Weather Data

NOAA Historical Climate Data
Select state in menu on right side, then weather station. You can use the radio buttons to get daily or hourly data. When you add to your cart, you will receive the data in an email.
Western U.S. Climate: Historical Summaries
Historical data for hundreds of weather stations, including temperature, sunshine, sky cover, pressure, humidity, precipitation and wind
RAWS USA Climate Data Archive
Weather data from Remote Automated Weather Stations (RAWS) across the country
State Climate Summaries
State overviews of historical climate change and future projections
NCAR Real-Time Weather Data
Data, including radar and upper-air maps, plus satellite imagery

Mammatus Clouds, Meridian, Idaho
By Kfengler [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons