Weather Records on 21 May 2017

780 weather records were set or tied worldwide on 21 May 2017. Highest significance: Avoca (Railway House), AU.

Key Facts for 21 May 2017

On 21 May 2017, 780 weather records were set or tied at long-record stations worldwide.
221 were record highs and 289 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 18 monthly and 762 daily.
Avoca (Railway House) set a daily record precipitation of 43.2 mm (1.7 in) on 21 May 2017.
Across 156 earlier years (1793 to 2026) the same calendar date averaged 458 records.

Record Map

780 stations

780 station records on 21 May 2017 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 May 2017: highest significance records shown on the map
Station	Country	Type	Value	Significance
Avoca (Railway House)	Australia	Record daily precipitation	43.2 mm (1.7 in)	78 of 100 (Major)
Haines AP	United States	Record daily precipitation	60.2 mm (2.4 in)	77 of 100 (Major)
Ormley	Australia	Record daily precipitation	71.0 mm (2.8 in)	73 of 100 (Major)
Cape Barren Island (Cape Barre	Australia	Record daily precipitation	34.8 mm (1.4 in)	72 of 100 (Major)
Lewis Hill (St Pauls River)	Australia	Record daily precipitation	73.0 mm (2.9 in)	71 of 100 (Major)
St Marys (Cullenswood)	Australia	Record daily precipitation	124.4 mm (4.9 in)	70 of 100 (Major)
Eddystone Point	Australia	Record daily precipitation	80.2 mm (3.2 in)	70 of 100 (Major)
Winamac 2SSE	United States	Record daily precipitation	71.4 mm (2.8 in)	70 of 100 (Major)
Mullen 3S	United States	Record daily snowfall	15.2 cm (6.0 in)	70 of 100 (Major)
Mathinna (Fingal Road)	Australia	Record daily precipitation	105.0 mm (4.1 in)	67 of 100 (Major)
Bridgeport 5 NW	United States	Record daily precipitation	74.9 mm (2.9 in)	66 of 100 (Major)
Sitka AP	United States	Record daily precipitation	45.5 mm (1.8 in)	63 of 100 (Major)
Pioneer (Main Road)	Australia	Record daily precipitation	78.6 mm (3.1 in)	62 of 100 (Major)
Juneau AP	United States	Record daily precipitation	38.9 mm (1.5 in)	62 of 100 (Major)
Petersburg 1	United States	Record daily precipitation	68.3 mm (2.7 in)	62 of 100 (Major)
Maria Island (Darlington)	Australia	Record daily precipitation	49.6 mm (2.0 in)	61 of 100 (Major)
Gainesville	United States	Record daily precipitation	56.6 mm (2.2 in)	60 of 100 (Major)
Montezuma 2 NW	United States	Record daily precipitation	66.0 mm (2.6 in)	57 of 100 (Notable)
Bridgewater Hydro	United States	Record daily precipitation	77.5 mm (3.1 in)	57 of 100 (Notable)
Santuck	United States	Record daily precipitation	59.4 mm (2.3 in)	56 of 100 (Notable)
Asheville	United States	Record daily precipitation	60.7 mm (2.4 in)	56 of 100 (Notable)
South Mount Cameron (Gladstone	Australia	Record daily precipitation	74.8 mm (2.9 in)	54 of 100 (Notable)
Mt Clemens Ang Base	United States	Record daily precipitation	32.8 mm (1.3 in)	54 of 100 (Notable)
Gladstone (Old Post Office)	Australia	Record daily precipitation	83.0 mm (3.3 in)	53 of 100 (Notable)
Pyengana (Forest Lodge Road)	Australia	Record daily precipitation	142.0 mm (5.6 in)	53 of 100 (Notable)
Hartwell	United States	Record daily precipitation	50.8 mm (2.0 in)	53 of 100 (Notable)
Lake Leake (Elizabeth River)	Australia	Record daily precipitation	48.2 mm (1.9 in)	52 of 100 (Notable)
