BISON, SOUTH DAKOTA

Average Temperature

Years on Record: 95

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		6.9		-8.4		-6.1		-0.6		6.6		12.9		18		22.4		21.6		15.5		8.2		-0.2		-6.3

Average High Temperature

Years on Record: 95

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		13.8		-2.6		-0.2		5.4		13.5		20.1		25.2		30.4		29.8		23.6		15.5		5.6		-0.5

Average Low Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		1		-12.1		-10.3		-5.6		0.1		6.3		11.3		14.8		13.9		8.1		1.6		-5.6		-11.4

Highest Recorded Temperature

Years on Record: 95

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		43.9		21.7		21.7		26.7		33.3		38.9		43.3		43.9		41.7		41.7		35		31.1		20.6

Lowest Recorded Temperature

Years on Record: 95

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-41.1		-38.9		-41.1		-33.3		-21.1		-11.7		-2.2		2.8		0.6		-7.8		-22.2		-27.2		-36.7

Average Number of Days Above 100F/38C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2.8		---		---		---		---		---		0.2		1.6		1		---		---		---		---

Average Number of Days Above 90F/32C

Years on Record: 95

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		29.4		---		---		---		0.1		0.7		3.1		12		10.8		2.6		0.1		---		---

Average Number of Days Above 80F/26C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		79.7		---		---		---		1.3		4.7		12		24.1		24.7		11.1		1.9		---		---

Average Number of Days Above 70F/21C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		135.2		---		0.1		1.1		5.9		14.6		25		29.9		30.1		20.7		7.3		0.6		---

Average Number of Days Above 60F/15C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		181.5		0.2		0.9		4.1		13.6		24.8		29.2		30.8		30.9		26.8		15.9		3.9		0.2

Average Number of Days Above 50F/10C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		228.1		2		4.2		11.9		22.7		29.9		29.9		31		31		29.3		24.5		9.5		2.3

Average Number of Days Above 40F/4C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		274.8		9.1		10.5		18.9		27.4		30.8		30		31		31		29.8		29.1		18		9.1

Average Number of Days Below 70F/21C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		363.5		31		28		31		30		31		29.8		30.1		30.6		30		31		30		31

Average Number of Days Below 60F/15C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		335.8		31		28		31		30		30.7		25.8		18.3		20.6		28.5		31		30		31

Average Number of Days Below 50F/10C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		271.7		31		28		31		29.6		24.8		10.9		2.2		4		19.6		29.7		30		31

Average Number of Days Below 40F/4C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		212.4		31		27.9		30.3		24		10.1		1.1		---		0.1		5.8		22		29		31

Average Number of Days Below 32F/0C

Years on Record: 95

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		174.7		30.1		26.9		27		16.6		3.7		0.1		---		---		2		12.9		25.5		29.9

Average Number of Days Below 20F/-6C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		87.9		21.9		17.3		11		2.7		---		---		---		---		---		1.6		11.6		21.8

Average Number of Days Below 10F/-12C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		45.4		13.7		10.2		4.4		0.2		---		---		---		---		---		0.2		4.4		12.3

Average Number of Days Below 0F/-17C

Years on Record: 95

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		29.8		10.9		7.4		2.6		0.1		---		---		---		---		---		---		1.6		7.2

Average Precipitation

Years on Record: 95

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		417		11		12		25		45		67		80		53		41		31		29		13		10

Average Number of Days With Precipitation

Years on Record: 95

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		65		4		4		5		7		8		9		7		6		5		4		3		3

Most Reported Precipitation in a Month

Years on Record: 95

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		251		58		60		101		156		220		251		236		125		106		139		67		48

Least Reported Precipitation in a Month

Years on Record: 95

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		---		---		---		---		---		2		5		---		---		---		---		---		---

Most Precipitation Reported in a Day

Years on Record: 95

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		84.3		50.8		20.3		61		82.3		81.3		73.7		64.8		84.3		49.3		53.3		36.3		21.8

Avg. No. of Days w/Precip. Above 0.1in/2.5mm

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		42		1.7		2		3.1		4.5		5.9		6.4		4.9		3.7		3.2		3.1		1.8		1.7

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

Years on Record: 95

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		40		2		2		3		4		6		6		5		4		3		2		2		1

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

Years on Record: 95

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		9		---		---		---		1		2		2		1		1		1		1		---		---

Avg. No. of Days w/Precip. Above 0.5in/13mm

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		11.1		0.2		0.1		0.7		1.1		2.4		1.8		1.4		1.2		0.7		1		0.4		0.1

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

Years on Record: 95

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

Average Snowfall

Years on Record: 95

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		80.5		13.2		15		17.8		8.1		1.3		0.2		---		---		0.2		3.8		10.7		10.2

Average Number of Days With Snow

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		13.3		1.9		2.7		2.8		1.1		0.1		---		---		---		---		0.5		1.9		2.3

Most Snow Reported in a Month

Years on Record: 95

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		66		65.3		56.1		61		40.6		24.4		20.3		---		---		20.3		33.5		45.7		66

Avg. No. of Days w/Snow Above 1in/2.5cm

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		12.4		1.8		2.4		2.7		1.1		0.1		---		---		---		---		0.4		1.7		2.2

Avg. No. of Days w/Snow Above 3in/7.5cm

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		4.7		0.6		0.7		1.2		0.8		---		---		---		---		---		0.2		0.6		0.6

Avg. No. of Days w/Snow Above 5in/12.7cm

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1.9		0.2		0.3		0.5		0.4		---		---		---		---		---		0.1		0.2		0.2

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		7598		1384		1155		989		594		295		86		14		21		183		545		978		1354

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		654		---		---		---		2		18		92		249		228		61		4		---		---

Growing Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2577		---		---		8		62		227		458		700		673		348		93		8		---

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.8		9.8		11		12.5		14.1		15.5		16.3		15.8		14.6		13		11.4		10		9.3

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.8		5.5		8.6		12.6		17.2		20.6		22.4		23.3		19.8		14.9		10.1		6.2		4.7

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		6.1		3.1		4.4		6.2		7		8.8		9.3		9		8		6.6		4.9		3.5		2.8

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15.3		9.6		12.9		15.7		18.1		18.9		19.5		20.7		19.7		17.1		13.7		10.1		8.2

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15.1		8.2		11.4		13.6		18.5		19.4		21.2		23.2		20.3		16.2		13		8.9		7.4

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.8		5.5		8.6		12.6		17.2		20.6		22.4		23.3		19.8		14.9		10.1		6.2		4.7

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		6.5		3.4		4.7		6.5		7.6		9		9.8		9.3		8.6		7.2		5.2		3.9		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		17.8		10.7		14.7		17.9		22.6		21.9		23.3		22.8		22.9		20.3		15.4		12.2		9.2

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		18.5		9.3		13.2		16.2		24.4		24.6		27.6		26.5		24.7		20.2		15		11.3		8.5

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		4.7		7.3		9.1		14.3		15.9		18.7		17		15.8		10.9		8.1		5.2		4.1

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.8		2.8		3.9		5.5		6.6		8.7		9.2		8.9		7.9		6		4.2		3		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		11.9		7.9		10.8		11		14.8		14.5		16.3		15.1		15.3		11.9		10.6		8.3		7

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.2		6.5		9.2		7.7		13.9		11.4		14.8		12.6		13.1		9.7		9.7		6.9		6.1