Weather Display and Traffic Lights!

I know this is a crazy idea but would it be possible? We would like to connect a traffic light type of signaller to the weather station. The signaller ,IP67-rated, would be located outside in a prominent location and would signal :

  • GREEN when the max gust(last hour) is less than 17 m/s
  • AMBER when the max gust (last hour) reaches 18 m/s
  • RED when the max gust (last hour) reaches 19.5 m/s