ROTTNEST ISLAND, WESTERN AUSTRALIA

Average Temperature

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		18		22		22		21		19		17		15		14		14		15		16		18		20

Average High Temperature

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		21.5		26		26.5		25.2		23.1		20.2		18.1		17.2		17.3		18.4		19.9		22.3		24.3

Average Low Temperature

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		14.9		18.3		18.7		17.9		16.2		14.3		12.6		11.6		11.5		12.2		13.1		15.1		16.9

Highest Recorded Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		41.4		41.2		41.4		38		34.4		27.7		24		23.2		23.3		25.6		33.1		38.5		38.8

Lowest Recorded Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		2.8		12.1		9.7		7.9		8.5		2.8		6.2		4.8		4.5		5.3		6.6		6.5		8.5

Average Morning Temperature

Years on Record: 87

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		18.1		22.1		22.2		21		19.2		17		15.3		14.4		14.4		15.4		16.9		19		20.8

Average Afternoon Temperature

Years on Record: 71

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		20		23.8		24.2		23.4		21.8		19.1		17		16		16.2		17.1		18.4		20.6		22.2

Average Number of Days Above 104F/40C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		0.3		0.1		0.1		---		---		---		---		---		---		---		---		---		---

Average Number of Days Above 95F/35C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		5.4		2		1.4		0.7		---		---		---		---		---		---		---		0.1		1.1

Average Number of Days Above 86F/30C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		21.5		5.7		6.2		4.2		0.7		---		---		---		---		---		0.3		1.2		3.2

Average Precipitation

Years on Record: 114

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		710		---		10		10		30		100		150		140		100		60		30		10		---

Average Number of Rainy Days

Years on Record: 90

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		120.7		2.2		2.3		3.7		7.7		14.5		18.3		19.9		17.6		14		10.7		6.3		3.4

Most Rain Reported in a Day

Years on Record: 89

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		150		70		150		70		80		110		70		70		80		40		50		20		40

Most Rain Reported in a Month

Years on Record: 114

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		370		130		170		70		120		280		370		340		280		170		160		60		80

Least Rain Reported in a Month

Years on Record: 114

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

Average Morning Relative Humidity

Years on Record: 44

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		69		63		64		67		70		72		75		75		73		71		68		64		63

Average Evening Relative Humidity

Years on Record: 32

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		64		62		62		64		63		64		68		67		66		65		64		64		63

Average Morning Dew Point

Years on Record: 25

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		11.5		13.5		14.3		13.5		12.8		11.4		10.4		9.7		9.1		9.7		10.3		11.3		12.6

Average Afternoon Dew Point

Years on Record: 15

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		12.1		15		15.9		15		13.1		11.2		10.1		9.3		9.3		10		10.7		12.6		13.8

Average Morning Web Bulb

Years on Record: 83

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		14.9		17.6		17.9		17.3		16		14.3		13		12.1		12		12.8		13.7		15.3		16.6

Average Afternoon Wet Bulb

Years on Record: 71

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		16.2		19.3		19.7		19		17.6		15.4		13.9		12.9		13		13.8		14.9		16.7		18

Heating Degree Days

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		579		---		---		---		---		43.1		100		137.8		129.2		100		68.9		---		---

Cooling Degree Days

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		458		103.3		109.9		94.7		33.3		---		---		---		---		---		---		8.3		60.3

Growing Degree Days

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		3129.7		361.7		345.3		353.1		283.3		215.3		150		120.6		129.2		150		189.4		258.3		318.6

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.5		14.4		13.6		12.7		11.7		10.9		10.5		10.7		11.4		12.3		13.3		14.2		14.7

Average Number of Clear Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		120.8		16.6		14		13.6		9		7		5.8		5.4		7.3		8.1		9		9.9		15

Average Number of Cloudy Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		113.7		5.2		5.9		6.8		10.1		12.5		13.7		13.4		11.8		10.4		9.4		9.1		5.5

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		30.4		27.1		21.7		15.8		11.4		9.6		10.3		13.5		18.4		23.6		27.9		30.6

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		6.3		5.7		5.1		4.4		3.6		3.1		3.4		4.1		5.1		6.1		6.8		6.7

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		21.2		26.9		26.2		23.5		19.8		15.6		14.1		14.8		17.1		20.9		23.5		25.3		26.4

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		25		35.6		32.4		27		21.3		17.2		15.6		16.3		18.8		22.6		27.1		31.4		35

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		30.4		27.1		21.7		15.8		11.4		9.6		10.3		13.5		18.4		23.6		27.9		30.6

Maximum 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		7.6		7.2		5.9		4.9		4		3.4		3.6		4.6		5.7		7.1		7.9		7.6

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		23.4		28.1		28.6		26.3		22.4		18		17.4		16.7		18.2		23.5		25.4		27.7		28

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		29.4		39.1		38		32.3		25.8		21.1		20.8		19.4		20.7		27.2		31.1		37.7		39.5

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		27.4		23.8		19.6		14.2		9.6		8.4		9.3		11.9		16.8		20.7		25.2		28.7

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		4.2		5.5		4.5		4.1		3.7		3.1		2.6		3		3.8		4.4		5.3		5.3		5.8

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		18.7		24.4		22.9		21		17.4		12.5		11.9		12.8		14.8		18.9		20.4		22.9		24.9

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		20.2		29.2		25.1		22.2		17.5		12.4		12.2		13.3		14.6		19.1		20.9		25.6		30.9