ARCO, IDAHO

Average Temperature

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		42.5		16.3		21.4		31.4		43		52.3		59.9		67.8		65.5		56.1		45.3		30.7		19.9

Average High Temperature

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		57.5		29		34.6		44		57.2		67.5		76.3		86.4		84.3		74.2		61.4		43.5		32

Average Low Temperature

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		27.4		3.3		8		18.9		28.7		37.1		43.4		49.2		46.6		38		29.2		18		7.9

Highest Recorded Temperature

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		102		52		58		71		87		95		97		102		100		100		85		72		59

Lowest Recorded Temperature

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		-46		-46		-32		-20		-3		11		20		29		25		11		1		-22		-45

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		0.1		---		---		---		---		---		---		0.1		---		---		---		---		---

Average Number of Days Above 90F/32C

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		19.2		---		---		---		---		0.1		2		10.1		6.5		0.4		---		---		---

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		75.7		---		---		---		0.3		3.1		10.9		25.8		25.2		9.7		0.7		---		---

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		125.5		---		---		---		3.4		12.3		22.6		30.1		30.4		21.4		5.3		---		---

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		175		---		---		2.1		12.7		23.6		28.6		31		31		27.9		16.8		1.3		---

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		217.9		---		0.6		10		22.5		30		30		31		31		29.6		25.9		7.1		0.2

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		265.7		2.5		7.6		22.5		28.8		31		30		31		31		30		30.2		17.4		3.7

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		364.9		31		28		31		30		31		30		30.9		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		360.1		31		28		31		30		31		29.7		28.2		29.3		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		316.8		31		28		31		29.9		28.8		21.8		12.3		15.6		26.6		30.9		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		241		31		28		30.8		26.6		16.2		5.5		1.1		1.9		12.7		26.8		29.5		31

Average Number of Days Below 32F/0C

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		204.1		30.6		27.5		29.4		20.9		8		1.6		0.1		0.5		6.8		20.2		28.3		30.3

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		98.2		26.9		20.3		8.8		1.5		---		---		---		---		0.2		1.7		14.1		24.6

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		51		17.5		11.4		2.6		0.1		---		---		---		---		---		0.1		3.9		15.4

Average Number of Days Below 0F/-17C

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		30.1		12.2		7.5		1.8		---		---		---		---		---		---		---		1.1		7.4

Average Precipitation

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		9.5		0.9		0.8		0.6		0.8		1.1		1.1		0.5		0.7		0.6		0.6		0.7		1

Average Number of Days With Precipitation

Years on Record: 97

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

Most Reported Precipitation in a Month

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		4.8		4.8		3.5		2.6		3.1		4.2		4.1		3.4		3.9		2.5		3		2		4.3

Most Precipitation Reported in a Day

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		2.4		1.1		2.4		1.2		1.6		1.9		2.2		1.3		1.6		1.4		1.1		1		1.7

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		30		2.5		2.3		2.4		3		3.7		2.8		1.5		1.9		1.7		2.4		2.7		3.1

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

Years on Record: 97

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

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

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		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		4		0.3		0.3		0.3		0.4		0.5		0.5		0.4		0.3		0.3		0.2		0.2		0.3

Average Snowfall

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		30.6		9.6		6.2		2.6		0.7		0.4		---		---		---		---		0.4		2.5		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		2		1		---		---		---		---		---		---		---		---		1

Most Snow Reported in a Month

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		45.1		39.5		22		17		7.5		7		2.3		---		---		0.3		9		17.1		45.1

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		8009		1443		1186		943		611		364		147		32		40		231		583		1018		1412

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		313		---		---		---		---		6		37		145		111		15		---		---		---

Growing Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1953		---		---		1		32		157		344		578		536		256		48		1		---

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.7		9.9		11		12.5		14		15.3		16		15.6		14.4		12.9		11.4		10.2		9.5

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.3		1.9		2.8		4		5.2		6		6.8		6.9		6.1		4.9		3.3		2		1.7

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.3		0.6		0.8		1.3		1.8		2.1		2.2		2		1.7		1.3		0.9		0.7		0.5

Average 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		4		4.7		5.4		5.5		5.6		5.9		6.2		6.1		5.9		5.1		3.9		3.5

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5.9		4.3		5.1		5.7		6		6.3		7.2		7.9		7.5		6.8		5.6		4.1		4.1

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.3		1.9		2.8		4		5.2		6		6.8		6.9		6.1		4.9		3.3		2		1.7

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.5		0.6		1		1.4		1.9		2.3		2.4		2.2		1.9		1.5		1.1		0.7		0.5

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		6		4.9		5.7		6.3		6.4		6.7		6.8		6.9		6.7		6.6		6.4		5		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		7.5		5.5		6.5		7.2		7.7		9		9.7		9.8		8.7		8		7.6		5.6		4.9

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.8		1.8		2.3		3.5		4.5		5.1		5.8		6.4		5.6		4.1		2.9		1.7		1.5

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.1		0.5		0.7		1.1		1.5		1.7		1.8		1.6		1.5		1.1		0.7		0.6		0.5

Minimum 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		3.5		3.6		4.5		4.7		4.7		5.1		5.7		5.6		4.7		4.2		2.9		3.1

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.5		3.6		3.5		4.3		4.6		4.5		5.3		6.8		6.3		4.8		4.3		2.8		3.5