Weather Records on 21 May 1991

1,065 weather records were set or tied worldwide on 21 May 1991. Highest significance: Boggabri Post Office, AU.

Key Facts for 21 May 1991

On 21 May 1991, 1,065 weather records were set or tied at long-record stations worldwide.
383 were record highs and 233 were record lows, counting maximum and minimum temperature.
By timescale, 6 were all-time records, 36 monthly and 1,023 daily.
Boggabri Post Office set a daily record precipitation of 54.0 mm (2.1 in) on 21 May 1991.
Across 156 earlier years (1793 to 2026) the same calendar date averaged 457 records.

Record Map

1,065 stations

1,065 station records on 21 May 1991 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 May 1991: highest significance records shown on the map
Station	Country	Type	Value	Significance
Boggabri Post Office	Australia	Record daily precipitation	54.0 mm (2.1 in)	72 of 100 (Major)
Yoongarillup	Australia	Record daily precipitation	155.0 mm (6.1 in)	70 of 100 (Major)
Barraba (Mount Lindsay)	Australia	Record daily precipitation	105.6 mm (4.2 in)	70 of 100 (Major)
Nyngan Airport	Australia	Record daily precipitation	62.0 mm (2.4 in)	68 of 100 (Major)
Ivanhoe Post Office	Australia	Record daily precipitation	47.8 mm (1.9 in)	67 of 100 (Major)
Busselton Shire	Australia	Record daily precipitation	142.0 mm (5.6 in)	65 of 100 (Major)
Nannup	Australia	Record daily precipitation	102.4 mm (4.0 in)	63 of 100 (Major)
Coonabarabran (Namoi Street)	Australia	Record daily precipitation	77.0 mm (3.0 in)	62 of 100 (Major)
Taos	United States	Record daily precipitation	40.4 mm (1.6 in)	62 of 100 (Major)
Mullaley Post Office	Australia	Record daily precipitation	79.2 mm (3.1 in)	61 of 100 (Major)
Walgett Council Depot	Australia	Record daily precipitation	99.8 mm (3.9 in)	60 of 100 (Major)
Binnaway (Wattle St)	Australia	Record daily precipitation	45.4 mm (1.8 in)	60 of 100 (Major)
Przhevalsk	Kyrgyzstan	Record daily precipitation	45.0 mm (1.8 in)	59 of 100 (Notable)
Mullaley (Bando)	Australia	Record daily precipitation	92.8 mm (3.7 in)	57 of 100 (Notable)
Morro Do Pilar	Brazil	Record daily precipitation	56.0 mm (2.2 in)	57 of 100 (Notable)
Bohodukhiv	Ukraine	Record daily precipitation	80.0 mm (3.1 in)	57 of 100 (Notable)
Springfields	Australia	Record daily precipitation	65.0 mm (2.6 in)	56 of 100 (Notable)
Roma Post Office	Australia	Record daily precipitation	64.4 mm (2.5 in)	56 of 100 (Notable)
Itajuipe (Piranji)	Brazil	Record daily precipitation	53.1 mm (2.1 in)	56 of 100 (Notable)
Baradine Post Office	Australia	Record daily precipitation	90.4 mm (3.6 in)	55 of 100 (Notable)
Mountainair	United States	Record daily precipitation	34.3 mm (1.4 in)	55 of 100 (Notable)
Cerro	United States	Record daily precipitation	26.7 mm (1.1 in)	54 of 100 (Notable)
Yannergee (Dobroyd)	Australia	Record daily precipitation	51.0 mm (2.0 in)	53 of 100 (Notable)
Itamaraju	Brazil	Record daily precipitation	57.9 mm (2.3 in)	53 of 100 (Notable)
Coroaci	Brazil	Record daily precipitation	44.8 mm (1.8 in)	53 of 100 (Notable)
Capel	Australia	Record daily precipitation	85.2 mm (3.4 in)	52 of 100 (Notable)
Narromine (Mumble Peg)	Australia	Record daily precipitation	35.0 mm (1.4 in)	52 of 100 (Notable)
