Hello!
The Analytics team would like to announce that the Pageview API is able to return monthly pageview stats as of this week.
For example, the request below will get you a monthly count of pageviews for de.wikipedia's article Barack_Obama for the year 2016 (note 'monthly' parameter on url)
http://wikimedia.org/api/rest_v1/metrics/pageviews/per-article/de.wikipedia/... *monthly*/2016010100/2016123100
More documentation and examples can be found on our quickstart guide: https://wikitech.wikimedia.org/wiki/Analytics/PageviewAPI#Quick_Start
Thanks,
Nuria