PORTSMOUTH, VIRGINIA

Average Temperature

Years on Record: 64

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		60		40.7		42.1		49.1		58.3		66.7		74.9		79.1		77.8		72.3		61.9		52.6		43.9

Average High Temperature

Years on Record: 64

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		68.5		48.9		50.8		58.2		68.1		75.8		83.6		87.3		85.6		80		70.3		61.3		52.3

Average Low Temperature

Years on Record: 64

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		51.4		32.6		33.4		40		48.4		57.5		66.2		70.9		70.1		64.7		53.6		43.8		35.6

Highest Recorded Temperature

Years on Record: 64

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		105		80		82		88		97		100		101		105		104		99		95		86		80

Lowest Recorded Temperature

Years on Record: 64

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		-3		-3		8		18		28		36		45		54		49		45		27		20		7

Average Number of Days Above 100F/38C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		0.4		---		---		---		---		---		---		0.3		0.1		---		---		---		---

Average Number of Days Above 90F/32C

Years on Record: 64

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		32.2		---		---		---		0.4		1.6		6.8		11.9		8.8		2.5		0.1		---		---

Average Number of Days Above 80F/26C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		121.7		---		---		1		5.5		14.1		22.8		30		27.6		15.5		4.4		0.8		---

Average Number of Days Above 70F/21C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		196		0.4		2		6.7		14.8		26.4		29.4		31		31		29		17.8		6.1		1.5

Average Number of Days Above 60F/15C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		258.7		6.7		6.7		14.8		25.1		30.4		30		31		31		30		28.1		17.5		7.4

Average Number of Days Above 50F/10C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		311.8		13.6		15.6		25.1		29.3		31		30		31		31		30		31		27.5		16.8

Average Number of Days Above 40F/4C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		349.4		23.4		24.7		30.4		30		31		30		31		31		30		31		29.9		27

Average Number of Days Below 70F/21C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		314.8		31		28		31		30		30		21		10.3		15		26.6		31		30		31

Average Number of Days Below 60F/15C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		234.7		31		27.9		30.7		27.9		19.7		3.4		0.4		0.6		7.5		25.1		29.6		30.9

Average Number of Days Below 50F/10C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		172.8		30		27.4		27.4		18.1		4.6		---		---		---		0.4		11.9		23.1		29.9

Average Number of Days Below 40F/4C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		102.9		24.9		23		15.7		2.4		0.1		---		---		---		---		1.9		10.8		24.1

Average Number of Days Below 32F/0C

Years on Record: 64

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		50.4		15.8		13.3		5.6		0.2		---		---		---		---		---		0.1		2.8		12.5

Average Number of Days Below 20F/-6C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		3.1		1.9		0.4		0.1		---		---		---		---		---		---		---		---		0.6

Average Precipitation

Years on Record: 64

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		45.6		3.5		3.2		3.7		3.1		3.6		3.9		5.3		5.4		4.5		3.3		3.1		3.2

Average Number of Days With Precipitation

Years on Record: 64

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		116		11		10		11		10		10		9		11		10		8		8		9		9

Most Precipitation Reported in a Day

Years on Record: 64

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		8.9		3.7		4.8		3.8		5.9		3.4		5.8		4.7		7.4		8.9		6.2		4.9		2.8

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

Years on Record: 64

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		75		7		6		7		6		7		6		7		7		5		5		5		6

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

Years on Record: 64

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		30		2		2		3		2		3		2		3		3		2		2		2		2

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

Years on Record: 64

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		11		1		1		1		1		1		1		2		2		1		1		1		1

Most Rain Reported in a Month

Years on Record: 64

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		65		9.9		8.2		10.4		7.2		10.1		10.5		14.4		14.3		13.8		10.1		9.2		7.6

Least Rain Reported in a Month

Years on Record: 64

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		26.5		1.1		0.6		0.5		0.4		0.6		0.4		0.4		0.7		0.3		---		0.1		0.7

Average Snowfall

Years on Record: 64

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		7.8		2.9		2.8		1		---		---		---		---		---		---		---		---		1.1

Most Snow Reported in a Month

Years on Record: 64

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		41.9		14.2		24.4		13.7		1.2		---		---		---		---		---		---		0.6		17.8

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		3282		752		610		466		207		52		2		---		---		8		145		379		662

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1663		---		1		6		39		141		331		466		401		220		50		7		---

Growing Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		4824		30		36		114		293		553		778		931		866		662		375		143		41

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.7		10.5		11.3		12.4		13.6		14.7		15.2		14.9		14		12.8		11.6		10.7		10.2

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.4		2.2		3		4.2		5.4		6.1		6.5		6.2		5.7		4.7		3.8		2.6		2.1

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.6		0.9		1.2		1.5		1.9		2.2		2.3		2.3		2		1.6		1.2		0.9		0.8

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.8		3.4		4		4.9		5.4		5.6		5.6		5.6		5.5		5.2		5		3.9		3.4

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5		3.6		4		4.9		5.6		5.9		6.2		6		5.9		5.4		5.3		4.1		3.5

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.4		2.2		3		4.2		5.4		6.1		6.5		6.2		5.7		4.7		3.8		2.6		2.1

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.7		0.9		1.2		1.6		2.1		2.4		2.5		2.4		2.2		1.8		1.3		1		0.8

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5.6		4		4.7		5.7		6.3		6.5		6.1		6.1		6.2		6.1		6.2		4.9		4.2

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		6.4		4.4		5.2		6.2		7.2		8.1		7.4		7.3		7.2		6.8		7.2		5.6		4.7

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.5		1.8		2.3		3.6		4.2		4.2		5.4		5.3		4.7		4		3.2		2		1.5

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		0.8		1.1		1.4		1.7		1.9		2.2		2.1		1.8		1.4		0.9		0.8		0.7

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.7		2.5		2.7		4		4.2		3.9		4.8		4.8		4.5		4.3		4.1		2.7		2.2

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.3		2.2		2.3		3.5		3.4		2.8		4.4		4.4		3.9		3.8		3.9		2.5		2