GROTON, MASSACHUSETTS

Average Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		45.4		21.1		23.1		32.7		44		55.5		64		68.6		66.5		58.2		46.8		37.7		26.9

Average High Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		57		31.6		33.9		43.4		56		68.2		76.4		81.2		79		70.8		59.5		47.9		36.4

Average Low Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		33.8		10.5		12.3		22		31.9		42.7		51.6		55.9		53.9		45.6		34		27.5		17.3

Highest Recorded Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		85		39.8		41.5		51.8		62.2		74.3		82.2		85		83.5		76		65.3		54.1		45.9

Lowest Recorded Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		-1		-1		2.5		16.5		26		38.2		45.8		52.1		48.7		40		26.7		22.3		3

Average Number of Days Above 90F/32C

Years on Record: 82

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		5.3		---		---		---		---		0.2		1.2		2.5		1.1		0.3		---		---		---

Average Number of Days Below 32F/0C

Years on Record: 82

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		158.1		29.9		27.2		25.1		15.1		2.2		---		---		---		0.4		8.4		21.2		28.4

Average Number of Days Below 0F/-17C

Years on Record: 82

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		10.1		3.9		4.1		0.2		---		---		---		---		---		---		---		---		1.8

Average Precipitation

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		48		3.7		3		3.6		3.8		5		4.2		4.2		4.6		4.1		4		4.1		3.6

Average Number of Days With Precipitation

Years on Record: 82

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		123		11		10		11		11		11		11		10		10		9		9		10		10

Most Reported Precipitation in a Month

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		12.8		11.1		6.4		8.3		9.5		12.8		9.3		9.7		12.1		9.7		9.8		8.8		8.4

Least Reported Precipitation in a Month

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		0.1		0.2		0.1		0.5		1.2		1.2		0.8		2.1		1.1		1.2		1.4		0.9		1.3

Most Precipitation Reported in a Day

Years on Record: 82

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		6.7		2.2		2.6		3.4		2.2		2.9		4.4		4.1		3		5.5		3.6		6.7		3.3

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

Years on Record: 82

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		79		7		6		7		7		7		7		7		6		6		5		7		7

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

Years on Record: 82

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		28		2		3		3		2		2		2		2		2		2		2		3		3

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

Years on Record: 82

		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 Snowfall

Years on Record: 82

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		63.3		16.5		17.6		10.5		3.5		---		---		---		---		---		0.1		3.7		11.4

Most Snow Reported in a Month

Years on Record: 82

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		56		43.5		56		29		20		---		---		---		---		---		2		18.3		33.8

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		7406		1363		1173		1002		632		304		87		21		44		212		566		820		1182

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		292		---		---		---		---		8		57		131		89		7		---		---		---

Growing Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1924.6		---		---		---		---		170.5		420		576.6		511.5		246		---		---		---

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		11.1		12.5		13.9		15.2		15.8		15.5		14.3		12.9		11.5		10.3		9.6

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.6		1.8		2.7		3.7		4.5		5		5.4		5.5		4.9		4		2.7		1.7		1.5

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		0.7		0.9		1.4		1.9		2.3		2.5		2.4		2		1.6		1.1		0.8		0.6

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.1		3.3		4.2		4.6		4.6		4.6		4.7		4.9		4.8		4.5		3.8		2.8		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		4.1		3.4		4.3		4.5		4.4		4.2		4.6		5		4.8		4.5		3.7		2.8		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		3.6		1.8		2.7		3.7		4.5		5		5.4		5.5		4.9		4		2.7		1.7		1.5

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		0.7		1		1.5		2		2.4		2.5		2.4		2.1		1.6		1.2		0.8		0.6

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		4.1		5.3		5.4		5.7		5.3		5.3		5.4		5.6		5.3		4.8		3.2		4.2

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5.4		4.4		5.9		5.7		6.3		5.7		5.9		6		6.4		5.7		5.2		3.3		4.6

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.1		1.5		2.4		3.2		3.5		4.3		4.4		4.8		4.3		3.4		2.2		1.4		1.2

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		0.6		0.8		1.3		1.7		2.2		2.4		2.3		1.9		1.5		1		0.8		0.5

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.4		2.7		3.5		3.9		3.6		3.9		3.9		4.3		4.2		3.8		2.8		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		2.5		3.5		3.6		2.7		3.1		3.1		3.7		3.7		3.3		2.4		1.8		2