REGION ) 
This zone includes a broad coastal strip of highly productive forest that 
extends south to Cape Blanco, and a narrower coastal strip that extends south from 
there to the California line. It has an average annual temperature of 52° to 530 
along the coast, and 55° in the interior with a minimum temperature of +19. It 
is moist but not wet, having a rainfall of from 52 to 78 inches. 
REGION 5 
This is the low rainfall zone in the rain shadow of the Olympics in the 
northern part of the Puget Sound region that has a maritime atmosphere. The aver- 
age temperature varies from 48° to 50°, The minimum on the islands is +5° and on 
the mainland is -39, The rainfall varies from 18 to 36 inches per year. 
REGION 6 
This is the cool northern zone on the west slope of the Cascades fran 
which much of the seed was obtained that has been sent to Europe to date. The 
average temperature varies from 9° to 50°, but the minimum drops to -11°. The 
average rainfall varies from 36 to 76 inches. 
REGION 7 
This is the first of the broad interior valley zones where the middle of 
the zone is made up of agricultural lands and the fringes toward the Coast Range 
to the west and toward the Cascades to the east constitute the forest areas. It 
varies in average annual temperature from 50° to 52°. The minimum varies also 
showing in some localities a minimum of -+10° and dropping as low in others as 
-16°. The rainfall varies from 30 to 60 inches. 
REGION 8 
This zone includes the northern half of the Willamette Valley from the 
summit of the Coast Range to the middle elevations in the Cascades. The average 
annual temperature varies from 52° to 53° with a minimum temperature of 10°. Like 
the zone to the north, the rainfall varies from 30 to 60 inches. 
REGION 9 
This includes the dry part of southwestern Oregon where, as you proceed 
southward, the Douglas-Fir is replaced for the most part by ponderosa pine, and 
the forests in a few instances divert from their characteristic even-aged condi~ 
tion to a sanewhat all-aged forest. The average annual temperature varies from 
53° to 54° but has a minimum as low as -10°. The rainfall varies from 20 to 5 
inches. 
As previously stated, these zones are general in character. They are 
based on U. S. Weather Bureau records as published in the publication "Better 
Douglas-Fir Forests from Better Seed" printed by the University of Washington. 
These records represent mostly the middle and lower altitudes within their res- 
pective regions. When cone collections are made at higher elevations, they will 
represent a proportionately colder and more moist climate. 
MANNING SEED COMPANY 
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