Wonderful weather

Tuesday was the warmest day of the year, with a reported high of 67°F in the local paper. I felt comfortable going outside without a jacket. It then dropped 35°F to Wednesday's morning low of 32°F, with some scattered snow.

Why can't there be a sudden warmup of this magnitude?

All in all, it's been a pretty mild winter, temperature-wise. Since I only saw a bit of sun in mostly cloudy skies on February 2nd, does that mean we only get a fraction of the 6 weeks of winter?