Taanit 3a:13תענית ג׳ א:י״ג
§ It is taught in another baraita: With regard to dew and with regard to wind, the Sages did not obligate one to mention them by reciting: He makes the wind blow and the dew fall, in the second blessing of the Amida, but if one seeks to mention them, he may mention them. The Gemara asks: What is the reason that this recitation is optional? Rabbi Ḥanina said: Because winds and dew are consistent and not withheld, since the world could not exist without them, their mention is optional.
Mishnah Berurah 114:3משנה ברורה קי״ד:ג׳
...
Mishnah Berurah 114:13משנה ברורה קי״ד:י״ג
...
Chayyei Adam 24:4חיי אדם כ״ד:ד׳
...
Chayyei Adam 24:6חיי אדם כ״ד:ו׳
...
Ritva on Taanit 3a:1ריטב"א על תענית ג׳ א:א׳
...