Tooms Lake (Tooms River)	Australia	Record daily precipitation	39.4 mm (1.6 in)	52 of 100 (Notable)
Laredo 2	United States	Record daily precipitation	103.6 mm (4.1 in)	51 of 100 (Notable)
Yakutat AP	United States	Record daily precipitation	82.6 mm (3.3 in)	51 of 100 (Notable)
Kremmling	United States	Record snow depth	10.2 cm (4.0 in)	50 of 100 (Notable)
Coles Bay (Freycinet)	Australia	Record daily precipitation	41.5 mm (1.6 in)	49 of 100 (Notable)
Breckenridge	United States	Record snow depth	38.1 cm (15.0 in)	49 of 100 (Notable)
Asheville AP	United States	Record daily precipitation	56.9 mm (2.2 in)	49 of 100 (Notable)
Selma	United States	Record daily precipitation	56.4 mm (2.2 in)	47 of 100 (Notable)
Carrollton	United States	Record daily precipitation	61.5 mm (2.4 in)	47 of 100 (Notable)
Flandreau	United States	Record low maximum temperature	5.0 C (41.0 F)	47 of 100 (Notable)
Wessington Springs	United States	Record low maximum temperature	5.6 C (42.1 F)	47 of 100 (Notable)
Warsaw Markland Dam	United States	Record daily precipitation	63.5 mm (2.5 in)	46 of 100 (Notable)
Culbertson	United States	Record low maximum temperature	7.2 C (45.0 F)	46 of 100 (Notable)
Lynch	United States	Record low maximum temperature	7.8 C (46.0 F)	46 of 100 (Notable)
Tyndall	United States	Record low maximum temperature	7.2 C (45.0 F)	46 of 100 (Notable)
Sabinal	United States	Record daily precipitation	48.3 mm (1.9 in)	46 of 100 (Notable)
Tomahawk (Carisbrooke)	Australia	Record daily precipitation	59.4 mm (2.3 in)	45 of 100 (Notable)
Jacksonville	United States	Record daily precipitation	71.4 mm (2.8 in)	45 of 100 (Notable)
Logansport	United States	Record daily precipitation	53.6 mm (2.1 in)	45 of 100 (Notable)
Pipestone	United States	Record low maximum temperature	5.6 C (42.1 F)	45 of 100 (Notable)
Brookings 2 NE	United States	Record low maximum temperature	5.6 C (42.1 F)	45 of 100 (Notable)
Forestburg 4 NNE	United States	Record low maximum temperature	7.2 C (45.0 F)	45 of 100 (Notable)
Tamworth (Hillgrove)	Australia	Record daily precipitation	65.4 mm (2.6 in)	44 of 100 (Notable)
Alexander City	United States	Record daily precipitation	70.4 mm (2.8 in)	44 of 100 (Notable)
Marion 2 N	United States	Record daily precipitation	33.5 mm (1.3 in)	44 of 100 (Notable)
Albion	United States	Record daily precipitation	49.3 mm (1.9 in)	44 of 100 (Notable)
Windom	United States	Record low maximum temperature	6.7 C (44.1 F)	44 of 100 (Notable)
Academy 2NE	United States	Record low maximum temperature	6.1 C (43.0 F)	44 of 100 (Notable)
Vermillion 2 SE	United States	Record low maximum temperature	9.4 C (48.9 F)	44 of 100 (Notable)
Hayes Center 1NW	United States	Record low maximum temperature	6.1 C (43.0 F)	44 of 100 (Notable)
Lorinna	Australia	Record daily precipitation	31.0 mm (1.2 in)	43 of 100 (Notable)
German Town	Australia	Record daily precipitation	89.0 mm (3.5 in)	43 of 100 (Notable)
Hastings Dam 2	United States	Record daily precipitation	32.3 mm (1.3 in)	43 of 100 (Notable)

Counts by Type and Timescale

780 records

Records set or tied on 21 May 2017 by type: Highest daily maximum 93, Lowest daily maximum 194, Highest daily minimum 128, Lowest daily minimum 95, Heaviest daily rainfall 258, Heaviest daily snowfall 2, Deepest snow cover 10.

