Portsmouth Rhode Island Weather Almanac
Saturday, May 15, 2021
Clear and Warmer
Climate Normal Period						Climate Record Period
1991- 2020						1893 - 2021
		May 15, 2021								Record					Record
Observed Daily Data		2021		2020		Norm		Depart		Highest					Lowest
Maximum Temperature		75		71		65		+10		84		in	1900		50		in	1916
Minimum Temperature		48		50		48		+0		57		in	2012		38		in	1986
Average Temperature		62		61		56		+6		68		in	1976		46		in	1947
Month Avg Max Temperature		64.0		61.5		62.3		+1.7		71.3		in	2001		52.4		in	1917
Month Avg Min Temperature		45.6		43.1		46.2		-0.6		50.4		in	1930		39.8		in	1967
Month Average Temperature		55.1		52.6		54.3		+0.9		60.5		in	1930		46.3		in	1917
HDD		3		4		9		-6		19		in	1947		0		in	1976
Month HDD		148		186		161		-13		280		in	1917		79		in	1930
Season HDD		4957		5007		5334		-377		6395		in	1905		4437		in	2012
CDD		0		0		0		+0		3		in	1976		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		50		61		53		-3		64		in	2004		35		in	2002
Minimum Dew Point		38		46		42		-4		55		in	2014		24		in	1971
Average  Dew Point		44		54		47		-3		59		in	2014		31		in	1971
Month Avg Max Dew Point		48.3		46.6		50.5		-2.1		55.7		in	2004		40.3		in	1966
Month Avg Min Dew Point		37.0		31.9		38.9		-1.9		45.7		in	1998		27.5		in	1966
Month Average Dew Point		42.8		39.5		44.7		-1.9		49.9		in	1998		33.9		in	1966
Precipitation		.00		.42		.10		-.10		1.53		in	1938
One Hour		.00		.15						.56		in	1978
Hourly Rate		.00		.36						4.76		in	2010
Month Precipitation		2.37		1.95		1.71		+.66		6.16		in	2006		.01		in	2015
Year Precipitation		14.07		18.15		17.44		-3.37		32.13		in	1983		10.56		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 15, 2021								Record					Record
Observed Daily Data		2021		2020		Norm		Depart		Highest					Lowest
Maximum Humidity		74%		95%		90%		-16%		100%		in	2018		59%		in	2000
Minimum Humidity		31%		64%		53%		-22%		94%		in	1953		25%		in	1994
Average Humidity		53%		80%		72%		-19%		96%		in	1953		46%		in	2000
Maximum Barometer		30.22		30.11		30.09		+00.13		30.53		in	1971		29.61		in	1960
Minimum Barometer		30.16		29.81		29.84		+00.32		30.32		in	1999		29.40		in	2017
Average Barometer		30.19		29.96		29.97		+00.22		30.38		in	1999		29.58		in	1960
Average Wind		4.5		7.4		6.4		-1.9		14.3		in	2002		2.2		in	1962
Direction		SSW		SSW		S				WNW					SSE
High Wind Gust		20		20		22		-2		40		in	2002		9		in	1998
Direction		WSW		SSE		SSE				WNW					SSE
High Heat Index										83		in	1900
Wind Chill															37		in	1985
Maximum Water Temp		55.6		49.8		54.7		+0.9		59.9		in	2007		49.5		in	2019
Minimum Water Temp		53.2		45.1		51.5		+1.7		56.6		in	2012		45.1		in	2020
Average Water Temp		54.4		47.5		53.1		+1.3		58.0		in	2007		47.5		in	2020
Sunrise/ AM Twilight		5:24:53 AM						4:53:14 AM
Sunset / PM Twilight		7:58:22 PM						8:30:01 PM
Length Of Day		14:33:29
Special Conditions		None
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