Weather Records on 9 May 1999

970 weather records were set or tied worldwide on 9 May 1999. Highest significance: Corozal Substn, PR.

Key Facts for 9 May 1999

On 9 May 1999, 970 weather records were set or tied at long-record stations worldwide.
240 were record highs and 531 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 33 monthly and 937 daily.
Corozal Substn set a daily record precipitation of 142.0 mm (5.6 in) on 9 May 1999.
Across 166 earlier years (1793 to 2026) the same calendar date averaged 429 records.

Record Map

970 stations

970 station records on 9 May 1999 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 9 May 1999: highest significance records shown on the map
Station	Country	Type	Value	Significance
Corozal Substn	Puerto Rico [United States]	Record daily precipitation	142.0 mm (5.6 in)	64 of 100 (Major)
Austin 1 W	United States	Record daily snowfall	20.3 cm (8.0 in)	59 of 100 (Notable)
Pega	Brazil	Record daily precipitation	28.7 mm (1.1 in)	53 of 100 (Notable)
Temilpa	Mexico	Record daily precipitation	88.9 mm (3.5 in)	48 of 100 (Notable)
Gullspang	Sweden	Record daily precipitation	32.3 mm (1.3 in)	47 of 100 (Notable)
Cunnamulla Post Office	Australia	Record daily precipitation	30.8 mm (1.2 in)	46 of 100 (Notable)
Itamaraju	Brazil	Record daily precipitation	43.9 mm (1.7 in)	46 of 100 (Notable)
Ixcateopan de Tlapa	Mexico	Record daily precipitation	48.8 mm (1.9 in)	46 of 100 (Notable)
Lowville	United States	Record daily precipitation	33.3 mm (1.3 in)	46 of 100 (Notable)
Rocksprings	United States	Record daily precipitation	66.0 mm (2.6 in)	46 of 100 (Notable)
Dillingham FAA AP	United States	Record daily snowfall	7.6 cm (3.0 in)	46 of 100 (Notable)
Pinsk	Belarus	Record daily precipitation	25.8 mm (1.0 in)	43 of 100 (Notable)
Karlsborg_Mo	Sweden	Record daily precipitation	27.1 mm (1.1 in)	43 of 100 (Notable)
Sorbytorp	Sweden	Record daily precipitation	29.0 mm (1.1 in)	43 of 100 (Notable)
Mimiapan	Mexico	Record daily precipitation	33.8 mm (1.3 in)	42 of 100 (Notable)
Beulah	United States	Record low minimum temperature	-5.6 C (21.9 F)	42 of 100 (Notable)
Palenque (Dge)	Mexico	Record high minimum temperature	30.0 C (86.0 F)	41 of 100 (Notable)
Mayaguez City	Puerto Rico [United States]	Record high minimum temperature	23.9 C (75.0 F)	41 of 100 (Notable)
Sveg	Sweden	Record low maximum temperature	0.5 C (32.9 F)	41 of 100 (Notable)
Lumpkin 2 SE	United States	Record low maximum temperature	19.4 C (66.9 F)	41 of 100 (Notable)
Ennis	United States	Record daily snowfall	5.1 cm (2.0 in)	41 of 100 (Notable)
Palmerville	Australia	Record low minimum temperature	15.0 C (59.0 F)	40 of 100 (Notable)
Linkoeping-Malmslaett	Sweden	Record low maximum temperature	5.3 C (41.5 F)	40 of 100 (Notable)
Erikstad	Sweden	Record daily precipitation	25.5 mm (1.0 in)	40 of 100 (Notable)
Tartu-Toravere	Estonia	Record low minimum temperature	-5.9 C (21.4 F)	38 of 100 (Notable)
Alturas	United States	Record low minimum temperature	-6.7 C (19.9 F)	38 of 100 (Notable)
