CARDIFF, WALES

Average Temperature

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		52.7		43.7		43.7		46.4		49.1		55.4		60.8		64.4		64.4		59.9		53.6		48.2		43.7

Average High Temperature

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		59		48.2		48.2		51.8		55.4		62.6		68		71.6		71.6		66.2		59		53.6		48.2

Average Low Temperature

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		46.4		39.2		39.2		41		42.8		48.2		53.6		57.2		57.2		53.6		48.2		42.8		39.2

Highest Recorded Temperature

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		95		59		64.4		68		80.6		82.4		89.6		91.4		95		84.2		71.6		64.4		59

Lowest Recorded Temperature

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		21.2		24.8		21.2		26.6		30.2		37.4		39.2		46.4		44.6		39.2		33.8		24.8		21.2

Average Number of Days Above 70F/21C

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		33		---		---		---		---		2		6		11		11		3		---		---		---

Average Number of Days Above 60F/15C

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		33		---		---		---		3		12		22		30		30		23		7		---		---

Average Number of Days Below 32F/0C

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		33		8		9		5		2		---		---		---		---		---		---		3		5

Average Precipitation

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		36.4		3.6		2.5		2.9		2.1		2.5		2.5		2.7		3		3.3		3.6		3.9		3.7

Average Number of Days With Precipitation

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		182		19		15		16		16		13		14		13		13		13		16		17		17

Average Number of Days With Thunderstorms

Years on Record: 19

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

Most Rain Reported in a Month

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		43.1		6.3		5.4		6.3		4.8		6.1		5.9		6.6		6.8		7.5		7.1		8.5		8.2

Least Recorded Rainfall

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		27.2		0.6		---		0.5		0.4		0.4		0.2		0.5		0.9		0.9		0.4		1.5		1.2

Average Number of Days With Snow

Years on Record: 21

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

Average Relative Humidity

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		78		81		78		75		71		68		69		71		71		74		78		81		81

Average Morning Relative Humidity

Years on Record: 20

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

Average Evening Relative Humidity

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		73		83		78		74		66		66		68		67		67		71		77		81		84

Average Dew Point

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		44		37		35		38		39		45		50		54		54		51		47		42		39

Heating Degree Days

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		4447.1		660.3		601.7		576.6		477		297.6		126		18.6		18.6		153		353.4		504		660.3

Growing Degree Days

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1792.8		---		---		---		---		167.4		324		446.4		446.4		297		111.6		---		---

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.9		9.1		10.6		12.5		14.5		16.3		17.3		16.8		15.1		13.2		11.2		9.5		8.6

Average Number of Days With Fog

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		18		3		2		2		1		1		1		1		1		1		1		2		2

Average Wind Speed

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mph		9.3		10.6		10.6		10		10		9.3		8.7		8.1		8.1		8.7		10		8.7		10.6

Highest Reported Wind Gust

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mph		62.2		62.2		50.4		41.7		49.8		37.9		34.8		31.1		32.3		35.5		42.9		37.9		43.5

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.6		0.7		1.4		2.2		3.5		4.6		4.7		4.7		4		2.8		1.6		0.9		0.6

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.5		0.5		0.8		1.4		2.1		2.5		2.7		2.6		2.2		1.6		1		0.6		0.4

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.8		1.2		1.9		2.6		3.6		4.2		4.1		4.2		3.9		3.1		2.2		1.5		1

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.3		1		1.6		1.9		2.8		3.6		3.5		3.6		3.2		2.6		1.8		1.2		0.8

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.6		0.7		1.4		2.2		3.5		4.6		4.7		4.7		4		2.8		1.6		0.9		0.6

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		0.6		1		1.6		2.1		2.6		2.8		2.6		2.3		1.7		1.1		0.7		0.5

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.6		1.6		2.7		3.8		4.9		5		4.7		5.1		5.2		3.8		2.6		1.9		1.4

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3.5		1.4		2.4		3.3		4.9		5.1		4.7		5.4		5.4		3.5		2.4		1.7		1.2

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.2		0.6		1.1		1.8		3.1		3.8		3.8		3.9		3.2		2.2		1.2		0.8		0.5

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.4		0.4		0.7		1.3		2		2.4		2.6		2.5		2.1		1.4		0.8		0.6		0.4

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.2		0.8		1.4		2		3.1		3.5		3.4		3.5		3		2.3		1.5		1.1		0.7

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.5		0.6		1.1		1.2		2.1		2.4		2.2		2.4		1.9		1.6		1.1		0.9		0.5