Air temperatures have been collected from automated weather stations at Red Butte #2, Red Butte #4, and Red Butte #6 since 1982. Mean monthly air temperatures at Red Butte #2 were below freezing in December and January and above 20 °C in June, July ad August. In contrast, mean monthly temperatures at Red Butte #6 were below freezing only slightly longer, from November through February, and above 20 °C in July and August. During the main growing period (May through September), daytime maximum temperatures ranged between 18.7 and 31.8 °C (66-89 °F) at Red Butte #2, while nighttime minimum temperatures ranged between 5.2 and 16.4 °C (41-62 °F) (Fig. 9). At the higher elevation stations, daytime maximum air temperatures were lower.
