John Lightfoot on John 18:18

[For it was cold.] It was the very dead of night, almost at cockcrowing. Our countryman Biddulph, who was at Jerusalem at the very time when they were wont to celebrate the Passover, gives us the reason of this cold by his own experience. He acknowledgeth indeed that he found it so hot at that time as we usually feel it in our own country about midsummer, that he could not but wonder how Peter, at that time of the year, should be so cold. But within a few days his doubt was resolved, for there were mighty dews fell, which not being wholly dried up by the sun made it very cold, especially in the night, &c.

Nay, the traditional fathers suppose there may be frost and snow in the time of Passover, by that canon of theirs: "They do not intercalate the year either for snow or for frost."

The intercalation of the year respected chiefly the Paschal solemnity; namely, that by the interposing of the intercalated month all things might be ripe and fit for that feast. If when it came to the month Nisan the barley was not yet ripe enough to offer the sheaf of the first fruits, then they put a month between, which they called the second Adar. So if the ways were so bad that people could not travel up to Jerusalem, if the bridges were so broken that they could not pass the rivers, they intercalated or put a month between, that at the coming in of the month Nisan every thing might be ready that was requisite for the Paschal solemnity. But if frost or snow should happen when Nisan was entering in its ordinary course, they did not put a month between upon that account. From whence it is plain that frost and snow did sometimes happen at that time.