I continuously monitor temperatures in Kaiserslautern. These charts are updated every 15 minutes, if my computer at home is up and running. Please note that the summaries for each graph differs because the data is consolidated before the graphs are generated. The 24-hour graph shows the most recent readings.
If you want to know the technical details of my setup, please have a look at this post. I developed my own hardware to measure the temperature. It is an open-source project.