ST. HELENA, SAINT HELENA

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Elevation: 435 meters Latitude: 15 56S Longitude: 005 40W

WEATHER

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Climate Summary

CURRENT CONDITIONS

Sunrise/Set

02:33 am

02:07 pm
Local Time
5:46 pm EDT
27 April, 2024

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MONTHLY - ALL WEATHER AVERAGES [ Show Summary ]

[ °F ] °C

TEMPERATURE

Average Temperature

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		18		20		21		21		20		19		17		16		16		16		16		17		18

Average High Temperature

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		19		21		22		22		21		20		18		17		17		17		17		18		20

Average Low Temperature

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		17		18		19		19		18		17		16		15		15		15		15		16		17

Highest Recorded Temperature

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		32		32		28		30		32		29		28		26		26		26		25		27		28

Lowest Recorded Temperature

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		11		15		15		15		16		13		12		11		11		11		11		13		13

Average Number of Days Below 75F/23C

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		365		31		28		31		30		31		30		31		31		30		31		30		31

Average Number of Days Below 65F/18C

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		272		20		5		4		9		22		30		31		31		30		31		30		30

PRECIPITATION

Average Number of Days With Precipitation

Years on Record: 14

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		212		15		18		18		15		16		16		18		20		18		21		19		18

PRECIPITATION - RAIN

Average Number of Rainy Days

Years on Record: 14

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		212		15		18		18		15		16		16		18		20		18		21		19		18

HUMIDITY

Average Morning Relative Humidity

Years on Record: 14

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		87		89		90		89		88		85		84		84		85		85		86		87		87

Average Evening Relative Humidity

Years on Record: 7

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		77		76		76		77		78		77		77		78		79		78		78		77		75

Average Dew Point

Years on Record: 11

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		15		16		17		17		17		15		14		13		12		13		13		13		15

DEGREE DAYS

Heating Degree Days

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		289.2		---		---		---		---		---		16.7		51.7		68.9		58.3		60.3		33.3		---

Cooling Degree Days

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		299.4		51.7		70.6		77.5		58.3		25.8		---		---		---		---		---		---		8.6

Growing Degree Days

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		3260.8		310		306.1		335.8		308.3		284.2		233.3		206.7		189.4		191.7		198.1		216.7		266.9

SKY CONDITIONS

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.5		13.3		13		12.5		12.1		11.7		11.6		11.7		12		12.4		12.8		13.2		13.5

Average Number of Days With Fog

Years on Record: 14

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		48		4		5		4		3		2		4		4		5		5		4		4		4

Average Number of Days With Smoke/Haze

Years on Record: 14

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		9		---		---		---		1		1		1		2		1		1		1		1		---

Average No. of Days With Vision Obstruction

Years on Record: 14

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		60		4		5		5		4		3		5		6		6		7		5		5		5

WIND

Average Wind Speed

Years on Record: 11

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
km/h		25		22		22		25		22		22		25		27		27		27		27		25		25

Average No. of Days With Blowing Dust/Sand

Years on Record: 14

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		60		4		5		5		4		3		5		6		6		7		5		5		5

SOLAR RADIATION

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		20.6		25.8		26.1		24.1		21		18.1		16.1		16.1		17		18.4		19.8		21.3		23.5

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		6.5		7.5		6.9		6.2		5.3		4.6		4.4		4.8		5.8		7.1		8.2		8.6		8.2

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		21.3		25.3		24.8		24.1		22.5		20.6		18.9		18.4		18.5		18.7		19.1		20.7		23.9

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		21.6		26.2		27.3		26		24.5		23.1		21.3		19.9		18.1		16.7		16.5		18.1		22.1

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		20.6		25.8		26.1		24.1		21		18.1		16.1		16.1		17		18.4		19.8		21.3		23.5

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		7.1		8.4		8.3		7.2		6.3		5		5.1		5.4		6.3		7.5		8.4		9		8.8

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		27.8		26.4		26.2		24.5		22		21.1		21.5		20.3		20.8		21.4		23.4		26.9

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		25.9		31.1		31		30.2		28.3		25.9		25.4		25.6		21.3		20.4		20.6		22.9		27.4

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		18.2		23		22		21.4		18.2		16.9		13.8		13.9		15		15.9		18.2		18.8		20.9

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.8		6.5		6.2		5.3		4.5		4.1		3.7		3.8		5.4		6.6		7.7		8		7.3

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		18.6		22.6		20.9		21.4		19.4		19.1		15.7		15.6		16.1		16.2		17.6		18.2		21.2

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		16.9		21		19.4		20.6		18.7		20.3		15.6		15		14.1		12.6		14		14		17.5

NEARBY - MAP

NEARBY - LIST

Jamestown, Saint Helena (5 mi / 8 km)

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St. Helena, Saint Helena