Portsmouth Rhode Island Weather Almanac
Saturday, May 29, 2021
Cloudy, Heavy Rain & Fog, Windy, Record Breaking Cold
Climate Normal Period						Climate Record Period
1991- 2020						1893 - 2021
		May 29, 2021								Record					Record
Observed Daily Data		2021		2020		Norm		Depart		Highest					Lowest
Maximum Temperature		48		66		69		-21		90		in	1931		48		in	2021
Minimum Temperature		44		60		52		-8		64		in	2016		40		in	1900
Average Temperature		46		63		61		-15		75		in	1931		46		in	2021
Month Avg Max Temperature		67.4		64.8		64.7		+2.8		71.2		in	1991		57.4		in	1917
Month Avg Min Temperature		48.9		46.4		48.2		+0.7		52.2		in	2012		41.8		in	1967
Month Average Temperature		58.4		55.9		56.5		+1.9		60.2		in	1991		50.3		in	1967
Heating Degree Days		19		2		4		+15		19		in	2021		0		in	2018
Month HDD		208		267		247		-39		426		in	1967		164		in	1918
Season HDD		5017		5088		5420		-403		6518		in	1905		4475		in	2012
Cooling Degree Days		0		0		1		-1		10		in	1931		0		in
Month CDD		17		3		9		+8		41		in	1991		0		in	2013
Year CDD		17		3		9		+8		41		in	1991		0		in	2013
Maximum Dew Point		45		64		58		-13		70		in	2018		40		in	1964
Minimum Dew Point		42		60		47		-5		62		in	2011		31		in	2004
Average  Dew Point		44		62		53		-9		65		in	2011		38		in	1964
Month Avg Max Dew Point		52.0		51.8		52.9		-0.9		57.6		in	2004		42.2		in	1967
Month Avg Min Dew Point		40.7		38.9		41.7		-1.0		48.4		in	2012		31.3		in	1967
Month Average Dew Point		46.5		45.5		47.3		-0.8		53.1		in	2012		36.7		in	1967
Precipitation		1.74		.21		.10		+1.64		1.74		in	2021
One Hour		.40		.13						.47		in	1982
Hourly Rate		1.08		1.78						2.45		in	2013
Month Precipitation		4.74		3.00		3.11		+1.63		9.19		in	1948		.35		in	2015
Year Precipitation		16.44		19.20		18.84		-2.40		35.09		in	1983		11.43		in	1905
Snow		0.0		0.0		0.0		+0.0		0.0		in
Snow Depth		0		0								in
Month Snow		0.0		0.0		0.0		+0.0		1.7		in	1977		0.0		in
Season Snow		27.7		12.9		33.5		-5.8		84.1		in	1996		5.0		in	1998
		May 29, 2021								Record					Record
Observed Daily Data		2021		2020		Norm		Depart		Highest					Lowest
Maximum Humidity		95%		97%		91%		+4%		100%		in	2011		60%		in	1975
Minimum Humidity		90%		93%		58%		+32%		93%		in	2020		28%		in	1989
Average Humidity		93%		95%		75%		+18%		95%		in	2020		47%		in	1975
Maximum Barometer		30.17		30.12		30.06		+00.11		30.57		in	1970		29.67		in	2003
Minimum Barometer		29.90		29.93		29.85		+00.05		30.40		in	1970		29.44		in	1990
Average Barometer		30.04		30.03		29.96		+00.08		30.49		in	1970		29.60		in	1969
Average Wind		11.7		9.9		6.3		+5.4		12.3		in	1968		2.0		in	1996
Direction		NE		SSW		SSW				SE					ESE
High Wind Gust		31		23		22		+9		37		in	1984		10		in	2009
Direction		NE		SSW		SSW				S					SE
High Heat Index										89		in	1931
Wind Chill		36													36		in	2021
Maximum Water Temp		57.6		53.6		59.5		-1.9		67.8		in	2007		53.6		in	2020
Minimum Water Temp		54.9		52.0		55.6		-0.7		61.3		in	2012		51.3		in	2005
Average Water Temp		56.3		52.8		57.6		-1.3		63.8		in	2012		52.8		in	2020
Sunrise/ AM Twilight		5:14:37 AM						4:41:37 AM
Sunset / PM Twilight		8:11:01 PM						8:44:00 PM
Length Of Day		14:56:24
Special Conditions		Fog
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