Search your browser for "high bill in winter", and see thousands of articles come up on this topic! It is typical in almost every region and household to have a significantly higher gas or electricity bill due to cold weather.
Heat is generated by natural gas or electricity, so the colder it gets, the more energy it takes to heat the same amount of usage!
For heating, every degree above 70 increases the cost up to 4%! This could be even higher depending on the structure of your home or apartment. Your water heater is constantly heating water, day and night. The colder the outside temperature and pipes, the more energy it takes to heat the water.
While you can almost always anticipate a higher bill in the winter season, check out these articles for tips on reducing energy where you can:
10 Ways to Reduce Your Electricity Usage
10 Ways to Reduce Your Water Usage