August 2017 Weather and Climate Summary and Forecast

July largely held true to forecast, although it ended with the start of one of the most extreme heat waves in decades in the PNW. Overall July ended up generally warmer than the 1981-2010 average for the majority of the western US (Figure 1). Areas in the northern Rockies saw the warmest conditions of 4-5°F above normal, while most other areas saw 1-2°F above normal. A few regions saw average to slightly cooler than average conditions in July; including western Washington, isolated areas of eastern Washington, extreme northwest Oregon, and in isolated areas around the Bay Area, the Salinas Valley, and portions of the southwest (Figure 1). From scattered reports around the west, the warm conditions have moved many close to the start of véraison (north) and others well into véraison (south). The warmth in the west extended across the US to the Plains, while portions of the south and southeast were closer to normal, and the extreme northern Great Lakes and New England were slightly cooler than normal (not shown).

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