The ideal temperature and humidity for a greenhouse can vary depending on the specific plants being grown, but in general, the ideal temperature range is between 70-80°F (21-27°C) during the day and around 60-70°F (15-21°C) at night.
The ideal humidity range is typically between 50-70%. However, some plants may require higher or lower humidity levels, so it's important to research the specific needs of the plants being grown.
It's also important to note that temperature and humidity can vary based on the time of year, geographic location, and type of greenhouse. It's recommended to monitor the conditions regularly and adjust as needed to provide the best environment for plant growth.