Weather has two important characteristics: weather reflects the atmospheric conditions in a place (changeable); Meanwhile, the weather in different places may be different.

Weather refers to the specific state of the atmosphere near the surface of a place in a short time. We can describe the weather in this way: sunny, rainy, high temperature, low temperature, strong wind, breeze ... The outstanding feature of weather phenomena is changeable. So at the same time, the weather in different places may be very different.

Therefore, the answer is: short time; It's big.