Rashi on Leviticus 26:4/רש"י על ויקרא כ״ו:ד׳

1בעתם [THEN I WILL GIVE YOU RAIN] IN ITS SEASON — i. e. at times when the rain is “seasonable”, at such moments when people do not usually go out on journeys, as, for instance, in the nights preceding the Sabbaths (Friday nights) (Sifra, Bechukotai, Chapter 1 1; cf. Taanit 23a).

2ועץ השדה AND THE TREES OF THE FIELD [SHALL YIELD THEIR FRUIT] — This refers to the wild trees; and even these will bear fruits in future (Sifra, Bechukotai, Chapter 1 6).