Genus - Type of cloud.

Species - Cloud shape and structure.

Variety - Arrangement of elements and transparency.

Barometer - A device to measure changes in atmospheric pressure

Hygrometer - An instrument that measures humidity.

Weather vane - An instrument that measures wind direction.

Anemometer - An instrument that measures wind speed.

Thermal energy - Energy from the heat of the sun and earth.

29.92 inches of mercury - Believe it or not this is the height of mercury equal in weight to the amount of air above you and this can be measured directly with a mercury barometer.

Relative humidity - The amount of moisture currently in the air compared to the maximum amount of moisture the air would be able to hold at the current temperature, expressed as a percentage.

Anomometer - An instrument for measuring the force of the wind.