MOUNT WILSON, CALIFORNIA

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Elevation: 1740 meters Latitude: 34 14N Longitude: 118 04W

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CURRENT CONDITIONS

Sunrise/Set

08:51 am

10:46 pm
Local Time
9:26 pm EDT
13 May, 2024

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MONTHLY - ALL WEATHER AVERAGES [ Show Summary ]

[ °F ] °C

TEMPERATURE

Average Temperature

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		13.6		6.8		6.9		7.6		10.1		14		18.8		22.7		22.2		20.1		15.5		10.7		7.4

Average High Temperature

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		18.5		11.2		11.4		12.5		15.3		19.4		24.2		27.8		27.4		25.3		20.5		15.3		11.8

Average Low Temperature

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		8.6		2.4		2.4		2.8		4.8		8.7		13.4		17.6		17		14.8		10.4		6.1		3

Highest Recorded Temperature

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		38.9		25		26.7		28.3		30		33.3		36.1		38.9		38.3		36.7		33.9		28.9		25.6

Lowest Recorded Temperature

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-12.8		-12.8		-11.7		-10		-7.8		-5.6		-1.7		3.3		2.8		1.1		-7.8		-9.4		-12.2

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

Average Number of Days Above 90F/32C

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		7.7		---		---		---		---		0.1		0.9		2.8		2.4		1.4		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		91.2		---		---		0.1		1.3		6.1		14.4		24.3		23.8		16.3		4.7		0.4		---

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		173.1		1.3		1.9		3.9		9.5		18		26.4		30.6		30.5		26.3		17.4		6.1		1.3

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		254		10.9		9.5		14.9		18.9		26.2		29		31		31		28.9		25.9		17.5		10.4

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		315.4		21.6		18.2		23.3		25.3		29.1		29.8		31		31		29.7		29.6		26		20.8

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		353.5		28.5		25.1		28.9		29.2		30.9		30		31		31		30		31		29.5		28.5

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		355.5		31		28		31		30		31		29		27.1		27.3		29.1		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		287		31		28		31		29.6		27.5		18.9		7.8		9.3		16.3		26.9		29.8		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		205.8		29.5		26.8		27.9		23.8		17.4		6.6		0.6		0.7		5.2		14.1		24		29.2

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		119.7		19.5		18.8		18.3		14.8		7.6		1.6		---		0.1		1		5.1		13.2		19.7

Average Number of Days Below 32F/0C

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		55.5		10.6		10.1		10.9		7		2.2		0.2		---		---		---		1		4.3		9.3

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		2.3		0.5		0.6		0.2		0.1		---		---		---		---		---		---		0.1		0.8

PRECIPITATION

Average Precipitation

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		860		178		195		142		64		21		4		2		4		17		30		89		115

Average Number of Days With Precipitation

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		44		7		7		7		5		2		1		---		1		1		3		4		6

Most Reported Precipitation in a Month

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		961		961		780		639		420		275		46		43		87		284		233		760		429

Most Precipitation Reported in a Day

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		303.8		303.8		248.7		225		105.4		89.4		45.2		28.2		47		137.2		135.4		187.2		173.2

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		31.6		5.1		6.3		4.8		2.9		1.2		0.5		0.2		0.3		0.8		1.8		3		4.7

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

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		29		5		5		5		3		1		---		---		---		1		2		3		4

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

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		16		3		3		3		2		---		---		---		---		---		1		2		2

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		17.8		3.2		3.9		3		1.4		0.5		0.2		---		0.1		0.3		0.9		1.7		2.6

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

Years on Record: 63

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

PRECIPITATION - SNOW

Average Snowfall

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		32.5		8.9		6.1		7.6		3.6		0.5		---		---		---		---		---		1.5		4.3

Most Snow Reported in a Month

Years on Record: 63

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		101.6		101.6		55.9		63.5		53.3		17.8		---		---		---		---		2.5		38.6		63.5

DEGREE DAYS

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		3674		595		559		533		404		223		69		7		8		57		206		410		604

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		976		---		---		1		9		53		141		281		274		165		47		5		---

Growing Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		3774		56		50		92		158		331		527		739		732		562		333		138		56

SKY CONDITIONS

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.6		10.6		11.4		12.4		13.5		14.4		14.9		14.6		13.8		12.8		11.7		10.8		10.4

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		19.3		10.9		13.9		19.2		23.9		26.6		27.7		26.1		23.9		20.4		15.9		12.3		10.2

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		4.9		3		3.9		4.7		5.7		6.5		6.8		7		6.2		5.1		4		3		2.7

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		21.2		16.7		18.8		22.6		24.2		24.1		23.9		23.1		23.1		22.5		20.8		18.3		16.3

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		24.9		19.2		20.4		25.4		28.7		30.1		30.9		28.5		27.2		25.5		23		21.4		18.9

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		19.3		10.9		13.9		19.2		23.9		26.6		27.7		26.1		23.9		20.4		15.9		12.3		10.2

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.8		3.6		4.6		5.9		6.7		7.8		8.2		8.2		7		5.9		4.7		3.5		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		24.2		18.9		23.5		25.7		26.4		26.1		26.4		26.2		26.5		25.4		25.7		21.1		18.9

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		30.9		22.7		27.8		30.9		33.3		35		37.9		36.4		34.7		31		31.4		25.9		23

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		16.9		8.9		11.4		15.9		21.2		23.3		24.3		22.8		21.9		18.3		14.2		10.9		8.8

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		3.8		2.6		2.9		3.7		4.7		5.4		5.3		5.3		4.7		4.1		2.7		2.4		2.2

Minimum 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		12.6		14.7		18		21.4		21.2		21.2		20.4		21.1		19.8		18		15.5		13.5

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		19.1		12.9		14		17.5		22.8		23.3		23.9		21.8		22.8		20.6		18.4		16.9		14.5

NEARBY - MAP

NEARBY - LIST

Mount Wilson - North, California (2 mi / 3 km)
Mount Wilson - Northwest, California (2 mi / 3 km)
Sierra Madre, California (2 mi / 3 km)
Arcadia Wilderness Park, California (3 mi / 5 km)
Altadena, California (5 mi / 8 km)

GEOBA.SE

Mount Wilson, California