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依据关中灌区１９个气象站１９６１～１９８９年４～５月平均气温、降水量、≥５ｍｍ降水日数及相对湿度用聚类分析法划分了偏湿区和偏干区。偏湿区主要包括中西部的长安、户县、周至、兴平、眉县、武功、扶风、岐山、凤翔、蓝田等１０县，其农业气候特点为降水多、湿度高、温度较低，是小麦赤霉病的常发区。乾县、礼泉、泾阳、临潼、渭南、华县、宫平、蒲城、大荔等９县为偏干区，其农业气候特点是降水少、湿度低、温度较高，是小麦赤霉病的偶发区。
Based on the average temperature, precipitation, precipitation days ≥5 mm and relative humidity of 19 weather stations in Guanzhong irrigation area from 1961 to 1989, the partial wet areas and dry areas were divided by cluster analysis. The wet partial areas mainly include the 10 counties of Chang’an, Huxian, Zhouzhi, Xingping, Meixian, Wugong, Fufeng, Qishan, Fengxiang and Lantian in the central and western regions. The agricultural climatic characteristics of this area are as follows: precipitation, high humidity and low temperature; Common wheat head blight. Dry counties, Liquan, Jingyang, Lintong, Weinan, Huaxian, Gongping, Pucheng, Dali and other nine counties as dry area, the agricultural climate is characterized by less precipitation, low humidity, high temperature, is the wheat scab Sporadic accidental area.