〜にかけて
from … through to (a rough span)
Noun から Noun + にかけて
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にかけて marks a span of time or space with fuzzy edges: 昨日の夜から今朝にかけて、雪が降った, "it snowed from last night into this morning".
It usually pairs with から: AからBにかけて. The span is approximate: the snow didn't stop at an exact moment, it just continued somewhere in that range. That's the difference from から〜まで, which has clear start and end points.
It's common in weather forecasts, news and descriptions of regions: 九州から関東にかけて, "from Kyushu across to Kanto". It also works for the body: 首から肩にかけて痛い, "it hurts from my neck to my shoulders".
The unrelated にかけては means "when it comes to" and appears later in this deck.
Examples
昨日の夜から今朝にかけて、雪が降った。
It snowed from last night through to this morning.
九州から関東にかけて、大雨が予想されている。
Heavy rain is forecast from Kyushu across to Kanto.
年末から年始にかけて、店は休みです。
The shop is closed over the New Year period.
春から夏にかけて、この花が咲く。
This flower blooms from spring into summer.
首から肩にかけて、痛みがある。
I have pain from my neck down to my shoulders.