National - We are already well past the spring equinox, which happened on March 20, 2008. Since then, we had past the equinox for 12 days, yet most of the country continues to experience winter like conditions. Good news is on the way, however.
According to our long term models (the temperature models for the next 7 days), we see temperatures above 0 C for majority of the populated regions of Canada, with the brief exceptions of Yellowknife, parts of Eastern Quebec, and Newfoundland. We are seeing a warm surge of temperature that will bounce up most of the country's temperature to above zero.
In the model, we are currently seeing only two more persistent cold air mass. The biggest airmass centres around Resolute, Nunavut; while the smaller one centres around just north of Newfoundland. The bigger airmass is constantly, more or less, moving, and has a centre temperature of about -20C. The smaller one is relatively stable, and has a centre temperature of about -10 C.
The first cold air mass keeps Northwest Territories and Nunavut way below the 0 C mark. The warmest part of Nunavut will only see up to -10 C in the next 7 days. The smaller air mass keeps Newfoundland, Labrador, and extreme Eastern Quebec below 0 C, keeping the temperature at around -5 C in the next 7 days. Occasionally, these cold air mass, during the next 7 days, move slightly towards the south, affecting parts of northeastern Saskatchewan, the entire Manitoba, northwestern Ontario, and parts of Northern Prince Edward Island, New Brunswick, and Nova Scotia. These areas during various time of the week, will have temperatures dipping down close to 0 C or slightly below 0 C (around -2 C). At other times, temperatures will stay above 0 C. The rest of the nation will stay above 0 C.