Portsmouth Rhode Island Weather Almanac
Saturday, May 17, 2025
Cloudy, Dense Fog early then Partly Cloudy, Continued Warm and Humid
		Climate Normal Period								Climate Record Period
		1991 - 2020								1893 - 2025
		May 17								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Temperature		72		69		65		+7		81		in	2015		49		in	1994
Minimum Temperature		58		53		49		+9		58		in	2025		35		in	1956
Average Temperature		65		61		57		+8		68		in	1977		46		in	1956
Month Avg Max Temperature		68.3		62.0		62.6		+5.6		69.9		in	1993		53.4		in	1917
Month Avg Min Temperature		52.8		47.3		46.5		+6.3		52.8		in	2025		40.2		in	1967
Month Average Temperature		60.6		54.9		54.6		+6.1		60.6		in	2025		47.2		in	1917
High Heat Index										82		in	2015
Low Wind Chill				`											32		in	1956
Heating Degree Days		0		4		8		-8		19		in	1956		0		in	2025
Month Heating DD		74		172		177		-103		303		in	1917		74		in	2025
Season Heating DD		4889		4903		5350		-461		6426		in	1905		4445		in	2012
Cooling Degree Days		0		0		0		+0		3		in	1977		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		67		60		54		+13		67		in	2025		36		in	1967
Minimum Dew Point		57		48		42		+15		57		in	2025		21		in	2023
Average  Dew Point		62		54		48		+14		62		in	2025		31		in	1967
Month Avg Max Dew Point		59.4		48.5		50.8		+8.5		59.4		in	2025		40.5		in	1966
Month Avg Min Dew Point		48.1		37.5		39.3		+8.8		48.1		in	2025		28.2		in	1966
Month Average Dew Point		54.0		43.2		45.1		+8.9		54.0		in	2025		34.4		in	1966
Precipitation		.00		.00		.10		-.10		1.65		in	1916
One Hour Rain		.00		.00						.41		in	1976
Half Hour Rain		.00		.00						.19		in	2014
Hourly Rain Rate		.00		.00						3.53		in	2014
Month Precipitation		4.46		4.89		1.91		+2.55		6.51		in	2006		.02		in	2015
Year Precipitation		17.26		27.81		17.64		-.38		33.69		in	1983		10.59		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 17								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Humidity		98%		95%		90%		+8%		100%		in	2018		54%		in	1977
Minimum Humidity		79%		65%		52%		+27%		94%		in	1990		22%		in	1993
Average Humidity		89%		80%		71%		+17%		97%		in	1990		44%		in	1977
Maximum Barometer		29.72		29.98		30.06		-00.34		30.50		in	2004		29.49		in	2008
Minimum Barometer		29.45		29.87		29.83		-00.38		30.38		in	2003		29.09		in	1985
Average Barometer		29.59		29.93		29.94		-00.36		30.44		in	2004		29.43		in	2008
Average Wind		8.6		12.0		6.8		+1.8		12.7		in	1967		2.3		in	2018
Direction		S		NNE		SE				WSW					NE
High Wind Gust		27		29		24		+4		39		in	1954		9		in	2018
Direction		NW		NE		SE				W					SSE
Maximum Water Temp		59.4		56.8		55.8		+3.6		59.4		in	2025		50.9		in	2020
Minimum Water Temp		58.1		53.4		52.4		+5.7		58.1		in	2025		46.4		in	2020
Average Water Temp		58.8		55.1		54.1		+4.6		58.8		in	2025		48.7		in	2020
Sunrise/ AM Twilight		5:23:23 AM						4:51:12 AM
Sunset / PM Twilight		7:59:56 PM						8:32:11 PM
Length Of Day		14:36:47
Special Conditions		Dense Fog
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