Weather Records on 21 May 2018

525 weather records were set or tied worldwide on 21 May 2018. Highest significance: Nullawarre, AU.

Key Facts for 21 May 2018

On 21 May 2018, 525 weather records were set or tied at long-record stations worldwide.
285 were record highs and 90 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 5 monthly and 518 daily.
Nullawarre set a daily record precipitation of 29.6 mm (1.2 in) on 21 May 2018.
Across 156 earlier years (1793 to 2026) the same calendar date averaged 460 records.

Record Map

525 stations

525 station records on 21 May 2018 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 May 2018: highest significance records shown on the map
Station	Country	Type	Value	Significance
Nullawarre	Australia	Record daily precipitation	29.6 mm (1.2 in)	58 of 100 (Notable)
Yibin	China	Record daily precipitation	78.5 mm (3.1 in)	56 of 100 (Notable)
Inverness 3 SE	United States	Record daily precipitation	58.7 mm (2.3 in)	55 of 100 (Notable)
Uakit	Russia	Record daily precipitation	26.9 mm (1.1 in)	54 of 100 (Notable)
Lamoni	United States	Record daily precipitation	66.0 mm (2.6 in)	48 of 100 (Notable)
Hondo	United States	Record daily precipitation	57.9 mm (2.3 in)	46 of 100 (Notable)
Waynesville 2 W	United States	Record daily precipitation	64.3 mm (2.5 in)	44 of 100 (Notable)
Zakatala	Azerbaijan	Record daily precipitation	99.1 mm (3.9 in)	42 of 100 (Notable)
Bertram 3 ENE	United States	Record daily precipitation	114.6 mm (4.5 in)	42 of 100 (Notable)
Honokaa Town 215	United States	Record daily precipitation	47.2 mm (1.9 in)	42 of 100 (Notable)
Orlando Executive AP	United States	Record low maximum temperature	26.1 C (79.0 F)	42 of 100 (Notable)
Sihccajavri	Norway	Record high minimum temperature	7.7 C (45.9 F)	41 of 100 (Notable)
Perry	United States	Record daily precipitation	68.6 mm (2.7 in)	41 of 100 (Notable)
Calhoun City	United States	Record high minimum temperature	20.6 C (69.1 F)	41 of 100 (Notable)
Yeso 2 S	United States	Record daily precipitation	53.3 mm (2.1 in)	41 of 100 (Notable)
Newport 1 NW	United States	Record high minimum temperature	18.9 C (66.0 F)	41 of 100 (Notable)
Madisonville	United States	Record daily precipitation	85.9 mm (3.4 in)	41 of 100 (Notable)
Eggegrund	Sweden	Record high maximum temperature	24.3 C (75.7 F)	39 of 100 (Notable)
Raton Fltr Plt	United States	Record daily precipitation	45.5 mm (1.8 in)	39 of 100 (Notable)
Sarh	Chad	Record low minimum temperature	15.5 C (59.9 F)	38 of 100 (Notable)
Wynne	United States	Record high maximum temperature	34.4 C (93.9 F)	38 of 100 (Notable)
Lafayette	United States	Record daily precipitation	74.4 mm (2.9 in)	38 of 100 (Notable)
Dothan Rgnl AP	United States	Record daily precipitation	79.2 mm (3.1 in)	38 of 100 (Notable)
Raton Krtn Radio	United States	Record daily precipitation	34.0 mm (1.3 in)	37 of 100 (Notable)
Brackettville 22 N	United States	Record daily precipitation	77.5 mm (3.1 in)	37 of 100 (Notable)
Chicago Ohare Intl AP	United States	Record daily precipitation	49.8 mm (2.0 in)	37 of 100 (Notable)
