Appendix A. Climate

Click on each image to see a full-size version.

 

 

Figure A-1. Selected weather stations within Salmon River subbasin. The location of selected weather stations is shown with watershed boundaries and major streams

Figure A-2. Summary of climatic patterns with the Salmon Subbasin. Mean monthly and annual climatic data are summarized for selected weather stations within the subbasin. Stations are selected to represent broad climatic regimes. The distribution of climatic regimes within the subbasin is displayed in the upper left corner. See Table C-1 for detailed descriptions of the Koppen climatic classes.

 

Table A-1. Koppen climatic classification applied to the Salmon Subbasin. Representative weather stations are listed by class.

Classification

Description

Representative weather station(s) within Salmon subbasin

class

1st qualifier

2nd qualifier

B

S

k

most precipitation occurs in warmest 6 months of the year (though not > 70 percent of the precipititation); very dry, but not so dry that mean annual precipitation is less than the value (t + 7) (where t is mean annual temperature (degrees C)); mean annual temperature < 64.4 C

Challis, Leadore, Salmon

C

f

warm summers, mild winters (mean temperature of warmest > 50 F; mean temperature of coldest month < 64.4 and > 32 F); precipitation relatively evenly distributed between winter and summer

a

mean annual temperature of warmest month is > 71.6 F

Riggins

b

relatively long period of summer warmth (each of four warmest months > 50 F)

n.a.

D

warm summers, cold winters (mean temperature of warmest > 50 F; mean temperature of coldest month < 32 F)

f

precipitation relatively evenly distributed between winter and summer

a

mean annual temperature of warmest month is > 71.6 F

n.a.

b

relatively long period of summer warmth (each of four warmest months > 50 F)

Grangeville, Middle Fork Lodge

c

relatively short period of summer warmth (one to three months > 50 F)

Stanley

s

extreme difference in summer versus winter precipitation; summers are much drier

b

relatively long period of summer warmth (each of four warmest monthes > 50 F)

New Meadows

c

relatively short period of summer warmth (one to three months > 50 F)

Dixie, Galena, Yellow Pine

H

due to high elevation the mean temperature of the warmest month is < 50 F

n.a.