CAYENNE, FRENCH GUIANA

Average Temperature

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		26		26		26		26		26		26		26		26		26		27		27		26		26

Average High Temperature

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		29		27		28		28		28		28		28		29		30		31		30		30		28

Average Low Temperature

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		23		23		23		23		23		23		23		22		22		22		22		22		23

Highest Recorded Temperature

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		41		32		31		32		31		40		37		40		38		41		37		38		32

Lowest Recorded Temperature

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		16		20		18		16		20		20		21		17		20		18		18		18		20

Average Number of Days Above 86F/30C

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		191		5		5		9		13		14		15		21		24		26		26		22		13

Average Number of Days Below 75F/23C

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		296		23		20		21		19		24		28		29		28		26		27		26		26

Average Precipitation

Years on Record: 143

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		3200		380		320		380		380		510		390		200		100		40		50		120		290

Average Number of Days With Precipitation

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		201		21		17		22		22		27		24		19		10		5		5		11		18

Average Number of Days With Thunderstorms

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		26		1		---		---		1		2		3		4		5		4		3		2		1

Most Rain Reported in a Month

Years on Record: 143

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		5420		880		920		930		920		970		800		440		330		210		290		450		860

Least Recorded Rainfall

Years on Record: 143

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		680		60		20		10		40		---		---		---		---		---		---		---		50

Average Morning Relative Humidity

Years on Record: 14

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		96		94		92		93		94		97		98		98		97		98		98		98		97

Average Evening Relative Humidity

Years on Record: 15

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		73		77		75		75		76		78		77		72		69		65		65		68		75

Average Dew Point

Years on Record: 14

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		23		22		22		22		23		23		23		23		23		22		23		23		23

Cooling Degree Days

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		3084.7		223.9		211.9		241.1		241.7		249.7		233.3		241.1		249.7		258.3		258.3		241.7		241.1

Growing Degree Days

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		6335.2		482.2		447.3		499.4		491.7		508.1		483.3		499.4		508.1		508.3		516.7		491.7		499.4

Average Length of Day

Years on Record: 30

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

Average Number of Days With Fog

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		66		2		1		1		2		4		9		9		8		8		8		9		5

Average Wind Speed

Years on Record: 14

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
km/h		14		14		16		16		14		12		12		12		14		14		14		14		14

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		20.9		18.4		20.2		21.2		20.7		18.3		18.2		21.3		23.5		24.9		23.9		21.5		19.2

Average 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		6.6		7		7.6		7.7		7.6		7.3		6.7		6.5		6.3		5.9		5.8		6.1

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		21		18.8		20.4		21.1		20.5		18.2		18.2		21.4		23.3		24.6		24.1		22		19.7

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		20.9		18.4		19.6		19.5		18.5		15.6		16.2		21.6		24.3		26.3		26.2		24.2		20.9

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		20.9		18.4		20.2		21.2		20.7		18.3		18.2		21.3		23.5		24.9		23.9		21.5		19.2

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		7.4		7.1		7.7		8.2		8.3		7.9		7.6		7.3		7.3		7.1		6.8		6.7		6.8

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		23.5		22.1		23.4		23		24		21.6		20.7		23.5		24.9		25.7		25.7		24.4		22.7

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		25.6		24.8		25.2		23		24.9		21.4		20.6		25.7		27.5		28.8		29.6		29.1		27

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		18		15.8		17.1		18.2		14.5		13.6		15.6		19.3		21.2		22.8		21.7		19.1		16.6

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		5.7		6.1		7		6.7		6.9		6.8		5.9		5.9		5.7		5.2		4.9		5.1

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		18		16		17.2		18		14.4		13.5		15.6		19.3		21		22.5		21.9		19.5		17

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15.6		13.5		14		14.3		8.9		8.5		11.8		17.7		19.9		22.1		21.9		19.2		15.7