Vegetation has become one of the most important strategies for mitigating heat stress in cities worldwide. However, current urban greening design schemes are more oriented toward reducing dry heat (primarily air temperature), while paying less attention to moist heat, which reflects the combined effects of air temperature and humidity on human thermal comfort. Here, we conducted a meta-analysis of summer microclimate data from 23 Chinese cities to evaluate the effects of 7 urban green space types (combinations of trees, shrubs, and grasses) on both dry and moist heat across 5 climate zones: humid subtropical, humid continental, semi-arid, continental cold semi-arid, and continental desert. Our findings reveal that shading vegetation (tree-dominated) reduces both dry heat and moist heat (wet-bulb temperature, TW), while non-shading vegetation (shrub- and grassdominated) cools the air but often increases TW, especially in arid climates. For example, in continental desert climates, shrub- and grass-dominated green spaces reduced air temperature by -2.21 +/- 2.1 degrees C, and -0.59 +/- 1.2 degrees C, respectively, but increased TW by +1.21 +/- 1.3 degrees C and +1.34 +/- 0.8 degrees C due to increased humidification. In humid subtropical climates, these green spaces also lowered air temperature, but weaker humidification led to a decrease in TW. For different vegetation types, their moist heat effects were primarily influenced by background climate. In tree-dominated green spaces, tree height and canopy area played a crucial role, together contributing 33.72% to the reduction in TW. This explains why tree-dominated spaces are more effective in alleviating moist heat. Our results highlight the need to incorporate moist heat considerations into urban greening strategies to optimize environmental comfort across diverse climates.