Portsmouth Rhode Island Weather Almanac
Monday, May 31, 2021
Cloudy, Rain and Fog early, Partly Cloudy Evening, Continued Cold
Climate Normal Period						Climate Record Period
1991- 2020						1893 - 2021
		May 31, 2021								Record					Record
Observed Daily Data		2021		2020		Norm		Depart		Highest					Lowest
Maximum Temperature		59		69		70		-11		90		in	1895		57		in	1912
Minimum Temperature		49		53		53		-4		67		in	1987		37		in	1961
Average Temperature		54		61		62		-8		78		in	1929		50		in	1961
Month Avg Max Temperature		66.6		65.4		65.0		+1.6		71.4		in	1991		57.7		in	1917
Month Avg Min Temperature		48.8		47.1		48.5		+0.3		52.8		in	2012		42.0		in	1967
Month Average Temperature		57.9		56.5		56.8		+1.1		60.7		in	1991		50.6		in	1967
Heating Degree Days		11		4		4		+7		15		in	1961		0		in	2019
Month HDD		236		271		255		-19		445		in	1967		169		in	2010
Season HDD		5045		5092		5428		-383		6528		in	1905		4475		in	2012
Cooling Degree Days		0		0		1		-1		13		in	1929		0		in
Month CDD		17		8		11		+6		46		in	1991		0		in	2008
Year CDD		17		8		11		+6		46		in	1991		0		in	2008
Maximum Dew Point		54		55		59		-5		70		in	2013		38		in	1967
Minimum Dew Point		48		34		48		+0		61		in	2016		27		in	1967
Average  Dew Point		51		45		53		-2		65		in	2016		33		in	1967
Month Avg Max Dew Point		51.9		52.4		53.3		-1.4		58.1		in	2012		42.0		in	1967
Month Avg Min Dew Point		41.0		39.2		42.1		-1.1		49.0		in	2012		31.1		in	1967
Month Average Dew Point		46.6		46.0		47.7		-1.1		53.7		in	2012		36.5		in	1967
Precipitation		.14		.00		.10		+.04		4.87		in	1984
One Hour		.05		.00						.57		in	1984
Hourly Rate		.59		.00						3.02		in	2017
Month Precipitation		5.30		3.01		3.31		+1.99		9.19		in	1948		.35		in	2015
Year Precipitation		17.00		19.21		19.04		-2.04		35.75		in	1983		11.62		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 31, 2021								Record					Record
Observed Daily Data		2021		2020		Norm		Depart		Highest					Lowest
Maximum Humidity		97%		73%		92%		+5%		100%		in	2018		43%		in	1954
Minimum Humidity		81%		33%		57%		+24%		95%		in	1984		23%		in	1954
Average Humidity		89%		53%		75%		+14%		98%		in	1984		33%		in	1954
Maximum Barometer		30.20		30.14		30.02		+00.18		30.48		in	1902		29.70		in	2003
Minimum Barometer		30.07		29.85		29.81		+00.26		30.14		in	1957		29.40		in	1991
Average Barometer		30.14		30.00		29.91		+00.22		30.20		in	1957		29.62		in	1983
Average Wind		6.0		12.4		5.9		+0.1		12.4		in	2020		1.8		in	1991
Direction		NNE		NW		SE				NW					SSE
High Wind Gust		18		24		21		-3		33		in	1962		13		in	2017
Direction		NNE		N		S				SW					SSE
High Heat Index										95		in	1929
Wind Chill		45													34		in	1961
Maximum Water Temp		55.8		54.1		60.2		-4.4		66.7		in	2007		54.1		in	2020
Minimum Water Temp		54.7		50.2		56.1		-1.4		62.1		in	2012		50.2		in	2020
Average Water Temp		55.3		52.2		58.2		-3.0		63.8		in	2012		52.2		in	2020
Sunrise/ AM Twilight		5:13:40 AM						4:40:31 AM
Sunset / PM Twilight		8:12:34 PM						8:45:43 PM
Length Of Day		14:58:54
Special Conditions		Fog
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