KOYUKUK NATIONAL WILDLIFE REFUGE, ALASKA

Average Temperature

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-4.4		-23.3		-21.4		---		-4.6		6.8		14.7		15.8		12.6		5.9		-5.3		-16		-23.3

Average High Temperature

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		1		-18.3		-15.7		---		2.1		12.8		20.7		21.4		18		10.8		-1.3		-11.7		-18.6

Average Low Temperature

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-9.9		-28.2		-27.1		---		-11.2		0.8		8.6		10.3		7.2		1.1		-9.3		-20.3		-28.1

Highest Recorded Temperature

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		32.2		4.4		3.3		16.7		25.6		32.2		32.2		30		24.4		14.4		7.8		3.3		32.2

Lowest Recorded Temperature

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-55.6		-55.6		-54.4		-37.8		-22.2		-1.7		-1.1		-4.4		-15.6		-32.2		-46.7		-54.4		-55.6

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
mm		308		21		18		26		8		6		22		48		59		34		23		16		28

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
mm		152		113		73		152		80		22		94		130		148		108		63		35		140

Least Reported Precipitation in a Month

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		---		---		---		---		---		---		---		---		6		---		3		---		---

Most Precipitation Reported in a Day

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		127		79.2		38.1		52.3		38.6		13.2		48.8		63.5		51.6		35.6		27.9		25.9		127

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
cm		43.9		16.3		3.8		4.8		0.8		---		---		---		---		1		5.1		7.4		4.8

Average Snow Cover

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		22		45		55		63		50		7		---		---		---		---		5		15		27

Most Snow Reported in a Month

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		127.5		127.5		17.8		25.4		6.9		0.5		---		---		---		10.2		25.4		13.7		10.2

Heating Degree Days

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		6495		1117.8		963.9		877.8		521.1		188.3		20.6		11.1		44.4		207.8		561.1		863.9		1117.2

Cooling Degree Days

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		27.8		---		---		---		---		---		8.3		16.7		2.8		---		---		---		---

Growing Degree Days

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		400.6		---		---		---		---		144.7		175		80.9		---		---		---		---		---

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
Mj/m2		9.2		0.2		2.2		7.1		13.9		19.6		22.3		19.5		13.3		8.2		3.5		0.6		---

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		4.6		0.2		1.5		4.1		6.8		8.8		10.4		8.6		7.8		4.6		2.3		0.5		---

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.7		1.1		5.5		12.6		18.6		18.8		18.8		17.4		13.5		11.5		7.8		2.9		---

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		12.5		---		4.9		11.4		18.9		25.3		28.8		25.4		13.6		11.5		6.8		2.5		---

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		9.2		0.2		2.2		7.1		13.9		19.6		22.3		19.5		13.3		8.2		3.5		0.6		---

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		---		0.2		1.6		4.5		7.1		8.9		10.5		8.8		7.9		5		2.5		0.5		---

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		---		1.4		6.5		15.2		21.2		22.8		20.3		20.3		16.3		14.7		9		3.5		---

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		---		---		5.9		14.3		22.6		30.9		33		32.5		18.9		15.6		8		3.1		---

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		---		0.2		1.8		6.3		11.3		16.5		19.7		16.8		10.3		7.2		3		0.6		---

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		---		0.2		1.3		3.9		6.7		8.7		10.2		8.3		7.3		4.4		2		0.4		---

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		---		1		4.4		10.7		14.2		15.2		16.6		14.8		9.9		9.6		6.3		2.4		---

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		---		---		3.7		9.3		12		17.9		23.2		19.8		7.4		9.1		5.4		2		---