基于加密观测的自动站资料，统计分析了杭州主城区热环境空间分布及时间演变特征,结果表明：杭州城市热岛效应在秋、冬季最强，春季次之，夏季最弱。江干、萧山、上城的大部地区为热岛强度主要高值区，年平均值达0.50 ℃以上。秋季最高值达0.75 ℃以上，其余季节高值区为0.50 ℃以上，高值区范围在冬季最大、夏季最小，热岛效应有从老城区向新城区扩展的趋势。杭州城市热岛效应还存在夜间强、白天弱的日变化特征，02:00高值中心达1.00 ℃以上，08:00降到0.50～0.75℃，14:00全市几乎均为0.00～0.25 ℃，20:00最大值为0.75 ℃以上。城区比郊区更易发生闷热天气，程度也更强，但近几年城乡热感差异有缩小趋势。
Based on the intensive observation data, the spatial distribution and temporal evolution characteristics of the thermal environment in the main urban area of Hangzhou are revealed. The results show that the effect of urban heat island is the strongest in autumn and winter, the weaker in spring, and the weakest in summer. The most parts of Jianggan, Xiaoshan and Shangcheng are the main highvalue areas of heat island intensity with the annual average more than 0.50 ℃. The peak value can achieve 0.75 ℃ and above in autumn, and over 0.50 ℃ in the other seasons. The high value zone is the largest in winter and the smallest in summer, and the urban heat island effect in Hangzhou tends to expand from the old city to the new city. The urban heat island effect in Hangzhou is strong at night and weak during the daytime with the heat island intensity more than 1.00 ℃ in the high value center at 02:00, then down to 0.50 to 0.75 ℃ at 08:00. The whole city are almost 0.00 to 0.25 ℃ at 14:00, and the maximum reaches more than 0.75 ℃ at 20:00. It is more likely to be muggy in the urban area than in the suburbs, to a greater degree, but the disparity between urban and rural areas has been narrowing in recent years.