Which is potentially useful if the aggregate is weighted appropriately and whatever insights respect the implications of using an aggregate. It's even more usef

Which is potentially useful if the aggregate is weighted appropriately and whatever insights respect the implications of using an aggregate. It's even more useful with the additional information that temperatures in the US tend to be highly correlated between areas. Some useful insights if you have enough data points would be where in the year you are, which season it is, if it might be an El Nino or la Nina year, and over the long term if there are any secular trends like global warming...