Weather Records on 21 May 1977

756 weather records were set or tied worldwide on 21 May 1977. Highest significance: Moorleah (Preolenna Road), AU.

Key Facts for 21 May 1977

On 21 May 1977, 756 weather records were set or tied at long-record stations worldwide.
284 were record highs and 99 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 44 monthly and 710 daily.
Moorleah (Preolenna Road) set a daily record precipitation of 51.8 mm (2.0 in) on 21 May 1977.
Across 156 earlier years (1793 to 2026) the same calendar date averaged 458 records.

Record Map

756 stations

756 station records on 21 May 1977 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 May 1977: highest significance records shown on the map
Station	Country	Type	Value	Significance
Moorleah (Preolenna Road)	Australia	Record daily precipitation	51.8 mm (2.0 in)	64 of 100 (Major)
Carnegie 5 NE	United States	Record daily precipitation	101.6 mm (4.0 in)	62 of 100 (Major)
Perry	United States	Record daily precipitation	133.1 mm (5.2 in)	62 of 100 (Major)
El Reno 1 N	United States	Record daily precipitation	106.4 mm (4.2 in)	60 of 100 (Major)
Clarendon	United States	Record daily precipitation	108.0 mm (4.3 in)	59 of 100 (Notable)
Norwich	United States	Record daily precipitation	95.5 mm (3.8 in)	57 of 100 (Notable)
Nenzel 20 S	United States	Record daily precipitation	59.4 mm (2.3 in)	56 of 100 (Notable)
Kennebec	United States	Record daily precipitation	54.6 mm (2.1 in)	56 of 100 (Notable)
Hampshire (Neena Road)	Australia	Record daily precipitation	71.2 mm (2.8 in)	55 of 100 (Notable)
Ewing	United States	Record daily precipitation	132.1 mm (5.2 in)	54 of 100 (Notable)
Plainview	United States	Record daily precipitation	96.5 mm (3.8 in)	54 of 100 (Notable)
Connorville (Lake River)	Australia	Record daily precipitation	35.4 mm (1.4 in)	53 of 100 (Notable)
Oatlands (Bow Hill)	Australia	Record daily precipitation	48.0 mm (1.9 in)	53 of 100 (Notable)
Mole Creek	Australia	Record daily precipitation	53.4 mm (2.1 in)	52 of 100 (Notable)
Ross (Ellinthorp)	Australia	Record daily precipitation	25.2 mm (1.0 in)	52 of 100 (Notable)
Attica 6 WNW	United States	Record daily precipitation	101.6 mm (4.0 in)	52 of 100 (Notable)
Alva 1W	United States	Record daily precipitation	98.6 mm (3.9 in)	52 of 100 (Notable)
Woodward	United States	Record daily precipitation	90.9 mm (3.6 in)	52 of 100 (Notable)
Reydon 2SSE	United States	Record daily precipitation	88.9 mm (3.5 in)	51 of 100 (Notable)
Waynoka	United States	Record daily precipitation	90.7 mm (3.6 in)	51 of 100 (Notable)
Richfield	United States	Record daily precipitation	63.5 mm (2.5 in)	50 of 100 (Notable)
Yolla (Sea View)	Australia	Record daily precipitation	62.2 mm (2.4 in)	49 of 100 (Notable)
Spencer 6 SSE	United States	Record daily precipitation	53.3 mm (2.1 in)	48 of 100 (Notable)
Naracoorte (Lochaber)	Australia	Record daily precipitation	28.8 mm (1.1 in)	47 of 100 (Notable)
South Nietta	Australia	Record daily precipitation	68.0 mm (2.7 in)	47 of 100 (Notable)
Ridgley	Australia	Record daily precipitation	49.0 mm (1.9 in)	47 of 100 (Notable)
Dijon-Longvic	France	Record daily precipitation	48.1 mm (1.9 in)	47 of 100 (Notable)
