AIRWAY HEIGHTS, WASHINGTON

Average Temperature

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		8.9		-2.6		0.1		4.1		8.5		12.9		16.7		21.1		20.4		15.3		9.1		2.4		-1.4

Average High Temperature

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		14.4		0.6		3.9		9		14.5		19.4		23.4		28.9		28.2		22.5		15.1		6		1.4

Average Low Temperature

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		3.3		-5.7		-3.8		-0.8		2.5		6.5		10.1		13.3		12.6		8.1		3.1		-1.2		-4.3

Highest Recorded Temperature

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		42.2		16.7		17.2		22.2		32.2		36.1		38.3		42.2		42.2		36.7		30.6		21.1		15.6

Lowest Recorded Temperature

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-31.7		-31.1		-31.1		-23.3		-10		-4.4		0.6		2.8		1.7		-5.6		-13.9		-29.4		-31.7

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
mm		409		50		39		36		28		36		31		14		16		20		30		53		57

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
mm		149		126		143		97		101		145		106		60		54		142		137		149		130

Least Reported Precipitation in a Month

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		---		10		1		3		2		2		---		---		---		---		---		---		14

Most Precipitation Reported in a Day

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		55.6		32		27.9		24.4		31.2		55.6		42.2		27.4		36.6		38.4		35.8		35.8		35.3

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
cm		105.7		32.8		18.8		8.9		1.5		0.2		---		---		---		---		0.5		13.7		29.2

Average Snow Cover

Years on Record: 109

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		2		7		5		---		---		---		---		---		---		---		---		---		5

Most Snow Reported in a Month

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		156.2		144.5		96		41.7		16.8		8.9		---		---		---		3.6		15.5		65.8		156.2

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		3788.9		649.4		508.9		438.9		309.4		187.8		82.8		24.4		23.3		108.9		307.8		498.3		648.9

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		218.9		---		---		---		0.6		6.1		25.6		86.1		85.6		14.4		0.6		---		---

Growing Degree Days

Years on Record: 122

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1117.8		---		---		---		---		91.3		201.7		342.7		322.1		160		---		---		---

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
Mj/m2		13.5		4.8		8.1		12.5		16.7		19.6		21.5		24		21		15.5		9.3		4.9		3.9

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		6.2		2.8		4.2		6.2		7.6		9		9.5		9.5		8.2		6.8		4.6		2.9		2.4

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.9		8.1		12.6		15.6		17.5		18		18.6		21.4		21		18.2		12.8		8.1		7.1

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.7		7.3		11.1		13.9		16.7		18		19.8		24		22.5		17.8		12.1		6.9		6.3

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.5		4.8		8.1		12.5		16.7		19.6		21.5		24		21		15.5		9.3		4.9		3.9

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		6.7		3.1		4.5		6.6		7.7		9.1		9.7		11.3		9		7.6		5.3		3.3		2.6

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		17.5		9.2		14		18.7		19.9		21.5		21.2		25.2		23.4		22.1		16.3		10.4		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		17.9		8.4		12.4		17.1		20.6		24.2		24.8		28.1		25.2		22.3		16.1		8.9		7.2

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.8		4.3		6.1		11.2		14		16.1		18.3		16.1		17.1		11.6		7.3		3.9		3.2

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.8		2.6		3.5		5.9		7.5		8.8		9.4		9.1		7.9		6		4		2.5		2

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		11.7		7.2		9.1		14.1		14.3		14.7		15.9		14.3		16.9		13		9.8		5.9		5.5

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10		6.4		7.5		11.7		11.7		11.9		14.2		11.3		16		11.2		8.8		4.8		4.6