US outdoor advertising revenues grew 1% during the quarter ended March 2014. This is below the 4% growth the outdoor industry achieved during 2013 and reflects weak economic conditions. US Gross domestic product remained flat during the most recent quarter. US radio revenues were also flat.
I have heard from several of my clients that their outdoor revenues were impacted by severe weather (cold, snow and ice storms) which kept people inside and made advertisers conservative about spending.