Portsmouth Rhode Island Weather Almanac
Wednesday, June 18, 2025
Dense Fog early then Cloudy, Dense Fog Late, Warmer, Humid
		Climate Normal Period								Climate Record Period
		1991 - 2020								1893 - 2025
		Jun 18								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Temperature		72		80		75		-3		91		in	1929		58		in	1920
Minimum Temperature		62		65		59		+3		68		in	1929		45		in	1965
Average Temperature		67		73		67		+0		80		in	1929		54		in	1920
Month Avg Max Temperature		73.1		75.2		72.0		+1.1		78.5		in	1925		64.2		in	1907
Month Avg Min Temperature		57.9		58.0		55.8		+2.1		59.4		in	1899		49.1		in	1907
Month Average Temperature		65.7		66.9		64.0		+1.7		68.9		in	1925		56.8		in	1907
High Heat Index		74		83						97		in	1929
Low Wind Chill															44		in	1965
Heating Degree Days		0		0		1		-1		11		in	1920		0		in	Many
Month Heating DD		24		5		41		-17		156		in	1907		3		in	1899
Season Heating DD		5026		4952		5500		-474		6601		in	1905		4421		in	1932
Cooling Degree Days		2		8		3		-1		15		in	1929		0		in	All
Month Cooling DD		37		39		31		+6		86		in	1925		0		in	Many
Year Cooling DD		37		39		31		+6		87		in	2001		1		in	2003
Maximum Dew Point		68		71		64		+4		73		in	1994		42		in	1950
Minimum Dew Point		61		62		54		+7		65		in	1994		32		in	1950
Average  Dew Point		65		67		59		+6		69		in	1994		37		in	1950
Month Avg Max Dew Point		64.1		63.9		61.1		+3.0		65.8		in	1996		52.9		in	1965
Month Avg Min Dew Point		53.7		53.3		51.2		+2.5		55.2		in	2005		42.0		in	1958
Month Average Dew Point		58.9		58.6		56.0		+2.9		60.3		in	1996		48.2		in	1965
Precipitation		.02		.00		.12		-.10		2.30		in	1922
One Hour Rain		.01		.00						.23		in	2009
Half Hour Rain		.01		.00						.13		in	2019
Hourly Rain Rate		.00		.00						1.19		in	2004
Month Precipitation		.80		.77		2.13		-1.33		8.66		in	1982		T		in	1949
Year Precipitation		21.19		29.93		21.17		+.02		38.15		in	1998		12.64		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 18								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Humidity		99%		95%		92%		+7%		100%		in	2017		57%		in	1956
Minimum Humidity		84%		73%		58%		+26%		95%		in	2017		28%		in	1950
Average Humidity		92%		84%		75%		+16%		98%		in	2017		45%		in	1956
Maximum Barometer		30.01		30.29		30.06		-00.05		30.39		in	1954		29.62		in	1952
Minimum Barometer		29.86		30.18		29.85		+00.01		30.18		in	2024		29.32		in	1985
Average Barometer		29.94		30.24		29.96		-00.02		30.25		in	1954		29.57		in	1952
Average Wind		5.5		7.8		5.5		-0.0		10.2		in	1984		1.8		in	1998
Direction		SSE		SSW		SSW				S					SSE
High Wind Gust		13		24		21		-8		41		in	1909		11		in	1998
Direction		S		SSW		S				NW					SSE
Maximum Water Temp		64.6		68.4		65.0		-0.4		69.4		in	2007		60.7		in	2003
Minimum Water Temp		63.5		66.2		61.5		+2.0		66.2		in	2024		54.9		in	2005
Average Water Temp		64.1		67.3		63.3		+0.8		67.6		in	2007		59.0		in	2005
Sunrise/ AM Twilight		5:10:37 AM						4:37:11 AM
Sunset / PM Twilight		8:21:51 PM						8:56:05 PM
Length Of Day		15:11:14
Special Conditions		Dense Fog
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