Weather Records on 21 August 2017

347 weather records were set or tied worldwide on 21 August 2017. Highest significance: Spirit Lake, US.

Key Facts for 21 August 2017

On 21 August 2017, 347 weather records were set or tied at long-record stations worldwide.
185 were record highs and 65 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 7 monthly and 339 daily.
Spirit Lake set a daily record precipitation of 127.0 mm (5.0 in) on 21 August 2017.
Across 165 earlier years (1800 to 2026) the same calendar date averaged 451 records.

Record Map

347 stations

347 station records on 21 August 2017 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 August 2017: highest significance records shown on the map
Station	Country	Type	Value	Significance
Spirit Lake	United States	Record daily precipitation	127.0 mm (5.0 in)	80 of 100 (Exceptional)
Guthrie Ctr	United States	Record daily precipitation	123.2 mm (4.9 in)	71 of 100 (Major)
Erofej Pavlovic	Russia	Record daily precipitation	73.9 mm (2.9 in)	69 of 100 (Major)
Audubon	United States	Record daily precipitation	137.7 mm (5.4 in)	68 of 100 (Major)
Kilauea 1134	United States	Record daily precipitation	66.8 mm (2.6 in)	68 of 100 (Major)
Lawrence	United States	Record daily precipitation	119.4 mm (4.7 in)	67 of 100 (Major)
Denison	United States	Record daily precipitation	164.3 mm (6.5 in)	65 of 100 (Major)
Topeka ASOS	United States	Record daily precipitation	97.3 mm (3.8 in)	60 of 100 (Major)
Estherville 4E	United States	Record daily precipitation	61.0 mm (2.4 in)	54 of 100 (Notable)
Atlantic 1 NE	United States	Record daily precipitation	75.9 mm (3.0 in)	53 of 100 (Notable)
Murdo	United States	Record daily precipitation	46.2 mm (1.8 in)	53 of 100 (Notable)
Kansas City Intl AP	United States	Record daily precipitation	103.6 mm (4.1 in)	53 of 100 (Notable)
Moose Creek	United States	Record daily precipitation	27.9 mm (1.1 in)	50 of 100 (Notable)
Topeka Forbes Fld	United States	Record daily precipitation	66.3 mm (2.6 in)	50 of 100 (Notable)
Pierre Rgnl AP	United States	Record daily precipitation	34.3 mm (1.4 in)	50 of 100 (Notable)
Savukoski Kk	Finland	Record daily precipitation	35.6 mm (1.4 in)	48 of 100 (Notable)
Mt Locke	United States	Record daily precipitation	56.1 mm (2.2 in)	48 of 100 (Notable)
Sioux Ctr 2 SE	United States	Record daily precipitation	58.7 mm (2.3 in)	46 of 100 (Notable)
Cleve	Australia	Record low minimum temperature	-1.5 C (29.3 F)	45 of 100 (Notable)
Magdagaci	Russia	Record daily precipitation	67.1 mm (2.6 in)	45 of 100 (Notable)
Mapleton No.2	United States	Record daily precipitation	74.7 mm (2.9 in)	44 of 100 (Notable)
Springhill	United States	Record daily precipitation	101.6 mm (4.0 in)	43 of 100 (Notable)
Massena	United States	Record daily precipitation	87.1 mm (3.4 in)	42 of 100 (Notable)
Breckenridge	United States	Record low minimum temperature	11.7 C (53.1 F)	42 of 100 (Notable)
Kirley 7 N	United States	Record daily precipitation	59.2 mm (2.3 in)	41 of 100 (Notable)
Ben Gurion	Israel	Record low minimum temperature	15.0 C (59.0 F)	40 of 100 (Notable)
