Date: 09/09/2019

Number: 151

Saw them roosting for the night, this area is used a lot for nectaring and roosting, there are two large fields filled with Spotted Knapweed and Goldenrod near the roost site

Editor's note: contacted observer for more details on this sighting

Cannot confirm date roost first formed.
Observed roost in evening, an hour before sunset and just after the sun had set. I took several pictures, sunset was at 7:27pm

How did you arrive at 151 adults? Counted, not all are shown in photo and it was rapidly getting dark, so probably under counted. There were several other trees and bushes with smaller groups...to the east about a half mile was another roost site that I had observed earlier & took a few pictures

Overnight temps? According to the records, it was a sunny day with a high of 65 F and overnight low of 51 F. it was breezy and cool when I was there but I did not record the temp

What was the wind direction? Were the monarchs shielded from the wind in this location? There was little to NO wind that evening.

Also the other roost to the east/NE was on the SSW side of the tree. The one I reported was on the S to SW side

Yes, they were protected from the wind, heavy treeline along a ridge.
I have seen them use this spot for several years now, if memory serves me well I believe the wind was from the south, south east

Sterling Nature Center, NY

Latitude: 43.4 Longitude: -76.7

Observed by: Phillip
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