Weather
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.


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Lewiston'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, Lewiston has a unique micro-climate for this region and is conducive to the introduction of a number of exotic deciduous and conifer tree species.

Temperature (F)
       
  Jan. March May July Sept. Nov.
Average high 39 53 70 89 77 48
Average low 27 34 46 59 50 34
Mean 34 44 58 74 64 41
Average precip. 1.3" 1.1" 1.3"  0.7"  0.8"  1.2"

 
           
Climate Indicators  
Average snowfall 1" per year
Annual average precipitation 12.52"
Growing season 220 days
Clear / partly cloudy days 90.7 / 77.8