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:

https://www.amazon.com/DuPont-Teflon-Snow-Repellant-10-Ounce/dp/B0031T82NO

but this is not 100% effective.

Snow and ice is considered normal maintenance.

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