HALEAKALA SUMMIT, HAWAII

Average Temperature

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		8.2		6.3		5.8		6.4		7.2		8.3		10.1		9.7		10.2		10.1		9.5		8.1		6.7

Average High Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		11.7		7.3		9.9		10.5		11.2		12.6		14.6		14.3		14.7		14.2		13.8		10.3		6

Average Low Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		3.7		0.9		2.3		2.5		3		3.9		5.6		5.4		5.7		5.6		5.2		3.1		-0.1

Highest Recorded Temperature

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		22.8		20.6		20.6		19.4		20		21.1		22.8		18.9		21.1		20		20		18.3		20.6

Lowest Recorded Temperature

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-10		-10		-9.4		-6.7		-9.4		-0.6		-1.1		-2.2		-1.7		-3.9		-3.3		-2.2		-5.6

Average Number of Days Below 32F/0C

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		30.8		6.9		9.4		5.5		2.6		0.3		0.2		0.4		0.1		0.2		0.5		0.5		4.1

Average Precipitation

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1047		199		108		113		116		60		11		27		56		41		35		119		160

Average Number of Days With Precipitation

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		90		9		8		10		10		7		3		6		6		6		7		10		8

Most Reported Precipitation in a Month

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		568		463		332		397		484		210		68		72		283		152		92		238		568

Least Reported Precipitation in a Month

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		---		2		7		2		---		---		---		2		3		6		1		3		3

Most Precipitation Reported in a Day

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		208.3		95.2		87.1		153.7		112.5		102.6		38.1		36.8		208.3		70.9		30.5		104.1		143

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

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		52		6		6		6		6		4		1		3		3		3		3		6		5

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

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		20		3		3		2		3		2		---		---		1		1		1		2		2

Avg. No. of Days w/Precip. Above 1in/25mm

Years on Record: 19

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

Average Snowfall

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		0.5		---		0.5		---		---		---		---		---		---		---		---		---		---

Most Snow Reported in a Month

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		7.6		---		7.6		---		---		---		---		---		---		---		---		---		---

Heating Degree Days

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1677.8		202.2		198.3		198.3		168.3		137.8		81.7		95.6		83.3		81.7		103.3		140		187.2

Growing Degree Days

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		11.8		---		---		---		---		---		3.3		---		5.2		3.3		---		---		---

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.5		11.4		11.9		12.4		13		13.5		13.8		13.6		13.2		12.6		12		11.5		11.3

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		21.7		15.7		18.7		21.8		24.7		26.1		26.9		26.4		25.7		23.7		20.2		16.3		14.7

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.6		4.4		4.9		5.8		6.4		6.9		6.7		6.8		6.3		5.5		4.9		4.5		4.2

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		22.8		19.3		21.5		23		23.9		23.8		27		26.1		24.2		24.3		22.7		19.7		17.7

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		25.2		21.3		23.3		24.7		26.5		27.5		29.1		28		28		27.2		25		21.5		20.4

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		21.7		15.7		18.7		21.8		24.7		26.1		26.9		26.4		25.7		23.7		20.2		16.3		14.7

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		6.5		5.2		6		6.8		7.8		7.8		7.3		7.6		7.2		6.8		5.9		5.3		4.7

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		25.1		22.2		24.8		25.7		26		25.3		28.2		28.4		26.2		26.1		24.8		21.9		20.9

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		29.7		26.4		29.4		29.7		30.9		31		31.6		32.7		32.6		31		29		25.4		26.6

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		19		12.4		15.3		18.7		20.6		23.7		25.3		24.4		23.4		20.5		17.7		13.4		12.9

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		4.8		3.6		3.8		4.8		5.5		6.1		6.2		5.8		5.2		4.8		4.1		3.9		3.2

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		19.6		14.5		17		19.5		19.9		21.9		25.3		24.1		22.1		20.8		19.5		15.6		15.2

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		19.4		13.5		15.7		18.3		18.5		22.9		25.9		24.1		23.3		20.4		19.4		14.6		15.9