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Riley County
Riley County Conditions


Historical Weather

Select the location you desire for information and the time span.
 

Weather Data Library
Access previous rainfall, soil temperature, and wind conditions for Manhattan

 
Average Last Spring Frost = April 18, May 9 is 95% frost free date
 
Average First Fall Frost = October 15
 
179 Growing Days
 
Average Rainfall in Manhattan = 34.8 inches
 
Average Rainfall for Riley County = 32.4 inches
 
 
Soil pH range 3.8 – 10, average is 7.2,  most common 7.7,  6.5 is preferred
 
Cold Hardiness Zone 6a = -10° to - 5° F.
 
Heat Zone 7 = 60 – 90 days (average number of days per year above 85° F.)