Weather Records on 15 December 1999

621 weather records were set or tied worldwide on 15 December 1999. Highest significance: Bonney Downs, AU.

Key Facts for 15 December 1999

On 15 December 1999, 621 weather records were set or tied at long-record stations worldwide.
179 were record highs and 164 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 25 monthly and 596 daily.
Bonney Downs set a daily record precipitation of 100.0 mm (3.9 in) on 15 December 1999.
Across 168 earlier years (1793 to 2025) the same calendar date averaged 455 records.

Record Map

621 stations

621 station records on 15 December 1999 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 15 December 1999: highest significance records shown on the map
Station	Country	Type	Value	Significance
Bonney Downs	Australia	Record daily precipitation	100.0 mm (3.9 in)	66 of 100 (Major)
Noreena Downs	Australia	Record daily precipitation	97.7 mm (3.8 in)	65 of 100 (Major)
Hillside Station	Australia	Record daily precipitation	99.0 mm (3.9 in)	64 of 100 (Major)
Semjachik	Russia	Record daily precipitation	68.8 mm (2.7 in)	58 of 100 (Notable)
Penn Yan	United States	Record daily precipitation	33.0 mm (1.3 in)	57 of 100 (Notable)
Wallareenya	Australia	Record daily precipitation	52.0 mm (2.0 in)	56 of 100 (Notable)
Murchison Downs	Australia	Record daily precipitation	47.0 mm (1.9 in)	56 of 100 (Notable)
Elk City 1NE	United States	Record daily snowfall	38.4 cm (15.1 in)	56 of 100 (Notable)
Macedon Lock E30	United States	Record daily precipitation	31.8 mm (1.3 in)	56 of 100 (Notable)
Pyramid Station	Australia	Record daily precipitation	160.5 mm (6.3 in)	55 of 100 (Notable)
Forks 1 E	United States	Record daily precipitation	159.3 mm (6.3 in)	54 of 100 (Notable)
Mt Morris 2W	United States	Record daily precipitation	27.9 mm (1.1 in)	51 of 100 (Notable)
Rushford	United States	Record daily precipitation	43.2 mm (1.7 in)	50 of 100 (Notable)
Old Faithful	United States	Record daily snowfall	15.2 cm (6.0 in)	50 of 100 (Notable)
Indee	Australia	Record daily precipitation	49.0 mm (1.9 in)	49 of 100 (Notable)
Angelica	United States	Record daily precipitation	29.0 mm (1.1 in)	49 of 100 (Notable)
Avon	United States	Record daily precipitation	26.9 mm (1.1 in)	48 of 100 (Notable)
Franklinville	United States	Record daily precipitation	27.9 mm (1.1 in)	47 of 100 (Notable)
Marble Bar Comparison	Australia	Record low maximum temperature	27.5 C (81.5 F)	46 of 100 (Notable)
Neds Creek	Australia	Record daily precipitation	25.0 mm (1.0 in)	46 of 100 (Notable)
Lorna Glen	Australia	Record daily precipitation	71.0 mm (2.8 in)	44 of 100 (Notable)
Huejutla	Mexico	Record daily precipitation	64.5 mm (2.5 in)	44 of 100 (Notable)
Aurland	Norway	Record snow depth	28.0 cm (11.0 in)	43 of 100 (Notable)
Novi Sad	Serbia	Record daily precipitation	37.6 mm (1.5 in)	43 of 100 (Notable)
Potlatch 3 NNE	United States	Record daily precipitation	47.0 mm (1.9 in)	43 of 100 (Notable)
Saint Maries	United States	Record daily precipitation	36.6 mm (1.4 in)	41 of 100 (Notable)
