Like other Polar regions, Tierra del Fuego area is pretty unpredictable. Weather can shift quickly. February/March is end of the "Summer" season down there, sort of their Autumn/Fall. Mostly OK but sometimes WET, in my limited experience. (never lived there .. but spent weeks there)
Was there several times '76 to '79 (Antarctic work) Mostly we hung up operations/support by mid March, trips across the Drake ceased at that time except in emergencies. We did operate locally however, just did not cross the Drake to Antarctic Peninsula.
If anything, weather now can be more extreme, unpredictable. (Global Warming) The wind can be more a factor than rain/snow/cold, so figure that in too.
Mostly just depends on your luck and the kind of year they are having.
A few years back .. it froze in Buenos Aires ... unheard of apparently. (June or July mind you) So if it's freezing in B.A., can you imagine being on the road a 1000 miles further South? Such a remote area ... have a plan.
In March, weather could go either way ... but do expect rain and fairly cold, but no worse than high Altiplano, probably better.
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