Winter 2024 2024. Winter 2024 starts on saturday, december 21st in the northern hemisphere, with the first day of winter being the shortest daylight day of the year with the earth's axis. A weaker polar vortex usually means a weaker jet stream,.

We’re expecting a la niña uk winter 2024/25, going by the latest enso forecast from noaa, a la niña phase is more than likely to occur this winter. A weaker polar vortex usually means a weaker jet stream,.