This bin was up to 125°, with 22° night temps & near 40° days. So it's cooking.
It may be to late in the season to get it up around 140 since it's a smaller bin & only about 2-1/2 feet high.
My big compost bin (a mix & layers of all the garden plants, leaves & grass) was at 145 yesterday, cooking seeds temps.
It's 5'X5' & I had it stacked well over full, (around 5-1/2' high). It shrinks noticeably every few days so I know it's working. I'm out of stuff to add, mowed the grass the last time, leaves are all picked up, neighbors leaves are all picked up & the garden is empty. Hoping for a few yards of good compost. I usually shrinks to about a 2-1/2 foot high bin by Spring. Then,the first Spring yard mowing, I add the green grass clippings to get it cooking & it's done by August & I empty & start a new batch.