Since Jan. 1, we've only had two days where the temperature reached above freezing and it's regularly been in the single digits and teens. Cold weather reduces a battery's effectiveness and a dead battery could endanger your life if you're stranded in freezing weather.
This article at Fifthgear sums it up well. Cold weather reduces a battery's ability to hold a charge and to accept recharging (really hot weather is just as bad but we'll get into that later). Modern cars especially have lots of electronics that suck battery power as well.
Stop by Plantation Tune Tech any time and we will check your battery's condition for free. You can trust us not to try and sell you a product you don't need. If your battery is fine, we'll send you on your way. If your battery is old, damaged or at risk of failing, we can also help with a replacement and we can installed weather-resistant types as well.