I’m waiting for May global land + ocean temperature data to be published from Hadley Climate Research Unit, at which time I’ll also show a comparison to GISS.
Since I did pretty well at guessing what RSS May data value would be, guessing 0.05 to -0.15°C, and having it end up at -.083°C, I’m going to put forth one for CRU.
My SWAG for HadCRUT is between +0.10 and +.0.17°C
Here is April 2008 from HadCRUT at 0.25°C
Click for a larger image
Reference: HadCRUT3 anomaly data which can be found here
description of the HadCRUT3 data file columns is here