In our climate here where summer day time high in the 80's and low in upper 50's is common, I have been able to grow Halona and Petit Gris de Rennes Melon.
The DTM for Halona is rated between 68-75 days while Petit Gris de Rennes is 80-85. If not because I received the Petit Gris de Rennes seeds in the seed exchange, I wouldn't even think of trying it because of the 80-85 DTM. It's a pleasant surprise that it grows well enough here. I have seen description that says it is well adapted to cool climate.
I use the DTM number as a reference only. A DTM of 80 usually translates to 120-160 days for our area.