It won't be news to anyone that wood dries faster when it's hot outside, but it turns out that the rate varies in a fairly predictable way. There's a rule of thumb (one that's backed up by actual science, not wild speculation) that wood dries twice as fast for every 20 degrees Fahrenheit increase in temperature. Using that rule, along with historical daily average temperatures I got from the National Weather Service, I generated this wood drying calendar. It's 365 days long, but the months look a little different than you are used to. With this calendar, wood dries just as fast in January as it does in July, but January is over 10 weeks long, and July is just over 2 weeks. One limitation: it's based on Pittsburgh climate data. It's probably not far off for most parts of the country where hardwoods grow and people burn them for heat, but some areas (deserts, coastal areas) would look very different. Enjoy.