Climate will clearly play a key role in the performance of any building so it is important to use the appropriate location settings for any analysis. For Apache dynamic simulations in IES VE a simulation weather file is required. These files contain data for variables including dry bulb & wet bulb temperature, wind speed & direction, solar altitude & azimuth, cloud cover etc for each hour of the year.
The standard simulation weather files are sourced from various places and converted into the standard FWT file format. Usually the fwt will have an abbreviation that points out where the data was acquired (e.g: EWY = Example Weather Year. These are individual weather years sourced from the MET office). Most files are sourced directly from the energy plus website. You can read about different weather sources here. The weather file formats the VE can read are .fwt (proprietary format) and .epw files.
When you install the Standard Data & Weather Files as part of the IES VE installation the basic set of simulation weather files is included for the following locations. Additional weather files can be acquired from a multitude of sources (see below) for use in Apache simulations, these will usually be in the format *.fwt or *.epw.
To access these in VE they should be copied into the weather subfolder of the Standard Data & Weather Files installation (typically C:\Program Files (x86)\IES\Shared Content). After this the new files are available to select on the Simulation Weather Data tab of ApLocate.