The increments in future PET showed a strong spatial variability. PET will increase by 12.7%–23.9% at the end of this century. Future PET trend was detected by Mann–Kendall and Sen’s slope estimator tests. Magnitude of the future PET trend showed a very strong spatial variability. Magnitude of the PET trend ranged from 10.4 mm/10yr to 29.7 mm/10yr in 2011–2100.