preparation:
upload.py should be on one computer, and download.py and weather_extract.py should be on another. all the weather data should be saved in the same directory as upload.py called "data." the downloaded data will be stored in the same directory as download.py called "data." the time dependent data should be stored in a directory called "input&output" under the same directory as the weather_extraction.py. the output file will also be in that directory.
execution:
execute weather_extract.py directly with the system arguments: time dependent filename, new file name, weather station name.