'Heat of the Day' in the Bible

I have let their widows be increased in number more than the sand of the seas: I have sent against them, against the mother and the young men, one who makes waste in the heat of the day, causing pain and fears to come on her suddenly.

For this reason the Lord has said of Jehoiakim, king of Judah, He will have no son to take his place on the seat of David: his dead body will be put out to undergo the heat of the day and the cold of the night.