ST. THOMAS, ONTARIO

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Elevation: 236 meters Latitude: 42 46N Longitude: 081 07W

WEATHER

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CURRENT CONDITIONS

Sunrise/Set

05:57 am

08:44 pm
Local Time
1:02 pm EDT
19 May, 2024

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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		8.7		-4.7		-3.6		1		7.6		13.7		18.8		21.2		20.3		16.4		10.1		4.5		-1.4

Average High Temperature

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		13.6		-0.8		0.7		5.6		13		19.6		24.7		27		25.9		21.8		15.1		8.3		2

Average Low Temperature

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		3.7		-8.5		-7.8		-3.7		2.1		7.7		12.9		15.4		14.7		10.9		5.1		0.6		-4.8

Highest Recorded Temperature

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		38		14.5		18.5		24.5		29.5		32.5		38		37		34.5		33		26.5		21.5		18.5

Lowest Recorded Temperature

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-31		-31		-30		-25.5		-16		-3		1		6		---		-2		-7		-13.5		-27.5

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

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		7.3		---		---		---		---		0.2		1.8		3.5		1.7		0.1		---		---		---

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		8.7		---		---		---		---		0.2		2.2		3.9		2.2		0.2		---		---		---

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		127.6		---		---		0.5		3.5		13.7		25.8		30.6		29.6		19.4		4.5		0.1		---

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		219.4		0.7		1		6.9		20.7		29.9		30		31		31		30		25.8		10.5		1.9

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		318.4		14.6		15.4		25.7		29.7		31		30		31		31		30		31		28.6		20.3

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		164.1		30.2		27.6		27.1		16.2		4.3		0.1		---		0.1		0.8		9.6		19.6		28.5

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		135.4		27.9		25.5		23.9		11.1		1.9		---		---		---		0.2		4.7		15.1		25.2

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		95.4		23.9		21.3		17.6		4.8		0.1		---		---		---		---		1.2		8.1		18.5

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		31.2		11.5		9.3		3.8		0.1		---		---		---		---		---		---		0.4		6.1

Average Number of Days Below 0F/-17C

Years on Record: 9

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		10		4		3		1		---		---		---		---		---		---		---		---		1

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		4.5		2.2		1.5		0.3		---		---		---		---		---		---		---		---		0.5

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

PRECIPITATION

Average Precipitation

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		993		73.5		63.2		65.7		83.4		87.3		92.4		83		80		94.8		85.7		98.7		85.3

Average Number of Days With Precipitation

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		162		14.8		11.9		12.4		15.9		13.1		11.6		12.8		11.4		14		14.1		15.5		14.6

Most Precipitation Reported in a Day

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		89.6		43.5		40.4		32		55.8		65.4		77.4		66.6		57		89.6		72		52.2		34.4

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		159		14.7		11.4		12.1		15.2		14.1		11.1		12.4		11.1		13.2		13.9		15.3		14.5

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		61.5		5		4.2		4.9		5.5		5.4		5.1		4.7		4.5		5.2		5.4		6.1		5.7

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		32.5		2.1		2.2		2.3		2.5		2.9		3		2.7		2.7		3.2		3		3.3		2.7

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		6.2		0.3		0.2		0.2		0.4		0.5		0.9		0.6		0.6		0.8		0.5		0.7		0.4

PRECIPITATION - RAIN

Average Rainfall

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		874.4		35.2		37.3		48.5		79.9		87.3		92.4		83		80		94.8		85.4		92.4		58.1

Average Number of Rainy Days

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		132.9		6		5.7		9.1		14.3		14.1		11.1		12.4		11.1		13.2		13.9		13.5		8.5

Most Rain Reported in a Day

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		89.6		43.5		40.4		32		55.8		65.4		77.4		66.6		57		89.6		72		52.2		34.4

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		53		2.4		2.4		3.4		5.3		5.4		5.1		4.7		4.5		5.2		5.3		5.7		3.6

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		29.1		1		1.4		1.7		2.4		2.9		3		2.7		2.7		3.2		3		3.2		2.1

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		6.1		0.2		0.2		0.2		0.4		0.5		0.9		0.6		0.6		0.8		0.5		0.7		0.4

