I would like to dehydrate fruits with an outdoor air drying rack in an arid climate:

air drying rack

What ambient air temperature is ideal for this? I've heard anything below 118°F is good for dehydrating. Is 100°F better or worse than, say, 80°F?

  • 1
    The ambient humidity will make a huge difference. In fact you almost need a desert for this to work
    – Chris H
    Mar 13, 2018 at 16:19
  • @ChrisH I'm assuming 0% humidity.
    – Geremia
    Mar 13, 2018 at 16:50
  • 2
    @Geremia I doubt you will find that, unless you are living in the middle of a desert, in a nonclimatized building. Optimal humidity for human beings is 40 to 60% relative (although many live in a wider range), but I am pretty sure that the absolute also matters for dehydrating, and so the physics get quite complicated.
    – rumtscho
    Mar 13, 2018 at 17:14
  • @rumtscho Well, even in deserts in the U.S., the humidity rarely gets lower than ~10%.
    – Geremia
    Mar 13, 2018 at 17:15
  • 1
    If you know that humidity rarely gets lower than 10%, why are you assuming 0% humidity?
    – Catija
    Mar 13, 2018 at 19:11


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