DUTCH HARBOR, ALASKA

Average Temperature

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		41		32		32		34		36		41		47		52		54		49		42		37		34

Average High Temperature

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		46		36		36		38		41		46		52		57		60		54		47		41		38

Average Low Temperature

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		36		28		27		29		31		36		41		46		47		44		37		32		29

Highest Recorded Temperature

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		80		58		60		69		61		66		72		79		80		80		63		67		56

Lowest Recorded Temperature

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		5		6		5		5		13		20		30		36		28		29		22		16		10

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
in.		54.7		5.9		6.6		4.5		4.2		4.4		2.7		1.7		2.1		4.7		7.4		5.4		6.2

Average Precipitable Water

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		0.5		0.3		0.3		0.3		0.3		0.4		0.6		0.8		0.9		0.6		0.4		0.3		0.3

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
in.		7.6		2.8		7.6		2.5		3.5		3.6		3		4		2.1		2.4		3.2		4.7		2.1

Most Rain Reported in a Month

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		83		14		22.2		12.2		8.1		11.1		6.2		5.8		4.3		10.2		16		11.8		15.6

Least Rain Reported in a Month

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		5.4		0.7		0.9		---		---		0.2		0.1		---		0.1		---		0.1		0.1		0.6

Average Snowfall

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		71.9		18.4		18.8		10.7		7.6		0.2		---		---		---		---		0.2		6		14.6

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
in.		56		27		56		56		15		1		---		---		---		---		---		5		20

Most Snow Reported in a Day

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		89.7		28		7.1		5.5		1.9		---		---		---		---		1.5		5.5		12.2		28

Most Snow Reported in a Month

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		191		52.6		57.2		39.1		18		2		---		---		---		---		1.5		20.2		33.5

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
%		84.7		81.2		83.3		84.4		85		85.9		87.3		89.2		87.2		84.8		81.5		81.5		82.1

Average Evening Relative Humidity

Years on Record: 7

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		79.3		79.8		81.1		78.6		79.1		78.2		80		80.7		79.6		78.8		77.1		78.3		80.3

Average Dew Point

Years on Record: 7

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		35		26		26		27		31		35		40		46		48		42		36		31		28

Average Wet Bulb

Years on Record: 7

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		38		29		29		30		34		38		43		48		50		44		39		34		31

Heating Degree Days

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		9999.9		1147		1064		1080		1020		899		720		589		558		630		868		990		1116

Growing Degree Days

Years on Record: 29

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		155		---		---		---		---		---		---		46.5		108.5		---		---		---		---

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
%		89.2		84.1		91.6		85.6		91.1		92.5		88.8		93		87.6		93.5		89		86.5		86.4

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
kWh/m2		2.5		0.7		1.3		2.5		3.6		4.5		4.5		4		3.3		2.7		1.7		0.9		0.6

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.5		0.5		0.8		1.5		2.1		2.6		2.7		2.6		2.1		1.5		1		0.6		0.4

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.8		1.3		2.1		3.1		3.8		4.1		3.9		3.5		3.2		3.1		2.5		1.5		1.2

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.3		1.1		1.8		2.6		3.2		3.5		3.3		2.5		2.3		2.7		2.3		1.3		1.1

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.5		0.7		1.3		2.5		3.6		4.5		4.5		4		3.3		2.7		1.7		0.9		0.6

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.6		0.5		0.9		1.5		2.1		2.6		2.8		2.7		2.3		1.6		1.1		0.6		0.4

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.4		1.5		2.5		3.7		4.9		4.9		4.7		4.3		4		3.6		3.1		1.7		1.3

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.2		1.3		2.3		3.4		5		5.1		4.8		4		3.5		3.3		2.9		1.6		1.2

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.1		0.6		1.1		2.1		3.1		3.8		3.9		3.3		2.9		2.3		1.5		0.7		0.5

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.4		0.4		0.7		1.4		2		2.5		2.6		2.3		2		1.5		0.9		0.5		0.4

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.3		1		1.6		2.5		3.2		3.4		3.4		2.9		2.7		2.6		2.1		1.2		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		1.7		0.8		1.3		1.9		2.3		2.4		2.2		1.7		1.7		2		1.8		1		0.9