Weather Records on 23 May 1966

391 weather records were set or tied worldwide on 23 May 1966. Highest significance: Graz, AT.

Key Facts for 23 May 1966

On 23 May 1966, 391 weather records were set or tied at long-record stations worldwide.
158 were record highs and 130 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 17 monthly and 373 daily.
Graz set a daily record precipitation of 50.6 mm (2.0 in) on 23 May 1966.
Across 158 earlier years (1793 to 2026) the same calendar date averaged 463 records.

Record Map

391 stations

391 station records on 23 May 1966 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 23 May 1966: highest significance records shown on the map
Station	Country	Type	Value	Significance
Graz	Austria	Record daily precipitation	50.6 mm (2.0 in)	56 of 100 (Notable)
Fond du Lac Wwtp	United States	Record daily precipitation	78.2 mm (3.1 in)	52 of 100 (Notable)
Olho Dagua	Brazil	Record daily precipitation	111.6 mm (4.4 in)	49 of 100 (Notable)
Wahoo	United States	Record daily precipitation	80.0 mm (3.1 in)	48 of 100 (Notable)
Saidapet	India	Record daily precipitation	50.0 mm (2.0 in)	38 of 100 (Notable)
Primghar	United States	Record daily precipitation	32.5 mm (1.3 in)	38 of 100 (Notable)
Worthington	United States	Record daily precipitation	35.6 mm (1.4 in)	38 of 100 (Notable)
Kendall	United States	Record low minimum temperature	-16.7 C (1.9 F)	38 of 100 (Notable)
Audubon	United States	Record daily precipitation	34.8 mm (1.4 in)	37 of 100 (Notable)
Garden Valley	United States	Record low minimum temperature	-7.8 C (18.0 F)	36 of 100 (Notable)
Recanto	Brazil	Record daily precipitation	47.7 mm (1.9 in)	35 of 100 (Notable)
Ottawa 4SW	United States	Record daily precipitation	33.5 mm (1.3 in)	35 of 100 (Notable)
Cresco 1 NE	United States	Record daily precipitation	36.6 mm (1.4 in)	35 of 100 (Notable)
Humboldt 3 W	United States	Record daily precipitation	42.7 mm (1.7 in)	35 of 100 (Notable)
Waukesha Wwtp	United States	Record daily precipitation	33.5 mm (1.3 in)	35 of 100 (Notable)
Bedford 2 SE	United States	Record low minimum temperature	-7.8 C (18.0 F)	35 of 100 (Notable)
Brownwood 2NE	United States	Record high minimum temperature	23.9 C (75.0 F)	34 of 100 (Routine)
Border 3 N	United States	Record low minimum temperature	-9.4 C (15.1 F)	34 of 100 (Routine)
Usina Avanhandava (Cpfl)	Brazil	Record daily precipitation	38.7 mm (1.5 in)	33 of 100 (Routine)
Blackfoot Dam	United States	Record low minimum temperature	-13.3 C (8.1 F)	33 of 100 (Routine)
Harlan	United States	Record daily precipitation	28.7 mm (1.1 in)	33 of 100 (Routine)
Lake City	United States	Record daily precipitation	50.8 mm (2.0 in)	33 of 100 (Routine)
Fleming	United States	Record low maximum temperature	22.2 C (72.0 F)	32 of 100 (Routine)
Holdenville 2SSE	United States	Record high minimum temperature	26.1 C (79.0 F)	32 of 100 (Routine)
Aberdeen Exp STN	United States	Record low minimum temperature	-6.7 C (19.9 F)	31 of 100 (Routine)
Marion	United States	Record daily precipitation	72.6 mm (2.9 in)	31 of 100 (Routine)
Haskell	United States	Record high minimum temperature	23.3 C (73.9 F)	31 of 100 (Routine)
Ibapah	United States	Record low minimum temperature	-6.7 C (19.9 F)	31 of 100 (Routine)
American Falls 6 NE	United States	Record low minimum temperature	-3.3 C (26.1 F)	30 of 100 (Routine)
Brownwood 2NE	United States	Record high maximum temperature	40.0 C (104.0 F)	30 of 100 (Routine)
Bishop AP	United States	Record high minimum temperature	12.2 C (54.0 F)	30 of 100 (Routine)
Yakutat AP	United States	Record low maximum temperature	3.9 C (39.0 F)	29 of 100 (Routine)
Camargo (Smn)	Mexico	Record high minimum temperature	23.3 C (73.9 F)	28 of 100 (Routine)
Lebanon 2W	United States	Record high minimum temperature	21.1 C (70.0 F)	28 of 100 (Routine)
Blair	United States	Record daily precipitation	36.8 mm (1.4 in)	28 of 100 (Routine)
Elkin	United States	Record daily precipitation	85.1 mm (3.4 in)	28 of 100 (Routine)
Healdton 3 E	United States	Record high minimum temperature	22.2 C (72.0 F)	28 of 100 (Routine)
Grapevine Dam	United States	Record high minimum temperature	23.3 C (73.9 F)	28 of 100 (Routine)
Allison	United States	Record daily precipitation	43.7 mm (1.7 in)	27 of 100 (Routine)
Frankfort 2NE	United States	Record high minimum temperature	13.3 C (55.9 F)	27 of 100 (Routine)
Smithville	United States	Record high minimum temperature	23.9 C (75.0 F)	27 of 100 (Routine)
Wagoner	United States	Record high minimum temperature	22.8 C (73.0 F)	27 of 100 (Routine)
Georgetown	United States	Record high minimum temperature	22.8 C (73.0 F)	27 of 100 (Routine)
Blackfoot Fire Dept	United States	Record low minimum temperature	-5.0 C (23.0 F)	26 of 100 (Routine)
Lawrence	United States	Record high minimum temperature	21.7 C (71.1 F)	26 of 100 (Routine)
Summerville 4W	United States	Record low maximum temperature	22.2 C (72.0 F)	26 of 100 (Routine)
Morgan	United States	Record low minimum temperature	-4.4 C (24.1 F)	26 of 100 (Routine)
Oak City	United States	Record low minimum temperature	-1.1 C (30.0 F)	26 of 100 (Routine)
Evanston 1 E	United States	Record low minimum temperature	-8.9 C (16.0 F)	26 of 100 (Routine)
Saint Paul Is AP	United States	Record low minimum temperature	-4.4 C (24.1 F)	26 of 100 (Routine)
Fort George	Canada	Record high maximum temperature	23.9 C (75.0 F)	25 of 100 (Routine)
Ft Dodge 5NNW	United States	Record daily precipitation	37.6 mm (1.5 in)	25 of 100 (Routine)
Shenandoah	United States	Record daily precipitation	30.2 mm (1.2 in)	25 of 100 (Routine)
Fredonia	United States	Record high minimum temperature	21.7 C (71.1 F)	25 of 100 (Routine)
Montello 2NE	United States	Record low minimum temperature	-6.7 C (19.9 F)	25 of 100 (Routine)
Matanuska Exp Farm	United States	Record low maximum temperature	9.4 C (48.9 F)	25 of 100 (Routine)
Ashton 1N	United States	Record low minimum temperature	-6.7 C (19.9 F)	24 of 100 (Routine)
Pontiac	United States	Record daily precipitation	45.7 mm (1.8 in)	24 of 100 (Routine)
Belle Plaine	United States	Record daily precipitation	37.1 mm (1.5 in)	24 of 100 (Routine)
Columbus Junction	United States	Record daily precipitation	72.4 mm (2.9 in)	24 of 100 (Routine)

Counts by Type and Timescale

391 records

Records set or tied on 23 May 1966 by type: Highest daily maximum 65, Lowest daily maximum 24, Highest daily minimum 93, Lowest daily minimum 106, Heaviest daily rainfall 103.

Records on 23 May 1966 by type
Record type	Records
Highest daily maximum	65
Lowest daily maximum	24
Highest daily minimum	93
Lowest daily minimum	106
Heaviest daily rainfall	103
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 23 May 1966 by timescale: all-time 1, monthly 17, daily 373.

How Much Records Were Beaten By

297 broken records

Margins by which the 297 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 90.4. Ties are not counted.

Top 20 by Significance

23 May 1966

Top 20 records on 23 May 1966 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
23 May 1966	Graz, AT	daily rain	50.6 mm (2.0 in)	33.2 mm (1.3 in)	36 years	56 of 100 (Notable)
23 May 1966	Fond du Lac Wwtp, US	monthly rain	78.2 mm (3.1 in)	17.2 mm (0.7 in)	55 years	52 of 100 (Notable)
23 May 1966	Olho Dagua, BR	daily rain	111.6 mm (4.4 in)	90.4 mm (3.6 in)	20 years	49 of 100 (Notable)
23 May 1966	Wahoo, US	daily rain	80.0 mm (3.1 in)	45.5 mm (1.8 in)	12 years	48 of 100 (Notable)
23 May 1966	Saidapet, IN	daily rain	50.0 mm (2.0 in)	50.0 mm (2.0 in)	64 years	38 of 100 (Notable)
23 May 1966	Primghar, US	daily rain	32.5 mm (1.3 in)	14.0 mm (0.6 in)	63 years	38 of 100 (Notable)
23 May 1966	Worthington, US	daily rain	35.6 mm (1.4 in)	14.0 mm (0.6 in)	63 years	38 of 100 (Notable)
23 May 1966	Kendall, US	monthly low min	-16.7 C (1.9 F)	2.8 C (5.0 F)	49 years	38 of 100 (Notable)
23 May 1966	Audubon, US	daily rain	34.8 mm (1.4 in)	16.3 mm (0.6 in)	59 years	37 of 100 (Notable)
23 May 1966	Garden Valley, US	monthly low min	-7.8 C (18.0 F)	2.2 C (4.0 F)	44 years	36 of 100 (Notable)
23 May 1966	Recanto, BR	daily rain	47.7 mm (1.9 in)	31.1 mm (1.2 in)	31 years	35 of 100 (Notable)
23 May 1966	Ottawa 4SW, US	daily rain	33.5 mm (1.3 in)	11.4 mm (0.4 in)	59 years	35 of 100 (Notable)
23 May 1966	Cresco 1 NE, US	daily rain	36.6 mm (1.4 in)	11.2 mm (0.4 in)	61 years	35 of 100 (Notable)
23 May 1966	Humboldt 3 W, US	daily rain	42.7 mm (1.7 in)	16.3 mm (0.6 in)	52 years	35 of 100 (Notable)
23 May 1966	Waukesha Wwtp, US	daily rain	33.5 mm (1.3 in)	8.9 mm (0.35 in)	64 years	35 of 100 (Notable)
23 May 1966	Bedford 2 SE, US	daily low min	-7.8 C (18.0 F)	3.9 C (7.0 F)	57 years	35 of 100 (Notable)
23 May 1966	Brownwood 2NE, US	daily high min	23.9 C (75.0 F)	2.8 C (5.0 F)	69 years	34 of 100 (Routine)
23 May 1966	Border 3 N, US	daily low min	-9.4 C (15.1 F)	3.3 C (5.9 F)	64 years	34 of 100 (Routine)
23 May 1966	Usina Avanhandava (Cpfl), BR	daily rain	38.7 mm (1.5 in)	31.4 mm (1.2 in)	12 years	33 of 100 (Routine)
23 May 1966	Blackfoot Dam, US	monthly low min	-13.3 C (8.1 F)	2.2 C (4.0 F)	46 years	33 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 1966

Records set or tied on this calendar date in each year from 1793 to 1966. 1966 had 391 records.

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

Records on 05-23 in each year
Year	Records
1793	1
1794	1
1798	1
1817	1
1818	1
1837	3
1845	1
1847	2
1857	1
1863	1
1865	2
1866	5
1867	7
1870	2
1871	1
1875	1
1877	1
1878	1
1880	1
1884	2
1885	2
1886	4
1887	1
1889	2
1891	11
1893	3
1894	1
1895	3
1896	4
1897	3
1898	8
1899	3
1900	12
1901	3
1902	12
1903	6
1904	14
1905	10
1906	23
1907	11
1908	13
1909	23
1910	26
1911	39
1912	31
1913	29
1914	33
1915	13
1916	44
1917	58
1918	36
1919	120
1920	37
1921	92
1922	82
1923	99
1924	230
1925	325
1926	204
1927	243
1928	177
1929	221
1930	199
1931	719
1932	358
1933	443
1934	203
1935	369
1936	568
1937	156
1938	390
1939	415
1940	324
1941	676
1942	235
1943	342
1944	784
1945	241
1946	311
1947	285
1948	273
1949	612
1950	490
1951	400
1952	597
1953	777
1954	496
1955	650
1956	498
1957	653
1958	744
1959	486
1960	395
1961	412
1962	677
1963	1,153
1964	964
1965	477
1966	391
1967	1,055
1968	578
1969	437
1970	314
1971	659
1972	449
1973	371
1974	678
1975	855
1976	556
1977	596
1978	703
1979	730
1980	1,202
1981	862
1982	717
1983	1,123
1984	1,027
1985	608
1986	626
1987	745
1988	662
1989	1,106
1990	1,660
1991	1,244
1992	1,423
1993	845
1994	690
1995	1,106
1996	1,114
1997	983
1998	947
1999	705
2000	1,372
2001	1,441
2002	1,537
2003	954
2004	1,275
2005	908
2006	1,122
2007	1,170
2008	1,472
2009	805
2010	1,275
2011	1,001
2012	1,006
2013	929
2014	858
2015	667
2016	679
2017	602
2018	552
2019	1,044
2020	631
2021	837
2022	807
2023	316
2024	760
2025	865
2026	804

Download the Data

Data for records on 1966-05-23: 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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-16. Last revised 16 October 2026 (2026-10-16).

Margin	Records
0 to 20	286
20 to 40	8
40 to 60	2
60 to 80	0
80 to 100	1