This script is also called by cron, so the graphs are updated every 30 minutes. A more detailed description of the scripts written for this project are available. The daily temperature cycle is fairly consistent. On weekend, when no one is in the building and the equipment is mostly idle, the temperature is at its lowest at about 6AM, just before the sun rises. The temperature spikes as the sun rises, until about noon when the sun finally passes overhead and is no longer shining directly into our east-facing windows.
Weekdays are a little bit different.
The temperature is still at its minimum before the sun rises, and peaks at about noon.