Sahih Muslim 2904
Sahih Muslim · Book 54: The Book of Tribulations and Portents of the Last Hour · The Inhabitants Of Al-Madinah And How Far It Will Be Developed Before The Hour
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ ، حَدَّثَنَا يَعْقُوبُ، - يَعْنِي ابْنَ عَبْدِ الرَّحْمَنِ - عَنْ سُهَيْلٍ ، عَنْ أَبِيهِ ، عَنْ أَبِي هُرَيْرَةَ ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " لَيْسَتِ السَّنَةُ بِأَنْ لاَ تُمْطَرُوا وَلَكِنِ السَّنَةُ أَنْ تُمْطَرُوا وَتُمْطَرُوا وَلاَ تُنْبِتُ الأَرْضُ شَيْئًا " .
The famine would not break out because of drought, but there would be famine despite heavy rainfall as nothing would grow from the earth.