Newton	United States	Record daily precipitation	66.8 mm (2.6 in)	47 of 100 (Notable)
Tewkesbury	Australia	Record daily precipitation	69.8 mm (2.7 in)	46 of 100 (Notable)
Elgin	United States	Record daily precipitation	71.6 mm (2.8 in)	45 of 100 (Notable)
Alma	United States	Record high maximum temperature	33.9 C (93.0 F)	44 of 100 (Notable)
Stapleton 5 SSE	United States	Record daily precipitation	67.8 mm (2.7 in)	44 of 100 (Notable)
Watonga	United States	Record daily precipitation	67.6 mm (2.7 in)	44 of 100 (Notable)
Armour	United States	Record daily precipitation	53.1 mm (2.1 in)	44 of 100 (Notable)
Geneseo	United States	Record daily precipitation	58.4 mm (2.3 in)	43 of 100 (Notable)
Gothenburg	United States	Record daily precipitation	107.2 mm (4.2 in)	43 of 100 (Notable)
Enid	United States	Record daily precipitation	99.3 mm (3.9 in)	43 of 100 (Notable)
Lookeba 1 N	United States	Record daily precipitation	111.8 mm (4.4 in)	43 of 100 (Notable)
Winner	United States	Record daily precipitation	63.5 mm (2.5 in)	43 of 100 (Notable)
Grodno	Belarus	Record daily precipitation	53.1 mm (2.1 in)	42 of 100 (Notable)
Lynch	United States	Record daily precipitation	63.8 mm (2.5 in)	42 of 100 (Notable)
Canton	United States	Record daily precipitation	83.1 mm (3.3 in)	42 of 100 (Notable)
Wellfleet	United States	Record daily precipitation	41.9 mm (1.6 in)	41 of 100 (Notable)
Ft Supply 3SE	United States	Record daily precipitation	61.0 mm (2.4 in)	41 of 100 (Notable)
Dodgeville Wwtp	United States	Record daily precipitation	42.2 mm (1.7 in)	41 of 100 (Notable)
Cressy Research Station (Main	Australia	Record daily precipitation	32.8 mm (1.3 in)	40 of 100 (Notable)
Okeene	United States	Record daily precipitation	61.0 mm (2.4 in)	40 of 100 (Notable)
Liawenee Hec	Australia	Record daily precipitation	39.4 mm (1.6 in)	39 of 100 (Notable)
Leipzig-Holzhausen	Germany	Record low maximum temperature	9.3 C (48.7 F)	39 of 100 (Notable)
Abilene	United States	Record daily precipitation	41.4 mm (1.6 in)	39 of 100 (Notable)
Conway Springs 4SW	United States	Record daily precipitation	74.7 mm (2.9 in)	39 of 100 (Notable)
Hemlock	United States	Record high maximum temperature	33.3 C (91.9 F)	39 of 100 (Notable)
Lockport 2SE	United States	Record high minimum temperature	20.6 C (69.1 F)	39 of 100 (Notable)
South Forest (Plummers Road)	Australia	Record daily precipitation	29.2 mm (1.1 in)	38 of 100 (Notable)
Hudson	United States	Record daily precipitation	57.2 mm (2.3 in)	38 of 100 (Notable)
Roosevelt	United States	Record daily precipitation	76.2 mm (3.0 in)	38 of 100 (Notable)
Lynxville Dam 9	United States	Record daily precipitation	39.9 mm (1.6 in)	38 of 100 (Notable)
Wauneta	United States	Record daily precipitation	37.3 mm (1.5 in)	37 of 100 (Notable)
Woodward Fld STN	United States	Record daily precipitation	89.9 mm (3.5 in)	37 of 100 (Notable)
Academy 2NE	United States	Record daily precipitation	64.0 mm (2.5 in)	37 of 100 (Notable)

Counts by Type and Timescale

756 records

Records set or tied on 21 May 1977 by type: Highest daily maximum 194, Lowest daily maximum 51, Highest daily minimum 90, Lowest daily minimum 48, Heaviest daily rainfall 372, Heaviest daily snowfall 1.

