I track my statistics pretty closely, but I also weight them monthly. I've done in a past career-life, market research statistical analysis, and in the land of webserials, you can pretty safely throw out anything more granular than weekly unless you're doing something special like an advertising campaign or promotion.
For certain, there's nothing quite like front-page exposure on WFG to get you a big spike.
Wordpress gives you some useful stats too. A few I recommend paying special attention to:
1. Your conversion rate going from your first chapter to your second. That tells you how many people are washing out of your story before or at the end of chapter 1.
2. Your conversion rate going from second chapter to third, and then third to fourth. These, to lesser degrees, are your indicators of people who are going to go on reading. Some folks might give you more than one chapter to make that impression, but most will wash out in the first entry.
3. Views per visitor. That's a good indication both of spiders crawling your site (common) and binge readers (also common).
4. Direct hits on whatever your latest chapter is. This tells you how many folks are actively *reading* your webserial, post-to-post, and hanging on your next chapter.
USA will represent the majority of your readership. Combination of english language fluency, literacy, internet pervasiveness, and leisure time. Canada will present at similar levels but scaled down to the population. England and Ireland to the same dwindling tails. If I take the month of June for example, about 45% of my unique visitors were American, 10% Canadian, 10% United Kingdom, 8% Australia. So that's just shy of 75% of my readership right there.
Demographics are a sore point for me right now, as I haven't been able to source any firm demographic data. And I'd like to know my audience. Extrapolating from other online media sources: Chances are very good over 70% of your readership is a white person between the ages of 18 and 25. Your genre will strongly skew the gender ratio of your audience. Your average webfiction reader is probably a college kid reading when they should be studying. The majority will be full-time students, with another large demographic chunk being full-time employed at a junior level.
(If anyone can source firmer figures on reader demographics, I will give you a slice of chocolate cake*.)