Riverside 7 SSW	United States	Record low minimum temperature	-9.4 C (15.1 F)	38 of 100 (Notable)
Biskra	Algeria	Record high minimum temperature	23.7 C (74.7 F)	37 of 100 (Notable)
Vladikavkaz	Russia	Record low minimum temperature	-0.6 C (30.9 F)	37 of 100 (Notable)
Dingle	Sweden	Record daily precipitation	25.5 mm (1.0 in)	37 of 100 (Notable)
Saffle	Sweden	Record daily precipitation	34.5 mm (1.4 in)	37 of 100 (Notable)
Libby 1 NE Rs	United States	Record low maximum temperature	8.9 C (48.0 F)	37 of 100 (Notable)
Bolivar	United States	Record daily precipitation	26.2 mm (1.0 in)	37 of 100 (Notable)
Davenport	United States	Record low minimum temperature	-5.6 C (21.9 F)	37 of 100 (Notable)
Falun	Sweden	Record low maximum temperature	3.5 C (38.3 F)	36 of 100 (Notable)
Angleton 2 W	United States	Record high minimum temperature	26.7 C (80.1 F)	36 of 100 (Notable)
Spokane Intl AP	United States	Record low minimum temperature	-2.8 C (27.0 F)	36 of 100 (Notable)
Oestersund-Froesoen	Sweden	Record low maximum temperature	2.7 C (36.9 F)	35 of 100 (Notable)
Torntorp	Sweden	Record daily precipitation	29.1 mm (1.1 in)	35 of 100 (Notable)
Green Mt Dam	United States	Record daily snowfall	7.6 cm (3.0 in)	35 of 100 (Notable)
McDermitt	United States	Record low maximum temperature	8.9 C (48.0 F)	35 of 100 (Notable)
Odessa	United States	Record low maximum temperature	12.2 C (54.0 F)	35 of 100 (Notable)
Sanya	China	Record low maximum temperature	27.7 C (81.9 F)	34 of 100 (Routine)
Pte de Chassiron	France	Record high maximum temperature	24.0 C (75.2 F)	34 of 100 (Routine)
Three Lynx	United States	Record low maximum temperature	5.0 C (41.0 F)	34 of 100 (Routine)
Melbourne WFO	United States	Record daily precipitation	58.2 mm (2.3 in)	33 of 100 (Routine)
Emmett 2 E	United States	Record low minimum temperature	-2.2 C (28.0 F)	33 of 100 (Routine)
Potlatch 3 NNE	United States	Record low maximum temperature	6.7 C (44.1 F)	33 of 100 (Routine)
Ft Hall 1 NNE	United States	Record low maximum temperature	8.9 C (48.0 F)	32 of 100 (Routine)
Yerevan	Armenia	Record low maximum temperature	15.2 C (59.4 F)	31 of 100 (Routine)
Umba	Russia	Record low minimum temperature	-9.4 C (15.1 F)	31 of 100 (Routine)
Barguzin	Russia	Record high minimum temperature	8.3 C (46.9 F)	31 of 100 (Routine)
Malung	Sweden	Record low maximum temperature	2.4 C (36.3 F)	31 of 100 (Routine)
Polebridge	United States	Record low minimum temperature	-11.7 C (10.9 F)	31 of 100 (Routine)
Crater Lake Nps HQ	United States	Record low minimum temperature	-13.3 C (8.1 F)	31 of 100 (Routine)
Tashkent	Uzbekistan	Record high minimum temperature	18.7 C (65.7 F)	31 of 100 (Routine)
Solnethnaya	Russia	Record high maximum temperature	19.0 C (66.2 F)	30 of 100 (Routine)
Carrington	United States	Record daily precipitation	25.7 mm (1.0 in)	30 of 100 (Routine)
Riddle	United States	Record low minimum temperature	-0.6 C (30.9 F)	30 of 100 (Routine)
Riverside 7 SSW	United States	Record low maximum temperature	8.9 C (48.0 F)	30 of 100 (Routine)

