USGS provides access to over 135 years of high-quality and discoverable water data collected at more than 1 million monitoring locations across the United States and territories.

WaterWatch is a U.S. Geological Survey (USGS) World Wide Web site that displays maps, graphs, and tables describing real-time, recent, and past streamflow conditions for the United States.

National Weather Service (NWS) Climate Prediction Center (CPC) generates outlooks that view probabilities of above- or below-normal temperature and precipitation maps at the 6-10 Day, 8-14 Day, Week 3-4, One Month, and Three Month timescales.

NCEI provides precipitation data that can be used to show probability or the amount of precipitation to ameliorate or end a drought at different monthly scales.

The Regional Climate Centers (RCC) Applied Climate Information System (ACIS) offers interactive temperature and precipitation charts with single- or multi-station capabilities.

NCEI provides a variety of temperature and precipitation products available at the National and Global scale.

The National Weather Service's National Water Prediction Service (NWPS) provides river stage observations and forecasts and long-range river flood outlooks across the lower 48 United States, Puerto Rico, and Alaska. 

U.S Forest Service Cumulative Drought Severity Index (CDSI): allows users to compare the severity of droughts experienced by different forest ecosystems between two periods, 1960-1986 & 1987-2013.

The research-based website NationalSoilMoisture.com provides high-resolution gridded soil moisture products derived from in situ soil moisture measurements, Natural Resources Conservation Service SSURGO soil characteristics, and PRISM data.

The U.S. Drought Monitor (USDM) is a weekly map, released each Thursday, to show the location and intensity of drought across the country.