It will feel more like late September later this coming week across south-central Canada
A significant shot of cool air will spread across the eastern Prairies and into northwest Ontario from Tuesday to Friday this coming week as a persistent blocking pattern over northwest Canada forces a strong trough down into south-central Canada.
The map below shows the GFS model projected temperature anomalies for this coming Wednesday (15-20 F. below normal around Manitoba, which is 8 to 11 C. below normal). The greatest departures from normal with this pattern will occur during the daylight hours as clouds and some showers also help to keep the afternoon temperatures in the mid-teens Celsius. These same clouds and also the wind will prevent the temperatures from getting too chilly at night. Not a freeze situation.
On the flip side, temperatures will remain well above normal across northwest Canada over the next 6 to 10 days.
The summer of 2013 so far for selected cities across the nation....
So far, the warms and the wets have the lead.
I did a little digging into our climate database to see how selected Canadian cities are running so far this summer (since June 21st) relative to normal in terms of temperatures and percentage of normal precipitation....
The warm departures in eastern Canada were primarily a product of warmer nights due to higher humidity and more clouds this summer.
Vancouver, BC.....+1.5 C. above normal temperature with 71% of normal rainfall Kamloops, BC......+2.3 and 35% Edmonton, AB.....-0.1 and 103% Calgary, AB......+0.5 and 76% Whitehorse, Yukon.....+2.2 and 162% Yellowknife, NWT.....+1.9 and 42% Saskatoon, Sask.....+0.6 and 75% Regina, Sask.....-0.1 and 43% Winnipeg, Man......+0.4 and 112%
Thunder Bay, Ont......+1.0 and 153% Windsor, Ont......+1.2 and 265% Toronto, Ont.......+2.3 and 284% Sudbury, Ont.....+0.7 and 91% Hamilton, Ont.....+0.7 and 146% Ottawa, Ont.....+1.0 and 118% Montreal, Que.....+2.0 and 122% Quebec City, Que.....+0.1 and 144%
Saint John, NB.....+1.9 and 180% Moncton, NB......+2.1 and 145% Halifax, NS.......+2.4 and 141% Charlottetown, PEI.....+1.0 and 91% St. John's, NL.....+1.5 and 118%
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Cooler air to expand from Prairies to eastern Canada late June into early July.
Dry and hotter pattern in store for southern B.C. into next week, while the east turns cooler and more unsettled.