VIANA DO CASTELO, PORTUGAL

Average Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		58.6		49.1		50.9		53.6		56.1		59.7		65.5		68.9		68.5		66		60.3		54.5		51.3

Average High Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		67.6		57.7		59.4		63		64.6		68		74.8		78.8		78.8		75.9		69.3		63.1		59.2

Average Low Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		49.6		40.5		42.4		44.4		47.5		51.4		55.9		59.2		58.3		56.1		51.4		45.9		43.3

Highest Recorded Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		101.5		73.4		77		83.5		88.9		93.7		101.5		100.4		100.8		97.5		91		79.2		76.3

Lowest Recorded Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		24.8		25		26.8		30		30.9		33.4		40.5		47.7		46.4		38.8		36.3		28.6		24.8

Average Number of Days Above 90F/32C

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		8		---		---		---		---		---		1		3		2		2		---		---		---

Average Number of Days Above 86F/30C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		20.3		---		---		---		0.1		0.6		3.8		6.7		5.2		3.5		0.4		---		---

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		66.6		---		---		1.4		2.2		3.9		10.8		15.5		16.6		11.6		4.3		0.3		---

Average Number of Days Above 65F/18C

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		179		1		2		7		11		16		25		30		31		28		18		8		2

Average Number of Days Below 32F/0C

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		9		4		1		---		---		---		---		---		---		---		---		---		3

Average Precipitation

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		57.9		7.5		6.6		4.1		4.6		4.2		2.2		1.1		1.2		3.8		6.5		7.1		9

Average Number of Days With Precipitation

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		153.6		16.3		15		13.9		15.3		14.5		9.2		6.6		6.5		9		15		15		17.3

Most Precipitation Reported in a Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		7		2.7		3.5		2.6		2.3		2.1		2.5		1.4		2.5		7		3.7		2.8		3.8

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

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		52.4		7.2		6.2		3.9		4.6		3.7		1.8		1.1		1		2.9		5.6		6.3		8.1

Average Number of Days With Thunderstorms

Years on Record: 18

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

Most Rain Reported in a Month

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		71.4		17		14.1		13.6		11.3		8.7		3.9		2.5		2.1		13.1		19		15.5		20.7

Least Recorded Rainfall

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		33.7		0.9		1.3		0.1		0.8		0.4		---		---		---		---		0.3		---		0.4

Avg. No. of Days w/Rain Above 0.1in/2mm

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		120.1		14.2		12.8		10.4		12		11.3		6.6		4.1		3.6		6.5		11.7		12.4		14.5

Average Morning Relative Humidity

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		90		91		89		88		86		88		89		90		91		91		91		92		89

Average Evening Relative Humidity

Years on Record: 15

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		64		69		69		64		62		62		62		60		59		60		66		70		71

Average Dew Point

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		51		43		45		46		47		51		56		59		59		58		53		49		46

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2559.8		492.9		398.3		350.3		268.5		164.3		---		---		---		---		144.2		315		426.3

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		274.6		---		---		---		---		---		10.5		124		110.1		30		---		---		---

Growing Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		3221.6		---		25.4		114.7		181.5		300.7		460.5		589		575.1		480		320.9		135		38.8

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.7		10.1		11.1		12.4		13.9		15.1		15.7		15.4		14.3		12.9		11.5		10.3		9.7

Average Number of Days With Fog

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		281		24		20		22		20		24		24		26		26		24		24		23		24

Average Wind Speed

Years on Record: 17

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

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.1		1.7		2.5		3.8		5.1		6.1		6.8		6.8		6		4.6		2.9		1.9		1.4

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.4		0.7		1		1.4		1.8		2.2		2.2		2.1		1.8		1.5		1.1		0.8		0.6

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.6		2.9		3.6		4.7		5.3		5.6		5.9		6		5.9		5.3		3.9		3		2.6

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		3.7		4.8		5.5		6.2		7.1		7.4		6.9		5.7		3.9		3		2.6

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.1		1.7		2.5		3.8		5.1		6.1		6.8		6.8		6		4.6		2.9		1.9		1.4

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		0.7		1.1		1.5		2		2.3		2.4		2.3		2		1.7		1.2		0.8		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		5.7		4.6		5.1		6.7		6.5		6.4		6.5		6.7		6.4		6.1		5.2		4.6		4.1

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		7		5.3		5.9		8		7.8		8		8.7		9.1		7.9		7.2		5.7		5.2		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		3.4		1.2		1.8		2.6		3.7		5.3		6		6		5.3		3.7		2.4		1.4		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		1.2		0.6		0.8		1		1.5		1.9		2		1.8		1.6		1.3		1		0.7		0.5

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.5		1.7		2.3		2.9		3.7		4.9		5.2		5.4		5.2		4.1		3.1		2		1.2

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		1.4		1.9		2.3		2.9		4.8		5.5		5.9		5.4		3.8		2.7		1.7		1