Weather Records on 30 August 1999

864 weather records were set or tied worldwide on 30 August 1999. Highest significance: Gann Valley 4NW, US.

Key Facts for 30 August 1999

On 30 August 1999, 864 weather records were set or tied at long-record stations worldwide.
387 were record highs and 188 were record lows, counting maximum and minimum temperature.
By timescale, 4 were all-time records, 34 monthly and 826 daily.
Gann Valley 4NW set a daily record precipitation of 84.3 mm (3.3 in) on 30 August 1999.
Across 169 earlier years (1806 to 2026) the same calendar date averaged 421 records.

Record Map

864 stations

864 station records on 30 August 1999 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 30 August 1999: highest significance records shown on the map
Station	Country	Type	Value	Significance
Gann Valley 4NW	United States	Record daily precipitation	84.3 mm (3.3 in)	76 of 100 (Major)
Tenosique (Smn)	Mexico	Record daily precipitation	145.3 mm (5.7 in)	69 of 100 (Major)
Morehead City 2 WNW	United States	Record daily precipitation	197.6 mm (7.8 in)	63 of 100 (Major)
Sunnyside - Lund 31S	United States	Record daily precipitation	34.3 mm (1.4 in)	59 of 100 (Notable)
White Lake	United States	Record daily precipitation	88.9 mm (3.5 in)	59 of 100 (Notable)
Byron Bay (Jacaranda Drive)	Australia	Record daily precipitation	62.6 mm (2.5 in)	58 of 100 (Notable)
Wilmington 7 N	United States	Record daily precipitation	143.8 mm (5.7 in)	57 of 100 (Notable)
Nanjing	China	Record daily precipitation	84.3 mm (3.3 in)	56 of 100 (Notable)
Huerta Vieja	Mexico	Record daily precipitation	79.8 mm (3.1 in)	56 of 100 (Notable)
Jayuya	Puerto Rico [United States]	Record daily precipitation	104.1 mm (4.1 in)	56 of 100 (Notable)
Redwood Falls Muni AP	United States	Record daily precipitation	71.1 mm (2.8 in)	56 of 100 (Notable)
Guilin	China	Record daily precipitation	104.8 mm (4.1 in)	55 of 100 (Notable)
Nanchang	China	Record daily precipitation	197.5 mm (7.8 in)	55 of 100 (Notable)
Forestburg 4 NNE	United States	Record daily precipitation	52.8 mm (2.1 in)	55 of 100 (Notable)
Mooloolah Post Office	Australia	Record daily precipitation	28.0 mm (1.1 in)	54 of 100 (Notable)
Murdo	United States	Record daily precipitation	71.4 mm (2.8 in)	54 of 100 (Notable)
Kennebec	United States	Record daily precipitation	94.7 mm (3.7 in)	52 of 100 (Notable)
Mitchell 2 N	United States	Record daily precipitation	40.6 mm (1.6 in)	52 of 100 (Notable)
Wollongbar (Central Park Drive	Australia	Record daily precipitation	51.8 mm (2.0 in)	49 of 100 (Notable)
Deseret	United States	Record high minimum temperature	20.6 C (69.1 F)	49 of 100 (Notable)
Goovigen Post Office	Australia	Record daily precipitation	44.0 mm (1.7 in)	48 of 100 (Notable)
Cedar Is	United States	Record daily precipitation	210.8 mm (8.3 in)	48 of 100 (Notable)
Ballina (Crowley Village)	Australia	Record daily precipitation	62.0 mm (2.4 in)	47 of 100 (Notable)
Presa Taxhimay	Mexico	Record high minimum temperature	18.9 C (66.0 F)	45 of 100 (Notable)
Beerburrum Forest Station	Australia	Record daily precipitation	29.2 mm (1.1 in)	44 of 100 (Notable)
Tezpur	India	Record daily precipitation	103.1 mm (4.1 in)	44 of 100 (Notable)
