est ▁ 1 9 5 6 ▁with ▁only ▁. ▁The ▁wet test ▁single ▁month ▁has ▁been ▁August ▁ 1 9 9 8 ▁with ▁ 2 0 . 9 3 ▁inches , ▁of ▁which ▁a ▁record ▁ ▁fell ▁on ▁August ▁ 2 3 ▁associated ▁with ▁the ▁rem n ants ▁of ▁Trop ical ▁Storm ▁Char ley ▁and ▁brought ▁w ides p read ▁flo oding ▁through ▁the ▁city . ▁This ▁almost ▁double d ▁the ▁previous ▁record ▁daily ▁ra inf all ▁of ▁ ▁on ▁June ▁ 1 3 , ▁ 1 9 3 5 . ▁The ▁most ▁days ▁during ▁a ▁month ▁with ▁at ▁least ▁ ▁of ▁ra inf all ▁has ▁been ▁ 1 9 ▁in ▁May ▁ 2 0 1 5 . ▁Typ ically , ▁ 4 1 ▁days ▁receive ▁at ▁least ▁ ▁of ▁ra inf all , ▁ 1 3 ▁days ▁with ▁at ▁least ▁, ▁and ▁five ▁with ▁ra inf all ▁total ing ▁at ▁least ▁. ▁During ▁the ▁winter ▁from ▁November ▁to ▁March , ▁long ▁periods ▁normally ▁pass ▁with ▁neg lig ible ▁ra inf all : ▁between ▁October ▁ 1 9 1 7 ▁and ▁March ▁ 1 9 1 8 , ▁only ▁ ▁of ▁rain ▁fell ▁in ▁ 6 ▁months ▁and ▁not ▁one ▁single ▁day ▁recorded ▁as ▁much ▁as ▁. ▁ ▁Del ▁Rio ▁is ▁home ▁to ▁a ▁rad ios onde ▁launch ing ▁site ▁at ▁Del ▁Rio ▁International ▁Airport , ▁where ▁twice - d aily ▁weather ▁bal lo ons ▁are ▁launched ▁to ▁take ▁atmos pher ic ▁read ings ▁- ▁once ▁at ▁ 1 2 0 0 ▁UTC