Weather Records on 20 August 1999

810 weather records were set or tied worldwide on 20 August 1999. Highest significance: Newark Ag Farm, US.

Key Facts for 20 August 1999

On 20 August 1999, 810 weather records were set or tied at long-record stations worldwide.
500 were record highs and 155 were record lows, counting maximum and minimum temperature.
By timescale, 13 were all-time records, 23 monthly and 774 daily.
Newark Ag Farm set a daily record precipitation of 78.2 mm (3.1 in) on 20 August 1999.
Across 163 earlier years (1797 to 2026) the same calendar date averaged 453 records.

Record Map

810 stations

810 station records on 20 August 1999 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 August 1999: highest significance records shown on the map
Station	Country	Type	Value	Significance
Newark Ag Farm	United States	Record daily precipitation	78.2 mm (3.1 in)	64 of 100 (Major)
Avon Park 2 W	United States	Record low minimum temperature	16.7 C (62.1 F)	60 of 100 (Major)
Olean	United States	Record daily precipitation	56.1 mm (2.2 in)	60 of 100 (Major)
Minatitlan	Mexico	Record daily precipitation	177.8 mm (7.0 in)	58 of 100 (Notable)
Angelica	United States	Record daily precipitation	64.3 mm (2.5 in)	57 of 100 (Notable)
Kilauea 1134	United States	Record daily precipitation	39.6 mm (1.6 in)	57 of 100 (Notable)
Prado	Brazil	Record daily precipitation	67.1 mm (2.6 in)	56 of 100 (Notable)
Ruston la Tech	United States	Record high maximum temperature	42.8 C (109.0 F)	56 of 100 (Notable)
Laurelton Ctr	United States	Record daily precipitation	109.2 mm (4.3 in)	56 of 100 (Notable)
Penn Yan	United States	Record daily precipitation	57.2 mm (2.3 in)	52 of 100 (Notable)
Tamdy	Uzbekistan	Record low minimum temperature	0.0 C (32.0 F)	52 of 100 (Notable)
Chapingo (Dge)	Mexico	Record daily precipitation	35.8 mm (1.4 in)	50 of 100 (Notable)
Ahuatepec	Mexico	Record daily precipitation	50.8 mm (2.0 in)	50 of 100 (Notable)
Bastia	France	Record high maximum temperature	38.3 C (100.9 F)	48 of 100 (Notable)
El Morro Natl Mon	United States	Record daily precipitation	47.8 mm (1.9 in)	48 of 100 (Notable)
Hornell Almond Dam	United States	Record daily precipitation	63.0 mm (2.5 in)	47 of 100 (Notable)
Orangeburg 2	United States	Record daily precipitation	109.7 mm (4.3 in)	47 of 100 (Notable)
New London Lock #22	United States	Record daily precipitation	40.6 mm (1.6 in)	46 of 100 (Notable)
Atenco	Mexico	Record daily precipitation	42.9 mm (1.7 in)	44 of 100 (Notable)
Cerepovec	Russia	Record daily precipitation	34.5 mm (1.4 in)	44 of 100 (Notable)
Nevelsk	Russia	Record daily precipitation	72.2 mm (2.8 in)	44 of 100 (Notable)
Thomasville	United States	Record high maximum temperature	38.9 C (102.0 F)	43 of 100 (Notable)
Waynesboro 2 W	United States	Record high maximum temperature	38.9 C (102.0 F)	43 of 100 (Notable)
Mt Pleasant	United States	Record high minimum temperature	28.3 C (82.9 F)	43 of 100 (Notable)
Nashville	United States	Record high maximum temperature	41.1 C (106.0 F)	42 of 100 (Notable)
Friendship 7 SW	United States	Record daily precipitation	54.9 mm (2.2 in)	42 of 100 (Notable)
