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#!/usr/bin/env python

# This script extracts the average daily precipitation for each month.

from datetime import datetime, timedelta

# Change the start and end dates to your desired date range. Monthly data is specified as the 1st of the month.
# For example, to get January 1979 to December 1980, use (1979, 1, 1) and (1980, 12, 1), respectively

start = datetime(1979, 1, 1)
end = datetime(1980, 12, 1)

datelist = [start.strftime('%Y-%m-%d')]
while start <= end:
    start += timedelta(days=32)
    datelist.append( datetime(start.year, start.month, 1).strftime('%Y-%m-%d') )
datestring = "/".join(datelist)

from ecmwfapi import ECMWFDataServer
server = ECMWFDataServer()
server.retrieve({
    "class": "ei",
    "dataset": "interim",
    "date": datestring,
    "expver": "1",
    "grid": "0.75/0.75",
    "levtype": "sfc",
    "param": "tp",
    "step": "0-12",
    "stream": "mdfa",
    "type": "fc",
    "area" : "75/-15/30/35",
    "format": "netcdf",
    "target": "tp-mdfa-197901to198012.nc",
})