Hummingbird Rain Gauge. Building on the popularity of our best selling Nature Thermometers, we bring the warmth of flamed copper to rain gauges. They will provide your green space with both charm and a practical means to measure the day's rain-fall. Two piece Rain Gauge 15 in tall. Gift Boxed. Rain gauge alone measures 6 inches long inside diameter of rain gauge is 7/8 inch and the outside lip diameter is 1.25 inch.