にかけて means "over", "through", "from… into…": something happens across a span of time or an area, without sharp edges. It follows a noun, usually with the start marked by , and it is the stock phrase of weather forecasts and news.
、。
Temperatures will fall from the evening into the night.
、。
The rain will probably continue through next week and the week after.
、。
Heavy snow fell across the region from Kanto to Tohoku.
、。
I have pain from my lower back down into my legs.
にかけて or まで
きごう〜 gives exact limits: it starts here and stops there. にかけて says roughly that period or area, and spreading across it. A timetable with fixed hours takes まで.
。
I work from nine to five.
、。
It snowed all through last night and into this morning.
- × 九時から五時にかけて働きます → 九時から五時まで働きます
Without から
On its own, Xにかけて points to the period leading up to X and into it.
、。
Work gets busy towards the end of the year.
、。
The weather will probably turn over the weekend.
, "when it comes to", is a separate grammar point.
Lingaku