optional A machine-readable text summary of this data point, suitable
for selecting an icon for display. If defined, this property will have one
of the following values:
optional The intensity (in inches of liquid water per hour) of
precipitation occurring at the given time. This value is conditional on
probability (that is, assuming any precipitation occurs at all) for
minutely data points, and unconditional otherwise.
optional A human-readable text summary of this data point. (This property
has millions of possible values, so don’t use it for automated purposes:
use the icon property, instead!)
required The UNIX time at which this data point begins. minutely data
point are always aligned to the top of the minute, hourly data point
objects to the top of the hour, and daily data point objects to midnight
of the day, all according to the local time zone.
optional The direction that the wind is coming from in degrees, with
true north at 0° and progressing clockwise. (If windSpeed is zero, then
this value will not be defined.)