Abstract
In this study, the ISD surface meteorological observation data set in NCEI database website under NOAA is used. The longitude and latitude range of the selected stations is 105°E∼117.5°E, 24°N∼32.5°N. The basic meteorological data of the winter from 2001 to 2010 are statistically analyzed. The statistical analysis shows that there is a short period of severe cooling to below 0°C and relative humidity increasing in 2008, in addition, the observed wind speed did not change significantly, the wind direction changed disorderly, and the sea level pressure at different stations showed high consistency. Based on the statistical analysis, three basic meteorological elements, temperature, relative humidity and wind speed, are selected to normalize, and then the rain snow freezing disaster index is generated according to the weight. According to the unified standard, Guizhou Province is (0.65,0.3,0.05), Hunan and Jiangxi Province is (0.55,0.4,0.05). Through the qualitative evaluation of the weight factor scheme, it can reasonably reflect the situation of rain and snow freezing disaster.
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