In some examples, a system includes a receiver configured to receive temperature data for a region of airspace from a data source external to the vehicle. The system also includes processing circuitry configured to determine one or more moisture values for the region of airspace based on radar returns received by a weather radar onboard the vehicle. The processing circuitry is further configured to determine a potential for icing at a location within the region of airspace based on the one or more moisture values and further based on the temperature data received from the data source. The processing circuitry is also configured to generate an output based on the determined potential for icing at the location.