ALTDORF, SWITZERLAND

Average Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		48		32.5		35.1		40.5		47.3		55		60.1		63.5		62.1		57.2		49.5		40.3		33.8

Average High Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		56.5		39		41.9		48.7		55.9		64.8		69.6		73.4		72		66.6		57.7		47.3		40.3

Average Low Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		41.4		27.1		28.9		33.1		39.4		46.2		52		55.8		55		50.5		43.3		35.1		28.8

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		2		---		---		---		---		0.1		0.3		1		0.5		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		30.7		---		---		---		0.1		2		6.3		11.7		8.2		2.1		0.3		---		---

Average Number of Days Below 0F/-17C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		13.4		5.8		3.1		0.3		---		---		---		---		---		---		---		0.7		3.5

Average Precipitation

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		43.3		2.7		2.6		2.8		3.4		3.9		5		5.1		5.3		3.5		3		3.1		2.8

Average Number of Days With Precipitation

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		123.7		10		9.3		11		12.1		13.1		14.4		13.1		13.2		9.6		8.3		9.5		10.1

Average Number of Days With Frost

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		65.4		23.8		18.7		12.7		3.2		0.1		---		---		---		---		0.6		9.1		21

Average Number of Days With Ice

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		9.8		6.1		3.4		0.7		---		---		---		---		---		---		---		0.4		5.3

Average Relative Humidity

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Percent		77.6		81.9		78.6		73.9		71.2		71.7		73.9		74.9		78.3		79.8		81.5		82.1		83.8

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		5874.7		990.5		836.2		747.1		520.5		294.5		126		12.4		46.5		193.5		449.5		714		944

Growing Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1637.6		---		---		---		---		170.5		324		452.6		418.5		256.5		15.5		---		---

Average Station Pressure

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
inHg		28.5		28.5		28.4		28.4		28.4		28.4		28.5		28.5		28.5		28.5		28.5		28.5		28.5

Average Vapor Pressure

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
inHg		0.3		0.2		0.2		0.2		0.2		0.3		0.4		0.4		0.4		0.4		0.3		0.2		0.2

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.8		9.6		10.9		12.5		14.2		15.7		16.5		16		14.7		13		11.4		9.9		9.2

Average Monthly Sunshine

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		1289		33		65		109		134		155		157		180		164		138		106		51		30

Average Possibility of Sunshine

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Percent		44		26		36		43		43		45		45		51		49		52		49		37		27

Average Wind Speed

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mph		6		5.8		5.6		6.3		7.8		6.9		6		5.6		4.9		5.4		5.6		5.6		5.8

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.4		1.4		2.2		3.3		4.2		5.2		5.6		5.6		4.8		3.5		2.2		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		1.1		1.7		2.1		2.5		2.6		2.6		2.2		1.7		1.1		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		3.7		2.4		3.3		4		4.4		4.8		4.9		5		4.8		4		2.9		2.1		1.8

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.4		2.1		2.9		3.4		3.8		4.6		4.9		5		4.5		3.5		2.6		1.8		1.6

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.4		1.4		2.2		3.3		4.2		5.2		5.6		5.6		4.8		3.5		2.2		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		1.8		0.9		1.3		1.8		2.2		2.5		2.7		2.6		2.3		1.9		1.4		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		4.5		2.8		4.3		5		5.4		6.1		5.6		5.8		5.5		5.3		3.8		2.7		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		4.6		2.5		3.9		4.6		5.6		6.9		6.2		6.5		5.7		5.3		3.7		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		2.6		1.1		1.5		2.6		3.1		4.5		4.4		4.8		4		2.3		1.5		0.9		0.7

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.5		0.7		0.9		1.6		2		2.4		2.6		2.5		2.2		1.5		0.9		0.6		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		2.7		1.8		2.1		3		3.1		4.1		3.9		4.3		3.8		2.4		1.8		1.2		1.1

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.1		1.5		1.7		2.3		2		3.3		2.9		3.6		2.9		1.6		1.4		0.9		0.9