Portsmouth Rhode Island Weather Almanac
Monday, April 21, 2025
Partly Cloudy to Cloudy PM, Much Cooler
		Climate Normal Period								Climate Record Period
		1991 - 2020								1893 - 2025
		April 21, 2025								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Temperature		54		51		57		-3		84		in	1957		40		in	1940
Minimum Temperature		40		38		41		-1		53		in	2012		24		in	1897
Average Temperature		47		45		49		-2		67		in	1957		36		in	1908
Month Avg Max Temperature		53.9		54.4		53.7		+0.2		61.7		in	1976		45.8		in	1907
Month Avg Min Temperature		38.6		40.6		38.1		+0.4		42.9		in	2002		31.6		in	1943
Month Average Temperature		46.5		47.8		46.2		+0.3		51.9		in	1945		39.3		in	1907
High Heat Index										83		in	1957
Low Wind Chill		36		33		35		+1							17		in	1897
Heating Degree Days		18		20		16		+2		29		in	1908		0		in	1957
Month Heating DD		389		362		395		-6		540		in	1907		275		in	1945
Season Heating DD		4752		4594		5045		-293		6124		in	1918		4151		in	2012
Cooling Degree Days		0		0		0		+0		2		in	1957		0		in	All
Month Cooling DD						0				13		in	1976
Year Cooling DD						0				13		in	1976
Maximum Dew Point		42		36		45		-3		62		in	1987		20		in	1981
Minimum Dew Point		22		30		32		-10		50		in	2012		5		in	1981
Average  Dew Point		32		33		38		-6		55		in	2019		13		in	1981
Month Avg Max Dew Point		45.3		43.9		41.4		+3.9		47.5		in	1987		32.1		in	1965
Month Avg Min Dew Point		30.4		34.7		28.1		+2.3		35.8		in	2010		18.0		in	1982
Month Average Dew Point		37.8		39.3		34.7		+3.1		41.1		in	2010		26.8		in	1975
Precipitation		.00		.00		.14		-.14		3.19		in	1991
One Hour Rain		.00		.00						.39		in	2009
Half Hour Rain		.00		.00						.22		in	2009
Hourly Rain Rate		.00		.00						2.18		in	2009
Month Precipitation		2.44		3.98		3.01		-.57		9.19		in	1983		.08		in	1966
Year Precipitation		11.70		22.82		14.47		-2.77		28.46		in	1983		6.71		in	2012
Snow		0.0		0.0		0.0		+0.0		0.2		in	1997		0.0		in
Snow Depth		0		0		0.0		-0.0		1		in	1904		0		in
Month Snow		T		0.0		0.5		-0.5		9.6		in	1996		0.0		in	2024
Season Snow		11.9		12.7		33.5		-21.6		84.1		in	1996		5.0		in	1998
		April 21, 2025								Record					Record
Observed Daily Data		2025		2024		Norm		Depart		Highest					Lowest
Maximum Humidity		85%		74%		88%		-3%		100%		in	2017		56%		in	1981
Minimum Humidity		32%		49%		45%		-13%		92%		in	2009		15%		in	1980
Average Humidity		59%		62%		67%		-8%		95%		in	2017		39%		in	1981
Maximum Barometer		30.35		30.01		30.10		+00.25		30.66		in	2013		29.54		in	1971
Minimum Barometer		30.11		29.96		29.84		+00.27		30.32		in	2022		29.11		in	1991
Average Barometer		30.23		29.99		29.97		+00.26		30.44		in	2022		29.38		in	1991
Average Wind		8.4		8.0		7.7		+0.7		14.3		in	1991		3.1		in	1997
Direction		S		NW		S				NE					SSW
High Wind Gust		22		24		25		-3		42		in	1945		15		in	1955
Direction		SSE		WNW		SSW				NW					SSE
Maximum Water Temp		49.3		48.9		48.6		+0.7		53.8		in	2012		41.2		in	2020
Minimum Water Temp		47.3		47.1		45.4		+1.9		50.8		in	2012		40.3		in	2020
Average Water Temp		48.3		48.0		47.0		+1.3		52.3		in	2012		40.8		in	2020
Sunrise/ AM Twilight		6:46:10 AM						5:25:11 AM
Sunset / PM Twilight		7:32:30 PM						8:02:17 PM
Length Of Day		13:37:33
Special Conditions		None
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