Guanhaes	Brazil	Record daily precipitation	47.0 mm (1.9 in)	52 of 100 (Notable)
Pecos Nm	United States	Record daily precipitation	47.0 mm (1.9 in)	52 of 100 (Notable)
Wee Waa (George St)	Australia	Record daily precipitation	53.0 mm (2.1 in)	51 of 100 (Notable)
Boggabri (Milchengowrie)	Australia	Record daily precipitation	50.6 mm (2.0 in)	51 of 100 (Notable)
Tamworth Airport	Australia	Record daily precipitation	37.6 mm (1.5 in)	51 of 100 (Notable)
Ignacio Lopez Rayon	Mexico	Record low minimum temperature	15.0 C (59.0 F)	51 of 100 (Notable)
Des Moines	United States	Record daily snowfall	13.7 cm (5.4 in)	51 of 100 (Notable)
Prado	Brazil	Record daily precipitation	95.9 mm (3.8 in)	50 of 100 (Notable)
Alcobaca	Brazil	Record daily precipitation	104.3 mm (4.1 in)	50 of 100 (Notable)
Estancia 4N	United States	Record daily precipitation	58.4 mm (2.3 in)	50 of 100 (Notable)
Newkirk	United States	Record daily precipitation	47.8 mm (1.9 in)	50 of 100 (Notable)
Miandetta (Tyrone)	Australia	Record daily precipitation	40.6 mm (1.6 in)	49 of 100 (Notable)
Blackville Post Office	Australia	Record daily precipitation	44.0 mm (1.7 in)	49 of 100 (Notable)
Curlewis Post Office	Australia	Record daily precipitation	59.0 mm (2.3 in)	49 of 100 (Notable)
Cassilis (Dalkeith)	Australia	Record daily precipitation	31.6 mm (1.2 in)	49 of 100 (Notable)
Red Rvr	United States	Record daily precipitation	44.7 mm (1.8 in)	49 of 100 (Notable)
Enshi	China	Record daily precipitation	95.6 mm (3.8 in)	48 of 100 (Notable)
Cape Naturaliste	Australia	Record daily precipitation	73.8 mm (2.9 in)	47 of 100 (Notable)
Newbicup	Australia	Record daily precipitation	45.0 mm (1.8 in)	47 of 100 (Notable)
Chapman Hill	Australia	Record daily precipitation	113.6 mm (4.5 in)	47 of 100 (Notable)
Itauninhas	Brazil	Record daily precipitation	38.6 mm (1.5 in)	47 of 100 (Notable)
Taquaracu	Brazil	Record daily precipitation	36.5 mm (1.4 in)	47 of 100 (Notable)
Wee Waa (Pendennis)	Australia	Record daily precipitation	38.4 mm (1.5 in)	46 of 100 (Notable)
Manilla Post Office	Australia	Record daily precipitation	32.4 mm (1.3 in)	46 of 100 (Notable)
Barra de Sao Francisco	Brazil	Record daily precipitation	25.0 mm (1.0 in)	46 of 100 (Notable)
Conceicao Do Mato D	Brazil	Record daily precipitation	43.5 mm (1.7 in)	46 of 100 (Notable)
Caete	Brazil	Record daily precipitation	57.3 mm (2.3 in)	46 of 100 (Notable)
Covington	United States	Record low maximum temperature	16.1 C (61.0 F)	46 of 100 (Notable)
Surat	Australia	Record daily precipitation	54.0 mm (2.1 in)	45 of 100 (Notable)
Blackville (Krui Vale)	Australia	Record daily precipitation	57.0 mm (2.2 in)	45 of 100 (Notable)
Usina Peti	Brazil	Record daily precipitation	42.8 mm (1.7 in)	45 of 100 (Notable)
Manjimup	Australia	Record daily precipitation	61.2 mm (2.4 in)	44 of 100 (Notable)
Rio Casca	Brazil	Record daily precipitation	38.4 mm (1.5 in)	44 of 100 (Notable)

Counts by Type and Timescale

1,065 records

Records set or tied on 21 May 1991 by type: Highest daily maximum 93, Lowest daily maximum 158, Highest daily minimum 290, Lowest daily minimum 75, Heaviest daily rainfall 446, Heaviest daily snowfall 2, Deepest snow cover 1.

