Linksys WRT54G User Manual page 96

Wireless-G Broadband Router
Operating Temp. 0ºC to 40ºC (32ºF to 104ºF)
Storage Temp. -20ºC to 70ºC (-4ºF to 158ºF)
Operating Humidity 10% to 85%, Non-Condensing
Storage Humidity 5% to 90%, Non-Condensing
Appendix G: Specifications 88