I am trying to calculate mean of selected raster chosen from multiple raster. I have multiple raster file in different month folder, i am trying to select only two raster (e.g For JANUARY : 001_Max_Temper.tif, 001_Min_Temper.tif) from different month folder (JANUARY, FEBRUARY....DECEMBER) and calculate the mean of those selected raster and save it as on same month folder (e.g output name, JANUARY: 001_Mean_Temp). I have written a code to do this task but i am getting error massage while i am running this code. Below i have attached my code. import arcpy , os , calendar from arcpy import env from arcpy . sa import * arcpy . CheckOutExtension ( "Spatial" ) arcpy . env . parallelProcessingFactor = "100%" topWorkspace = r 'D:\SWAT-WEATHER-DATA2' arcpy . env . workspace = topWorkspace # Get dict of months and month-number (i.e. January = 001, March = 003 etc.) months = { calendar . month_name [ i ] . upper ( ) : str ( i ) . zfill ( 3 ) for i in range ( 1 , 13 ) } # Get dict of months and month number (i.e. January = 001, March = 003 etc.) # Step through list of all folders for folderPath in arcpy . ListWorkspaces ( ) : baseName = os . path . basename ( folderPath ) . upper ( ) if baseName in months : # Test that subfolder is a month name monthNumber = months [ baseName ] # Get month-number for use in output filename arcpy . env . workspace = folderPath rasterList = arcpy . ListRasters ( '*Max_Temper.tif' , '*Min_Temper.tif' ) # Execute CellStatistics outCellStatistics = CellStatistics ( rasterList , "MEAN" , "NODATA" ) #Save the output outRasterName = outCellStatistics , "Mean_Temp_{}.tif" . format ( monthNumber ) outCellStatistics . save ( outRasterName ) #print done print 'done'

... or to be more specific, something like this: import arcpy , os , calendar from arcpy . sa import * arcpy . CheckOutExtension ( "Spatial" ) arcpy . env . parallelProcessingFactor = "100%" topWorkspace = r 'D:\SWAT-WEATHER-DATA2' ws_out = r 'D:\SWAT-WEATHER-DATA2\MeanRasters' ### create this folder!!! arcpy . env . workspace = topWorkspace # Get dict of months and month-number (i.e. January = 001, March = 003 etc.) months = { calendar . month_name [ i ] . upper ( ) : str ( i ) . zfill ( 3 ) for i in range ( 1 , 13 ) } # Get dict of months and month number (i.e. January = 001, March = 003 etc.) # Step through list of all folders for folderPath in arcpy . ListWorkspaces ( ) : baseName = os . path . basename ( folderPath ) . upper ( ) if baseName in months : # Test that subfolder is a month name monthNumber = months [ baseName ] # Get month-number for use in output filename arcpy . env . workspace = folderPath # list rasters rasterList1 = arcpy . ListRasters ( '*Max_Temper.tif' ) rasterList2 = arcpy . ListRasters ( '*Min_Temper.tif' ) # combine lists rasterList = rasterList1 + rasterList2 # Execute CellStatistics outCellStatistics = CellStatistics ( rasterList , "MEAN" , "NODATA" ) #Save the output outRasterName = os . path . join ( ws_out , "Mean_Temp_{}.tif" . format ( monthNumber ) ) outCellStatistics . save ( outRasterName ) #print done print 'done'

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