maximum temperature	18.9 C (66.0 F)	33 of 100 (Routine)
Juneau Dwtn	United States	Record high maximum temperature	18.9 C (66.0 F)	33 of 100 (Routine)
Pte de la Hague	France	Record low minimum temperature	2.5 C (36.5 F)	32 of 100 (Routine)
Ostrovnoe	Russia	Record high minimum temperature	-2.0 C (28.4 F)	32 of 100 (Routine)
Bogorodskoe	Russia	Record high minimum temperature	2.0 C (35.6 F)	32 of 100 (Routine)
Santa Rosa	United States	Record high maximum temperature	32.2 C (90.0 F)	32 of 100 (Routine)
Ozernaja	Russia	Record high minimum temperature	2.5 C (36.5 F)	31 of 100 (Routine)
San Rafael-Civic Ctr	United States	Record high maximum temperature	31.7 C (89.1 F)	31 of 100 (Routine)
Yellowtail Dam	United States	Record snow depth	12.7 cm (5.0 in)	31 of 100 (Routine)
Stampede Pass	United States	Record high minimum temperature	7.8 C (46.0 F)	31 of 100 (Routine)
Sitka AP	United States	Record high maximum temperature	19.4 C (66.9 F)	31 of 100 (Routine)
Attunga (the Pines)	Australia	Record daily precipitation	27.0 mm (1.1 in)	30 of 100 (Routine)
Nikolskoye/Beringa Ostrov	Russia	Record high minimum temperature	2.3 C (36.1 F)	30 of 100 (Routine)
Finike	Turkey	Record high maximum temperature	31.7 C (89.1 F)	30 of 100 (Routine)
Sacramento AP ASOS	United States	Record high maximum temperature	32.8 C (91.0 F)	30 of 100 (Routine)

Counts by Type and Timescale

592 records

Records set or tied on 18 April 2021 by type: Highest daily maximum 149, Lowest daily maximum 120, Highest daily minimum 73, Lowest daily minimum 68, Heaviest daily rainfall 151, Heaviest daily snowfall 17, Deepest snow cover 14.

Records on 18 April 2021 by type
Record type	Records
Highest daily maximum	149
Lowest daily maximum	120
Highest daily minimum	73
Lowest daily minimum	68
Heaviest daily rainfall	151
Heaviest daily snowfall	17
Deepest snow cover	14

Records on 18 April 2021 by timescale: all-time 0, monthly 7, daily 585.

How Much Records Were Beaten By

505 broken records

Margins by which the 505 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 101.0. Ties are not counted.

