What kind of weather is it okay to use your ibook in?

Of course I don't mean rain, snow (or mist or fog) or meteors. I live in Chicago and sometimes my work involves me working in a unheated enclosed area. I have power, just no heat. It's starting to get cold out and sometimes I want to use my iBook in this unheated enclosed area. Is there a point that I should not use my laptop? 30 or 40 degrees?
Thanks
Chris

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It might not be a case of catastrophic failure, but the lubrication might not work too well when cold. I've seen some people who are using HDs as MP3 storage devices for their cars. Some in cold weather have problems starting them up in cold weather, although it depends on the individual drive. There are a few awfully expensive and low capacity drives designed for extreme heat and cold.

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