Kautokeino	Norway	Record high minimum temperature	7.2 C (45.0 F)	36 of 100 (Notable)
London State Fish Hatchery	United States	Record daily precipitation	26.7 mm (1.1 in)	36 of 100 (Notable)
Mersa Matruh	Egypt	Record high maximum temperature	42.4 C (108.3 F)	34 of 100 (Routine)
Soderarm	Sweden	Record high maximum temperature	18.4 C (65.1 F)	34 of 100 (Routine)
Ozark Beach 2 NNE	United States	Record daily precipitation	57.9 mm (2.3 in)	34 of 100 (Routine)
Ocala	United States	Record daily precipitation	107.2 mm (4.2 in)	33 of 100 (Routine)
Port San Juan	United States	Record daily precipitation	59.4 mm (2.3 in)	33 of 100 (Routine)
Foster (Post Office)	Australia	Record daily precipitation	28.0 mm (1.1 in)	32 of 100 (Routine)
Kashi	China	Record daily precipitation	29.0 mm (1.1 in)	32 of 100 (Routine)
Kurgan	Russia	Record high minimum temperature	15.7 C (60.3 F)	32 of 100 (Routine)
Kursk	Russia	Record daily precipitation	31.1 mm (1.2 in)	32 of 100 (Routine)
Lainio	Sweden	Record high minimum temperature	12.9 C (55.2 F)	32 of 100 (Routine)
Otis	United States	Record high minimum temperature	16.7 C (62.1 F)	32 of 100 (Routine)
Lodwar	Kenya	Record low maximum temperature	31.7 C (89.1 F)	31 of 100 (Routine)
Vigra	Norway	Record high minimum temperature	14.2 C (57.6 F)	31 of 100 (Routine)
Cakir	Russia	Record low maximum temperature	6.2 C (43.2 F)	31 of 100 (Routine)
Ganca	Azerbaijan	Record daily precipitation	99.8 mm (3.9 in)	30 of 100 (Routine)
Gogland	Russia	Record high minimum temperature	11.5 C (52.7 F)	30 of 100 (Routine)
Minusinsk	Russia	Record low minimum temperature	-5.5 C (22.1 F)	30 of 100 (Routine)
Antalya	Turkey	Record high minimum temperature	21.4 C (70.5 F)	30 of 100 (Routine)
Wewahitchka	United States	Record daily precipitation	35.6 mm (1.4 in)	30 of 100 (Routine)
Encinal	United States	Record low minimum temperature	9.4 C (48.9 F)	30 of 100 (Routine)
Muscle Shoals AP	United States	Record high minimum temperature	20.6 C (69.1 F)	30 of 100 (Routine)
Yajlju	Russia	Record low minimum temperature	-1.9 C (28.6 F)	29 of 100 (Routine)
Potlatch 3 NNE	United States	Record high minimum temperature	12.2 C (54.0 F)	29 of 100 (Routine)
Brenham	United States	Record daily precipitation	56.9 mm (2.2 in)	29 of 100 (Routine)
Mt. Alyeska	United States	Record daily precipitation	33.0 mm (1.3 in)	29 of 100 (Routine)
General Wayne A Downing Intl A	United States	Record daily precipitation	31.5 mm (1.2 in)	29 of 100 (Routine)
Baker City AP	United States	Record high minimum temperature	10.6 C (51.1 F)	29 of 100 (Routine)
Uil	Kazakhstan	Record high maximum temperature	35.6 C (96.1 F)	28 of 100 (Routine)
Janiskoski	Russia	Record high minimum temperature	8.8 C (47.8 F)	28 of 100 (Routine)
Balagansk	Russia	Record low maximum temperature	7.1 C (44.8 F)	28 of 100 (Routine)
Ulety	Russia	Record low maximum temperature	7.0 C (44.6 F)	28 of 100 (Routine)
Pullman 2 NW	United States	Record high minimum temperature	12.8 C (55.0 F)	28 of 100 (Routine)

