Weather Records on 17 August 1991

560 weather records were set or tied worldwide on 17 August 1991. Highest significance: Maceio (Aeroporto), BR.

Key Facts for 17 August 1991

On 17 August 1991, 560 weather records were set or tied at long-record stations worldwide.
273 were record highs and 99 were record lows, counting maximum and minimum temperature.
By timescale, 4 were all-time records, 13 monthly and 543 daily.
Maceio (Aeroporto) set a daily record precipitation of 79.0 mm (3.1 in) on 17 August 1991.
Across 162 earlier years (1797 to 2026) the same calendar date averaged 473 records.

Record Map

560 stations

560 station records on 17 August 1991 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 August 1991: highest significance records shown on the map
Station	Country	Type	Value	Significance
Maceio (Aeroporto)	Brazil	Record daily precipitation	79.0 mm (3.1 in)	61 of 100 (Major)
Ft Bayard 4W	United States	Record daily precipitation	44.2 mm (1.7 in)	51 of 100 (Notable)
Johvi	Estonia	Record daily precipitation	40.4 mm (1.6 in)	50 of 100 (Notable)
Bardufoss	Norway	Record daily precipitation	40.2 mm (1.6 in)	50 of 100 (Notable)
Blagodarnyj	Russia	Record daily precipitation	32.9 mm (1.3 in)	48 of 100 (Notable)
Monclova (Dge)	Mexico	Record low maximum temperature	20.6 C (69.1 F)	47 of 100 (Notable)
Deputatskij	Russia	Record daily precipitation	40.4 mm (1.6 in)	47 of 100 (Notable)
Peon Blanco	Mexico	Record daily precipitation	44.5 mm (1.8 in)	46 of 100 (Notable)
Cordova AP	United States	Record daily precipitation	108.7 mm (4.3 in)	44 of 100 (Notable)
Pratt 3NW	United States	Record daily precipitation	41.9 mm (1.6 in)	43 of 100 (Notable)
Saginaw Mbs Intl AP	United States	Record daily precipitation	47.5 mm (1.9 in)	43 of 100 (Notable)
Ljungby	Sweden	Record daily precipitation	25.7 mm (1.0 in)	42 of 100 (Notable)
Anchorage Ted Stevens Intl AP	United States	Record daily precipitation	33.0 mm (1.3 in)	42 of 100 (Notable)
Gluckstadt	Germany	Record daily precipitation	32.8 mm (1.3 in)	41 of 100 (Notable)
Beaver Dam	United States	Record daily precipitation	50.8 mm (2.0 in)	40 of 100 (Notable)
Arlington	United States	Record high minimum temperature	23.3 C (73.9 F)	40 of 100 (Notable)
Penedo	Brazil	Record daily precipitation	59.9 mm (2.4 in)	39 of 100 (Notable)
Wrixum/Fohr	Germany	Record daily precipitation	50.1 mm (2.0 in)	39 of 100 (Notable)
Camargo (Smn)	Mexico	Record daily precipitation	33.8 mm (1.3 in)	39 of 100 (Notable)
Flagstaff AP	United States	Record high maximum temperature	30.6 C (87.1 F)	38 of 100 (Notable)
Wichita Falls Muni AP	United States	Record low minimum temperature	15.0 C (59.0 F)	38 of 100 (Notable)
Newton	United States	Record daily precipitation	57.9 mm (2.3 in)	37 of 100 (Notable)
Nenastnaja	Russia	Record daily precipitation	28.7 mm (1.1 in)	36 of 100 (Notable)
Lac Vieux Desert	United States	Record daily precipitation	31.0 mm (1.2 in)	36 of 100 (Notable)
Winter	United States	Record daily precipitation	41.9 mm (1.6 in)	36 of 100 (Notable)
