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The official normals are calculated for a uniform 30 year period, and consist of annual/seasonal, monthly, daily, and hourly averages and statistics of temperature, precipitation, and other climatological variables from almost 15,000 U.S. weather stations.
Las Vegas weather averages and climate Las Vegas, Nevada. Monthly temperature, precipitation and hours of sunshine. A climate graph showing rainfall, temperatures and normals.
May 4, 2021 · Every 10 years, NOAA releases an analysis of U.S. weather of the past three decades that calculates average values for temperature, rainfall and other conditions. That time has come again. Known as the U.S. Climate Normals, these 30-year averages — now spanning 1991-2020 — represent the new “normals” of our ch
- Why Update U.S. Climate Normals?
- Changes Since 1981–2010 Climate Normals
- Climate Normals and Climate Change
- Future Releases
Member states of the World Meteorological Organization(link is external)(WMO) are required to calculate their country’s normals at ten-year intervals. Countries follow recommendations by the WMO, which provides a framework for international cooperation among meteorologists, climatologists, and hydrologists. The decadal update is the equivalent of t...
As anticipated, changes have occurred in averages since the last ten-year update. Since two-thirds of the data (1991–2010) in the new set overlap with the previous version, changes can be subtle, depending on the region, season, and timeframe. Nonetheless, an upward shift in temperature averages is evident. The 1981–2010 average temperature for the...
Rather than track or define long-term trends or changes in climate, U.S. Normals are useful to understand present-day conditions. For climate monitoring activities at NCEI, longer periods are referenced. The monthly State of the Climate reports produced for the United States and globe use twentieth-century averages (1901–2000) as benchmarks and wil...
Additional products and services will be released later in 2021 and into 2022, including Daily Gridded Temperature and Precipitation Normals. Plans are also underway for NOAA NCEI to become a repository for climate normals from countries around the world.
The following graphics show averages for temperatures, precipitation, and snowfall for each day of the year and each month at several observing sites across western South Dakota and northeastern Wyoming. Recently, year-to-date departures from these averages were also added.
Phoenix weather averages and climate Phoenix, Arizona. Monthly temperature, precipitation and hours of sunshine. A climate graph showing rainfall, temperatures and normals.
The new 30-year climate normal values (the average conditions to be expected) have been released after careful calculations by NOAA's National Center for Environmental Information (NCEI). This information uses data collected between 1991 and 2020.
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