Forecasting minimum temperatures for an airport and a nearby urban site

For Zestienhoven Airport as well as for the nearby Rotterdam urban area regression equations have been derived as a tool for forecasting nocturnal minimum temperatures. Input to the equations are the sum of temperature and dewpoint, observed at 1500 GMT and an estimate of cloud cover and some wind parameters for 0300 GMT the following night. The performance of the equations on independent material is discussed. A few sections are devoted to nocturnal urban-rural temperature differences and their relation to various meteorological variables.