Recognition and Analysis of Zahedan Weather Types

In order to recognize weather types, in this research 7 variables were studied in Zahedan synoptic station from Farvardin, 1st, 1358 to Esfand, 29th, 1382. Cluster analysis on the standardized matrix of data (stnd9088,18) and linking days on the basis of Ward method showed that, Zahedan has 6 weather types (WT) including:1. Moderate WT, 2. Cold and calm WT, 3. Warm and dry WT, 4. Hot, dry and windy WT 5- Very cold WT 6- Very cold, Low rain and foggy WT. Based on this research results, hot, dry and windy WT is the most dominant, durable, cold and calm WT is short-lived weather types of Zahedan. For every type one day was selected as the representative day. Monthly and yearly frequency of each type was estimated. It was found that the yearly frequency of types has changed since three decades ago.