The disparities between regional and national results could reflect climate differences between states. (scientificamerican.com)
That data representation only reflects anomalies compared to 1971 to 2001 - presumably there were weather and climate differences before then. (planet3.org)
Because temperature and moisture predictably change with elevation, these gardens reflect climate differences — ranging from desert to alpine forest — that mimic the effects of climate change. (scientificamerican.com)