BIG BEND NATIONAL PARK, TEXAS

Average Temperature

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		66.2		48.9		52.8		59.9		68.1		75.6		80.6		80.8		79.6		74.6		66.7		57		50.1

Average High Temperature

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		79.4		61.7		66.4		74.3		83		89.9		94.1		92.9		91.5		86.8		79.7		69.9		62.7

Average Low Temperature

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		53		36		39.2		45.4		53.3		61.3		67		68.7		67.6		62.3		53.7		44.1		37.4

Highest Recorded Temperature

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		109		83		91		95		99		105		109		108		105		103		99		89		82

Lowest Recorded Temperature

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
F		4		4		8		19		28		39		48		51		55		40		24		14		4

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		7.8		---		---		---		---		1.6		3.6		2.1		0.3		0.1		---		---		---

Average Number of Days Above 90F/32C

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		109.8		---		---		0.5		7		17.8		24.3		23.6		21.9		12.3		2.6		---		---

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		196.3		0.3		2.1		9.7		19.7		27.9		29.2		29.9		29.8		26.1		17.3		4.1		0.3

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		272.5		7.5		11.1		21.1		27.2		30.8		29.9		31		31		29.3		27.8		18		7.7

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		324.4		18.5		21.1		28.3		29.2		31		30		31		31		29.9		30		25.5		18.9

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		351.8		26.3		25.9		30.3		29.8		31		30		31		31		29.9		30.9		28.6		27

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		361.6		29.7		27.5		31		30		31		30		31		31		30		31		29.7		29.8

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		330.1		31		28		31		29.9		28		21		19.1		21.8		28.4		30.9		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		220.9		31		27.8		30.1		24.1		11.6		1.6		0.5		0.4		8		25.5		29.5		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		146.2		29.8		25		20.7		9.5		0.9		---		---		---		1.2		7.7		21.8		29.6

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		72.9		21		14.1		6.8		1.4		---		---		---		---		---		0.9		8.9		19.8

Average Number of Days Below 32F/0C

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		28.9		10.1		5.6		2.2		0.2		---		---		---		---		---		0.1		2.7		7.9

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		1.9		0.6		0.4		0.1		---		---		---		---		---		---		---		---		0.9

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		0.3		---		---		---		---		---		---		---		---		---		---		---		0.3

Average Precipitation

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		13.4		0.5		0.5		0.3		0.6		1.4		1.7		2.2		2		1.8		1.5		0.6		0.4

Average Number of Days With Precipitation

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		53		3		3		2		3		5		6		7		7		6		5		3		3

Most Reported Precipitation in a Month

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		6.9		1.6		2.3		2.6		2.3		4.6		5.8		5.9		6.3		6.7		6.9		2.4		2.9

Most Precipitation Reported in a Day

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		3.3		1.1		1.4		1.2		1.4		3.2		2.2		2.5		2.7		3		3.3		1.7		1.3

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		29.5		1.7		1.3		0.8		1.4		3		3.9		4.5		4.5		2.7		2.9		1.5		1.3

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

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		28		1		1		1		1		3		4		4		4		3		3		2		1

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

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		6		---		---		---		---		1		1		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		8.9		0.2		0.3		0.2		0.5		0.8		1.1		1.6		1.6		1		1		0.4		0.2

Average Snowfall

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		1.1		0.6		0.2		---		---		---		---		---		---		---		---		0.2		0.1

Average Number of Days With Snow

Years on Record: 30

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

Most Snow Reported in a Month

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
in		13		13		6		1.5		1.5		---		---		---		---		---		---		5		3

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		0.2		0.2		---		---		---		---		---		---		---		---		---		---		---

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		0.1		0.1		---		---		---		---		---		---		---		---		---		---		---

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		0.1		0.1		---		---		---		---		---		---		---		---		---		---		---

Avg. # of Days w/Snow Depth Above 1in/2.5cm

Years on Record: 30

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

Avg. # of Days w/Snow Depth Above 3in/7.5cm

Years on Record: 30

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

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1889		501		338		194		61		5		---		---		---		7		60		242		480

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2381		1		6		39		144		346		470		485		454		300		119		17		1

Growing Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		6331		92		148		332		536		806		919		950		919		743		527		258		102

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.6		11		11.6		12.4		13.3		14.1		14.4		14.2		13.6		12.7		11.8		11.1		10.7

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5.2		3.5		4.4		5.7		6.4		6.7		6.8		6.4		5.9		5.3		4.6		3.9		3.3

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.6		1		1.2		1.4		1.8		2.1		2.2		2.3		2.1		1.8		1.3		1		0.9

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5.6		4.8		5.5		6.4		6.3		6.1		6		5.7		5.6		5.6		5.6		5.1		4.7

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		6.1		5.5		5.9		7.1		7		6.8		6.6		6		5.6		5.6		5.9		6		5.5

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		5.2		3.5		4.4		5.7		6.4		6.7		6.8		6.4		5.9		5.3		4.6		3.9		3.3

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.8		1.1		1.4		1.6		2		2.3		2.5		2.4		2.2		1.9		1.6		1.1		1.1

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		6.3		5.7		6.2		7.3		7.2		6.8		6.4		6.2		5.9		6		6.6		6		5.5

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		7.4		7		7.2		8.9		8.8		8.4		7.5		7.1		6.2		6.4		7.6		7.4		6.9

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.6		3		4		5.3		5.9		5.9		6		5.6		5.4		4.7		3.8		3.4		2.7

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		1.4		0.8		1		1.1		1.4		1.8		2.1		2.1		2		1.7		1.1		0.8		0.7

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.9		4		4.9		5.8		5.8		5.4		5.3		5.1		5.2		4.8		4.3		4.4		3.6

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
kWh/m2		4.8		4.1		4.9		6		5.9		5.1		5.1		4.6		4.8		4.3		4		4.8		3.6