I found the meaning of these words.

Rain, sunny, shower, frost, I found that these words are all related to weather changes.

Lightning showers and frost are three different weather phenomena. Lightning is mainly influenced by convective weather system, and the air moves strongly vertically, forming relatively strong convective clouds in the air, thus forming lightning. Shower is a kind of rainfall phenomenon. Generally, there will be showers when there is lightning, because the meteorological conditions that form showers are basically the same as those that form lightning. The only difference between lightning and showers is that convective clouds in thunderstorms contain a large number of supersaturated water droplets, which condense into showers. The difference between frost and thunderstorm is that when frost occurs, the temperature near the ground is generally below 0 degrees. Frost usually appears in the morning and evening when the sun is shining and the breeze is blowing. Frost is a weather phenomenon in which water droplets on near-surface objects condense into ice crystals. Frost appears on objects near the ground, lightning appears between clouds in the sky or between clouds and the ground, and showers appear in the process of falling from clouds in the sky to the ground.