Not getting heat vibes out of the models. June can be a deceptively springlike month this far north during the right year, and we're painfully due.
June's long term average before 2013 was 60.5F. Since then, we haven't recorded a mean below 61.0F. 2012 had a proper Juneuary, dropping a nifty 58.3F; cooler than NINE out of the last 14 Mays. That's a stat.
Upon inception of -dAAMt mid-month, you would expect any ridge to retrograde offshore fairly quickly. Very skeptical of any prolonged western heat with this wave cycle, could be quite awhile until a lower frequency +TNH tendency becomes apparent.