The future is like rain, which means clear.

If this sentence is taken literally, the future will be like rain.

Qingming (clear and transparent). It may be like expressing hope that the future will be as transparent and clear as Qingming, and both rain and Qingming are transparent and clear.

But this sentence is logically incorrect, without poetry and connotation, just scrawled.

Qingming mainly refers to solar terms, which is one of the 24 solar terms in the summer calendar. After the vernal equinox, before Grain Rain.

Everything grows clean and bright, so it is called Qingming.