One half of a sphere. The term is usually applied to regions north or south of the equator.
High:
Also known as an 'anticyclone' - an area of high air pressure with a system of winds rotating outwards. This usually means dry weather. It is the opposite of a 'low'.
Humidity:
The amount of water vapour in the air.
Hurricane:
A tropical revolving storm with sustained wind speeds of more than 118 km/h (73 mph). Also known as a typhoon or cyclone.
Hygrometer:
An instrument for measuring humidity.
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Hail: