AIRWAY HEIGHTS, WASHINGTON

Average Temperature

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		48		27.4		32.1		39.4		47.3		55.3		62.1		69.9		68.7		59.6		48.3		36.4		29.4

Average High Temperature

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		57.9		33		39.1		48.2		58.1		67		74.2		84		82.7		72.5		59.1		42.8		34.6

Average Low Temperature

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		38		21.7		25.2		30.5		36.5		43.7		50.1		55.9		54.6		46.6		37.6		29.9		24.2

Highest Recorded Temperature

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		108		62		63		72		90		97		101		108		108		98		87		70		60

Lowest Recorded Temperature

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		-25		-24		-24		-10		14		24		33		37		35		22		7		-21		-25

Average Number of Days Above 90F/32C

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		19.5		---		---		---		---		0.3		1.8		9		7.4		1		---		---		---

Average Number of Days Below 32F/0C

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		128.4		26.3		22.4		19.3		7.8		1		---		---		---		0.5		7.3		18.2		25.6

Average Number of Days Below 0F/-17C

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		4.1		2.1		0.8		---		---		---		---		---		---		---		---		0.2		0.9

Average Precipitation

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		16.1		2		1.5		1.4		1.1		1.4		1.2		0.5		0.6		0.8		1.2		2.1		2.2

Average Number of Days With Precipitation

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		111		14		11		11		9		9		8		4		4		6		8		13		14

Most Reported Precipitation in a Month

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		5.8		5		5.6		3.8		4		5.7		4.2		2.4		2.1		5.6		5.4		5.8		5.1

Least Reported Precipitation in a Month

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		---		0.4		---		0.1		0.1		0.1		---		---		---		---		---		---		0.5

Most Precipitation Reported in a Day

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		2.2		1.3		1.1		1		1.2		2.2		1.7		1.1		1.4		1.5		1.4		1.4		1.4

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

Years on Record: 122

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

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

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		5		1		---		---		---		1		1		---		---		---		---		1		1

Average Snowfall

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		41.6		12.9		7.4		3.5		0.6		0.1		---		---		---		---		0.2		5.4		11.5

Average Snow Cover

Years on Record: 109

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		1		3		2		---		---		---		---		---		---		---		---		---		2

Most Snow Reported in a Month

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		61.5		56.9		37.8		16.4		6.6		3.5		---		---		---		1.4		6.1		25.9		61.5

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		6820		1169		916		790		557		338		149		44		42		196		554		897		1168

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		394		---		---		---		1		11		46		155		154		26		1		---		---

Growing Degree Days

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2011.9		---		---		---		---		164.3		363		616.9		579.7		288		---		---		---

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.8		9.5		10.9		12.5		14.3		15.8		16.6		16.1		14.7		13		11.3		9.8		9.1

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.7		1.3		2.3		3.5		4.6		5.5		6		6.7		5.8		4.3		2.6		1.4		1.1

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.7		0.8		1.2		1.7		2.1		2.5		2.6		2.7		2.3		1.9		1.3		0.8		0.7

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.1		2.3		3.5		4.3		4.9		5		5.2		5.9		5.8		5.1		3.6		2.2		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		4.1		2		3.1		3.9		4.6		5		5.5		6.7		6.2		4.9		3.4		1.9		1.8

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.7		1.3		2.3		3.5		4.6		5.5		6		6.7		5.8		4.3		2.6		1.4		1.1

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.9		0.9		1.3		1.8		2.1		2.5		2.7		3.2		2.5		2.1		1.5		0.9		0.7

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.9		2.6		3.9		5.2		5.5		6		5.9		7		6.5		6.1		4.5		2.9		2.2

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5		2.3		3.5		4.7		5.7		6.7		6.9		7.8		7		6.2		4.5		2.5		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		3		1.2		1.7		3.1		3.9		4.5		5.1		4.5		4.8		3.2		2		1.1		0.9

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.6		0.7		1		1.6		2.1		2.5		2.6		2.5		2.2		1.7		1.1		0.7		0.6

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.3		2		2.5		3.9		4		4.1		4.4		4		4.7		3.6		2.7		1.6		1.5

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.8		1.8		2.1		3.3		3.2		3.3		3.9		3.1		4.4		3.1		2.4		1.3		1.3