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Perhaps the most important parameter is temperature â chicken eggs should be incubated at a temperature between 99 and 102 degrees Fahrenheit (99.5 is often considered to be ideal) and 50 to 65 percent relative humidity (60 percent is often considered the ideal).ertile chicken eggs can be stored up to 10 days (before incubating) with little loss in hatchability â as long as you keep them out of the refrigerator.
Correct temperature and humidity levels. The correct temperature in this incubator for chicken eggs - whether large breed or bantam - is 37.5ÂºC (between 99Âº and 99.5ÂºF). The correct humidity level for this incubator between days 1 and 18 is 45%. At day 18 it is raised to 65% in preparation for hatching.