IEM :: Download Hourly Precipitation Data

As a convience, the IEM attempts to provide explicit hourly precipitation observations without the need for manual computation / deciphering observations. For ASOS sites, this means the total is either derived from the "top of the hour" METAR reports or from the daily summary message values. For DCP sites, this means either the explicit PPH SHEF variable is taken or the math is done to figure out the total from the PCI precipitation counter.

Backend documentation exists for those that wish to script against the backend service.

Data prior to 2010 only contains the non-zero values, whereas all hours are accounted for after 2010. This may be fixed in upcoming work on the database. On 23 Jan 2026, processing started to provide this information for DCP sites, but will take a number of days to backfill to 2010.

Select network to download from:

Select Network

1) Select Station(s):

The sites presented are those that have had hourly precipitation reported at some point during each station's period of record.

2) Select period:

	Year	Month	Day
Start:
End:

3) Metadata

Include Station Lat/Lon

Include State of Station

4) Timezone of Observation Times:

The following options are available for how the observation time is presented.

Download Fields

station: Common identifier for the station.
network: Network identifier for the station.
valid: Hour on which the precip fell.
precip_in: Hourly Precipitation [inch]. A value of 0.0001 denotes a Trace.
lat: Station Latitude (deg N), when selected.
lon: Station Longitude (deg E), when selected.
st: Station State Indentifier, when selected.