What "conditions" will give you a frost. (I have an Acurite station). This morning we have 32 F Temp and a 30 F dew point. There is no frost. But I have seen frost at 35 F here (but before I got the weather station, so I don't know what the dew point was. Curious if I could set a frost warning (to get my special plants off the porch) with my Acurite?
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Low to mid 30's is usually the threshold, along with clear skies for radiational cooling. This allows the heat to escape the ground and surface areas. We also need almost saturated air (dewpoint close to air temperature). Then little to no wind.