Hello Chris,

Acceptable humidity and temperature ranges depends on a)time of year
(summer/winter) and b)type of artifact.

Some ranges for you,

Oil paintings -
winter months = temp:65 - 70degrees F; humid:40-45%
summer months = temp:70-75 degrees F; humid:45-55%

Wooden objects + Furniture -
winter months = temp:70 degrees F; humid:35-45%
summer months = temp:70 - 75 degrees F; humid:55-65%

Archival-
temp:65 - 69 degrees F; humid:45-49%

Paper-
winter months = temp:15-20 degrees Celsius; humid:35-50%
summer months = temp:20 - 25 degrees C; humid:50-55%

I hope this helps,

Michael Dunn
"Artifact Specialist"
BC Heritage Branch
Victoria, BC Canada


>From: Chris Woodson <[log in to unmask]>
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>Subject: Humidity in Museums
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>Hi,
>I was wondering if anyone out there has experience or knowledge of humidity
>inside museums.  I am currently involved in compiling data regarding the
>humidity levels in our exhibit hall.  We have hygrometers strategically
>placed throughout the building and I have been developing a spreadsheet
>with
>the accumulated data.  What I am wondering is, what humidity level is
>considered acceptable in a museum environment?
>
>Thanks,
>Chris Woodson
>Roanoke Island Festival Park
>Manteo, NC
>
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