Local Climatological Data

A monthly summary from major airport weather stations that includes a daily account of temperature extremes, degree days, precipitation and winds. Also included are the hourly precipitation and abbreviated 3-hourly weather observations.

Regional Snowfall Index

NOAA produces the Regional Snowfall Index (RSI) for significant snowstorms that impact the eastern two-thirds of the United States. The RSI ranks snowstorm impacts on a scale from 1 to 5, similar to the Fujita scale for tornadoes or the Saffir-Simpson scale for hurricanes.


U.S. Snow Climatology

Here you can access snowfall and snow depth statistics for several thousand non-airport stations in the National Weather Service (NWS) Cooperative (COOP) Network across the contiguous U.S. and Alaska. Data are available for daily, monthly, and seasonal snowfall and snow depth totals, which are useful in economic and engineering decision-making, and provide the Federal Emergency Management Agency (FEMA) with an objective basis for declaring federal snow disasters.

Tornado Climatology

This online resource examines tornado activity across the United States across temporal and spatial scales. The contiguous United States is the most active tornado region in the world, with an average of 1,253 tornadoes occurring annually. The information and data provided here serves as a baseline for comparing current tornado activity to the past, providing a complete historical perspective.

International Best Track Archive for Climate Stewardship (IBTrACS)

NOAA’s IBTrACS system provides tropical cyclone best-track data in one centralized location to aid understanding of the distribution, frequency, and intensity of tropical cyclones worldwide.

U.S. Heat Stress Index

When both temperature and humidity are high, humans can experience considerable heat stress. In the U.S., extreme heat may have greater impact on human health, especially among the elderly, than any other type of severe weather.

Severe Weather Data

This online resource provides links to several NOAA online severe weather databases, including the Storm Events Database and the Severe Weather Data Inventory.  These databases provide online access to files for storm and hurricane data in commonly used formats, such as shapefiles for GIS applications, KMZ for Google Earth, comma-separated values, and extensible markup language (XML).

North America Climate Extremes Monitoring

This tool was developed to improve understanding of changes in extreme climate conditions by giving users an ability to examine trends and occurrences of certain types of extreme or threshold events at a station-by-station level. It currently provides data and analysis for eight indices that have been defined by the World Meteorological Organization (WMO). An interactive map allows users to select a month, season, or specific year (from 1955 to present) to view a snapshot of values for a specific index across North America. 

Climate Extremes Index

The Climate Extremes Index charts the occurrence of specific extreme events in the United States from 1910 to present. In most cases, extreme events are defined as being in the outermost (“most unusual”) ten percent of a place’s history. Extreme event indicators tracked include monthly maximum and minimum temperature, daily precipitation, drought severity index, and tropical storm wind velocity. Analyses are available at the national and regional levels.

U.S. Record-Setting Events

This NOAA National Climatic Data Center tool allows users to look up record-setting events for a given day, month, or all time.  Specifically, users can look for record highest minimum or maximum temperature, lowest min/max temperature, precipitation, or snowfall.  This information is available for individual U.S. states, U.S. regions, and U.S. territories.