Homemade Weather Scales
At about the same times each day, you should chart any combination of these weather indicators: high and low temperatures, barometric pressures, humidity, wind directions and measurable precipitation. Charting the hours of sunshine in the day is also an option.
Cloud Cover and Fog
To chart cloud cover, describe how cloudy or clear it is. For fog, technically, visibility is less than approximately a half mile. Thus, choose three or four reference points at varying distances, and base fog conditions on their visibility.
Suggestion
The devices you need to measure weather indicators are not expensive. However, with a little ingenuity, you can manufacture some of them. For example, you can make a wind sock out of a piece of nylon.