close up photo of a cross-section of a tree, showing growth rings
November 29, 2018

Tree rings can reveal the age of wood used to make human artifacts from famous violins to the cliff ruins of Mesa Verde, and also tell us about the climate conditions that prevailed when those trees were alive. 

browse images of the front and back covers of the 2018 BAMS State of Climate report
August 12, 2019

The climate system we share is big and complex. Assessments like the State of the Climate depend on expertise from around the world and around the sciences. This year's "Meet the Author" profile features two contributors to the African section of the "Regional Climates" chapter. 

April 30, 2018

Average temperature maps can wash out days or weeks of hot and cold extremes that are important for things like energy planning and crop risk assessment. Jake Crouch explains how degree-day maps can bring back the details.  

October 23, 2017

The Climate Prediction Center's Mike Halpert dives into the 2017-2018 winter outlook, and talks about how La Niña winters today are different from La Niña winters of the past. 

September 28, 2017

The forecast of ENSO is not the only thing scientists use when making seasonal forecasts. This post looks at another predictor that often is even better to use than ENSO.