Portsmouth Rhode Island Weather Almanac
Tuesday, December 21, 2021
Clear Morning, Partly Cloudy Day to Cloudy Evening, Light Winds Late and Warmer
		Climate Normal Period								Climate Record Period
		1991 - 2020								1893 - 2021
		December 21, 2021								Record					Record
Observed Daily Data		2021		2020		Norm		Depart		Highest					Lowest
Maximum Temperature		42		35		42		+0		58		in	1999		13		in	1955
Minimum Temperature		33		30		29		+4		49		in	2018		-3		in	1955
Average Temperature		38		33		35		+3		53		in	2018		5		in	1955
Month Avg Max Temperature		48.5		42.3		44.3		+4.2		53.3		in	2015		31.6		in	1904
Month Avg Min Temperature		34.9		30.9		31.2		+3.7		40.7		in	2015		16.0		in	1989
Month Average Temperature		41.9		36.9		37.7		+4.2		47.3		in	2015		24.6		in	1989
High Heat Index
Low Wind Chill		26		28		16		+10							-25		in	1955
Heating Degree Days		27		32		29		-2		60		in	1955		12		in	2018
Month HDD		485		591		572		-87		849		in	1989		371		in	2015
Season HDD		1279		1384		1562		-283		2137		in	1904		1166		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		33		34		35		-2		57		in	2018		-12		in	1955
Minimum Dew Point		21		28		19		+2		45		in	2018		-23		in	1955
Average  Dew Point		27		31		27		+0		51		in	2018		-18		in	1955
Month Avg Max Dew Point		41.7		36.0		35.4		+6.3		47.8		in	2015		17.8		in	1989
Month Avg Min Dew Point		22.9		23.5		20.1		+2.8		35.1		in	2015		-0.4		in	1989
Month Average Dew Point		32.5		30.0		27.8		+4.7		41.6		in	2015		8.7		in	1989
Precipitation		.00		.00		.15		-.15		2.05		in	1946
One Hour		.00		.00						.59		in	1993
Hourly Rate		.00		.00						4.36		in	2012
Month Precipitation		.97		4.25		3.16		-2.19		9.27		in	1936		.27		in	1998
Year Precipitation		46.55		41.13		44.59		+1.96		63.81		in	1983		27.14		in	1965
Snow		0.0		0.0		0.2		-0.2		7.2		in	1954				in
Snow Depth		0		5						20		in	2009				in
Month Snow		0.2		7.4		3.8		-3.6		21.3		in	1981		0.0		in	2015
Season Snow		0.2		8.0		4.4		-4.2		21.3		in	1898		0.0		in	2015
		December 21, 2021								Record					Record
Observed Daily Data		2021		2020		Norm		Depart		Highest					Lowest
Maximum Humidity		84%		96%		84%		+0%		100%		in	2018		44%		in	1955
Minimum Humidity		56%		89%		58%		-2%		96%		in	1972		22%		in	1955
Average Humidity		70%		93%		71%		-1%		98%		in	1972		33%		in	1955
Maximum Barometer		30.18		29.98		30.17		+00.01		30.94		in	1983		29.42		in	1978
Minimum Barometer		29.86		29.67		29.83		+00.03		30.50		in	1983		28.95		in	1973
Average Barometer		30.02		29.83		30.00		+00.02		30.72		in	1983		29.21		in	1976
Average Wind		5.3		3.2		8.8		-3.5		18.6		in	1976		2.7		in	1956
Direction		W		NNW		WNW				WNW					SW
High Wind Gust		25		16		27		-2		48		in	1957		12		in	1983
Direction		WSW		NNE		WNW				S					NE
Maximum Water Temp		45.9		44.8		44.8		+1.1		50.2		in	2006		40.6		in	2019
Minimum Water Temp		44.2		43.9		42.2		+2.0		47.2		in	2011		37.2		in	2004
Average Water Temp		45.1		44.4		43.5		+1.5		48.4		in	2011		39.1		in	2019
Sunrise/ AM Twilight		7:08:23 AM						6:38:37 AM
Sunset / PM Twilight		4:18:17 PM						4:48:03 PM
Length Of Day		9:09:54
Special Conditions		None
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