 

Field
PRISM dew point
PRISM analysis 4kM1
X axis: regular grid with 1405 0.04° steps, first point at 125.00° W, last point at 66.50° W Y axis: regular grid with 621 0.04° steps, first point at 24.08° N, last point at 49.92° N Monthly data available from Jan1895 to Dec2017 (1476 months) Variable tdmean (monthly mean of dew point temperature) in Celsius Full metadata. Construct a statistical forecast model from this field Compute anomalies
Compute zonal mean
If you really want to get it here, PRISM dew point is available as a netcdf file (size 1560.5 MB). 
© KNMI
