JOHANNESBURG, SOUTH AFRICA

Average Temperature

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		16		20		20		18		16		13		10		11		13		16		17		18		19

Average High Temperature

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		21		25		23		23		20		18		15		16		18		21		22		23		24

Average Low Temperature

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		11		15		15		14		11		8		5		5		7		10		12		13		15

Highest Recorded Temperature

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		33		32		33		31		28		27		23		22		26		30		31		32		32

Lowest Recorded Temperature

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-7		7		8		2		-2		-1		-7		-5		-2		-1		2		2		8

Average Number of Days Above 80F/26C

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		44		10		6		4		1		---		---		---		---		4		6		6		7

Average Number of Days Below 45F/7C

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		81		---		---		---		3		10		22		23		15		6		2		---		---

Average Number of Days Below 32F/0C

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		6		---		---		---		---		---		3		2		1		1		---		---		---

Average Precipitation

Years on Record: 40

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		720		120		90		80		50		10		---		---		---		20		70		110		100

Average Number of Days With Precipitation

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		104		15		13		12		8		3		2		1		2		4		12		15		17

Average Number of Days With Thunderstorms

Years on Record: 15

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		69		12		8		8		4		1		1		1		1		3		8		10		12

Most Rain Reported in a Month

Years on Record: 40

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1010		330		190		210		120		80		60		60		40		170		190		230		180

Least Recorded Rainfall

Years on Record: 40

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		440		40		10		10		---		---		---		---		---		---		10		10		30

Average Relative Humidity

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		61.3		75		75		70		65		55		55		50		50		45		60		65		70

Average Morning Relative Humidity

Years on Record: 15

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		77		85		88		85		80		70		70		68		66		68		77		82		84

Average Evening Relative Humidity

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		44		52		54		53		47		38		38		34		32		34		42		49		51

Average Dew Point

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		6		12		12		11		7		2		---		---		---		3		7		10		12

Heating Degree Days

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		926.4		---		---		---		66.7		137.8		233.3		232.5		163.6		66.7		25.8		---		---

Cooling Degree Days

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		186.4		60.3		31.4		17.2		---		---		---		---		---		---		---		---		43.1

Growing Degree Days

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2510.4		318.6		266.8		275.6		183.3		120.6		16.7		25.8		94.7		183.3		232.5		250		301.4

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.5		14		13.4		12.6		11.8		11.2		10.9		11.1		11.6		12.3		13.1		13.8		14.2

Average Daily Sunshine

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		9.8		9		10		9		9		9		9		9		11		11		10		11		11

Average Number of Days With Fog

Years on Record: 15

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

Average Wind Speed

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
km/h		14		14		14		12		12		14		14		12		16		17		17		16		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		20.3		24.4		22.8		20.7		18.1		16.5		14.9		16.2		18.5		21.8		22.4		23.3		24.4

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.6		8.6		7.7		6.3		4.6		2.8		2.3		2.2		3.3		4.6		7.1		8.4		8.9

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		21.9		22.1		21.6		21.5		21.3		21.3		20.8		22		23.2		23.9		21.9		21.4		21.7

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		24.6		22.9		22.1		22.2		23.3		26.8		26.8		28.7		27.5		27.4		22.8		21.5		22.5

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		20.3		24.4		22.8		20.7		18.1		16.5		14.9		16.2		18.5		21.8		22.4		23.3		24.4

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		6.5		9.2		8.6		7.3		5.6		3.7		3.4		3		4.3		6.2		7.8		9.2		9.5

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		24.8		24.7		25.2		25.1		25.6		24		23.1		23.9		25.2		26.7		24.4		25.1		24.2

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		30.3		28.9		29.4		29.1		31.1		31.9		31.2		32.2		31		32.8		28		29.8		28.4

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		17.3		21.7		18.2		16.2		15.2		14.8		12.8		14.8		16.3		17.6		19.6		19		21.4

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		4.5		7.6		6.5		5.1		3.2		1.9		1.6		1.6		2.6		3.5		6.1		7		7.9

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		18.4		19.7		17.2		16.5		17.3		18.6		17		19.7		19.9		18.9		19		17.6		19.3

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		18.1		18		14		13.7		16.5		21.8		19.9		24.2		21.7		18.2		17.5		14.2		17.2