Clear skies: cloudless sky or 1/8 cloud cover

Slightly cloudy: between 1/8 and 2/8 cloud cover

Partly cloudy: between 2/8 and 4/8 cloud cover

Cloudy: between 4/8 and 5/8 cloud cover

Very cloudy: between 5/8 and 7/8 cloud cover

Overcast: between 7/8 and 8/8 cloud cover

Possibility of storms: increase in vertically-formed clouds with the possibility of storms

Mid- and high-level clouds: presence of mid- and high-level clouds (clouds situated at over 2,000m)

Mist: droplets of water suspended in the air, with visibility over 1 km and under 5 km

Fog: droplets of water suspended in the air, visibility less than 1 km

Light showers: intense but short showers, with water levels under 15mm/h

Heavy showers: intense but short showers, with water levels in excess of 15mm/h

Light rain: liquid rainfall, with water levels under 15mm/h

Heavy rain: liquid rainfall, with water levels in excess of 15 mm/h

Storms: sudden atmospheric electrical activity

Weak storms: some electrical activity; light hail, if any

Heavy storms: almost continuous electrical activity, strong gusts of wind and heavy hail

Snow: falling snowflakes

Light snow: snowfall, with accumulated ground levels under 10 cm/h

Heavy snow: snowfall, with accumulated ground levels in excess of 10 cm/h

Hail: short, intense hail showers

Hail storms: storms with precipitation in the form of hail

Frost: solidification of ground water due to temperatures of 0ºC or less

Falling temperatures: drop in temperature of between 1º and 4ºC

Sharp fall in temperature: drop in temperature of more than 4ºC

Stable temperatures: no variation or a maximum of one degree

Rising temperatures: rise of between 1º and 4ºC

Sharp rise in temperature: rise of more than 4ºC

Light wind: average wind speed under 20 km/h

Moderate wind: average wind speed between 20-40 km/h

Strong wind: average wind speed in excess of 40 km/h

Changeable wind: light wind coming from different directions

Calm (glassy): waves of 0 metres

Rippled sea: waves of 0.1 metres

Smooth: waves of 0.1 - 0.5 metres

Slight: waves of 0.5 - 1.25 metres

Moderate: waves of 1.25 - 2.25 metres

Rough: waves of 2.5 - 4 metres

Very rough: waves of 4 - 6 metres

Very heavy: waves of 6 - 9 metres

Very high: waves of 9 - 14 metres

Stormy: waves over 14 metres