Profiling readers/visitors via AdSense earnings?

Ely popped the question — is your AdSense income seasonal? Generally, I’d alway say yes based on annual data from 2 or three years ago.

However, this trend may not be leveling out for everyone because I think it still depends on several factors;

• The type of site you are running. Is it a portal, a forum or a blog? Some type of sites perform better than others because of the mix of readers and visitors. Let me clarify first that when I say readers, these are your direct viewership which may type in directly, bookmark you or added you on their feed readers. On the other hand, I refer to visitors as being one-time traffic coming from search engines or social sites like Digg.
• The number of sites you are running AdSense on. While some sites may perform better on a given month, others might not. Unless you’re just basing your observations on a single site, it’s hard to pinpoint it really.
• Type of visitors your site attracts. Are they gamers, blog readers, office workers, students, chatters or forumers? One can guess but hard to tell — unless your blog or website has a really narrow niche.
• Traffic trends. It might just be a fluke — AdSense revenues down despite an increase in traffic or vice versa. Smart pricing could be a culprit too.
• Search trends. People might search more on some days than other days. Expected annual events are usual culprits.
• Lest we forget, advertiser budget. There will be months that advertisers would splurge on their AdWords account and then totally stop once all ad budget have been used up.

There could be more circumstantial reasons out there. It’s really hard to tell.