India Meteorological Department (IMD) has recently said, the Cold wave conditions will continue in Northern India till December 29, 2022.
What is a cold wave?
The IMD records a cold wave when the minimum temperature is equal to or less than 10 degree Celsius at a weather station in the plains, and is 5 degrees to 6.4 degrees below the normal temperature for that period.
A cold wave may also be recorded at a station in the plains when the minimum temperature is less than or equal to 4 degree Celsius.
For hilly regions, a cold wave is declared when the minimum temperature is less than or equal to 0 degree Celsius and the minimum temperature is 4.5 degrees to 6.4 degrees below the normal.
The ‘normal’ temperature is calculated for every five days by taking the average temperature for these days over the past 30 years.
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