01864nas a2200193   4500008004100000245012800041210006900169260001200238520119500250653002401445653001801469653002501487100001801512700001801530700002101548700001401569700001801583856006901601       2020                        eng d00aClimate from the McMurdo Dry Valleys, Antarctica, 1986 – 2017: Surface air temperature trends and redefined summer season0 aClimate from the McMurdo Dry Valleys Antarctica 1986 2017 Surfac  c05/20203 a<p>The weather of the McMurdo Dry Valleys, Antarctica, the largest ice‐free region of the Antarctica, has been continuously monitored since 1985 with currently 14 operational meteorological stations distributed throughout the valleys. Because climate is based on a 30‐year record of weather, this is the first study to truly define the contemporary climate of the McMurdo Dry Valleys. Mean air temperature and solar radiation based on all stations were ‐20&deg;C and 102 W m<sup>‐2</sup>, respectively. Depending on the site location, the mean annual air temperatures on the valleys floors ranged between ‐15&deg;C and ‐30&deg;C, and mean annual solar radiation varied between 72 W m<sup>‐2</sup> and 122 W m<sup>‐2</sup>. Surface air temperature decreased by 0.7&deg;C per decade from 1986 to 2006 at Lake Hoare station (longest continuous record), after which the record is highly variable with no trend. All stations with sufficiently long records showed similar trend shifts in 2005 &plusmn;1 year. Summer is defined as November through February, using a physically based process: up‐valley warming from the coast associated with a change in atmospheric stability.</p>10aMcMurdo Dry Valleys10asummer season10aweather observations1 aObryk, M., K.1 aDoran, P., T.1 aFountain, A., G.1 aMyers, M.1 aMcKay, C., P.  uhttps://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019JD032180