Here in Boise and in Lumby

http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=3029

A searing heat wave unprecedented for June scorched the Northwest
U.S. and Western Canada on Saturday and Sunday. Temperatures soared to their
highest June levels in recorded history for portions of Washington, Idaho,
Montana, and British Columbia; both Idaho and Washington set all-time high
temperature records for the month of June on Sunday. According to wunderground's
weather historian, Christopher C. Burt, the 113°F measured in
Walla Walla, Washington beat that state's previous June record of 112°F, set
at John Day Dam on June 18, 1961. In addition, the 111°F reading at Lewiston,
Idaho was that state's hottest June temperature on record.

What caused the heat wave?

The planet as a whole has experienced its warmest January - May period on record
this year, and it is much easier to set all-time heat records when your baseline
temperature is at record warm levels. But all-time records require some unusual
meteorology, and this week's heat wave was caused by an extreme jet stream
configuration that featured a very sharp ridge of high pressure over Western
North America and a compensating deep trough of low pressure over the Midwest
United States.

The ridge of high pressure allowed hot air from the Southwest U.S. to push
northwards, and brought sunny skies that allowed plenty of solar heating of the
ground. An extreme jet stream configuration also was in evidence over Western
Europe, where a strong ridge of high pressure on Sunday brought the warmest June
temperatures ever recorded to the Spanish cities of Madrid and Toledo. This sort
of extreme jet stream pattern has grown increasingly common in recent decades,
as I wrote about for the December 2014 issue of Scientific American (behind a
pay wall for $6.)