THORNHILL, ONTARIO

Average Temperature

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		8.6		-5		-3.7		0.5		6.7		13.1		19.2		21.6		20.9		16.8		9.8		4.1		-1.4

Average High Temperature

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		13.4		-1.1		0.5		5.1		12		18.8		24.9		27.3		26.5		22.3		14.5		7.8		2

Average Low Temperature

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		3.7		-8.8		-7.8		-4.1		1.4		7.3		13.5		15.9		15.3		11.3		5.1		0.4		-4.9

Highest Recorded Temperature

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		37.5		15.5		15		25.5		29.5		34		35.5		36		37.5		34.5		29.5		23		18

Lowest Recorded Temperature

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-26		-26		-23.5		-25.5		-10		-2.5		3		7		5.5		-0.5		-5.5		-12.5		-26

Average Number of Days Above 95F/35C

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		0.6		---		---		---		---		---		0.1		0.1		0.4		---		---		---		---

Average Number of Days Above 86F/30C

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		16.7		---		---		---		---		0.4		4.4		6.7		4		1.2		---		---		---

Average Number of Days Above 70F/21C

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		125.2		---		---		0.9		2.4		11.8		24.8		30.3		30.1		19.9		5		0.2		---

Average Number of Days Above 50F/10C

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		213.5		1.2		0.9		6.5		18.4		29.7		30		31		31		29.9		24		9.5		1.5

Average Number of Days Above 32F/0C

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		315.1		14.2		15		24.4		29.3		31		30		31		31		30		31		28.4		19.9

Average Number of Days Below 35F/2C

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		165.9		30.1		27.7		27.9		17.8		4.3		---		---		---		0.5		9		19.8		28.9

Average Number of Days Below 32F/0C

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		139.8		28.4		26.3		25.3		12.4		1.8		---		---		---		0.1		4.8		15.5		25.2

Average Number of Days Below 28F/-2C

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		100.1		23.8		22.7		18.8		5.6		0.1		---		---		---		---		0.8		8.7		19.6

Average Number of Days Below 10F/-12C

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		31.5		12.3		9.4		4.3		---		---		---		---		---		---		---		0.2		5.3

Average Number of Days Below -4F/-20C

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		3.3		2.3		0.8		0.1		---		---		---		---		---		---		---		---		0.2

Average Number of Days Below -22F/-30C

Years on Record: 12

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Average Precipitation

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		871.9		72.5		53.3		52.4		74.1		90.3		85.5		80.2		74		82.3		66.7		79.4		61.3

Average Number of Days With Precipitation

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		147.9		15		11.7		12.6		12.3		12.2		11.6		10.3		10.7		11.3		12		13.5		14.6

Most Precipitation Reported in a Day

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		140.6		32.2		30.6		27.2		38.8		71		32.8		53.8		140.6		68		60.6		58.2		38.2

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

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		152.7		16.7		12.3		12.4		12.7		12.9		11.9		11.6		10.1		11.1		12.8		14.4		13.9

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

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		52.5		4.5		3.3		3.5		4.8		5.4		4.9		4.3		3.9		4.8		3.8		5.2		4.1

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

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		27		2.1		1.3		1.7		2.1		3		3.1		2.4		2.1		2.7		2		2.9		1.9

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

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		5.9		0.7		0.3		0.1		0.5		0.8		0.6		0.7		0.6		0.7		0.4		0.5		0.2

Average Rainfall

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		746.2		37.2		31.9		29.2		64.9		90.3		85.5		80.2		74		82.3		66.5		69.6		34.6

Average Number of Rainy Days

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		118.1		6.5		5.5		6.7		11.3		12.9		11.9		11.6		10.1		11.1		12.7		11		6.9

Most Rain Reported in a Day

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		140.6		32.2		28.4		23.2		38.8		71		32.8		53.8		140.6		68		60.6		57.6		38.2

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

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		44.3		2.1		2		2		4.4		5.4		4.9		4.3		3.9		4.8		3.8		4.4		2.2

Avg. No. of Days w/Rain Above 0.4in/10mm

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		24		1.2		1.2		0.9		1.8		3		3.1		2.4		2.1		2.7		2		2.6		1.1

