The differences in temperature comfort levels when we sleep go all the way to the chemical level. Metabolism, size, gender and other factors influence how comfortable we feel at certain temperatures.
Coldest Campsite?
The coldest campsite in the Southeast can most likely be found at Mount Mitchell State Park in North Carolina, about 4 hours and 30 minutes from Chattanooga. On top of the mountain, which is the highest peak east of the Mississippi, the average low temps for December and January are 20 and 17 degrees respectively. The record was set in 1985 when thermometers registered -34 degrees.
In addition to your sleeping bag itself, other gear and the clothes you wear camping can also play a big role. The science at work in keeping campers warm is the same that keeps coffee warm in an insulated mug. The sleeping bag, pad, tent or mug isn’t adding any of it’s own heat to the equation. They are all focused on reflecting heat back in, while limiting the amount of warmth that escapes. Stationary “dead” air makes a great insulator, which is why double-walled tumblers do such a good job of keeping drinks warm or cool. This dead air is also a key ingredient in sleeping bags and mats.
Sleeping By Degree
40 Degrees
Sierra Trading Post’s sleeping bag guide lists 40-degree bags as acceptable for indoor use. That means unless you plan to use your bag for warmth while watching snowy James Bond movies, you need something heavier.
30 to 15 degrees
Bags in this range are generally considered three-season sleepers. Fine for the spring through fall in normal circumstances, these bags are popular because they are lighter than colder weather bags and should be warm enough for most warm-season trips.
15 to -10 degrees
For winter camping, most guides suggest a bag rated for 15 to -10 degrees.
-10 and lower
There are few circumstances in the Southern Appalachians where you will ever need a bag like this, but if you are a sadist who seeks the coldest readings of the year then this is the bag for you.