This document discusses how the city of Chicago is utilizing MongoDB for its smarter city initiative called WindyGrid. WindyGrid integrates data from over a dozen sources and visualizes it on a map to provide situational awareness. Location is a common element across city data and provides opportunities for research. The University of Chicago has deployed sensors across the city as part of the Array of Things project, which frequently posts hyper-local data on sound, temperature, and more to WindyGrid. This open data is accessed through MongoDB and contributes to making Chicago a smarter city.