I found this on the Chile pepper Institutes (New Mexico State University) website:
https://cpi.nmsu.edu/growing-chile-the-chile-pepper-institute/growing-tips/
"Flower and fruit development, the key to flower set is nighttime temperature, which ideally should be between 65 and 80 degrees. Fruit set is enhanced by increased sunlight, however fruit will not set when night temperatures are above 86 degrees F. Some varieties will take 130 days or more to complete maturation. New Mexican pods ripening at temperatures between 86 & 95 degrees F have twice as many capsaicinoids as pods ripening between 59 & 72 degrees F."
Convert to C and you should be good to go!