Records on 21 May 1991 by type
Record type	Records
Highest daily maximum	93
Lowest daily maximum	158
Highest daily minimum	290
Lowest daily minimum	75
Heaviest daily rainfall	446
Heaviest daily snowfall	2
Deepest snow cover	1

Records on 21 May 1991 by timescale: all-time 6, monthly 36, daily 1,023.

How Much Records Were Beaten By

882 broken records

Margins by which the 882 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 137.0. Ties are not counted.

Top 20 by Significance

21 May 1991

Top 20 records on 21 May 1991 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 May 1991	Boggabri Post Office, AU	daily rain	54.0 mm (2.1 in)	40.0 mm (1.6 in)	94 years	72 of 100 (Major)
21 May 1991	Yoongarillup, AU	all-time rain	155.0 mm (6.1 in)	65.3 mm (2.6 in)	25 years	70 of 100 (Major)
21 May 1991	Barraba (Mount Lindsay), AU	daily rain	105.6 mm (4.2 in)	72.1 mm (2.8 in)	69 years	70 of 100 (Major)
21 May 1991	Nyngan Airport, AU	daily rain	62.0 mm (2.4 in)	29.0 mm (1.1 in)	101 years	68 of 100 (Major)
21 May 1991	Ivanhoe Post Office, AU	daily rain	47.8 mm (1.9 in)	29.3 mm (1.2 in)	72 years	67 of 100 (Major)
21 May 1991	Busselton Shire, AU	all-time rain	142.0 mm (5.6 in)	15.5 mm (0.6 in)	69 years	65 of 100 (Major)
21 May 1991	Nannup, AU	monthly rain	102.4 mm (4.0 in)	31.3 mm (1.2 in)	45 years	63 of 100 (Major)
21 May 1991	Coonabarabran (Namoi Street), AU	daily rain	77.0 mm (3.0 in)	30.8 mm (1.2 in)	94 years	62 of 100 (Major)
21 May 1991	Taos, US	daily rain	40.4 mm (1.6 in)	20.1 mm (0.8 in)	70 years	62 of 100 (Major)
21 May 1991	Mullaley Post Office, AU	daily rain	79.2 mm (3.1 in)	59.4 mm (2.3 in)	40 years	61 of 100 (Major)
21 May 1991	Walgett Council Depot, AU	monthly rain	99.8 mm (3.9 in)	32.5 mm (1.3 in)	43 years	60 of 100 (Major)
21 May 1991	Binnaway (Wattle St), AU	daily rain	45.4 mm (1.8 in)	25.6 mm (1.0 in)	76 years	60 of 100 (Major)
21 May 1991	Przhevalsk, KG	daily rain	45.0 mm (1.8 in)	16.0 mm (0.6 in)	77 years	59 of 100 (Notable)
21 May 1991	Mullaley (Bando), AU	daily rain	92.8 mm (3.7 in)	65.6 mm (2.6 in)	24 years	57 of 100 (Notable)
21 May 1991	Morro Do Pilar, BR	daily rain	56.0 mm (2.2 in)	50.0 mm (2.0 in)	44 years	57 of 100 (Notable)
21 May 1991	Bohodukhiv, UA	monthly rain	80.0 mm (3.1 in)	37.5 mm (1.5 in)	13 years	57 of 100 (Notable)
21 May 1991	Springfields, AU	daily rain	65.0 mm (2.6 in)	27.9 mm (1.1 in)	76 years	56 of 100 (Notable)
21 May 1991	Roma Post Office, AU	daily rain	64.4 mm (2.5 in)	30.1 mm (1.2 in)	72 years	56 of 100 (Notable)
21 May 1991	Itajuipe (Piranji), BR	daily rain	53.1 mm (2.1 in)	39.1 mm (1.5 in)	41 years	56 of 100 (Notable)
21 May 1991	Baradine Post Office, AU	monthly rain	90.4 mm (3.6 in)	12.2 mm (0.5 in)	89 years	55 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 1,065 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 1991-05-21: 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 2026-10-14 (14 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 20	797
20 to 40	63
40 to 60	14
60 to 80	5
80 to 100	2
100 to 120	0
120 to 140	1