Daily temperature and precipitation data from stations in the National Weather Service Cooperative Observer Program.

Unofficial hourly and daily weather data from airport weather stations nationwide.

Regional climate data provided by the University of Nebraska

Data from the Midwestern Regional Climate Center

Data from the Northeast Regional Climate Center

Data from the Southeast Regional Climate Center

Data from the Southern Regional Climate Center

Data from the Western Regional Climate Center

The Climate Diagnostics Center (CDC) studies the interrelationships among climate variables to acquire an improved understanding and prediction of the climate

Climate highlights including hazards, drought, and hurricane assessments from the National Weather Service

An archive of climate data from the NCDC

Data sets by topic including agriculture, biosphere, atmosphere, oceans, paleoclimate, snow and ice, climate indicators, hydrosphere, land surface, and radar/satellite provided by NASA

National climate maps of precipitation, maximum and minimum temperatures