DECATUR, TENNESSEE

Average Temperature

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		14.9		4.3		5.4		10.2		14.8		19.4		23.7		25.3		24.9		22.1		15.4		8.9		4.7

Average High Temperature

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		21.9		10.1		11.7		17.2		22.3		27		30.9		32.2		31.8		29.4		23.2		16.1		10.5

Average Low Temperature

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		8		-1.6		-0.9		3.2		7.3		11.9		16.7		18.6		18.1		14.5		7.7		1.9		-1.1

Highest Recorded Temperature

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		42.2		25		25.6		32.8		34.4		37.2		41.1		42.2		41.7		41.1		35.6		27.8		24.4

Lowest Recorded Temperature

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-28.9		-28.3		-28.9		-16.7		-6.7		-1.1		2.2		8.3		6.7		-1.1		-10.6		-13.9		-20

Average Number of Days Above 90F/32C

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		58.2		---		---		---		0.2		3.4		12.3		16.8		16		8.8		0.6		---		---

Average Number of Days Below 32F/0C

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		85.2		19.7		16.3		11		3.2		0.1		---		---		---		---		3.1		13.1		18.7

Average Number of Days Below 0F/-17C

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		0.5		0.3		0.1		---		---		---		---		---		---		---		---		---		0.1

Average Precipitation

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1350		127		130		148		120		106		106		121		115		70		77		90		139

Average Number of Days With Precipitation

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		126		12		11		12		10		10		11		12		11		8		7		9		12

Most Precipitation Reported in a Day

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm.		203.2		152.4		84.3		83.8		106.7		79.5		122.7		89.9		203.2		93.5		85.3		105.7		120.9

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

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		84		8		8		9		8		7		7		8		7		5		4		6		8

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

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		37		4		4		4		3		3		3		3		3		2		2		2		4

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

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		15		1		2		2		1		1		1		1		1		1		1		1		2

Most Rain Reported in a Month

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1795		324		384		309		264		254		253		265		425		198		223		269		346

Least Rain Reported in a Month

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		954		44		19		26		36		14		12		17		23		5		1		11		20

Average Snowfall

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm.		21.8		6.9		5.6		3		---		---		---		---		---		---		---		1.5		4.8

Most Snow Reported in a Month

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm.		61		36.8		47		30.5		1.3		---		---		---		---		---		---		20.3		38.1

Heating Degree Days

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2290.2		435.7		365.7		253.2		105.8		---		---		---		---		---		88.7		280		422.8

Cooling Degree Days

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		731.5		---		---		---		---		35.3		163.3		217.9		205.8		109.2		---		---		---

Growing Degree Days

Years on Record: 61

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2325.7		---		---		5.2		144.2		293.7		413.3		476.2		464.2		359.2		169.7		---		---

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.6		10.6		11.4		12.4		13.6		14.5		15		14.8		13.9		12.8		11.7		10.7		10.3

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.4		7.5		9.8		13.7		17.5		18.9		20.8		20.4		18.6		16.5		12.9		8.8		6.8

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		3.4		4.4		5.9		7.3		8.5		8.9		8.6		7.7		6.1		4.6		3.5		3.1

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15.4		10.9		12.2		15.4		17.6		17.4		18.3		18.3		18		18		16.6		12.4		10.3

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.9		10.6		11.5		14		16.3		15.8		17.9		17.8		17.1		17.8		16.7		12.6		10.2

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.4		7.5		9.8		13.7		17.5		18.9		20.8		20.4		18.6		16.5		12.9		8.8		6.8

Maximum 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		3.4		4.5		6		7.6		8.7		9.1		8.9		7.9		6.5		5		3.7		3.1

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		18.8		13.7		15.3		19.3		19.6		20.6		20.9		21.3		19.9		21.8		21.2		18.1		13.1

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		20.4		14.7		16.1		20		19.7		22.1		23.5		24.3		20.8		24.3		23.9		21.2		14.2

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		11.8		6.2		7		11		14.2		16.1		16.5		18.5		16.7		14.2		9.2		6.1		5.7

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.5		3.2		4.2		5.4		7		7.9		8.2		7.8		7.3		5.3		3.7		2.8		2.9

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		12.2		8.3		7.9		11.9		14		14.8		14.7		16.7		16.1		15.1		10.8		7.7		8

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		9.8		7.1		5.7		9		10.6		11.3		11.1		14.6		13.7		13.1		8.5		6.2		7.1