Portsmouth Rhode Island Weather Almanac
Tuesday, May 18, 2021
Partly Cloudy and Very Warm
Climate Normal Period						Climate Record Period
1991- 2020						1893 - 2021
		May 18, 2021								Record					Record
Observed Daily Data		2021		2020		Norm		Depart		Highest					Lowest
Maximum Temperature		77		65		66		+11		82		in	2017		45		in	2007
Minimum Temperature		53		50		49		+4		62		in	2017		35		in	1983
Average Temperature		65		58		57		+8		72		in	2017		44		in	2007
Month Avg Max Temperature		65.9		62.3		62.8		+3.1		69.7		in	1993		54.1		in	1917
Month Avg Min Temperature		46.7		44.1		46.6		+0.1		50.2		in	1930		40.4		in	1967
Month Average Temperature		56.6		53.4		54.7		+1.8		59.9		in	1930		47.8		in	1917
HDD		0		7		8		-8		21		in	2007		0		in	2021
Month HDD		152		208		185		-33		310		in	1917		96		in	1993
Season HDD		4961		5029		5358		-397		6439		in	1905		4454		in	2012
CDD		0		0		0		+0		7		in	2017		0		in
Month CDD		0		0		0		+0		27		in	2001		0		in	2021
Year CDD		0		0		0		+0		27		in	2001		0		in	2021
Maximum Dew Point		57		54		54		+3		67		in	2017		33		in	1981
Minimum Dew Point		46		46		43		+3		57		in	2017		25		in	1981
Average  Dew Point		52		50		48		+4		62		in	2017		29		in	1981
Month Avg Max Dew Point		49.0		47.8		51.0		-2.0		56.4		in	2004		41.0		in	1966
Month Avg Min Dew Point		38.0		34.1		39.5		-1.5		46.3		in	1953		28.8		in	1966
Month Average Dew Point		43.7		41.2		45.2		-1.6		50.4		in	1998		34.9		in	1966
Precipitation		.00		.00		.10		-.10		1.93		in	2002
One Hour		.00		.00						.40		in	1970
Hourly Rate		.00		.00						.82		in	2004
Month Precipitation		2.38		2.15		2.01		+.37		6.51		in	2006		.02		in	2015
Year Precipitation		14.08		18.35		17.74		-3.66		33.69		in	1983		10.69		in	1927
Snow		0.0		0.0		0.0		+0.0		0.0		in
Snow Depth		0		0								in
Month Snow		0.0		0.0		0.0		+0.0		1.7		in	1977		0.0		in
Season Snow		27.7		12.9		33.5		-5.8		84.1		in	1996		5.0		in	1998
		May 18, 2021								Record					Record
Observed Daily Data		2021		2020		Norm		Depart		Highest					Lowest
Maximum Humidity		80%		91%		91%		-11%		100%		in	2018		63%		in	1981
Minimum Humidity		35%		64%		57%		-22%		91%		in	2004		25%		in	1983
Average Humidity		58%		78%		74%		-16%		96%		in	2004		45%		in	1981
Maximum Barometer		30.28		30.24		30.08		+00.20		30.50		in	1983		29.48		in	2008
Minimum Barometer		30.14		30.14		29.87		+00.27		30.34		in	2003		29.05		in	1985
Average Barometer		30.21		30.19		29.97		+00.24		30.37		in	2003		29.27		in	1985
Average Wind		5.5		3.5		6.3		-0.8		14.6		in	2000		1.9		in	1995
Direction		SSW		NE		NE				S					SSE
High Wind Gust		28		17		22		+6		41		in	2000		11		in	1995
Direction		SSW		ENE		SSE				SW					NW
High Heat Index										83		in	2017
Wind Chill															32		in	1981
Maximum Water Temp		57.6		50.5		55.5		+2.1		59.5		in	2017		50.5		in	2020
Minimum Water Temp		55.4		45.9		52.4		+3.0		56.6		in	2013		45.9		in	2020
Average Water Temp		56.5		48.2		54.0		+2.5		57.9		in	2013		48.2		in	2020
Sunrise/ AM Twilight		5:22:10 AM						4:50:13 AM
Sunset / PM Twilight		8:01:18 PM						8:33:15 PM
Length Of Day		14:39:08
Special Conditions		None
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