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it will be a read-only data if you checked on the weather station, if you want to change it you need to uncheked it from the weather TAB .
it varies depending on the city you choose.
revit has its own data, you could use other info if you want from the internet but it is up to you to choose which info you want for your design
The heating design temperature is the outdoor dry bulb temperature that is exceeded during at least 99% of the hours in a typical weather year. Depending on the required comfort level in the space under consideration, the percentage (99%) can be varied.
info from revit help
When designing an HVACR system, it is of paramount importance to use the correct outdoor climate data
(outdoor design conditions) for the locality in which the building receiving the new system is located.
This data is used when calculating the building component heating load and component cooling load,
which in turn are used to determine the required cubic feet per minute (CFM) for each room, design the
appropriate duct work, and select the optimal equipment for the application. As is evident, not using the
relevant outdoor design conditions can cause errors that will propagate throughout the system design
process. The results are an uncomfortable indoor environment, energy inefficiency, and avoidable
expenses.
info from http://www.energystar.gov
Alaaeldin Alsahli
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