Courtesy of Rick Thoman:
Scattering of low temperatures at or just below freezing in a few of the usual Interior low spots Saturday morning. Does not happen every July but not especially unusual. #akwx @akswingley @Climatologist49 pic.twitter.com/UwwIhXg4Z4— Rick Thoman (@AlaskaWx) July 10, 2021
The 29°F at the Salcha RAWS is slightly impressive for the time of year: this has only happened twice in July in the past 15 years (27°F in 2012 and 29°F in 2018) - although last July had 30°F on 3 nights.
The chart below shows the hourly temperature trace, with the minimum occurring at 3am this morning and 1am yesterday (AKST).
Chicken also saw a freeze this morning: 31°F. Early last summer I commented that Chicken hadn't seen a hard freeze (28°F or lower) in the height of summer for several years, but then it happened less than a month after my post last year: 27°F on July 3, 2020.
The Chalkyitsik RAWS (31°F yesterday and today) was also colder last July: 28°F on July 23. None of these cold spots are reliably frost-free at any time of the year.
[Update July 11: 27°F this morning at the Salcha RAWS site. To find colder than this in July, we have to go back to 2005, when 24°F occurred on July 21. Also, Chicken saw 28°F this morning.]