WALPOLE, MASSACHUSETTS

Average Temperature

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		9		-3.2		-2.1		1.8		7.8		13.2		18.3		21.2		20.1		16.1		10.9		5.2		-1.2

Average High Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		14.9		-0.4		2.8		6.9		13.2		19.4		24.7		27.7		27.6		23.7		18.8		7.9		5.1

Average Low Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		2.9		-12.5		-7.2		-3.4		0.2		6.2		11.7		14.4		14.2		12		6.2		-1.9		-5.2

Highest Recorded Temperature

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		37.8		20.6		21.1		25		32.2		33.3		35		37.8		36.7		37.8		31.1		27.8		20

Lowest Recorded Temperature

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-28.3		-28.3		-28.3		-25		-12.2		-5.6		0.6		3.9		---		-3.3		-9.4		-13.9		-23.9

Average Number of Days Above 90F/32C

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		7.5		---		---		---		---		0.3		1.6		3.4		1.7		0.4		---		---		---

Average Number of Days Below 32F/0C

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		149.2		28.6		25.7		25.1		13		3.2		---		---		---		1.4		8.6		17		26.5

Average Number of Days Below 0F/-17C

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		6.3		2.7		2.2		0.2		---		---		---		---		---		---		---		---		1.3

Average Precipitation

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1133		94		98		106		95		87		72		73		94		95		87		124		106

Average Number of Days With Precipitation

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		127		11		10		11		12		12		11		9		10		9		9		12		11

Most Reported Precipitation in a Month

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		520		249		154		224		171		206		197		190		520		226		250		201		284

Least Reported Precipitation in a Month

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		2		19		20		41		24		16		2		5		25		18		41		56		18

Most Precipitation Reported in a Day

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		196.1		73.9		59.7		113.8		53.6		78		44.5		53.3		196.1		145		128.3		75.2		76

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

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		77		7		7		7		7		7		6		5		6		5		5		8		7

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

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		31		3		3		3		3		2		2		2		2		2		2		4		3

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

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		11		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.		1.9		1		0.9		1.1		1.4		2		2.8		3.2		3.1		2.6		1.8		1.4		1.1

Average Snowfall

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		134.6		34.3		34.5		31.8		3.3		---		---		---		---		---		0.2		2.5		27.9

Most Snow Reported in a Month

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		116.1		103.4		116.1		111.2		15		---		---		---		---		---		5.8		11.7		66.5

Average Relative Humidity

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		69.8		65.6		60.1		62.5		64.5		69.8		74.9		74.7		75.3		77.3		74.8		71.6		66.9

Heating Degree Days

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2236.1		493.9		420		342.2		157.2		44.4		2.8		---		0.6		16.7		92.2		232.2		433.9

Cooling Degree Days

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		257.2		---		---		---		0.6		8.9		46.7		97.2		74.4		27.2		2.2		---		---

Growing Degree Days

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1220.5		---		---		---		---		99.9		250		347.9		313.4		181.7		27.6		---		---

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		11.1		12.5		13.9		15.2		15.8		15.4		14.3		12.9		11.5		10.3		9.7

Average Total Sky Cover

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		54.7		56.7		53.8		57.3		57.6		57		57.2		49.6		51.6		50.2		51.8		57.8		55.2

Average Opaque Sky Cover

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		51.2		53.9		50.9		54.2		55		54		53.3		45		46.7		46.8		48.5		54.1		52

Average Wind Speed

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
km/h		10.8		11.6		12.6		13.1		12.8		11.4		10.3		9.7		8.6		8.9		9.8		10.1		11.4

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.8		6.6		9.8		13.5		16.8		19.4		20.6		21.1		19.1		15.2		11		7		5.6

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.4		2.6		3.5		5.2		6.8		8.2		8.8		8.3		7.1		5.6		4		2.8		2.2

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15.7		11.9		14.6		16.5		17.2		17.8		18		18.8		18.7		17.4		15.4		11.6		10.6

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		16.1		12.3		15.3		16.5		16.9		17.7		18.3		20.1		19.7		17.8		15.7		11.9		11

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.8		6.6		9.8		13.5		16.8		19.4		20.6		21.1		19.1		15.2		11		7		5.6

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.7		2.7		3.7		5.4		7.2		8.5		9.1		8.7		7.5		6		4.2		2.9		2.3

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		18.8		14.4		18.6		19.4		22.5		20.3		20.4		21.4		22		20.3		18.9		13.7		14.2

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		21.4		15.3		20.9		21.1		26.7		22.8		23.6		25.9		26.3		22.7		20.7		14.8		15.2

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		5.7		8.3		12		13.4		15.6		16.8		18.3		17.1		13		8.9		5.3		4.3

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		4.9		2.4		3		4.6		5.7		7.7		8.3		7.6		6.2		5		3.6		2.7		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		9.3		11.4		14.3		13.5		14.3		14.7		16.4		16.6		14.3		11.6		7.7		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		11.2		9.1		11.1		13.2		10.8		11.3		12.1		15.1		15.7		13		10.3		6.8		6.5