The car will use more power while driving in cold weather due to higher rolling resistance, higher aerodynamic drag, and heater/defroster use. Therefore, it will require more energy from the wall to recharge. Higher internal resistance of the battery theoretically increases charging losses, but the resistance increase is not a lot so the net effect on charging energy is minimal. Level 2 (208 or240 volt) charging is more efficient than L1 so it is beneficial to use L2, if available.
Edited to add: You don't say where you are located and what power company you have, but I strongly doubt that the Geo Metro would be significantly less expensive to operate if all costs are accurately considered. With off-peak power rates and L2 charging, the electricity for my LEAF is less expensive than gasoline for my motorcycle. Also, a gasoline engine vehicle has more routine maintenance expense than an EV.
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015