Olathe Johnson Co Ind AP	United States	Record daily precipitation	80.3 mm (3.2 in)	40 of 100 (Notable)
Superior	United States	Record daily precipitation	26.4 mm (1.0 in)	39 of 100 (Notable)
Milford 4 NW	United States	Record daily precipitation	78.5 mm (3.1 in)	38 of 100 (Notable)
Shenandoah	United States	Record daily precipitation	42.2 mm (1.7 in)	38 of 100 (Notable)
Kirksville Rgnl AP	United States	Record daily precipitation	81.3 mm (3.2 in)	37 of 100 (Notable)
Poona	India	Record low minimum temperature	18.6 C (65.5 F)	36 of 100 (Notable)
Rivne	Ukraine	Record daily precipitation	30.0 mm (1.2 in)	36 of 100 (Notable)
Troickij Priisk	Russia	Record low maximum temperature	7.9 C (46.2 F)	35 of 100 (Notable)
A Coruna	Spain	Record high maximum temperature	33.2 C (91.8 F)	35 of 100 (Notable)
Quincy	United States	Record high minimum temperature	22.2 C (72.0 F)	34 of 100 (Routine)
Melnichnoe	Russia	Record high maximum temperature	31.9 C (89.4 F)	33 of 100 (Routine)
Monroe Rgnl AP	United States	Record daily precipitation	33.0 mm (1.3 in)	33 of 100 (Routine)
Bagdarin	Russia	Record daily precipitation	30.0 mm (1.2 in)	32 of 100 (Routine)
Rye Patch Dam	United States	Record high minimum temperature	18.3 C (64.9 F)	32 of 100 (Routine)
Vega 2NW	United States	Record daily precipitation	28.4 mm (1.1 in)	32 of 100 (Routine)
Mtn View	United States	Record low maximum temperature	16.1 C (61.0 F)	32 of 100 (Routine)
Half Moon Bay	United States	Record high minimum temperature	16.1 C (61.0 F)	31 of 100 (Routine)
Kotlas	Russia	Record high maximum temperature	28.2 C (82.8 F)	30 of 100 (Routine)
Holm	Russia	Record high minimum temperature	16.1 C (61.0 F)	30 of 100 (Routine)
Natural Brg	United States	Record low minimum temperature	10.6 C (51.1 F)	30 of 100 (Routine)
Holstein	United States	Record daily precipitation	81.8 mm (3.2 in)	30 of 100 (Routine)
Stockton Dam	United States	Record daily precipitation	63.8 mm (2.5 in)	30 of 100 (Routine)
State UNIV	United States	Record low maximum temperature	25.0 C (77.0 F)	29 of 100 (Routine)
Watford City 14S	United States	Record low minimum temperature	3.3 C (37.9 F)	29 of 100 (Routine)
Princeville Rch 1117	United States	Record daily precipitation	33.0 mm (1.3 in)	29 of 100 (Routine)
Terre Haute Indiana State	United States	Record high minimum temperature	27.2 C (81.0 F)	28 of 100 (Routine)
Mystic Lake	United States	Record low maximum temperature	11.7 C (53.1 F)	28 of 100 (Routine)
Los Lunas 3 SSW	United States	Record low maximum temperature	25.0 C (77.0 F)	28 of 100 (Routine)
Escalante	United States	Record high minimum temperature	16.7 C (62.1 F)	28 of 100 (Routine)
Moloaa 1145	United States	Record daily precipitation	29.5 mm (1.2 in)	28 of 100 (Routine)
Verhnjaja Tojma	Russia	Record high minimum temperature	17.5 C (63.5 F)	27 of 100 (Routine)
Kara-Tjurek	Russia	Record low minimum temperature	-3.7 C (25.3 F)	27 of 100 (Routine)
Krasnaja Poljana	Russia	Record high maximum temperature	33.0 C (91.4 F)	27 of 100 (Routine)
Dhahran	Saudi Arabia	Record high minimum temperature	33.0 C (91.4 F)	27 of 100 (Routine)

