This post is a bit late this month. I've been holding it waiting for GHCN results from China and Canada. China has finally come in - still no Canada. Anyway, the TempLS mesh index was 0.717°C, slightly up from Feb 0.698.
One reason for delay was that I had predicted a slight rise, and I didn't want that result to be unsettled. The margin was very fine, but China raised it somewhat. It's still possible that Canada could bring it down.
As mentioned in earlier posts, although temperatures are not changing rapidly, they are very warm. The first three months of 2015 were each warmer than any month of 2014 (thanks, MMM). The NCEP/NCAR index for April has a sudden dip.
The greatest warmth was in the North - Siberia and Canada, extending into N Europe and W Canada. Coldest was again East N America, and also a patch in N Atlantic. Troposphere measures (UAH and RSS) were down slightly, but Roy Spencer noted a similar pattern. Surface coldness was less extreme in E N America.