craving more calories since cold weather

Since starting this calorie counter i lost 1 stone 4 pound..at a loss of 1 pound per week. ..iv recently gained the 4 pounds back. ...I have read that during cold weather we crave more food to keep warm...i have been set 1210 calories a day but im eating 1600-1800 since its gotten cold...im worried ill gain the stone i lost over this winter. ..I have a nursery child n work part time so find it difficult to hit the gym. ..Any 1 got any useful advice please. ..Id be greatful :)