I’ll give the Met Office / Hadley / CRU some due, at least there are signs of actual data.
What-if a list of the dataset grid cells with data from the start Jan 1850 to current is computed? Where are these and what does the data look like?
Figure 1, A fragment in time of the entire consistent Hadcrut 4 gridded data, weighted data as per computing a global mean.
This suggests the reputed bad winters during WWII. Computing the global equivalent would need the weighted mean completing, sum and then divide by the sum of weights. Unweighted (not shown) is similar except the winter 1944 has a hot peak, ie. largely a polar matter. There again without global data is any of this valid?
Here is the global coverage
Figure 2. Unweighted data (as is) for Jan 1942, same coverage always, 1850 or 2015.
This is best viewed as a PDF, which is annotated with the unweighted temperatures and the latitude and longitude centre of each grid cell with data.
Additionally I’ve extracted the time series of each grid cell. Figure 1 is a plotted fragment from that.
This begs the question where are these met sites? Some are easy to guess, others, I have no idea.
Would it be good idea to make this software and data available?
Post by Tim