JEFFERSON ISLAND, MONTANA

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Elevation: 1300 meters Latitude: 45 52N Longitude: 111 57W

WEATHER

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CURRENT CONDITIONS

Sunrise/Set

08:03 am

10:44 pm
Local Time
7:00 pm EDT
8 May, 2024

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MONTHLY - ALL WEATHER AVERAGES [ Show Summary ]

[ °F ] °C

TEMPERATURE

Average Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		7.6		-2.7		-1.5		3.1		7		11.4		15.9		20.4		18.4		13.1		7.8		1.3		-3.9

Average High Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		16.2		4.2		6.1		10.7		15.5		20.3		25.2		31.3		29.2		23.4		17.2		8.2		2.8

Average Low Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-1.1		-9.6		-9.1		-4.6		-1.5		2.6		6.7		9.6		7.7		2.8		-1.7		-5.5		-10.7

Highest Recorded Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		32.9		4.9		8.3		12.9		19.1		22.2		29.4		32.9		32.8		26.3		18		12.2		5.6

Lowest Recorded Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-22.8		-22.8		-18.5		-7.3		-3.9		2.8		6.8		9.1		8.6		4.8		-0.6		-11.4		-16.6

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

Average Number of Days Above 90F/32C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		27.2		---		---		---		0.2		0.8		3.1		14.6		6.7		1.7		---		---		---

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		80.8		---		---		---		0.9		5.6		12.1		27.1		23.8		10.4		1		---		---

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		129.3		---		---		0.4		5.6		13.3		22.5		30.1		29.3		19.7		8.3		0.1		---

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		188.4		0.1		1.8		5.4		15.8		24.1		29		31		30.9		26.4		19.8		4		---

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		247.2		3.8		9		18.2		23.6		29.6		30		31		31		29		26.8		12.2		2.9

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		312.2		16.4		18.8		27.6		29.2		30.9		30		31		31		30		30.7		22.4		14.2

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		365		31		28		31		30		31		30		31		31		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		364.5		31		28		31		30		31		29.8		30.8		30.9		30		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		336		31		28		30.9		29.8		30.5		25.4		16.4		23.4		29.2		30.8		29.7		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		261.1		30.6		27.5		30.4		27.8		21.1		7.6		1.7		5.1		20.5		29		28.8		30.9

Average Number of Days Below 32F/0C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		186.7		27.9		25.3		26.4		19.3		7.6		0.6		---		---		6.1		19.9		24.5		29

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		85		19.4		16.6		8.5		3.4		0.4		---		---		---		0.6		4.1		10.8		21.3

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		37.7		10.3		7.9		2.6		0.4		---		---		---		---		---		0.1		4.7		11.7

Average Number of Days Below 0F/-17C

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		16.7		4.7		3.9		0.7		0.1		---		---		---		---		---		---		1.8		5.5

PRECIPITATION

Average Precipitation

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		292		11		8		14		24		50		47		37		33		28		17		12		12

Average Number of Days With Precipitation

Years on Record: 14

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		75		3		3		9		7		11		9		6		6		7		5		5		4

Most Reported Precipitation in a Month

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		142		38		23		43		63		142		97		95		81		77		60		38		29

Least Reported Precipitation in a Month

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		---		---		---		3		4		15		4		4		---		1		---		3		2

Most Precipitation Reported in a Day

Years on Record: 14

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		45.7		16.5		10.2		12.7		25.4		45.7		32.3		34.3		20.3		31.2		20.3		10.4		11.4

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

Years on Record: 14

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		45		1		2		5		4		8		6		4		4		5		2		2		2

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

Years on Record: 14

		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 1in/25mm

Years on Record: 14

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

PRECIPITATION - SNOW

Average Snowfall

Years on Record: 14

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		61.5		8.1		6.3		20.1		2.5		---		---		---		---		1.3		2		10.7		10.4

Most Snow Reported in a Month

Years on Record: 14

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		45.7		33		20.3		45.7		12.7		---		---		---		---		14		10.2		14		22.9

DEGREE DAYS

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		7306		1173		998		853		612		386		164		23		61		288		591		918		1241

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		247		---		---		---		---		3		33		138		67		6		---		---		---

Growing Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1805		---		1		4		35		140		325		581		471		202		40		6		---

SKY CONDITIONS

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.8		9.7		10.9		12.5		14.1		15.6		16.3		15.9		14.6		13		11.4		10		9.3

SOLAR RADIATION

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.2		5.8		9.2		13.4		17.2		20.1		22.5		24.1		20.8		15.8		10.4		6.4		5

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		6.2		3.3		4.6		6.4		6.9		8.8		9.3		9.2		8		6.8		4.9		3.5		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		15.9		10.2		13.9		16.6		18.1		18.5		19.5		21.4		20.7		18.2		14.1		10.5		8.8

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15.8		8.8		12.5		14.9		18.5		18.6		21.3		24.2		22		17.7		13.4		9.2		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		14.2		5.8		9.2		13.4		17.2		20.1		22.5		24.1		20.8		15.8		10.4		6.4		5

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		6.6		3.5		4.9		6.7		7.3		9		9.5		10.3		8.6		7.4		5.4		3.8		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		18.1		11.3		15.4		18.6		21.3		21.6		22.2		24.4		22.9		21.2		16.4		12.4		9.6

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		18.6		9.9		13.9		17		22.8		24.1		26.2		27.9		24.8		21.2		15.9		10.9		8.9

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		12.1		5.1		8.2		11.6		15.2		17.6		18.9		18.5		18.8		12.3		9.1		5.5		4.4

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.9		3		4.2		6		6.7		8.7		9.2		8.9		7.9		6.2		4.5		3.2		2.6

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.4		8.8		12.3		14.3		15.8		16.1		16.5		16.4		18.6		13.8		12.1		8.7		7.5

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		12.2		7.4		10.8		11.8		15.2		14.3		15.2		15.1		18.7		12		11.3		7.6		6.7

NEARBY - MAP

NEARBY - LIST

Cardwell, Montana (0 mi / 1 km)
Sunlight, Montana (7 mi / 11 km)
Whitehall, Montana (12 mi / 20 km)
Pony, Montana (14 mi / 22 km)
Three Forks, Montana (23 mi / 37 km)

GEOBA.SE

Jefferson Island, Montana