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Temperature: Decadal Averages Map

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12km x 12km pixel grid
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legend
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Map Controls
Use these buttons to control the map.
Zoom to the full extent of California
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Change the opacity of the overlay
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Map Animation
Use these buttons to watch the map overlay reflect temperature averages over time.
  • Click the Play button to begin the animation.
  • Click the Toggle button to alternate between the beginning and end of the available years. The beginning year displays temperature averages projected into the past, and the end year displays temperature averages projected into the future.
  • Use the Slider to control the speed of the animation.
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Timeline
The timeline displays which decade you are currently viewing on the map. You can manually drag the handle to change the year in view.
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Map Legend
The Legend displays the range of values visible on the map overlay for the variable being displayed (temperature degrees, inches of rainfall, area burned, etc).
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Map Magnifier
Click the toggle button on the bottom left corner of the map to view a magnified map. You can drag the magnified map or the magnifying glass on the larger map to explore the region.
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Tool Charts
Click anywhere on the map to see a chart for this area.

Using the Area Selection Type Menu to the left, edit types of selection areas:

  • grid cells, where each cell is an area of 12km x 12km
  • predefined county boundaries

Then click anywhere on the map to automatically change the area described in the chart.

Select various chart options in the dropdown menus to the right, which can include Month, Model, and Temperature ranges (High, Low, or Average).

Note: The first set of chart options control the variables being viewed on the map.

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Add a Chart for comparison

Click "Add Chart" to create an additional chart to compare with. After creating the new chart, click on a new area of the map to view a chart for the same options in another location. Or change an option in the dropdown menu to view the chart for the same location, with different settings.

To edit the first chart again, either directly edit the dropdown menus, or click on the Location Name and then click on a new location on the map.

Click "Predefined boundaries" in the Area Selection Type Menu to the left before clicking on an area of the map, if you'd like to compare counties to one another.

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Lock Location

Fix the locations of the graphs to one area by clicking this toggle.

Elevation:
Month:
Model:
H|L|Avg:

Temperature

Overall temperatures are expected to rise substantially throughout this century. During the next few decades, scenarios project average temperature to rise between 1 and 2.3°F; however, the projected temperature increases begin to diverge at mid-century so that, by the end of the century, the temperature increases projected in the higher emissions scenario (A2) are approximately twice as high as those projected in the lower emissions scenario (B1).

These projections also differ depending on the time of year and the type of measurement (high's vs. lows), all of which have different potential effects to the state's ecosystem health, agricultural production, water use and availability, and energy demand.

Use the slider bar to the left to visualize the projected rise in temperature, as seen in the low and higher emissions scenarios. Adjust the options below to view different models, months, and lows vs. highs.

Take a Tour

Emissions Scenario:

Create a chart by clicking a location on the map and altering one of the dropdown option boxes.

Elevation:
Month:
Model:
H|L|Avg:

Create a chart by clicking a location on the map and altering one of the dropdown option boxes.

Uncertainty

The data presented in this tool represent a projection of potential future climate scenarios, they are not predictions. These data are meant to illustrate how the climate may change based on a variety of different potential social and economic factors. The default visualizations in this tool are comprised of the average values from a variety of scenarios and models. Find out more about climate change data.

Disclaimer

This information is being made available for informational purposes only. Users of this information agree by their use to hold blameless the State of California, and its respective officers, employees, agents, contractors, and subcontractors for any liability associated with its use in any form.

This work shall not be used to assess actual coastal hazards, insurance requirements, or property values and specifically shall not be used in lieu of Flood Insurance Studies and Flood Insurance Rate Maps issued by the Federal Emergency Management Agency (FEMA).

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Temperature: Decadal Averages Map

Climate data provided by:

California Nevada Applications Program (CNAP) logo

Scripps Institution of Oceanography

California Nevada Applications Program (CNAP)

Data Set Contributed: Projected Monthly Temperature

Projected monthly temperature data for tmax (high), tair (avg), and tmin (low). These data layers were downscaled using a bias correction and spatial downscaling (BCSD) approach and include data for four different models (PCM1, CCSM3, GFDL, CNRM) for two different scenarios (A2, B1).

For more information, view the full CEC report:
Climate Change Scenarios and Sea Level Rise Estimates for California - 2008 Climate Change Scenarios Assessment - Final Report
Date Published: September 2009

Related Stories

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Wine Industry

2011 April 12

California is the nation’s largest wine producer and the fourth largest wine producer worldwide. High-quality wines produced throughout the Napa and Sonoma Valleys and along the northern and central coasts generate $3.2 billion in revenue each year. High temperatures during the growing season can cause premature ripening and reduce grape quality. Temperature increases are expected to have only modest effect on grape quality in most regions over the next few decades. However, toward the end of the century, wine grapes could ripen as much as one to two months earlier, which will affect grape quality in all but the coolest coastal locations (Mendocino and Monterey Counties).

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Intensification of Heat Waves

2011 April 13

By 2100, if temperatures rise to the higher warming range, there could be up to 100 more days per year with temperatures above 90°F in Los Angeles and above 95°F in Sacramento. As  temperatures rise, Californians could face greater risk of death  from dehydration, heat stroke/exhaustion, heart attack, stroke, and respiratory distress caused by extreme heat. By mid century, extreme heat events in urban  centers such as Sacramento, Los Angeles, and San Bernardino could cause two to three times more heat-related deaths than occur today.

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Rising Temperatures in Agriculture

2011 April 12

The agriculture industry of California is the largest and the most diverse of the country, producing 300 commodities and half of the country’s fruits and vegetables. As temperatures rise in the state, there will be a direct impact on the water supply, proliferation of pests, outbreak of diseases and overall quality and quantity of the produce.

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