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Generally, if you are comfortable, then your books are probably in a safe environment. Below 70 degrees Fahrenheit and below 50% Relative Humidity is a good benchmark.
Your key goal is a stable environment where mold is unlikely to thrive. Mold is one of the most difficult and expensive issues to trreat in a library collection. MAintaining a mold-inhibiting environment is one of the most important things you can do to preserve your library collections.
Useful Links on Proper Storage Environments
Library of Congress - Care, Handling & Storage of Works on Paper
Works on paper generally refer to flat (as opposed to bound) paper materials, including documents, manuscripts, drawings, prints, posters, and maps. Taking care when handling any collection item is one of the more effective, cost-efficient, and easily achieved preservation measures.
USGS Environmental Guidelines for Information Storage
USGS Guidelines recommended for their paper, media, film, video and photograph holdings. A very handy table.
Smithsonian Institution Storage Guidelines
HOUSING AND ENVIRONMENT OPTIONS FOR STORAGE OF DOCUMENTS
NISO - Environmental Guidelines for the Storage of Paper Records
This technical report is the authoritative set of guidelines for storage of paper-based materials.