National Weather Digest Climatology A STATISTICAL EVALUATION OF THE NEW YORK CITY-NORTHERN NEW JERSEY URBAN HEAT ISLAND EFFECT ON SUMMER SEASON DAILY MINIMUM TEMPERATURES

Temperatllre differences between Central Park and 22 stations in northern New Jersey and sOlltheastern New York state for slimmer season nights experiencinR favorahle radiational cooling conditions dllrin g a 16-year period are evaillated. The e.ffect of IIrbanization on temperatllre dif~ ferences is strongest in the region adjacent to Central Park and diminishes with increasing distance./i"om the lIrban area. Also. the modifying efTect of river valleys on temper-atllre is evident along both the HlIdsoll and Delaware river valleys where mean minimllm temperatllres are warmer than adjacent stations. 1