Portsmouth Rhode Island Weather Almanac
Monday, June 30, 2025
Clear early, Partly Cloudy Day to Cloudy & Dense Fog PM, Light Winds, Cooler
		Climate Normal Period								Climate Record Period
		1991 - 2020								1893 - 2025
		Jun 30								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Temperature		84		76		78		+6		93		in	1945		66		in	1967
Minimum Temperature		63		68		63		+0		71		in	2021		51		in	1919
Average Temperature		74		72		71		+3		80		in	2021		60		in	1967
Month Avg Max Temperature		77.3		77.0		73.8		+3.5		79.1		in	1957		66.5		in	1903
Month Avg Min Temperature		61.0		60.7		57.9		+3.1		61.3		in	2001		53.1		in	1907
Month Average Temperature		69.4		69.1		65.9		+3.4		69.4		in	2025		60.5		in	1903
High Heat Index		88		78						101		in	2021
Low Wind Chill
Heating Degree Days		0		0		0		+0		5		in	1967		0		in	Many
Month Heating DD		24		5		50		-26		159		in	1907		5		in	2024
Season Heating DD		5026		4952		5509		-483		6620		in	1905		4444		in	1932
Cooling Degree Days		9		7		6		+3		15		in	2021		0		in	All
Month Cooling DD		155		128		80		+75		165		in	1957		11		in	1972
Year Cooling DD		155		128		80		+75		181		in	1957		11		in	1972
Maximum Dew Point		72		74		67		+5		77		in	2021		53		in	1989
Minimum Dew Point		60		67		59		+1		68		in	2021		38		in	1978
Average  Dew Point		66		71		63		+3		73		in	2021		48		in	1989
Month Avg Max Dew Point		67.2		66.7		62.9		+4.3		67.2		in	2025		54.9		in	1965
Month Avg Min Dew Point		56.7		55.9		53.3		+3.4		57.2		in	2010		44.9		in	1958
Month Average Dew Point		61.9		61.3		58.0		+3.9		61.9		in	2025		50.3		in	1965
Precipitation		.00		1.12		.11		-.11		2.27		in	1939
One Hour Rain		.00		.84						.84		in	2024
Half Hour Rain		.00		.64						.64		in	2024
Hourly Rain Rate		.00		6.33						6.33		in	2024
Month Precipitation		.98		4.79		3.53		-2.55		10.87		in	1998		.05		in	1949
Year Precipitation		21.37		33.95		22.57		-1.20		40.39		in	1998		12.92		in	1957
Snow		0.0		0.0		#N/A		#N/A		0.0		in	1900		0.0		in	Many
Snow Depth		0		0		0				0		in	2020		0		in	Many
Month Snow		0.0		0.0		T				#N/A		in	#N/A		0.0		in	Many
Season Snow		11.9		12.7		33.8		21.9		84.1		in	1996		5.0		in	1998
		Jun 30								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Humidity		96%		99%		92%		+4%		100%		in	2005		66%		in	1978
Minimum Humidity		59%		89%		59%		+0%		93%		in	1973		29%		in	1989
Average Humidity		78%		94%		75%		+2%		96%		in	1998		50%		in	1978
Maximum Barometer		30.03		30.04		30.00		+00.03		30.41		in	1985		29.50		in	1957
Minimum Barometer		29.92		29.83		29.80		+00.12		30.20		in	2002		29.35		in	1998
Average Barometer		29.98		29.94		29.90		+00.08		30.24		in	2002		29.44		in	1957
Average Wind		4.3		8.2		6.1		-1.8		14.5		in	1975		2.0		in	1980
Direction		SSE		SSW		SSW				NE					NNE
High Wind Gust		16		31		22		-6		44		in	1957		11		in	1980
Direction		SSE		SSW		SSW				NW					ENE
Maximum Water Temp		69.3		67.7		68.4		+0.9		72.9		in	2021		63.6		in	2006
Minimum Water Temp		65.1		65.5		64.6		+0.5		68.4		in	2023		59.5		in	2003
Average Water Temp		67.2		66.6		66.5		+0.7		70.6		in	2021		61.9		in	2006
Sunrise/ AM Twilight		5:14:13 AM						4:41:32 AM
Sunset / PM Twilight		8:23:05 PM						8:56:47 PM
Length Of Day		15:08:52
Special Conditions		Dense Fog
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