Date: 09/13/2019

Number: 500

There have been 100’s of monarchs steaming off southern Lake Huron all day. They are now roosting in many of the trees near the lake. They have been feeding on the flowers in our yard. This is the second day in a row.

I saw the roost about the same time as the previous night.

The temperature was about the 75’F. This time they were landing in Magnolias and maple trees. There were fewer trees near the lake covered with butterflies. I did see them farther inland 400 feet from the beach. Fewer in each tree. I guessed about half the number I saw the night before, so 500.

Both times, the lake was fairly calm and the wind was out of the north. On the 12th we got a short rain storm. They were still in the trees around 8 am on Sept. 13th.

On Sept 12th and 13th, it was extremely humid for about 4 hours in the afternoon. The temperature felt like 85’F. The Lake Huron water temperature was 70’F on those two days.

When the monarchs landed in the trees each night, even though it was light out, they immediately folded their wings upward and only flew if disturbed by new arrivals.

Plympton-Wyoming, ON

Latitude: 43 Longitude: -82.2

Observed by: Judy
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