Warmest May in 17 Years

Oregon strawberries are at the farm stands already; a little earlier than normal.  That’s because the last half of spring has been warmer than normal.  You can see the above average temps along the West Coast on the 30 day temperature anomaly map:


It sure hasn’t been a “hot” May, but it has been consistently warm.  And have you noticed what else is different?  We haven’t had any long period of cool and wet weather!   30dayrainanomalyRainfall is running about average for northwest Oregon and southwest Washington, but the severe drought continues across southern Oregon and California.

Earlier tonight I calculated the monthly average temp with the numbers so far and then added in the forecast highs/lows for the next 3 days.  It appears that the average temperature will remain about 3 degrees above average here in Portland.  That’ll give us the warmest May in 17 years!


As mentioned, we’ve sure seen hotter weather in May, but most years that is then followed or preceded by cool/showery weather.  By the way, there’s a very good chance the much warmer than normal northeast Pacific waters are at least somewhat to “blame”.  That along with a lack of chilly westerly upper-level flow too.  Check out the huge warm pool from the coastline all the way out into the central Pacific. cpac_cdas1_anom__2_ It has been there for at least 6 months and probably isn’t going anywhere with El Nino developing to the south.  Another reason we will likely see warmer than average temps this summer, along with the data we’re seeing elsewhere referenced in a posting last week.

We will remain in weak upper-level troughing over the next 5-7 days, so we won’t be cloud-free and we won’t see decent offshore flow to push temps well into the 80s.  But temps will return to a few degrees above average (70s) starting Friday and continuing through most of next week.

Chief Meteorologist Mark Nelsen

15 Responses to Warmest May in 17 Years

  1. High Desert Mat says:

    Nice t-storm just to the west of me. And a few smaller ones to the south. Hope they make it to me, dont want to water lawn tonight.

  2. Timmy_Supercell (Klamath Falls @ 4200') says:

    Yesterday 05/29 Klamath Falls had a record low temp of 27 degrees, beating previous record of 28 set in 1977.

    This morning it was 37 degrees. I assume yesterday may have been my last 20’s low. So far I haven’t seen anything below 30 in June yet. I’m sure it’s happened before.

  3. 41 this morning in BG.

    Coolest low since the 12th.

  4. schmit44 says:

    5/29/2014 Oregon (All) Temperature Summary

    High:81 at HEPP( 311 ft) & DW5789 Eagle Poi(1463 ft) & EW1735 Central P(1285 ft) & Medford Viaduct(1360 ft)
    Low: 55 at LINCON Lincoln C(187 ft)

    High:43 at Mount Hood Meado(6601 ft)
    Low: 13 at Horse Ridge (US (4160 ft )

    Largest Diurnal Change: 54 degrees
    Horse Ridge (US (67/13 ) (4160 ft )

    Heaviest Rainfall:
    0.19″ at LOG CREEK(2800ft)
    0.16″ at Roseburg Regiona(525ft)
    0.15″ at TILLAMOOK(11ft)
    0.15″ at HEBOWX Mt. Hebo(3160ft)
    0.14″ at DW4118 Sandy(1250ft)
    0.14″ at CEDAR(2220ft)

  5. Boydo3 N. Albany says:

    Will be interesting to watch the off shore temps this summer. May make for a great summer on the coast after last summer’s cold and foggy one.
    Maybe some tropical fish show up in the catch off shore too.

  6. pappoose in scappoose says:

    “It’s said a 56 mph updraft will support a golf-ball-sized hailstone, so the updrafts in these particular hailstorms featured above were even stronger!”


  7. W7ENK says:

    My strawberries are already ripening, ahead of schedule again this year, though that section of my garden is overrun by grass and weeds right now, too. I haven’t been keeping up!

  8. runrain says:

    Does this mean the water at the Oregon Coast beaches will actually be just warm enough to go into without numbing body parts?

  9. marinersfan85 says:

    Warm Bias!!!

  10. schmit44 says:

    5/28/2014 Oregon (All) Temperature Summary

    High:74 at Ontario Municipa(2188 ft)
    Low: 56 at ECHO(683 ft)

    High:33 at Mount Hood Meado(6601 ft)
    Low: 23 at Horse Ridge (US (4160 ft )

    Largest Diurnal Change: 32 degrees
    PROVOLT SEED ORC (69/37 ) (1180 ft )

    Heaviest Rainfall:
    0.97″ at KA7IKB-2 West Li(545ft)
    0.91″ at DW8761 Gleneden(72ft)
    0.90″ at SOUTH FORK BULL(2630ft)
    0.90″ at HOLLAND MEADOWS(4900ft)
    0.89″ at YACHTS Yachats(82ft)
    0.84″ at EW2235 Troutdale(1381ft)

%d bloggers like this: