This is a graph of the temperatures inside and
outside of my room for the past 24 hours in
Forth Worth, TX.

Past 24 Hours

Past Week and Month

This works using Brian Lane's digitemp software
which runs from cron every ten minutes and puts the
temperatures into a Round Robin Database which is then
read by a CGI script that draws the graph you see. The
graph gets redrawn each time the page is requested
from the server, and this page refreshes every
10 minutes so there is no need to refresh it manually
(if you hit refresh within 10 minutes, it will simply
draw you the same graph, so there is no need).