Answer: coldsnaps

AnswerCrossword Clue
COLDSNAPS

Frigid periods

COLDSNAPS

High-heating-cost periods

COLDSNAPS

Fall falls, perhaps

COLDSNAPS
Fall events
COLDSNAPS
They have a chilling effect
COLDSNAPSHeat waves' opposites
COLDSNAPSHigh heating-cost periods
COLDSNAPSWinter phenomena
COLDSNAPSFrigidaire-Nabisco joint venture?