January forecast (4)
'january forecast' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sleet that I've seen before include "Mixed rain and melting snow" , "Rain mixed with snow or hail" , "Mixture of rain and snow" , "Partially frozen rain" , "Snowy rain" .)
(Other definitions for snow that I've seen before include "Jon - - (Ch.4 News)" , "Spring flower" , "Flakes that drift" , "Wintery precipitation" , "feature of 27 [THE BIG FREEZE]" .)