Counts by Type and Timescale

347 records

Records set or tied on 21 August 2017 by type: Highest daily maximum 76, Lowest daily maximum 33, Highest daily minimum 109, Lowest daily minimum 32, Heaviest daily rainfall 97.

Records on 21 August 2017 by type
Record type	Records
Highest daily maximum	76
Lowest daily maximum	33
Highest daily minimum	109
Lowest daily minimum	32
Heaviest daily rainfall	97
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 21 August 2017 by timescale: all-time 1, monthly 7, daily 339.

How Much Records Were Beaten By

271 broken records

Margins by which the 271 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 108.9. Ties are not counted.

Top 20 by Significance

21 August 2017

Top 20 records on 21 August 2017 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 August 2017	Spirit Lake, US	daily rain	127.0 mm (5.0 in)	75.4 mm (3.0 in)	120 years	80 of 100 (Exceptional)
21 August 2017	Guthrie Ctr, US	daily rain	123.2 mm (4.9 in)	81.0 mm (3.2 in)	71 years	71 of 100 (Major)
21 August 2017	Erofej Pavlovic, RU	daily rain	73.9 mm (2.9 in)	58.8 mm (2.3 in)	70 years	69 of 100 (Major)
21 August 2017	Audubon, US	daily rain	137.7 mm (5.4 in)	59.0 mm (2.3 in)	71 years	68 of 100 (Major)
21 August 2017	Kilauea 1134, US	daily rain	66.8 mm (2.6 in)	39.1 mm (1.5 in)	63 years	68 of 100 (Major)
21 August 2017	Lawrence, US	daily rain	119.4 mm (4.7 in)	52.1 mm (2.1 in)	92 years	67 of 100 (Major)
21 August 2017	Denison, US	daily rain	164.3 mm (6.5 in)	108.9 mm (4.3 in)	52 years	65 of 100 (Major)
21 August 2017	Topeka ASOS, US	daily rain	97.3 mm (3.8 in)	63.5 mm (2.5 in)	63 years	60 of 100 (Major)
21 August 2017	Estherville 4E, US	daily rain	61.0 mm (2.4 in)	22.9 mm (0.9 in)	94 years	54 of 100 (Notable)
21 August 2017	Atlantic 1 NE, US	daily rain	75.9 mm (3.0 in)	45.2 mm (1.8 in)	51 years	53 of 100 (Notable)
21 August 2017	Murdo, US	daily rain	46.2 mm (1.8 in)	14.4 mm (0.6 in)	100 years	53 of 100 (Notable)
21 August 2017	Kansas City Intl AP, US	daily rain	103.6 mm (4.1 in)	93.4 mm (3.7 in)	32 years	53 of 100 (Notable)
21 August 2017	Moose Creek, US	daily rain	27.9 mm (1.1 in)	17.7 mm (0.7 in)	31 years	50 of 100 (Notable)
21 August 2017	Topeka Forbes Fld, US	daily rain	66.3 mm (2.6 in)	45.7 mm (1.8 in)	56 years	50 of 100 (Notable)
21 August 2017	Pierre Rgnl AP, US	daily rain	34.3 mm (1.4 in)	10.4 mm (0.4 in)	111 years	50 of 100 (Notable)
21 August 2017	Savukoski Kk, FI	daily rain	35.6 mm (1.4 in)	18.8 mm (0.7 in)	38 years	48 of 100 (Notable)
21 August 2017	Mt Locke, US	daily rain	56.1 mm (2.2 in)	28.2 mm (1.1 in)	43 years	48 of 100 (Notable)
21 August 2017	Sioux Ctr 2 SE, US	daily rain	58.7 mm (2.3 in)	9.2 mm (0.36 in)	111 years	46 of 100 (Notable)
21 August 2017	Cleve, AU	all-time low min	-1.5 C (29.3 F)	1.7 C (3.1 F)	45 years	45 of 100 (Notable)
21 August 2017	Magdagaci, RU	daily rain	67.1 mm (2.6 in)	31.5 mm (1.2 in)	59 years	45 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

1800 to 2017

Records set or tied on this calendar date in each year from 1800 to 2017. 2017 had 347 records.

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

Records on 08-21 in each year
Year	Records
1800	1
1802	1
1804	1
1807	1
1816	1
1818	1
1832	1
1834	1
1839	3
1843	1
1847	1
1849	3
1850	1
1851	2
1863	1
1866	1
1867	2
1870	3
1871	2
1872	1
1873	1
1876	1
1877	2
1879	2
1884	2
1885	5
1886	1
1887	5
1888	2
1889	3
1890	4
1891	2
1893	4
1894	8
1895	3
1896	2
1897	4
1898	4
1899	7
1900	4
1901	9
1902	8
1903	6
1904	8
1905	4
1906	22
1907	20
1908	13
1909	17
1910	33
1911	19
1912	50
1913	37
1914	24
1915	21
1916	106
1917	101
1918	202
1919	19
1920	59
1921	34
1922	58
1923	111
1924	135
1925	220
1926	227
1927	228
1928	110
1929	234
1930	297
1931	277
1932	264
1933	328
1934	320
1935	318
1936	807
1937	762
1938	239
1939	630
1940	683
1941	180
1942	415
1943	438
1944	346
1945	544
1946	390
1947	954
1948	305
1949	508
1950	958
1951	699
1952	368
1953	331
1954	497
1955	885
1956	701
1957	490
1958	389
1959	704
1960	490
1961	644
1962	469
1963	338
1964	794
1965	455
1966	661
1967	541
1968	1,014
1969	650
1970	373
1971	660
1972	441
1973	438
1974	564
1975	545
1976	756
1977	764
1978	445
1979	778
1980	904
1981	1,015
1982	769
1983	1,407
1984	975
1985	623
1986	1,166
1987	740
1988	889
1989	828
1990	910
1991	828
1992	957
1993	698
1994	968
1995	962
1996	950
1997	1,291
1998	948
1999	717
2000	861
2001	797
2002	965
2003	1,241
2004	1,585
2005	1,071
2006	797
2007	1,829
2008	1,012
2009	1,319
2010	1,155
2011	1,022
2012	990
2013	513
2014	624
2015	651
2016	890
2017	347
2018	816
2019	631
2020	1,147
2021	767
2022	917
2023	1,826
2024	777
2025	1,230
2026	1,290

Download the Data

Data for records on 2017-08-21: 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-13. Last revised 13 October 2026 (2026-10-13).

Margin	Records
0 to 20	248
20 to 40	10
40 to 60	7
60 to 80	3
80 to 100	2
100 to 120	1