Weather Records on 30 July 2021

839 weather records were set or tied worldwide on 30 July 2021. Highest significance: Calcutta/Alipore, IN.

Key Facts for 30 July 2021

On 30 July 2021, 839 weather records were set or tied at long-record stations worldwide.
558 were record highs and 83 were record lows, counting maximum and minimum temperature.
By timescale, 3 were all-time records, 39 monthly and 797 daily.
Calcutta/Alipore set a daily record precipitation of 150.1 mm (5.9 in) on 30 July 2021.
Across 168 earlier years (1794 to 2026) the same calendar date averaged 438 records.

Record Map

839 stations

839 station records on 30 July 2021 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 30 July 2021: highest significance records shown on the map
Station	Country	Type	Value	Significance
Calcutta/Alipore	India	Record daily precipitation	150.1 mm (5.9 in)	70 of 100 (Major)
Idaho Falls 16 SE	United States	Record daily precipitation	46.5 mm (1.8 in)	67 of 100 (Major)
Kyra	Russia	Record daily precipitation	67.1 mm (2.6 in)	63 of 100 (Major)
Graz	Austria	Record daily precipitation	113.3 mm (4.5 in)	61 of 100 (Major)
Waverly	United States	Record daily precipitation	70.1 mm (2.8 in)	59 of 100 (Notable)
Ekimchan	Russia	Record daily precipitation	49.0 mm (1.9 in)	58 of 100 (Notable)
Piketon	United States	Record daily precipitation	68.6 mm (2.7 in)	57 of 100 (Notable)
Hissar	India	Record daily precipitation	117.1 mm (4.6 in)	54 of 100 (Notable)
Marysville	United States	Record daily precipitation	33.0 mm (1.3 in)	53 of 100 (Notable)
Hudson 1 SSE	United States	Record daily precipitation	52.6 mm (2.1 in)	52 of 100 (Notable)
Dull Ctr 1SE	United States	Record daily precipitation	53.3 mm (2.1 in)	52 of 100 (Notable)
Eastman 1 W	United States	Record high minimum temperature	26.1 C (79.0 F)	50 of 100 (Notable)
Cave Run Lake	United States	Record daily precipitation	116.3 mm (4.6 in)	50 of 100 (Notable)
Portsmouth-Sciotoville	United States	Record daily precipitation	48.0 mm (1.9 in)	50 of 100 (Notable)
Boonville 4 SSW	United States	Record daily precipitation	71.1 mm (2.8 in)	49 of 100 (Notable)
Clear Creek #1	United States	Record daily precipitation	35.6 mm (1.4 in)	48 of 100 (Notable)
Castle Rock	United States	Record high minimum temperature	19.4 C (66.9 F)	47 of 100 (Notable)
Waynesburg 1 E	United States	Record daily precipitation	46.7 mm (1.8 in)	47 of 100 (Notable)
Casper Mtn.	United States	Record daily precipitation	48.3 mm (1.9 in)	47 of 100 (Notable)
Huili	China	Record daily precipitation	128.0 mm (5.0 in)	46 of 100 (Notable)
Craig	United States	Record high minimum temperature	15.0 C (59.0 F)	46 of 100 (Notable)
Clear Creek #2	United States	Record daily precipitation	40.6 mm (1.6 in)	46 of 100 (Notable)
Markovo	Russia	Record low maximum temperature	7.6 C (45.7 F)	45 of 100 (Notable)
Moscow U of I	United States	Record high maximum temperature	40.0 C (104.0 F)	43 of 100 (Notable)
Morgan	United States	Record daily precipitation	28.2 mm (1.1 in)	43 of 100 (Notable)
Vladivostok	Russia	Record high minimum temperature	24.3 C (75.7 F)	42 of 100 (Notable)