Counts by Type and Timescale

970 records

Records set or tied on 9 May 1999 by type: Highest daily maximum 109, Lowest daily maximum 257, Highest daily minimum 131, Lowest daily minimum 274, Heaviest daily rainfall 167, Heaviest daily snowfall 24, Deepest snow cover 8.

Records on 9 May 1999 by type
Record type	Records
Highest daily maximum	109
Lowest daily maximum	257
Highest daily minimum	131
Lowest daily minimum	274
Heaviest daily rainfall	167
Heaviest daily snowfall	24
Deepest snow cover	8

Records on 9 May 1999 by timescale: all-time 0, monthly 33, daily 937.

How Much Records Were Beaten By

729 broken records

Margins by which the 729 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 356.0. Ties are not counted.

Top 20 by Significance

9 May 1999

Top 20 records on 9 May 1999 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
9 May 1999	Corozal Substn, PR	daily rain	142.0 mm (5.6 in)	95.8 mm (3.8 in)	62 years	64 of 100 (Major)
9 May 1999	Austin 1 W, US	daily snowfall	20.3 cm (8.0 in)	20.3 cm (8.0 in)	48 years	59 of 100 (Notable)
9 May 1999	Pega, BR	daily rain	28.7 mm (1.1 in)	28.6 mm (1.1 in)	48 years	53 of 100 (Notable)
9 May 1999	Temilpa, MX	monthly rain	88.9 mm (3.5 in)	32.5 mm (1.3 in)	3 years	48 of 100 (Notable)
9 May 1999	Gullspang, SE	daily rain	32.3 mm (1.3 in)	19.9 mm (0.8 in)	9 years	47 of 100 (Notable)
9 May 1999	Cunnamulla Post Office, AU	daily rain	30.8 mm (1.2 in)	18.9 mm (0.7 in)	68 years	46 of 100 (Notable)
9 May 1999	Itamaraju, BR	daily rain	43.9 mm (1.7 in)	25.9 mm (1.0 in)	37 years	46 of 100 (Notable)
9 May 1999	Ixcateopan de Tlapa, MX	daily rain	48.8 mm (1.9 in)	38.9 mm (1.5 in)	38 years	46 of 100 (Notable)
9 May 1999	Lowville, US	daily rain	33.3 mm (1.3 in)	8.4 mm (0.33 in)	89 years	46 of 100 (Notable)
9 May 1999	Rocksprings, US	daily rain	66.0 mm (2.6 in)	33.7 mm (1.3 in)	56 years	46 of 100 (Notable)
9 May 1999	Dillingham FAA AP, US	daily snowfall	7.6 cm (3.0 in)	7.6 cm (3.0 in)	78 years	46 of 100 (Notable)
9 May 1999	Pinsk, BY	daily rain	25.8 mm (1.0 in)	2.6 mm (0.10 in)	98 years	43 of 100 (Notable)
9 May 1999	Karlsborg_Mo, SE	daily rain	27.1 mm (1.1 in)	19.6 mm (0.8 in)	1 year	43 of 100 (Notable)
9 May 1999	Sorbytorp, SE	daily rain	29.0 mm (1.1 in)	13.2 mm (0.5 in)	37 years	43 of 100 (Notable)
9 May 1999	Mimiapan, MX	daily rain	33.8 mm (1.3 in)	20.8 mm (0.8 in)	30 years	42 of 100 (Notable)
9 May 1999	Beulah, US	daily low min	-5.6 C (21.9 F)	1.2 C (2.2 F)	104 years	42 of 100 (Notable)
9 May 1999	Palenque (Dge), MX	daily high min	30.0 C (86.0 F)	5.0 C (9.0 F)	41 years	41 of 100 (Notable)
9 May 1999	Mayaguez City, PR	daily high min	23.9 C (75.0 F)	0.6 C (1.1 F)	96 years	41 of 100 (Notable)
9 May 1999	Sveg, SE	daily low max	0.5 C (32.9 F)	1.5 C (2.7 F)	98 years	41 of 100 (Notable)
9 May 1999	Lumpkin 2 SE, US	daily low max	19.4 C (66.9 F)	1.2 C (2.2 F)	96 years	41 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

1793 to 1999

Records set or tied on this calendar date in each year from 1793 to 1999. 1999 had 970 records.

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

Records on 05-09 in each year
Year	Records
1793	1
1795	1
1806	1
1810	1
1823	1
1834	1
1838	1
1843	1
1845	2
1846	1
1848	1
1850	2
1855	2
1857	1
1858	1
1861	1
1862	1
1864	2
1865	2
1867	2
1872	1
1873	2
1874	1
1875	2
1879	4
1880	3
1882	1
1883	2
1884	3
1885	3
1889	3
1890	3
1891	3
1892	1
1893	1
1895	2
1896	4
1897	3
1898	3
1899	2
1900	2
1901	9
1902	8
1903	9
1904	14
1905	34
1906	41
1907	11
1908	16
1909	34
1910	45
1911	23
1912	23
1913	15
1914	43
1915	27
1916	26
1917	50
1918	49
1919	47
1920	56
1921	102
1922	45
1923	461
1924	262
1925	123
1926	196
1927	343
1928	302
1929	166
1930	526
1931	411
1932	132
1933	482
1934	750
1935	111
1936	622
1937	128
1938	171
1939	345
1940	237
1941	335
1942	180
1943	524
1944	412
1945	538
1946	278
1947	1,145
1948	379
1949	417
1950	660
1951	188
1952	348
1953	507
1954	489
1955	288
1956	722
1957	505
1958	355
1959	252
1960	748
1961	516
1962	435
1963	1,103
1964	503
1965	730
1966	994
1967	681
1968	545
1969	653
1970	372
1971	338
1972	587
1973	386
1974	699
1975	465
1976	714
1977	931
1978	649
1979	1,605
1980	1,030
1981	639
1982	523
1983	872
1984	892
1985	829
1986	1,253
1987	1,481
1988	594
1989	1,347
1990	850
1991	759
1992	1,476
1993	967
1994	573
1995	960
1996	1,260
1997	1,088
1998	1,182
1999	970
2000	1,114
2001	969
2002	1,489
2003	1,802
2004	926
2005	851
2006	738
2007	765
2008	693
2009	816
2010	764
2011	1,104
2012	686
2013	684
2014	754
2015	689
2016	917
2017	539
2018	879
2019	1,043
2020	1,673
2021	501
2022	1,308
2023	474
2024	792
2025	622
2026	309

Download the Data

Data for records on 1999-05-09: 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 50	718
50 to 100	7
100 to 150	1
150 to 200	0
200 to 250	1
250 to 300	1
300 to 350	0
350 to 400	1