A mild cold wave is sweeping across the northern districts of Naogaon, Panchagarh, Jessore and Chuadanga, the Bangladesh Meteorological Department (BMD) has said.
The lowest temperature in the country in the 24 hours to 6am on Friday was recorded at 8.7 degrees Celsius in Tetulia, while the highest temperature was 29 degrees Celsius in Cox's Bazar.
When the temperature drops below 10 degrees Celsius or less and continues for some period, it is considered a cold wave, according to the BMD.
Different parts of Bangladesh experience different intensities of cold waves. Temperature between 8 and 10 degrees Celsius is considered a mild cold wave, 6 to 8 degrees Celsius a moderate cold wave and less than 6 degrees Celsius a severe cold wave.
The BMD said moderate to thick fog may occur at places across the country from midnight till morning.
"The weather may remain dry with temporary partly cloudy skies. Night and day temperatures may remain nearly unchanged," it added.
