The paper is an original part of the study: the deformation of air temperature limits (urban heat islands ΔT > 0), the daily changes of air temperature in Warsaw (University of Warsaw - town, Okęcie - peripheries), the tendencies in air temperature (defined by δT/δt, t - time, ºC·h⁻¹) in Warsaw, spectrum and periods (Θ) changes of air temperature differences (ºC) between the town (Astronomical Observatory) and its peripheries (Okęcie) in Warsaw (1951-2000), the dependence of the difference (ΔT) between the town and its peripheries on index NAO in Warsaw (1951-2000).
Geographically weighted regression (GWR), was used here for spatial interpolation of two selected cases of the urban heat island measured in Wroclaw (SW Poland). The GWR algorithm was extended with spatial interpolation of the local regression residuals (GWRK). It was shown that the GWRK outperforms GWR, as well as other widely used interpolation procedures, including multiple regression models and residual kriging.