Thermometer Fluctuations

At 1:35am, a thermometer located in Room 11 (Cason: Model C70) started to fluctuate between 18.3ºc and 19.0ºc.  Periodic readings had been taken on a regular basis prior to this from 10pm with no real difference in temperature.  After a further 15 minutes, it was decided to relocate the thermometer to Room 10 for further analysis, the temperature was stable.  So could the fluctuations recorded in Room 11 have been caused by a draught?  A second thermometer (Oregon Scientific: Model THM912) that was placed in Room 11 remained steady at a temperature of 17.6ºc.  The Cason was then returned to Room 11 and the temperature remained stable until 3:18am when the fluctuations were repeated, this time between 17.0ºc and 18.4ºc.  So to prove a point the OS thermometer was placed alongside the Cason but the temperature remained stable whilst the Cason continued  to rise and fall.  The Cason thermometer was bought in July 2004 so is a reasonably new piece of equipment.  However, it has been used constantly on a daily basis and has never fluctuated like this before.  The graph below shows how the fluctuations occurred during a 2 minute period.

The following day after the vigil, some testing was carried out on both thermometers, they were placed in a room alongside each other and the temperature remained steady at 22.2ºc (Cason), 22.1ºc (OS Internal) and 22.3ºc (OS External).  They were both then placed near an open window and the following results (see below) were recorded.

To summarise, the Cason obviously has a slower response rate as does the internal sensor on the OS and as expected the external probe is far more responsive.  So if this is true, why did the Cason thermometer fluctuate so quickly and why did it only fluctuate in one specific location?  What do you think?  Maybe you have experienced a similar incident.  Maybe there is a rational explanation.  Maybe it was paranormal???  EMAIL US with your views.