ROY, MONTANA

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Elevation: 942 meters Latitude: 47 25N Longitude: 108 50W

WEATHER

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Climate Summary

CURRENT CONDITIONS

Sunrise/Set

08:00 am

10:24 pm
Local Time
5:35 pm EDT
29 April, 2024

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MONTHLY - ALL WEATHER AVERAGES [ Show Summary ]

[ °F ] °C

TEMPERATURE

Average Temperature

Years on Record: 68

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		6.8		-7.6		-4.1		---		6.6		11.9		16.5		20.8		20.1		14.1		8.3		0.1		-5

Average High Temperature

Years on Record: 68

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		14.4		-0.8		2.7		6.8		14.1		19.5		24.2		29.7		29.3		22.7		16.3		6.9		1.7

Average Low Temperature

Years on Record: 68

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-0.8		-14.3		-10.9		-6.8		-0.8		4.4		8.8		11.9		11		5.5		0.2		-6.7		-11.6

Highest Recorded Temperature

Years on Record: 68

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		41.7		20.6		22.2		27.2		32.2		35.6		39.4		40.6		41.7		39.4		33.3		25.6		20.6

Lowest Recorded Temperature

Years on Record: 68

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-40.6		-40.6		-39.4		-36.1		-20.6		-12.2		-1.7		2.2		-1.1		-8.9		-23.9		-33.9		-40.6

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		1.9		---		---		---		---		---		0.2		1.1		0.6		---		---		---		---

Average Number of Days Above 90F/32C

Years on Record: 68

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		25.9		---		---		---		---		0.3		2.2		10.6		10.5		2.3		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		73.4		---		---		---		0.9		4.2		10		23.7		23.4		9.4		1.8		---		---

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		125.9		---		0.1		0.7		4.8		12.3		22.3		29.3		29.3		19.4		6.6		1.1		---

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		183.3		0.7		1.8		5.7		12.9		24.2		28.8		30.9		30.8		26.5		16.2		4.3		0.5

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		241.1		4.5		7.2		15.2		22.9		29		30		31		31		28.7		25.3		12		4.3

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		295.4		13.9		14.8		23.3		28.2		30.7		30		31		31		29.7		29.2		20.5		13.1

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		364.7		31		28		31		30		31		30		30.9		30.8		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		354.5		31		28		31		30		31		28.7		26.4		27		29.5		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		302.6		31		28		30.9		29.8		28.4		18.2		8.3		11.5		25.3		30.3		29.9		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		230.9		30.8		27.8		30.2		26.5		15.2		2.3		0.2		1.1		11.6		25.1		29.1		31

Average Number of Days Below 32F/0C

Years on Record: 68

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		180.8		29.6		26.8		27.3		17.8		5		0.2		---		---		3.5		14.9		26		29.6

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		89.8		21.7		16.5		10.3		2.3		---		---		---		---		0.2		3.5		13.1		22.2

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		47.8		14		9.5		4.2		0.3		---		---		---		---		---		0.5		5.7		13.6

Average Number of Days Below 0F/-17C

Years on Record: 68

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		31.4		11.7		6.5		3.2		---		---		---		---		---		---		0.1		2.5		7.3

PRECIPITATION

Average Precipitation

Years on Record: 68

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		352		12		9		17		28		64		71		45		34		30		20		12		11

Average Number of Days With Precipitation

Years on Record: 68

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		74		5		4		6		6		10		11		7		6		6		4		4		5

Most Reported Precipitation in a Month

Years on Record: 68

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		207		50		26		53		91		192		207		147		142		132		71		38		58

Least Reported Precipitation in a Month

Years on Record: 68

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		---		---		---		---		---		3		11		2		---		---		---		---		---

Most Precipitation Reported in a Day

Years on Record: 68

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		68.8		16.8		18.3		40.6		49.3		66		68.8		55.1		55.6		56.9		41.1		18		16.8

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		37.2		1.5		1.1		2.5		3.2		5.9		6.1		4.6		3.5		3.2		2.6		1.5		1.5