Saint Maries	United States	Record daily snowfall	15.2 cm (6.0 in)	41 of 100 (Notable)
Sherman	United States	Record daily precipitation	50.8 mm (2.0 in)	40 of 100 (Notable)
Danville	United States	Record daily precipitation	43.2 mm (1.7 in)	40 of 100 (Notable)
Union	United States	Record daily snowfall	8.9 cm (3.5 in)	39 of 100 (Notable)
Newport	United States	Record daily precipitation	36.3 mm (1.4 in)	39 of 100 (Notable)
Tapalpa (Smn)	Mexico	Record low minimum temperature	-2.2 C (28.0 F)	38 of 100 (Notable)
Hebgen Dam	United States	Record daily snowfall	50.8 cm (20.0 in)	38 of 100 (Notable)
W Glacier	United States	Record daily snowfall	33.0 cm (13.0 in)	38 of 100 (Notable)
Old Faithful	United States	Record low maximum temperature	-10.6 C (12.9 F)	38 of 100 (Notable)
Heron 2 NW	United States	Record daily precipitation	32.5 mm (1.3 in)	37 of 100 (Notable)
Elmira	United States	Record daily precipitation	41.9 mm (1.6 in)	37 of 100 (Notable)
Corning	United States	Record daily precipitation	34.3 mm (1.4 in)	36 of 100 (Notable)
Mt Morris 2W	United States	Record daily snowfall	10.2 cm (4.0 in)	36 of 100 (Notable)
Bear Gap	United States	Record daily precipitation	38.9 mm (1.5 in)	36 of 100 (Notable)
Covington 2 WSW	United States	Record daily precipitation	30.2 mm (1.2 in)	36 of 100 (Notable)
Bamboo Creek	Australia	Record daily precipitation	36.3 mm (1.4 in)	35 of 100 (Notable)
Mulga Downs	Australia	Record daily precipitation	44.2 mm (1.7 in)	35 of 100 (Notable)
Zavizan	Croatia	Record daily precipitation	71.5 mm (2.8 in)	35 of 100 (Notable)
San Jeronimo	Mexico	Record low minimum temperature	16.7 C (62.1 F)	35 of 100 (Notable)
Tecolotlan (Dge)	Mexico	Record low minimum temperature	0.6 C (33.1 F)	35 of 100 (Notable)
Beaver Falls 1 NE	United States	Record daily precipitation	32.3 mm (1.3 in)	35 of 100 (Notable)
Renovo	United States	Record daily precipitation	32.5 mm (1.3 in)	35 of 100 (Notable)
Reading Wb City	United States	Record high minimum temperature	5.6 C (42.1 F)	35 of 100 (Notable)
Mount Florance	Australia	Record daily precipitation	33.0 mm (1.3 in)	34 of 100 (Routine)
Cerro de Ortega	Mexico	Record low minimum temperature	9.4 C (48.9 F)	34 of 100 (Routine)
Ticuman	Mexico	Record high maximum temperature	37.8 C (100.0 F)	34 of 100 (Routine)
Troy 1 NE	United States	Record daily precipitation	39.9 mm (1.6 in)	34 of 100 (Routine)
Lacrosse	United States	Record high minimum temperature	6.1 C (43.0 F)	34 of 100 (Routine)
Launceston Airport Comparison	Australia	Record high maximum temperature	29.6 C (85.3 F)	33 of 100 (Routine)
La Presumida	Mexico	Record daily precipitation	88.1 mm (3.5 in)	33 of 100 (Routine)
Lock Haven Sewage Plt	United States	Record daily precipitation	30.5 mm (1.2 in)	33 of 100 (Routine)
Sunbury	United States	Record daily precipitation	42.9 mm (1.7 in)	33 of 100 (Routine)
Earaheedy	Australia	Record daily precipitation	27.6 mm (1.1 in)	32 of 100 (Routine)
Palenque (Dge)	Mexico	Record high maximum temperature	35.0 C (95.0 F)	32 of 100 (Routine)

