I really love these questions you all have been leaving in the comments.
Yesterday an observer asked if there is a preferred type of thermometer for using to gather high and low weather data?
My honest answer isn't that there is a preferred type, but use a lot of care when setting up the instrument so that you are getting a true sample of the air temperature.
For example -- if your instrument is too close to a house, shed, deck, etc. it will potentially read warmer than the air temperature from the heat retained in the brick or wood.
Likewise, if it has too much sun exposure it could read higher during the daytime than it really is. You see this a lot on bank signs for example.
Most weather stations you can buy have the temperature sensor in a solar shield I believe.
WWW.AMBIENTWEATHER.COM is a good website to use for researching weather stations.