| COLDFRONT | Harbinger of lower temperatures, and a hint to the answers to starred clues |
| COLDFRONTS | Harbingers of lower temperatures, and a hint to the answers to the starred clues |
| SUNSPOTS | Regions of lower temperature, and therefore lower brilliance, on the surface of the Sun (8) |
| SCARLETFEVER | Illness characterised by high temperature and a bright red rash (7,5) |
| SWATHE | She's wrapped up with a temperature and a bandage (6) |
| SNOWDROP | Woodland, parkland and garden flower, often the first sign of life after the winter and thus a harbinger of spring (8) |
| GREATTIT | Green, yellow and black garden bird whose call is often considered a harbinger of spring and is the largest of the six species within its family (5,3) |
| CRYOGENICS | The study of very low temperatures and their effects |
| HERALD | Medieval messenger or officer of arms; an authority on armorial bearings; or, something such as the call of a cuckoo, considered a harbinger of spring, for example (6) |
| MELT | To thaw edges of mistletoe, start to lower temperature |
| SUNSPOT | Dark region of cooler temperatures and high magnetic fields that appears on our solar system's prima |
| CLIMATE | ___ change refers to long-term shifts in temperatures and weather patterns |
| IDEALGAS | A hypothetical substance which obeys Boyle's law exactly at all temperatures and pressures (5,3) |
| OWL | Bird that's a harbinger of death in "Killers of the Flower Moon" |
| COOL | How to look smart in lower temperatures? (4) |
| ASTROLOGER | A street sweeper ultimately with job taking in old, great river is predictably a harbinger of things to come (10) |
| DIPTYCH | Lower temperature necessary in the end above church altarpiece (7) |
| OPTIC | Subject to lower temperature, one might dispense brandy (5) |
| MAYFLOWER | A fly mashed in grass cutter: a harbinger of summer? (9) |
| BLACKCAT | Grimly humorous act somehow appearing to be a harbinger of good fortune? (5,3) |
