BLOCK ISLAND, RHODE ISLAND

Average Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		10.8		0.3		0.9		3.4		8.2		12.8		18.2		21.2		21.1		18.2		13.1		8.6		3.1

Average High Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		15.1		4.3		4.9		7.6		12.6		17.3		22.8		25.5		25.3		22.6		17.2		12.4		7.3

Average Low Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		6.6		-3.7		-3		-0.7		3.8		8.4		13.6		16.9		16.9		13.8		8.9		4.7		-1.1

Highest Recorded Temperature

Years on Record: 39

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		33.3		14.4		16.7		23.3		33.3		28.3		32.2		32.8		32.8		30.6		26.7		21.1		17.8

Average Number of Days Above 90F/32C

Years on Record: 69

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		0.3		---		---		---		---		---		---		0.1		0.2		---		---		---		---

Average Number of Days Above 80F/26C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		25.7		---		---		---		---		0.5		3.3		10.8		9.1		2		0.1		---		---

Average Number of Days Above 70F/21C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		109.6		---		---		0.1		0.3		3.4		21.9		29.6		29.7		20.7		3.9		---		---

Average Number of Days Above 60F/15C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		177.4		0.3		---		0.7		5.7		21.7		29.5		31		31		29.7		20.5		6.7		0.6

Average Number of Days Above 50F/10C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		252		3.8		2.5		7.2		23		30.7		30		31		31		30		30.7		22.4		9.8

Average Number of Days Above 40F/4C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		320.3		15.6		14.7		24.4		29.6		31		30		31		31		30		31		29		23.1

Average Number of Days Below 70F/21C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		364		31		28		31		30		31		30		30.6		30.5		29.9		31		30		31

Average Number of Days Below 60F/15C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		302		31		28		31		30		30.8		23.5		8		8.9		20.3		29.5		30		31

Average Number of Days Below 50F/10C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		224.7		30.9		28		31		29.9		22.4		2.7		---		0.1		3.8		19		26.4		30.7

Average Number of Days Below 40F/4C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		150.4		29.4		27.1		28.8		17.1		1.9		0.1		---		---		0.1		3.6		14.9		27.4

Average Number of Days Below 32F/0C

Years on Record: 69

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		85.9		23.4		21.4		16.2		2.8		---		---		---		---		---		0.2		4.4		17.4

Average Number of Days Below 20F/-6C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		21.7		8.5		5.4		2.6		0.2		---		---		---		---		---		---		0.4		4.5

Average Number of Days Below 10F/-12C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		3.8		2.1		0.7		---		---		---		---		---		---		---		---		---		1.1

Average Number of Days Below 0F/-17C

Years on Record: 69

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		0.3		0.1		0.1		---		---		---		---		---		---		---		---		---		0.1

Average Precipitation

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1082		99.1		73.7		104.1		96.5		88.9		96.5		73.7		76.2		86.4		99.1		96.5		96.5

Average Number of Days With Precipitation

Years on Record: 69

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		109		10		9		11		10		10		8		7		8		7		8		10		11

Most Reported Precipitation in a Month

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		234		224		175		204		234		155		220		180		228		174		179		231		169

Least Reported Precipitation in a Month

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		4		6		20		27		21		36		12		8		4		8		12		23		24

Most Precipitation Reported in a Day

Years on Record: 69

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		166.4		86.1		72.6		68.6		68.3		93.2		109.2		86.1		108.2		166.4		165.3		86.9		110

Avg. No. of Days w/Precip. Above 0.1in/2.5mm

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		68.4		5.7		5.4		6.5		6.6		6.6		4.6		4.5		4.3		4.9		6.3		6.7		6.3

Avg. No. of Days w/Precip. Above 0.2in/5mm

Years on Record: 69

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		71		7		6		7		6		6		5		5		5		5		5		7		7

Avg. # of Days w/Precip. Above 0.4in/10mm

Years on Record: 69

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		26		2		2		3		2		2		1		2		2		2		2		3		3

Avg. No. of Days w/Precip. Above 0.5in/13mm

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		25.6		2.5		2		2.5		2.3		1.9		1.7		1.9		2.2		2.1		1.8		2.5		2.2

Avg. No. of Days w/Precip. Above 1in/25mm

Years on Record: 69

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		12		1		1		1		1		1		1		1		1		1		1		1		1

Average Precipitable Water

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm.		2		1.1		1		1.2		1.5		2.1		3		3.4		3.3		2.7		1.9		1.5		1.2

Average Snowfall

Years on Record: 69

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		53.9		15.5		16		13.7		1		---		---		---		---		---		---		0.5		7.1

Most Snow Reported in a Month

Years on Record: 69

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		112		112		42.9		61.2		9.9		---		---		---		---		---		---		6.3		26.4

Average Relative Humidity

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		70.7		65		63.2		67.5		70.7		74.5		78.2		76.8		78.1		74.9		69		65.4		64.1

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		5380		1004		875		832		549		308		61		5		6		65		297		528		849

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		445		---		---		---		---		3		53		166		161		58		4		---		---

Growing Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2572		1		---		2		24		171		442		626		620		443		189		50		4

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.7		10.1		11.2		12.5		13.8		15.1		15.7		15.3		14.2		12.9		11.5		10.4		9.8

Average Total Sky Cover

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		50.2		56.2		51.6		52.8		52.5		51.9		51.2		41		43		42.6		51		52		55

Average Opaque Sky Cover

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		44.6		50.2		44.9		46.9		47.8		46.4		46.8		36		35.9		37.4		45.7		46.8		49.3

Average Wind Speed

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
km/h		18.4		20.8		20.2		20.3		19.1		17.8		17.3		15.9		15.1		16.1		18.3		19.7		20.9

Highest Reported Hourly Wind Speed

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
km/h		85.3		57.9		74		72.4		46.7		46.7		45.1		45.1		46.7		85.3		59.5		61.2		64.4

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.7		6.8		9.9		13.6		16.4		19.3		20.7		20.2		18.4		15.1		11.2		7.2		5.8

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.6		2.7		3.7		5.3		7		8.3		8.8		8.5		7.3		5.7		4.1		3		2.4

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15.4		11.9		14.2		16.4		16.7		17.7		18		18		17.9		17		15.4		11.4		10.5

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15.5		12.2		14.8		16.3		15.8		17.2		18.3		18.3		17.9		17.1		15.5		11.6		10.8

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.7		6.8		9.9		13.6		16.4		19.3		20.7		20.2		18.4		15.1		11.2		7.2		5.8

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.8		2.8		3.9		5.5		7.2		8.5		9.1		8.8		7.6		6		4.4		3.1		2.5

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		18.2		14.7		18.4		18.8		19.4		19.8		20.4		20.7		20.8		20		19.3		13.7		12.9

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		20.1		15.7		20.8		19.9		20.5		21.6		23.5		24		23.5		22		21.2		14.7		13.9

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		11.6		5.9		7.6		12.1		13.8		15.9		16.7		17.8		16.3		12.6		9.7		5.6		4.7

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.2		2.5		3.1		4.9		6.6		7.9		8.3		7.9		6.7		5.2		3.6		2.8		2.2

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		12.6		9.5		10		14.2		13.8		14.6		14.7		15.9		15.8		13.7		12.7		8.1		7.7

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.9		9.2		8.8		12.9		11		11.7		11.8		14		14		11.9		11.8		7.2		7.2