Product specifications

1-4
Vantage Pro2
™
Heat Index (calculated)
Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . .1°F or 1°C. Celsius is converted from Fahrenheit and rounded to the
nearest 1°C
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40° to +135°F (-40° to +57°C)
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±3°F (±1.5°C) (typical)
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 seconds
Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .United States National Weather Service (NWS)/NOAA
Formulation Used. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steadman (1979) modified by US NWS/NOAA and Davis Instruments
to increase range of use
Variables Used. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Outside Temperature and Instant Outside Relative Humidity
Current Display Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Calculation
Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Calculation; Daily, Monthly High
Historical Graph Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly Calculations; Daily, Monthly Highs
Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Instant Calculation
Humidity
Inside Relative Humidity (sensor located in console)
Resolution and Units. . . . . . . . . . . . . . . . . . . . . . . . . 1%
Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 100% RH
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5%
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 minute
Current Display Data . . . . . . . . . . . . . . . . . . . . . . . .Instant (user-adjustable offset available)
Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . .Instant, Hourly Reading; Daily, Monthly High and Low
Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . Hourly Readings; Daily, Monthly Highs and Lows
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High and Low Threshold from Instant Reading
Outside Relative Humidity (sensor located in ISS)
Resolution and Units. . . . . . . . . . . . . . . . . . . . . . . . . 1%
Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 100% RH
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±3% (0 to 90% RH), ±4% (90 to 100% RH)
Temperature Coefficient . . . . . . . . . . . . . . . . . . . . . . 0.03% per °F (0.05% per °C), reference 68°F (20°C)
Drift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.5% per year
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 seconds
Current Display Data . . . . . . . . . . . . . . . . . . . . . . . .Instant (user-adjustable offset available)
Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . .Instant and Hourly Reading; Daily, Monthly High and Low
Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . Hourly Readings; Daily, Monthly Highs and Lows
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High and Low Threshold from Instant Reading
Moon Phase
Console Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1/8 (12.5%) of a lunar cycle, 1/4 (25%) of lighted face on console
WeatherLink Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . 0.09% of a lunar cycle, 0.18% of lighted face maximum (depends on
screen resolution)
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .New Moon, Waxing Crescent, First Quarter, Waxing Gibbous, Full
Moon, Wanning Gibbous, Last Quarter, Waning Crescent
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±38 minutes
Rainfall
Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01" or 0.2 mm with optional metric adapter (included) (Console
rounds 1 mm if rain totals are 2000 mm or higher)
Daily/Storm Rainfall Range . . . . . . . . . . . . . . . . . . . . . . . 0 to 99.99" (0 to 9999 mm)
Monthly/Yearly/Total Rainfall Range. . . . . . . . . . . . . . . . . 0 to 199.99" (0 to 19999 mm)
Rain Rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 199.99" (0 to 19999 mm)
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . For rain rates up to 2"/hr (50 mm/hr): ±4% of total or +0.01" (0.2 mm)
(0.01" = one tip of the bucket, 0.2 mm with metric adapter), whichever
is greater.
For rain rates from 2"/hr (50 mm/hr) to 4"/hr (100 mm/hr): ±5% of total
or +0.01" (0.2 mm) (0.01" = one tip of the bucket, 0.2 mm with metric
rain adapter), whichever is greater.
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 seconds
Storm Determination Method . . . . . . . . . . . . . . . . . . . . . . 0.02" (0.5 mm) begins a storm event, 24 hours without further