VISITING INFORMATION - Weather
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The Lewis-Clark Valley is located in North Central Idaho at the confluence of the Snake and Clearwater Rivers and enjoys one of the best climates in the Northwest.
Clarkston's climate is normally mild. An analysis of 90 years of weather records established the city's hardiness zone as USDA - 6a (-5 to -10F). Soils and water are commonly high alkaline (ph 7.1 - 7.3).
At an elevation of 735 feet above sea level, Clarkston has a unique micro-climate for this region and is conducive to the introduction of a number of exotic deciduous and conifer tree species.
Average Snowfall - 1'' per year
Annual Average Precipitation - 12.52''
Growing Season - 220 days per year
Average weather in the Lewis-Clark Valley |
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan. | Feb. | Mar. | Apr. | May | Jun. | Jul. | Aug. | Sep. | Oct. | Nov. | Dec. | |
| Average temp. (° F) | 33.4 |
38.1 |
44.4 |
50.8 |
58.1 |
65.3 |
72.9 |
72.9 |
63.4 |
51.4 |
40.1 |
33.6 |
| High temp. (° F) | 39.1 |
45.3 |
53.4 |
61.3 |
69.7 |
77.6 |
87.2 |
87.3 |
76.5 |
61.9 |
46.5 |
38.9 |
| Low temp. (° F) | 27.7 |
30.9 |
35.3 |
40.2 |
46.6 |
53.0 |
58.5 |
58.6 |
50.3 |
40.8 |
33.8 |
28.2 |
| Precipitation (inches) | 1.2 |
1.0 |
1.2 |
1.4 |
1.6 |
1.2 |
0.8 |
0.8 |
0.8 |
1.0 |
1.3 |
1.1 |
*Based on data reported by over 4,000 weather stations
Normal Climate Around the Lewis-Clark Valley |
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan. | Feb. | Mar. | Apr. | May | Jun. | Jul. | Aug. | Sep. | Oct. | Nov. | Dec. | |
| Days with precip. | 13 |
11 |
11 |
9 |
9 |
8 |
4 |
4 |
5 |
8 |
12 |
13 |
| Wind speed (mph) | 8.0 |
8.5 |
9.2 |
9.7 |
9.2 |
9.2 |
8.6 |
8.3 |
8.1 |
7.7 |
8.0 |
8.0 |
| Morning humidity (%) | 83 |
82 |
79 |
75 |
74 |
72 |
62 |
60 |
67 |
77 |
84 |
85 |
| Afternoon humidity (%) | 77 |
67 |
53 |
43 |
40 |
35 |
27 |
27 |
33 |
48 |
73 |
81 |
| Sunshine (%) | 29 |
42 |
55 |
61 |
64 |
67 |
80 |
78 |
72 |
55 |
30 |
24 |
| Days clear of clouds | 3 |
3 |
5 |
4 |
7 |
8 |
17 |
16 |
13 |
9 |
3 |
3 |
| Partly cloudly days | 4 |
5 |
8 |
9 |
10 |
10 |
8 |
9 |
8 |
8 |
5 |
4 |
| Cloudy days | 24 |
20 |
19 |
16 |
14 |
11 |
5 |
6 |
8 |
14 |
21 |
24 |
| Snowfall (inches) | 11.6 |
6.0 |
2.8 |
0.5 |
0.1 |
0.0 |
0.0 |
0.0 |
0.0 |
0.3 |
4.4 |
10.0 |