Question: what is the ideal temperature for hatching eggs?
Answer: Within a range of 35 to 40.5°C (84.5 - 104.9°F) there is the possibility of eggs hatching. The optimum (for hens) is 37.5 °C (99.5°F), above this temperature as well as a reduced hatch there will be an increase in the number of crippled and deformed chicks. Above 40.5 °C (104.9°F) no embryos will survive.