1. ASOS Mainpage
2. Download ASOS 1 minute interval data

Each month, the National Climatic Data Center provides an archive of one minute interval data from the ASOS sites in the United States. Unfortunately, the data format of this information is brutal to work with. Fortunately for you, the IEM processes this information and provides it for download here. The archive is available up until: 29 Oct 2024. There is a different interface to download the routine hourly observations from this network and for sites over the entire globe.

Backend Documentation exists for those that wish to script against this service.

1. Select Station:

Select One or More or All stations in the network.

2. Timezone of Observations:

The timestamps used in the downloaded files will be set in the timezone you specify. UTC Time Eastern Time Central Time Mountain Time Pacific Time Alaska/Anchorage Time

3. Select Start/End Time:

This timestamp is in the timezone you selected above.

	Year	Month	Day	Hour	Minute
Start:	2000200120022003200420052006200720082009201020112012201320142015201620172018201920202021202220232024	JanFebMarAprMayJunJulAugSepOctNovDec	12345678910111213141516171819202122232425262728293031	12 AM01 AM02 AM03 AM04 AM05 AM06 AM07 AM08 AM09 AM10 AM11 AM12 PM01 PM02 PM03 PM04 PM05 PM06 PM07 PM08 PM09 PM10 PM11 PM	01234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859
End:	2000200120022003200420052006200720082009201020112012201320142015201620172018201920202021202220232024	JanFebMarAprMayJunJulAugSepOctNovDec	12345678910111213141516171819202122232425262728293031	12 AM01 AM02 AM03 AM04 AM05 AM06 AM07 AM08 AM09 AM10 AM11 AM12 PM01 PM02 PM03 PM04 PM05 PM06 PM07 PM08 PM09 PM10 PM11 PM	01234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859

4. Select Variables:

Air Temperature [F] Dew Point Temperature [F] Wind Speed [knots] Wind Direction 5 sec gust Wind Direction 5 sec gust Wind Speed [knots] Visibility 1 Coefficient Visibility 1 Night/Day Visibility 2 Coefficient Visibility 2 Night/Day Visibility 3 Coefficient Visibility 3 Night/Day Precip Type Code 1 minute precip [inches] Sensor 1 Station Pressure [inches] Sensor 2 Station Pressure [inches] Sensor 3 Station Pressure [inches]

5. Data Sampling?

Data is potentially available every minute, but you don't have to download it at that frequency. This setting does not bin the values, but rather filters based on your interval of choice. Every Minute Every 5 Minutes Every 10 Minutes Every 20 Minutes Every Hour

6. How to view?

The "Plot in Chart" option was removed here due to its poor performance. Please try Autoplot 211 instead.

Download to Disk View on-line

7. Data Delimitation:

How shall the output values be seperated?
Comma Tab

8. Include Station Latitude & Longitude values?

No Yes

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