Weather App For PC Archives

1. ASOS Network
2. ASOS-AWOS-METAR Data Download

The IEM maintains an ever growing archive of automated airport weather observations from around the world! These observations are typically called 'ASOS' or sometimes 'AWOS' sensors. A more generic term may be METAR data, which is a term that describes the format the data is transmitted as. If you don't get data for a request, please feel free to contact us for help. The IEM also has a one minute interval dataset for Iowa ASOS (2000-) and AWOS (1995-2011) sites. This archive simply provides the as-is collection of historical observations, very little quality control is done. "M" is used to denote missing data.

Here is a python script example that automates the download of data from this interface. A community user has contributed R language version of the python script.

Download Variable Description
ASOS User's Guide has detailed information about these data variables. The value "M" represents either value that was reported as missing or a value that was set to missing after meeting some general quality control check, or a value that was never reported by the sensor. The METAR format makes it difficult to determine which of the three cases may have happened.

station:

three or four character site identifier

valid:

timestamp of the observation

tmpf:

Air Temperature in Fahrenheit, typically @ 2 meters

dwpf:

Dew Point Temperature in Fahrenheit, typically @ 2 meters

relh:

Relative Humidity in %

drct:

Wind Direction in degrees from north

sknt:

Wind Speed in knots

p01i:

One hour precipitation for the period from the observation time to the time of the previous hourly precipitation reset. This varies slightly by site. Values are in inches. This value may or may not contain frozen precipitation melted by some device on the sensor or estimated by some other means. Unfortunately, we do not know of an authoritative database denoting which station has which sensor.

alti:

Pressure altimeter in inches

mslp:

Sea Level Pressure in millibar

vsby:

Visibility in miles

gust:

Wind Gust in knots

skyc1:

Sky Level 1 Coverage

skyc2:

Sky Level 2 Coverage

skyc3:

Sky Level 3 Coverage

skyc4:

Sky Level 4 Coverage

skyl1:

Sky Level 1 Altitude in feet

skyl2:

Sky Level 2 Altitude in feet

skyl3:

Sky Level 3 Altitude in feet

skyl4:

Sky Level 4 Altitude in feet

wxcodes:

Present Weather Codes (space seperated)

feel:

Apparent Temperature (Wind Chill or Heat Index) in Fahrenheit

ice_accretion_1hr:

Ice Accretion over 1 Hour (inches)

ice_accretion_3hr:

Ice Accretion over 3 Hours (inches)

ice_accretion_6hr:

Ice Accretion over 6 Hours (inches)

peak_wind_gust:

Peak Wind Gust (from PK WND METAR remark) (knots)

peak_wind_drct:

Peak Wind Gust Direction (from PK WND METAR remark) (deg)

peak_wind_time:

Peak Wind Gust Time (from PK WND METAR remark)

metar:

unprocessed reported observation in METAR format

Note: You must unplug your WeatherLink USB data logger from the USB port on your PC before you install this upgrade.

Version History

What’s new in v6.0.3

1. Fixed installation error with Windows 8. Updated .net to 3.5 and replaced the 2.0 version for compatibility to Win8.

What’s new in v6.0.2

1. Fixed a bug that prevented the user from uploading data to WeatherLink.com using the “Network Subscription” service.

What’s new in v6.0.1

1. Software will rotate through available CWOP/APRS servers until CWOP upload is successful.
2. Fixed header mis-alignment on Summary page.
3. Humidity now displays correctly on weatherlink.com when using a Monitor II and a WeatherLink Network Annual Subscription
4. Calibration numbers are now uploaded to weatherlink.com when using a Monitor II and a WeatherLink Network Annual Subscription
5. Fixed intermittent error when web downloading.
6. Corrected a typo on error screen when entering a daily ET alarm greater than 2.54 inches.

Required: WeatherLink data logger (6510C, 6510SER, 6510USB, 6540, 6544, 6550, 6560, 6555, or 7862).

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