The following is the picture for Climate Change in Canada this past winter – December 2009 through February 2010. Note the great swaths of the the North in Canada that are seeing temperatures well above normal – as much as 7.5 degrees Celsius. Now context is everything because what is not shown is the temperatures in the US over the same period where they have been cooler than normal as the JetStream has dipped much lower than before allowing relatively cool Arctic air to slip ever farther South. Here is the map of the USA for February 2010 from the US Weather Service:
So the context shows two things. First, the extreme variability of the weather in North America with large portions of Canada and the US subject +8 degrees F and also -8 degrees F in temperature [but primarily in the US]. Second, that examining weather numbers and trends with reference to a)the big picture and b)the underlying weather models and patterns for an area and how they are changing is critical to understanding long term trends in the weather.