When flying in colder-than-standard temperatures, it's important to understand that True Altitude may be lower than Indicated altitude due to the effects of cold temperatures. This is especially important when making an instrument approach at a high-terrain airport during cold temperature conditions.You can determine the approximate amount of correction by using this chart:Here is a list of cold temperature restricted airports.Here is a great AOPA powerpoint presentation.As our way to help you celebrate the New Year, we’re offering the first book in the Hamfist series FREE!You can download the book in the e-book format of your choice at your favorite retailer or Amazon, Smashwords