Portland, Oregon Weather Information

A BRIEF DESCRIPTION OF PORTLAND'S CLIMATE (We really aren't constantly under umbrellas!)

• Portland is located at the northern end of the Willamette (Will-AM-ette) valley, between two mountain ranges. The Coast range on the west forces weather systems from the ocean to lift up and over Portland, generating the area's moderate rainfall. The Cascade mountains on the east provide a barrier to continental weather systems reaching Portland.

• The area has noticeable seasonal changes. The summers are mild---temperatures average in the mid 70's. The winds generally are northwesterly, and there is little rain. Only three percent of the annual rainfall occurs in July and August, and only nine percent occurs in the period June to September. There are short periods of hot, dry weather with temperatures in the mid to upper 90's.
  

• The winter has generally mild temperatures, cloudy skies and rain. 88 percent of the area's rainfall falls between October and May. Measurable snow falls, on average, five days each year, seldom more than a few inches, and remaining only a few days. Temperatures can, on occasion, fall well below freezing, however below zero temperatures are rare.
  

• Fall and early winter are times of change. There can be periods of fog, periods of rain, and periods of sunny/partly cloudy weather. Sometimes all within the same day.
  

• Spring is also a variable season. Periods of rain, periods of sun---again, many times occurring within the same day.
  

TEMPERATURE AVERAGES (degrees F)

Portland area	JAN	APR	JUL	OCT	YEAR
DAILY MAX.	46.6	59.5	82.4	66.8	63.5
DAILY MIN.	31.2	42.0	57.3	43.9	45.2
MONTHLY	38.9	50.8	69.9	55.4	54.4

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