San Lucas Ojitlan	Mexico	Record low minimum temperature	17.8 C (64.0 F)	35 of 100 (Notable)
Sedgwick	United States	Record daily precipitation	35.6 mm (1.4 in)	35 of 100 (Notable)
Throckmorton	United States	Record daily precipitation	59.7 mm (2.4 in)	35 of 100 (Notable)
Markovo	Russia	Record high maximum temperature	25.5 C (77.9 F)	34 of 100 (Routine)
Madrid/Getafe	Spain	Record high minimum temperature	24.4 C (75.9 F)	34 of 100 (Routine)
Mineral-Nye-Vody	Russia	Record daily precipitation	25.7 mm (1.0 in)	33 of 100 (Routine)
Westfield 2 SSE	United States	Record high maximum temperature	32.8 C (91.0 F)	33 of 100 (Routine)
Temascal	Mexico	Record high maximum temperature	37.8 C (100.0 F)	32 of 100 (Routine)
Elk	United States	Record daily precipitation	31.2 mm (1.2 in)	32 of 100 (Routine)
Miahuatlan (Smn)	Mexico	Record high maximum temperature	38.9 C (102.0 F)	31 of 100 (Routine)
Dzitas	Mexico	Record high minimum temperature	26.7 C (80.1 F)	31 of 100 (Routine)
N Vernon 2 ESE	United States	Record daily precipitation	45.5 mm (1.8 in)	31 of 100 (Routine)
Stamford 1	United States	Record daily precipitation	33.3 mm (1.3 in)	31 of 100 (Routine)
Zuni	United States	Record high minimum temperature	22.2 C (72.0 F)	31 of 100 (Routine)
Macuspana (Dge)	Mexico	Record high maximum temperature	38.9 C (102.0 F)	30 of 100 (Routine)
Snowflake	United States	Record high minimum temperature	17.8 C (64.0 F)	30 of 100 (Routine)
Trousdale 1 NE	United States	Record daily precipitation	36.1 mm (1.4 in)	30 of 100 (Routine)
Celaya (Smn)	Mexico	Record daily precipitation	36.3 mm (1.4 in)	29 of 100 (Routine)
Darby	United States	Record high minimum temperature	14.4 C (57.9 F)	29 of 100 (Routine)
Anson	United States	Record daily precipitation	32.5 mm (1.3 in)	29 of 100 (Routine)
Tahoka	United States	Record daily precipitation	25.9 mm (1.0 in)	29 of 100 (Routine)
Palizada	Mexico	Record low maximum temperature	28.9 C (84.0 F)	28 of 100 (Routine)
Tenosique (Smn)	Mexico	Record high maximum temperature	38.3 C (100.9 F)	28 of 100 (Routine)
Chokurdah	Russia	Record high minimum temperature	12.4 C (54.3 F)	28 of 100 (Routine)
Konstantinovka	Russia	Record daily precipitation	41.6 mm (1.6 in)	28 of 100 (Routine)
Frederick	United States	Record daily precipitation	40.6 mm (1.6 in)	28 of 100 (Routine)
Dubbo (Darling Street)	Australia	Record low minimum temperature	-3.4 C (25.9 F)	27 of 100 (Routine)
Neumunster	Germany	Record daily precipitation	28.8 mm (1.1 in)	27 of 100 (Routine)
Jerome	United States	Record daily precipitation	44.5 mm (1.8 in)	27 of 100 (Routine)
Tlaquepaque	Mexico	Record low maximum temperature	21.1 C (70.0 F)	26 of 100 (Routine)
Zapotitlan de Mendez	Mexico	Record low minimum temperature	13.9 C (57.0 F)	26 of 100 (Routine)
Madrid/Barajas	Spain	Record high maximum temperature	41.0 C (105.8 F)	26 of 100 (Routine)
Madras	United States	Record high minimum temperature	18.9 C (66.0 F)	26 of 100 (Routine)
Couderay 7 W	United States	Record daily precipitation	43.7 mm (1.7 in)	26 of 100 (Routine)
Juneau AP	United States	Record high minimum temperature	13.9 C (57.0 F)	26 of 100 (Routine)

