Log into google and wander over to:
This will let you query the GSOD (weather observatory station records) thanks to google big data.
Then execute this query:
SELECT year, mean_temp, max_temperature FROM
[publicdata:samples.gsod] where wban_number=14742 and month=X and day=YY order by year asc;
You'll have to determine the nearest wban_number for the weather station closest to you - to get this yead over to:
And search for your city or state.
Once you are done, you'll end up with numbers than can be plotted as a trend thusly:
If anyone can find a public dB of WBAN lat/lon let me know.