Portsmouth Rhode Island Weather Almanac
Wednesday, May 21, 2025
Cloudy, Very Light Rain Late, Breezy and Cooler
		Climate Normal Period								Climate Record Period
		1991 - 2020								1893 - 2025
		May 21								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Temperature		52		65		67		-15		85		in	1921		47		in	1929
Minimum Temperature		47		50		50		-3		64		in	1903		38		in	2002
Average Temperature		50		58		58		-8		73		in	1996		45		in	1990
Month Avg Max Temperature		67.2		62.1		63.3		+3.9		69.1		in	1918		56.7		in	1966
Month Avg Min Temperature		52.3		48.0		47.0		+5.3		52.3		in	2025		41.4		in	1956
Month Average Temperature		59.9		55.3		55.2		+4.7		59.9		in	2025		49.6		in	1966
High Heat Index										92		in	2022
Low Wind Chill		42													35		in	2002
Heating Degree Days		15		7		7		+8		20		in	1990		0		in	2023
Month Heating DD		107		204		206		-99		324		in	1966		107		in	2025
Season Heating DD		4922		4935		5379		-457		6467		in	1905		4465		in	2012
Cooling Degree Days		0		0		1		-1		8		in	1996		0		in	All
Month Cooling DD		0		0		1		-1		27		in	2001		0		in	Many
Year Cooling DD		0		0		1		-1		27		in	2001		0		in	Many
Maximum Dew Point		44		58		55		-11		75		in	2022		32		in	1967
Minimum Dew Point		43		49		44		-1		58		in	2022		25		in	1967
Average  Dew Point		44		54		50		-6		67		in	2022		29		in	1967
Month Avg Max Dew Point		57.9		54.4		51.5		+6.3		57.9		in	2025		42.0		in	1967
Month Avg Min Dew Point		47.4		44.5		40.1		+7.3		47.4		in	2025		30.0		in	1967
Month Average Dew Point		53.4		49.7		45.8		+7.5		53.4		in	2025		36.0		in	1967
Precipitation		.01		.00		.10		-.09		1.10		in	1986
One Hour Rain		.01		.00						.48		in	1986
Half Hour Rain		.01		.00						.24		in	2023
Hourly Rain Rate		.00		.00						1.81		in	2022
Month Precipitation		4.52		5.04		2.31		+2.21		6.96		in	2006		.09		in	2001
Year Precipitation		17.32		27.96		18.04		-.72		34.08		in	1983		10.81		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 21								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Humidity		91%		99%		91%		-0%		100%		in	2013		60%		in	1967
Minimum Humidity		72%		77%		54%		+18%		96%		in	1954		14%		in	1992
Average Humidity		82%		88%		72%		+9%		98%		in	1954		45%		in	1967
Maximum Barometer		30.08		30.04		30.07		+00.01		30.53		in	2021		29.53		in	2008
Minimum Barometer		30.01		29.95		29.85		+00.16		30.36		in	2021		29.12		in	1973
Average Barometer		30.05		30.00		29.96		+00.09		30.45		in	2021		29.40		in	1973
Average Wind		9.0		7.5		6.3		+2.7		16.3		in	1985		2.1		in	1994
Direction		NE		SSW		SSW				SSW					N
High Wind Gust		25		23		22		+3		37		in	1956		12		in	2016
Direction		NE		SSW		SW				NW					SSW
Maximum Water Temp		59.2		57.9		57.0		+2.2		60.6		in	2013		51.0		in	2020
Minimum Water Temp		55.4		55.6		53.5		+1.9		57.9		in	1998		47.3		in	2020
Average Water Temp		57.3		56.8		55.3		+2.0		59.1		in	1998		49.2		in	2020
Sunrise/ AM Twilight		5:19:59 AM						4:47:29 AM
Sunset / PM Twilight		8:03:45 PM						8:36:23 PM
Length Of Day		14:43:59
Special Conditions		None
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