PowerCenter stores your elevation, temperature, and humidity for every run that you have done to determine your typical training environment. The elevation is determined by the elevation given in the activity file. Temperature and humidity are determined by finding the local temperature and humidity conditions based on your location for each run.
Each of these factors plays a role in the amount of power that you can output on race day.
If your anticipated race day conditions are different from your typical training environment, the Race Power Calculator will make an adjustment to your target to factor in how much more/less power you will output in those conditions.
If you have additional questions, contact firstname.lastname@example.org.