Portsmouth Rhode Island Weather Almanac
Wednesday, December 18, 2019
Cloudy, Light Snow & Fog early then Partly Cloudy, Windy and Colder
Climate Normal Period						Climate Record Period
1981- 2010						1893 - 2019
		December 18, 2019								Record					Record
Observed Daily Data		Observed		2018		Normal		Depart		Highest					Lowest
Maximum Temperature		37		38		41		-4		60		in	1984		11		in	1919
Minimum Temperature		22		24		27		-5		47		in	1996		-3		in	1919
Average Temperature		30		31		34		-4		50		in	2012		4		in	1919
Precipitation		.01		.00		.14		-.13		1.46		in	1954
One Hour		.00		.00						.44		in	1954
Snow		0.1		0.0		0.1		-.04		6.6		in	1904
Snow Depth		T		0						12		in	1904
HDD		35		34		31		+4		61		in	1919		15		in	2012
CDD		0		0		0		+0		0		in
Maximum Dew Point		29		30		33		-4		54		in	2016		4		in	2009
Minimum Dew Point		11		10		17		-6		47		in	1996		-10		in	1979
Average  Dew Point		20		20		25		-5		50		in	1996		-1		in	1979
Maximum Humidity		95%		72%		84%		+11%		100%		in	2017		51%		in	1978
Minimum Humidity		62%		42%		54%		+8%		96%		in	1996		26%		in	2002
Average Humidity		79%		57%		69%		+9%		98%		in	1996		43%		in	1978
Maximum Barometer		29.87		30.05		30.14		-00.27		30.59		in	1957		29.59		in	2001
Minimum Barometer		29.62		29.59		29.79		-00.17		30.38		in	1957		29.14		in	2001
Average Barometer		29.75		29.82		29.97		-00.22		30.49		in	1957		29.37		in	2001
Average Wind		12.4		20.4		8.6		+3.8		20.4		in	2018		1.5		in	1967
Direction		WNW		NW		WNW				NW					ESE
High Wind Gust		33		47		27		+6		52		in	1956		9		in	1967
Direction		WNW		NW		WNW				WNW					ESE
Wind Chill		8		10		15		-7							-8		in	1979
Maximum Water Temp		41.3		42.6		45.5		-4.2		51.5		in	2011		39.9		in	2007
Minimum Water Temp		39.1		38.7		43.2		-4.1		50.2		in	2015		37.5		in	2007
Average Water Temp		40.2		40.7		44.4		-4.2		50.4		in	2015		38.7		in	2007
Sunrise/ AM Twilight		7:06:58 AM						6:35:39 AM
Sunset / PM Twilight		4:17:33 PM						4:48:52 PM
Length Of Day		9:10:35
Special Conditions		Fog
Comments
		December 18, 2019								Record					Record
Month-to-Date Summary		Observed		2018		Normal		Depart		Highest					Lowest
Avg Maximum Temperature		42.9		42.0		43.9		-0.9		54.6		in	2015		30.7		in	1904
Avg Minimum Temperature		29.8		29.2		30.2		-0.4		41.8		in	2015		16.4		in	1989
Average Temperature		36.4		35.6		37.0		-0.6		48.2		in	2015		24.9		in	1904
Total Precipitation		5.28		1.95		2.63		+2.65		7.74		in	1936		.27		in	1998
Total Snow		8.4		T		3.7		+4.7		21.3		in	1981		0.0		in	2015
Total HDD		510		524		499		+11		719		in	1904		297		in	2015
Total CDD		0		0		0		+0		0		in			0		in
Avg Maximum Dew Point		37.9		33.8		35.9		+2.0		49.3		in	2015		18.1		in	1989
Avg Minimum Dew Point		22.1		19.7		20.7		+1.3		37.4		in	2015		-0.4		in	1989
Average  Dew Point		30.0		26.8		28.3		+1.7		43.4		in	2015		8.8		in	1989
		December 18, 2019								Record					Record
Year-to-Date Summary		Observed		2018		Normal		Depart		Highest					Lowest
Total Precipitation		54.78		51.18		46.48		+8.30		63.81		in	1983		27.14		in	1965
Total Snow (since Jul 1 19)		8.4		4.2		4.8		+3.6		21.3		in	1981		0.0		in	2015
Total HDD (since Jul 1 19)		1500		1584		1531		-31		2031		in	1904		1092		in	2015
Total CDD (since Jan 1)		731		775		563		+168		807		in	2016		290		in	1902
Hour-by-Hour Weather For December 18, 2019
Climate Weather for December 18
Weather History For December 18
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