The wetness index (W) was calculated using gridded monthly precipitation and potential evapotranspiration (PET) in the Beijing-Tianjin-Hebei region of China. Meteorological data from 1991 to 2020 were provided by the Climate Research Unit. The change in W and the factors influencing it were analyzed at regional and urban levels. The results show that (1) W of the Beijing-Tianjin-Hebei region fluctuated greatly year by year. W decreased (p < 0.05) during the years from 1991 to 2000, rose slightly (p < 0.05) from 2001 to 2010, and experienced almost no change in the last decade. (2) In the last two decades, W in some areas of the Beijing-Tianjin-Hebei region increased, probably owing to the increase in precipitation in this area. (3) In the context of climate warming, W values in the Beijing-Tianjin-Hebei region and major cities are affected by precipitation, while temperature has little impact on the values.
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