Portsmouth Rhode Island Weather Almanac
Friday, May 30, 2025
Cloudy to Dense Fog PM, Warmer
		Climate Normal Period								Climate Record Period
		1991 - 2020								1893 - 2025
		May 30								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Temperature		68		62		70		-2		90		in	1931		49		in	2021
Minimum Temperature		58		52		53		+5		66		in	1929		39		in	1970
Average Temperature		63		57		61		+2		76		in	1942		48		in	2021
Month Avg Max Temperature		66.1		65.2		64.8		+1.3		71.4		in	1991		57.4		in	1917
Month Avg Min Temperature		51.5		50.6		48.4		+3.1		52.6		in	2012		41.9		in	1967
Month Average Temperature		59.0		58.2		56.6		+2.3		60.5		in	1991		50.5		in	1967
High Heat Index										94		in	1942
Low Wind Chill															36		in	1970
Heating Degree Days		2		8		4		-2		17		in	2021		0		in	2022
Month Heating DD		181		214		251		-70		435		in	1967		168		in	1993
Season Heating DD		4996		4945		5424		-428		6523		in	1905		4475		in	2012
Cooling Degree Days		0		0		1		-1		11		in	1942		0		in	All
Month Cooling DD		0		10		10		-10		45		in	1991		0		in	Many
Year Cooling DD		0		10		10		-10		45		in	1991		0		in	Many
Maximum Dew Point		62		60		58		+4		71		in	2011		40		in	1967
Minimum Dew Point		56		46		48		+8		61		in	2012		27		in	1961
Average  Dew Point		59		53		53		+6		66		in	2011		35		in	1967
Month Avg Max Dew Point		56.8		57.4		53.1		+3.7		57.9		in	2012		42.1		in	1967
Month Avg Min Dew Point		47.0		47.5		41.9		+5.1		48.9		in	2012		31.2		in	1967
Month Average Dew Point		52.1		52.6		47.5		+4.6		53.5		in	2012		36.7		in	1967
Precipitation		.00		.08		.10		-.10		1.12		in	2016
One Hour Rain		.00		.03						.44		in	1991
Half Hour Rain		.00		.03						.22		in	2016
Hourly Rain Rate		.00		.47						4.57		in	2016
Month Precipitation		7.36		6.24		3.21		+4.15		9.19		in	1948		.35		in	2015
Year Precipitation		20.16		29.16		18.94		+1.22		35.73		in	1983		11.62		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 30								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Humidity		99%		97%		93%		+6%		100%		in	2017		64%		in	1993
Minimum Humidity		82%		77%		57%		+25%		96%		in	2016		24%		in	1993
Average Humidity		91%		87%		75%		+16%		98%		in	2016		44%		in	1993
Maximum Barometer		29.86		30.01		30.04		-00.18		30.55		in	1970		29.64		in	2003
Minimum Barometer		29.47		29.84		29.84		-00.37		30.34		in	1970		29.30		in	1990
Average Barometer		29.67		29.93		29.94		-00.28		30.45		in	1970		29.56		in	1990
Average Wind		6.3		7.9		5.7		+0.6		13.0		in	1984		2.2		in	2012
Direction		SSW		N		SSE				SSE					WSW
High Wind Gust		20		30		20		-0		39		in	1909		11		in	2012
Direction		SSW		N		SSE				NW					WSW
Maximum Water Temp		58.3		62.2		59.9		-1.6		68.4		in	2007		55.2		in	2020
Minimum Water Temp		56.8		59.2		56.1		+0.7		61.5		in	2012		51.3		in	2005
Average Water Temp		57.6		60.7		58.1		-0.5		64.9		in	2007		53.6		in	2020
Sunrise/ AM Twilight		5:14:09 AM						4:41:03 AM
Sunset / PM Twilight		8:11:30 PM						8:44:52 PM
Length Of Day		14:57:32
Special Conditions		Dense Fog
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