Here's a graph of open rates and click rates for a newsletter I send out 1-2 times a month:
https://www.dropbox.com/s/97lfk7clhj12flu/newsletter.png
According to Mailchimp, the list has an average open rate of 58% and an average click rate of 20%.
EDIT: hippo3 mentioned actively unsubscribing people who are not opening, in order to get a list with a high concentration of people who consistently open. As my newsletters contain no third party ads or promotions, I don't do such pruning.
I think there are a few reasons why our newsletters are well read:
- The content is very specific to our niche
- The target audience is members of our services
- Even though most readers are customers, they still have to opt-in to receive the newsletters
- I don't send newsletters out often, only 1-2 times a month
- The newsletters are sent out at pretty regular intervals, usually on Tuesday morning in the third week of the month
- The newsletters aren't very long, readers have to click through to read the entire articles