File name: LaNina_aug2017-apr2018_620.gif Original Resolution: 620 × 440 File Size: 1125 KB (MIME Type: image/gif) Date Published: May 11, 2018 Download file View image caption The fall emergence, winter peak, and spring decay of La Niña in the tropical Pacific. Difference from monthly average (1981-2010) surface temperature from August 2017 through April 2018. NOAA Climate.gov.