Portsmouth Rhode Island Weather Almanac
Thursday, May 15, 2025
Cloudy, Heavy Rain, Dense Fog, Thunderstorm, Warm and Humid
		Climate Normal Period								Climate Record Period
		1991 - 2020								1893 - 2025
		May 15								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Temperature		67		65		65		+2		84		in	1900		50		in	1916
Minimum Temperature		59		55		48		+11		59		in	2025		38		in	1986
Average Temperature		63		60		56		+7		68		in	1976		46		in	1947
Month Avg Max Temperature		67.8		61.7		62.3		+5.5		71.3		in	2001		52.4		in	1917
Month Avg Min Temperature		52.1		46.4		46.2		+5.9		52.1		in	2025		39.8		in	1967
Month Average Temperature		60.1		54.3		54.3		+5.8		60.5		in	1930		46.3		in	1917
High Heat Index		59		63						83		in	1900
Low Wind Chill		0		0											37		in	1985
Heating Degree Days		2		5		9		-7		19		in	1947		0		in	1976
Month Heating DD		74		160		161		-87		280		in	1917		74		in	2025
Season Heating DD		4889		4891		5334		-445		6395		in	1905		4437		in	2012
Cooling Degree Days		0		0		0		+0		3		in	1976		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		64		61		53		+11		64		in	2025		35		in	2002
Minimum Dew Point		57		51		42		+15		57		in	2025		24		in	1971
Average  Dew Point		61		56		47		+14		61		in	2025		31		in	1971
Month Avg Max Dew Point		58.4		52.9		50.5		+7.9		58.4		in	2025		40.3		in	1966
Month Avg Min Dew Point		46.9		42.7		38.9		+7.9		46.9		in	2025		27.5		in	1966
Month Average Dew Point		52.9		48.1		44.7		+8.3		52.9		in	2025		33.9		in	1966
Precipitation		1.56		.79		.10		+1.46		1.56		in	2025
One Hour Rain		.59		.21						.59		in	2025
Half Hour Rain		.40		.15						.40		in	2025
Hourly Rain Rate		4.84		.65						4.84		in	2025
Month Precipitation		4.46		2.46		1.71		+2.75		6.16		in	2006		.01		in	2015
Year Precipitation		17.26		25.38		17.44		-.18		32.13		in	1983		10.56		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 15								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Humidity		99%		99%		90%		+9%		100%		in	2018		59%		in	2000
Minimum Humidity		86%		81%		53%		+33%		94%		in	1953		25%		in	1994
Average Humidity		93%		90%		72%		+21%		96%		in	1953		46%		in	2000
Maximum Barometer		30.04		29.97		30.09		-00.05		30.53		in	1971		29.61		in	1960
Minimum Barometer		29.82		29.76		29.85		-00.02		30.32		in	1999		29.40		in	2017
Average Barometer		29.93		29.87		29.97		-00.04		30.38		in	1999		29.58		in	1960
Average Wind		5.3		4.8		6.4		-1.1		14.3		in	2002		2.2		in	1962
Direction		ESE		E		S				WNW					SSE
High Wind Gust		19		23		22		-3		40		in	2002		9		in	1998
Direction		ESE		NE		SSE				WNW					SSE
Maximum Water Temp		57.6		56.5		55.1		+2.5		59.9		in	2007		49.5		in	2019
Minimum Water Temp		55.9		54.5		52.0		+3.9		56.6		in	2012		45.1		in	2020
Average Water Temp		56.8		55.5		53.5		+3.2		58.0		in	2007		47.5		in	2020
Sunrise/ AM Twilight		5:25:15 AM						4:53:14 AM
Sunset / PM Twilight		7:57:57 PM						8:30:01 PM
Length Of Day		14:32:56
Special Conditions		Dense Fog, Thunderstorm
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