Environment Canada

Environment Canada

June 30, 2005 12:27 ET

Environment Canada: Ontario Weather Review

TORONTO, ONTARIO--(CCNMatthews - June 30, 2005) -

June 2005

How hot was it? It was so hot that June 2005 will go into the history books as one of the hottest Junes ever.

Record high monthly average temperatures were established over many sites in Southern and Central Ontario. Monthly temperatures were generally three to four degrees above normal. Even Northern Ontario felt the heat, with values one to two degrees above normal. Growing seasons delayed by cool weather in May were quickly brought up to speed.

One clear hot spot was Windsor, where on 16 days temperatures reached or exceeded 30C. The previous record of 15 days of 30C or better in June was set in 1949. In addition, Windsor and 18 other locations equaled or exceeded their record average temperature for June.

With the hot weather, rainfall was well below normal for most of the province. One site in Southern Ontario (Windsor) has not been this dry in June since 1952 and another, in Northern Ontario (Timmins), last had this little precipitation in 1980.

There were, however, some exceptions. Localized severe thunderstorms caused flooding in the Barrie area on June 9, where estimates of 100 to 150 millimetres of rain were reported in just a few hours. Northwestern Ontario also had its share of rainfall. Sioux Lookout reported 90 millimetres of rain on June 22, causing extensive damage. The rain was accompanied by golf ball-sized hail and high winds.

The relatively slow beginning to the summer severe weather season in May was more than made up for this past month. In addition to the significant rains experienced in Barrie and portions of Northwestern Ontario, a number of tornadoes and damaging wind events also occurred. There were five confirmed or probable tornadoes this past month; with the one confirmed tornado that occurred in May, this brings the total number of Ontario tornadoes to six so far this year.

All of these tornadoes were rated as being at the lowest end of the wind damage scale, Fujita Level 0 (estimated winds of up to 117 km/h), except for the tornado in the Hanover area (east of Walkerton) rated Fujita Level 1 (estimated winds between 118 and 180 km/h).

The six tornadoes to date occurred in the following areas:

- Rodney (southwest of London), May 13

- South of Windsor, June 5

- South end of Stratford, June 8

- East of Fergus, June 13

- Hanover (east of Walkerton), June 14

- Orrville (east of Parry Sound), June 14

Other locations in Ontario during the past month experienced tree and minor structural damage from strong wind gusts associated with severe thunderstorms that were not related to tornadoes.

In addition, on June 23, significant tree damage occurred in portions of Northwestern Ontario, near the Fort Frances, Atikokan and Dryden areas. These damaging events are still being investigated to determine whether strong wind gusts from thunderstorms or tornadoes were responsible for the damage.



Record high temperature readings:

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Location Mean Temp. Normal Difference Pvs Record (Year)
-------- ---------- ------ ---------- -----------------
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Toronto Pearson 22.5 17.8 +4.7 21.7 (1949)
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Kapuskasing 18.2 14.4 +3.8 17.8 (1955)
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Timmins 18.5 14.7 +3.8 17.8 (1976)
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London 21.7 18.0 +3.7 21.0 (1967)
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Sault Ste Marie 18.2 14.5 +3.7 16.9 (1976)
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Toronto (downtown) 22.7 19.2 +3.5 22.4 (1949)
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North Bay 19.4 15.9 +3.5 18.5 (1997)
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Wiarton 19.0 15.6 +3.4 18.3 (1949)
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Earlton 18.8 15.4 +3.4 18.6 (1955)
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Hamilton 21.4 18.0 +3.4 20.1 (1967)
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Sudbury 19.6 16.2 +3.4 19.0 (1976)
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Kingston 21.5 18.1 +3.4 20.2 (1999)
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Windsor 23.4 20.1 +3.3 22.7 (1949)
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Sarnia 21.2 18.0 +3.2 20.1 (1987)
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Chapleau 17.7 14.5 +3.2 17.5 (1995)
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Waterloo 20.5 17.3 +3.2 19.5 (1995)
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Peterborough 19.9 16.8 +3.1 18.6 (1976)
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Ottawa 21.1 18.3 +2.8 20.6 (1999)
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Geraldton 16.7 14.1 +2.6 16.7 (1995)
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Unusual low precipitation readings (in millimetres):

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Location Precip. Normal Difference Driest since
-------- ------ ------ ---------- ------------
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Windsor 22.0 89.8 -67.8 1952
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Timmins 30.8 89.4 -58.6 1980
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Hamilton 29.2 83.9 -54.7 1991
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London 33.0 86.8 -53.8 1988
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Kapuskasing 37.1 86.8 -49.7 2003
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Kingston 26.8 74.5 -47.7 1995
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Sudbury 31.0 77.8 -46.8 1991
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Geraldton 39.6 86.1 -46.5 1998
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Waterloo 35.5 81.3 -45.8 1988
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Toronto (downtown) 29.0 71.5 -42.5 1988
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Toronto Pearson 31.8 74.2 -42.4 1991
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Sarnia 44.6 85.6 -41.0 1998
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Peterborough 43.0 76.7 -33.7 1994
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Dryden 73.5 105.1 -31.6 1997
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Unusual high precipitation readings (in millimetres):

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Location Precip. Normal Difference Wettest since
-------- ------ ------ ---------- -------------
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Muskoka 135.5 85.5 +50.0 1999
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Ottawa 125.0 85.0 +40.0 2002
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Red Lake 134.6 97.7 +36.9 2000
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Kenora 144.7 107.8 +36.9 2002
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Record high precipitation readings (in millimetres):

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Location Precip. Normal Difference Pvs Record (Year)
-------- ------ ------ ---------- -----------------
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Sioux Lookout 214.6 97.3 +117.3 205.4 (2000)
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Pickle Lake 185.5 87.8 + 97.7 178.3 (1969)
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(Egalement offert en francais)



Contact Information

  • Environment Canada, Ontario Region
    Jack Saunders
    Communications Advisor/Media Relations
    (416) 739-4785
    www.ec.gc.ca