How about: Temperature Anomaly?
I've been thinking about the temperature display. It has a fundamental problem that to display a geographical range, and therefore a wide range of temperatures, you end up with very little useful detail. As an alternative, a temperature anomaly display would be better, since you would be showing a deviation from a standard local temperature. I'd like to see (eg) a color change when a front passes if the temperature scale goes from the polar to tropical temperatures the effect of a front is barely visible. If you are using a localised scale rather than a global scale it becomes possible to show more gradations.
There are multiple ways to do this, for example, deviation from the same time yesterday (or last few days), or from the climatic average for the place/month/time of day, or from the climatic average for this place/time of year. Different approaches have advantages. Including the diurnal change in the base will show the deviation better, but won't show the things heating up and cooling during the day which might be a bit weird. Another option would be to set the temperature scale shown relative to a local value.
It would be interesting to show temperature anomalies.
ECMWF and NOAA / NCEP provide reanalysis over several years for each forecasting step. This makes it possible to compare the expected temperature with the average observed over several years for the same day of the year. But generally for the temperature, it is the one predicted at 850hPa (in fact the air mass temperature) which is compared. I am not sure that this kind of daily comparison is relevant at a local scale and at ground level, mainly because the resolution of reanalysis is very low (eg 80km for ECMWF)
Below today maps of temperature anomaly at 850hPa