Indoor-Outdoor Thermometer - any good?

I have a wireless weather station that works great for inside and outside. However, it's not anything I'd like to use while driving. I was looking for ideas on this site and came across this thread. Does anyone have any suggestions for an outdoor thermometer that can be used while driving? We drive a 2011 31' Sunseeker and want to see the temperature rise as we drive from Maine to Florida this winter!

Thanks,

Dave in Maine