Hello,
The datasheet for arduino nano specifies that it works in range of temperature -40C to 85C. But there is no data about humidity level. Does anyone have reference/data for this?
Thank you
The only time high humidity will damage electronics is when it condenses to a liquid. That applies to the metal components as well.
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Safe operation area is non-condensing humidity.
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There are many known ways to protect electronics against moisture. Tape at the Google "electronic moisture protection"
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Your problem will be if high relative humidity and the uC is turned off for periods where it’s temperature falls below the condensation point. In general, if on, electronics will generate some additional heat and therefore protect themselves somewhat. Once you have a finished product then you can consider some moisture protection such as a case or coating all exposed parts in eg nail varnish or conformal coatings. You can even “pot” the whole thing in an epoxy resin/potting compound. Be aware of heat sink requirements. I make bits for boats so I have additional problems of the moisture often containing salts! 
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Thank you everyone for your inputs.
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