“ The coldest thirty day period is December with an ordinary day-to-day high of 46.9
°F (8.3 °C), although overnight lows usually continue to be
previously mentioned freezing by a couple levels.
The infrequency of chilly waves renders the imply for the coldest high to be
at the exact freezing position of 32 °F ( °C). The average window for freezing temperatures
to perhaps happen is between November 15 and March 19, permitting a growing period of 240 times.
Evening temperatures tumble to or below freezing 32 evenings for every 12 months on regular, but very rarely to
or below 18 °F (−8 °C). To the west of the Tualatin Mountains lies the Oregon Coast Range, and to the east lies the actively volcanic Cascade Range.
The rocks of the Portland region selection in age from late Eocene
to a lot more current eras. Though significantly of downtown Portland is reasonably flat,
the foothills of the Tualatin Mountains, additional frequently referred to domestically
as the "West Hills", pierce by the northwest and southwest reaches of the metropolis.
Portland's cityscape derives significantly of its character from the several
bridges that span the Willamette River downtown, several
of which are historic landmarks, and Portland has been nicknamed "Bridgetown" for a
lot of decades as a result. ”