Therefore, it is recommended that if clouds are present, the average cloud percentage over the last 10 to 15 minutes be reported. Note if there are big puffy cumulus clouds or high light transparent cirrus clouds. Obstructions to a field of view can be caused by trees, buildings, or clouds. While observing, the percentage of sky that is blocked by these obstructions is noted at the beginning of the session and at any time a change has taken place. As a reminder, estimate the percentage of sky blockage so that corrections can be applied to the data to account for meteors possibly missed.
Clouds are difficult to estimate because they are constantly moving and are irregular in shape.
But try to assign an accurate as possible percentage. Make any notes of changing conditions on a line of meteor data. In addition to the above, keep in mind major showers tend to bring groups of people together for the show. The only problem with this is the tendency to pool data. Under no circumstances should this be done.