The best resource for finding historical weather data is the National Climatic Data Center. Their most detailed information is available at their Online Store. Because the site is so big and hard to navigate, here are the most helpful areas:
El Nino/La Nina
Local Storm Reports
Recent Events (past 10 years)
Hail Maps and Hail History Reports
Storm Prediction Center Archive
Radar Image Archive
Upper Air Data Archive
30-year Climatological Data
National Diurnal Climatology New!
NCDC Complete List
If you want quick information for a specific date, nothing is easier than the Weather Underground.
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