Portsmouth Rhode Island Weather Almanac
Sunday, May 18, 2025
Partly Cloudy, Light Rain early then Cloudy PM, Breezy, Continued Warm
		Climate Normal Period								Climate Record Period
		1991 - 2020								1893 - 2025
		May 18								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Temperature		72		57		66		+6		82		in	2017		45		in	2007
Minimum Temperature		57		52		49		+8		62		in	2017		35		in	1983
Average Temperature		65		55		57		+8		72		in	2017		44		in	2007
Month Avg Max Temperature		68.5		61.7		62.8		+5.7		69.7		in	1993		54.1		in	1917
Month Avg Min Temperature		53.0		47.6		46.6		+6.4		53.0		in	2025		40.4		in	1967
Month Average Temperature		60.9		54.9		54.7		+6.2		60.9		in	2025		47.8		in	1917
High Heat Index										83		in	2017
Low Wind Chill															33		in	1981
Heating Degree Days		0		10		8		-8		21		in	2007		0		in	2025
Month Heating DD		74		182		185		-111		310		in	1917		74		in	2025
Season Heating DD		4889		4913		5358		-469		6439		in	1905		4454		in	2012
Cooling Degree Days		0		0		0		+0		7		in	2017		0		in	All
Month Cooling DD		0		0		0		+0		27		in	2001		0		in	Many
Year Cooling DD		0		0		0		+0		27		in	2001		0		in	Many
Maximum Dew Point		60		56		54		+6		67		in	2017		33		in	1981
Minimum Dew Point		53		48		43		+10		57		in	2017		20		in	2023
Average  Dew Point		57		52		48		+9		62		in	2017		29		in	1981
Month Avg Max Dew Point		59.4		51.4		51.0		+8.4		59.4		in	2025		41.0		in	1966
Month Avg Min Dew Point		48.3		40.0		39.5		+8.8		48.3		in	2025		28.8		in	1966
Month Average Dew Point		54.2		46.0		45.2		+8.9		54.2		in	2025		34.9		in	1966
Precipitation		.05		.14		.10		-.05		1.93		in	2002
One Hour Rain		.05		.09						.40		in	1970
Half Hour Rain		.05		.05						.13		in	2010
Hourly Rain Rate		.19		.30						.82		in	2004
Month Precipitation		4.51		5.03		2.01		+2.50		6.51		in	2006		.02		in	2015
Year Precipitation		17.31		27.95		17.74		-.43		33.69		in	1983		10.69		in	1927
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 18								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Humidity		94%		97%		91%		+3%		100%		in	2018		63%		in	1981
Minimum Humidity		62%		83%		56%		+6%		91%		in	2004		25%		in	1983
Average Humidity		78%		90%		73%		+5%		96%		in	2004		45%		in	1981
Maximum Barometer		29.54		30.01		30.08		-00.54		30.50		in	1983		29.48		in	2008
Minimum Barometer		29.47		29.94		29.87		-00.40		30.34		in	2003		29.05		in	1985
Average Barometer		29.51		29.98		29.97		-00.47		30.37		in	2003		29.27		in	1985
Average Wind		8.6		12.3		6.3		+2.3		14.6		in	2000		1.9		in	1995
Direction		WNW		NNE		NNE				S					SSE
High Wind Gust		26		26		22		+4		41		in	2000		11		in	1995
Direction		WNW		NNE		SSE				SW					NW
Maximum Water Temp		60.4		56.3		55.8		+4.6		60.4		in	2025		50.5		in	2020
Minimum Water Temp		57.7		54.3		52.8		+4.9		57.7		in	2025		45.9		in	2020
Average Water Temp		59.1		55.3		54.3		+4.8		59.1		in	2025		48.2		in	2020
Sunrise/ AM Twilight		5:22:29 AM						4:50:13 AM
Sunset / PM Twilight		8:00:54 PM						8:33:15 PM
Length Of Day		14:38:39
Special Conditions		None
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