Weather Records on 21 May 1927

207 weather records were set or tied worldwide on 21 May 1927. Highest significance: Geilo, NO.

Key Facts for 21 May 1927

On 21 May 1927, 207 weather records were set or tied at long-record stations worldwide.
116 were record highs and 58 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 7 monthly and 200 daily.
Geilo set a daily record snow depth of 132.0 cm (52.0 in) on 21 May 1927.
Across 156 earlier years (1793 to 2026) the same calendar date averaged 462 records.

Record Map

207 stations

207 station records on 21 May 1927 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 May 1927: highest significance records shown on the map
Station	Country	Type	Value	Significance
Geilo	Norway	Record snow depth	132.0 cm (52.0 in)	43 of 100 (Notable)
Napoleon	United States	Record daily precipitation	38.1 mm (1.5 in)	30 of 100 (Routine)
Franklin	United States	Record high minimum temperature	21.7 C (71.1 F)	24 of 100 (Routine)
Lexington Bluegrass AP	United States	Record high maximum temperature	32.2 C (90.0 F)	24 of 100 (Routine)
Broken Bow 2 W	United States	Record high minimum temperature	21.7 C (71.1 F)	23 of 100 (Routine)
Moncure 3 SE	United States	Record high minimum temperature	21.7 C (71.1 F)	23 of 100 (Routine)
Tooele	United States	Record low maximum temperature	5.6 C (42.1 F)	23 of 100 (Routine)
Orono	United States	Record low minimum temperature	-6.7 C (19.9 F)	22 of 100 (Routine)
Great Falls 16St	United States	Record daily precipitation	28.7 mm (1.1 in)	22 of 100 (Routine)
Spooner Ag Rsch STN	United States	Record daily precipitation	38.1 mm (1.5 in)	22 of 100 (Routine)
Saegerstown	United States	Record daily precipitation	27.9 mm (1.1 in)	21 of 100 (Routine)
Deseret	United States	Record low maximum temperature	9.4 C (48.9 F)	21 of 100 (Routine)
Paragonah	United States	Record low maximum temperature	7.8 C (46.0 F)	21 of 100 (Routine)
Surgut	Russia	Record daily precipitation	23.7 mm (0.9 in)	20 of 100 (Routine)
Karlshamn	Sweden	Record daily precipitation	17.4 mm (0.7 in)	20 of 100 (Routine)
Helena Wb City	United States	Record daily snowfall	4.1 cm (1.6 in)	20 of 100 (Routine)
Swift Current	Canada	Record low maximum temperature	6.1 C (43.0 F)	20 of 100 (Routine)
Tobolsk	Russia	Record daily precipitation	14.0 mm (0.6 in)	20 of 100 (Routine)
Tarpon Spgs Sewage Plt	United States	Record high maximum temperature	36.7 C (98.1 F)	20 of 100 (Routine)
Albion	United States	Record high minimum temperature	20.6 C (69.1 F)	20 of 100 (Routine)
Gothenburg	United States	Record high minimum temperature	21.7 C (71.1 F)	20 of 100 (Routine)
Boras	Sweden	Record low maximum temperature	9.0 C (48.2 F)	18 of 100 (Routine)
Varberg	Sweden	Record daily precipitation	7.8 mm (0.31 in)	17 of 100 (Routine)
Ulricehamn	Sweden	Record daily precipitation	6.0 mm (0.24 in)	17 of 100 (Routine)
Austin #2	United States	Record low maximum temperature	2.8 C (37.0 F)	17 of 100 (Routine)
Lakeview 2 NNW	United States	Record low maximum temperature	4.4 C (39.9 F)	17 of 100 (Routine)
Middlesboro Fire Dept	United States	Record high maximum temperature	33.9 C (93.0 F)	16 of 100 (Routine)
Austin #2	United States	Record low minimum temperature	-3.9 C (25.0 F)	16 of 100 (Routine)
