COLOMBO, SRI LANKA

Average Temperature

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		82		81		82		83		84		84		83		83		83		83		82		81		81

Average High Temperature

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		86		86		87		88		88		87		86		85		85		85		85		85		86

Average Low Temperature

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		78		74		76		78		79		80		80		80		79		79		78		77		76

Highest Recorded Temperature

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		104		100		104		92		104		97		104		102		103		102		101		102		102

Lowest Recorded Temperature

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		60		63		66		68		70		70		60		68		63		68		64		66		64

Average Number of Days Above 86F/30C

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		259		23		23		29		27		24		21		18		17		18		18		19		20

Average Number of Days Below 75F/23C

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		128		21		17		14		8		4		4		4		4		6		11		16		19

Average Precipitation

Years on Record: 120

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		87.8		3.3		2.5		4.5		10		13.2		7.5		5.1		3.8		6.2		13.9		12.1		6

Average Number of Days With Thunderstorms

Years on Record: 16

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		56		2		3		7		12		9		2		1		1		2		4		7		6

Most Rain Reported in a Month

Years on Record: 120

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		154.3		13.2		10.6		14.1		33.4		33.8		20		28		19.5		25.1		35.3		28.8		21.5

Least Recorded Rainfall

Years on Record: 120

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		45		---		---		---		1.8		0.8		0.6		0.3		0.1		---		1.8		0.9		0.3

Average Morning Relative Humidity

Years on Record: 11

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		89		87		90		91		91		87		86		85		85		87		91		93		91

Average Evening Relative Humidity

Years on Record: 11

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		68		59		60		62		67		72		73		72		72		72		72		70		64

Average Dew Point

Years on Record: 10

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		74		70		71		73		75		76		75		75		74		74		74		73		72

Cooling Degree Days

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		6224.6		465		466.1		558		555		573.5		540		542.5		527		510		511.5		480		496

Growing Degree Days

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		11703.4		930		889.9		1023		1005		1038.5		990		1007.5		992		960		976.5		930		961

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.5		12.1		12.3		12.4		12.6		12.8		12.9		12.8		12.7		12.5		12.3		12.2		12.1

Average Number of Days With Fog

Years on Record: 16

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		27		4		5		4		1		1		---		1		---		---		3		4		4

Average Wind Speed

Years on Record: 8

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

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5		4.7		5.6		6.1		5.5		5.1		4.7		4.7		4.9		5		4.7		4.3		4.3

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.1		1.8		1.9		2		2.2		2.2		2.1		2.2		2.2		2.3		2.1		1.9		1.8

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5		4.9		5.7		6.1		5.5		5.1		4.7		4.7		4.9		4.9		4.7		4.4		4.4

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.3		4.5		5.6		5.8		4.7		4.2		3.8		3.8		3.8		3.9		3.8		3.7		4

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5		4.7		5.6		6.1		5.5		5.1		4.7		4.7		4.9		5		4.7		4.3		4.3

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.1		1.9		2.1		2.2		2.3		2.2		2.2		2.2		2.3		2.3		2.2		2		1.9

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5.8		5.8		6.9		6.8		5.8		5.5		5.4		5.5		5.6		5.8		6		5.1		5.4

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5.7		6.3		7.8		7.3		5.3		5		5		5.1		5		5.4		6		4.8		5.8

Minimum 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		3.8		3.4		5.1		4.6		4.7		4		4		4.4		4.1		4.1		3.5		3.3

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.9		1.6		1.5		1.7		2.2		2.1		2.1		2.1		2.1		2.1		1.9		1.9		1.7

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.1		3.9		3.4		5.1		4.6		4.7		4		4		4.4		4.1		4.1		3.5		3.4

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.9		3		2		4.1		3.3		3.6		2.7		2.7		3		2.6		2.9		2.4		2.3