NonFedAWOS Information for PHJH (JHM) in Lahaina / West Maui, HI, United States

The following information is known about PHJH. 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: 20° 57' 47" N (deg min sec), 20.9631° (decimal), 2057.78N (LORAN)
Longitude: 156° 40' 29" W (deg min sec), -156.6747° (decimal), 15640.48W (LORAN)
Elevation: 78 metres (256 feet) -- validated against 64 metres (212 feet) from NED 1/3rd arc-second: Hawaii
Location: Lahaina / West Maui, HI, United States
County: Maui, HI
Data provider: SAI
County warning area: HFO
Observing program(s): COOP

The site location should be at the mark shown -- or very close. Clicking within the map area (or you can drag the 'PHJH' 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.

Can you help with location quality? Please indicate if the marker on the map points at the weather instrument cluster:

The location information for this site was gathered from 14 data sources. This position has been modified based on user feedback. The user provided this information: Minor adjustment to the marker. New photos have been uploaded to Flickr. Once they re-index the entries you should be able to find them by searching the tags.

Show location history.

The station (or view from the station) is shown here. You can choose the view direction to see the surroundings. Other information (and somewhat larger images) can be found by clicking on the picture.

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

Data Status

Data has been seen on each of the last 27 analyzed days.

Recent observations from this weather station can be downloaded as a CSV file suitable for importing into various spreadsheet programs: last 7 days, last 14 days, last 28 days, last 56 days. This data can also be linked directly from Excel using a Web Query. The main link goes to the page with the data on it, and the IQY link is the Web Query that will access it: last 7 days (IQY: last 7 days), last 14 days (IQY: last 14 days), last 28 days (IQY: last 28 days), last 56 days (IQY: last 56 days).

All the means and standard deviations shown below are from the last 28 days. Change analysis period to Last 3 days  Last 7 days  Last 14 days  Last 8 weeks  Last 13 weeks  Last 26 weeks  Last 39 weeks  Last 52 weeks  

A recently received weather report from this station was


Latest daily graph:

Latest daily graph


Latest daily graph:

Latest daily graph

Dewpoint -- or switch to Relative Humidity

Latest daily graph:

Latest daily graph

Wind Vector

The wind vector is the average wind over the relevant period. Note that if the wind blows North for half the time at 2 knots, and then blows South for the other half of the time at 2 knots, then the result is zero -- i.e. North wind and South wind will cancel out.
TodayLast 7 days
Wind vector chartWind vector chart for last 7 days

Neighboring Stations

This is a list of stations that are close to this station. You can look at those for comparison purposes. The average difference between your station and each station below is listed as well. This may allow you to detect local stations which are erroneous. You can also use these numbers to adjust your instruments -- especially if a number of ASOS stations have similar differences to your station. Also, try increasing the analysis period to more than the default 28 days. The difference is only given if both stations report reasonably often during each day. Some stations only report every 6 hours, and this makes the average of less interest. In this case, the average is not displayed. The values reported are the differences between this station and the neighboring station. I.e. if the difference is positive, then this station is reading higher than the neighboring 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 in your County Warning Area: HFO .

EW54558.1 milesSouth Lahaina, HI, US (lat 20.8525°, long -156.6327°, altitude 229 metres) 0.8mb1.4°F1.3°F
PHOG16.4 milesEast KAHULUI AIRPORT, HI, United States (lat 20.8986°, long -156.4305°, altitude 15 metres) 0.2mb2.7°F-2.4°F
PHNY21.7 milesSouthwest Lanai City, Lanai Airport, HI, United States (lat 20.7856°, long -156.9514°, altitude 399 metres) -1.8mb0.7°F1.0°F
PHMK30.2 milesNorthwest Kaunakakai, Molokai Airport, HI, United States (lat 21.1529°, long -157.0963°, altitude 137 metres) -0.5mb-0.0°F-1.1°F
PHNG77.9 milesNorthwest MCBH KANEOHE BAY HAWAII, HI, United States (lat 21.4509°, long -157.7629°, altitude 7 metres) 0.1mb2.3°F-4.0°F
PHIK85.5 milesWest Hickam Air Force Base / Oahu , HI, United States (lat 21.3500°, long -157.9333°, altitude 5 metres)
PHNL85.6 milesWest HONOLULU INTERNATIONAL AIRPORT , HI, United States (lat 21.3275°, long -157.9431°, altitude 5 metres) -0.1mb1.0°F0.4°F
PHJR93.1 milesWest KALAELOA AIRPORT, HI, United States (lat 21.3074°, long -158.0703°, altitude 15 metres) -0.5mb1.7°F0.1°F
PHKO94.0 milesSoutheast KONA INTERNATIONAL AIRPORT, HI, United States (lat 19.7388°, long -156.0456°, altitude 13 metres) 1.5mb1.0°F-0.3°F
PHHI95.2 milesWest Wheeler Air Force Base / Oahu, HI, United States (lat 21.4776°, long -158.0443°, altitude 255 metres) -0.9mb2.3°F-0.1°F

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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