Weather Records on 1 May 1981

1,265 weather records were set or tied worldwide on 1 May 1981. Highest significance: San Blas, MX.

Key Facts for 1 May 1981

On 1 May 1981, 1,265 weather records were set or tied at long-record stations worldwide.
837 were record highs and 109 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 51 monthly and 1,214 daily.
San Blas set a monthly record daily precipitation of 50.8 mm (2.0 in) on 1 May 1981.
Across 165 earlier years (1795 to 2026) the same calendar date averaged 437 records.

Record Map

1,265 stations

1,265 station records on 1 May 1981 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 1 May 1981: highest significance records shown on the map
Station	Country	Type	Value	Significance
San Blas	Mexico	Record daily precipitation	50.8 mm (2.0 in)	60 of 100 (Major)
Ixmiquilpan (Smn)	Mexico	Record daily precipitation	48.8 mm (1.9 in)	56 of 100 (Notable)
Acambaro	Mexico	Record daily precipitation	41.1 mm (1.6 in)	55 of 100 (Notable)
Glenwood	United States	Record daily precipitation	49.5 mm (1.9 in)	55 of 100 (Notable)
Carrizo Springs 3S	United States	Record daily precipitation	131.3 mm (5.2 in)	55 of 100 (Notable)
Kara-Bagaz-Gol	Turkmenistan	Record daily precipitation	32.9 mm (1.3 in)	53 of 100 (Notable)
Buckhorn	United States	Record daily precipitation	26.7 mm (1.1 in)	53 of 100 (Notable)
Waiahole 837	United States	Record daily precipitation	96.0 mm (3.8 in)	52 of 100 (Notable)
Sogndal - Selseng	Norway	Record snow depth	123.0 cm (48.4 in)	51 of 100 (Notable)
Ozernaja	Russia	Record daily precipitation	29.4 mm (1.2 in)	51 of 100 (Notable)
Carlos Chagas	Brazil	Record daily precipitation	44.0 mm (1.7 in)	49 of 100 (Notable)
Tkvarcheli	Georgia	Record daily precipitation	86.7 mm (3.4 in)	49 of 100 (Notable)
Hofors	Sweden	Record daily precipitation	26.2 mm (1.0 in)	47 of 100 (Notable)
Hana AP 355	United States	Record daily precipitation	96.5 mm (3.8 in)	47 of 100 (Notable)
Taos	United States	Record high minimum temperature	12.8 C (55.0 F)	46 of 100 (Notable)
Juarez (Smn)	Mexico	Record daily precipitation	30.7 mm (1.2 in)	45 of 100 (Notable)
Chimoio	Mozambique	Record daily precipitation	32.9 mm (1.3 in)	44 of 100 (Notable)
Buckhannon	United States	Record daily precipitation	39.1 mm (1.5 in)	44 of 100 (Notable)
Haleakala Exp Farm 434	United States	Record daily precipitation	128.0 mm (5.0 in)	44 of 100 (Notable)
Keahua 410	United States	Record daily precipitation	37.3 mm (1.5 in)	44 of 100 (Notable)
Superior	United States	Record daily precipitation	26.9 mm (1.1 in)	43 of 100 (Notable)
Paia 406	United States	Record daily precipitation	31.5 mm (1.2 in)	43 of 100 (Notable)
Banff	Canada	Record high minimum temperature	7.0 C (44.6 F)	42 of 100 (Notable)
Haleakala Rch 432	United States	Record daily precipitation	77.2 mm (3.0 in)	42 of 100 (Notable)
Port Hastings	Canada	Record high minimum temperature	4.5 C (40.1 F)	40 of 100 (Notable)
Bontfontein	South Africa	Record daily precipitation	30.0 mm (1.2 in)	40 of 100 (Notable)
Ft Bidwell	United States	Record high minimum temperature	11.1 C (52.0 F)	40 of 100 (Notable)
