The elements of a weather observation occur at the time of observation or cover the reported collection period prior to time of observation, e.g., precipitation total or average relative humidity. Time at which the maximum or minimum temperature occurred, on a 24-hour clock. Time is always Pacific Standard Time. Relative Humidity Maximum and minimum. The maximum and minimum values of relative humidity for the 24 hours prior to the time of observation.
Values are in percent.
The relative humidity averaged over the period prior to the time of observation. Solar Radiation Global solar radiation is found in this field. The value is for the reporting period prior to the time of observation. The average speed and direction over the prior period, in miles per hour or meters per second. Direction is in degrees, with 0 as North.