Sooperhonk
Active Member
Had an extreme all grain brew session in Hendersonville NC a few days ago in my unheated barn brewery. It was 3 degrees outside. Not sure what the RH was, but the air was abnormally dry. I planned on a 6.5 gallon batch, so used 6.5 gallons of sparge water. After a 90 minute boil, I only had around 4 gallons left in the kettle. I figure this is due to the extreme low RH outside and higher evaporation rate but have no idea how to account for this in future brews. I've seen a couple boil calculators out there but don't see an input for humidity. Anybody know how to adjust boil volumes for low humidity/high evap brew days?
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