Counts by Type and Timescale

560 records

Records set or tied on 17 August 1991 by type: Highest daily maximum 115, Lowest daily maximum 40, Highest daily minimum 158, Lowest daily minimum 59, Heaviest daily rainfall 188.

Records on 17 August 1991 by type
Record type	Records
Highest daily maximum	115
Lowest daily maximum	40
Highest daily minimum	158
Lowest daily minimum	59
Heaviest daily rainfall	188
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 17 August 1991 by timescale: all-time 4, monthly 13, daily 543.

How Much Records Were Beaten By

407 broken records

Margins by which the 407 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 51.5. Ties are not counted.

Top 20 by Significance

17 August 1991

Top 20 records on 17 August 1991 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 August 1991	Maceio (Aeroporto), BR	daily rain	79.0 mm (3.1 in)	51.5 mm (2.0 in)	44 years	61 of 100 (Major)
17 August 1991	Ft Bayard 4W, US	daily rain	44.2 mm (1.7 in)	13.7 mm (0.5 in)	90 years	51 of 100 (Notable)
17 August 1991	Johvi, EE	daily rain	40.4 mm (1.6 in)	24.9 mm (1.0 in)	32 years	50 of 100 (Notable)
17 August 1991	Bardufoss, NO	monthly rain	40.2 mm (1.6 in)	11.5 mm (0.5 in)	20 years	50 of 100 (Notable)
17 August 1991	Blagodarnyj, RU	daily rain	32.9 mm (1.3 in)	27.5 mm (1.1 in)	25 years	48 of 100 (Notable)
17 August 1991	Monclova (Dge), MX	daily low max	20.6 C (69.1 F)	11.1 C (20.0 F)	29 years	47 of 100 (Notable)
17 August 1991	Deputatskij, RU	daily rain	40.4 mm (1.6 in)	26.0 mm (1.0 in)	14 years	47 of 100 (Notable)
17 August 1991	Peon Blanco, MX	daily rain	44.5 mm (1.8 in)	30.5 mm (1.2 in)	22 years	46 of 100 (Notable)
17 August 1991	Cordova AP, US	daily rain	108.7 mm (4.3 in)	42.7 mm (1.7 in)	50 years	44 of 100 (Notable)
17 August 1991	Pratt 3NW, US	daily rain	41.9 mm (1.6 in)	12.7 mm (0.5 in)	84 years	43 of 100 (Notable)
17 August 1991	Saginaw Mbs Intl AP, US	daily rain	47.5 mm (1.9 in)	23.9 mm (0.9 in)	50 years	43 of 100 (Notable)
17 August 1991	Ljungby, SE	daily rain	25.7 mm (1.0 in)	2.4 mm (0.09 in)	99 years	42 of 100 (Notable)
17 August 1991	Anchorage Ted Stevens Intl AP, US	daily rain	33.0 mm (1.3 in)	21.3 mm (0.8 in)	24 years	42 of 100 (Notable)
17 August 1991	Gluckstadt, DE	daily rain	32.8 mm (1.3 in)	11.4 mm (0.4 in)	54 years	41 of 100 (Notable)
17 August 1991	Beaver Dam, US	daily rain	50.8 mm (2.0 in)	15.2 mm (0.6 in)	68 years	40 of 100 (Notable)
17 August 1991	Arlington, US	daily high min	23.3 C (73.9 F)	1.1 C (2.0 F)	93 years	40 of 100 (Notable)
17 August 1991	Penedo, BR	daily rain	59.9 mm (2.4 in)	25.5 mm (1.0 in)	13 years	39 of 100 (Notable)
17 August 1991	Wrixum/Fohr, DE	daily rain	50.1 mm (2.0 in)	14.8 mm (0.6 in)	28 years	39 of 100 (Notable)
17 August 1991	Camargo (Smn), MX	daily rain	33.8 mm (1.3 in)	21.9 mm (0.9 in)	29 years	39 of 100 (Notable)
17 August 1991	Flagstaff AP, US	daily high max	30.6 C (87.1 F)	0.6 C (1.1 F)	92 years	38 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

1797 to 1991

Records set or tied on this calendar date in each year from 1797 to 1991. 1991 had 560 records.

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

Records on 08-17 in each year
Year	Records
1797	2
1802	2
1820	2
1837	1
1838	2
1841	2
1842	1
1845	2
1853	1
1854	1
1856	1
1857	1
1861	3
1862	1
1867	1
1868	3
1869	1
1872	1
1875	2
1876	5
1879	1
1881	1
1882	1
1883	2
1885	3
1886	1
1888	5
1891	1
1892	3
1893	2
1894	3
1895	2
1896	3
1897	1
1898	5
1899	8
1900	3
1901	14
1902	7
1903	6
1904	2
1905	11
1906	28
1907	9
1908	26
1909	24
1910	17
1911	18
1912	31
1913	79
1914	41
1915	28
1916	33
1917	35
1918	112
1919	37
1920	110
1921	37
1922	169
1923	161
1924	171
1925	130
1926	182
1927	228
1928	131
1929	243
1930	138
1931	302
1932	360
1933	260
1934	377
1935	437
1936	670
1937	726
1938	466
1939	364
1940	341
1941	378
1942	461
1943	743
1944	531
1945	387
1946	433
1947	682
1948	475
1949	371
1950	522
1951	413
1952	470
1953	345
1954	685
1955	465
1956	407
1957	504
1958	519
1959	543
1960	533
1961	998
1962	445
1963	650
1964	410
1965	641
1966	496
1967	679
1968	953
1969	593
1970	467
1971	447
1972	1,044
1973	750
1974	582
1975	612
1976	797
1977	1,216
1978	814
1979	1,464
1980	895
1981	1,112
1982	554
1983	1,574
1984	726
1985	948
1986	916
1987	1,150
1988	1,608
1989	687
1990	949
1991	560
1992	1,813
1993	803
1994	1,038
1995	1,724
1996	752
1997	1,544
1998	1,003
1999	697
2000	994
2001	1,101
2002	1,266
2003	948
2004	1,046
2005	722
2006	814
2007	1,646
2008	1,301
2009	922
2010	1,105
2011	956
2012	1,215
2013	802
2014	997
2015	890
2016	748
2017	544
2018	518
2019	467
2020	1,529
2021	800
2022	1,428
2023	1,032
2024	740
2025	538
2026	535

Download the Data

Data for records on 1991-08-17: 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 10	348
10 to 20	40
20 to 30	16
30 to 40	1
40 to 50	1
50 to 60	1