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

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		5.2		0.4		0.1		---		0.4		0.8		0.6		0.7		0.6		0.7		0.4		0.5		0.1

Average Snowfall

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		125.2		37.8		21.1		23.7		5.5		---		---		---		---		---		0.2		10.5		26.5

Average Number of Days With Snow

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		43.4		11.9		8.8		6.9		2.1		0.1		---		---		---		---		0.3		3.4		10

Average Snow Cover

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		2		8.8		7.8		3.7		0.1		---		---		---		---		---		---		0.5		3.3

Average Snow Cover at Month End

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		1.7		10.6		4.8		0.1		---		---		---		---		---		---		---		---		4.6

Deepest Snow Cover Reported

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		52		52		29		28		9		---		---		---		---		---		---		18		29

Most Snow Reported in a Day

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		33		33		18.4		22.2		10.6		0.2		---		---		---		---		1.6		18.2		28.4

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

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		46		13.3		8.8		7.2		2.7		0.1		---		---		---		---		0.2		4.6		9.2

Avg. No. of Days w/Snowfall Above 2in/5cm

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		7.3		1.9		1.3		1.6		0.3		---		---		---		---		---		---		0.5		1.7

Avg. No. of Days w/Snow Above 3.9in/10cm

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2.5		0.8		0.3		0.7		0.1		---		---		---		---		---		---		0.2		0.6

Avg. No. of Days w/Snowfall Above 10in/25cm

Years on Record: 12

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

Av. # of Days w/Snow Depth Above 0.4in/10mm

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		73		22.5		22.3		12.3		1.5		---		---		---		---		---		---		2.6		11.9

Avg. # of Days w/Snow Depth Above 2in/5cm

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		50.6		16.8		16.3		8.8		0.1		---		---		---		---		---		---		1.2		7.5

Av. # of Days w/Snow Depth Above 3.9in/10cm

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		34		11.7		11.6		5.3		---		---		---		---		---		---		---		0.7		4.7

Av. # of Days w/Snow Depth Above 7.8in/20cm

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		8.3		4.3		1.5		1.5		---		---		---		---		---		---		---		---		1.1

Heating Degree Days

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		3758.2		723.2		622.3		552.7		348.9		162.1		---		---		---		45.9		264.4		426.9		611.6

Cooling Degree Days

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		207.1		---		---		---		---		---		26.1		101.4		79.7		---		---		---		---

Growing Degree Days

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1273.6		---		---		---		---		96.1		276		359.6		337.9		204		---		---		---

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.7		9.9		11		12.5		14		15.3		16		15.6		14.4		12.9		11.4		10.2		9.5

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		12.7		5.1		8.2		11.5		15.9		18.7		20.9		20.8		18.2		14		9.2		5.4		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		5.4		2.4		3.5		5.1		6.8		8.2		8.7		8.3		7.1		5.5		4		2.7		2

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.1		9.4		12.6		14.3		16.4		17.2		18.1		18.6		17.9		16.1		12.8		8.7		7.3

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.1		8.9		12.2		13.1		15.8		17		19.3		20.1		18.5		16.1		12.3		8.3		7.5

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		12.7		5.1		8.2		11.5		15.9		18.7		20.9		20.8		18.2		14		9.2		5.4		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		5.5		2.4		3.5		5.2		7		8.4		9		8.7		7.4		5.8		4.1		2.7		2.1

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		17		11.1		15.3		17.9		21		19.5		20.7		21		20.4		20.6		16.2		10.3		10.3

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		11		16.1		18.3		24.1		21.5		25.1		25.5		23.4		23.6		17.1		10.3		11.5

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.3		4.1		6.6		8.6		13.2		15.4		16.4		17.6		16.1		10.9		7.4		3.9		3.1

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		4.9		2.3		3.2		4.8		6		7.8		8.1		7.6		6.6		4.7		3.7		2.5		1.9

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.9		6.7		9.3		9.7		13.3		14		14.4		15.7		15.7		11.9		9.5		5.5		4.8

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		9.2		5.7		7.8		7.3		10.8		11.3		11.8		14.2		14.5		9.8		8		4.4		4.2