acclimatize

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To acclimate. synonym: harden.
• intransitive verb To adapt (oneself), especially to environmental or climatic changes.
• intransitive verb To become acclimated or adapted.

from The Century Dictionary.

• To become climatically accustomed or habituated to a new locality or to new conditions.
• To accustom or habituate to a foreign climate; adapt for existence in a foreign climate: especially used of adapting a race or stock for permanent existence and propagation: as, to acclimatize plants or animals. Also spelled acclimatise.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To inure or habituate to a climate different from that which is natural; to adapt to the peculiarities of a foreign or strange climate; said of man, the inferior animals, or plants.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb intransitive To get used to a new climate.
• verb transitive To make used to a new climate or one that is different from that which is natural; to inure or habituate to other circumstances; to adapt to the peculiarities of a foreign or strange climate.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb get used to a certain climate