What is the coldest color of cold air?

There are four cold colors, namely blue, yellow, orange and red.

1, cold wave blue warning signal

Standard: within 48 hours, the minimum temperature drops by more than 8℃, the minimum temperature is less than or equal to 4℃, and the average wind power on land reaches above 5. Or it has dropped by more than 8℃, the lowest temperature is less than or equal to 4℃, and the average wind power reaches more than 5, which may continue.

2, cold wave yellow warning signal

Standard: within 24 hours, the minimum temperature drops 10℃ or above, the minimum temperature is less than or equal to 4℃, and the average wind power on land can reach 6 or above. Or it has dropped above 10℃, the lowest temperature is less than or equal to 4℃, and the average wind force is above 6, and it may continue.

3, cold wave orange warning signal

Standard: within 24 hours, the minimum temperature drops 12℃ or above, the minimum temperature is less than or equal to 0℃, and the average wind power on land can reach above 6. Or it has dropped above 12℃, the lowest temperature is less than or equal to 0℃, and the average wind force is above 6, and it may continue.

4, cold wave red warning signal

Standard: within 24 hours, the minimum temperature drops 16℃ or above, the minimum temperature is less than or equal to 0℃, and the average wind power on land can reach 6 or above. Or it has dropped above 16℃, the lowest temperature is less than or equal to 0℃, and the average wind force is above 6, and it may continue.