Ford fiesta dashboard making strange noise

[jnsdlt]

Hello

Every time the weather gets wetter or the air is more damp/ humid, my dashboard starts making a strange buzzing noise. Because of this nothing will work on my dashboard, even my radio won’t start.

[jsk]

Could the buzzing sound be electrical arcing due to the water getting on to some electrical connections. Doesn't sound good and if it is what I have suggested it could be a devil to find up behind the dash.