Not really. You can talk to 5 different people and get 5 different answers as to what perecentage is best. Most everyone agrees that anything over 55% the first 17 days is to high. Generally, I think, the majority who practice a standard incubation process usually shoot for 40-55% and those who dry incubate generally try to keep above 20/25% and under 50%. I preach the key isn't the percentage of humidity but the growth of air cells. That's what humidity control is all about. Making sure the eggs loose enough moisture. So if you monitor the air cell and make changes based on that you are doing more justice to your eggs than sticking blindly with a number. Now, at hatch, I believe the higher the better.So there's no *magic* number for humidity?