KOYUKUK NATIONAL WILDLIFE REFUGE, ALASKA

Average Temperature

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		24		-9.9		-6.5		---		23.7		44.3		58.4		60.5		54.7		42.7		22.4		3.2		-9.9

Average High Temperature

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		33.8		-1		3.7		---		35.7		55		69.3		70.5		64.4		51.5		29.6		10.9		-1.4

Average Low Temperature

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		14.1		-18.8		-16.7		---		11.8		33.5		47.5		50.5		45		33.9		15.2		-4.5		-18.5

Highest Recorded Temperature

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		90		40		38		62		78		90		90		86		76		58		46		38		90

Lowest Recorded Temperature

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		-68		-68		-66		-36		-8		29		30		24		4		-26		-52		-66		-68

Average Number of Days Above 90F/32C

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		0.8		---		---		---		---		0.1		0.3		---		---		---		---		---		0.4

Average Number of Days Below 32F/0C

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		231		28		30.6		28		28.6		13		1.1		0.1		1.3		11.7		29		29.2		30.8

Average Number of Days Below 0F/-17C

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		106		24.1		21.6		6.9		0.2		---		---		---		---		4.7		16		23.5		9

Average Precipitation

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		12.1		0.8		0.7		1		0.3		0.2		0.9		1.9		2.3		1.3		0.9		0.6		1.1

Average Number of Days With Precipitation

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		51		3		3		3		1		2		4		7		9		6		4		5		4

Most Reported Precipitation in a Month

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		6		4.5		2.9		6		3.2		0.9		3.7		5.1		5.8		4.2		2.5		1.4		5.5

Least Reported Precipitation in a Month

Years on Record: 22

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

Most Precipitation Reported in a Day

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		5		3.1		1.5		2.1		1.5		0.5		1.9		2.5		2		1.4		1.1		1		5

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

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		31		2		2		2		1		1		2		4		5		4		3		2		3

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

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		6		1		---		1		---		---		---		1		1		1		1		---		---

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

Years on Record: 22

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

Average Snowfall

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		17.3		6.4		1.5		1.9		0.3		---		---		---		---		0.4		2		2.9		1.9

Average Snow Cover

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		9		18		22		25		20		3		---		---		---		---		2		6		11

Most Snow Reported in a Month

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		50.2		50.2		7		10		2.7		0.2		---		---		---		4		10		5.4		4

Heating Degree Days

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		9999.9		2012		1735		1580		938		339		37		20		80		374		1010		1555		2011

Cooling Degree Days

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		50		---		---		---		---		---		15		30		5		---		---		---		---

Growing Degree Days

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		721.1		---		---		---		---		260.4		315		145.7		---		---		---		---		---

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		13.7		6.1		9.3		12.8		16.7		20.7		23.4		21.5		18		13.9		10.3		6.9		4.7

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.6		0.1		0.6		2		3.9		5.5		6.2		5.4		3.7		2.3		1		0.2		---

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.3		0.1		0.4		1.2		1.9		2.5		2.9		2.4		2.2		1.3		0.6		0.1		---

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3		0.3		1.5		3.5		5.2		5.2		5.2		4.8		3.7		3.2		2.2		0.8		---

Average 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		---		1.4		3.2		5.3		7		8		7.1		3.8		3.2		1.9		0.7		---

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.6		0.1		0.6		2		3.9		5.5		6.2		5.4		3.7		2.3		1		0.2		---

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		---		0.1		0.5		1.2		2		2.5		2.9		2.4		2.2		1.4		0.7		0.1		---

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		---		0.4		1.8		4.2		5.9		6.3		5.7		5.7		4.5		4.1		2.5		1		---

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		---		---		1.6		4		6.3		8.6		9.2		9		5.3		4.3		2.2		0.9		---

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		---		0.1		0.5		1.8		3.1		4.6		5.5		4.7		2.9		2		0.8		0.2		---

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		---		0.1		0.4		1.1		1.9		2.4		2.8		2.3		2		1.2		0.6		0.1		---

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		---		0.3		1.2		3		3.9		4.2		4.6		4.1		2.7		2.7		1.8		0.7		---

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		---		---		1		2.6		3.3		5		6.5		5.5		2.1		2.5		1.5		0.6		---