COLOMBO, SRI LANKA

Average Temperature

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		27		27		27		28		28		28		28		28		28		28		27		27		27

Average High Temperature

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		30		30		30		31		31		30		30		29		29		29		29		29		30

Average Low Temperature

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		25		23		24		25		26		26		26		26		26		26		25		25		24

Highest Recorded Temperature

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		40		37		40		33		40		36		40		38		39		38		38		38		38

Lowest Recorded Temperature

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		15		17		18		20		21		21		15		20		17		20		17		18		17

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
mm		2230		80		60		110		250		330		190		120		90		150		350		300		150

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
mm		3910		330		260		350		840		850		500		710		490		630		890		730		540

Least Recorded Rainfall

Years on Record: 120

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1140		---		---		---		40		20		10		---		---		---		40		20		---

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
C		23		21		21		22		23		24		23		23		23		23		23		22		22

Cooling Degree Days

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		3678.5		258.3		258.9		310		308.3		318.6		300		301.4		292.8		283.3		284.2		266.7		275.6

Growing Degree Days

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		6928.9		516.7		494.4		568.3		558.3		576.9		550		559.7		551.1		533.3		542.5		516.7		533.9

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
km/h		9		8		9		9		8		8		9		9		9		9		8		8		8

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		17.9		16.9		20.2		21.9		19.9		18.4		16.9		17.1		17.8		18		16.8		15.6		15.4

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		7.4		6.6		6.7		7.2		8		7.9		7.7		7.8		8.1		8.1		7.6		7		6.5

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		18		17.5		20.6		21.8		19.7		18.3		17		17		17.6		17.7		16.9		15.9		16

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15.5		16.3		20.3		20.9		16.9		15.2		13.6		13.6		13.8		14		13.5		13.5		14.4

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		17.9		16.9		20.2		21.9		19.9		18.4		16.9		17.1		17.8		18		16.8		15.6		15.4

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		7.7		7		7.4		8		8.4		8		7.8		7.9		8.2		8.2		7.7		7.1		6.7

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		20.9		20.9		24.7		24.6		21		19.9		19.6		19.9		20.1		20.9		21.5		18.3		19.6

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		20.6		22.6		28.1		26.3		19.1		17.9		17.9		18.4		17.9		19.4		21.4		17.4		20.7

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.7		13.6		12.1		18.3		16.7		17		14.4		14.5		15.8		14.8		14.8		12.4		11.8

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		6.8		5.8		5.3		6.3		7.8		7.6		7.4		7.4		7.7		7.5		6.7		6.7		5.9

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.7		14		12.2		18.2		16.4		16.9		14.4		14.4		15.7		14.6		14.8		12.6		12.1

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.3		10.7		7.2		14.7		11.7		12.9		9.8		9.7		10.9		9.4		10.4		8.5		8.4