Portsmouth Rhode Island Weather Almanac
Tuesday, May 20, 2025
Cloudy, Breezy and Cooler
		Climate Normal Period								Climate Record Period
		1991 - 2020								1893 - 2025
		May 20								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Temperature		60		70		66		-6		85		in	1996		51		in	1948
Minimum Temperature		48		50		50		-2		60		in	1903		38		in	1992
Average Temperature		54		60		58		-4		72		in	1903		47		in	1948
Month Avg Max Temperature		68.0		62.0		63.2		+4.8		69.0		in	1918		56.0		in	1966
Month Avg Min Temperature		52.6		47.9		46.9		+5.7		52.6		in	2025		41.3		in	1967
Month Average Temperature		60.4		55.2		55.1		+5.4		60.4		in	2025		49.1		in	1966
High Heat Index										88		in	1996
Low Wind Chill		42													37		in	1992
Heating Degree Days		11		5		7		+4		18		in	1948		0		in	2019
Month Heating DD		92		197		199		-107		318		in	1966		92		in	2025
Season Heating DD		4907		4928		5372		-465		6456		in	1905		4460		in	2012
Cooling Degree Days		0		0		0		+0		7		in	1903		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		49		62		55		-6		70		in	1996		38		in	2002
Minimum Dew Point		41		48		44		-3		57		in	2019		29		in	2002
Average  Dew Point		45		55		49		-4		61		in	2019		34		in	2002
Month Avg Max Dew Point		58.6		54.2		51.4		+7.2		58.6		in	2025		42.5		in	1967
Month Avg Min Dew Point		47.6		44.3		39.9		+7.7		47.6		in	2025		30.3		in	1967
Month Average Dew Point		53.4		49.5		45.6		+7.8		53.4		in	2025		36.4		in	1967
Precipitation		.00		.00		.10		-.10		1.71		in	2023
One Hour Rain		.00		.00						.43		in	1984
Half Hour Rain		.00		.00						.24		in	2018
Hourly Rain Rate		.00		.00						2.74		in	2018
Month Precipitation		4.51		5.04		2.21		+2.30		6.87		in	2006		.09		in	2001
Year Precipitation		17.31		27.96		17.94		-.63		34.03		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 20								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Humidity		83%		98%		93%		-10%		100%		in	2019		68%		in	1981
Minimum Humidity		64%		72%		56%		+8%		90%		in	1972		24%		in	1981
Average Humidity		74%		85%		75%		-1%		95%		in	1969		46%		in	1981
Maximum Barometer		30.04		30.07		30.07		-00.03		30.58		in	1992		29.65		in	2008
Minimum Barometer		29.78		30.01		29.85		-00.07		30.39		in	2020		29.32		in	1968
Average Barometer		29.91		30.04		29.96		-00.05		30.45		in	2021		29.51		in	1968
Average Wind		10.7		7.1		6.6		+4.1		14.3		in	1985		1.2		in	1996
Direction		NNW		S		S				SSW					SSW
High Wind Gust		30		19		22		+8		51		in	1963		12		in	1951
Direction		NNW		NNE		SSW				SSW					SE
Maximum Water Temp		60.1		56.7		56.6		+3.5		61.9		in	2012		49.5		in	2020
Minimum Water Temp		58.6		54.3		53.3		+5.3		58.6		in	2025		46.2		in	2020
Average Water Temp		59.4		55.5		55.0		+4.4		59.8		in	2012		47.9		in	2020
Sunrise/ AM Twilight		5:20:47 AM						4:48:22 AM
Sunset / PM Twilight		8:02:48 PM						8:35:21 PM
Length Of Day		14:42:15
Special Conditions		None
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