Ajaccio	France	Record high minimum temperature	25.6 C (78.1 F)	41 of 100 (Notable)
Anucino	Russia	Record daily precipitation	64.0 mm (2.5 in)	41 of 100 (Notable)
Magnolia	United States	Record high maximum temperature	42.8 C (109.0 F)	41 of 100 (Notable)
Butler	United States	Record daily precipitation	28.2 mm (1.1 in)	41 of 100 (Notable)
Itamaraju	Brazil	Record daily precipitation	44.5 mm (1.8 in)	40 of 100 (Notable)
St Joseph 3 N	United States	Record high maximum temperature	37.8 C (100.0 F)	40 of 100 (Notable)
Smoky Valley - Carvers	United States	Record daily precipitation	25.9 mm (1.0 in)	40 of 100 (Notable)
Ajaccio	France	Record high maximum temperature	38.7 C (101.7 F)	39 of 100 (Notable)
Allende	Mexico	Record high minimum temperature	27.8 C (82.0 F)	39 of 100 (Notable)
Woodville 4 ESE	United States	Record high minimum temperature	25.6 C (78.1 F)	39 of 100 (Notable)
Allegany Sp	United States	Record daily precipitation	44.7 mm (1.8 in)	39 of 100 (Notable)
Portageville 1N	United States	Record daily precipitation	31.0 mm (1.2 in)	39 of 100 (Notable)
Holly Hill	United States	Record daily precipitation	74.7 mm (2.9 in)	39 of 100 (Notable)
Cajon de Pea	Mexico	Record daily precipitation	142.5 mm (5.6 in)	38 of 100 (Notable)
Pirovskoe	Russia	Record daily precipitation	38.1 mm (1.5 in)	38 of 100 (Notable)
El Capitan Dam	United States	Record low minimum temperature	1.7 C (35.1 F)	38 of 100 (Notable)
Aberdeen	United States	Record high maximum temperature	40.0 C (104.0 F)	38 of 100 (Notable)
Carthage	United States	Record high maximum temperature	40.6 C (105.1 F)	38 of 100 (Notable)
Powhatan	United States	Record daily precipitation	64.8 mm (2.6 in)	38 of 100 (Notable)
Conceicao da Barra	Brazil	Record daily precipitation	32.0 mm (1.3 in)	37 of 100 (Notable)
Guajataca Dam	Puerto Rico [United States]	Record daily precipitation	59.4 mm (2.3 in)	37 of 100 (Notable)
Carthage	Tunisia	Record high maximum temperature	45.3 C (113.5 F)	37 of 100 (Notable)
Winnsboro 5 SSE	United States	Record high maximum temperature	40.6 C (105.1 F)	37 of 100 (Notable)
Bradford Cntrl Fs	United States	Record daily precipitation	86.9 mm (3.4 in)	37 of 100 (Notable)
Natural Bridges Nm	United States	Record daily precipitation	28.2 mm (1.1 in)	37 of 100 (Notable)
Tamanrasset	Algeria	Record high maximum temperature	41.0 C (105.8 F)	36 of 100 (Notable)
Marseille Obs. Palais-Lonchamp	France	Record high minimum temperature	22.3 C (72.1 F)	36 of 100 (Notable)
Bastrop	United States	Record high maximum temperature	40.6 C (105.1 F)	36 of 100 (Notable)
Calhoun 2 N	United States	Record high maximum temperature	42.2 C (108.0 F)	36 of 100 (Notable)
Hampton 1S	United States	Record daily precipitation	66.0 mm (2.6 in)	36 of 100 (Notable)
Athens Ben Epps AP	United States	Record daily precipitation	50.8 mm (2.0 in)	36 of 100 (Notable)
Ixcateopan de Tlapa	Mexico	Record daily precipitation	80.8 mm (3.2 in)	35 of 100 (Notable)
Achinsk	Russia	Record high minimum temperature	18.6 C (65.5 F)	34 of 100 (Routine)
Krasnojarsk	Russia	Record high minimum temperature	19.5 C (67.1 F)	34 of 100 (Routine)

