Q: Car won't start after returning from winter break.

From about October 2016 to now, my car has had pretty bad battery problems. Just the usual stuff, car won't turn over roughly 2-3 times a week if I haven't used it that much. Used to be dome lights would stay on, and removed the fuse that led to the dome lights and problems mostly stopped, but it also took out the radio and it was a pain to keep taking it out and back in whenever I used the car. But, the dome lights and radio eventually stopped staying on in the car for whatever reason, but the battery problems persisted. Eventually went to a mechanic for help before winter break, but he said there was no issue with the battery or the alternator. Although confused, I said OK, and left for winter break. Upon returning about a month later, car doesn't turn over and barely has a whimper. Just barely clicks. There was some pretty major cold while I was gone, could that be it? Should I jump it once and see if it returns to normal? Or do I have a solenoid issue or something more serious?

My car has 150000 miles.
My car has an automatic transmission.