DERBY, WESTERN AUSTRALIA

Average Temperature

Years on Record: 9

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		28		30		30		30		29		26		23		22		25		27		30		31		32

Average High Temperature

Years on Record: 10

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		34		35		33		35		35		32		30		30		32		35		37		37		37

Average Low Temperature

Years on Record: 10

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		21		25		25		25		22		19		15		15		17		20		22		25		26

Highest Recorded Temperature

Years on Record: 10

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		43		41		41		41		40		37		35		35		37		41		43		43		43

Lowest Recorded Temperature

Years on Record: 10

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		6		20		19		20		16		9		6		7		8		12		16		20		18

Average Number of Days Above 95F/35C

Years on Record: 10

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		180		18		11		19		22		6		---		1		5		16		26		28		28

Average Number of Days Above 86F/30C

Years on Record: 10

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		341		30		27		31		30		28		21		23		29		30		31		30		31

Average Number of Days Below 75F/23C

Years on Record: 10

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		224		8		7		8		20		29		30		31		31		28		21		6		4

Average Number of Days Below 65F/18C

Years on Record: 10

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		97		---		---		---		2		13		24		27		20		10		1		---		---

Average Precipitation

Years on Record: 10

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		720		250		210		120		10		10		10		10		---		---		---		10		50

Average Number of Days With Thunderstorms

Years on Record: 10

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		54		13		13		11		2		---		---		---		---		---		2		3		10

Most Rain Reported in a Month

Years on Record: 10

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1200		700		400		270		60		40		80		70		10		40		20		40		120

Least Recorded Rainfall

Years on Record: 10

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		420		60		100		10		---		---		---		---		---		---		---		---		30

Average Morning Relative Humidity

Years on Record: 9

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		70		84		88		84		72		62		60		59		63		64		69		72		76

Average Evening Relative Humidity

Years on Record: 9

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		38		57		61		51		36		35		31		29		28		28		32		39		44

Average Dew Point

Years on Record: 9

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		15		23		23		22		17		12		8		8		10		12		16		19		21

Cooling Degree Days

Years on Record: 10

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		3901.5		370.3		313.9		370.3		325		232.5		133.3		137.8		206.7		275		361.7		400		430.6

Growing Degree Days

Years on Record: 10

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		6960.5		620		549.3		620		575		490.8		383.3		396.1		465		525		620		600		620

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.5		13.4		13		12.5		12.1		11.7		11.5		11.6		11.9		12.4		12.9		13.3		13.5

Average Number of Days With Fog

Years on Record: 10

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

Average Wind Speed

Years on Record: 8

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
km/h		12		14		12		9		8		9		9		9		9		12		14		16		16

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		21.1		21.7		20.5		21		20.4		18.5		17		17.9		19.9		22.9		24.7		25.6		23.6

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		6.2		8.7		8.4		7.1		5.4		4.1		3.8		3.8		4.6		5.6		6.8		7.5		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		22.1		21.8		19.5		21		22		21.4		20.3		21.3		22.1		23.7		23.8		24.9		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		23.2		18.8		17.2		20.3		23.6		24.8		24.1		25.2		24.9		25.9		25.6		26		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		21.1		21.7		20.5		21		20.4		18.5		17		17.9		19.9		22.9		24.7		25.6		23.6

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		7		9.2		8.9		8		6.1		5.3		4.4		4.6		5.5		6.4		7.6		8.3		9.1

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		24.6		25.4		24.3		24		23.9		23.3		22.5		22.6		23.5		24.8		25.4		26.9		28.2

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		27.7		24.9		26.3		25.9		27.2		28.3		28.1		27.8		27.5		28		29.1		29.8		29.8

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		18.1		15.8		16.4		16.3		18.4		15.5		15.4		16.1		17.8		20.8		22.2		23.1		19.3

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.4		7.8		7.2		6.2		4.7		3.5		3.1		3.3		4.1		5.2		6.1		6.7		6.9

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		18.8		15.7		15.7		16.3		19.6		17.5		18.2		18.8		19.5		21.4		21.5		22.5		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		17.4		9.7		10.8		12.2		19.2		17.7		20.1		20.6		20		21.6		20.9		21.2		14.6