Reference

SST: Reynolds and Smith OI Climatology, EMC/NCEP.
http://www.emc.ncep.noaa.gov/          research/cmb/sst_analysis/images/sstclim.MAR.gif

Rain: Legates /MSU Precipitation Climatology, 1972-1992.
http://tao.atmos.washington.edu/legates_msu/