Portsmouth Rhode Island Weather Almanac
Thursday, May 29, 2025
Cloudy, Rain and Fog, Light Winds, Cooler
		Climate Normal Period								Climate Record Period
		1991 - 2020								1893 - 2025
		May 29								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Temperature		63		74		69		-6		90		in	1931		48		in	2021
Minimum Temperature		52		59		52		+0		64		in	2016		40		in	1900
Average Temperature		58		67		61		-3		75		in	1931		46		in	2021
Month Avg Max Temperature		66.1		65.3		64.7		+1.4		71.2		in	1991		57.4		in	1917
Month Avg Min Temperature		51.2		50.6		48.2		+3.0		52.2		in	2012		41.8		in	1967
Month Average Temperature		58.8		58.2		56.5		+2.3		60.2		in	1991		50.3		in	1967
High Heat Index		0		58						89		in	1931
Low Wind Chill		0		0											36		in	2021
Heating Degree Days		7		0		4		+3		19		in	2021		0		in	2024
Month Heating DD		179		206		247		-68		426		in	1967		164		in	1918
Season Heating DD		4994		4937		5420		-426		6518		in	1905		4475		in	2012
Cooling Degree Days		0		2		1		-1		10		in	1931		0		in	All
Month Cooling DD		0		10		9		-9		41		in	1991		0		in	Many
Year Cooling DD		0		10		9		-9		41		in	1991		0		in	Many
Maximum Dew Point		61		61		58		+3		70		in	2018		40		in	1964
Minimum Dew Point		49		56		47		+2		62		in	2011		31		in	2004
Average  Dew Point		55		59		53		+2		65		in	2012		38		in	1964
Month Avg Max Dew Point		56.6		57.3		52.9		+3.7		57.6		in	2004		42.2		in	1967
Month Avg Min Dew Point		46.7		47.5		41.7		+5.0		48.4		in	2012		31.3		in	1967
Month Average Dew Point		51.9		52.6		47.3		+4.5		53.1		in	2012		36.7		in	1967
Precipitation		.13		.00		.10		+.03		1.74		in	2021
One Hour Rain		.03		.00						.47		in	1982
Half Hour Rain		.03		.00						.25		in	2005
Hourly Rain Rate		.06		.00						2.45		in	2013
Month Precipitation		7.36		6.16		3.11		+4.25		9.19		in	1948		.35		in	2015
Year Precipitation		20.16		29.08		18.84		+1.32		35.09		in	1983		11.43		in	1905
Snow		0.0		0.0		0.0		+0.0		0.0		in			0.0		in	Many
Snow Depth		0		0		0				0		in			0		in	Many
Month Snow		0.0		0.0		T				1.7		in	1977		0.0		in	Many
Season Snow		11.9		12.7		33.8		21.9		84.1		in	1996		5.0		in	1998
		May 29								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Humidity		98%		92%		91%		+7%		100%		in	2011		60%		in	1975
Minimum Humidity		88%		60%		58%		+30%		93%		in	2020		28%		in	1989
Average Humidity		93%		76%		74%		+19%		95%		in	2020		47%		in	1975
Maximum Barometer		30.21		29.91		30.06		+00.15		30.57		in	1970		29.67		in	2003
Minimum Barometer		29.86		29.79		29.85		+00.01		30.40		in	1970		29.44		in	1990
Average Barometer		30.04		29.85		29.96		+00.08		30.49		in	1970		29.60		in	1969
Average Wind		4.7		6.1		6.3		-1.6		12.3		in	1968		2.0		in	1996
Direction		E		S		SSW				SE					ESE
High Wind Gust		17		18		22		-5		37		in	1984		10		in	2009
Direction		SSE		NW		SSW				S					SE
Maximum Water Temp		57.7		63.3		59.7		-2.0		67.8		in	2007		53.6		in	2020
Minimum Water Temp		56.1		58.8		55.9		+0.2		61.3		in	2012		51.3		in	2005
Average Water Temp		56.9		61.1		57.8		-0.9		63.8		in	2012		52.8		in	2020
Sunrise/ AM Twilight		5:14:40 AM						4:41:37 AM
Sunset / PM Twilight		8:10:42 PM						8:44:00 PM
Length Of Day		14:56:14
Special Conditions		Fog
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