Illinois Climate Network: Instruments used in the Illinois Climate Network, Illinois State Water Survey

Water and Atmospheric Resources Monitoring Program (WARM)

Weather Soil Groundwater Sediment Streamflow Reservoirs

Illinois Climate Network: Instruments used in the Illinois Climate Network


Parameter Instrument Sampling Frequency Accuracy Unit of measurement Height of measurement Notes
Air Temperature Campbell Scientific HMP45C sensor 10 seconds – data averaged
over an hour
+/- 0.4° C at -20°C
+/- 0.3° C at 0°C
+/- 0.2°C at 20°C
+/- 0.3°C at 40°C
degrees Celsius (°C) 2 m above ground Housed in a naturally aspirated radiation shield
Relative Humidity Campbell Scientific HMP45C sensor 10 seconds – data averaged
over an hour
+/- 2% RH
(0 – 90% RH)
+/- 3% RH
(90 – 100% RH)
percent (%) 2 m above ground Housed in a naturally aspirated radiation shield
Wind Speed RM Young 05103 anemometer 10 seconds – data averaged
over an hour
±0.6 mph or 1% of reading meters per second (m/s) 10 m above ground
(prior to winter 2011/2012 measurements
made at 9.1 m (30 ft))
Wind Direction RM Young 05103 anemometer 10 seconds – data averaged
over an hour
±0.3° or 1% of reading degrees (°) 10 m above ground
(prior to winter 2011/2012 measurements
made at 9.1 m (30 ft))
Solar Radiation Eppley Laboratory 8-48 pyranometer 10 seconds – data averaged
over an hour
+/- 5% kilowatts/ square meters (kW/m2)
Precipitation Ott Pluvio rain gage 1 minute – data totaled
for hour
+/- 0.005 in or 5% inches (in) opening at 1 m above ground Belfort rain gages were used at stations prior to summer/fall 2008.
Barometric Pressure Campbell Scientific barometers (105 or SBP270) 10 seconds (SBP270)
or 10 minute (105) –
data averaged over an hour
+/- 0.5 mb at 20°C (105)
+/- 0.2 mb (SBP270
millibars (mb)
Soil Temperature Campbell Scientific 107 sensor 10 seconds – data averaged
over an hour
+/- 0.4° C for range of -24 to 48°C degrees Celsius (°C) under sod – 4” and 8” below ground
under bare soil – 4” below ground
Soil Moisture Stevens hydraprobe sensor 1 hour +/- 0.03 wfv water fraction by volume (wfv) 2, 4, 8, 20, 39, and 59” below ground



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