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Putnam County experiences a temperate climate with generally mild winters and moderately humid summers. Cold weather comes mostly from the northwest, originating in western Canada, while heat and humidity come from Gulf-coast air masses. Prevailing winds during the summer months are from the southwest; prevailing winds in the winter are from the northwest.
Putnam County is near the boarder of North American Agricultural Zones 5 and 6. The Zone 6 hardiness bank, in which Greencastle is located, is hardy for most common North American fruit, shrubs, and ornamentals. The growing season is
175 days.
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| Temperature: |
| Minimum Average: |
17°F in January |
| Maximum Average: |
87°F in July |
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| Precipitation: |
| Average Annual: |
Approx. 42 inches |
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| Average Annual: |
Approx. 21 inches |
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| Cooling Degree Days: |
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1,068 |
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| Heating Degree Days: |
| Annual (65°F Base): |
5,609 |
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| Percentage of Available Sunshine: |
| January & December: |
Approx. 40% |
| June, July, August & September:
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Approx. 70% |
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