The temperature requirements for the growth of bitter gourd are a complex topic because bitter gourd is a temperature-sensitive plant. Although bitter melon has good adaptability, the regulation of temperature is crucial during the whole growth process.
First of all, let's take a look at the temperature requirements of bitter gourd seeds during the germination period. At this stage, temperature control is particularly important. The optimal temperature for seed germination is usually around 25 °C, which ensures that the seeds germinate quickly and neatly, laying a solid foundation for subsequent growth. If the temperature is too high or too low, it will adversely affect the normal germination of the seeds, and may even lead to a reduced germination rate or a longer germination time.
At the seedling stage of bitter gourd, the demand for temperature becomes relatively high. Daytime temperatures should be between 25 and 30, while nighttime temperatures should be between 15 and 20. Such a temperature range helps the seedlings to thrive and enhances their ability to withstand adverse environments. It is worth noting that the temperature regulation at this stage has a decisive impact on the growth rate and growth quality of seedlings. 
As bitter gourd enters the growing season, the temperature requirement gradually becomes milder. Daytime temperatures should be between 20 and 25, while nighttime temperatures should be between 10 and 15. Temperature regulation at this stage has a direct impact on the flowering and fruiting of bitter gourd. A moderate temperature is not only conducive to the flowering of bitter gourd, but also helps to increase fruit set. When it comes to flowering and fruiting, the temperature requirements become more stringent. The temperature should be around 25 during the day and around 15 at night. Such temperature conditions ensure the normal development of pollen and thus increase the fruit set. If the temperature is too high or too low, it will lead to flower and fruit dropping, which will affect the yield. 
In addition, in the summer high temperature season and winter low temperature season, we also need to take some special measures to ensure that the temperature of bitter melon growth is suitable. In summer, the ambient temperature can be lowered by shading and spraying water to prevent bitter gourd from being harmed by high temperatures; In winter, it is necessary to pay attention to heat preservation and cold protection, and maintain a suitable growth temperature by covering the film and other measures. 
In summary, the temperature requirements for the growth of bitter gourd vary with the change of growth stage, but in general, a warm and humid environment is appropriate. In the actual planting process, we need to carry out reasonable temperature control according to the local climatic conditions and the growth stage of bitter gourd to ensure the normal growth and high quality and high yield of bitter gourd. Through careful temperature management, we can not only improve the yield and quality of bitter gourd, but also enhance the stress resistance of bitter gourd, making it better adapted to various growing environments.