Top 20 by Significance

18 April 2021

Top 20 records on 18 April 2021 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 April 2021	Walcha (Karori), AU	daily rain	35.0 mm (1.4 in)	22.8 mm (0.9 in)	70 years	58 of 100 (Notable)
18 April 2021	Tomakomai, JP	daily rain	64.0 mm (2.5 in)	30.1 mm (1.2 in)	67 years	57 of 100 (Notable)
18 April 2021	Cairns Post Office, AU	daily rain	159.3 mm (6.3 in)	34.8 mm (1.4 in)	124 years	51 of 100 (Notable)
18 April 2021	Kitamiesashi, JP	daily rain	32.0 mm (1.3 in)	14.2 mm (0.6 in)	67 years	50 of 100 (Notable)
18 April 2021	Iwamizawa, JP	daily rain	41.9 mm (1.6 in)	16.0 mm (0.6 in)	67 years	50 of 100 (Notable)
18 April 2021	Elk, US	daily snowfall	5.1 cm (2.0 in)	5.1 cm (2.0 in)	124 years	50 of 100 (Notable)
18 April 2021	Ketchikan AP, US	daily high max	22.2 C (72.0 F)	4.4 C (7.9 F)	87 years	49 of 100 (Notable)
18 April 2021	Talkeetna AP, US	daily high max	18.3 C (64.9 F)	3.9 C (7.0 F)	100 years	49 of 100 (Notable)
18 April 2021	Obihiro, JP	daily rain	42.9 mm (1.7 in)	20.0 mm (0.8 in)	67 years	48 of 100 (Notable)
18 April 2021	Del Norte 3ENE, US	daily low max	-1.7 C (28.9 F)	3.9 C (7.0 F)	100 years	47 of 100 (Notable)
18 April 2021	Cordova AP, US	daily high max	21.7 C (71.1 F)	7.3 C (13.1 F)	56 years	47 of 100 (Notable)
18 April 2021	Longview, US	daily low max	10.6 C (51.1 F)	2.7 C (4.9 F)	116 years	46 of 100 (Notable)
18 April 2021	Junction 4SSW, US	daily low max	13.9 C (57.0 F)	2.8 C (5.0 F)	99 years	44 of 100 (Notable)
18 April 2021	Haines AP, US	daily high max	18.9 C (66.0 F)	3.9 C (7.0 F)	84 years	44 of 100 (Notable)
18 April 2021	Petersburg 1, US	daily high max	20.0 C (68.0 F)	5.0 C (9.0 F)	68 years	44 of 100 (Notable)
18 April 2021	Otaru, JP	daily rain	32.0 mm (1.3 in)	9.9 mm (0.39 in)	68 years	43 of 100 (Notable)
18 April 2021	Urakawa, JP	daily rain	46.0 mm (1.8 in)	18.2 mm (0.7 in)	67 years	43 of 100 (Notable)
18 April 2021	Walcha (Emu Creek), AU	daily rain	30.4 mm (1.2 in)	18.8 mm (0.7 in)	31 years	42 of 100 (Notable)
18 April 2021	Ebor (Wongwibinda), AU	daily rain	34.0 mm (1.3 in)	2.8 mm (0.11 in)	112 years	42 of 100 (Notable)
18 April 2021	Niigata, JP	daily rain	32.0 mm (1.3 in)	12.6 mm (0.5 in)	67 years	42 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 2021

Records set or tied on this calendar date in each year from 1793 to 2021. 2021 had 592 records.

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

Records on 04-18 in each year
Year	Records
1793	1
1807	2
1815	1
1838	1
1847	1
1849	1
1851	1
1852	3
1854	3
1855	1
1865	4
1867	1
1870	1
1871	1
1875	4
1877	2
1878	1
1879	3
1880	2
1884	2
1886	2
1887	3
1888	1
1889	1
1890	2
1891	1
1892	3
1893	5
1894	7
1895	2
1896	3
1897	5
1898	8
1899	2
1900	2
1901	6
1902	5
1903	11
1904	9
1905	12
1906	18
1907	17
1908	37
1909	19
1910	19
1911	25
1912	21
1913	26
1914	38
1915	31
1916	22
1917	40
1918	76
1919	16
1920	64
1921	58
1922	85
1923	107
1924	101
1925	154
1926	322
1927	391
1928	323
1929	126
1930	113
1931	173
1932	326
1933	211
1934	391
1935	264
1936	483
1937	477
1938	711
1939	525
1940	322
1941	496
1942	287
1943	298
1944	259
1945	371
1946	357
1947	444
1948	932
1949	345
1950	244
1951	658
1952	536
1953	1,322
1954	442
1955	817
1956	467
1957	629
1958	370
1959	468
1960	320
1961	520
1962	484
1963	662
1964	449
1965	363
1966	776
1967	882
1968	867
1969	795
1970	771
1971	1,106
1972	470
1973	953
1974	326
1975	751
1976	1,309
1977	717
1978	803
1979	841
1980	842
1981	708
1982	616
1983	2,082
1984	625
1985	1,119
1986	622
1987	1,068
1988	936
1989	625
1990	1,368
1991	780
1992	702
1993	730
1994	1,218
1995	1,601
1996	826
1997	1,256
1998	1,011
1999	1,428
2000	912
2001	1,487
2002	2,084
2003	969
2004	846
2005	622
2006	1,262
2007	675
2008	913
2009	624
2010	478
2011	1,122
2012	744
2013	2,509
2014	534
2015	519
2016	973
2017	588
2018	1,202
2019	601
2020	770
2021	592
2022	1,013
2023	739
2024	641
2025	997
2026	498

Download the Data

Data for records on 2021-04-18: 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 2026-10-16. Last revised 16 October 2026 (2026-10-16).

Margin	Records
0 to 20	474
20 to 40	19
40 to 60	8
60 to 80	2
80 to 100	1
100 to 120	1