It's not an app (or at least, it isn't a standalone feature of an app), but if you search on wolfram alpha, it usually provides a handy graph for the past. I'm

It's not an app (or at least, it isn't a standalone feature of an app), but if you search on wolfram alpha, it usually provides a handy graph for the past. I'm always wondering the same thing as well. eg http://www.wolframalpha.com/input/?i=weather+san+francisco http://www.wolframalpha.com/input/?i=weather+san+francisco and hit "more" when the "Weather history & forecast" section shows up. I don't know how permanent this URL is, but here's the result I get from that: http://www.wolframalpha.com/input/pod.jsp?id=MSP32441a2b0ia1c88ff8d5000047d3gfiiag46gh6c&s=8&button=1 http://www.wolframalpha.com/input/pod.jsp?id=MSP32441a2b0ia1... I would love to see a better interface on that data as a standalone app.