Weather Records on 17 December 1999

901 weather records were set or tied worldwide on 17 December 1999. Highest significance: Nappa Merrie, AU.

Key Facts for 17 December 1999

On 17 December 1999, 901 weather records were set or tied at long-record stations worldwide.
221 were record highs and 229 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 15 monthly and 885 daily.
Nappa Merrie set a monthly record daily precipitation of 81.8 mm (3.2 in) on 17 December 1999.
Across 160 earlier years (1793 to 2025) the same calendar date averaged 460 records.

Record Map

901 stations

901 station records on 17 December 1999 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 December 1999: highest significance records shown on the map
Station	Country	Type	Value	Significance
Nappa Merrie	Australia	Record daily precipitation	81.8 mm (3.2 in)	62 of 100 (Major)
Grong Grong (Junee St)	Australia	Record daily precipitation	39.0 mm (1.5 in)	61 of 100 (Major)
Sarajevo	Bosnia and Herzegovina	Record daily precipitation	69.0 mm (2.7 in)	59 of 100 (Notable)
Koetong	Australia	Record daily precipitation	61.4 mm (2.4 in)	56 of 100 (Notable)
Wilcannia (Billilla)	Australia	Record daily precipitation	31.0 mm (1.2 in)	55 of 100 (Notable)
Walwa	Australia	Record daily precipitation	37.4 mm (1.5 in)	55 of 100 (Notable)
Wantabadgery	Australia	Record daily precipitation	26.0 mm (1.0 in)	53 of 100 (Notable)
Peechelba East	Australia	Record daily precipitation	72.0 mm (2.8 in)	52 of 100 (Notable)
Coolamon Post Office	Australia	Record daily precipitation	27.0 mm (1.1 in)	51 of 100 (Notable)
Adelong Post Office	Australia	Record daily precipitation	32.6 mm (1.3 in)	50 of 100 (Notable)
Towong Upper	Australia	Record daily precipitation	57.0 mm (2.2 in)	50 of 100 (Notable)
Delmore Downs	Australia	Record daily precipitation	50.0 mm (2.0 in)	49 of 100 (Notable)
Nariel Creek (Simpson)	Australia	Record daily precipitation	51.8 mm (2.0 in)	49 of 100 (Notable)
Hungerford	Australia	Record daily precipitation	39.4 mm (1.6 in)	48 of 100 (Notable)
Dartmouth Reservoir	Australia	Record daily precipitation	63.8 mm (2.5 in)	48 of 100 (Notable)
Haikou	China	Record daily precipitation	52.7 mm (2.1 in)	48 of 100 (Notable)
Turku Turun Lentoasema	Finland	Record daily precipitation	25.7 mm (1.0 in)	48 of 100 (Notable)
Morstone Station	Australia	Record daily precipitation	66.0 mm (2.6 in)	47 of 100 (Notable)
Fowlers Gap Research Station	Australia	Record daily precipitation	25.6 mm (1.0 in)	47 of 100 (Notable)
Kergunyah South	Australia	Record daily precipitation	49.8 mm (2.0 in)	47 of 100 (Notable)
Mitta Mitta Forestry	Australia	Record daily precipitation	87.0 mm (3.4 in)	47 of 100 (Notable)
Cordillo Downs	Australia	Record daily precipitation	37.4 mm (1.5 in)	46 of 100 (Notable)
Tumut (Wattle Cres)	Australia	Record daily precipitation	28.2 mm (1.1 in)	46 of 100 (Notable)
Oujda	Morocco	Record low maximum temperature	2.6 C (36.7 F)	46 of 100 (Notable)
Leeton Caravan Park	Australia	Record daily precipitation	35.4 mm (1.4 in)	45 of 100 (Notable)
