DOVER, DELAWARE

Average Temperature

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		13.4		1.8		2.4		6.9		12.3		17.7		22.6		25		24.2		20.8		14.6		8.9		3.4

Average High Temperature

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		18.9		6.6		7.5		12.5		18.3		23.8		28.4		30.6		29.6		26.4		20.4		14.3		8.2

Average Low Temperature

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		7.9		-3		-2.7		1.3		6.2		11.6		16.7		19.4		18.7		15.2		8.8		3.6		-1.3

Highest Recorded Temperature

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		40		25		26.7		31.1		36.1		36.7		38.3		40		38.9		37.2		35		29.4		23.9

Lowest Recorded Temperature

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-23.9		-21.7		-23.9		-13.9		-10		-2.2		5		7.2		1.7		-1.1		-3.9		-11.7		-19.4

Average Number of Days Above 90F/32C

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		28.3		---		---		---		0.2		1.3		6.2		10.5		7.3		2.7		0.1		---		---

Average Number of Days Below 32F/0C

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		89.7		22.8		20.6		13.8		2.6		---		---		---		---		---		1.2		8.6		20

Average Number of Days Below 0F/-17C

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		0.3		0.2		0.1		---		---		---		---		---		---		---		---		---		---

Average Precipitation

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1135		88		77		100		92		98		97		109		125		98		82		83		87

Average Number of Days With Precipitation

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		111		10		9		10		10		11		9		9		9		8		8		8		9

Most Precipitation Reported in a Day

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm.		215.9		68.1		85.8		84.6		98.3		137.2		100.6		215.9		186.4		160.8		132.3		85.1		74.7

Avg. No. of Days w/Precip. Above 0.2in/5mm

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		75		7		6		7		7		7		6		6		6		5		5		6		6

Avg. # of Days w/Precip. Above 0.4in/10mm

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		30		2		2		3		3		3		3		3		3		2		2		2		2

Avg. No. of Days w/Precip. Above 1in/25mm

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		12		1		1		1		1		1		1		1		2		1		1		1		1

Average Number of Rainy Days

Years on Record: 72

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		77		6		6		6		6		6		6		7		7		5		5		5		6

Most Rain Reported in a Month

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1599		206		178		235		206		329		251		362		408		301		229		200		221

Least Rain Reported in a Month

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		543		9		16		6		12		15		17		22		7		---		---		14		10

Average Snowfall

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm.		45.7		12.4		15.8		5.8		0.8		---		---		1.8		---		---		0.2		1		7.6

Most Snow Reported in a Month

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm.		108.2		52.1		96.5		78.7		38.1		---		---		120.7		---		---		7.6		25.4		63.5

Average Relative Humidity

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		73		73		72		70		69		71		73		74		78		76		76		75		73

Average Dew Point

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		7		-3		-2		---		6		11		16		18		18		15		9		3		-2

Heating Degree Days

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2744.6		513.2		449.7		353.9		182.5		18.9		---		---		---		---		115.4		281.7		460.7

Cooling Degree Days

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		587.5		---		---		---		---		---		127.5		206.7		180		73.3		---		---		---

Growing Degree Days

Years on Record: 117

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2053.9		---		---		---		67.5		239.4		377.5		465		438.3		323.3		142.9		---		---

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.7		10.3		11.2		12.4		13.7		14.9		15.4		15.1		14.1		12.9		11.6		10.5		10

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.1		7.3		10.3		13.6		17		19.1		21		19.9		18.3		15.8		12.1		8.2		6.5

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.7		3		3.9		5.5		7.2		8.3		8.8		8.6		7.5		5.9		4.3		3.2		2.6

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15.6		11.7		13.9		15.9		17.2		17.5		18.4		17.8		17.8		17.5		16.2		12.6		11

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15.5		12		14.4		15.2		16.2		16.7		18.5		17.3		17.2		17.5		16.4		13.1		11.4

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.1		7.3		10.3		13.6		17		19.1		21		19.9		18.3		15.8		12.1		8.2		6.5

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.9		3		4.1		5.7		7.4		8.6		9.1		8.8		7.7		6.2		4.6		3.3		2.7

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		18.2		13.7		17.3		18.7		19.7		20.4		20.2		19.6		20.3		20.1		20.2		15.6		13.4

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		19.9		14.9		19.5		19.5		20.5		22.4		22.5		21.1		22		21.7		22.6		17.4		14.7

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		11.7		6.3		8.1		12.1		14.4		12.2		18		17.8		16.2		13.2		10		6.7		4.9

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.3		2.8		3.5		5.2		6.8		7.8		8.4		8.2		7		5.4		3.6		2.8		2.5

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		12.5		9.5		10.2		13.8		14.3		11.2		15.8		16		15.6		14.3		12.6		9.5		7.3

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.7		9		9		12		11.5		6.5		13.5		13.8		13.4		12.4		11.3		8.8		6.5