The geographic location of your project will determine how this will be addressed, and that is why the Reference Guide leaves room for project-specific approaches. Consider how the weather influences commuter choices in your area, and how you can modify your survey timing or strategy accordingly. For example, if you have plenty of parking capacity, occupants may switch their commuting mode per weather conditions or season. A few ideas to consider are as follows:

Conduct the survey in a "shoulder season" (fall or spring) to assess the “average” level of alternative commuting at the project building.Conduct two surveys—one in the summer and one in the winter—and average the results.Develop additional survey questions that can help quantify seasonal differences and provide clues on how to make a reasonable adjustment to your findings to account for seasonal variation.