Actually, in the grand scheme of climate studies, this really isn't a huge collection of data. Nevertheless, with only eleven degrees of freedom, this data rejects the null hypothesis that the tire-changing date is not getting earlier every year with 90% confidence. Which is basically the conclusion that thousands of scientists working for years on the UNIPCC came to.
Good work, Doctor! The government might take bold steps to reduce carbon pollution or it might do nothing at all; either way, this tire changing chore won't last much longer.