A computer server receives sensor data via a cellular wireless network from each of a plurality of automobiles in a geographical area. In each automobile of the plurality of automobiles the sensor data is received from sensors located in the respective automobile. The sensor data of the respective automobile may include a time stamp of the sensor data and at least one parameter of an external environment of the respective automobile. The computer server may further determine an external environmental parameter of the geographical area based on the sensor data received from the plurality of automobiles in the geographical area via the cellular wireless network. The external environmental parameter relates to the external environment of the plurality of automobiles in the geographical area. The computer server may transmit the external environmental parameter to multiple automobiles of the plurality of automobiles.