How Much Has The Climate Changed In The Last 10 Years
This indicator describes trends in average surface temperature for the United States and the world.
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This figure shows how annual average temperatures in the face-to-face 48 states have changed since 1901. Surface data come from country-based weather stations. Satellite measurements cover the lower troposphere, which is the lowest level of the Earth's atmosphere. "UAH" and "RSS" represent two dissimilar methods of analyzing the original satellite measurements. This graph uses the 1901–2000 average as a baseline for depicting change. Choosing a dissimilar baseline period would non modify the shape of the data over fourth dimension.
Data source: NOAA, 20211
Web update: April 2021 -
This figure shows how annual average temperatures worldwide have inverse since 1901. Surface information come up from a combined set of land-based conditions stations and sea surface temperature measurements. Satellite measurements cover the lower troposphere, which is the everyman level of the Earth'due south temper. "UAH" and "RSS" stand for ii different methods of analyzing the original satellite measurements. This graph uses the 1901–2000 average as a baseline for depicting change. Choosing a unlike baseline period would not change the shape of the data over fourth dimension.
Data source: NOAA, 2021two
Web update: Apr 2021 -
This figure shows how annual average air temperatures have changed in different parts of the United States since the early twentyth century (since 1901 for the face-to-face 48 states and 1925 for Alaska). The data are shown for climate divisions, as divers by the National Oceanic and Atmospheric Administration.
Data source: NOAA, 20213
Web update: April 2021
Key Points
- Since 1901, the average surface temperature across the contiguous 48 states has risen at an average rate of 0.16°F per decade (meet Figure 1). Average temperatures accept risen more than quickly since the late 1970s (0.31 to 0.54°F per decade since 1979). Viii of the top 10 warmest years on tape for the face-to-face 48 states take occurred since 1998, and 2012 and 2016 were the two warmest years on record.
- Worldwide, 2016 was the warmest twelvemonth on record, 2020 was the 2nd-warmest, and 2011–2020 was the warmest decade on tape since thermometer-based observations began. Global average surface temperature has risen at an average rate of 0.17°F per decade since 1901 (run into Figure 2), like to the rate of warming within the contiguous 48 states. Since the late 1970s, however, the Us has warmed faster than the global rate.
- Some parts of the United states have experienced more warming than others (run into Figure 3). The Due north, the West, and Alaska have seen temperatures increase the most, while some parts of the Southeast have experienced little change. Not all of these regional trends are statistically significant, yet.
Background
Temperature is a fundamental measurement for describing the climate, and the temperature in particular places tin can take wide-ranging effects on human life and ecosystems. For example, increases in air temperature tin can lead to more than intense heat waves (see the Rut Waves indicator), which tin cause affliction and expiry, especially in vulnerable populations. Annual and seasonal temperature patterns also decide the types of animals and plants that can survive in particular locations. Changes in temperature can disrupt a wide range of natural processes, particularly if these changes occur more quickly than plant and animal species can conform.
Concentrations of heat-trapping greenhouse gases are increasing in the Earth's temper (run into the Atmospheric Concentrations of Greenhouse Gases indicator). In response, boilerplate temperatures at the Earth's surface are increasing and are expected to continue ascent. Because climate change tin can shift the wind patterns and ocean currents that drive the world'due south climate organization, some areas are warming more than than others, and some have experienced cooling.
About the Indicator
This indicator examines U.S. and global surface temperature patterns over time. U.S. surface measurements come from weather condition stations on country, while global surface measurements also comprise observations from buoys and ships on the body of water, thereby providing information from sites spanning much of the surface of the Globe. This indicator starts at 1901 except for the detailed map of Alaska, where reliable statewide records are available back to 1925. For comparing, this indicator also displays satellite measurements that tin can be used to estimate the temperature of the Globe's lower atmosphere since 1979.
This indicator shows annual anomalies, or differences, compared with the average temperature from 1901 to 2000. For case, an anomaly of +two.0 degrees ways the average temperature was 2 degrees college than the long-term boilerplate. Anomalies accept been calculated for each weather station. Daily temperature measurements at each site were used to calculate monthly anomalies, which were then averaged to find an annual temperature bibelot for each yr. Anomalies for the contiguous 48 states and Alaska accept been determined past calculating boilerplate anomalies for areas within each country based on station density, interpolation, and topography. These regional anomalies are and so averaged together in proportion to their area to develop national results. Similarly, global anomalies accept been determined past dividing the world into a grid, averaging the data for each prison cell of the grid, and and then averaging the grid cells together.
About the Information
Indicator Notes
Information from the early twentyth century are somewhat less precise than more contempo information because there were fewer stations collecting measurements at the time, especially in the Southern Hemisphere. The overall trends are nevertheless reliable, yet. Where possible, the data have been adjusted to account for whatever biases that might be introduced by factors such as station moves, urbanization near the station, changes in measuring instruments, and changes in the verbal times at which measurements are taken.
Hawaii and U.S. territories are not included, due to limitations in available information.
Data Sources
The data for this indicator were provided by the National Oceanic and Atmospheric Assistants's National Centers for Ecology Information, which maintains a large collection of climate information online at: www.ncei.noaa.gov. The surface temperature anomalies shown here were calculated based on monthly values from a network of long-term monitoring stations. Satellite data were analyzed past ii independent groups—the Global Hydrology and Climate Middle at the University of Alabama in Huntsville (UAH) and Remote Sensing Systems (RSS)—resulting in slightly dissimilar trend lines.
Technical Documentation
- Download related technical data PDF
References
1 USGCRP (U.S. Global Change Research Program). 2017. Climate scientific discipline special study: Fourth National Climate Assessment, book I. Wuebbles, D.J., D.W. Fahey, K.A. Hibbard, D.J. Dokken, B.C. Stewart, and T.Yard. Maycock (eds.). https://science2017.globalchange.gov. doi:ten.7930/J0J964J6.
two NOAA (National Oceanic and Atmospheric Administration). 2021. Climate at a glance. Accessed February 2021. world wide web.ncdc.noaa.gov/cag.
3 NOAA (National Oceanic and Atmospheric Administration). 2021. Climate at a glance. Accessed February 2021. world wide web.ncdc.noaa.gov/cag.
four NOAA (National Oceanic and Atmospheric Administration). 2021. Climate at a glance. Accessed Feb 2021. www.ncdc.noaa.gov/cag.
Source: https://www.epa.gov/climate-indicators/climate-change-indicators-us-and-global-temperature
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