ROTTNEST ISLAND, WESTERN AUSTRALIA

Average Temperature

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		64		71		72		70		67		62		59		57		57		59		61		65		68

Average High Temperature

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		70		78		79		77		73		68		64		62		63		65		67		72		75

Average Low Temperature

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		58		64		65		64		61		57		54		52		52		53		55		59		62

Highest Recorded Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		106		106		106		100		93		81		75		73		73		78		91		101		101

Lowest Recorded Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		37		53		49		46		47		37		43		40		40		41		43		43		47

Average Morning Temperature

Years on Record: 87

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		64		71		71		69		66		62		59		57		57		59		62		66		69

Average Afternoon Temperature

Years on Record: 71

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		68		74		75		74		71		66		62		60		61		62		65		69		71

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
in		28		---		---		---		1		4		6		5		4		2		1		---		---

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
in		6		3		6		2		3		4		3		3		3		1		2		1		1

Most Rain Reported in a Month

Years on Record: 114

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		14		5		6		3		4		11		14		13		11		6		6		2		3

Least Rain Reported in a Month

Years on Record: 114

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		---		---		---		---		---		1		1		1		---		---		---		---		---

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
F		52		56		57		56		55		52		50		49		48		49		50		52		54

Average Afternoon Dew Point

Years on Record: 15

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		53		59		60		59		55		52		50		48		48		50		51		54		56

Average Morning Web Bulb

Years on Record: 83

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		58		63		64		63		60		57		55		53		53		55		56		59		61

Average Afternoon Wet Bulb

Years on Record: 71

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		61		66		67		66		63		59		57		55		55		56		58		62		64

Heating Degree Days

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1042		---		---		---		---		77.5		180		248		232.5		180		124		---		---

Cooling Degree Days

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		737.8		186		197.8		170.5		60		---		---		---		---		---		---		15		108.5

Growing Degree Days

Years on Record: 97

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		5174.5		651		621.5		635.5		510		387.5		270		217		232.5		270		341		465		573.5

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
kWh/m2		5.6		8.5		7.5		6		4.4		3.2		2.7		2.9		3.8		5.1		6.6		7.8		8.5

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.4		1.8		1.6		1.4		1.2		1		0.9		0.9		1.1		1.4		1.7		1.9		1.9

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5.9		7.5		7.3		6.5		5.5		4.3		3.9		4.1		4.8		5.8		6.5		7		7.3

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		7		9.9		9		7.5		5.9		4.8		4.3		4.5		5.2		6.3		7.5		8.7		9.7

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5.6		8.5		7.5		6		4.4		3.2		2.7		2.9		3.8		5.1		6.6		7.8		8.5

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.6		2.1		2		1.7		1.4		1.1		0.9		1		1.3		1.6		2		2.2		2.1

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		6.5		7.8		8		7.3		6.2		5		4.8		4.7		5.1		6.5		7.1		7.7		7.8

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		8.2		10.9		10.6		9		7.2		5.9		5.8		5.4		5.8		7.6		8.6		10.5		11

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5		7.6		6.6		5.4		3.9		2.7		2.3		2.6		3.3		4.7		5.8		7		8

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.2		1.5		1.3		1.1		1		0.9		0.7		0.8		1.1		1.2		1.5		1.5		1.6

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5.2		6.8		6.4		5.8		4.8		3.5		3.3		3.6		4.1		5.2		5.7		6.4		6.9

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5.6		8.1		7		6.2		4.9		3.4		3.4		3.7		4.1		5.3		5.8		7.1		8.6