The Rebbe says:
1. In one of his talks during Passover, the Previous Rebbe (Rebbe Yosef Yitzchak Schneerson) describes the general feeling in the city of Lubavitch on the Shabbos (Sabbath) before the month of Elul, which is the Shabbos on which we bless the new upcoming month (Shabbos Mevarchim Elul).
To quote the Previous Rebbe: “In Lubavitch, during the Shabbos before the month of Elul, even though it would be a clear day with the sun shining, the air (atmosphere) had already changed and we had already began to feel the Elul aroma, and a “Teshuvah wind” (“a wind of repentance”) was already blowing”.