DAVIS Vantage Pro Reference Manual page 27

Temperature, Extra Humidity, High Solar, High UV, and forecast fields (reedOpen and
reedClosed fields are removed).
You can use the VER command and parse the date returned to determine the archive data format,
or you can examine byte 42 in the archive record. In a Rev B record, it will have the value
0x00. In a Rev A record, this byte is used for "Leaf Wetness 4" which is never assigned a real
data value, so it will always contain 0xFF. Future record formats may assign different values for
this field.
Each archive record is 52 bytes. Records are sent to the PC in 264 byte pages. Each page
contains 5 archive records and 4 unused bytes. See section 5 for more details on performing
download operations.
The value in the "Dash Value" column is what you will see if that field is not updated at all
during the archive interval. A dash value can appear for several reasons, and different weather
variables are treated differently. For example, if you see 32767 for Outside Temperature that
could be because of a communication problem, the sensor was unplugged, or the sensor has
failed. Note, a dashed value is not always the sign of a problem. For example, the rainfall
reading could be 0 if no rain fell in that interval. To determine if a problem exists, often times
you will need to look at more than one weather variable.
Contents of the Rev "A" archive record.
Field
Date Stamp
Time Stamp
Outside Temperature
High Out Temperature
Low Out Temperature
Rainfall
High Rain Rate
Barometer
Solar Radiation
Number of Wind Samples
Inside Temperature
Offset Size Dash Value
0 2 Not applicable
2 2 Not applicable
4 2 32767
6 2 -32768
8 2 32767
10 2 0
12 2 0
14 2 0
16 2 32767
18 2 0
20 2 32767
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Explanation
These 16 bits hold the date that the archive was
written in the following format:
Year (7 bits) | Month (4 bits) | Day (5 bits) or:
day + month*32 + (year-2000)*512)
Time on the Vantage that the archive record was
written:
(Hour * 100) + minute.
Either the Average Outside Temperature, or the
Final Outside Temperature over the archive period.
Units are (°F / 10)
Highest Outside Temp over the archive period.
Lowest Outside Temp over the archive period.
Number of rain clicks over the archive period
Highest rain rate over the archive period, or the rate
shown on the console at the end of the period if there
was no rain. Units are (rain clicks / hour)
Barometer reading at the end of the archive period.
Units are (in Hg / 1000)
Average Solar Rad over the archive period.
2
Units are (Watts / m )
Number of packets containing wind speed data
received from the ISS or wireless anemometer.
Either the Average Inside Temperature, or the Final
Inside Temperature over the archive period. Units
are (°F / 10)