ST. CATHARINES, ONTARIO

Average Temperature

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		9		-3.6		-3.1		0.5		7.3		13.6		19.1		22		20.9		16.8		10.5		5		-0.6

Average High Temperature

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		13.6		-0.2		0.7		4.8		12.3		19.4		24.7		27.4		26.3		21.8		15.1		8.6		2.5

Average Low Temperature

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		4.4		-7		-6.8		-3.7		2.3		7.7		13.3		16.5		15.6		11.6		5.8		1.3		-3.7

Highest Recorded Temperature

Years on Record: 42

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		37		17.5		18.5		26		31		33.5		37		36.5		35.6		34.5		28.9		22.5		21.5

Lowest Recorded Temperature

Years on Record: 42

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-28		-26		-28		-21.5		-9.5		-3.9		---		5.6		2.2		-1.1		-7.8		-12.2		-26

Average Number of Days Above 95F/35C

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		0.4		---		---		---		---		---		0.1		0.3		---		---		---		---		---

Average Number of Days Above 86F/30C

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		14		---		---		---		0.1		0.3		3.7		6.2		2.6		1.1		---		---		---

Average Number of Days Above 70F/21C

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		126.3		---		---		0.6		3		12.7		25.4		30.3		30.1		19		5		0.3		---

Average Number of Days Above 50F/10C

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		215		1.2		1.4		5.5		17.5		29.8		30		31		31		30		25.4		10.3		2

Average Number of Days Above 32F/0C

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		313.3		12.7		14.1		23.8		29.6		31		30		31		31		30		31		28.6		20.5

Average Number of Days Below 35F/2C

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		158.1		30.1		26.9		27.6		16		4.3		---		---		---		0.6		7.6		18		27.1

Average Number of Days Below 32F/0C

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		131.3		28.1		25		24		11.3		1.8		---		---		---		0.2		4		13.3		23.7

Average Number of Days Below 28F/-2C

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		91.2		23.9		20.6		17.1		4.1		0.1		---		---		---		---		0.8		7.1		17.5

Average Number of Days Below 10F/-12C

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		28.3		11.1		8.7		3.9		---		---		---		---		---		---		---		0.1		4.6

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

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2.2		1.4		0.6		---		---		---		---		---		---		---		---		---		0.2

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

Years on Record: 26

ANNUAL

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

Days

---

---

---

---

---

---

---

---

---

---

---

---

---

Average Precipitation

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		872		58.1		47.3		55.8		74.9		80.6		84.9		84.5		68.7		87.7		75.4		82.6		71.6

Average Number of Days With Precipitation

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		121.7		11		9.3		9.9		11.1		10.6		10.1		8.5		8.5		9.7		9.3		11.4		12.3

Most Precipitation Reported in a Day

Years on Record: 42

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		78.8		43.4		35		38.1		42		57.2		76.2		68		51.1		78.8		57.1		56.9		31

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

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		119.7		11.1		8.4		9.3		10.9		10.7		9.6		8.8		8.5		9.6		10		11.3		11.5

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

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		55.9		3.5		3.3		4		4.9		5.3		5.2		4.7		4		5.4		5		5.8		4.8

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

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		30.7		1.6		1.6		2		2.8		3		3		2.9		2.4		3.1		2.7		3		2.6

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

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		5.4		0.3		0.1		0.2		0.4		0.4		0.7		1		0.6		0.7		0.4		0.4		0.3

Average Rainfall

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		756.4		24.4		25.9		36.2		68.8		80.3		84.9		84.5		68.7		87.7		75.4		74.6		45

Average Number of Rainy Days

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		95.4		3.2		3.8		5.6		9.8		10.7		9.6		8.8		8.5		9.6		10		9.6		6.1

Most Rain Reported in a Day

Years on Record: 42

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		78.8		43.4		34.4		38.1		42		57.2		76.2		68		51.1		78.8		57.1		56.9		31