Arrabury Station	Australia	Record daily precipitation	47.0 mm (1.9 in)	44 of 100 (Notable)
Orientos Station	Australia	Record daily precipitation	46.0 mm (1.8 in)	44 of 100 (Notable)
Boras	Sweden	Record daily precipitation	34.3 mm (1.4 in)	44 of 100 (Notable)
Mungeranie	Australia	Record daily precipitation	28.6 mm (1.1 in)	43 of 100 (Notable)
Ulricehamn	Sweden	Record daily precipitation	29.3 mm (1.2 in)	43 of 100 (Notable)
Arltunga	Australia	Record daily precipitation	38.2 mm (1.5 in)	42 of 100 (Notable)
Matong (Main Street)	Australia	Record daily precipitation	43.0 mm (1.7 in)	42 of 100 (Notable)
Wakamatsu	Japan	Record daily precipitation	39.9 mm (1.6 in)	42 of 100 (Notable)
East Sale Comparison	Australia	Record daily precipitation	28.0 mm (1.1 in)	41 of 100 (Notable)
Aurland	Norway	Record snow depth	28.0 cm (11.0 in)	41 of 100 (Notable)
Owen Springs	Australia	Record daily precipitation	33.0 mm (1.3 in)	40 of 100 (Notable)
Grong Grong (Berembed)	Australia	Record daily precipitation	26.6 mm (1.0 in)	40 of 100 (Notable)
Mc Minnville	United States	Record daily precipitation	55.9 mm (2.2 in)	40 of 100 (Notable)
Narrandera Airport	Australia	Record daily precipitation	39.6 mm (1.6 in)	39 of 100 (Notable)
Hay (Epsom Downs)	Australia	Record daily precipitation	57.0 mm (2.2 in)	39 of 100 (Notable)
Indigo	Australia	Record daily precipitation	51.6 mm (2.0 in)	39 of 100 (Notable)
Newport	United States	Record high minimum temperature	10.6 C (51.1 F)	39 of 100 (Notable)
Burrinjuck Dam	Australia	Record daily precipitation	26.2 mm (1.0 in)	38 of 100 (Notable)
Vik I Sogn III	Norway	Record snow depth	38.0 cm (15.0 in)	38 of 100 (Notable)
Sonora	United States	Record low minimum temperature	-10.0 C (14.0 F)	38 of 100 (Notable)
Napperby	Australia	Record daily precipitation	70.2 mm (2.8 in)	37 of 100 (Notable)
Mount Horeb (Marathorn)	Australia	Record daily precipitation	35.4 mm (1.4 in)	37 of 100 (Notable)
Ganmain Post Office	Australia	Record daily precipitation	31.4 mm (1.2 in)	37 of 100 (Notable)
Leeton (Yarramundi)	Australia	Record daily precipitation	36.6 mm (1.4 in)	37 of 100 (Notable)
Rutherglen Research	Australia	Record daily precipitation	40.4 mm (1.6 in)	37 of 100 (Notable)
Glen Helen	Australia	Record daily precipitation	35.0 mm (1.4 in)	36 of 100 (Notable)
Nockatunga Station	Australia	Record daily precipitation	60.0 mm (2.4 in)	36 of 100 (Notable)
Timovskoe	Russia	Record high minimum temperature	-2.9 C (26.8 F)	36 of 100 (Notable)
Ellensburg	United States	Record high maximum temperature	12.2 C (54.0 F)	36 of 100 (Notable)
Quambone (Sandy Camp)	Australia	Record daily precipitation	26.0 mm (1.0 in)	35 of 100 (Notable)
Marrar (Centenary Drive)	Australia	Record daily precipitation	26.2 mm (1.0 in)	35 of 100 (Notable)
Olga 2 SE	United States	Record high maximum temperature	13.9 C (57.0 F)	35 of 100 (Notable)
Sunnyside	United States	Record high maximum temperature	18.9 C (66.0 F)	35 of 100 (Notable)
Morundah (Sandside)	Australia	Record daily precipitation	34.0 mm (1.3 in)	34 of 100 (Routine)
Strathgordon Village	Australia	Record daily precipitation	44.6 mm (1.8 in)	34 of 100 (Routine)

