Portsmouth Rhode Island Weather Almanac
Wednesday, December 15, 2021
Clear early, Partly Cloudy Day to Cloudy, Very Light Rain PM, Mild
		Climate Normal Period								Climate Record Period
		1991 - 2020								1893 - 2021
		December 15, 2021								Record					Record
Observed Daily Data		2021		2020		Norm		Depart		Highest					Lowest
Maximum Temperature		52		36		44		+8		61		in	2015		24		in	2010
Minimum Temperature		31		26		30		+1		48		in	2015		9		in	1900
Average Temperature		42		31		37		+5		55		in	2015		18		in	1900
Month Avg Max Temperature		49.5		46.3		45.0		+4.5		54.8		in	2015		30.1		in	1904
Month Avg Min Temperature		34.9		34.1		31.9		+2.9		42.3		in	2015		16.1		in	1989
Month Average Temperature		42.5		40.5		38.4		+4.1		48.9		in	2015		24.6		in	1904
High Heat Index
Low Wind Chill		28		21		19		+9							-4		in	1980
Heating Degree Days		23		34		28		-5		47		in	1900		10		in	2015
Month HDD		338		368		398		-60		606		in	1904		242		in	2015
Season HDD		1132		1161		1388		-256		1918		in	1904		1037		in	2015
Cooling Degree Days		0		0		0		+0				in					in
Month CDD		0		0		0		+0		0		in					in
Year Cooling Degree Days		795		871		609		+186		871		in	2020		290		in	1902
Maximum Dew Point		47		30		36		+11		60		in	2015		10		in	2010
Minimum Dew Point		15		6		21		-6		43		in	2008		-5		in	2016
Average  Dew Point		31		18		28		+3		50		in	2015		4		in	1961
Month Avg Max Dew Point		41.9		39.3		36.3		+5.5		49.1		in	2015		18.0		in	1989
Month Avg Min Dew Point		22.7		26.6		21.3		+1.4		38.0		in	2015		-1.5		in	1989
Month Average Dew Point		32.5		33.1		28.8		+3.7		43.7		in	2015		8.3		in	1989
Precipitation		.01		.00		.15		-.14		1.79		in	1981
One Hour		.01		.00						.60		in	1987
Hourly Rate		.00		.00						.42		in	2013
Month Precipitation		.69		3.47		2.26		-1.57		6.64		in	1936		.20		in	1998
Year Precipitation		46.27		40.35		43.69		+2.58		63.81		in	1983		27.09		in	1965
Snow		0.0		0.0		0.2		-0.2		7.1		in	1905				in
Snow Depth		0		0						11		in	1904				in
Month Snow		0.2		T		2.6		-2.4		19.9		in	1981		0.0		in	2015
Season Snow		0.2		0.6		3.2		-3.0		21.1		in	1898		0.0		in	2015
		December 15, 2021								Record					Record
Observed Daily Data		2021		2020		Norm		Depart		Highest					Lowest
Maximum Humidity		85%		85%		86%		-1%		100%		in	2018		49%		in	1961
Minimum Humidity		42%		31%		57%		-15%		96%		in	1993		17%		in	1959
Average Humidity		64%		58%		71%		-8%		98%		in	1993		42%		in	1961
Maximum Barometer		30.70		30.38		30.14		+00.56		30.70		in	2021		29.24		in	1954
Minimum Barometer		30.26		29.91		29.80		+00.46		30.46		in	1994		29.05		in	1968
Average Barometer		30.48		30.15		29.97		+00.51		30.51		in	1994		29.16		in	1954
Average Wind		5.8		10.0		8.7		-2.9		19.1		in	1961		2.6		in	2014
Direction		SSE		NW		WNW				NNW					WNW
High Wind Gust		25		27		27		-2		53		in	1953		11		in	1992
Direction		S		WNW		WNW				WSW					WSW
Maximum Water Temp		48.2		48.9		46.2		+2.0		51.9		in	2015		41.5		in	1997
Minimum Water Temp		46.2		45.5		43.6		+2.6		50.7		in	2015		38.7		in	2010
Average Water Temp		47.2		47.2		44.9		+2.3		51.3		in	2015		40.1		in	1997
Sunrise/ AM Twilight		7:03:13 AM						6:33:30 AM
Sunset / PM Twilight		4:17:56 PM						4:47:38 PM
Length Of Day		9:14:43
Special Conditions		None
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