Virginia City	United States	Record high maximum temperature	27.2 C (81.0 F)	40 of 100 (Notable)
Haleakala Rs 338	United States	Record daily precipitation	37.3 mm (1.5 in)	40 of 100 (Notable)
Spreckelsville 400	United States	Record daily precipitation	26.9 mm (1.1 in)	39 of 100 (Notable)
Elko Rgnl AP	United States	Record high maximum temperature	31.1 C (88.0 F)	39 of 100 (Notable)
Coeur D'Alene	United States	Record high minimum temperature	13.9 C (57.0 F)	38 of 100 (Notable)
Sable Island	Canada	Record daily precipitation	65.4 mm (2.6 in)	37 of 100 (Notable)
Ex Hacienda San Diego	Mexico	Record high minimum temperature	21.7 C (71.1 F)	37 of 100 (Notable)
Snowflake	United States	Record high minimum temperature	13.3 C (55.9 F)	37 of 100 (Notable)
Samalayuca	Mexico	Record daily precipitation	37.8 mm (1.5 in)	35 of 100 (Notable)
Rangely 1E	United States	Record high maximum temperature	28.9 C (84.0 F)	35 of 100 (Notable)
Dyer 5S	United States	Record high maximum temperature	30.6 C (87.1 F)	35 of 100 (Notable)
Vernal	United States	Record high maximum temperature	31.1 C (88.0 F)	35 of 100 (Notable)
Ellensburg	United States	Record high maximum temperature	31.7 C (89.1 F)	35 of 100 (Notable)
Pomeroy	United States	Record high minimum temperature	13.9 C (57.0 F)	35 of 100 (Notable)
Enderby	Canada	Record high minimum temperature	11.0 C (51.8 F)	34 of 100 (Routine)
San Luis Potosi (Dge)	Mexico	Record daily precipitation	30.0 mm (1.2 in)	34 of 100 (Routine)
Nevada City	United States	Record high minimum temperature	11.7 C (53.1 F)	34 of 100 (Routine)
Kooskia	United States	Record high minimum temperature	15.0 C (59.0 F)	34 of 100 (Routine)
Iron Mtn-Kingsford Wwtp	United States	Record daily snowfall	5.1 cm (2.0 in)	34 of 100 (Routine)
Luna Rs	United States	Record high minimum temperature	4.4 C (39.9 F)	34 of 100 (Routine)
Tooele	United States	Record high maximum temperature	30.0 C (86.0 F)	34 of 100 (Routine)
Colfax	United States	Record high maximum temperature	30.0 C (86.0 F)	34 of 100 (Routine)
Dayton 1 WSW	United States	Record high minimum temperature	13.9 C (57.0 F)	34 of 100 (Routine)
Hamakuapoko 485	United States	Record daily precipitation	38.9 mm (1.5 in)	34 of 100 (Routine)
Palmerville	Australia	Record low minimum temperature	15.0 C (59.0 F)	33 of 100 (Routine)
Kern River Ph 1	United States	Record high minimum temperature	21.1 C (70.0 F)	33 of 100 (Routine)
Collbran	United States	Record high maximum temperature	27.8 C (82.0 F)	33 of 100 (Routine)
Blackfoot Fire Dept	United States	Record high maximum temperature	27.8 C (82.0 F)	33 of 100 (Routine)
Moscow U of I	United States	Record high minimum temperature	12.2 C (54.0 F)	33 of 100 (Routine)
Libby 1 NE Rs	United States	Record high minimum temperature	9.4 C (48.9 F)	33 of 100 (Routine)
Manti	United States	Record high maximum temperature	28.3 C (82.9 F)	33 of 100 (Routine)
Ogden Pioneer Ph	United States	Record high maximum temperature	30.0 C (86.0 F)	33 of 100 (Routine)
Butte Bert Mooney AP	United States	Record high maximum temperature	24.4 C (75.9 F)	33 of 100 (Routine)

