Graphs and lists of daytime temperatures in Nice, France, since 8 January 1994 - an example of data re-use.
The solid red line shows a sine function that passes through the highest (27°C) and lowest (13°C) average daytime temperature. The other symbols and lines show actually measured temperatures.
The same graph as above, but showing the period 1 Jan - 31 Dec 1999.
The same graph as above, but showing the period 1 Jan - 31 Dec 1998.
The same graph as above, but showing the period 1 Jan - 31 Dec 1997.
The same graph as above, but showing the period 1 Jan - 31 Dec 1996.
The same graph as above, but showing the period 1 Jan - 31 Dec 1995.
The same graph as above, but showing the period 1 Jan - 31 Dec 1994.
These graphs are derived from data provided by CNN, RainOrShine and Weather-Underground, three information providers that provide daily weather data. Every day, a robot automatically extracts from the three sites the measured temperatures in Nice and stores them. Another robot creates the above graphs from the data, and adds the sine-wave approximation.
The extracted data is available in three files, one file for CNN, one file for RainOrShine and one file for Weather-Underground. The first column is the date at which the robot has run, the second is the date found on the Web site, and the third column is the temperature in degrees Celcius.
There are occasional errors (impossible temperatures) and missing days, but on the whole the sites seem to be pretty good at updating their page every day.
[6 Jan 1999] On Dec 1st, 1999, RainOrShine changed the URL of the forecast for Nice. On Oct 4, 2000, CNN did the same. Why oh why do people do that!?