KEYSTONE, OKLAHOMA

Average Temperature

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		15.6		3		5.8		8.9		15.5		20.6		25.1		27.6		27.2		22.7		17.4		9.3		4.3

Average High Temperature

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		22.6		9.8		12.7		15.9		22.6		26.8		31.3		34.2		34.5		30.3		25.3		16.7		11

Average Low Temperature

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		8.7		-3.8		-1.1		2		8.6		14.4		18.9		20.9		19.8		15.2		9.6		2		-2.4

Highest Recorded Temperature

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		46.1		27.8		31.7		32.8		36.7		35.6		40.6		46.1		44.4		41.1		36.1		29.4		28.3

Lowest Recorded Temperature

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-26.1		-26.1		-22.2		-16.1		-7.2		-1.1		6.1		10.6		9.4		1.1		-7.2		-13.3		-19.4

Average Number of Days Above 90F/32C

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		80.2		---		---		0.1		1.2		3.1		14.8		22.7		22.8		12.3		3.2		---		---

Average Number of Days Below 32F/0C

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		90.9		23.6		16.5		12.6		2.6		0.1		---		---		---		---		2		12.1		21.4

Average Number of Days Below 0F/-17C

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		0.7		0.4		0.1		---		---		---		---		---		---		---		---		---		0.2

Average Precipitation

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		905		34		40		58		91		147		109		127		70		85		67		45		32

Average Number of Days With Precipitation

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		77		5		6		7		8		10		8		7		6		5		6		4		5

Most Reported Precipitation in a Month

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		361		157		80		159		210		299		361		312		165		251		163		112		67

Least Reported Precipitation in a Month

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		---		9		18		9		24		59		20		8		22		2		---		---		---

Most Precipitation Reported in a Day

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		116.1		46.7		30.2		51.3		102.6		115.8		116.1		109		73.2		93.7		56.6		68.6		27.7

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

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		53		3		4		4		5		7		6		6		4		4		4		3		3

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

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		23		1		1		2		2		4		2		3		2		2		2		1		1

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

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		11		---		---		1		1		2		1		2		1		1		1		1		---

Average Snowfall

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		24.1		9.4		5.6		4.8		0.2		---		---		---		---		---		---		0.5		3.6

Most Snow Reported in a Month

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		31.5		31		31.5		28.4		2.5		---		---		---		---		---		---		4.3		23.6

Heating Degree Days

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1113.3		308.9		204.4		149.4		34.4		1.7		---		---		---		---		17.8		128.9		267.8

Cooling Degree Days

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1094.4		---		0.6		3.9		31.1		96.7		205		286.7		274.4		142.2		51.1		2.8		---

Growing Degree Days

Years on Record: 17

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2636.1		---		---		---		165		328.9		453.3		544.2		532.2		381.7		230.8		---		---

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.6		10.5		11.4		12.4		13.6		14.6		15.1		14.8		13.9		12.8		11.7		10.7		10.2

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15.7		8.6		11.2		14.9		18.6		20.5		22		23.6		20.9		17.4		13.2		9.3		7.7

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		3.2		4.2		5.7		7.1		8.3		8.6		7.9		7.2		5.9		4.5		3.4		2.9

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		17		13		14.5		17.1		18.7		18.8		19.3		21		20.2		19		17.2		13.5		12.2

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		17.6		13.6		14.8		16.5		18.4		18.6		20.1		23.7		21.5		19.6		17.6		14.2		12.8

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15.7		8.6		11.2		14.9		18.6		20.5		22		23.6		20.9		17.4		13.2		9.3		7.7

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		8.6		9.1		8.6		7.7		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		20.9		18.2		18.7		21.7		23.4		21.8		22		22.9		22.8		23.1		21.7		19		15.9

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		24.4		21.5		21.5		24.1		27.4		24.8		26.2		28.3		26.8		26.9		24.7		22.6		18.3

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		12.8		7.3		8.5		12.6		14.8		16.1		18		20.9		18.7		13.7		10.6		7.2		5.8

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		3.6		4.8		5.8		7.5		7.8		7.1		6.3		4.8		3.6		2.7		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		13.5		10.3		10.1		14		14.7		14.8		16		18.7		18		14.5		12.9		9.5		8.2

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		11.8		9.8		8.5		11.8		11.6		11.3		13.2		18.6		17.1		12.2		11.3		8.5		7.3