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I have a mix of winter annual weed preventer mixed with fertilizer that is best applied to wet grass. I have to apply it soon because it works best with air temps above 60. It also should not be applied when rain is forthcoming. For me that leaves today out. So, I’m looking to apply it tomorrow or Thursday morning to take advantage af a day or two of relative warmth. My question is... How can I know if there will be dew, and if so, how much?
 

Thanks!!

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18 hours ago, PRINCETON ANGLER said:

I have a mix of winter annual weed preventer mixed with fertilizer that is best applied to wet grass. I have to apply it soon because it works best with air temps above 60. It also should not be applied when rain is forthcoming. For me that leaves today out. So, I’m looking to apply it tomorrow or Thursday morning to take advantage af a day or two of relative warmth. My question is... How can I know if there will be dew, and if so, how much?
 

Thanks!!

Dew forms when your low temps are very close to your dew point, hence the name dew point, point at which dew forms.

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1 hour ago, PRINCETON ANGLER said:

That’s what I figured. So the closer the temp is to the dew point, the heavier the dew, or are P W values a factor?

It doesn't matter that much.  Just need the spread between temperature and dew point to be minimal, like this morning.  The longer you spend near the dew point overnight, the heavier the dew.  You will see temperatures and dew points fall in tandem on clear and very calm nights in the fall as you lose moisture to the atmosphere.

 

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