diff --git a/tools/analysis/Makefile b/tools/analysis/Makefile
index 1c6304cead..a6238cb582 100644
--- a/tools/analysis/Makefile
+++ b/tools/analysis/Makefile
@@ -7,17 +7,22 @@
 EXPDIR = /archive/John.Dunne/ulm_201505_awg_v20151106_mom6sis2_2015.12.17/CM4_c96L32_am4g7_2000_OMp5_DR_H3_MEKE/gfdl.ncrc2-intel-prod-openmp
 GRIDSPEC = /archive/gold/datasets/OM4_05/mosaic.v20151203.unpacked
 WOA = /archive/gold/datasets/OM4_05/obs/WOA05_ptemp_salt_annual.v2015.12.03.nc
+WOA_M = /archive/gold/datasets/OM4_05/obs/WOA05_ptemp_salt_monthly.v2015.12.03.nc
 
 # Settings for the 0.25 degree configuration
-#EXPDIR = /archive/Alistair.Adcroft/ulm_201505_awg_v20151106_mom6sis2_2016.01.16/CM4_c96L32_am4g7_2000_lowmix_hycom5_BS/gfdl.ncrc3-intel15-prod-openmp
+#EXPDIR = /archive/ogrp/verona_201701_awg_v20170208_g12_mom6_2017.03.17/CM4_c96L32_g12r17_2010_OM25_10d_s3lt_FK10/gfdl.ncrc4-intel15c3exec-prod-openmp
 #GRIDSPEC = /archive/gold/datasets/OM4_025/mosaic.v20140610.tar
 #WOA =  /archive/gold/datasets/OM4_025/obs/WOA05_ptemp_salt_annual.v20150310.nc
+#WOA_M = /archive/gold/datasets/OM4_025/obs/WOA05_ptemp_salt_monthly.v20150310.nc
 
-all: sst sss zonalT zonalS zave sections moc mld heattransport
+all: sst sst_monthly sss zonalT zonalS zave sections moc mld heattransport
 
 sst:
 	./SST_bias_WOA05.py -w $(WOA) -g $(GRIDSPEC) -l 0001-0005 $(EXPDIR)/pp/ocean_annual_z/av/annual_5yr/ocean_annual_z.0001-0005.ann.nc $(OUTOPTS)
 
+sst_monthly:
+	./SST_monthly_bias_WOA05.py -w $(WOA_M) -g $(GRIDSPEC) -l 0001-0005 $(EXPDIR)/pp/ocean_monthly/av/monthly_5yr/ocean_monthly.0001-0005.01.nc $(EXPDIR)/pp/ocean_monthly/av/monthly_5yr/ocean_monthly.0001-0005.08.nc $(OUTOPTS)
+
 sss:
 	./SSS_bias_WOA05.py -w $(WOA) -g $(GRIDSPEC) -l 0001-0005 $(EXPDIR)/pp/ocean_annual_z/av/annual_5yr/ocean_annual_z.0001-0005.ann.nc $(OUTOPTS)
 
