Your newsletter must be very up to date. It should be a one that is quickly readable and rich in content. People do not have time to read long descriptive articles. They should be very short and must be able to arouse curiosity of the reader to view the contents. People who send newsletters monthly are able to add rich content. Usually those that send a newsletter weekly do not have new content to present to the customers and they are quickly written and unattractive newsletters. I know by experience the difference between the two.
Weekly newsletter becomes a common one and people tend to ignore them. Your monthly newsletter can be well designed with pictures easily downloadable and you can state the special discount offers that month and invite the customer to your website. People who see a differently designed newsletter are more likely to be in contact with you longer.
One method of getting a visitor to your website is asking your readers to state their opinions about the newsletter. This way, customers feel that they are part of your business.