You could have a bad or disconnected external temperature sensor. On stock vehicles, it's usually in the front bumper. You've done some bumper mods, so you would know better than I where to find it now.
Il Simo, that should, without a doubt be your ambient air sensor. mine did the same thing. it is located in your driver's side brake vent, kind of behind your fog lights. if that doesn't help look it up in the bentley manuel.
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Keep in mind that maybe you do not have an external temperature sensor, since your car did not come sctock with an OBC. I am sure that should be easy to retrofit, though. -35ºF is the default reading when the sensor is either absent or faulty.
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