无天气 meaning in English

cloud nine

Classification of environmental conditions - classification of groups of environmental parameters and their severities - stationary use at non - weatherprotected locations
环境条件分类.第3部分:环境参数组及其严酷度等级.第4节:在无天气防护场所固定使用的产品
Classification of environmental conditions - part 3 : classification of groups of environmental parameters and their severities - section 4 : stationary use at non - weatherprotected locations
环境条件分类.第3部分:环境参数组分类及其严酷程度分级.第4节:在无天气防护位置固定使用的产品
Classification of environmental conditions - part 3 : classification of groups of environmental parameters and their severities - section 4 : stationary use at non - weatherprotected locations ; amendment 1
环境条件分类.第3部分:环境参数组分类及其严酷程度分级.第4节:在无天气防护位置固定使用的产品.修改件1