That would be a good idea to fix the average. Both figures could still be recorded (the weighted average you propose and actual highs and lows) with the current data, but if it is 55 at LNS or MDT at midnight, it looks like a short heatwave in what was really a wintery two-day period. This is one of those issues that is really not an issue in the big scheme of the world, but we spend some much time talking anomalies here, this is a bit of an issue in really relying on the actual weather of the past. With all this said, Friday could end up being one of the top differences between high and low for a day when all said and done.