1. A method comprising: at a server in communication with one or more wireless access point devices, obtaining information of a location for each of a plurality of wireless client devices over a period of time based on a plurality of measurement data associated with signals received at the one or more wireless access point devices from respective ones of the plurality of wireless client devices located in one or more zones; determining at the server a historical client count time series within each of the zones based on the location for each of the client devices over the period of time and map information of the one or more zones, wherein determining the historical client count time series includes down-sampling the p th percentile of client counts in each zone over a plurality of time intervals; predicting at the server client counts in at least one of the zones over a specified window of time in the future by selecting one or more predictive methods from a plurality of stored predictive methods and generating predicted client counts in at least one of the zones for the specified window of time using the selected one or more predictive methods and the historical client count time series; and reporting predicted client counts in at least one of the zones.