Records on 21 May 2017 by type
Record type	Records
Highest daily maximum	93
Lowest daily maximum	194
Highest daily minimum	128
Lowest daily minimum	95
Heaviest daily rainfall	258
Heaviest daily snowfall	2
Deepest snow cover	10

Records on 21 May 2017 by timescale: all-time 0, monthly 18, daily 762.

How Much Records Were Beaten By

639 broken records

Margins by which the 639 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 356.0. Ties are not counted.

Top 20 by Significance

21 May 2017

Top 20 records on 21 May 2017 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 May 2017	Avoca (Railway House), AU	daily rain	43.2 mm (1.7 in)	30.8 mm (1.2 in)	94 years	78 of 100 (Major)
21 May 2017	Haines AP, US	monthly rain	60.2 mm (2.4 in)	23.1 mm (0.9 in)	72 years	77 of 100 (Major)
21 May 2017	Ormley, AU	daily rain	71.0 mm (2.8 in)	60.3 mm (2.4 in)	78 years	73 of 100 (Major)
21 May 2017	Cape Barren Island (Cape Barre, AU	daily rain	34.8 mm (1.4 in)	23.4 mm (0.9 in)	110 years	72 of 100 (Major)
21 May 2017	Lewis Hill (St Pauls River), AU	daily rain	73.0 mm (2.9 in)	59.0 mm (2.3 in)	78 years	71 of 100 (Major)
21 May 2017	St Marys (Cullenswood), AU	daily rain	124.4 mm (4.9 in)	101.5 mm (4.0 in)	67 years	70 of 100 (Major)
21 May 2017	Eddystone Point, AU	daily rain	80.2 mm (3.2 in)	45.4 mm (1.8 in)	67 years	70 of 100 (Major)
21 May 2017	Winamac 2SSE, US	daily rain	71.4 mm (2.8 in)	41.4 mm (1.6 in)	70 years	70 of 100 (Major)
21 May 2017	Mullen 3S, US	daily snowfall	15.2 cm (6.0 in)	15.2 cm (6.0 in)	120 years	70 of 100 (Major)
21 May 2017	Mathinna (Fingal Road), AU	daily rain	105.0 mm (4.1 in)	41.5 mm (1.6 in)	78 years	67 of 100 (Major)
21 May 2017	Bridgeport 5 NW, US	daily rain	74.9 mm (2.9 in)	36.3 mm (1.4 in)	116 years	66 of 100 (Major)
21 May 2017	Sitka AP, US	daily rain	45.5 mm (1.8 in)	33.1 mm (1.3 in)	60 years	63 of 100 (Major)
21 May 2017	Pioneer (Main Road), AU	daily rain	78.6 mm (3.1 in)	52.6 mm (2.1 in)	40 years	62 of 100 (Major)
21 May 2017	Juneau AP, US	daily rain	38.9 mm (1.5 in)	29.0 mm (1.1 in)	48 years	62 of 100 (Major)
21 May 2017	Petersburg 1, US	daily rain	68.3 mm (2.7 in)	40.9 mm (1.6 in)	44 years	62 of 100 (Major)
21 May 2017	Maria Island (Darlington), AU	daily rain	49.6 mm (2.0 in)	36.4 mm (1.4 in)	54 years	61 of 100 (Major)
21 May 2017	Gainesville, US	daily rain	56.6 mm (2.2 in)	29.9 mm (1.2 in)	96 years	60 of 100 (Major)
21 May 2017	Montezuma 2 NW, US	daily rain	66.0 mm (2.6 in)	28.2 mm (1.1 in)	88 years	57 of 100 (Notable)
21 May 2017	Bridgewater Hydro, US	daily rain	77.5 mm (3.1 in)	48.5 mm (1.9 in)	44 years	57 of 100 (Notable)
21 May 2017	Santuck, US	daily rain	59.4 mm (2.3 in)	21.3 mm (0.8 in)	116 years	56 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 2017

Records set or tied on this calendar date in each year from 1793 to 2017. 2017 had 780 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 2017-05-21: 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 50	623
50 to 100	10
100 to 150	3
150 to 200	2
200 to 250	0
250 to 300	0
300 to 350	0
350 to 400	1