Just a few weeks ago Hungary - where Inu lives - enjoyed some rather hectic weather. My aunt was telling me that they experienced in a few days span clear blue skies with ~15C/60F, and then some ridiculous amount of snow just instantaneously dropped on the country. Needless to say ice hit the blower fan, and the country ground to a partial halt. Word from my cousin is that the M0 (extremely tight high-way) had cars stuck for days.
So that's why Pinkie is jumping around in the snow.