Hens go broody when you don’t want them to… and won’t go broody when you do. 
30% 'ish is Dry incubation.
In the NR360 I can achieve that on not humid days by putting just a bit of water in one side of the reservoir. Being in Florida I don't have to add water on typically humid days.
Humidity doesn't have to be exact, like @Ridgerunner says it's about average moisture loss over the course of incubation.
"Hatching" humidity will apply during the final 3 days, called Lockdown, I always aim for 70% +
Pay extra attention to folks from climates similar to yours (so not me), because environment really matters.
In the NR360 I can achieve that on not humid days by putting just a bit of water in one side of the reservoir. Being in Florida I don't have to add water on typically humid days.
Humidity doesn't have to be exact, like @Ridgerunner says it's about average moisture loss over the course of incubation.
"Hatching" humidity will apply during the final 3 days, called Lockdown, I always aim for 70% +
Pay extra attention to folks from climates similar to yours (so not me), because environment really matters.
