A car digital thermometer is not only helpful for knowing the temperature outside, but actually can be a safety feature when the temperature has dropped and there is a chance of ice. There are a variety of car digital thermometer models available today. Some are basic and simply give the outside temperature, while others have additional features and will offer the minimum and maximum temperature, a compass, clock, alarm clock, ice alert, or backlight. It really depends on what features you would like. Just keep in mind it is easier to buy the car digital thermometer with the features you want the first time instead of replacing one after you’ve bought one. Sometimes there really isn’t that much difference in price, so get the one you want.