Records on 21 May 1977 by type
Record type	Records
Highest daily maximum	194
Lowest daily maximum	51
Highest daily minimum	90
Lowest daily minimum	48
Heaviest daily rainfall	372
Heaviest daily snowfall	1
Deepest snow cover	0

Records on 21 May 1977 by timescale: all-time 2, monthly 44, daily 710.

How Much Records Were Beaten By

635 broken records

Margins by which the 635 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 86.1. Ties are not counted.

Top 20 by Significance

21 May 1977

Top 20 records on 21 May 1977 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 May 1977	Moorleah (Preolenna Road), AU	daily rain	51.8 mm (2.0 in)	35.5 mm (1.4 in)	60 years	64 of 100 (Major)
21 May 1977	Carnegie 5 NE, US	daily rain	101.6 mm (4.0 in)	75.7 mm (3.0 in)	55 years	62 of 100 (Major)
21 May 1977	Perry, US	daily rain	133.1 mm (5.2 in)	56.6 mm (2.2 in)	75 years	62 of 100 (Major)
21 May 1977	El Reno 1 N, US	daily rain	106.4 mm (4.2 in)	50.5 mm (2.0 in)	75 years	60 of 100 (Major)
21 May 1977	Clarendon, US	daily rain	108.0 mm (4.3 in)	71.2 mm (2.8 in)	43 years	59 of 100 (Notable)
21 May 1977	Norwich, US	daily rain	95.5 mm (3.8 in)	51.6 mm (2.0 in)	54 years	57 of 100 (Notable)
21 May 1977	Nenzel 20 S, US	daily rain	59.4 mm (2.3 in)	32.0 mm (1.3 in)	54 years	56 of 100 (Notable)
21 May 1977	Kennebec, US	daily rain	54.6 mm (2.1 in)	25.9 mm (1.0 in)	77 years	56 of 100 (Notable)
21 May 1977	Hampshire (Neena Road), AU	daily rain	71.2 mm (2.8 in)	35.9 mm (1.4 in)	60 years	55 of 100 (Notable)
21 May 1977	Ewing, US	all-time rain	132.1 mm (5.2 in)	27.2 mm (1.1 in)	10 years	54 of 100 (Notable)
21 May 1977	Plainview, US	daily rain	96.5 mm (3.8 in)	47.7 mm (1.9 in)	44 years	54 of 100 (Notable)
21 May 1977	Connorville (Lake River), AU	daily rain	35.4 mm (1.4 in)	25.7 mm (1.0 in)	38 years	53 of 100 (Notable)
21 May 1977	Oatlands (Bow Hill), AU	daily rain	48.0 mm (1.9 in)	21.6 mm (0.9 in)	66 years	53 of 100 (Notable)
21 May 1977	Mole Creek, AU	daily rain	53.4 mm (2.1 in)	34.9 mm (1.4 in)	60 years	52 of 100 (Notable)
21 May 1977	Ross (Ellinthorp), AU	daily rain	25.2 mm (1.0 in)	21.6 mm (0.9 in)	27 years	52 of 100 (Notable)
21 May 1977	Attica 6 WNW, US	daily rain	101.6 mm (4.0 in)	86.1 mm (3.4 in)	27 years	52 of 100 (Notable)
21 May 1977	Alva 1W, US	daily rain	98.6 mm (3.9 in)	59.2 mm (2.3 in)	16 years	52 of 100 (Notable)
21 May 1977	Woodward, US	daily rain	90.9 mm (3.6 in)	68.5 mm (2.7 in)	16 years	52 of 100 (Notable)
21 May 1977	Reydon 2SSE, US	daily rain	88.9 mm (3.5 in)	61.5 mm (2.4 in)	30 years	51 of 100 (Notable)
21 May 1977	Waynoka, US	daily rain	90.7 mm (3.6 in)	63.0 mm (2.5 in)	28 years	51 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 1977

Records set or tied on this calendar date in each year from 1793 to 1977. 1977 had 756 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 1977-05-21: 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 2026-10-12 (12 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	562
20 to 40	53
40 to 60	12
60 to 80	7
80 to 100	1