Portsmouth Rhode Island Weather Almanac
Sunday, May 30, 2021
Cloudy, Rain and Fog, Breezy with Record Breaking Cold
Climate Normal Period						Climate Record Period
1991- 2020						1893 - 2021
		May 30, 2021								Record					Record
Observed Daily Data		2021		2020		Norm		Depart		Highest					Lowest
Maximum Temperature		49		80		70		-21		90		in	1931		49		in	2021
Minimum Temperature		47		59		53		-6		66		in	1929		39		in	1970
Average Temperature		48		70		61		-13		76		in	1942		48		in	2021
Month Avg Max Temperature		66.8		65.3		64.8		+2.0		71.4		in	1991		57.4		in	1917
Month Avg Min Temperature		48.8		46.9		48.4		+0.4		52.6		in	2012		41.9		in	1967
Month Average Temperature		58.1		56.4		56.6		+1.4		60.5		in	1991		50.5		in	1967
Heating Degree Days		17		0		4		+13		17		in	2021		0		in	2020
Month HDD		225		267		251		-26		435		in	1967		168		in	1993
Season HDD		5034		5088		5424		-390		6523		in	1905		4475		in	2012
Cooling Degree Days		0		5		1		-1		11		in	1942		0		in
Month CDD		17		8		10		+7		45		in	1991		0		in	2008
Year CDD		17		8		10		+7		45		in	1991		0		in	2008
Maximum Dew Point		48		68		58		-10		71		in	2011		40		in	1967
Minimum Dew Point		44		55		48		-4		61		in	2012		27		in	1961
Average  Dew Point		46		62		53		-7		66		in	2011		35		in	1967
Month Avg Max Dew Point		51.9		52.3		53.1		-1.2		57.9		in	2012		42.1		in	1967
Month Avg Min Dew Point		40.8		39.4		41.9		-1.1		48.9		in	2012		31.2		in	1967
Month Average Dew Point		46.5		46.1		47.5		-1.0		53.5		in	2012		36.7		in	1967
Precipitation		.42		.01		.10		+.32		1.12		in	2016
One Hour		.17		.01						.44		in	1991
Hourly Rate		.34		.00						4.57		in	2016
Month Precipitation		5.16		3.01		3.21		+1.95		9.19		in	1948		.35		in	2015
Year Precipitation		16.86		19.21		18.94		-2.08		35.73		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 30, 2021								Record					Record
Observed Daily Data		2021		2020		Norm		Depart		Highest					Lowest
Maximum Humidity		97%		98%		92%		+5%		100%		in	2017		64%		in	1993
Minimum Humidity		91%		59%		57%		+34%		96%		in	2016		24%		in	1993
Average Humidity		94%		79%		75%		+19%		98%		in	2016		44%		in	1993
Maximum Barometer		30.19		29.93		30.04		+00.15		30.55		in	1970		29.64		in	2003
Minimum Barometer		30.12		29.81		29.84		+00.28		30.34		in	1970		29.30		in	1990
Average Barometer		30.16		29.87		29.94		+00.22		30.45		in	1970		29.56		in	1990
Average Wind		9.1		5.8		5.7		+3.4		13.0		in	1984		2.2		in	2012
Direction		NE		SSW		SSE				SSE					WSW
High Wind Gust		26		18		20		+6		39		in	1909		11		in	2012
Direction		ENE		SSW		SSE				NW					WSW
High Heat Index				81						94		in	1942
Wind Chill		42													36		in	1970
Maximum Water Temp		55.4		55.2		59.7		-4.3		68.4		in	2007		55.2		in	2020
Minimum Water Temp		54.5		52.0		55.7		-1.2		61.5		in	2012		51.3		in	2005
Average Water Temp		55.0		53.6		57.7		-2.8		64.9		in	2007		53.6		in	2020
Sunrise/ AM Twilight		5:14:07 AM						4:41:03 AM
Sunset / PM Twilight		8:11:48 PM						8:44:52 PM
Length Of Day		14:57:41
Special Conditions		Fog
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