Meteorological Files

This page updated October 5, 2015


The processed hourly meteorological data are available from the Air Quality Planning and Science Division of the California Air Resources Board. The ASCII data are in the format specified by AERMOD for standard ASCII input.

The US-EPA Guideline on Air Quality Models recommend that the most recent five years of consecutive meteorological data should be used for air quality modeling studies. The OEHHA Air Toxics Hot Spots Program Guidance Manual for the Preparation of Risk Assessments recommend that the most recent five years of consecutive meteorological data should be used for risk assessment analysis. A single year may be used if it is the most conservative year.

These data are made available for your convenience. We will update these data on an "as needed" basis. This means where we have a specific application to include additional processed data for individual projects, the data will also be available at this location.


These meteorological data should be only used in the AERMOD model. These data are from NOAA's National Climatic Data Center (NCDC) and have been processed with AERMET Version 14134. They are the five years data sets from 1/1/2009 to 1/2/2014 and are from 114 airport meteorological stations. Table below lists the airport meteorological stations and districts each station located in. You may download the meteorological stations and air distrcits overlayed KMZ file, then open it in Google Earth or other geographic browsers to see the locations of the meteorological stations and air districts and to determine what the meteorological files you need to download for your project. You can download a compressed met file of a station by clicking on the balloon of the station in the map or on the station's name in the table below. A compressed file name is the station's ID. You will need an unzip program (like PKUNZIP or WinZip) to uncompress the data.

San Joaquin Valley Unified Air Pollution Control District,Santa Barbara County Air Pollution Control District, and South Coast Air Quality Manamement District have requested to use the AERMOD ready meteorological data processed by their districts instead of the airport met data. Please go to the district meteorological data section to download their AERMOD ready meteorological data for your project.

Please download the readme file for information as how the meteorological data is prepared. Mojave Desert AQMD has requested to process the meteorological data using the upper air data from the representative upper air sites other than the nearest upper air sites for surface sites in Mojave Desert AQMD (except BICYCLE LAKE AAF) and CHINA LAKE site in Kern County APCD. The zipped met file for CHINA LAKE site has the meteorological data sets using both the nearest upper air site (for projects in Kern County APCD) and the representative sites (for projects in Mojave Desert AQMD) respectively. Please read the readme file for detailed information.

If the representative meteorological data necessary for your AERMOD run is not available, you may want to create the screening meteorological data to perform a screening analysis using US EPA’s AERSCREEN model. The data for AERSCREEN are made available for your convenience. You may go to the AERSCREEN meteorological data web page to download the files you need.

For your reference, we have archived the ISCST3 meteorological file web page.

Please email questions regarding the files to HARP.


Standard CARB Disclaimer

The fact that the California Air Resources Board (CARB) has supplied you with these data does not mean that the CARB will place its approval on subsequent applications. These data should not be used for other programs without approval from the reviewing agencies. We must emphasize that the models must be applied properly with appropriate input data which is consistent with their formulation, testing, and assumptions.


Meteorological Data from Air Districts

You may obtain meteorological data from San Joaquin Valley Unified Air Pollution Control District.

You may obtain meteorological data from Santa Barbara County Air Pollution Control District.

You may obtain meteorological data from South Coast Air Quality Manamement District.

