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Books Books 1 - 1 of 1 on F and the average frostfree period is about 155 days. The average date for the last....
" F and the average frostfree period is about 155 days. The average date for the last killing frost in spring is May 8 ; that date for the first killing frost is October 10. "
A Handbook of Highland County: And a Supplement to Pendleton and Highland ... - Page 57
by Oren Frederic Morton - 1922 - 109 pages
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Geological Survey Water-supply Paper, Issues 1791-1794

Irrigation - 1965
...meanannual temperature, also at Fillmore, is 52 F and the average frostfree period is about 155 days. The average date for the last killing frost in spring is May 8 ; that date for the first killing frost is October 10. Evaporation from a US Weather Bureau class...
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