My Anemometer (Wind Direction or Wind Speed) locks up or stops rotating when it Freezes.
The wind speed or wind direction anemometer can freeze when with cold weather and ice. This will not harm the weather station.
Take a broom or similar pole and gently tap the wind gauges to unfreeze them.
You can spray the top of the unit with teflon snow and ice repellent like this:
but this is not 100% effective.
Snow and ice is considered normal maintenance.