Stacker compiled a ranking of the coldest Septembers in Idaho since 1895 using data from the National Centers for Environmental Information . Rankings are based on the lowest average temperature in each month. For each of the coldest months listed below, we’ve included the average state temperature, state-wide highs and lows for the month, and the total precipitation. KIFI Local News 8 is committed to providing a forum for civil and constructive conversation. You can review our Community Guidelines by clicking hereIf you would like to share a story idea, please submit it here.