Would root development still continue during the winter especially when the low is 53?
Root development is more than likely less than at other times, but a low of 53 F ( about 11'c ?? ) is periodic where you are ? Its not the usual day temp ??
The temp inside the wrapping around the marcott root ball may not get that low, or get back higher thru the day. Other factors like sun exposure, wind chill, rain or irrigation, may also raise or lower the temp ?? The colour of the wrapping ( black ) may also raise the temp to induce root activity.
Yes you may be better off at other times as suggested, but the winter low temp may not be a good measure of the temperature inside of a marcott, or plastic pot etc. over the entire day or month ??