All conclude that 20th century is the warmest of the millennium and the warming during it unprecedented since 1400. All centuries this millennium are cooler than the 1961-90 base period - the 20th by about -0.05 and the 17th (coldest) 0.5 below 1961-90. Warmest century in the first half of the millennium was about 0.1-0.2 below 1961-90. Range of values of decades over the last 1000 years is quite small - 1990s about 0.35 and 1601-1610 -0.7. Even the coldest year of 1601 was only about 1 C below 1961-90. This level of variability of hemipsheric average temperature is in accord with the long model control runs and the few runs with solar forcing since ~ 1650.
Email 4582, Feb 2009, Phil Jones on global average surface temperature: "The work that estimated the 14 number (it was 14.02 for the globe) made lots of assumptions over the sea ice areas and the Antarctic. I always thought this was accurate to about +/- 0.5 deg C"