LANG SON, VIETNAM

Average Temperature

Years on Record: 34

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		21		13		14		17		22		26		27		27		27		25		22		18		15

Average High Temperature

Years on Record: 34

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		26		17		18		21		26		30		31		31		31		30		27		23		20

Average Low Temperature

Years on Record: 34

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		17		10		11		14		18		22		23		23		23		21		18		14		11

Highest Recorded Temperature

Years on Record: 39

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		40		31		36		36		38		40		36		37		37		36		34		32		31

Lowest Recorded Temperature

Years on Record: 38

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-1		-1		---		5		6		11		16		19		18		13		7		2		---

Average Number of Days Above 90F/32C

Years on Record: 7

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		77		---		---		---		2		12		16		17		17		7		2		---		---

Average Number of Days Below 32F/0C

Years on Record: 7

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Average Precipitation

Years on Record: 38

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1410		20		50		50		80		160		190		270		270		150		80		30		20

Average Number of Rainy Days

Years on Record: 38

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		84		1		3		3		5		5		12		15		14		9		6		4		2

Average Relative Humidity

Years on Record: 7

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		81		73		79		82		82		79		81		83		85		85		81		82		79

Average Dew Point

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		17		8		11		14		18		22		23		23		24		22		19		15		11

Heating Degree Days

Years on Record: 34

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		395.6		137.8		94.2		8.6		---		---		---		---		---		---		---		---		86.1

Cooling Degree Days

Years on Record: 34

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1606.2		---		---		---		125		249.7		266.7		284.2		284.2		225		146.4		25		---

Growing Degree Days

Years on Record: 34

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		4461.1		120.6		141.3		249.7		375		508.1		516.7		542.5		542.5		475		404.7		275		172.2

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		11.8		12.4		13		13.6		13.9		13.7		13.2		12.6		12		11.5		11.2

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.4		8.5		9.7		12		13.7		15.7		16.3		16.6		16.4		15.3		13.6		12.1		10.8

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		7.1		4.9		5.8		7		8		8.8		8.9		8.8		8.3		7.5		6.4		5.3		4.7

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.6		9.3		10.3		12.2		13.2		14.7		15.9		15.4		15.6		15.4		14.7		14		12.6

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.1		6.9		6.6		7.7		8.2		9.9		10.6		11.2		11.7		11.7		12		12.5		12.1

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.4		8.5		9.7		12		13.7		15.7		16.3		16.6		16.4		15.3		13.6		12.1		10.8

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		7.2		5.2		6.1		7.3		8.3		8.9		9		8.9		8.4		7.6		6.5		5.4		4.9

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		16.9		12.5		13.1		16.7		15.7		16.3		18.6		17.6		18.6		18.7		18.4		17.8		18.6

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15		11.3		10		13.8		11.6		12.3		14.3		14.9		16.7		16.9		17.7		18.4		22.2

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.2		5.7		7.1		9.8		10.4		12.8		13.1		12.1		12.1		12.2		10.9		8.2		7.4

Minimum 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		4.1		5.1		6.6		7.3		8.3		8.5		8.2		7.9		7.2		6		4.8		3.8

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.1		5.8		7.3		9.8		10		12.2		12.8		11.4		11.5		12.1		11.5		8.9		8

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.5		2.9		3.5		4.9		4.5		6.5		6.7		5.6		6.1		7.3		7.6		5.7		5.5