Don't loose too much sleep over the elements and
their effect on your bronze sculpture this is a super resilient
media.  Unless acid rain pours from the sky in your
neighborhood the bigger threat to your sculpture is
having a child or grown adult bang, ding or scratch
it... oh and if you live in a tornado zone, I suggest indoor
sculptures only.
Bronze is a type of sculpture requiring minimal care or
maintenance. The patinas will darken over time regardless
of what happens in your household uses. The darkening
effect will speed up should you place the sculpture into
areas with daily exposure in sunlight. Bronze sculptures
exposed to water will develop a formation of green tinge on
the bronze, what they call verdigris.
Verdigris does not spell the doom of your bronze. But
don't let it get out of hand either, you should send your art
back to the foundry for re-polishing when you notice the
darkening or verdigris reducing your viewing pleasure.
Unless you`re talking about very large pieces of sculpture
this is not an expensive process.
When putting your bronze sculpture on outdoor
display inform the foundry or gallery ahead of time so they
can protect it with an outdoor patina and specialized wax
coating. If you want your sculpture to always look brand
new it is suggested to wax the piece every 6 months. Many
of the foundries seem to feel Turtle Wax is a good
compound to use.  Please consult with the artist or the
foundry on what they recommend and don't use Turtle
Wax until they tell you this is what they recommend.
No media benefits more from light than the Lucite
sculpture.  If you choose to use natural light for your piece,
have no worry about adverse affects from the Sun. Even in
Death Valley, Lucite would have a hard time melting. On