The standard outdoor temperature is a key value used in heating load calculations. It represents the lowest two-day average temperature that has been reached or fallen below ten times over a 20-year period.
How is the standard outdoor temperature determined?
The data used to determine the standard outdoor temperature is based on long-term climate records. These records are collected and analyzed by meteorological agencies and climate databases.
Specifically, it reflects the lowest temperature during a cold period that has occurred at least ten times over two consecutive days within a minimum of 20 years.