Urban heat island (UHI) effects, intensified by global climate change and rapid urbanization, significantly elevate urban air temperatures. This phenomenon leads to substantial increases in building energy consumption, aggravated urban carbon emission, and raised public health risks under extreme heat. Facing these multifaceted challenges, there is a pressing need to develop accurate and efficient tools for predicting non-uniform urban thermal environment to support the UHI mitigation towards climate-resilient city design. High-resolution computational fluid dynamics (CFD) required large expenses for practical application, prompting the exploration of alternative approach such as machine learning. Nevertheless, these data-driven methods still encounter challenge in extensive training data requirement and limited physical interpretability. To address these gaps, this study develops a linear temperature model (LTM) to rapidly predict urban temperature distributions by linear superposition of pre-computed thermal contributions from heat sources. The prediction model is systematically validated across three representative test cases at different urban scales, i.e., an isolated building, a neighborhood, and a real street block. Results showed that by largely improving computational efficiency, the LTM maintained high prediction accuracy in terms of mean absolute error (MAE), root mean square error (RMSE), and mean relative error (MRE). Compared to CFD simulations, the LTM achieved good prediction precision at the building scale (MAE = 0.11°C, RMSE = 0.22°C, MRE = 0.28%), the neighborhood scale (MAE = 0.12°C, RMSE = 0.17°C, MRE = 0.31%), and the street block scale (MAE = 0.29°C, RMSE = 0.41°C, MRE = 0.84%). This model can provide urban planners, designers as well as policymakers with a practical tool for rapid thermal impact assessment, thereby guiding the development of UHI mitigation and climate-resilient design strategies.
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