Saint Bernard	United States	Record high minimum temperature	26.7 C (80.1 F)	44 of 100 (Notable)
Lismore (Centre Street)	Australia	Record daily precipitation	45.6 mm (1.8 in)	43 of 100 (Notable)
Augustine 2E	United States	Record daily precipitation	36.1 mm (1.4 in)	43 of 100 (Notable)
Peachester	Australia	Record daily precipitation	28.0 mm (1.1 in)	42 of 100 (Notable)
Rosebank (Repentance Creek)	Australia	Record daily precipitation	108.0 mm (4.3 in)	41 of 100 (Notable)
Georgetown 2 E	United States	Record low minimum temperature	7.8 C (46.0 F)	41 of 100 (Notable)
Academy 2NE	United States	Record daily precipitation	62.0 mm (2.4 in)	41 of 100 (Notable)
Brushgrove Post Office	Australia	Record daily precipitation	37.7 mm (1.5 in)	40 of 100 (Notable)
Tepexpan	Mexico	Record high maximum temperature	33.9 C (93.0 F)	40 of 100 (Notable)
Ft Pierce	United States	Record high maximum temperature	35.0 C (95.0 F)	40 of 100 (Notable)
Glendive	United States	Record daily precipitation	39.9 mm (1.6 in)	40 of 100 (Notable)
Wessington 2SE	United States	Record daily precipitation	77.0 mm (3.0 in)	40 of 100 (Notable)
Wowan Post Office	Australia	Record daily precipitation	35.0 mm (1.4 in)	39 of 100 (Notable)
Blue Ridge Rs	United States	Record daily precipitation	38.1 mm (1.5 in)	39 of 100 (Notable)
Meerschaumvale (Meerschaum Val	Australia	Record daily precipitation	62.0 mm (2.4 in)	38 of 100 (Notable)
Jingdezhen	China	Record daily precipitation	152.9 mm (6.0 in)	38 of 100 (Notable)
Igsi I Hobol	Norway	Record daily precipitation	57.1 mm (2.2 in)	38 of 100 (Notable)
Partizansk	Russia	Record daily precipitation	87.1 mm (3.4 in)	38 of 100 (Notable)
Vesta	United States	Record daily precipitation	82.6 mm (3.3 in)	38 of 100 (Notable)
Chester	United States	Record high maximum temperature	36.1 C (97.0 F)	38 of 100 (Notable)
Salem 5 SW	United States	Record daily precipitation	52.1 mm (2.1 in)	38 of 100 (Notable)
Galveston	United States	Record high maximum temperature	38.3 C (100.9 F)	38 of 100 (Notable)
Moonmera	Australia	Record daily precipitation	58.4 mm (2.3 in)	37 of 100 (Notable)
Buenavista de Loreto	Mexico	Record daily precipitation	26.9 mm (1.1 in)	37 of 100 (Notable)
Kjusjur	Russia	Record high minimum temperature	12.0 C (53.6 F)	37 of 100 (Notable)
Hetch Hetchy	United States	Record low minimum temperature	-0.6 C (30.9 F)	37 of 100 (Notable)
Fruita	United States	Record high minimum temperature	18.3 C (64.9 F)	37 of 100 (Notable)
Valley Falls	United States	Record low maximum temperature	15.6 C (60.1 F)	37 of 100 (Notable)
Manati 2 E	Puerto Rico [United States]	Record daily precipitation	43.2 mm (1.7 in)	36 of 100 (Notable)
Lake Alfred Exp STN	United States	Record high minimum temperature	25.0 C (77.0 F)	36 of 100 (Notable)
Blowhard Mtn Radar	United States	Record daily precipitation	39.9 mm (1.6 in)	36 of 100 (Notable)
Miami WSO City	United States	Record high maximum temperature	35.6 C (96.1 F)	36 of 100 (Notable)
Wharton Creek Station	Australia	Record daily precipitation	40.0 mm (1.6 in)	35 of 100 (Notable)
Jesup 8 S	United States	Record high minimum temperature	29.4 C (84.9 F)	35 of 100 (Notable)

