ISLESBORO, MAINE

Average Temperature

Years on Record: 66

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		7.4		-5.9		-4.8		0.2		6.1		11.9		17		20.1		19.3		15.2		9.4		3.9		-2.9

Average High Temperature

Years on Record: 66

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		13.3		-0.2		1.3		5.8		11.9		18.2		23.3		26.2		25.6		21.3		15.2		8.5		2.1

Average Low Temperature

Years on Record: 66

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		1.7		-11.6		-10.8		-5.4		0.2		5.6		10.7		13.8		13.1		9.1		3.7		-0.7		-7.9

Highest Recorded Temperature

Years on Record: 66

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		36.7		15		15.6		27.8		29.4		35		35.6		36.7		36.7		36.7		30.6		22.8		18.3

Lowest Recorded Temperature

Years on Record: 66

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-33.3		-33.3		-33.3		-27.8		-12.2		-5.6		0.6		6.1		1.7		-4.4		-6.7		-16.7		-32.8

Average Number of Days Above 90F/32C

Years on Record: 66

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		3.9		---		---		---		---		0.2		0.9		1.6		1.1		0.2		---		---		---

Average Number of Days Below 32F/0C

Years on Record: 66

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		157		29.8		26.9		27.1		15.6		2.2		---		---		---		0.6		8		18.5		28.3

Average Number of Days Below 0F/-17C

Years on Record: 66

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		15.9		7.1		5.2		1.1		---		---		---		---		---		---		---		---		2.6

Average Precipitation

Years on Record: 66

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1213		99		86		100		107		104		89		83		77		98		113		138		118

Average Number of Days With Precipitation

Years on Record: 66

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		104		9		7		8		9		10		9		9		8		8		8		10		9

Most Reported Precipitation in a Month

Years on Record: 66

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		411		260		200		269		347		250		228		221		175		269		411		327		257

Least Reported Precipitation in a Month

Years on Record: 66

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		4		20		14		6		9		7		22		8		16		16		4		50		29

Most Precipitation Reported in a Day

Years on Record: 66

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		192.3		86.4		73.2		104.1		121.2		89.9		96.5		95		86.9		192.3		127.8		116.8		90.9

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

Years on Record: 66

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		80		7		6		6		7		7		7		6		6		6		7		8		7

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

Years on Record: 66

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		33		3		3		3		3		3		2		2		2		2		3		4		3

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

Years on Record: 66

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		13		1		1		1		1		1		1		1		1		1		1		2		1

Average Snowfall

Years on Record: 66

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		131.8		36.6		34.5		22.4		3.3		---		---		---		---		---		0.2		4.6		30.2

Most Snow Reported in a Month

Years on Record: 66

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		114.3		96.5		104.1		114.3		40.6		---		---		---		---		---		7.6		45.7		104.1

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		4128.9		760		648.3		563.9		372.8		199.4		58.9		10		17.2		106.1		287.2		443.3		661.7

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		137.8		---		---		---		---		0.6		17.2		65		49.4		5.6		---		---		---

Growing Degree Days

Years on Record: 66

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1024.6		---		---		---		---		58.6		210		311.7		289.3		155		---		---		---

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.8		9.9		11		12.5		14		15.4		16.1		15.7		14.5		13		11.4		10.1		9.5

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		6.1		9.5		13.4		16.3		18.2		19.7		19.4		18.2		14.3		9.7		6.1		5

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.3		2.3		3.2		4.8		6.8		8.2		8.9		8.5		7.1		5.5		3.9		2.7		2

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15.1		12.2		15.3		17.2		16.9		16.7		17.1		17.3		17.9		16.6		13.6		10.4		9.5

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15.3		12.4		16		17.5		16.6		16.1		17.1		17.4		18.6		16.8		13.5		10.5		10.5

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		6.1		9.5		13.4		16.3		18.2		19.7		19.4		18.2		14.3		9.7		6.1		5

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.5		2.4		3.5		5.1		7		8.4		9		8.7		7.5		5.8		4		2.7		2.1

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		17.8		14.6		17.8		19.4		20.1		19.4		19.3		20		20.4		19.1		17.3		12.7		12.8

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		19.7		15.5		19.4		20.6		22.2		21.5		21.7		23.2		23.4		20.9		18.6		13.5		15.1

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.9		5.4		8.2		11.7		13		15.2		15.6		16.6		15.4		12.4		7.9		5.2		4.1

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		2.1		2.9		4.6		6.2		7.8		8.5		8		6.6		5.1		3.5		2.5		1.8

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		12.2		10		12.1		14.4		13.1		13.9		13.7		14.8		15		13.9		10.4		8.3		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		10.8		9.7		12		13.6		10.6		11.1		10.6		12.6		13.3		12.6		9.1		7.7		7