DARBY, MONTANA

Average Temperature

Years on Record: 113

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		45.7		26.6		31.3		37.4		44.8		52.4		58.9		66.1		64.6		56.1		46.9		35.2		28.2

Average High Temperature

Years on Record: 113

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		59.1		35.7		41.6		49.1		58.3		66.9		74.2		84.4		82.8		72.4		60.9		45.3		37

Average Low Temperature

Years on Record: 113

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		32.3		17.5		20.8		25.6		31.3		37.8		43.6		47.8		46.4		39.8		32.9		25		19.3

Highest Recorded Temperature

Years on Record: 113

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		105		61		70		78		85		95		98		105		103		98		88		74		67

Lowest Recorded Temperature

Years on Record: 113

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		-36		-36		-35		-15		-2		17		25		4		6		14		-5		-25		-34

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		0.2		---		---		---		---		---		---		0.2		---		---		---		---		---

Average Number of Days Above 90F/32C

Years on Record: 113

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		16.8		---		---		---		---		0.2		1.6		8		6.2		0.8		---		---		---

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		67.7		---		---		---		0.3		3.6		9.2		22.9		22		8.7		0.9		---		---

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		121.2		---		---		0.5		3.9		12.1		20.7		28.9		29		19.2		6.8		0.3		---

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		174.4		0.2		0.6		4.9		11.6		22.7		28.4		30.8		30.8		26.7		15.4		2.5		---

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		228.7		2		4.7		14.8		22.4		29.6		30		31		31		29.4		24.8		8.4		0.7

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		292.2		10.8		15.9		26.8		29.5		31		30		31		31		30		30.1		18.3		7.9

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		365		31		28		31		30		31		30		31		31		30		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		362.7		31		28		31		30		31		29.8		29.6		30.3		29.9		31		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		329		31		28		31		30		29.3		24		16.9		19.7		27.5		30.5		30		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		238.3		30.8		27.9		29.9		26.1		16.3		6.3		1.7		2.2		11.9		25.8		28.4		30.9

Average Number of Days Below 32F/0C

Years on Record: 113

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		173.5		27.9		25.4		25.4		16.9		6.7		0.8		---		0.2		3.9		14.3		23.9		27.9

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		49.7		12.7		9.2		3.8		0.8		---		---		---		---		---		1.2		6.3		15.7

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		17.9		5.5		3.4		0.6		---		---		---		---		---		---		0.1		1.9		6.3

Average Number of Days Below 0F/-17C

Years on Record: 113

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		8.7		3.9		1.7		0.5		---		---		---		---		---		---		0.1		0.5		2.1

Average Precipitation

Years on Record: 113

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		15.7		1.4		1.1		1.1		1.1		1.8		1.9		0.9		1		1.2		1.1		1.6		1.4

Average Number of Days With Precipitation

Years on Record: 113

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		107		11		9		9		8		11		11		6		7		7		8		10		10

Most Reported Precipitation in a Month

Years on Record: 113

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		8.6		4.2		4.5		2.9		2.9		4.6		6.1		2.9		3		3.8		4.1		8.6		5.2

Least Reported Precipitation in a Month

Years on Record: 113

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		---		0.1		0.1		---		0.1		0.2		0.4		---		---		---		---		---		---

Most Precipitation Reported in a Day

Years on Record: 113

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		3.4		1		1.2		1.1		1.7		2.1		1.4		1.3		1.8		1.4		1		3.4		1.3

Avg. No. of Days w/Precip. Above 0.1in/2.5mm

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		48.1		3.9		3.3		3.2		4		5.3		6.1		3.1		3.5		3.5		3.8		4.5		3.9

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

Years on Record: 113

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		52		5		4		4		4		5		6		3		3		4		4		5		5

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

Years on Record: 113

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

Avg. No. of Days w/Precip. Above 0.5in/13mm

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		6.3		0.5		0.3		0.3		0.3		0.9		1		0.5		0.5		0.6		0.5		0.6		0.3

Average Snowfall

Years on Record: 113

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		39.7		8.7		9.2		5.7		1.7		0.3		---		---		---		0.2		0.9		4.8		8.2

Average Snow Cover

Years on Record: 51

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		1		4		3		2		---		---		---		---		---		---		---		---		2

Most Snow Reported in a Month

Years on Record: 113

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		45		36.4		45		33.6		13.2		4.8		1		---		---		4		10.3		30.6		39.3

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		7087		1141		943		815		601		374		182		53		63		246		566		900		1203

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		241		---		---		---		---		5		26		109		86		15		---		---		---

Growing Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1807		---		---		5		35		152		299		521		489		242		61		5		---

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		14.1		15.6		16.3		15.9		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
kWh/m2		4		1.6		2.6		3.8		4.9		5.6		6.2		6.8		5.9		4.5		2.9		1.8		1.4

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		0.9		1.3		1.8		1.9		2.5		2.6		2.6		2.3		1.9		1.4		1		0.8

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.4		2.8		3.9		4.8		5.1		5.1		5.4		6.1		5.9		5.1		3.9		2.9		2.4

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.4		2.4		3.5		4.3		5.3		5.1		5.8		6.9		6.2		5		3.7		2.5		2.2

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4		1.6		2.6		3.8		4.9		5.6		6.2		6.8		5.9		4.5		2.9		1.8		1.4

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.9		1		1.4		1.9		2		2.5		2.7		3.1		2.6		2.1		1.5		1.1		0.9

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5.1		3.1		4.2		5.5		5.9		6		6.1		7		6.6		6.2		5		3.3		2.6

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5.3		2.7		3.9		5.1		6.4		6.7		7.2		7.8		7.1		6.2		4.9		2.9		2.5

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.4		1.5		2.3		3.5		4.4		5		5.2		5.2		5.2		3.5		2.4		1.4		1.3

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.7		0.9		1.2		1.7		1.9		2.4		2.6		2.5		2.2		1.7		1.2		0.8		0.8

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.8		2.6		3.4		4.3		4.6		4.5		4.6		4.7		5.2		3.9		3.2		2.2		2.2

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.5		2.2		3		3.7		4.5		4.1		4.2		4.4		5.2		3.4		3		1.9		1.9