Ogallala	United States	Record high minimum temperature	21.7 C (71.1 F)	42 of 100 (Notable)
Hightstown 2 W	United States	Record daily precipitation	121.9 mm (4.8 in)	42 of 100 (Notable)
Trenton Falls	United States	Record daily precipitation	50.5 mm (2.0 in)	42 of 100 (Notable)
Saint Ignatius	United States	Record low minimum temperature	2.2 C (36.0 F)	41 of 100 (Notable)
Trout Creek	United States	Record daily precipitation	30.5 mm (1.2 in)	41 of 100 (Notable)
Mae Sot	Thailand	Record daily precipitation	113.8 mm (4.5 in)	40 of 100 (Notable)
Lakeport 2	United States	Record daily precipitation	78.7 mm (3.1 in)	40 of 100 (Notable)
Morgan	United States	Record high minimum temperature	17.8 C (64.0 F)	40 of 100 (Notable)
Morgantown L&D	United States	Record daily precipitation	50.8 mm (2.0 in)	40 of 100 (Notable)
Heinola Asemantaus	Finland	Record daily precipitation	30.4 mm (1.2 in)	39 of 100 (Notable)
Varfu Omul	Romania	Record daily precipitation	42.9 mm (1.7 in)	39 of 100 (Notable)
Keene	United States	Record daily precipitation	85.1 mm (3.4 in)	39 of 100 (Notable)
Gouverneur 3 NW	United States	Record low maximum temperature	16.7 C (62.1 F)	39 of 100 (Notable)
Lacrosse	United States	Record high maximum temperature	41.7 C (107.1 F)	39 of 100 (Notable)
Worland	United States	Record high minimum temperature	18.9 C (66.0 F)	39 of 100 (Notable)
Crab Orchard 6 N	United States	Record daily precipitation	57.2 mm (2.3 in)	38 of 100 (Notable)
Wamsutter	United States	Record high minimum temperature	16.7 C (62.1 F)	38 of 100 (Notable)
Lamoille #3	United States	Record daily precipitation	35.6 mm (1.4 in)	38 of 100 (Notable)
Spokane Intl AP	United States	Record high minimum temperature	20.6 C (69.1 F)	38 of 100 (Notable)
Hayden	United States	Record high minimum temperature	17.8 C (64.0 F)	37 of 100 (Notable)
Buckhorn Lake	United States	Record daily precipitation	42.4 mm (1.7 in)	37 of 100 (Notable)
Greenup Locks & Dam	United States	Record daily precipitation	56.1 mm (2.2 in)	37 of 100 (Notable)
Hillsboro	United States	Record daily precipitation	63.5 mm (2.5 in)	37 of 100 (Notable)
Deaver	United States	Record high minimum temperature	20.0 C (68.0 F)	37 of 100 (Notable)
Dollarhide Summit	United States	Record daily precipitation	40.6 mm (1.6 in)	37 of 100 (Notable)
Iquitos	Peru	Record low maximum temperature	27.5 C (81.5 F)	36 of 100 (Notable)
Clay City 1 WNW	United States	Record daily precipitation	81.3 mm (3.2 in)	36 of 100 (Notable)
Lakeside	United States	Record high minimum temperature	25.6 C (78.1 F)	36 of 100 (Notable)
Pulaski	United States	Record daily precipitation	32.3 mm (1.3 in)	36 of 100 (Notable)
Ridgway	United States	Record daily precipitation	35.3 mm (1.4 in)	36 of 100 (Notable)
Woodruff	United States	Record high minimum temperature	14.4 C (57.9 F)	36 of 100 (Notable)
Gustavus	United States	Record low minimum temperature	3.3 C (37.9 F)	36 of 100 (Notable)
The Poplars	United States	Record high minimum temperature	17.2 C (63.0 F)	35 of 100 (Notable)
Columbia UNIV of Sc	United States	Record high minimum temperature	26.1 C (79.0 F)	35 of 100 (Notable)

