Freezing drizzle
Bocchieri (1980) and Young (1978) found that 30% and 40% of freezing rain (usually drizzle) did not have a layer that was above freezing on the sounding.
Huffman and Norman (1988) notes for this type of freezing rain event cloud top temperatures within the low- level cloud deck should be in the 0o to -10oC range and that there should be a pronounced dry layer just above the cloud top. A typical sounding for freezing drizzle is shown.