For the NY Metro area the average lows are around 24° for this time of year and come Tuesday the HIGH will be just that. Granted those of us who had the misfortune of having to be outside during the shift of the Polar Vortex when highs were in the teens and lows in the single digits, we'll still be feeling the chill. The cause? An Alberta Clipper passing through that is currently crossing the US border as we speak (as shown below). Just keep in mind when looking at it that the Low that's north of the Great Lakes isn't what we're keeping an eye on, it's the Low that's in Saskatchewan, or the Canadian Provence just above Eastern Montana if you're not sure which one that is.