Counts by Type and Timescale

839 records

Records set or tied on 30 July 2021 by type: Highest daily maximum 166, Lowest daily maximum 37, Highest daily minimum 392, Lowest daily minimum 46, Heaviest daily rainfall 198.

Records on 30 July 2021 by type
Record type	Records
Highest daily maximum	166
Lowest daily maximum	37
Highest daily minimum	392
Lowest daily minimum	46
Heaviest daily rainfall	198
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 30 July 2021 by timescale: all-time 3, monthly 39, daily 797.

How Much Records Were Beaten By

629 broken records

Margins by which the 629 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 75.4. Ties are not counted.

Top 20 by Significance

30 July 2021

Top 20 records on 30 July 2021 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 July 2021	Calcutta/Alipore, IN	daily rain	150.1 mm (5.9 in)	75.4 mm (3.0 in)	82 years	70 of 100 (Major)
30 July 2021	Idaho Falls 16 SE, US	monthly rain	46.5 mm (1.8 in)	20.1 mm (0.8 in)	37 years	67 of 100 (Major)
30 July 2021	Kyra, RU	daily rain	67.1 mm (2.6 in)	30.4 mm (1.2 in)	80 years	63 of 100 (Major)
30 July 2021	Graz, AT	all-time rain	113.3 mm (4.5 in)	8.3 mm (0.33 in)	83 years	61 of 100 (Major)
30 July 2021	Waverly, US	daily rain	70.1 mm (2.8 in)	47.7 mm (1.9 in)	31 years	59 of 100 (Notable)
30 July 2021	Ekimchan, RU	daily rain	49.0 mm (1.9 in)	21.8 mm (0.9 in)	106 years	58 of 100 (Notable)
30 July 2021	Piketon, US	daily rain	68.6 mm (2.7 in)	50.3 mm (2.0 in)	30 years	57 of 100 (Notable)
30 July 2021	Hissar, IN	daily rain	117.1 mm (4.6 in)	57.2 mm (2.3 in)	44 years	54 of 100 (Notable)
30 July 2021	Marysville, US	daily rain	33.0 mm (1.3 in)	17.3 mm (0.7 in)	96 years	53 of 100 (Notable)
30 July 2021	Hudson 1 SSE, US	daily rain	52.6 mm (2.1 in)	38.9 mm (1.5 in)	35 years	52 of 100 (Notable)
30 July 2021	Dull Ctr 1SE, US	daily rain	53.3 mm (2.1 in)	23.8 mm (0.9 in)	63 years	52 of 100 (Notable)
30 July 2021	Eastman 1 W, US	daily high min	26.1 C (79.0 F)	1.7 C (3.1 F)	111 years	50 of 100 (Notable)
30 July 2021	Cave Run Lake, US	monthly rain	116.3 mm (4.6 in)	19.8 mm (0.8 in)	56 years	50 of 100 (Notable)
30 July 2021	Portsmouth-Sciotoville, US	daily rain	48.0 mm (1.9 in)	13.7 mm (0.5 in)	120 years	50 of 100 (Notable)
30 July 2021	Boonville 4 SSW, US	daily rain	71.1 mm (2.8 in)	35.0 mm (1.4 in)	44 years	49 of 100 (Notable)
30 July 2021	Clear Creek #1, US	daily rain	35.6 mm (1.4 in)	25.4 mm (1.0 in)	15 years	48 of 100 (Notable)
30 July 2021	Castle Rock, US	daily high min	19.4 C (66.9 F)	2.2 C (4.0 F)	96 years	47 of 100 (Notable)
30 July 2021	Waynesburg 1 E, US	daily rain	46.7 mm (1.8 in)	25.6 mm (1.0 in)	58 years	47 of 100 (Notable)
30 July 2021	Casper Mtn., US	monthly rain	48.3 mm (1.9 in)	12.7 mm (0.5 in)	32 years	47 of 100 (Notable)
30 July 2021	Huili, CN	daily rain	128.0 mm (5.0 in)	61.6 mm (2.4 in)	20 years	46 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

1794 to 2021

Records set or tied on this calendar date in each year from 1794 to 2021. 2021 had 839 records.

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

Records on 07-30 in each year
Year	Records
1794	2
1797	1
1827	1
1828	2
1829	1
1830	1
1834	1
1837	2
1838	1
1840	1
1841	1
1843	1
1854	1
1857	1
1858	2
1860	4
1863	1
1867	1
1868	1
1869	2
1870	1
1874	2
1875	1
1876	1
1877	2
1879	1
1880	2
1885	3
1886	5
1887	6
1888	5
1889	1
1890	2
1891	1
1892	1
1893	10
1894	6
1895	2
1896	2
1897	4
1898	8
1899	2
1900	4
1901	11
1902	6
1903	25
1904	17
1905	29
1906	22
1907	11
1908	23
1909	30
1910	8
1911	54
1912	21
1913	34
1914	52
1915	26
1916	150
1917	93
1918	42
1919	19
1920	188
1921	193
1922	40
1923	428
1924	80
1925	275
1926	186
1927	109
1928	210
1929	221
1930	170
1931	432
1932	275
1933	451
1934	619
1935	340
1936	452
1937	245
1938	388
1939	395
1940	562
1941	371
1942	304
1943	397
1944	289
1945	299
1946	409
1947	394
1948	489
1949	512
1950	552
1951	322
1952	581
1953	345
1954	504
1955	787
1956	506
1957	289
1958	344
1959	391
1960	793
1961	511
1962	378
1963	308
1964	483
1965	978
1966	527
1967	282
1968	530
1969	506
1970	431
1971	2,319
1972	758
1973	434
1974	569
1975	1,048
1976	590
1977	641
1978	646
1979	761
1980	962
1981	851
1982	821
1983	904
1984	997
1985	1,029
1986	952
1987	1,084
1988	826
1989	1,227
1990	795
1991	734
1992	1,003
1993	965
1994	1,631
1995	1,207
1996	1,317
1997	933
1998	1,240
1999	1,456
2000	1,030
2001	1,400
2002	1,346
2003	1,163
2004	936
2005	788
2006	1,103
2007	1,160
2008	763
2009	1,328
2010	1,331
2011	1,003
2012	731
2013	737
2014	1,199
2015	682
2016	460
2017	464
2018	1,038
2019	486
2020	763
2021	839
2022	845
2023	683
2024	705
2025	869
2026	1,001

Download the Data

Data for records on 2021-07-30: 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	569
10 to 20	30
20 to 30	18
30 to 40	6
40 to 50	2
50 to 60	2
60 to 70	1
70 to 80	1