Counts by Type and Timescale

621 records

Records set or tied on 15 December 1999 by type: Highest daily maximum 79, Lowest daily maximum 42, Highest daily minimum 100, Lowest daily minimum 122, Heaviest daily rainfall 213, Heaviest daily snowfall 43, Deepest snow cover 22.

Records on 15 December 1999 by type
Record type	Records
Highest daily maximum	79
Lowest daily maximum	42
Highest daily minimum	100
Lowest daily minimum	122
Heaviest daily rainfall	213
Heaviest daily snowfall	43
Deepest snow cover	22

Records on 15 December 1999 by timescale: all-time 0, monthly 25, daily 596.

How Much Records Were Beaten By

466 broken records

Margins by which the 466 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 257.0. Ties are not counted.

Top 20 by Significance

15 December 1999

Top 20 records on 15 December 1999 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
15 December 1999	Bonney Downs, AU	daily rain	100.0 mm (3.9 in)	68.0 mm (2.7 in)	57 years	66 of 100 (Major)
15 December 1999	Noreena Downs, AU	daily rain	97.7 mm (3.8 in)	69.5 mm (2.7 in)	57 years	65 of 100 (Major)
15 December 1999	Hillside Station, AU	daily rain	99.0 mm (3.9 in)	70.8 mm (2.8 in)	80 years	64 of 100 (Major)
15 December 1999	Semjachik, RU	daily rain	68.8 mm (2.7 in)	51.6 mm (2.0 in)	52 years	58 of 100 (Notable)
15 December 1999	Penn Yan, US	daily rain	33.0 mm (1.3 in)	12.2 mm (0.5 in)	97 years	57 of 100 (Notable)
15 December 1999	Wallareenya, AU	daily rain	52.0 mm (2.0 in)	50.2 mm (2.0 in)	66 years	56 of 100 (Notable)
15 December 1999	Murchison Downs, AU	daily rain	47.0 mm (1.9 in)	38.6 mm (1.5 in)	57 years	56 of 100 (Notable)
15 December 1999	Elk City 1NE, US	daily snowfall	38.4 cm (15.1 in)	25.7 cm (10.1 in)	28 years	56 of 100 (Notable)
15 December 1999	Macedon Lock E30, US	daily rain	31.8 mm (1.3 in)	21.6 mm (0.9 in)	48 years	56 of 100 (Notable)
15 December 1999	Pyramid Station, AU	monthly rain	160.5 mm (6.3 in)	88.5 mm (3.5 in)	4 years	55 of 100 (Notable)
15 December 1999	Forks 1 E, US	daily rain	159.3 mm (6.3 in)	55.2 mm (2.2 in)	76 years	54 of 100 (Notable)
15 December 1999	Mt Morris 2W, US	daily rain	27.9 mm (1.1 in)	15.2 mm (0.6 in)	44 years	51 of 100 (Notable)
15 December 1999	Rushford, US	daily rain	43.2 mm (1.7 in)	35.1 mm (1.4 in)	21 years	50 of 100 (Notable)
15 December 1999	Old Faithful, US	daily snowfall	15.2 cm (6.0 in)	10.1 cm (4.0 in)	94 years	50 of 100 (Notable)
15 December 1999	Indee, AU	daily rain	49.0 mm (1.9 in)	43.9 mm (1.7 in)	25 years	49 of 100 (Notable)
15 December 1999	Angelica, US	daily rain	29.0 mm (1.1 in)	5.4 mm (0.21 in)	97 years	49 of 100 (Notable)
15 December 1999	Avon, US	daily rain	26.9 mm (1.1 in)	5.1 mm (0.20 in)	101 years	48 of 100 (Notable)
15 December 1999	Franklinville, US	daily rain	27.9 mm (1.1 in)	3.8 mm (0.15 in)	101 years	47 of 100 (Notable)
15 December 1999	Marble Bar Comparison, AU	daily low max	27.5 C (81.5 F)	6.4 C (11.5 F)	53 years	46 of 100 (Notable)
15 December 1999	Neds Creek, AU	daily rain	25.0 mm (1.0 in)	24.5 mm (1.0 in)	48 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

1793 to 1999

Records set or tied on this calendar date in each year from 1793 to 1999. 1999 had 621 records.

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

Records on 12-15 in each year
Year	Records
1793	1
1796	1
1798	1
1800	1
1808	3
1810	1
1814	3
1815	1
1825	1
1831	1
1840	2
1844	2
1846	3
1847	1
1854	3
1859	2
1863	1
1864	1
1866	1
1867	2
1868	1
1869	1
1870	1
1873	1
1874	1
1878	4
1879	2
1880	2
1881	3
1882	2
1883	1
1885	1
1886	1
1889	3
1890	1
1891	2
1892	4
1893	1
1894	4
1895	1
1896	5
1897	2
1899	12
1900	5
1901	21
1902	3
1903	7
1904	9
1905	6
1906	9
1907	10
1908	5
1909	5
1910	4
1911	23
1912	42
1913	13
1914	239
1915	180
1916	40
1917	40
1918	54
1919	28
1920	35
1921	26
1922	65
1923	132
1924	358
1925	187
1926	226
1927	235
1928	388
1929	500
1930	160
1931	284
1932	385
1933	796
1934	199
1935	140
1936	286
1937	310
1938	100
1939	637
1940	464
1941	373
1942	385
1943	486
1944	281
1945	420
1946	521
1947	634
1948	1,239
1949	135
1950	292
1951	962
1952	367
1953	270
1954	413
1955	371
1956	531
1957	304
1958	531
1959	560
1960	313
1961	883
1962	979
1963	670
1964	371
1965	759
1966	275
1967	948
1968	510
1969	352
1970	215
1971	1,739
1972	1,159
1973	615
1974	511
1975	1,230
1976	349
1977	963
1978	499
1979	560
1980	1,085
1981	1,243
1982	831
1983	1,229
1984	1,397
1985	1,077
1986	502
1987	1,740
1988	519
1989	2,753
1990	846
1991	636
1992	1,263
1993	734
1994	676
1995	848
1996	727
1997	1,521
1998	1,216
1999	621
2000	1,154
2001	1,026
2002	831
2003	846
2004	795
2005	953
2006	1,491
2007	973
2008	1,789
2009	930
2010	1,705
2011	780
2012	1,058
2013	701
2014	1,045
2015	1,398
2016	1,024
2017	332
2018	539
2019	547
2020	400
2021	1,182
2022	1,057
2023	794
2024	369
2025	2,115

Download the Data

Data for records on 1999-12-15: 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	441
50 to 100	17
100 to 150	4
150 to 200	3
200 to 250	0
250 to 300	1