METAR Information for KMMO (74460) in Marseilles Island, IL, United States

The following information is known about KMMO. If you think that any information is incorrect, then please follow the instructions for correcting that data item.

It is possible that this page will report a problem where no problem exists. If you believe that this has happened, then please contact me (address at the bottom of this page) and explain clearly why you think this page is in error. Note that any changes that you make may take a few days to show up here, so please give it a week before commenting.

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Registered Location

Latitude: 41° 22' 0" N (deg min sec), 41.3667° (decimal), 4122.00N (LORAN)
Longitude: 88° 41' 0" W (deg min sec), -88.6833° (decimal), 08841.00W (LORAN)
Elevation: 225 metres (738 feet) -- validated against 224 metres (734 feet) from NED Contiguous U. S. 1/3E arc second elevation data
WMO Id: 74460
Location: Marseilles Island, IL, United States
County: La Salle, IL
Forecast Office: Chicago (LOT)

The site coordinates appear to be of low precision, and the station may be anywhere within the marked area. Clicking within the map area (or you can drag the 'KMMO' marker) will display the latitude/longitude of that point.

If the displayed location (or elevation) of the weather observing location is incorrect, please drag the marker to the right location (or click in the right location), and then send the updated information. Please note that we are trying to spot either the Stevenson Screen (or equivalent) or the location where the barometric readings are taken.

The location information for this site was gathered from 10 data sources. The source which most closely matches the consensus is chosen. Many of these sources only report the location to the nearest minute (or hundredth of degree). This can lead to the marker being placed noticeably incorrectly. Please see Discussion of Location Errors for more information. Show location history.

There are no photographs of the station. If you have pictures of this location, then please email them to

You can try to find photographs from the area surrounding the site marker by clicking on Find nearby photographs.

Neighboring Stations

This is a list of stations that are close to this station.

You can also subscribe to an RSS feed to tell you when new stations come online in this area. Choose either within 100 miles or 250 miles . For stations covered by your Forecast Office: Chicago (LOT) .

K8N26.2 milesWest Ottawa Skydive Chicago, IL, United States of America (lat 41.3998°, long -88.7939°, altitude 187 metres)
KC0914.6 milesEast Morris, Morris Municipal-James R Washburn Field Airport, IL, United States (lat 41.4316°, long -88.4152°, altitude 178 metres) (data present)
FW287417.0 milesWest Utica, IL, US (lat 41.3735°, long -89.0117°, altitude 189 metres) (data present)
DW967218.6 milesSouthwest Streator, IL, US (lat 41.1285°, long -88.8505°, altitude 173 metres) (data present)
KC9DNQ-320.1 milesEast Coal City, IL, US (lat 41.3417°, long -88.2978°, altitude 160 metres) (data present)
EW786821.9 milesEast Channahon, IL, US (lat 41.4153°, long -88.2662°, altitude 610 metres) (data present)
UP79123.5 milesSoutheast Maznia, IL, United States Of America (lat 41.2070°, long -88.2841°, altitude 175 metres) (data present)
EW586623.6 milesSoutheast Dwight, IL, US (lat 41.0857°, long -88.4253°, altitude 194 metres) (data present)
KVYS24.2 milesWest Peru, Illinois Valley Regional-Walter A Duncan Field Airport, IL, United States (lat 41.3518°, long -89.1496°, altitude 199 metres) (data present)
UP79825.6 milesSouth Odell, IL, United States Of America (lat 41.0200°, long -88.5093°, altitude 213 metres) (data present)

The sites marked above thus did not report continuously during the analysis period, so the offsets may (probably will) not be accurate.

Location Formats

The location is shown in three different formats. Each of these is used in some software, and is shown on some websites.

Degrees Minutes Seconds: VWS/VWSAPRS, WeatherLink 5.5, WeatherLink (5.2-5.4), WeatherView (Linux)

Decimal degrees: FreeWX, WeatherView32 (PC application)

LORAN: WeatherDisplay, WUHU, Henriksen WServer


CWOP Home: This describes the whole CWOP program and has a large amount of useful information.

CWOP Siting Guide (PDF): This is a guide to siting and operating a CWOP station. This is a must-read document.

Another CWOP Guide (PDF): This is another guide to siting and operating a CWOP station. This is a must-read document.

Urban Siting and Operations (PDF): This is a guide to siting and operating a CWOP station in an urban environment.

APRS WX Message format: This describes the actual format of the messages transmitted that carry WX information.

WXQC Mailing List: This is a mailing list where data quality issues are discussed. Assistance with software configuration can often be found here.

Topo Map Reading Guide: How to read USGS topographic maps, with a good section on reading contours.

Geographically nearby web pages: Use Geourl to find web pages that deal with locations geographically close to this site.

Overall website comments, problems etc to Philip Gladstone
Page layout last modified Sunday, 28 February 2016
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