One major sign of things to come is a troughing pattern expected to develop over Eastern Canada through the end of spring and into the early summer. This may bring generally below-seasonal temperatures to southern Ontario, southern Quebec, and much of the Maritimes.
The good news is that cooler-than-normal temperatures can still be rather comfortable this time of year. Toronto’s average daytime high rises from 22°C to 26°C through the month of June.
A bit of unwelcome news is that troughing patterns often lead to unsettled weather. We’ll have to watch where active storm tracks set up, which could bring the region spells of stormy weather. Periods of elevated moisture streaming up from the south may enhance rainfall over the Atlantic provinces.
Forecasters will monitor the placement of that trough heading into the season. It’s likely that warming waters in the Atlantic Ocean will help that trough retreat to the west. This would lead to a warming trend for the Atlantic provinces.
The big question will become where that trough ultimately decides to settle once this change occurs, whether it sets up shop over the Great Lakes or continues shifting even farther west.
El Niño may take a chomp out of this hurricane season
One of El Niño’s greatest effects on summertime weather in North America is its influence over the Atlantic hurricane season.