diff --git a/tools/analysis/SST_monthly_bias_WOA05.py b/tools/analysis/SST_monthly_bias_WOA05.py
new file mode 100644
index 0000000000..3d9e35bf6b
--- /dev/null
+++ b/tools/analysis/SST_monthly_bias_WOA05.py
@@ -0,0 +1,96 @@
+#!/usr/bin/env python
+
+import netCDF4
+import numpy
+import m6plot
+import m6toolbox
+import os
+import sys
+
+def run():
+  try: import argparse
+  except: raise Exception('This version of python is not new enough. python 2.7 or newer is required.')
+  parser = argparse.ArgumentParser(description='''Script for plotting annual-average SST bias.''')
+  parser.add_argument('monthly_file', type=str, nargs='+', help='''Annually-averaged file or csv list of files containing 2D 'sst'.''')
+  parser.add_argument('-l','--label', type=str, default='', help='''Label to add to the plot.''')
+  parser.add_argument('-s','--suptitle', type=str, default='', help='''Super-title for experiment.  Default is to read from netCDF file.''')
+  parser.add_argument('-o','--outdir', type=str, default='.', help='''Directory in which to place plots.''')
+  parser.add_argument('-g','--gridspec', type=str, required=True,
+    help='''Directory containing mosaic/grid-spec files (ocean_hgrid.nc and ocean_mask.nc).''')
+  parser.add_argument('-w','--woa', type=str, required=True,
+    help='''File containing WOA (or obs) data to compare against.''')
+  cmdLineArgs = parser.parse_args()
+  main(cmdLineArgs)
+
+def main(cmdLineArgs,stream=None):
+  numpy.seterr(divide='ignore', invalid='ignore', over='ignore') # To avoid warnings
+
+  if not os.path.exists(cmdLineArgs.gridspec): raise ValueError('Specified gridspec directory/tar file does not exist.')
+  if os.path.isdir(cmdLineArgs.gridspec):
+    x = netCDF4.Dataset(cmdLineArgs.gridspec+'/ocean_hgrid.nc').variables['x'][::2,::2]
+    xcenter = netCDF4.Dataset(cmdLineArgs.gridspec+'/ocean_hgrid.nc').variables['x'][1::2,1::2]
+    y = netCDF4.Dataset(cmdLineArgs.gridspec+'/ocean_hgrid.nc').variables['y'][::2,::2]
+    ycenter = netCDF4.Dataset(cmdLineArgs.gridspec+'/ocean_hgrid.nc').variables['y'][1::2,1::2]
+    msk = netCDF4.Dataset(cmdLineArgs.gridspec+'/ocean_mask.nc').variables['mask'][:]
+    area = msk*netCDF4.Dataset(cmdLineArgs.gridspec+'/ocean_hgrid.nc').variables['area'][:,:].reshape([msk.shape[0], 2, msk.shape[1], 2]).sum(axis=-3).sum(axis=-1)
+    depth = netCDF4.Dataset(cmdLineArgs.gridspec+'/ocean_topog.nc').variables['depth'][:]
+  elif os.path.isfile(cmdLineArgs.gridspec):
+    x = m6toolbox.readNCFromTar(cmdLineArgs.gridspec,'ocean_hgrid.nc','x')[::2,::2]
+    xcenter = m6toolbox.readNCFromTar(cmdLineArgs.gridspec,'ocean_hgrid.nc','x')[1::2,1::2]
+    y = m6toolbox.readNCFromTar(cmdLineArgs.gridspec,'ocean_hgrid.nc','y')[::2,::2]
+    ycenter = m6toolbox.readNCFromTar(cmdLineArgs.gridspec,'ocean_hgrid.nc','y')[1::2,1::2]
+    msk = m6toolbox.readNCFromTar(cmdLineArgs.gridspec,'ocean_mask.nc','mask')[:]
+    area = msk*m6toolbox.readNCFromTar(cmdLineArgs.gridspec,'ocean_hgrid.nc','area')[:,:].reshape([msk.shape[0], 2, msk.shape[1], 2]).sum(axis=-3).sum(axis=-1)
+    depth = m6toolbox.readNCFromTar(cmdLineArgs.gridspec,'ocean_topog.nc','depth')[:]
+  else:
+    raise ValueError('Unable to extract grid information from gridspec directory/tar file.') 
+
+
+  # open dataset
+  rootGroup = netCDF4.MFDataset( cmdLineArgs.monthly_file )
+
+  # gather months from input dataset
+  tvar = rootGroup.variables['time']
+  times = [netCDF4.num2date(i,tvar.units,calendar=tvar.calendar.lower()) for i in tvar[:]]
+  idx = list(set([i.month-1 for i in times]))
+  month_label = list(set([i.strftime('%b') for i in times]))
+  month_label = str('Months: ')+ str.join(', ',month_label)
+
+  # read sst from model 
+  if 'sst' in rootGroup.variables: varName = 'sst'
+  elif 'tos' in rootGroup.variables: varName = 'tos'
+  else: raise Exception('Could not find "sst", "ptemp" or "tos" in file "%s"'%(cmdLineArgs.monthly_file))
+  if rootGroup.variables[varName].shape[0]>1: Tmod = rootGroup.variables[varName][:].mean(axis=0)
+  else: Tmod = rootGroup.variables[varName][0]
+
+  # read sst from obs
+  Tobs = netCDF4.Dataset( cmdLineArgs.woa )
+  if 'temp' in Tobs.variables: Tobs = Tobs.variables['temp']
+  elif 'ptemp' in Tobs.variables: Tobs = Tobs.variables['ptemp']
+  else: raise Exception('Could not find "temp" or "ptemp" in file "%s"'%(cmdLineArgs.woa))
+  if len(Tobs.shape)==3: Tobs = Tobs[0]
+  else: Tobs = Tobs[idx,0].mean(axis=0)
+
+  # create title for plot
+  if cmdLineArgs.suptitle != '':  suptitle = cmdLineArgs.suptitle + ' ' + cmdLineArgs.label
+  else: suptitle = rootGroup.title + ' ' + cmdLineArgs.label
+  suptitle = suptitle+'\n'+month_label
+
+  # invoke m6plot
+  ci=m6plot.pmCI(0.25,4.5,.5)
+  if stream is None: stream = cmdLineArgs.outdir+'/SST_bias_WOA05.png'
+  m6plot.xyplot( Tmod - Tobs , x, y, area=area,
+      suptitle=suptitle, title='SST bias (w.r.t. WOA\'05) [$\degree$C]',
+      clim=ci, colormap='dunnePM', centerlabels=True, extend='both',
+      save=stream)
+
+  m6plot.xycompare( Tmod, Tobs , x, y, area=area,
+      suptitle=suptitle,
+      title1='SST [$\degree$C]',
+      title2='WOA\'05 SST [$\degree$C]',
+      clim=m6plot.linCI(-2,29,.5), colormap='dunneRainbow', extend='max',
+      dlim=ci, dcolormap='dunnePM', dextend='both', centerdlabels=True,
+      save=cmdLineArgs.outdir+'/SST_bias_WOA05.3_panel.png')
+
+if __name__ == '__main__':
+  run()