My Acurite 5-in-1 is reading much higher temperatures in the daytime than nearby stations. Sometimes around 10°.
See my WU page: http://www.wunderground.com/personal-weather-station/dashboard?ID=KVAROANO51#history
What could be causing this?
If you see a 10F degree difference, that's a good indication your aspiration fan isn't running.
I just took a look at the map around your area... right now I see readings of 20F to almost 40F, you're at 33F. That seems like a lot of variance within your vicinity, but I've no idea what's normal in your region.