Counts by Type and Timescale

810 records

Records set or tied on 20 August 1999 by type: Highest daily maximum 292, Lowest daily maximum 74, Highest daily minimum 208, Lowest daily minimum 81, Heaviest daily rainfall 155.

Records on 20 August 1999 by type
Record type	Records
Highest daily maximum	292
Lowest daily maximum	74
Highest daily minimum	208
Lowest daily minimum	81
Heaviest daily rainfall	155
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 20 August 1999 by timescale: all-time 13, monthly 23, daily 774.

How Much Records Were Beaten By

574 broken records

Margins by which the 574 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 83.8. Ties are not counted.

Top 20 by Significance

20 August 1999

Top 20 records on 20 August 1999 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 August 1999	Newark Ag Farm, US	daily rain	78.2 mm (3.1 in)	38.3 mm (1.5 in)	94 years	64 of 100 (Major)
20 August 1999	Avon Park 2 W, US	daily low min	16.7 C (62.1 F)	2.7 C (4.9 F)	88 years	60 of 100 (Major)
20 August 1999	Olean, US	daily rain	56.1 mm (2.2 in)	31.2 mm (1.2 in)	62 years	60 of 100 (Major)
20 August 1999	Minatitlan, MX	monthly rain	177.8 mm (7.0 in)	83.8 mm (3.3 in)	16 years	58 of 100 (Notable)
20 August 1999	Angelica, US	daily rain	64.3 mm (2.5 in)	21.9 mm (0.9 in)	92 years	57 of 100 (Notable)
20 August 1999	Kilauea 1134, US	daily rain	39.6 mm (1.6 in)	19.8 mm (0.8 in)	88 years	57 of 100 (Notable)
20 August 1999	Prado, BR	daily rain	67.1 mm (2.6 in)	52.9 mm (2.1 in)	42 years	56 of 100 (Notable)
20 August 1999	Ruston la Tech, US	all-time high max	42.8 C (109.0 F)	0.6 C (1.1 F)	81 years	56 of 100 (Notable)
20 August 1999	Laurelton Ctr, US	monthly rain	109.2 mm (4.3 in)	48.7 mm (1.9 in)	5 years	56 of 100 (Notable)
20 August 1999	Penn Yan, US	daily rain	57.2 mm (2.3 in)	33.3 mm (1.3 in)	38 years	52 of 100 (Notable)
20 August 1999	Tamdy, UZ	monthly low min	0.0 C (32.0 F)	7.4 C (13.3 F)	55 years	52 of 100 (Notable)
20 August 1999	Chapingo (Dge), MX	daily rain	35.8 mm (1.4 in)	25.4 mm (1.0 in)	36 years	50 of 100 (Notable)
20 August 1999	Ahuatepec, MX	daily rain	50.8 mm (2.0 in)	33.5 mm (1.3 in)	42 years	50 of 100 (Notable)
20 August 1999	Bastia, FR	all-time high max	38.3 C (100.9 F)	1.8 C (3.2 F)	52 years	48 of 100 (Notable)
20 August 1999	El Morro Natl Mon, US	daily rain	47.8 mm (1.9 in)	35.9 mm (1.4 in)	9 years	48 of 100 (Notable)
20 August 1999	Hornell Almond Dam, US	daily rain	63.0 mm (2.5 in)	40.1 mm (1.6 in)	9 years	47 of 100 (Notable)
20 August 1999	Orangeburg 2, US	daily rain	109.7 mm (4.3 in)	48.0 mm (1.9 in)	45 years	47 of 100 (Notable)
20 August 1999	New London Lock #22, US	daily rain	40.6 mm (1.6 in)	23.1 mm (0.9 in)	64 years	46 of 100 (Notable)
20 August 1999	Atenco, MX	daily rain	42.9 mm (1.7 in)	21.8 mm (0.9 in)	36 years	44 of 100 (Notable)
20 August 1999	Cerepovec, RU	daily rain	34.5 mm (1.4 in)	27.4 mm (1.1 in)	0 years	44 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 1999

Records set or tied on this calendar date in each year from 1797 to 1999. 1999 had 810 records.

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

Records on 08-20 in each year
Year	Records
1797	1
1807	1
1809	2
1816	1
1830	1
1832	1
1838	1
1840	1
1842	1
1846	1
1849	1
1850	1
1852	1
1858	3
1863	5
1867	4
1870	3
1871	1
1873	1
1875	2
1877	1
1883	2
1884	2
1885	6
1886	1
1888	1
1889	2
1890	2
1891	2
1892	6
1893	1
1894	1
1895	1
1896	5
1897	6
1898	1
1899	5
1900	7
1901	12
1902	3
1903	7
1904	30
1905	7
1906	26
1907	15
1908	21
1909	69
1910	7
1911	18
1912	25
1913	23
1914	15
1915	14
1916	74
1917	51
1918	69
1919	25
1920	47
1921	23
1922	52
1923	83
1924	132
1925	193
1926	187
1927	338
1928	101
1929	213
1930	318
1931	214
1932	299
1933	324
1934	376
1935	339
1936	543
1937	537
1938	250
1939	448
1940	695
1941	230
1942	429
1943	436
1944	355
1945	398
1946	349
1947	988
1948	403
1949	431
1950	1,341
1951	824
1952	425
1953	441
1954	476
1955	848
1956	678
1957	342
1958	281
1959	764
1960	465
1961	520
1962	684
1963	577
1964	629
1965	470
1966	1,094
1967	657
1968	862
1969	608
1970	414
1971	585
1972	522
1973	490
1974	565
1975	411
1976	894
1977	860
1978	563
1979	1,009
1980	991
1981	856
1982	620
1983	1,465
1984	696
1985	666
1986	819
1987	564
1988	991
1989	603
1990	1,262
1991	804
1992	1,168
1993	759
1994	719
1995	1,113
1996	900
1997	1,214
1998	802
1999	810
2000	989
2001	909
2002	1,208
2003	1,031
2004	1,333
2005	1,112
2006	851
2007	1,955
2008	1,170
2009	1,414
2010	1,028
2011	987
2012	1,086
2013	545
2014	582
2015	1,075
2016	872
2017	324
2018	657
2019	698
2020	1,051
2021	1,028
2022	1,038
2023	1,479
2024	589
2025	1,134
2026	985

Download the Data

Data for records on 1999-08-20: 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	534
20 to 40	33
40 to 60	6
60 to 80	0
80 to 100	1