Journal
CLIMATE
Volume 6, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/cli6010015
Keywords
surface air temperature; winter; climate change; interannual variability; hardiness
Categories
Funding
- National Oceanic and Atmospheric Administration (NOAA) [NA16SEC4810008, NA15OAR4310080]
- United States Agency for International Development (USAID) under the U.S.-Pakistan Centers for Advanced Studies in Water
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Work published in 2012 revealed that annual minimum temperatures over the coterminous United States (USA) have increased faster than mean temperatures, causing a pronounced poleward shift in the positions of hardiness zones defined by the expected annual minimum temperature. Here, estimates of increases in annual minimum temperatures are updated and extended to other land areas where station temperature records are available. Annual minimum temperatures have increased faster than mean temperatures in seasonally cold regions globally, but have warmed at about the same rate as mean temperatures in tropical climates. The mean increase in annual minimum temperature across the available weather stations was 2.0 degrees C between 1970 and 2016 (or almost 0.5 degrees C per decade), as compared to an increase of 1.2 degrees C in mean temperature. Recent cold winters in regions such as Eastern North America did not clearly break with this trend and were within the range of variability seen in past decades. Overall, annual minimum temperatures appear to be increasing steadily, though with considerable inter-annual variability.
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