Caltrans GIS Data


California Automated Weather Observation Systems Locations

This point feature class represents California’s Automated Weather Observation System locations for aviation.

Data Created: September 16, 2013
Last Modified: February 23, 2016


This layer was created from the California Aviation System Plan (2013) list of Automated Weather Observation Systems. The upgrades and distribution of Automated Weather Observing Systems (AWOS) Automated Surface Observation Systems (ASOS), and Automated Terminal Information Services (ATIS) in California are a critical part of the State aviation system. Access to localized weather conditions benefit both commercial and General Aviation (GA) operations. Caltrans Division of Aeronautics (Division) is monitoring the expansion and updating of the system with a focus on bringing more of this technology to key airports thereby improving air safety. Also, as AWOS/ASOS technology improves, the use of the hardware for shared uses, such as monitoring remote highways concurrently with remote airports is seen as an essential safety measure for normal as well as emergency response operations. The State is currently researching a cooperative approach to improving the road and aviation automated weather reporting system to support multimodal safety statewide. The expansion of the system through Public Private Partnerships (P3) is also becoming a topic of increasing interest as data and cost sharing strategies among various users becomes more desired, available and practical.

Use limitations

This data is provided as a service for planning purposes and not intended for design, navigation purposes or airspace consideration. Such needs should include discussions with the Federal Aviation Administration, Caltrans Division of Aeronautics, and the site management/owners.


The maps and data are made available to the public solely for informational purposes. Information provided in the Caltrans GIS Data Library is accurate to the best of our knowledge and is subject to change on a regular basis, without notice. While the GIS Data Management Branch makes every effort to provide useful and accurate information, we do not warrant the information to be authoritative, complete, factual, or timely. Information is provided on an "as is" and an "as available" basis. The Department of Transportation is not liable to any party for any cost or damages, including any direct, indirect, special, incidental, or consequential damages, arising out of or in connection with the access or use of, or the inability to access or use, the Site or any of the Materials or Services described herein.


Tags: Aviation, Airport, Weather, Observation, AWOS, ASOS, ATIS, California
Credits: California Department of Transportation, Division of Aeronautics
File: Zipped shapefile: , size 0.022 MB
Extent: California statewide
References: California Aviation System Plan (CASP) Elements: