Study of frost tempo_spatial probability distribution in Zanjan province

Humans and plants can grow in a certain temperature range and shall bear their ability against the high and low temperatures are limited. Decrease temperature of minimum thresholds of plants and occurrence of frost damage on roads every year the vast country's economy will enter. Study the tempo-spatial distribution of frost occurrence is the most fundamental climate research, which can planners to reduce cold and frost damage to guide and assist (Kamali, 151:2002).Many studies in Iran and the world about this phenomenon have been done. The most important studies in other countries can be Suckling Studies (1988), in the southeastern United States, Watkins (1991) in the UK, Eriksson and Lindquist (2002) noted in Sweden.