ROTTERDAM, NETHERLANDS

Average Temperature

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		50		38		38		43		47		54		59		63		63		58		52		44		41

Average High Temperature

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		56		42		42		48		53		61		66		69		70		64		57		49		44

Average Low Temperature

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		44		34		33		37		39		46		52		56		55		51		46		40		36

Highest Recorded Temperature

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		93		57		61		69		79		85		88		90		93		84		77		68		59

Lowest Recorded Temperature

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		4		4		9		17		23		32		36		42		41		34		28		20		9

Average Number of Days Above 70F/21C

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		48		---		---		---		1		5		9		13		15		5		1		---		---

Average Number of Days Above 60F/15C

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		142		---		---		1		5		16		24		30		30		25		9		1		---

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		51		11		13		7		4		---		---		---		---		---		1		5		9

Average Precipitation

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in.		31.6		2.8		1.7		2.6		1.7		2.1		2.7		2.8		2.7		3		3.3		3.3		3

Average Number of Days With Precipitation

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		241		24		17		22		18		18		18		19		18		20		21		22		24

Average Number of Days With Sleet

Years on Record: 21

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

Average Number of Rainy Days

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		235		22		15		21		18		18		18		19		18		20		21		22		23

Average Number of Days With Thunderstorms

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		27		1		1		1		1		3		4		4		4		3		2		2		1

Average No. of Days With Freezing Rain

Years on Record: 21

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

Average Number of Days With Snow

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		22		6		5		3		2		---		---		---		---		---		---		2		4

Average Morning Relative Humidity

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		91		91		90		91		91		88		89		89		92		94		93		91		91

Average Evening Relative Humidity

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		74		86		78		74		68		65		68		68		66		72		77		84		87

Average Dew Point

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		45		35		33		38		40		47		52		56		56		53		47		41		38

Heating Degree Days

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		5606.4		837		776.9		697.5		570		356.5		180		77.5		77.5		225		418.5		615		775

Growing Degree Days

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1425		---		---		---		---		108.5		270		387.5		387.5		225		46.5		---		---

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		14.6		16.4		17.4		16.9		15.2		13.2		11.2		9.4		8.5

Average Number of Days With Fog

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		244		20		19		20		19		21		21		20		22		21		21		19		21

Average Number of Days With Smoke/Haze

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		186		12		16		19		17		17		17		15		17		16		15		12		13

Average No. of Days With Vision Obstruction

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		275		23		23		24		22		23		23		23		24		23		23		21		23

Average Wind Speed

Years on Record: 21

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mph		11		12		11		11		10		10		10		10		10		9		10		11		12

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		3		0.8		1.5		2.6		4.1		5.5		5.6		5.4		4.7		3		1.7		0.9		0.5

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.6		0.5		0.9		1.5		2.1		2.5		2.8		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		3.2		1.3		2.2		3.2		4.3		5.1		4.8		4.8		4.7		3.5		2.3		1.4		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		3		1.2		1.9		2.7		4		5.3		4.8		4.9		4.6		3.1		2		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		3		0.8		1.5		2.6		4.1		5.5		5.6		5.4		4.7		3		1.7		0.9		0.5

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		0.6		1		1.6		2.1		2.7		2.8		2.7		2.3		1.7		1.1		0.7		0.4

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4		1.8		3		4		5.1		6.3		5.4		5.7		5.8		4.4		2.8		2		1.3

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.1		1.7		2.7		3.7		5.2		7.3		6.2		6.6		6.4		4.2		2.6		1.8		1.1

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.5		0.6		1.3		2.3		3.4		4.2		4.8		4.6		4.2		2.5		1.1		0.6		0.4

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.5		0.4		0.8		1.4		2.1		2.5		2.7		2.6		2.2		1.5		0.7		0.5		0.3

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		2.6		0.9		1.8		2.7		3.5		3.8		4.1		4.1		4.1		2.8		1.3		0.9		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		2.1		0.7		1.5		2.1		2.6		3		3.5		3.4		3.6		2.2		0.9		0.7		0.5