Abstract: Based on frost data(the lowest ground temperature ≤0℃) of four meteorological stations in Wuwei city from 1960 to 2009,the climate characteristics,including temporal and spatial distribution,intensity,and sustainability were analyzed.The result showed that frost mainly occurred in the north mountainous area and edge of the desert.Annual and decadal frost days decreased.Frost mainly occurred in early and mid of May and the later of September.Frost days decreased gradually along with the frost intensity's enhancement.Frost more than 2 days occupied 56.4%~65.1%.By using ECMWF numerical forecast grid field of May and September from 2003 to 2007,the lowest ground temperature forecast equation was established with optimal subset regression.The prognostic equations was significant(α=0.01),its back substitution fitting rate was 56.7%~66.7%;forecast accuracy rate was 51.8%~60.0%,which had achieved certain forecast level.

Key words: Frost, Frost, Climate characteristic, ECMWF, Numerical forecast