Portsmouth Rhode Island Weather Almanac
Saturday, December 18, 2021
Mostly Cloudy early then Cloudy, Light Rain and Fog, Light Winds and Cooler
		Climate Normal Period								Climate Record Period
		1991 - 2020								1893 - 2021
		December 18, 2021								Record					Record
Observed Daily Data		2021		2020		Norm		Depart		Highest					Lowest
Maximum Temperature		43		29		43		+0		60		in	1984		11		in	1919
Minimum Temperature		37		22		29		+8		47		in	1996		-3		in	1919
Average Temperature		40		26		36		+4		50		in	2012		4		in	1919
Month Avg Max Temperature		50.1		43.7		44.7		+5.4		54.6		in	2015		30.7		in	1904
Month Avg Min Temperature		36.4		32.0		31.6		+4.8		41.8		in	2015		16.4		in	1989
Month Average Temperature		43.4		38.1		38.0		+5.4		48.5		in	2015		25.1		in	1904
High Heat Index
Low Wind Chill		33		12		15		+18							-15		in	1919
Heating Degree Days		25		39		29		-4		61		in	1919		15		in	2012
Month HDD		388		485		485		-97		719		in	1904		297		in	2015
Season HDD		1182		1278		1475		-293		2031		in	1904		1092		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		41		20		35		+6		54		in	2016		4		in	2009
Minimum Dew Point		25		13		20		+5		47		in	1996		-10		in	1979
Average  Dew Point		33		17		28		+5		50		in	1996		-1		in	1979
Month Avg Max Dew Point		42.9		37.2		35.9		+7.1		49.3		in	2015		18.1		in	1989
Month Avg Min Dew Point		24.0		24.1		20.7		+3.3		37.4		in	2015		-0.4		in	1989
Month Average Dew Point		33.7		30.8		28.3		+5.4		43.6		in	2015		8.8		in	1989
Precipitation		.16		.00		.15		+.01		1.46		in	1954
One Hour		.03		.00						.44		in	1954
Hourly Rate		.05		.00						.57		in	2012
Month Precipitation		.87		4.23		2.71		-1.84		7.74		in	1936		.27		in	1998
Year Precipitation		46.45		41.11		44.14		+2.31		63.81		in	1983		27.14		in	1965
Snow		0.0		0.0		0.2		-0.2		6.6		in	1904				in
Snow Depth		0		7						12		in	1904				in
Month Snow		0.2		7.4		3.2		-3.0		21.3		in	1981		0.0		in	2015
Season Snow		0.2		8.0		3.8		-3.6		21.3		in	1981		0.0		in	2015
		December 18, 2021								Record					Record
Observed Daily Data		2021		2020		Norm		Depart		Highest					Lowest
Maximum Humidity		98%		88%		85%		+13%		100%		in	2017		51%		in	1978
Minimum Humidity		51%		56%		54%		-3%		96%		in	1996		26%		in	2002
Average Humidity		75%		72%		69%		+5%		98%		in	1996		43%		in	1978
Maximum Barometer		30.20		30.31		30.14		+00.06		30.59		in	1957		29.59		in	2001
Minimum Barometer		29.76		30.08		29.80		-00.04		30.38		in	1957		29.14		in	2001
Average Barometer		29.98		30.20		29.97		+00.01		30.49		in	1957		29.37		in	2001
Average Wind		4.6		8.2		8.5		-3.9		20.4		in	2018		1.5		in	1967
Direction		NE		NNW		WNW				NW					ESE
High Wind Gust		15		23		27		-12		52		in	1956		9		in	1967
Direction		NNE		NNW		WNW				WNW					ESE
Maximum Water Temp		49.5		45.3		45.7		+3.8		51.5		in	2011		39.9		in	2007
Minimum Water Temp		47.8		43.2		43.4		+4.4		50.2		in	2015		37.5		in	2007
Average Water Temp		48.7		44.3		44.5		+4.1		50.4		in	2015		38.7		in	2007
Sunrise/ AM Twilight		7:06:43 AM						6:36:58 AM
Sunset / PM Twilight		4:16:56 PM						4:46:41 PM
Length Of Day		9:10:13
Special Conditions		Fog
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