PRECIPITATION - SNOW

Average Snowfall

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		118.6		38.3		25.9		17.1		3.5		---		---		---		---		---		0.3		6.3		27.3

Average Number of Days With Snow

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		32.2		9.6		7.3		4.1		1.3		---		---		---		---		---		0.2		2.5		7.3

Average Snow Cover

Years on Record: 12

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		1.7		7.4		7.4		2.1		---		---		---		---		---		---		---		0.2		3.2

Average Snow Cover at Month End

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		1.3		8		2.9		---		---		---		---		---		---		---		---		0.5		4.5

Deepest Snow Cover Reported

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		48		48		27		23		7		---		---		---		---		---		---		13		27

Most Snow Reported in a Day

Years on Record: 26

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
cm		28		25		24		21.5		12		---		---		---		---		---		2.5		16.4		28

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		31.8		9.6		7		4.2		1.3		---		---		---		---		---		0.2		2.3		7.3

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		8.3		2.6		1.8		1.3		0.2		---		---		---		---		---		---		0.4		2

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		1		0.7		0.5		0.1		---		---		---		---		---		---		0.1		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		---		---		---		---		---		---		---		---		---		---		---		---

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		67.1		20		14.5		3		0.1		---		---		---		---		---		---		0.4		29

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		48		17		7.5		2.5		---		---		---		---		---		---		---		---		21

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		30		15		4.5		0.5		---		---		---		---		---		---		---		---		10

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		4.5		---		0.5		---		---		---		---		---		---		---		---		---		4

HUMIDITY

Average Relative Humidity

Years on Record: 10

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		79		87		86		79		74		73		75		73		75		78		81		85		86

Average Dew Point

Years on Record: 10

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		4		-6		-7		-3		1		8		14		16		15		11		6		1		-5

DEGREE DAYS

Heating Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2064.5		388.3		339.8		293.1		176.5		78.7		20.8		3.5		7.3		45.6		138.2		232.2		340.6

Cooling Degree Days

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		153		---		---		---		0.6		6.9		30		55.6		44.9		14.6		0.4		---		---

Growing Degree Days

Years on Record: 54

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		1139.4		---		---		---		---		86.1		250		327.2		292.8		183.3		---		---		---

SKY CONDITIONS

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.7		10		11.1		12.5		13.9		15.2		15.9		15.5		14.4		12.9		11.5		10.2		9.6

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		13.1		6.1		9.2		12.3		15.6		18.8		21.4		21.2		18		14.5		9.5		5.5		4.8

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		3.5		5.2		7		8.2		8.7		8.2		7.2		5.6		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		14.7		11.5		14.1		15.2		15.9		17.2		18.6		18.9		17.7		16.6		13		8.6		9

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.7		11.5		14.3		14.5		14.8		16.9		19.9		20.6		17.9		16.7		12.4		8		8.9

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.1		6.1		9.2		12.3		15.6		18.8		21.4		21.2		18		14.5		9.5		5.5		4.8

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		3.6		5.3		7.1		8.5		9		8.7		7.5		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		14.3		16		18.4		19.2		19.8		21.1		21.2		20.4		21		15.9		10.3		11.9

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		19.3		15.2		16.7		19.5		20.4		22		25.8		25.7		23		24.2		16.6		10.2		12.3

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.7		5.6		7.6		9.6		12.7		15.7		17.4		17.2		16.1		11.1		7.5		4.1		3.8

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5		2.3		3.3		4.8		6.5		7.8		8		7.6		6.7		4.7		3.8		2.6		2.1

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		11.5		10		10.6		10.9		12.8		14.4		15.2		15.4		15.6		11.9		9.5		5.7		6.3

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		9.9		9.6		9.9		8.7		9.9		11.7		13.1		13.5		14.2		9.7		7.9		4.5		5.5

NEARBY - MAP

NEARBY - LIST

Aylmer, Ontario (6 mi / 11 km)
Forest, Ontario (8 mi / 13 km)
Port Stanley, Ontario (8 mi / 13 km)
Westminster Township, Ontario (11 mi / 18 km)
Culloden Easey, Ontario (16 mi / 26 km)

GEOBA.SE

St. Thomas, Ontario