Just one year ago, scientists at the U.S. Department of Energy's (DOE) Brookhaven National Laboratory assembled a unique mobile observatory for surveying the climate in urban environments. The completely off-the-grid platform maintained by Brookhaven's Center for Multiscale Applied Sensing (CMAS) employs a suite of instruments to measure atmospheric conditions at fixed locations in individual neighborhoods or while moving across entire cities. Now, researchers have taken the mobile observatory on a 1,700-mile journey from Upton, NY, to Houston, TX, where they measured air temperature and relative humidity using a new observational technique. Their work could help improve climate prediction models and address infrastructure and energy needs across the nation.