Portsmouth Rhode Island Weather Almanac
Thursday, December 9, 2021
Mostly Cloudy, Light Snow & Fog early, P Cloudy Day to Mostly Cloudy PM, Breezy and Cold
		Climate Normal Period								Climate Record Period
		1991 - 2020								1893 - 2021
		December 9, 2021								Record					Record
Observed Daily Data		2021		2020		Norm		Depart		Highest					Lowest
Maximum Temperature		37		38		45		-8		65		in	1991		12		in	1902
Minimum Temperature		28		25		32		-4		47		in	1923		-4		in	1902
Average Temperature		33		32		38		-5		55		in	1991		4		in	1902
Month Avg Max Temperature		47.0		44.9		45.8		+1.2		56.3		in	1998		32.8		in	1910
Month Avg Min Temperature		34.6		33.8		32.8		+1.8		43.3		in	1998		14.8		in	1989
Month Average Temperature		41.0		39.6		39.1		+1.9		50.0		in	1998		25.0		in	1989
High Heat Index
Low Wind Chill		17		18		20		-3							-12		in	1902
Heating Degree Days		32		33		27		+5		61		in	1902		10		in	1991
Month HDD		216		229		233		-17		360		in	1989		135		in	1998
Season HDD		1010		1022		1223		-213		1646		in	1904		947		in	2011
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		31		31		37		-6		57		in	2019		6		in	1989
Minimum Dew Point		20		20		23		-3		43		in	1966		-10		in	1968
Average  Dew Point		26		26		30		-4		48		in	2019		-1		in	1989
Month Avg Max Dew Point		39.4		37.2		37.4		+2.1		48.3		in	1982		19.2		in	1989
Month Avg Min Dew Point		23.3		25.6		22.6		+0.8		35.6		in	2001		-3.8		in	1989
Month Average Dew Point		31.7		31.7		30.0		+1.7		41.4		in	2001		7.7		in	1989
Precipitation		.01		.00		.15		-.14		1.94		in	2019
One Hour		.00		.00						.32		in	2009
Hourly Rate		.00		.00						1.48		in	2019
Month Precipitation		.41		2.53		1.35		-.94		4.37		in	1996		.00		in	1988
Year Precipitation		45.99		39.41		42.78		+3.21		61.79		in	1983		25.40		in	1957
Snow		0.1		0.0		0.2		-0.1		2.7		in	1958				in
Snow Depth		T		0						13		in	1981				in
Month Snow		0.2		T		1.4		-1.2		17.0		in	1981		0.0		in	2015
Season Snow		0.2		0.6		2.0		-1.8		19.5		in	1898		0.0		in	2015
		December 9, 2021								Record					Record
Observed Daily Data		2021		2020		Norm		Depart		Highest					Lowest
Maximum Humidity		98%		83%		88%		+10%		100%		in	2013		52%		in	1989
Minimum Humidity		54%		67%		57%		-3%		96%		in	2014		23%		in	1989
Average Humidity		76%		75%		73%		+3%		98%		in	2014		38%		in	1989
Maximum Barometer		30.28		29.83		30.21		+00.07		30.74		in	1936		29.43		in	1981
Minimum Barometer		29.86		29.70		29.86		+00.00		30.31		in	2007		29.18		in	2009
Average Barometer		30.07		29.77		30.03		+00.04		30.44		in	2002		29.36		in	1981
Average Wind		8.8		5.3		7.2		+1.6		13.5		in	1981		0.7		in	1997
Direction		NW		WNW		WNW				NW					NNW
High Wind Gust		25		17		25		-0		62		in	2005		7		in	1997
Direction		NNW		NW		NNW				NNW					NW
Maximum Water Temp		49.8		46.6		47.1		+2.7		52.2		in	2011		42.2		in	2010
Minimum Water Temp		47.8		44.6		44.2		+3.6		50.1		in	2011		38.9		in	2002
Average Water Temp		48.8		45.6		45.7		+3.1		51.2		in	2011		41.0		in	2010
Sunrise/ AM Twilight		6:58:34 AM						6:29:01 AM
Sunset / PM Twilight		4:16:57 PM						4:46:31 PM
Length Of Day		9:18:23
Special Conditions		Fog
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