CASTLE TOWN, MONTANA

Average Temperature

Years on Record: 33

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		42.2		22.6		25.6		32.7		40.8		49.2		57		64.9		63.7		53.8		43.4		30.7		22.1

Average High Temperature

Years on Record: 33

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		55.2		32.5		36.5		44.2		53.9		63.2		71.2		81.6		80.7		69.4		56.9		40.8		32

Average Low Temperature

Years on Record: 33

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		29.2		12.4		14.7		21.1		27.7		35.3		42.8		48.4		46.7		38.3		30		20.5		12.2

Highest Recorded Temperature

Years on Record: 33

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		99		59		62		72		81		87		97		99		98		93		86		69		58

Lowest Recorded Temperature

Years on Record: 33

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		-46		-37		-43		-23		-2		16		23		33		23		12		-18		-30		-46

Average Number of Days Above 90F/32C

Years on Record: 33

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		8.8		---		---		---		---		---		0.7		4.4		3.5		0.2		---		---		---

Average Number of Days Below 32F/0C

Years on Record: 33

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		195.6		29.2		26.2		27.2		22.3		11		1.4		---		0.4		5.5		18.2		24.7		29.4

Average Number of Days Below 0F/-17C

Years on Record: 33

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		21.2		6.7		4		1.7		0.1		---		---		---		---		---		0.3		2.5		5.9

Average Precipitation

Years on Record: 33

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		12.8		0.4		0.4		0.7		1.2		2.1		2.5		1.5		1.1		1.1		0.8		0.5		0.5

Average Number of Days With Precipitation

Years on Record: 33

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		88		5		4		6		8		11		12		9		8		7		7		5		6

Most Reported Precipitation in a Month

Years on Record: 33

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		5.6		1.1		1.2		2		4		5.1		5		5.6		3.3		3.1		1.9		1.5		1.8

Least Reported Precipitation in a Month

Years on Record: 33

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		---		---		---		---		0.1		0.5		0.6		0.2		---		---		0.1		---		---

Most Precipitation Reported in a Day

Years on Record: 33

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		2.6		0.6		1.1		0.8		2.6		2		2.3		2.1		1.2		1.4		0.9		0.8		0.7

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

Years on Record: 33

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		39		1		1		3		4		5		7		5		4		3		3		1		2

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

Years on Record: 33

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

Average Snowfall

Years on Record: 33

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		39		6.3		6.4		7.7		3.6		0.9		---		---		---		0.9		2.2		4.2		6.8

Average Snow Cover

Years on Record: 21

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

Most Snow Reported in a Month

Years on Record: 33

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		38.3		22.4		24		38.3		21		7.5		---		---		---		13		11.5		14.9		21.1

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		8600		1357		1103		1013		731		493		252		123		136		360		667		1050		1315

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		180		---		---		---		---		---		18		77		72		13		---		---		---

Growing Degree Days

Years on Record: 33

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1210.6		---		---		---		---		---		210		461.9		424.7		114		---		---		---

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		15.7		16.4		16		14.6		13		11.4		9.9		9.2

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.8		1.4		2.3		3.4		4.6		5.6		6.2		6.6		5.6		4.2		2.7		1.6		1.2

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.7		0.8		1.2		1.7		2.1		2.5		2.6		2.6		2.2		1.9		1.3		0.9		0.7

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.2		2.4		3.5		4.3		4.8		5.1		5.4		5.9		5.6		4.8		3.7		2.6		2.1

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		2.1		3.1		3.7		4.6		5.2		5.8		6.6		5.8		4.6		3.5		2.3		1.9

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.8		1.4		2.3		3.4		4.6		5.6		6.2		6.6		5.6		4.2		2.7		1.6		1.2

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.8		0.9		1.3		1.9		2.2		2.5		2.7		2.8		2.4		2.1		1.4		1		0.8

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.8		2.8		3.9		5.1		5.5		5.9		6.1		6.7		6.3		6		4.2		2.9		2.4

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		2.5		3.6		4.8		5.7		6.5		7.2		7.7		6.8		6		4		2.7		2.2

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.2		1.2		2		2.8		4.1		4.8		5.2		5.1		5		3.4		2.4		1.4		1

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.6		0.7		1.1		1.6		2.1		2.4		2.6		2.5		2.2		1.7		1.2		0.8		0.6

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.5		2		3		3.4		4.2		4.4		4.5		4.5		5		3.8		3.2		2.1		1.7

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.1		1.7		2.6		2.7		3.6		3.8		4.2		4.1		4.9		3.3		3		1.8		1.5