See the table below for a closer look at the actual numbers. You can see in some cities such as Ephrata and Portland, the previous records were shattered by 3 to 4 degrees.
See image below for the graphical depiction.
Not only was it hot, but June was also dry which has caused elevated fire danger across the region. See map below showing the % of normal precipitation for June
So what caused this abnormally warm and dry conditions. An anomalous ridge was in place over the Inland NW causing the record warmth.
This past June was a month to remember. We'll see what the rest of the summer offers, with the latest long range outlooks from the Climate Prediction Center favoring increased odds of the continued warmth.