awesomepossum.py

import os, rasterio
import matplotlib.pyplot as plot

basedir = '/Users/dnomadb/Documents/pwat_hrrr/'
savedir = '/Users/dnomadb/Documents/pwat_hrrr_pngs/'

with rasterio.drivers():
    for i in os.listdir(basedir):
        if i.split('.')[-1] == 'grib':
            print i
            # fig = figure()
            with rasterio.open(os.path.join(basedir, i), 'r') as src:
                fig = plot.imshow(src.read_band(1), cmap='YlGnBu_r')
                plot.axis('off')
                fig.axes.get_xaxis().set_visible(False)
                fig.axes.get_yaxis().set_visible(False)
                plot.savefig(os.path.join(savedir, i.replace('.grib', '.png')),bbox_inches='tight')