Some of Greenland probably gets more precipitation
than many arctic areas, but many arctic tundras are
not well watered. One source suggested 15 to 25 cm (6
to 10 inches) precipitation per year. (See below) Even
though critics of arctic data gathering have suggested
that collecting circumstances have caused an under
reporting of precipitation (because data may be
collected on a monthly and not a daily basis), those
are actually pretty dry areas or cold deserts. The
permafrost keeps water from draining into the soil.
Cool temperatures (and locking up of precipitation in
the winter ice) must keep evaporation and
transpiration rates much lower than they would be in
warmer climates.
"They" are going to have to advertize a lot more to
get me, even in their "summer", to visit Greenland.
For the 60 day growing season, temperatures rocket all
the way up to daily averages of 3-12° C (37-54° F).
That's March and November in northern Illinois.
Oz and Sweden (as opposed to Greenland - the Green in
the name was Viking real estate propaganda) are way
higher on my list of places one would like to visit.
:)
http://www.ucmp.berkeley.edu/glossary/gloss5/biome/tundra.html
All the best!
Scott