The Davis GroWeather Wireless Integrated Sensor Suite is used for our WS-2 Premium Weather Station.6825_01_550x380 The corrosion-proof sensor suite combines a rain collector; solar irradiance, temperature and humidity sensors; and anemometer into one package for rugged reliability and performance. It features the Davis patented 24-Hour Fan-Aspirated Radiation Shield for maximum accuracy. It includes the Davis Vantage Connect Cellular radio for collection of the readings, typically every 15 minutes. The MyFarm web application displays current observations and calculates daily observations needed for irrigation management decisions.

Available Readings

  • Temperature
  • Relative Humidity
  • Rainfall
  • Solar Radiation
  • Wind Speed and Direction
  • Barometric Pressure
  • Dew Point


Relative Humidity

Range1 to 100%
Temperature Coefficient0.03% per °F (0.05% per °C), reference 68°F (20°C)


Resolution0.01″ or 0.2mm (user-selectable) (1mm at totals ≥ 20000 mm)
Daily/Storm Rainfall Range0 to 99.99″(0 to 999.8mm)
Monthly/Yearly/Total Rainfall Range0 to 199.99″ (0 to 6553 mm)
AccuracyFor rain rates up to 4″/hr(100mm/hr): ±4% of total or ± one tip of the
bucket (0.01″/0.2mm), whichever is greater.
Update Interval20 to 24 seconds

Rain Rate

Resolution and Units0.01″ or 0.1mm (user-selectable) at typical rates
Range0, 0.04″/hr (1mm/hr) to 96″/hr (0 to2 438mm/hr)
Accuracy±5% for rates less than 5″per hour (127mm/hr)
Update Interval20 to 24 seconds

Solar Radiation

Resolution and Units1 W/m²
Range0 to 1800 W/m²
Accuracy±5% of full scale (Reference: Eppley PSP at 1000W/m²)
Driftup to ±2% per year
Cosine Response±3% for angle of incidence from 0° to 75°
Temperature Coefficient-0.067% per °F (-0.12% per °C); reference temperature = 77°F (25 °C)
Update Interval50 seconds to 1 minute (5 minutes when dark)

Temperature (Outside)

Resolution0.1°F or 1°F or 0.1°C or 1°C nominal (°C is converted from °F rounded to the nearest 1°C
Range-40° to +150°F (-40° to +65°C)
Sensor Accuracy±0.5°F (±0.3°C)
Radiation Induced Error+4°F (2°C) at solar noon (insolation = 1040 W/m2, avg. wind speed  2 mph (1 m/
s)) (reference: RM Young Model 43408 Fan-Aspirated Radiation Shield)
Update Interval10 to 12 Seconds

Wind Direction

Range0 to 360°
Update Interval2.4 to 3 Seconds

Wind Speed

Resolution and Units1 mph, 1 km/h, 0.4 m/s, or 1 knot (user-selectable). Measured in mph, other units are converted from mph and rounded to nearest 1 km/hr, 0.1 m/s, or 1 knot.
Range1 to 200 mph, 1 to 173 knots, 0.5 to 89 m/s, 1 to 322 km/h
Accuracy±2mph (2kts, 3km/h, 1m/s) or ±5%, whichever is greater
Update IntervalInstant Reading: 2.5 to 3 seconds, 10-minute Average: 1 minute

Barometric Pressure

Resolution and UnitsMeasured in 0.01″ Hg. Other units are converted from Hg and rounded to nearest 0.1 mm, 0.1 hPa, 0.1mb.
Corrected Range26.00″ to 32.00″ Hg, 660 to 810 mm Hg, 880 to 1080 hPa or mb
Uncorrected Range16.00″ to 32.00″ Hg, 410 to 820 mm Hg, 540 to 11100 hPa or mb
Elevation Range-1500′ to +15,300′(-46 0m to 4670 m)
Uncorrected Reading Accuracy±0.03″ Hg (±0.8 mm Hg, ±1.0 hPa/mb)(at room temperature)
Sea-Level Reduction Equation UsedUnited States Method employed prior to use of current “R Factor” method
Equation SourceSmithsonian Meteorological Tables
Equation Accuracy±0.01″ Hg (±0.3 mm Hg, ±0.3 hPa/mb)
Equation Accuracy Required±10′(3m) to meet equation accuracy specification
Overall Accuracy±0.04″ Hg (±1.0 mm Hg, ±1.4 hPa/mb)
Trend (change in 3 hours)Change ±0.06″ (2.0 hPa/mb, 1.5 mmHg) = Rapidly
Change ±0.02″ (0.7hPa/mb, 0.5 mm Hg) = Slowly
Trend Indication5 Indicators: Rising (rapidly or slowly), Steady and Falling (rapidly or slowly)
Update Interval1 minute