Portsmouth Rhode Island Weather Almanac
Monday, May 12, 2025
Clear to Partly Cloudy PM, Cooler
		Climate Normal Period								Climate Record Period
		1991 - 2020								1893 - 2025
		May 12, 2025								Record					Record
Observed Daily Data		2025		2025		Norm		Depart		Highest					Lowest
Maximum Temperature		65		57		64		+1		80		in	2004		47		in	1949
Minimum Temperature		43		39		47		-4		59		in	2004		36		in	1907
Average Temperature		54		48		55		-1		70		in	2004		45		in	2010
Month Avg Max Temperature		67.1		60.9		61.8		+5.2		73.3		in	2001		51.2		in	1917
Month Avg Min Temperature		51.3		45.3		45.8		+5.5		51.3		in	2025		39.2		in	1917
Month Average Temperature		59.3		53.4		53.8		+5.4		61.6		in	1930		45.4		in	1917
High Heat Index										81		in	2004
Low Wind Chill		43		39											33		in	2020
Heating Degree Days		11		17		10		+1		20		in	2010		0		in	2023
Month Heating DD		69		139		134		-65		235		in	1917		53		in	1930
Season Heating DD		4884		4870		5307		-423		6367		in	1905		4427		in	2012
Cooling Degree Days		0		0		0		+0		5		in	2004		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		53		47		52		+1		66		in	2015		37		in	1950
Minimum Dew Point		32		35		40		-8		54		in	2004		21		in	2005
Average  Dew Point		43		41		46		-3		59		in	2015		32		in	1963
Month Avg Max Dew Point		58.0		51.9		50.0		+8.0		58.0		in	2025		39.4		in	1952
Month Avg Min Dew Point		46.2		41.7		38.3		+7.8		47.7		in	1998		27.0		in	1966
Month Average Dew Point		52.4		47.1		44.2		+8.3		52.4		in	2025		33.3		in	1966
Precipitation		.00		.03		.11		-.11		1.60		in	1968
One Hour Rain		.00		.02						.44		in	1952
Half Hour Rain		.00		.01						.15		in	2019
Hourly Rain Rate		.00		.05						.65		in	2006
Month Precipitation		2.90		1.67		1.39		+1.51		4.93		in	1989		T		in	2001
Year Precipitation		15.70		24.59		17.12		-1.42		31.68		in	1983		10.18		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 12, 2025								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Humidity		92%		95%		89%		+3%		100%		in	2013		55%		in	1950
Minimum Humidity		35%		70%		52%		-17%		90%		in	2006		22%		in	2005
Average Humidity		64%		83%		70%		-7%		95%		in	2006		43%		in	1977
Maximum Barometer		30.38		29.98		30.05		+00.33		30.46		in	1990		29.58		in	2003
Minimum Barometer		30.14		29.88		29.82		+00.32		30.25		in	2022		29.41		in	1996
Average Barometer		30.26		29.93		29.93		+00.33		30.30		in	2022		29.53		in	2003
Average Wind		6.8		4.2		7.2		-0.4		18.4		in	1986		2.6		in	2009
Direction		S		S		S				N					SSE
High Wind Gust		24		21		24		+0		53		in	1986		12		in	2009
Direction		SSW		SSW		SSW				N					SSE
Maximum Water Temp		58.5		54.0		54.6		+3.9		59.6		in	2004		45.0		in	2020
Minimum Water Temp		56.1		52.0		50.8		+5.3		56.1		in	2025		42.8		in	2020
Average Water Temp		57.3		53.0		52.7		+4.6		57.4		in	2023		43.9		in	2020
Sunrise/ AM Twilight		5:28:16 AM						4:56:30 AM
Sunset / PM Twilight		7:54:55 PM						8:26:41 PM
Length Of Day		14:26:54
Special Conditions		None
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