FORSYTH, MONTANA

Average Temperature

Years on Record: 36

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		8.3		-6.2		-3		2.6		8.6		13.9		18.8		22.8		21.7		15.7		8.7		0.8		-5.2

Average High Temperature

Years on Record: 36

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		16.1		0.7		4.2		9.9		16.7		21.7		26.7		31.6		30.7		24.4		16.7		7.8		1.4

Average Low Temperature

Years on Record: 36

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		0.5		-13.1		-10.2		-4.8		0.6		6		10.8		14		12.7		6.9		0.6		-6.2		-11.8

Highest Recorded Temperature

Years on Record: 36

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		43.3		21.1		22.8		30		32.8		37.2		41.1		43.3		40.6		38.9		33.9		27.8		21.1

Lowest Recorded Temperature

Years on Record: 36

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-42.2		-38.9		-38.9		-32.8		-17.2		-7.2		1.1		5		---		-7.2		-23.9		-32.8		-42.2

Average Number of Days Above 90F/32C

Years on Record: 36

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		39.7		---		---		---		---		1.1		5.2		15.3		14.1		3.8		0.1		---		---

Average Number of Days Below 32F/0C

Years on Record: 36

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		171.6		30.1		26.7		25.9		13.5		3.3		---		---		0.1		1.7		13.8		26.5		30.1

Average Number of Days Below 0F/-17C

Years on Record: 36

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		24.8		9.2		5.3		1.5		---		---		---		---		---		---		---		1.9		6.8

Average Precipitation

Years on Record: 36

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		366		12		11		23		36		65		58		35		28		36		31		18		14

Average Number of Days With Precipitation

Years on Record: 36

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		78		6		5		6		8		10		9		7		5		5		6		6		5

Most Reported Precipitation in a Month

Years on Record: 36

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		218		28		34		62		86		195		138		218		108		173		77		52		37

Least Reported Precipitation in a Month

Years on Record: 36

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		---		---		2		---		3		14		8		---		---		---		---		---		---

Most Precipitation Reported in a Day

Years on Record: 36

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		88.7		8.6		22.9		38.1		33		42.2		47.2		63.2		88.7		68.1		30.2		26.4		27.4

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

Years on Record: 36

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		40		2		2		3		4		6		6		4		3		3		3		2		2

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

Years on Record: 36

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		8		---		---		---		1		2		1		1		1		1		1		---		---

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

Years on Record: 36

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

Average Number of Rainy Days

Years on Record: 32

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		30		1		1		1		2		5		5		3		2		2		2		1		1

Average Snowfall

Years on Record: 36

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		75.7		15		11.4		12.9		4.1		1.8		---		---		---		0.5		3.6		10.4		16

Most Snow Reported in a Month

Years on Record: 36

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		58.4		49.5		40.6		39.4		33		30.5		---		---		---		12.7		25.4		47		58.4

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		3960.6		766.1		583.9		477.8		284.4		138.9		45		10		19.4		105.6		281.7		526.7		721.1

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		396.1		---		---		---		0.6		13.9		74.4		145.6		131.7		30		---		---		---

Growing Degree Days

Years on Record: 36

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1315.1		---		---		---		---		120.6		263.3		396.1		363.4		171.7		---		---		---

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.8		9.7		10.9		12.5		14.2		15.6		16.4		16		14.6		13		11.4		10		9.3

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.2		5.3		8.7		12.7		17.4		21.1		23.5		24.1		21.1		15.4		10.2		6.3		4.6

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		6.2		3.1		4.4		6.3		7		8.8		9.3		9.1		8		6.7		4.9		3.5		2.7

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		9.2		12.9		15.6		18.2		19.4		20.4		21.5		21		17.8		13.9		10.2		7.9

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15.7		7.8		11.6		13.8		18.6		20.2		22.9		24.4		22.5		17.1		13.1		9		7.2

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.2		5.3		8.7		12.7		17.4		21.1		23.5		24.1		21.1		15.4		10.2		6.3		4.6

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		6.5		3.5		4.9		6.7		7.4		9		9.6		9.8		8.2		7.2		5.3		3.8		3.1

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		17.9		10.8		15.1		18.1		21.8		22.5		22.9		23.8		22.1		20.7		15.8		11.7		9.3

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		18.7		9.8		14.4		17		23.5		25.4		27.2		27.5		24		20.7		15.1		10.7		8.9

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		11.8		4.6		7.1		10.6		14.6		16.3		19.7		19.3		19.3		12.6		9		4.9		3.7

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.8		2.8		3.8		5.8		6.6		8.7		9.2		8.9		7.9		6.2		4.5		3		2.3

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		12.8		7.7		10.5		13		15.1		14.9		17.1		17.1		19.1		14.2		11.9		7.5		6.1

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		11.6		6.3		8.9		10		14.3		12		16.4		16.4		19.6		12.6		11.1		6.4		5.2