WESTFIELD, MASSACHUSETTS

Average Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		9.1		-5.1		-2.7		1.9		8.4		14.4		19.1		21.6		21.1		16.6		9.9		4.3		-1.3

Average High Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		15.2		0.5		2.8		7.7		15.1		21.4		25.6		28.2		27.5		23.3		16.4		9.7		3.4

Average Low Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		3		-10.6		-8.1		-3.8		1.9		7.5		12.6		15		14.7		9.9		3.4		-1.1		-6.1

Highest Recorded Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		31.1		6.4		8.2		12.6		18.3		25.1		28.3		31.1		30.4		26.8		21.4		15.1		9.6

Lowest Recorded Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-16.4		-16.4		-16.3		-7.4		-1.5		5.4		10.5		13.5		12.2		6.6		-0.6		-3.8		-14.8

Average Number of Days Above 100F/38C

Years on Record: 30

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

Average Number of Days Above 90F/32C

Years on Record: 70

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		8.3		---		---		---		---		1		1.7		3.7		1		1		---		---		---

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		65.6		---		---		---		1.4		5.6		13.1		20.6		19.1		5.3		0.6		---		---

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		132.7		---		---		0.3		5.8		15.9		24.6		29.9		29.3		20.7		5.7		0.3		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		185.5		0.3		0.3		3.3		13		26.4		29.2		31		31		29.1		17.1		4.1		0.7

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		235		1.9		2.1		9.5		23.2		30.6		30		31		31		30		28.3		14.1		3.4

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		287.7		6.6		8.9		22.1		28.7		31		30		31		31		30		30.9		25.7		11.6

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		363.5		31		28		31		30		31		29.9		30.4		30.3		29.8		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		327.2		31		28		31		29.9		30.5		23.1		17.3		18.2		26.4		30.8		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		257.2		31		28		31		28.8		21.8		6.8		3.1		3.3		14.9		28.1		29.5		31

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		197.8		30.9		28		30.3		22.7		7		0.8		---		---		3.5		18.4		25.9		30.2

Average Number of Days Below 32F/0C

Years on Record: 70

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		131		26.8		25.8		23.6		10.3		0.6		---		---		---		---		4.5		13.9		25.5

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		63.1		21.1		16.3		7.3		0.5		---		---		---		---		---		0.1		3		14.9

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		24.9		12.9		6.3		1.5		---		---		---		---		---		---		---		0.3		3.9

Average Number of Days Below 0F/-17C

Years on Record: 70

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		4.2		1.2		2.3		---		---		---		---		---		---		---		---		---		0.7

Average Precipitation

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1229.4		83.8		71.1		104.1		111.8		111.8		111.8		104.1		106.7		114.3		121.9		104.1		86.4

Average Number of Days With Precipitation

Years on Record: 70

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		108		9		7		9		10		11		10		9		9		8		8		9		9

Most Reported Precipitation in a Month

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		336		336		180		199		327		188		309		242		231		325		285		253		201

Least Reported Precipitation in a Month

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		5		18		9		7		35		22		5		17		5		18		21		19		18

Most Precipitation Reported in a Day

Years on Record: 70

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		461		66		76.7		68.8		91.2		77		165.6		78.5		461		123.4		95.2		99.6		64.8

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

Years on Record: 70

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		76		6		6		7		7		7		7		6		6		6		5		7		6

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

Years on Record: 70

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		32		2		2		3		3		3		2		3		3		3		2		3		3

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

Years on Record: 70

		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.		1.8		0.9		0.8		1		1.4		1.9		2.7		3.1		3		2.4		1.7		1.3		1

Average Snowfall

Years on Record: 70

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		107.2		27.2		28.4		19.6		2.8		---		---		---		---		---		0.2		5.3		23.6

Most Snow Reported in a Month

Years on Record: 70

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		88.9		88.9		82		81.3		36.8		---		---		---		---		---		10.7		33		65.8

Average Relative Humidity

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		68.4		67		61.8		61.4		59.3		64.7		71.6		72.6		75.1		76.6		74		70.3		67.6

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		6613		1305		1058		914		538		243		62		10		18		137		472		759		1097

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		547		---		---		---		6		26		102		193		173		44		4		---		---

Growing Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2571		---		---		4		72		263		491		648		620		362		95		15		3

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		15.8		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
%		53.5		58.6		53.1		55.7		54.8		55		55.2		47.2		47.3		47.9		51.1		57.7		57.2

Average Opaque Sky Cover

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		49.9		55.3		49.6		53		51.7		51.3		50.7		43.2		42.9		44.7		48.5		54.2		54.1

Average Wind Speed

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
km/h		10.6		11.8		12.7		12.9		12.3		10.8		9.2		8.7		8.2		9		9.7		10.3		11.6

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.2		6.4		9.6		13		15.8		18.4		20.1		20.2		18.1		14.7		10.3		6.6		5.4

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.5		2.6		3.6		5.2		7		8.3		8.9		8.5		7.3		5.7		4.1		2.9		2.3

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.9		11.5		14.3		15.8		16.1		16.9		17.5		18		17.7		16.6		14.2		10.6		10.1

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.8		11.6		14.7		15.4		15		16		17.4		18.5		17.6		16.6		13.9		10.5		10.2

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.2		6.4		9.6		13		15.8		18.4		20.1		20.2		18.1		14.7		10.3		6.6		5.4

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		3.8		5.4		7.2		8.5		9.1		8.7		7.6		6		4.2		3		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		17.8		14.5		18.5		17.8		19.4		19.7		19.6		20.2		20.1		19.7		17.7		12.7		13.9

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		19.4		15.4		20.5		18.4		20.5		21.6		21.8		23.1		22.2		21.7		19		13.4		14.9

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		11.1		5.5		7.7		11.6		12.7		15.2		16.8		18.1		16.3		11.6		8.5		4.9		4.4

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		2.4		3		5		6.6		7.9		8.5		8		6.8		5.2		3.7		2.8		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		12.1		9.1		10.7		13.6		12.7		13.9		14.8		16.1		15.9		12.6		11		6.9		7.5

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.4		8.7		9.5		12.2		9.6		10.8		12.1		14.7		14.4		10.4		9.6		5.8		6.9