1. Humidity

2. These figures were all obtained from the National Climatic Data Center

3. High humidity can lead to fogs. This is the average annual number of heavy fog days.

4. Advection Fog

5. Radiation Fog

7. Two views from the steps to the Quad Looking South Looking North

8. From the satellite, you can see the fog in the valleys on a clear morning.

9. Another way humidity can be described is by cloudiness. How is a cloud different from a fog?

10. In this diagram, only the days which were completely cloudy were counted

11. Cloudiness can be quite seasonal. Notice the Lake Effect maximum.

12. By July, the number of cloudy days is way down and the Lake Effect is gone.

13. Next: When humidity goes wild – Precipitation!