The rain gauges are mounted inside of the fence on the top of the structure. The white object at the top of the triangular mast is a wind speed and direction sensor. The wind direction is the direction the wind is coming FROM and not the direction it is going. A direction of 000 indicates calm winds. The radiation shield keeps sunlight from heating the gauges and distorting the readings.
Humidity is reported in percent.
This is the amount of water vapor in the air relative to the maximum amount it could hold at the present temperature. The cylinder on the right is an automatic tipping-bucket rain gauge. When the bucket fills the bar tips in the direction of the full bucket, placing the empty bucket under the funnel, and emptying the full one. The gauge measures rainfall by counting the number of times the bucket tips. To convert it to inches, divide it by 25.4.