Tucson's winters are mild, with temperatures ranging from near-freezing to the mid-20s Celsius in January and December. Spring arrives in March, bringing warmer days that can reach up to 31°C, but still occasional chilly nights. Summer is hot, with June and July temperatures often soaring above 40°C, while August is only slightly cooler. As autumn sets in, daytime temperatures begin to drop, returning to the mild range of winter by October.