Farmers around the Gunnedah district will receive a personal surprise in their mailboxes.
Australia Post's rural mail department is delivering the letters written by students from Lane Cove West Public School students who have been learning about water cycles and climate events.
Lane Cove is Gunnedah shire's sister city and ex-Gunnedah woman Bronwyn Zbik (nee Deane) works at the school where students have been learning about water cycles and climate events.
"We hope farmers will take them in good spirit and hopefully they do reply to the kids," Rotary president Mark Kesby said.
"Lane Cove kids are trying to understand what [the drought] is about."
Gunnedah and Lane Cove became sister cities in 1990s when the shire was in drought.