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

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		48.7		1.4		1.9		2.7		4.5		5.3		5.2		4.7		4		5.4		5		5.6		3.1

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

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		27.6		0.9		1		1.2		2.6		3		3		2.9		2.4		3.1		2.7		3		1.8

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

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		5.3		0.2		0.1		0.1		0.4		0.4		0.7		1		0.6		0.7		0.4		0.5		0.2

Average Snowfall

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		116.2		34		21.5		19.9		6.1		0.2		---		---		---		---		---		8		26.6

Average Number of Days With Snow

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		29.5		8		6		4.3		1.6		0.1		---		---		---		---		---		2.5		7

Average Snow Cover

Years on Record: 1

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		1.8		11		1		5.1		---		---		---		---		---		---		---		---		4.9

Average Snow Cover at Month End

Years on Record: 1

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		0.3		---		2		---		---		---		---		---		---		---		---		---		1.3

Deepest Snow Cover Reported

Years on Record: 2

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		32		32		6		20		---		---		---		---		---		---		---		10		15

Most Snow Reported in a Day

Years on Record: 42

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		38.1		38.1		35		19.1		17.5		3.6		---		---		---		---		2.5		27.9		27.4

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

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		27.7		8.2		5		4.5		1.6		0.1		---		---		---		---		---		2.2		6.2

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

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		7.5		2.2		1.4		1.4		0.3		---		---		---		---		---		---		0.5		1.7

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

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2.9		0.8		0.5		0.7		0.1		---		---		---		---		---		---		0.2		0.6

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

Years on Record: 26

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

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

Years on Record: 1

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		---		17		8		17		---		---		---		---		---		---		---		0.3		---

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

Years on Record: 1

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		---		15		4		10		---		---		---		---		---		---		---		---		---

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

Years on Record: 1

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		---		13		---		8		---		---		---		---		---		---		---		---		---

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

Years on Record: 1

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		---		10		---		1		---		---		---		---		---		---		---		---		---

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		4183		704.4		631.7		552.8		345		149.8		---		---		---		55		248.9		415		600.2

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		190.7		---		---		---		---		---		14.2		103.3		73.2		---		---		---		---

Growing Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1270.5		---		---		---		---		108.5		264.2		361.7		331.6		195		9.5		---		---

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.7		10		11.1		12.5		14		15.3		15.9		15.5		14.4		12.9		11.5		10.2		9.6

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.1		5		8		11.9		16.4		19.8		21.7		21.7		18.8		14.7		9.6		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		5.4		2.5		3.6		5.2		6.8		8.1		8.6		8.1		7.1		5.5		4.1		2.8		2.2

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.4		8.5		11.7		14.4		16.9		18.2		18.9		19.3		18.5		16.8		13.2		9.1		7.6

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.5		7.8		11		13.4		16.4		18.8		20.6		21.5		19.4		17		12.7		8.8		7.1

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.1		5		8		11.9		16.4		19.8		21.7		21.7		18.8		14.7		9.6		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		5.6		2.5		3.7		5.3		7.1		8.5		9		8.7		7.4		5.9		4.2		2.8		2.2

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		17.5		10.8		14.9		18.4		19.5		22		21.7		21.8		21.1		20.4		15.6		12.4		10.8

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		19.7		10.6		15.2		19.6		21		26.8		27.3		27.2		24.6		23		16.1		13		11.3

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.6		3.8		6.5		8.4		13.5		15.9		17.2		17.1		16.9		11.9		7.7		4		3.4

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		4.9		2.3		3.4		4.7		6.4		7.2		7.7		7.4		6.4		4.9		3.9		2.6		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		11.1		5.8		8.9		9.5		13.6		14.6		15.1		15.3		16.5		13.1		9.8		5.4		5.3

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		9.3		4.7		7.2		6.7		11.1		12		12.9		13.4		15.7		11.3		8.2		4.2		4.4