Clear Sky Clock

How do I read it?

Cloud Cover

Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear

Transparency

Poor Below Average Average Above average Transparent

Seeing

Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5

Darkness

-4 -3 -2 -1 0 1.0 2.0 3.0 3.5 4.0 4.5 5.0 5.2 5.4 5.6 5.8 6.0

Wind

Storm Strong Moderate Light to Moderate Light Calm

Humidity

<29% 30% to 35% 35% to 40% 40% to 45% 45% to 50% 50% to 55% 55% to 60% 60% to 70% 65% to 70% 70% to 75% 75% to 80% 80% to 85% 85% to 90% 90% to 95% 95% to 100%

Temperature

< -35C -35C to -30C -30C to -25C -25C to -20C -20C to -15C -15C to -10C -10C to -5C -5C to 0C 0C to 5C 5C to 10C 10C to 15C 15C to 20C 20C to 25C 25C to 30C 30C to 35C 35C to 40C > 40C