CORNWALL, ONTARIO

Home > North America > Canada > Ontario
Elevation: 64 meters Latitude: 45 00N Longitude: 074 48W

WEATHER

Monthly - Summary

Nearby

Forecast

Monthly - All Data

Climate Summary

Daily Averages

Hourly Data

CURRENT CONDITIONS

Sunrise/Set

05:30 am

08:20 pm
Local Time
8:00 am EDT
14 May, 2024

PRINT THIS DATA

MONTHLY - ALL WEATHER AVERAGES [ Show Summary ]

[ °F ] °C

TEMPERATURE

Average Temperature

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		7.6		-8.5		-6.5		-1		7		13.9		19		21.8		20.7		16.2		9.4		3.1		-4

Average High Temperature

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		12.1		-4.4		-2.2		3.4		11.9		19.3		24.3		27		25.7		21		13.6		6.6		-0.5

Average Low Temperature

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		3.1		-12.6		-10.7		-5.4		2.1		8.5		13.7		16.6		15.7		11.3		5.2		-0.4		-7.5

Highest Recorded Temperature

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		36.5		18		18		26		30.5		33		35		35.6		36.5		34.5		28.5		23.9		20

Lowest Recorded Temperature

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-43.3		-43.3		-35.6		-27		-15		-5.6		0.6		3.3		1.7		-6.1		-8.3		-20		-33.3

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		0.1		---		---		---		---		---		---		---		0.1		---		---		---		---

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		9.4		---		---		---		---		0.5		2.1		4		2.4		0.4		---		---		---

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		11.7		---		---		---		---		0.4		2.7		4.9		3.1		0.7		---		---		---

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		119.9		---		---		0.4		3.2		13		24.2		30.1		28.7		16.4		3.7		0.4		---

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		203.9		0.5		0.6		4.3		17.4		29.8		30		31		31		29.6		21.5		6.8		1.5

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		295.2		9.5		9.9		21.7		29.4		31		30		31		31		30		31		26.1		14.7

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		166.9		30.7		27.8		28.8		16.4		2		0.1		---		---		0.7		9.1		21.9		29.5

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		141.2		29.6		26.5		25.1		10.9		0.5		---		---		---		0.3		4.5		16.5		27.2

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		109.2		27.6		24.3		19.8		4.3		---		---		---		---		---		1		9.5		22.7

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		51.1		18.1		15.6		6.6		0.2		---		---		---		---		---		---		0.7		10

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		9.3		5		2.7		0.4		---		---		---		---		---		---		---		---		1.2

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		0.2		0.1		---		---		---		---		---		---		---		---		---		---		---

PRECIPITATION

Average Precipitation

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1011.5		76.2		60.2		61.5		81.4		87.6		97.3		99		89.1		98.3		93		92.1		75.8

Average Number of Days With Precipitation

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		149.5		14.6		11.5		11.6		11.8		12.9		11.9		10.9		11.2		12.2		12.1		14.2		14.4

Most Precipitation Reported in a Day

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		110.4		53.3		37.6		42.4		41.7		46.8		67.4		73		82		110.4		61		57		35.5

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		150.1		14.2		11.3		11.2		12		13.8		11.9		11.4		11.1		12		12.8		14.6		14

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		64.4		5.2		4.2		4.2		5.7		5.6		5.5		5.9		5.3		6		5.7		6		5.2

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		32.9		2		2		1.7		2.9		3.1		3.4		3.4		3		3.4		3		3		2.3

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		6		0.3		0.1		0.2		0.4		0.4		0.8		0.9		0.7		0.8		0.5		0.5		0.4

PRECIPITATION - RAIN

Average Rainfall

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		831.3		29.1		22		29.5		71.2		87.6		97.3		99		89.1		98.3		91.7		77.8		38.8

Average Number of Rainy Days

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		114.9		3.9		3.8		5.7		11		13.8		11.9		11.4		11.1		12		12.6		12.1		5.7

Most Rain Reported in a Day

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		110.4		37.5		37.6		39.1		33.8		46.8		67.4		73		82		110.4		61		57		35

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		52.2		1.9		1.7		2		5.2		5.6		5.5		5.9		5.3		6		5.6		5		2.6

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		27.8		1		0.7		0.9		2.5		3		3.4		3.4		3		3.4		2.9		2.5		1.2

