OAK BLUFFS, MASSACHUSETTS

Average Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		49.4		30		31.5		37		45.1		54.6		63.4		69.2		68.5		61.1		51.9		44.5		35.2

Average High Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		58.6		38.1		40.1		45.5		54.3		64.5		72.6		78.4		78		71.1		62.1		53.2		43.7

Average Low Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		40.3		21.9		23		28.6		35.8		44.7		54.3		60		59		51.1		41.7		35.8		26.7

Highest Recorded Temperature

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		97		59		59		65		79		83		97		94		93		89		82		74		65

Lowest Recorded Temperature

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		-9		-7		-9		3		19		31		41		50		51		36		29		15		-2

Average Number of Days Above 90F/32C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		0.9		---		---		---		---		---		0.1		0.5		0.3		---		---		---		---

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		---		---		---		0.2		0.8		2.8		10.4		10.5		1.1		---		---		---

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		107.4		---		---		---		0.5		7.6		19.4		29.7		29.1		17.5		3.4		0.1		---

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		176.6		0.1		0.1		1		6.1		21.7		29.4		31		31		29.5		19.4		6.3		1

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		246.4		3.6		2.7		8.1		22		30.3		30		31		31		30		30		19.9		7.7

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		313		13.7		14.2		23.9		29.1		31		30		31		31		30		31		28.5		19.6

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		359.6		31		28		31		30		31		29.9		29		28.3		29.5		30.9		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		319.7		31		28		31		30		30.8		23.6		14.3		15.5		24.3		30.1		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		253.5		31		28		31		29.4		23.2		6.6		3		5.6		13.9		23.9		27.1		30.8

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		181.2		30		27.5		28.6		21.5		7.6		1.3		---		0.2		4.3		13.6		18.9		27.9

Average Number of Days Below 32F/0C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		120.4		25		23.6		20.3		9.1		2.7		0.1		---		---		0.8		6.2		11		21.4

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		38.8		13.2		10.5		4.8		0.2		0.1		---		---		---		---		0.2		1.5		8.2

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		8.4		4.5		2.1		0.5		---		---		---		---		---		---		---		0.1		1.3

Average Number of Days Below 0F/-17C

Years on Record: 30

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

Average Precipitation

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		45.2		3.4		3.2		4.6		3.8		3.3		3.3		2.9		4		4.2		4.1		4.5		3.9

Average Precipitable Water

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		0.8		0.4		0.4		0.5		0.6		0.8		1.1		1.3		1.3		1		0.8		0.6		0.5

Average Number of Rainy Days

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		79.8		8.6		6.7		9.1		7.8		6.6		4.8		4.7		5.5		4.7		5.5		7.6		8.2

Average Snowfall

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		36.2		8.9		7.5		10.7		1.5		---		---		---		---		---		---		0.3		7.3

Average Dew Point

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		42		24		24		27		37		46		56		63		62		57		47		38		27

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		6059		1085		937		866		599		326		94		20		32		152		410		615		924

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		381		---		---		---		1		4		47		150		140		35		4		---		---

Growing Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2275		---		---		2		25		172		404		595		573		337		125		36		6

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		11.1		12.5		13.9		15.1		15.7		15.3		14.3		12.9		11.5		10.3		9.8

Average Total Sky Cover

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		52.8		56.2		51.1		56		53.7		54.4		53.7		48.4		49.4		48.8		49.3		56.6		55

Average Opaque Sky Cover

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		49.2		52.9		48.1		52.6		50.8		51.1		49.9		43.7		44.7		45.3		46.3		52.8		52.3

Average Wind Speed

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mph		10.4		11.6		11.6		12.1		11.5		10.6		9.4		8.7		8.3		9		10.1		10.8		11.5

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.9		1.9		2.7		3.8		4.7		5.7		6		5.9		5.4		4.4		3.2		2		1.6

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.5		0.8		1		1.5		1.9		2.3		2.4		2.3		2		1.6		1.1		0.8		0.7

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.4		3.2		3.9		4.6		4.8		5.2		5.3		5.3		5.3		5		4.4		3.3		2.9

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.6		3.3		4		4.6		4.7		5.4		5.6		5.6		5.5		5.1		4.5		3.4		2.9

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.9		1.9		2.7		3.8		4.7		5.7		6		5.9		5.4		4.4		3.2		2		1.6

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.6		0.8		1.1		1.5		2		2.4		2.5		2.4		2.1		1.7		1.2		0.9		0.7

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5.2		3.6		5.2		5.4		5.9		6		5.9		6.2		6.1		5.6		5.3		3.9		3.7

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		6		3.9		6.1		5.8		6.7		7.1		7		7.8		7.2		6.3		5.8		4.2		4

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.4		1.6		2.3		3.2		3.9		4.8		5.1		5.3		5		3.6		2.9		1.5		1.3

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.4		0.7		0.8		1.3		1.7		2		2.2		2		1.8		1.4		1		0.8		0.6

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.6		2.4		3		3.7		3.9		4.4		4.5		4.8		4.8		3.9		3.9		2.1		2.1

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.3		2.3		2.8		3.2		3.1		3.8		3.9		4.6		4.7		3.4		3.7		1.9		2