If you grow crops, your crops can freeze when it's a clear sky at night with stagnant air even though the air temperature only goes close to freezing. In some

If you grow crops, your crops can freeze when it's a clear sky at night with stagnant air even though the air temperature only goes close to freezing. In some agri areas, you'll see "wind machines" to blow the warmer air around the crops to keep them from radiating their heat and frosting. https://www.ontario.ca/page/wind-machines-minimizing-cold-injury-horticultural-crops https://www.ontario.ca/page/wind-machines-minimizing-cold-in...