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		5.5		0.3		0.1		0.1		0.3		0.4		0.8		0.9		0.7		0.8		0.5		0.4		0.3

PRECIPITATION - SNOW

Average Snowfall

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		180		47.2		38.2		31.8		10.2		---		---		---		---		---		1.2		14.3		37

Average Number of Days With Snow

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		44.5		12		9.1		6.7		2		---		---		---		---		---		0.4		4		10.4

Average Snow Cover

Years on Record: 11

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		4.6		15.6		17.5		11.4		0.7		---		---		---		---		---		---		0.5		9.5

Average Snow Cover at Month End

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		3.9		16.3		11.7		3		---		---		---		---		---		---		---		2.4		13.4

Deepest Snow Cover Reported

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		56		48		56		44		30		---		---		---		---		---		---		25		40

Most Snow Reported in a Day

Years on Record: 56

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		53.3		53.3		33.8		38.1		35.6		8.9		---		---		---		---		14.4		36.1		35.5

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		41.7		11.5		8.5		6.6		1.9		---		---		---		---		---		0.3		3.4		9.5

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		11.8		3.2		2.4		2.2		0.6		---		---		---		---		---		0.1		1		2.5

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		4.9		1.1		1.2		0.9		0.4		---		---		---		---		---		---		0.5		0.9

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		0.2		---		---		0.1		---		---		---		---		---		---		---		---		---

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

Years on Record: 11

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		99.1		28.4		27.1		19.8		1.6		---		---		---		---		---		---		1.2		21

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

Years on Record: 11

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		90		25.9		24.6		17.8		1.3		---		---		---		---		---		---		---		20.5

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

Years on Record: 11

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		74.5		22.1		21		14.6		0.8		---		---		---		---		---		---		---		16

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

Years on Record: 11

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		40.2		13.4		10.6		9.4		0.5		---		---		---		---		---		---		---		6.3

DEGREE DAYS

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2352.1		457.3		401.4		330.8		192.5		78.8		20.3		3.1		8		54.2		154.1		257.1		394.5

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		167.1		---		---		---		0.7		8.2		31.8		64.1		48.7		12.7		0.8		---		---

Growing Degree Days

Years on Record: 123

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1072.2		---		---		---		---		86.1		233.3		327.2		275.6		150		---		---		---

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		9.8		11		12.5		14.1		15.5		16.2		15.8		14.5		13		11.4		10.1		9.4

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		12.8		5.8		9.2		13.3		16.3		18.6		20.3		20.3		17.7		13.5		8.7		5.4		4.7

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.2		2.2		3.1		4.7		6.6		8.2		8.8		8.3		7.1		5.5		3.8		2.6		1.9

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.9		11.9		15.4		17.9		17.1		17.1		17.7		18.1		17.5		15.6		12.2		9.1		9.3

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		15.2		12.1		16.1		18		17.2		17.1		18.5		19.3		18		15.4		11.7		8.9		10.2

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		12.8		5.8		9.2		13.3		16.3		18.6		20.3		20.3		17.7		13.5		8.7		5.4		4.7

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.4		2.3		3.4		5		7		8.4		9		8.6		7.4		5.7		4		2.6		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		17.8		14.6		17.4		22.6		21.4		20.2		20.6		20.3		20		18.2		15.2		10.9		12.5

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		20		15.6		18.9		24.8		25		23.3		24.9		24.1		22.8		19.6		15.7		11.1		14.6

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.7		5.2		7.4		11.8		12.9		15.1		17.2		18.3		14.6		11.2		6.4		4.4		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		4.8		2		2.9		3.9		5.8		7.6		8.1		7.8		6.6		5.2		3.7		2.5		1.7

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		11.8		10		11.2		15.2		13		13.8		15		16.3		14.2		12.3		7.9		6.9		6.4

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.5		9.7		10.4		14.3		10.6		11		13.1		15.6		12.2		10.6		6.3		6.1		6.1

NEARBY - MAP

NEARBY - LIST

Cornwall - Hydro Station, Ontario (2 mi / 3 km)
Massena, New York (4 mi / 7 km)
Brasher Falls, New York (5 mi / 8 km)
Helena, New York (5 mi / 8 km)
Avonmore, Ontario (14 mi / 22 km)

GEOBA.SE

Cornwall, Ontario