You can use a Python program to extract ERA-Interim and other data remotely from ECMWF's archive system MARS. For an introduction see here.
When extracting data from daily data you can specify a date range, for example for all days of the year 2015:
"date": "2015-01-01/to/2015-12-31",
This does not work for monthly means.
The monthly means are timestamped to the first day of the month, and you have to extract for exactly these dates. So to extract monthly means for all of 2015 you need to use this syntax to specify dates:
"date": "20150101/20150201/20150301/20150401/20150501/20150601/20150701/20150801/20150901/20151001/20151101/20151201",
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