Counts by Type and Timescale

864 records

Records set or tied on 30 August 1999 by type: Highest daily maximum 209, Lowest daily maximum 107, Highest daily minimum 178, Lowest daily minimum 81, Heaviest daily rainfall 288, Heaviest daily snowfall 1.

Records on 30 August 1999 by type
Record type	Records
Highest daily maximum	209
Lowest daily maximum	107
Highest daily minimum	178
Lowest daily minimum	81
Heaviest daily rainfall	288
Heaviest daily snowfall	1
Deepest snow cover	0

Records on 30 August 1999 by timescale: all-time 4, monthly 34, daily 826.

How Much Records Were Beaten By

626 broken records

Margins by which the 626 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 185.4. Ties are not counted.

Top 20 by Significance

30 August 1999

Top 20 records on 30 August 1999 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 August 1999	Gann Valley 4NW, US	daily rain	84.3 mm (3.3 in)	56.4 mm (2.2 in)	86 years	76 of 100 (Major)
30 August 1999	Tenosique (Smn), MX	daily rain	145.3 mm (5.7 in)	92.5 mm (3.6 in)	76 years	69 of 100 (Major)
30 August 1999	Morehead City 2 WNW, US	monthly rain	197.6 mm (7.8 in)	80.8 mm (3.2 in)	28 years	63 of 100 (Major)
30 August 1999	Sunnyside - Lund 31S, US	daily rain	34.3 mm (1.4 in)	33.5 mm (1.3 in)	32 years	59 of 100 (Notable)
30 August 1999	White Lake, US	daily rain	88.9 mm (3.5 in)	33.0 mm (1.3 in)	86 years	59 of 100 (Notable)
30 August 1999	Byron Bay (Jacaranda Drive), AU	daily rain	62.6 mm (2.5 in)	40.0 mm (1.6 in)	92 years	58 of 100 (Notable)
30 August 1999	Wilmington 7 N, US	daily rain	143.8 mm (5.7 in)	120.9 mm (4.8 in)	40 years	57 of 100 (Notable)
30 August 1999	Nanjing, CN	daily rain	84.3 mm (3.3 in)	68.3 mm (2.7 in)	46 years	56 of 100 (Notable)
30 August 1999	Huerta Vieja, MX	daily rain	79.8 mm (3.1 in)	55.9 mm (2.2 in)	36 years	56 of 100 (Notable)
30 August 1999	Jayuya, PR	daily rain	104.1 mm (4.1 in)	64.2 mm (2.5 in)	44 years	56 of 100 (Notable)
30 August 1999	Redwood Falls Muni AP, US	daily rain	71.1 mm (2.8 in)	20.6 mm (0.8 in)	106 years	56 of 100 (Notable)
30 August 1999	Guilin, CN	daily rain	104.8 mm (4.1 in)	82.7 mm (3.3 in)	36 years	55 of 100 (Notable)
30 August 1999	Nanchang, CN	monthly rain	197.5 mm (7.8 in)	71.0 mm (2.8 in)	6 years	55 of 100 (Notable)
30 August 1999	Forestburg 4 NNE, US	daily rain	52.8 mm (2.1 in)	18.0 mm (0.7 in)	96 years	55 of 100 (Notable)
30 August 1999	Mooloolah Post Office, AU	daily rain	28.0 mm (1.1 in)	20.1 mm (0.8 in)	109 years	54 of 100 (Notable)
30 August 1999	Murdo, US	monthly rain	71.4 mm (2.8 in)	15.5 mm (0.6 in)	68 years	54 of 100 (Notable)
30 August 1999	Kennebec, US	monthly rain	94.7 mm (3.7 in)	16.0 mm (0.6 in)	57 years	52 of 100 (Notable)
30 August 1999	Mitchell 2 N, US	daily rain	40.6 mm (1.6 in)	15.2 mm (0.6 in)	96 years	52 of 100 (Notable)
30 August 1999	Wollongbar (Central Park Drive, AU	daily rain	51.8 mm (2.0 in)	21.3 mm (0.8 in)	92 years	49 of 100 (Notable)
30 August 1999	Deseret, US	daily high min	20.6 C (69.1 F)	5.0 C (9.0 F)	89 years	49 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

1806 to 1999

Records set or tied on this calendar date in each year from 1806 to 1999. 1999 had 864 records.

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

Records on 08-30 in each year
Year	Records
1806	1
1807	4
1813	1
1814	2
1827	1
1829	1
1835	1
1838	1
1839	1
1845	4
1850	1
1851	2
1855	1
1857	1
1859	1
1864	2
1867	1
1869	1
1870	2
1874	1
1875	2
1876	1
1877	2
1878	1
1880	4
1881	2
1882	1
1884	1
1885	5
1886	7
1887	1
1888	1
1889	2
1890	5
1891	1
1892	3
1893	3
1894	2
1895	1
1896	1
1897	3
1898	3
1899	2
1900	6
1901	8
1902	12
1903	19
1904	13
1905	23
1906	29
1907	8
1908	10
1909	37
1910	15
1911	41
1912	60
1913	22
1914	23
1915	47
1916	17
1917	50
1918	45
1919	17
1920	78
1921	100
1922	65
1923	61
1924	283
1925	167
1926	173
1927	109
1928	327
1929	208
1930	245
1931	192
1932	1,102
1933	274
1934	519
1935	476
1936	191
1937	418
1938	233
1939	401
1940	346
1941	422
1942	385
1943	487
1944	491
1945	455
1946	545
1947	599
1948	519
1949	240
1950	481
1951	1,091
1952	316
1953	1,124
1954	516
1955	417
1956	479
1957	321
1958	363
1959	546
1960	356
1961	573
1962	387
1963	442
1964	422
1965	1,118
1966	500
1967	536
1968	729
1969	522
1970	423
1971	443
1972	579
1973	646
1974	838
1975	664
1976	679
1977	665
1978	825
1979	517
1980	572
1981	684
1982	770
1983	696
1984	1,127
1985	629
1986	1,768
1987	638
1988	881
1989	791
1990	983
1991	938
1992	1,697
1993	1,200
1994	601
1995	940
1996	1,385
1997	960
1998	1,278
1999	864
2000	1,189
2001	750
2002	801
2003	1,226
2004	1,087
2005	1,500
2006	989
2007	1,300
2008	678
2009	1,251
2010	1,552
2011	994
2012	1,087
2013	644
2014	558
2015	1,074
2016	552
2017	924
2018	616
2019	755
2020	671
2021	429
2022	1,077
2023	651
2024	912
2025	324
2026	733

Download the Data

Data for records on 1999-08-30: 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 25	592
25 to 50	22
50 to 75	6
75 to 100	4
100 to 125	1
125 to 150	0
150 to 175	0
175 to 200	1