Counts by Type and Timescale

525 records

Records set or tied on 21 May 2018 by type: Highest daily maximum 115, Lowest daily maximum 53, Highest daily minimum 170, Lowest daily minimum 37, Heaviest daily rainfall 148, Heaviest daily snowfall 1, Deepest snow cover 1.

Records on 21 May 2018 by type
Record type	Records
Highest daily maximum	115
Lowest daily maximum	53
Highest daily minimum	170
Lowest daily minimum	37
Heaviest daily rainfall	148
Heaviest daily snowfall	1
Deepest snow cover	1

Records on 21 May 2018 by timescale: all-time 2, monthly 5, daily 518.

How Much Records Were Beaten By

439 broken records

Margins by which the 439 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 180.0. Ties are not counted.

Top 20 by Significance

21 May 2018

Top 20 records on 21 May 2018 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 May 2018	Nullawarre, AU	daily rain	29.6 mm (1.2 in)	11.1 mm (0.4 in)	100 years	58 of 100 (Notable)
21 May 2018	Yibin, CN	daily rain	78.5 mm (3.1 in)	42.6 mm (1.7 in)	35 years	56 of 100 (Notable)
21 May 2018	Inverness 3 SE, US	daily rain	58.7 mm (2.3 in)	25.7 mm (1.0 in)	107 years	55 of 100 (Notable)
21 May 2018	Uakit, RU	daily rain	26.9 mm (1.1 in)	14.2 mm (0.6 in)	40 years	54 of 100 (Notable)
21 May 2018	Lamoni, US	daily rain	66.0 mm (2.6 in)	20.8 mm (0.8 in)	73 years	48 of 100 (Notable)
21 May 2018	Hondo, US	daily rain	57.9 mm (2.3 in)	14.0 mm (0.6 in)	101 years	46 of 100 (Notable)
21 May 2018	Waynesville 2 W, US	daily rain	64.3 mm (2.5 in)	28.7 mm (1.1 in)	60 years	44 of 100 (Notable)
21 May 2018	Zakatala, AZ	daily rain	99.1 mm (3.9 in)	49.1 mm (1.9 in)	15 years	42 of 100 (Notable)
21 May 2018	Bertram 3 ENE, US	daily rain	114.6 mm (4.5 in)	52.1 mm (2.1 in)	35 years	42 of 100 (Notable)
21 May 2018	Honokaa Town 215, US	daily rain	47.2 mm (1.9 in)	15.4 mm (0.6 in)	80 years	42 of 100 (Notable)
21 May 2018	Orlando Executive AP, US	daily low max	26.1 C (79.0 F)	0.6 C (1.1 F)	116 years	42 of 100 (Notable)
21 May 2018	Sihccajavri, NO	daily high min	7.7 C (45.9 F)	3.8 C (6.8 F)	77 years	41 of 100 (Notable)
21 May 2018	Perry, US	daily rain	68.6 mm (2.7 in)	25.2 mm (1.0 in)	60 years	41 of 100 (Notable)
21 May 2018	Calhoun City, US	daily high min	20.6 C (69.1 F)	0.6 C (1.1 F)	103 years	41 of 100 (Notable)
21 May 2018	Yeso 2 S, US	daily rain	53.3 mm (2.1 in)	29.9 mm (1.2 in)	20 years	41 of 100 (Notable)
21 May 2018	Newport 1 NW, US	daily high min	18.9 C (66.0 F)	0.6 C (1.1 F)	116 years	41 of 100 (Notable)
21 May 2018	Madisonville, US	daily rain	85.9 mm (3.4 in)	41.4 mm (1.6 in)	35 years	41 of 100 (Notable)
21 May 2018	Eggegrund, SE	daily high max	24.3 C (75.7 F)	6.1 C (11.0 F)	64 years	39 of 100 (Notable)
21 May 2018	Raton Fltr Plt, US	daily rain	45.5 mm (1.8 in)	23.4 mm (0.9 in)	39 years	39 of 100 (Notable)
21 May 2018	Sarh, TD	daily low min	15.5 C (59.9 F)	3.5 C (6.3 F)	51 years	38 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 2018

Records set or tied on this calendar date in each year from 1793 to 2018. 2018 had 525 records.

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

Records on 05-21 in each year
Year	Records
1793	1
1795	1
1811	1
1837	2
1842	1
1847	2
1854	1
1857	1
1858	1
1865	1
1866	1
1870	2
1875	1
1876	1
1880	2
1882	1
1885	1
1886	2
1887	3
1889	5
1890	3
1891	6
1892	1
1893	1
1894	4
1895	4
1896	5
1897	2
1898	1
1899	5
1900	1
1901	3
1902	4
1903	26
1904	8
1905	7
1906	12
1907	36
1908	13
1909	13
1910	14
1911	87
1912	24
1913	13
1914	26
1915	24
1916	13
1917	76
1918	51
1919	170
1920	39
1921	158
1922	39
1923	125
1924	148
1925	250
1926	221
1927	207
1928	173
1929	247
1930	133
1931	488
1932	343
1933	290
1934	590
1935	190
1936	328
1937	227
1938	348
1939	355
1940	456
1941	525
1942	482
1943	463
1944	310
1945	515
1946	324
1947	485
1948	312
1949	593
1950	403
1951	271
1952	385
1953	501
1954	961
1955	507
1956	409
1957	709
1958	511
1959	684
1960	615
1961	306
1962	553
1963	598
1964	788
1965	238
1966	296
1967	1,022
1968	549
1969	832
1970	449
1971	536
1972	557
1973	493
1974	847
1975	1,160
1976	393
1977	756
1978	575
1979	787
1980	857
1981	1,550
1982	599
1983	1,106
1984	950
1985	610
1986	908
1987	1,242
1988	819
1989	671
1990	947
1991	1,065
1992	1,143
1993	1,197
1994	656
1995	749
1996	1,461
1997	953
1998	1,200
1999	544
2000	897
2001	1,187
2002	2,048
2003	807
2004	898
2005	1,020
2006	810
2007	894
2008	740
2009	1,315
2010	962
2011	959
2012	848
2013	884
2014	522
2015	956
2016	567
2017	780
2018	525
2019	1,668
2020	707
2021	1,131
2022	1,512
2023	794
2024	751
2025	776
2026	356

Download the Data

Data for records on 2018-05-21: 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 2026-10-13. Last revised 13 October 2026 (2026-10-13).

Margin	Records
0 to 25	424
25 to 50	12
50 to 75	2
75 to 100	0
100 to 125	0
125 to 150	0
150 to 175	0
175 to 200	1