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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
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.)