One scenario to be concerned about is clear, calm nights when the temperature is forecast to be in the mid to upper 30s and the dewpoints are low. The panels surfaces may radiate enough to drop to freezing or below - essentially an inversion develops. If the wind picks up it will help this situation by breaking down the inversion and warming the panels.
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Originally Posted by biker1
None of that matters. If a surface is wet, evaporative cooling can drop the temperature. Once the water evaporates the surface will warm to the ambient temperature. Since you are talking about a liquid in pipes (and the outside of the pipes is dry), the wind does not matter. Higher wind speeds actually tend to warm things up a bit by mixing down warmer air if an inversion had developed. Use whatever temperatures you like but the physics are clear.
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