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

Years on Record: 68

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		38		2		1		2		3		6		7		4		4		3		2		2		2

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

Years on Record: 68

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		6		---		---		---		---		1		2		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		6.2		---		---		0.1		0.4		1.5		1.4		1.3		0.6		0.5		0.2		---		0.2

PRECIPITATION - SNOW

Average Snowfall

Years on Record: 68

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		107.4		20.8		14.7		18.8		12.7		2.3		0.2		---		---		0.5		5.8		12.9		18.5

Average Number of Days With Snow

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		16.1		3.2		2.2		3.2		1.1		0.5		---		---		---		0.1		0.8		2.3		2.7

Average Snow Cover

Years on Record: 51

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		5		15		15		7		2		---		---		---		---		---		---		2		7

Most Snow Reported in a Month

Years on Record: 68

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		96.5		71.1		40.6		55.9		96.5		25.4		15.2		---		---		7.6		35.6		53.3		88.9

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		15.4		2.9		2.1		3		1.1		0.5		---		---		---		0.1		0.8		2.2		2.7

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		4.2		0.8		0.5		0.9		0.5		0.1		---		---		---		---		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		1.2		0.2		0.2		0.2		0.2		---		---		---		---		---		0.1		---		0.3

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		54.9		15.2		11.4		6.6		1.8		0.3		---		---		---		---		1.6		5.4		12.6

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		39.7		11.3		8.3		5.4		1.5		0.1		---		---		---		---		0.8		3.5		8.8

Avg. # of Days w/Snow Depth Above 5in/12.7cm

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		28.5		8.7		5.9		3.7		1.1		0.1		---		---		---		---		0.7		1.9		6.4

Avg. # of Days w/Snow Depth Above 10in/25cm

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		12.4		3.7		2.9		1.1		0.4		---		---		---		---		---		0.1		0.8		3.4

DEGREE DAYS

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		7648		1328		1099		936		620		359		134		27		41		237		585		963		1319

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		433		---		---		---		---		7		53		178		162		30		2		---		---

Growing Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2139		1		1		7		39		168		372		617		587		272		69		8		---

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		9.6		10.9		12.5		14.2		15.8		16.6		16.1		14.7		13		11.3		9.9		9.1

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		13.8		5		8.3		12.3		17		20.6		22.8		23.8		20.5		15		9.7		5.8		4.2

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		2.9		4.3		6.2		7.6		8.9		9.4		9.2		8		6.6		4.8		3.3		2.6

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15.2		8.6		12.5		15.1		17.7		18.9		19.7		21.2		20.4		17.4		13.3		9.6		7.5

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		7.5		11.2		13.2		17		19.5		21.8		24		21.7		16.7		12.6		8.4		6.8

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.8		5		8.3		12.3		17		20.6		22.8		23.8		20.5		15		9.7		5.8		4.2

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		3.3		4.7		6.6		7.7		9.1		9.6		10		8.4		7.3		5.1		3.7		2.9

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		17.3		10		14.2		17.8		20.2		21.4		21.8		23.8		22.3		20.9		15		11.2		9.1

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		9.3		13.4		16.7		21		23.9		25.7		27.6		24.3		21		14.5		10.2		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		11.6		4.4		7.1		10.7		14.8		16.9		19.6		18.1		18.6		11.7		8.6		4.8		3.6

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		2.7		3.8		5.8		7.5		8.8		9.3		9		7.9		6.1		4.4		2.9		2.3

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		12.6		7.4		10.7		12.7		15.2		15.4		17		16.1		18.5		13.1		11.6		7.4		6.1

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		11.2		6.3		9.1		10.4		13		13.1		16.3		14.5		18.6		11.3		10.7		6.3		5.3

NEARBY - MAP

NEARBY - LIST

Sand Creek Wildlife Station Airport, Montana (12 mi / 19 km)
Valentine, Montana (13 mi / 22 km)
Bear Creek Reservoir, Montana (14 mi / 22 km)
Wild Horse Lake, Montana (17 mi / 27 km)
Box Elder Creek, Montana (20 mi / 32 km)

GEOBA.SE

Roy, Montana