GCM mean (dark blue # 1) and envelope (lighter blue) range of global surface temperature projections vs. HadCRUT4 (red # 1) and Cowtan & Way (red # 2) global surface
temperature instrumental estimates.
However, proxy records are not as well distributed as weather stations, and so for these multi-centennial reconstructions there is more weight attached to each proxy than it would be for a weather station at the same spot in
an instrumental estimate.
In fact, it is clear that
the instrumental estimates run a bit warm relative to all of the proxy reconstructions (i.e., they suggest even less of a «little ice age» in the 18th and 19th centuries).