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Riley County
Riley County Conditions

Access daily temperatures, rainfall and record highs and lows for Manhattan
 
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, -13.72 behind in 2012
 
Average Rainfall for Riley County = 32.4 inches
 
 
Soil pH range 3.8 – 9.4, 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.)