The short answer is no, in general our springs are not getting colder west of the Cascades, but the last 5 April-May 2 month periods have been either average or below. The data above is from all western Oregon inland stations…basically all areas between the Coast and Cascade Ranges. Note the 100 year trend shows no significant change. Warmer springs in the 30s and 40s, then colder springs in the 60s and 70s. Back to warm springs again in the late 1980s through the mid 2000s. Are we back in a 10-20 year period of cool springs? Time will tell I suppose. By the way, for those of you worried about a “bleedover” into cooler summers? Definitely not, the trend is significantly warmer both for July-August and July-September. Summers are getting warmer (maybe later?), but springs are either the same or (recently) cooler. Here’s the spring rainfall graph; an increase there for sure…April-May has been getting wetter in Western Oregon:
Remember these graphs only apply to a specific geographic area and I didn’t look at the trend east of the Cascades or up in Washington.
Chief Meteorologist Mark Nelsen