Counts by Type and Timescale

1,265 records

Records set or tied on 1 May 1981 by type: Highest daily maximum 471, Lowest daily maximum 89, Highest daily minimum 366, Lowest daily minimum 20, Heaviest daily rainfall 306, Heaviest daily snowfall 8, Deepest snow cover 5.

Records on 1 May 1981 by type
Record type	Records
Highest daily maximum	471
Lowest daily maximum	89
Highest daily minimum	366
Lowest daily minimum	20
Heaviest daily rainfall	306
Heaviest daily snowfall	8
Deepest snow cover	5

Records on 1 May 1981 by timescale: all-time 0, monthly 51, daily 1,214.

How Much Records Were Beaten By

1,041 broken records

Margins by which the 1,041 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 230.0. Ties are not counted.

Top 20 by Significance

1 May 1981

Top 20 records on 1 May 1981 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
1 May 1981	San Blas, MX	monthly rain	50.8 mm (2.0 in)	35.1 mm (1.4 in)	39 years	60 of 100 (Major)
1 May 1981	Ixmiquilpan (Smn), MX	daily rain	48.8 mm (1.9 in)	36.9 mm (1.5 in)	40 years	56 of 100 (Notable)
1 May 1981	Acambaro, MX	daily rain	41.1 mm (1.6 in)	31.7 mm (1.2 in)	38 years	55 of 100 (Notable)
1 May 1981	Glenwood, US	monthly rain	49.5 mm (1.9 in)	24.4 mm (1.0 in)	7 years	55 of 100 (Notable)
1 May 1981	Carrizo Springs 3S, US	monthly rain	131.3 mm (5.2 in)	43.7 mm (1.7 in)	41 years	55 of 100 (Notable)
1 May 1981	Kara-Bagaz-Gol, TM	daily rain	32.9 mm (1.3 in)	30.3 mm (1.2 in)	32 years	53 of 100 (Notable)
1 May 1981	Buckhorn, US	monthly rain	26.7 mm (1.1 in)	12.7 mm (0.5 in)	32 years	53 of 100 (Notable)
1 May 1981	Waiahole 837, US	daily rain	96.0 mm (3.8 in)	73.1 mm (2.9 in)	32 years	52 of 100 (Notable)
1 May 1981	Sogndal - Selseng, NO	monthly snow depth	123.0 cm (48.4 in)	23.0 cm (9.1 in)	78 years	51 of 100 (Notable)
1 May 1981	Ozernaja, RU	daily rain	29.4 mm (1.2 in)	22.1 mm (0.9 in)	26 years	51 of 100 (Notable)
1 May 1981	Carlos Chagas, BR	daily rain	44.0 mm (1.7 in)	28.4 mm (1.1 in)	23 years	49 of 100 (Notable)
1 May 1981	Tkvarcheli, GE	daily rain	86.7 mm (3.4 in)	51.2 mm (2.0 in)	40 years	49 of 100 (Notable)
1 May 1981	Hofors, SE	daily rain	26.2 mm (1.0 in)	17.6 mm (0.7 in)	14 years	47 of 100 (Notable)
1 May 1981	Hana AP 355, US	daily rain	96.5 mm (3.8 in)	59.9 mm (2.4 in)	16 years	47 of 100 (Notable)
1 May 1981	Taos, US	daily high min	12.8 C (55.0 F)	5.0 C (9.0 F)	76 years	46 of 100 (Notable)
1 May 1981	Juarez (Smn), MX	daily rain	30.7 mm (1.2 in)	24.3 mm (1.0 in)	3 years	45 of 100 (Notable)
1 May 1981	Chimoio, MZ	daily rain	32.9 mm (1.3 in)	24.6 mm (1.0 in)	14 years	44 of 100 (Notable)
1 May 1981	Buckhannon, US	daily rain	39.1 mm (1.5 in)	16.2 mm (0.6 in)	60 years	44 of 100 (Notable)
1 May 1981	Haleakala Exp Farm 434, US	daily rain	128.0 mm (5.0 in)	65.3 mm (2.6 in)	0 years	44 of 100 (Notable)
1 May 1981	Keahua 410, US	daily rain	37.3 mm (1.5 in)	28.9 mm (1.1 in)	0 years	44 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

1795 to 1981

Records set or tied on this calendar date in each year from 1795 to 1981. 1981 had 1,265 records.

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

Records on 05-01 in each year
Year	Records
1795	1
1802	1
1804	1
1814	1
1818	1
1835	1
1836	1
1840	1
1846	2
1847	1
1850	1
1851	1
1857	1
1860	1
1861	1
1864	2
1865	1
1868	2
1872	1
1875	4
1878	2
1879	2
1880	3
1881	2
1884	1
1885	1
1886	2
1887	2
1888	2
1889	3
1890	2
1891	5
1892	6
1893	2
1894	5
1896	1
1897	4
1898	1
1899	8
1900	1
1901	5
1902	7
1903	9
1904	9
1905	13
1906	12
1907	31
1908	20
1909	49
1910	13
1911	22
1912	18
1913	54
1914	23
1915	27
1916	27
1917	37
1918	34
1919	150
1920	186
1921	41
1922	92
1923	64
1924	63
1925	118
1926	500
1927	125
1928	190
1929	142
1930	263
1931	537
1932	220
1933	706
1934	305
1935	276
1936	368
1937	218
1938	304
1939	227
1940	731
1941	333
1942	1,036
1943	526
1944	229
1945	350
1946	415
1947	655
1948	774
1949	405
1950	439
1951	894
1952	557
1953	917
1954	1,506
1955	772
1956	1,106
1957	359
1958	448
1959	764
1960	737
1961	588
1962	615
1963	704
1964	312
1965	360
1966	707
1967	948
1968	426
1969	429
1970	1,075
1971	444
1972	562
1973	841
1974	589
1975	286
1976	673
1977	545
1978	1,202
1979	612
1980	507
1981	1,265
1982	508
1983	1,423
1984	640
1985	789
1986	512
1987	1,098
1988	1,058
1989	949
1990	922
1991	633
1992	1,201
1993	1,101
1994	1,210
1995	1,365
1996	1,439
1997	804
1998	951
1999	932
2000	809
2001	1,106
2002	1,221
2003	964
2004	887
2005	1,320
2006	734
2007	857
2008	979
2009	679
2010	1,151
2011	716
2012	796
2013	976
2014	941
2015	550
2016	844
2017	1,163
2018	519
2019	788
2020	1,099
2021	834
2022	319
2023	913
2024	458
2025	430
2026	623

Download the Data

Data for records on 1981-05-01: 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 50	1,035
50 to 100	5
100 to 150	0
150 to 200	0
200 to 250	1