Air temperature variation due to climate change during the past several decades has been linked to changes in river flow. In this study, the wavelet analysis technique was used to identify temporal patterns of air temperat and how it affects forest stream flows in the Lower Mississippi River Alluvial Valley. Using 60 to 90 years of measurement data we found that the climate in this region gets warmer as time elapsed. The streams were drier due to warmer air temperature. Most importantly, we discovered that the best way to estimate the temporal patterns of air temperature and stream flow was to perform the wavelet transformation around their mean values.