The temporal correlation would measure the similarity of one signal over time.
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A correlation of 0.20 is somewhat low, meaning that the degree of linear relationship measured between the two variables involved is low. However, such a degree of relationship would not be ignored in many fields of science where relationships are difficult to detect. Correlation is rarely if ever put in terms of percentage.
No. The strongest correlation coefficient is +1 (positive correlation) and -1 (negative correlation).
No.
No. The units of the two variables in a correlation will not change the value of the correlation coefficient.
A correlation coefficient of 1 (r=1) is a perfect positive correlation.