Brookings 2 NE	United States	Record daily precipitation	35.6 mm (1.4 in)	16 of 100 (Routine)
Fillmore	United States	Record low maximum temperature	9.4 C (48.9 F)	16 of 100 (Routine)
New Orleans Audubon	United States	Record low maximum temperature	23.3 C (73.9 F)	16 of 100 (Routine)
Elko Rgnl AP	United States	Record low maximum temperature	9.4 C (48.9 F)	16 of 100 (Routine)
Winnemucca AP	United States	Record low minimum temperature	-1.7 C (28.9 F)	16 of 100 (Routine)
Mildura Post Office	Australia	Record low minimum temperature	-2.8 C (27.0 F)	15 of 100 (Routine)
Pakri	Estonia	Record daily precipitation	4.7 mm (0.19 in)	15 of 100 (Routine)
Milbank 4 NW	United States	Record daily precipitation	20.1 mm (0.8 in)	15 of 100 (Routine)
Burkes Garden	United States	Record high minimum temperature	16.7 C (62.1 F)	15 of 100 (Routine)
Helena Wb City	United States	Record low maximum temperature	4.4 C (39.9 F)	15 of 100 (Routine)
Biskra	Algeria	Record high minimum temperature	24.0 C (75.2 F)	14 of 100 (Routine)
Independence	United States	Record low minimum temperature	2.2 C (36.0 F)	14 of 100 (Routine)
Tarpon Spgs Sewage Plt	United States	Record high minimum temperature	22.2 C (72.0 F)	14 of 100 (Routine)
St Ignace	United States	Record daily precipitation	14.5 mm (0.6 in)	14 of 100 (Routine)
Bird Island	United States	Record daily precipitation	45.2 mm (1.8 in)	14 of 100 (Routine)
Biloxi	United States	Record low maximum temperature	25.0 C (77.0 F)	14 of 100 (Routine)
Beaver City	United States	Record high minimum temperature	21.7 C (71.1 F)	14 of 100 (Routine)
Genoa 2 W	United States	Record high minimum temperature	21.1 C (70.0 F)	14 of 100 (Routine)
Portsmouth-Sciotoville	United States	Record high maximum temperature	35.0 C (95.0 F)	14 of 100 (Routine)
Trenton 1 NNE	United States	Record high maximum temperature	35.6 C (96.1 F)	14 of 100 (Routine)
Heber	United States	Record low maximum temperature	11.1 C (52.0 F)	14 of 100 (Routine)
Havre Wb City	United States	Record daily precipitation	23.6 mm (0.9 in)	14 of 100 (Routine)
Medicine Hat A	Canada	Record low maximum temperature	7.8 C (46.0 F)	13 of 100 (Routine)
Cape Norman	Canada	Record daily precipitation	8.9 mm (0.35 in)	13 of 100 (Routine)
Lamar	United States	Record high minimum temperature	17.2 C (63.0 F)	13 of 100 (Routine)
Tampa	United States	Record high maximum temperature	33.9 C (93.0 F)	13 of 100 (Routine)
Soldier Creek Adm Site	United States	Record low maximum temperature	6.1 C (43.0 F)	13 of 100 (Routine)
Columbus	United States	Record high minimum temperature	19.4 C (66.9 F)	13 of 100 (Routine)
McPherson	United States	Record high minimum temperature	20.6 C (69.1 F)	13 of 100 (Routine)
Calumet	United States	Record daily precipitation	21.6 mm (0.9 in)	13 of 100 (Routine)
Chinook	United States	Record low maximum temperature	5.6 C (42.1 F)	13 of 100 (Routine)
Columbia Falls 5 SW	United States	Record low maximum temperature	7.2 C (45.0 F)	13 of 100 (Routine)

Counts by Type and Timescale

207 records

Records set or tied on 21 May 1927 by type: Highest daily maximum 39, Lowest daily maximum 45, Highest daily minimum 77, Lowest daily minimum 13, Heaviest daily rainfall 31, Heaviest daily snowfall 1, Deepest snow cover 1.

