DUTCH HARBOR, ALASKA

Average Temperature

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		5		---		---		1		2		5		8		11		12		9		5		2		1

Average High Temperature

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		7		2		2		3		5		7		11		13		15		12		8		5		3

Average Low Temperature

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		2		-2		-2		-1		---		2		5		7		8		6		2		---		-1

Highest Recorded Temperature

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		26		14		15		20		16		18		22		26		26		26		17		19		13

Lowest Recorded Temperature

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-15		-14		-15		-15		-10		-6		-1		2		-2		-1		-5		-8		-12

Average Number of Days Above 50F/10C

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		128		1		1		1		6		20		30		31		25		9		2		1		1

Average Number of Days Below 32F/0C

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		136		23		22		23		17		6		1		---		---		1		5		16		22

Average Number of Days Below 20F/-6C

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		12		4		3		3		---		---		---		---		---		---		---		---		2

Average Precipitation

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1380		150		160		110		100		110		60		40		50		110		180		130		150

Average Precipitable Water

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm.		1.2		0.7		0.7		0.7		0.9		1.1		1.5		2.2		2.2		1.5		1		0.8		0.8

Average Number of Rainy Days

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		208		20		18		19		18		17		12		12		13		17		22		19		21

Most Rain Reported in a Day

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		190		70		190		60		80		90		70		100		50		60		80		120		50

Most Rain Reported in a Month

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		2100		350		560		300		200		280		150		140		100		250		400		290		390

Least Rain Reported in a Month

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		130		10		20		---		---		---		---		---		---		---		---		---		10

Average Snowfall

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		182		46		47		27		19		---		---		---		---		---		---		15		37

Average Number of Days With Snow

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		62		13		12		11		7		1		---		---		---		---		1		6		11

Deepest Snow Cover Reported

Years on Record: 7

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		142		68		142		142		38		2		---		---		---		---		---		12		50

Most Snow Reported in a Day

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		227		71		18		13		4		---		---		---		---		3		13		30		71

Most Snow Reported in a Month

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		485		133		145		99		45		5		---		---		---		---		3		51		85

Average Relative Humidity

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		74.5		73.1		72.2		72.1		72.9		75.4		78.1		80.2		79.1		75.8		72.4		70.8		71.9

Average Morning Relative Humidity

Years on Record: 7

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		84		81		83		84		85		85		87		89		87		84		81		81		82

Average Evening Relative Humidity

Years on Record: 7

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		79		79		81		78		79		78		80		80		79		78		77		78		80

Average Dew Point

Years on Record: 7

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		1		-3		-3		-2		---		1		4		7		8		5		2		---		-2

Average Wet Bulb

Years on Record: 7

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		3		-1		-1		-1		1		3		6		8		10		6		3		1		---

Heating Degree Days

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		5933.9		637.2		591.1		600		566.7		499.4		400		327.2		310		350		482.2		550		620

Growing Degree Days

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		86.1		---		---		---		---		---		---		25.8		60.3		---		---		---		---

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		13		8.8		10.5		12.6		14.8		16.8		17.9		17.3		15.4		13.2		11.1		9.2		8.2

Average Number of Days With Fog

Years on Record: 5

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		92		7		4		4		4		4		12		20		12		9		8		5		3

Average Possibility of Clouds

Years on Record: 7

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		89		84		91		85		91		92		88		93		87		93		89		86		86

Average Total Sky Cover

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		85.7		85.1		84.4		83.2		86.4		86.4		89.2		88.8		87.2		87		85.4		82		83.8

Average Opaque Sky Cover

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		82.9		82.5		81.8		80.9		82.9		83		86		86		84.9		84.2		81.8		78.5		80.8

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		9.1		2.4		4.8		8.9		13.1		16.1		16.3		14.3		12		9.7		6.2		3.1		2

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.5		1.7		3		5.2		7.4		9.2		9.7		9.2		7.7		5.5		3.6		2		1.4

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		4.6		7.6		11.2		13.6		14.7		14.1		12.6		11.5		11.2		9.1		5.4		4.3

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		8.3		4		6.6		9.5		11.6		12.6		11.7		9.1		8.3		9.5		8.2		4.8		3.8

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		9.1		2.4		4.8		8.9		13.1		16.1		16.3		14.3		12		9.7		6.2		3.1		2

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.7		1.8		3.3		5.5		7.5		9.3		9.9		9.7		8.1		5.7		4		2.2		1.4

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		12.1		5.4		9.1		13.4		17.7		17.7		16.9		15.5		14.4		12.9		11.1		6.1		4.8

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		11.4		4.8		8.2		12.1		18.1		18.3		17.1		14.2		12.6		11.7		10.3		5.6		4.3

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		7.7		2		3.9		7.6		11.3		13.5		13.9		11.7		10.4		8.3		5.4		2.6		1.8

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.2		1.5		2.6		4.9		7.2		8.9		9.5		8.3		7.3		5.2		3.2		1.8		1.3

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		8.2		3.5		5.8		9		11.4		12.2		12.1		10.3		9.8		9.3		7.6		4.2		3.6

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		6		2.9		4.8		6.8		8.2		8.5		7.9		6.1		6		7.2		6.6		3.5		3.1