Individual Station Files
5-Year Data Set from 1/1/2009 to 1/2/2014*
STATION NAME AIR DISTRICT LATITUDE LONGITUDE ELEVATION (M)
GENERAL WILLIAM J. FOX AIRFIELD AIRPORT Antelope Valley AQMD 34.741 -118.212 712.6
PDLE PRODN FLT/TST AF PLT Antelope Valley AQMD 34.629 -118.084 769.2
SANDBERG Antelope Valley AQMD 34.744 -118.724 1374.7
GNOSS FIELD AIRPORT Bay Area AQMD 38.15 -122.55 0.6
NALF/F. SHERMAN FLD ARPT Bay Area AQMD 33.023 -118.588 55.5
LIVERMORE MUNICIPAL ARPT Bay Area AQMD 37.693 -121.814 119.8
METRO OAKLAND INTL AIRPORT Bay Area AQMD 37.721 -122.221 1.8
PALO ALTO AIRPORT OF SANTA CLARA COUNTY Bay Area AQMD 37.467 -122.117 2.1
SAN CARLOS AIRPORT Bay Area AQMD 37.517 -122.25 1.5
SAN FRANCISCO INTERNATIONAL AIRPORT Bay Area AQMD 37.62 -122.365 2.4
N Y. MINETA SN JO INTL APT Bay Area AQMD 37.359 -121.924 15.5
REID-HILLVIEW AIRPORT OF SANTA CLARA COUNTY Bay Area AQMD 37.333 -121.817 40.5
NAPA COUNTY AIRPORT Bay Area AQMD 38.21 -122.285 4.3
SONOMA COUNTY AIRPORT Bay Area AQMD 38.504 -122.81 34.8
MOFFETT FEDERAL AIRFLD APT Bay Area AQMD 37.406 -122.048 11.9
TRAVIS AIR FORCE BASE Bay Area AQMD 38.267 -121.933 18.9
CHICO MUNICIPAL AIRPORT Butte County AQMD 39.8 -121.85 82.9
OROVILLE MUNICIPAL AIRPORT Butte County AQMD 39.49 -121.618 57.9
LAKE TAHOE AIRPORT El Dorado County APCD 38.898 -119.995 1924.5
BEALE AIR FORCE BASE Feather River AQMD 39.133 -121.433 34.4
YUBA COUNTRY AIRPORT Feather River AQMD 39.102 -121.568 18.9
MAMMOTH YOSEMITE AIRPORT Great Basin Unified APCD 37.633 -118.85 2172.6
BISHOP AIRPORT Great Basin Unified APCD 37.371 -118.358 1250.3
NAF Imperial County APCD 32.817 -115.683 -12.8
IMPERIAL COUNTY AIRPORT Imperial County APCD 32.834 -115.579 -17.7
MOJAVE AIRPORT Kern County APCD 35.067 -118.15 849.5
EDWARDS AF AUX NORTH Kern County APCD 34.988 -117.865 694.3
EDWARDS AIR FORCE BASE Kern County APCD 34.9 -117.867 704.4
*CHINA LAKE Kern County APCD 35.688 -117.693 679.7
TEHACHAPI MUNI Kern County APCD 35.135 -118.439 1219.5
UKIAH MUNICIPAL AIRPORT Mendocino County AQMD 39.126 -123.201 183.2
ALTURAS MUNICIPAL AIRPORT MODOC County APCD 41.491 -120.564 1333.5
*BARSTOW-DAGGETT AIRPORT Mojave Desert AQMD 34.854 -116.786 584.3
BICYCLE LAKE AAF Mojave Desert AQMD 35.281 -116.63 716.3
*BLYTHE AIRPORT Mojave Desert AQMD 33.619 -114.714 120.4
*NEEDLES AIRPORT Mojave Desert AQMD 34.768 -114.619 271.3
*SOUTHERN CALIFORNIA LOGISTICS AIRPORT Mojave Desert AQMD 34.583 -117.383 879.4
*TWENTY NINE PALMS Mojave Desert AQMD 34.3 -116.167 625.1
MONTEREY PENINSULA AIRPORT Monterey Bay Unified APCD 36.588 -121.845 50.3
***HOLLISTER MUNI Monterey Bay Unified APCD 36.9 -121.417 70.1
**WATSONVILLE MUNICIPAL ARPT Monterey Bay Unified APCD 36.936 -121.789 48.8
WOODLEY ISLAND (NEW 10/94) North Coast Unified APCD 40.81 -124.16 6.1
ARCATA AIRPORT North Coast Unified APCD 40.978 -124.109 61
JACK MCNAMARA FIELD ARPT North Coast Unified APCD 41.78 -124.237 17.4
TRUCKEE-TAHOE AIRPORT Northern Sierra AQMD 39.32 -120.139 1798.3
AUBURN MUNICIPAL AIRPORT Placer County APCD 38.955 -121.082 466.7
BLUE CANYON - NYACK ARPT Placer County APCD 39.277 -120.71 1608.1
SACRAMENTO EXECUTIVE AIRPORT Sacramento Metropolian AQMD 38.507 -121.495 4.6
SACRAMENTO MATHER AIRPORT Sacramento Metropolian AQMD 38.567 -121.3 30.2
SACRAMENTO INTL AIRPORT Sacramento Metropolian AQMD 38.696 -121.59 7
SAN DIEGO INTERNATIONAL AIRPORT San Diego County APCD 32.734 -117.183 4.6
MONTGOMERY FIELD AIRPORT San Diego County APCD 32.816 -117.139 127.1
BROWN FIELD MUNICIPAL ARPT San Diego County APCD 32.572 -116.979 157
NORTH ISLAND NAS San Diego County APCD 32.7 -117.2 7.9
GILLESPIE FIELD AIRPORT San Diego County APCD 32.826 -116.973 118
NAVAL AUXILIARY LANDING FD San Diego County APCD 32.567 -117.117 7.3
MARINE CORPS AIR STATION San Diego County APCD 33.3 -117.35 22.9
MCCLELLAN-PALOMAR AIRPORT San Diego County APCD 33.128 -117.279 100
MCOLF CAMP PENDLETON (RED BEACH) AIRPORT San Diego County APCD 33.286 -117.456 27
MARINE CORPS AIR STATION San Diego County APCD 32.867 -117.133 145.4
OCEANSIDE MUNICIPAL ARPT San Diego County APCD 33.219 -117.349 8.5
RAMONA AIRPORT San Diego County APCD 33.038 -116.916 424.6
CAMPO San Diego County APCD 32.623 -116.473 801.6
SAN LUIS CO REGIONAL ARPT San Luis Obispo County APCD 35.237 -120.641 61
PASO ROBLES MUNICIPAL ARPT San Luis Obispo County APCD 35.67 -120.628 246.9
REDDING MUNICIPAL AIRPORT Shasta County AQMD 40.518 -122.299 151.5
SISKIYOU COUNTY AIRPORT Siskiyou County APCD 41.781 -122.468 808
MOUNT SHASTA Siskiyou County APCD 41.333 -122.333 1077.5
RED BLUFF MUNICIPAL ARPT Tahama County APCD 40.152 -122.254 107.6
POINT MUGU Ventura County APCD 34.117 -119.117 4
CAMARILLO AIRPORT Ventura County APCD 34.217 -119.083 23.5
OXNARD AIRPORT Ventura County APCD 34.201 -119.207 11
DAVIS Yolo/Solano AQMD 38.533 -121.783 21
NUT TREE AIRPORT Yolo/Solano AQMD 38.378 -121.958 33.2

* Upper air data is not from the nearest site but the representative site(s) as Mojave Desert AQMD requested. The zipped met file for CHINA LAKE has meteorological data sets using the upper air data from both the nearest upper air site (for projects in Kern County APCD) and the representative upper air sites (for projects in Mojave Desert AQMD) respectively. Please read the readme file for detailed information.

** Surface parameters are not based on AERSURFACE due to data availability.

*** Missing surface data for January 2009.

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