Who wears a hat on the mountain and is in first grade halfway up the mountain?

It means "Wear a hat on a mountain with rain, but halfway up a mountain without rain". The full sentence is: "You don't go out when the morning glow comes, but the sunset glow travels thousands of miles. There is rain on the mountain and you wear a hat, but there is no rain halfway up the mountain." This is a weather proverb, which means that if the clouds are on the top of the mountain and cover the top of the mountain, like a hat, it will rain; if the clouds are in the middle of the mountain and the mountainside cannot be seen, it will be sunny. Refers to the positional relationship between mountains and clouds. It's going to rain, and there are clouds on the top of the mountain, like "wearing a hat"; when the clouds cross the mountainside, it won't rain.

"Weather proverbs" refer to folk words about predicting weather changes. Human beings have been trying to create accurate weather forecasts for thousands of years. Weather proverbs are proverbs summed up by working people after a history of oral narration and notes. They are used to indicate whether the weather will be clear or windy and rainy tomorrow.

Through constant observation and repeated empirical evidence, although weather proverbs are hypotheses, they can still provide some useful information. Because weather proverbs are obtained through repeated observation and practice, they cannot be called unscientific. However, it has regional limitations and may not be universally applicable. The use of weather proverbs for long-term weather prediction is also subject to subjective limitations of meteorological changes and may not necessarily be feasible.

Because scientific knowledge was not developed when most weather proverbs were produced, they lack the scientific root-seeking spirit. They only describe phenomena without explanation, so they have no theoretical support. However, weather proverbs have become credible enough for daily use.