Regional wet-bulb temperature means omit the spatial distribution of humid heat. We compare upper-quartile and middle-half days of the monthly regional mean at 121 sites in a specified eastern-China domain. A prespecified multiscale architecture combines Gaussian-weighted semivariances at five bandwidths with equal-month, equal-scale and equal-summer aggregation. The specification was developed on the 2015 and 2022 summers and applied unchanged to 33 other summers in 1991-2025. On high-mean days, the weighted mean squared pairwise WBT contrast was 7.28% lower. This corresponds to a 3.71% reduction after square-root transformation and a 3.97% mean reduction in record-level root-mean-square pairwise differences. Contraction strengthened as the Gaussian graph bandwidth increased, from 2.86% at h = 126 km to 13.27% at h = 2,013 km. Exact Laplacian decompositions localised the broad-scale contrast to daily anomalies opposing the monthly north-south climatological pattern, while anomaly energy changed little. The pattern persisted in 1950-1990. A sparse external station comparison showed concordant broad-scale direction. High regional humid heat was associated with a flatter broad geographic field, a feature that a regional mean cannot identify.
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