How are weather symbols drawn?

The weather symbols in the picture are not standard and can be explained as follows.

The first row: the first pattern is "sunny"; The second is "cloudy", the third is "shower" and the fourth is "cloudy";

The second row: the first pattern is "cloudy/cloudy"; The second is "light rain", the third is "heavy rain" and the fourth is "rainstorm";

The third row: the first pattern is "thunderstorm"; The second is "lightning", the third is "heavy snow" and the fourth is "sleet";

The fourth row: the first pattern is "cloudy at night"; The second is "sunny at night", the third is "sandstorm" and the fourth is "fog".

There are national standards for weather symbols, and the weather symbols specified in the national standards are as follows:

Weather symbols generally follow national standards: graphic symbols for public meteorological services (GB/T 22 164-20 17? ), which stipulates the graphic representation and usage of weather symbols in public meteorological services.