Records on 21 May 1927 by type
Record type	Records
Highest daily maximum	39
Lowest daily maximum	45
Highest daily minimum	77
Lowest daily minimum	13
Heaviest daily rainfall	31
Heaviest daily snowfall	1
Deepest snow cover	1

Records on 21 May 1927 by timescale: all-time 0, monthly 7, daily 200.

How Much Records Were Beaten By

151 broken records

Margins by which the 151 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 1150.0. Ties are not counted.

Top 20 by Significance

21 May 1927

Top 20 records on 21 May 1927 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 May 1927	Geilo, NO	daily snow depth	132.0 cm (52.0 in)	115.0 cm (45.3 in)	0 years	43 of 100 (Notable)
21 May 1927	Napoleon, US	daily rain	38.1 mm (1.5 in)	13.7 mm (0.5 in)	33 years	30 of 100 (Routine)
21 May 1927	Franklin, US	monthly high min	21.7 C (71.1 F)	0.6 C (1.1 F)	31 years	24 of 100 (Routine)
21 May 1927	Lexington Bluegrass AP, US	daily high max	32.2 C (90.0 F)	2.2 C (4.0 F)	50 years	24 of 100 (Routine)
21 May 1927	Broken Bow 2 W, US	monthly high min	21.7 C (71.1 F)	0.6 C (1.1 F)	32 years	23 of 100 (Routine)
21 May 1927	Moncure 3 SE, US	monthly high min	21.7 C (71.1 F)	0.6 C (1.1 F)	30 years	23 of 100 (Routine)
21 May 1927	Tooele, US	daily low max	5.6 C (42.1 F)	7.2 C (13.0 F)	24 years	23 of 100 (Routine)
21 May 1927	Orono, US	daily low min	-6.7 C (19.9 F)	5.0 C (9.0 F)	24 years	22 of 100 (Routine)
21 May 1927	Great Falls 16St, US	daily rain	28.7 mm (1.1 in)	7.1 mm (0.28 in)	33 years	22 of 100 (Routine)
21 May 1927	Spooner Ag Rsch STN, US	daily rain	38.1 mm (1.5 in)	21.6 mm (0.9 in)	12 years	22 of 100 (Routine)
21 May 1927	Saegerstown, US	daily rain	27.9 mm (1.1 in)	12.9 mm (0.5 in)	12 years	21 of 100 (Routine)
21 May 1927	Deseret, US	daily low max	9.4 C (48.9 F)	4.5 C (8.1 F)	33 years	21 of 100 (Routine)
21 May 1927	Paragonah, US	daily low max	7.8 C (46.0 F)	4.4 C (7.9 F)	33 years	21 of 100 (Routine)
21 May 1927	Surgut, RU	daily rain	23.7 mm (0.9 in)	20.1 mm (0.8 in)	33 years	20 of 100 (Routine)
21 May 1927	Karlshamn, SE	daily rain	17.4 mm (0.7 in)	12.1 mm (0.5 in)	39 years	20 of 100 (Routine)
21 May 1927	Helena Wb City, US	daily snowfall	4.1 cm (1.6 in)	4.1 cm (1.6 in)	33 years	20 of 100 (Routine)
21 May 1927	Swift Current, CA	daily low max	6.1 C (43.0 F)	3.3 C (5.9 F)	39 years	20 of 100 (Routine)
21 May 1927	Tobolsk, RU	daily rain	14.0 mm (0.6 in)	7.3 mm (0.29 in)	8 years	20 of 100 (Routine)
21 May 1927	Tarpon Spgs Sewage Plt, US	daily high max	36.7 C (98.1 F)	2.8 C (5.0 F)	22 years	20 of 100 (Routine)
21 May 1927	Albion, US	daily high min	20.6 C (69.1 F)	6.2 C (11.2 F)	20 years	20 of 100 (Routine)

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 1927

Records set or tied on this calendar date in each year from 1793 to 1927. 1927 had 207 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 1927-05-21: 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 200	150
200 to 400	0
400 to 600	0
600 to 800	0
800 to 1000	0
1000 to 1200	1