Cover line???

Question

Can some one tell me what my cover line is​

Answer

I found these steps online:
1. You identify a temperature that is at least 0.2 or two-tenths of a degree higher than the previous six days. 
2. Highlight those previous six days 
3. Find the highest of these six highlighted temperatures 
4. Draw a straight line that is 0.1 or one-tenth of a degree higher than that of the highest of the highlighted temperatures 
5.  This line is your coverline 
6. The coverline should run straight horizontally across your chart

Glow automatically added my cover line after a few days of carting. This is my first time charting, my chart is below.  Are you checking temp at the same time everyday before you get out of bed?

Answer

I bought a book that explains it pretty well so I a pic for you.  Hope it helps!

Answer

I can't figure out how people know their cover lines