Percentage sun is estimated from the amount of sunshine experienced during the surveying. For example if it was sunny during three quarters of the survey then the percentage cover of sun would be 75%. It is officially sunny when an object can cast a shadow.
Beuafort wind scale
0. Calm. Smoke rises vertically. 4. Dust raised small branches move.
1 Smoke drift indicates wind 5. Moderate sized direction. Branches move. Small
2. Wind felt on skin. Leaves rustle. Trees sway.
3. Leaves and small twigs move. 6. Large branches move.
Larger trees start to