Counts by Type and Timescale

901 records

Records set or tied on 17 December 1999 by type: Highest daily maximum 97, Lowest daily maximum 96, Highest daily minimum 124, Lowest daily minimum 133, Heaviest daily rainfall 412, Heaviest daily snowfall 16, Deepest snow cover 23.

Records on 17 December 1999 by type
Record type	Records
Highest daily maximum	97
Lowest daily maximum	96
Highest daily minimum	124
Lowest daily minimum	133
Heaviest daily rainfall	412
Heaviest daily snowfall	16
Deepest snow cover	23

Records on 17 December 1999 by timescale: all-time 1, monthly 15, daily 885.

How Much Records Were Beaten By

755 broken records

Margins by which the 755 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 210.0. Ties are not counted.

Top 20 by Significance

17 December 1999

Top 20 records on 17 December 1999 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 December 1999	Nappa Merrie, AU	monthly rain	81.8 mm (3.2 in)	45.8 mm (1.8 in)	10 years	62 of 100 (Major)
17 December 1999	Grong Grong (Junee St), AU	daily rain	39.0 mm (1.5 in)	20.5 mm (0.8 in)	96 years	61 of 100 (Major)
17 December 1999	Sarajevo, BA	daily rain	69.0 mm (2.7 in)	41.1 mm (1.6 in)	36 years	59 of 100 (Notable)
17 December 1999	Koetong, AU	daily rain	61.4 mm (2.4 in)	21.3 mm (0.8 in)	96 years	56 of 100 (Notable)
17 December 1999	Wilcannia (Billilla), AU	daily rain	31.0 mm (1.2 in)	18.8 mm (0.7 in)	96 years	55 of 100 (Notable)
17 December 1999	Walwa, AU	daily rain	37.4 mm (1.5 in)	17.1 mm (0.7 in)	96 years	55 of 100 (Notable)
17 December 1999	Wantabadgery, AU	daily rain	26.0 mm (1.0 in)	13.0 mm (0.5 in)	112 years	53 of 100 (Notable)
17 December 1999	Peechelba East, AU	daily rain	72.0 mm (2.8 in)	63.0 mm (2.5 in)	18 years	52 of 100 (Notable)
17 December 1999	Coolamon Post Office, AU	daily rain	27.0 mm (1.1 in)	14.3 mm (0.6 in)	92 years	51 of 100 (Notable)
17 December 1999	Adelong Post Office, AU	daily rain	32.6 mm (1.3 in)	12.5 mm (0.5 in)	96 years	50 of 100 (Notable)
17 December 1999	Towong Upper, AU	daily rain	57.0 mm (2.2 in)	40.0 mm (1.6 in)	18 years	50 of 100 (Notable)
17 December 1999	Delmore Downs, AU	daily rain	50.0 mm (2.0 in)	47.0 mm (1.9 in)	40 years	49 of 100 (Notable)
17 December 1999	Nariel Creek (Simpson), AU	daily rain	51.8 mm (2.0 in)	21.3 mm (0.8 in)	78 years	49 of 100 (Notable)
17 December 1999	Hungerford, AU	daily rain	39.4 mm (1.6 in)	12.5 mm (0.5 in)	96 years	48 of 100 (Notable)
17 December 1999	Dartmouth Reservoir, AU	daily rain	63.8 mm (2.5 in)	23.2 mm (0.9 in)	74 years	48 of 100 (Notable)
17 December 1999	Haikou, CN	daily rain	52.7 mm (2.1 in)	40.1 mm (1.6 in)	16 years	48 of 100 (Notable)
17 December 1999	Turku Turun Lentoasema, FI	daily rain	25.7 mm (1.0 in)	14.5 mm (0.6 in)	20 years	48 of 100 (Notable)
17 December 1999	Morstone Station, AU	daily rain	66.0 mm (2.6 in)	43.4 mm (1.7 in)	48 years	47 of 100 (Notable)
17 December 1999	Fowlers Gap Research Station, AU	daily rain	25.6 mm (1.0 in)	13.4 mm (0.5 in)	92 years	47 of 100 (Notable)
17 December 1999	Kergunyah South, AU	daily rain	49.8 mm (2.0 in)	10.9 mm (0.4 in)	96 years	47 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 901 records.

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

Records on 12-17 in each year
Year	Records
1793	2
1796	1
1806	2
1808	2
1814	1
1815	1
1839	1
1845	1
1846	4
1847	1
1848	1
1859	3
1866	1
1867	1
1868	1
1869	2
1873	2
1876	3
1877	2
1878	1
1879	2
1881	2
1885	1
1886	1
1888	2
1889	2
1890	4
1892	4
1893	2
1894	4
1895	3
1896	4
1897	4
1898	2
1899	1
1900	6
1901	5
1902	47
1903	2
1904	14
1905	2
1906	17
1907	9
1908	13
1909	5
1910	37
1911	12
1912	15
1913	21
1914	17
1915	31
1916	21
1917	21
1918	21
1919	109
1920	97
1921	94
1922	120
1923	170
1924	505
1925	79
1926	172
1927	143
1928	359
1929	221
1930	362
1931	217
1932	684
1933	710
1934	200
1935	87
1936	504
1937	379
1938	118
1939	1,126
1940	248
1941	261
1942	507
1943	444
1944	189
1945	621
1946	207
1947	258
1948	316
1949	296
1950	294
1951	773
1952	277
1953	283
1954	409
1955	419
1956	448
1957	686
1958	540
1959	548
1960	492
1961	911
1962	676
1963	531
1964	1,239
1965	482
1966	516
1967	1,121
1968	338
1969	238
1970	820
1971	781
1972	601
1973	1,016
1974	390
1975	474
1976	507
1977	1,024
1978	710
1979	951
1980	1,116
1981	1,354
1982	569
1983	1,264
1984	1,618
1985	1,210
1986	743
1987	1,191
1988	481
1989	2,905
1990	866
1991	577
1992	1,461
1993	761
1994	685
1995	956
1996	1,212
1997	1,279
1998	695
1999	901
2000	1,566
2001	1,262
2002	858
2003	751
2004	554
2005	806
2006	1,307
2007	1,100
2008	1,354
2009	926
2010	1,405
2011	430
2012	942
2013	718
2014	370
2015	1,378
2016	1,521
2017	408
2018	498
2019	917
2020	768
2021	908
2022	595
2023	931
2024	560
2025	1,198

Download the Data

Data for records on 1999-12-17: 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	738
50 to 100	11
100 to 150	3
150 to 200	2
200 to 250	1