NORWALK, IOWA

Average Temperature

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		10		-6.4		-3.4		2.8		10.4		16.7		21.9		24.4		23.3		18.4		11.9		3.7		-3.5

Average High Temperature

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		15.4		-1.7		1.4		8.1		16.3		22.4		27.6		30		28.8		24.4		17.9		8.7		1.1

Average Low Temperature

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		4.6		-11.2		-8.4		-2.5		4.5		10.9		16.3		18.9		17.7		12.4		6		-1.3		-8.1

Highest Recorded Temperature

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		42.2		19.4		22.8		32.8		33.9		36.7		39.4		40.6		42.2		37.2		35		26.1		20.6

Lowest Recorded Temperature

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-32.2		-31.1		-32.2		-30		-12.8		-1.1		5		8.3		4.4		-2.2		-10		-20		-30

Average Number of Days Above 90F/32C

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		22.8		---		---		---		0.1		0.5		4.2		9.1		6.8		2		0.1		---		---

Average Number of Days Below 32F/0C

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		135.5		29.9		25.6		21.1		6.8		0.3		---		---		---		0.2		4.4		18.5		28.7

Average Number of Days Below 0F/-17C

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		14.3		7.1		3.4		0.3		---		---		---		---		---		---		---		0.2		3.3

Average Precipitation

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		838		26		30		56		89		109		115		98		102		76		60		47		31

Average Number of Days With Precipitation

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		108		8		7		10		11		11		11		10		9		8		8		7		8

Most Reported Precipitation in a Month

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		348		111		76		148		197		308		342		267		348		259		167		166		87

Least Reported Precipitation in a Month

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		---		1		3		4		6		31		26		1		6		10		1		1		---

Most Precipitation Reported in a Day

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		157		54.1		41.7		53.6		96.5		82		107.4		80.8		157		112.3		58.4		90.2		37.6

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

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		61		3		3		5		7		8		7		6		6		5		4		4		3

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

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		22		---		1		1		2		3		3		3		3		2		2		1		1

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

Years on Record: 63

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

Average Number of Rainy Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		109		7.7		7.4		10		10.7		11.4		10.8		9.4		9.2		8.6		7.4		7.3		7.9

Most Rain Reported in a Day

Years on Record: 60

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		150		50		40		50		90		80		130		90		150		110		50		60		30

Most Rain Reported in a Month

Years on Record: 60

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1410		110		70		140		190		300		360		260		340		250		180		160		80

Least Rain Reported in a Month

Years on Record: 60

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		430		---		---		---		---		30		20		---		---		10		---		---		---

Average Snowfall

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		89.2		21.8		20.8		14.5		4.8		---		---		---		---		---		0.8		7.9		18.5

Most Snow Reported in a Month

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		71.6		56.6		57.7		44.7		39.6		---		---		---		---		---		18.8		37.3		71.6

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		3575.6		769.4		605.6		458.9		243.9		85		8.9		0.6		3.3		57.2		214.4		446.7		681.7

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		584.4		---		---		0.6		6.7		33.3		121.7		196.1		158.3		61.1		6.7		---		---

Growing Degree Days

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1748.1		---		---		---		11.7		206.7		358.3		447.8		411.6		251.7		60.3		---		---

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.7		10.1		11.1		12.5		13.9		15.1		15.7		15.4		14.3		12.9		11.5		10.3		9.7

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.9		6.5		9.2		12.8		16.4		19.3		22		22		19		15.5		11		7		5.6

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.4		2.6		3.6		5.2		6.9		8.1		8.6		8.1		7.1		5.5		4		2.8		2.3

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15.7		11.9		13.6		15.6		16.9		17.8		19.1		19.6		18.6		17.8		15.5		11.4		10.7

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		16.1		12.1		13.6		15.1		16.2		17.8		20.8		21.7		19.6		18.4		15.8		11.7		10.8

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.9		6.5		9.2		12.8		16.4		19.3		22		22		19		15.5		11		7		5.6

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.7		2.6		3.8		5.4		7.2		8.5		9		8.8		7.6		6		4.2		2.9		2.3

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		19		13.7		16.8		20.4		20.2		21.7		21.9		21.6		21.2		21.3		19.6		15.8		13.9

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		21.7		14.3		17.9		22.7		22.1		26		27.4		26.3		24.5		24.5		21.9		17.7		15.1

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.9		5.3		7.3		9.4		13.2		13.6		18.7		17.5		15.8		12.3		7.8		5.1		4.8

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		4.9		2.5		3.3		4.4		6.4		7.3		7.7		7.5		6.5		4.8		3.4		2.5		2

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		11.8		8.8		10.1		10.6		13.2		12.4		16.4		15.7		15.4		13.5		9.7		7.3		8.5

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		8.1		8.6		8.1		10.4		8.5		15.1		13.8		13.5		11.7		8		6.3		8