What are cP air masses?

<p style=";text-align:left;direction:ltr">Arab Weather - The cP (Continental Polar) air mass is a continental polar air mass that forms over cold continental regions, such as Siberia or northern Canada. These masses are characterized by being cold and dry, with very low temperatures and low humidity.</p><p style=";text-align:left;direction:ltr"> cP air masses usually affect the winter, bringing cold, dry conditions to the areas they pass through, such as the interiors of continents.</p>