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Average Last Spring Frost Dates for Selected North Carolina Locations

By: Katharine Perry Horticulture Information Leaflets

Frost forms on solid objects when the water vapor in the atmosphere changes from its vapor phase to small ice crystals. Frost is not frozen dew. If you see frost than you know that the temperature of the object it is on reached 32°F or lower. However, the air temperature, measured at five feet above ground in the vicinity of this object, is likely several degrees higher. Conversely, not every air temperature recorded at or below 32°F means frost formed on solid objects in the area. In spite of this, the average date of the last spring air temperature of 32°F has traditionally been called the last frost date. The dates presented in this leaflet are the average date of the last recorded air temperature at 32°F or lower for the period 1951 - 1980.

Average First Fall Frost Dates for Selected North Carolina Locations

By: Katharine Perry Horticulture Information Leaflets

Frost forms on solid objects when the water vapor in the atmosphere changes from its vapor phase to small ice crystals. Frost is not frozen dew. If you see frost than you know that the temperature of the object it is on reached 32°F or lower. However, the air temperature, measured at five feet above ground in the vicinity of this object, is likely several degrees higher. Conversely, not every air temperature recorded at or below 32°F means frost formed on solid objects in the area. In spite of this, the average date of the last spring air temperature of 32°F has traditionally been called the last frost date.

Average Growing Season for Selected North Carolina Locations

By: Katharine Perry Horticulture Information Leaflets

Growing season is defined as the number of days without an air temperature of 32°F or lower. This leaflet offers tables indicating the average growing season, as well as he standard deviation (the amount of dispersion around the average) for cities around North Carolina.

Average Solar Radiation and Wind Information for North Carolina

By: Katharine Perry Horticulture Information Leaflets

Solar radiation provides the energy to warm our atmosphere and allow plant growth and animal life to exist on earth. The amount of “possible solar radiation” does not depend on the weather and is constant for a given date from year to year. The variation in “possible solar radiation” by date throughout the year is due to the earth’s axis of rotation, which affects the hours of daylight and the angle (directness) of the sun’s rays. The amount actually received, however, does vary, mainly due to the variation in amount of cloudiness.

Guide to Deciding When to Start and Stop Irrigation for Frost Protection of Fruit Crops

By: Katharine Perry Horticulture Information Leaflets

The decisions of when to turn an irrigation system on and off for frost protection are complex and difficult. This guide presents a procedure to follow in making these decisions. This guide is based on the assumption that you have completed certain tasks prior to the night of the decision making. These tasks encompass important planning decisions that are made well ahead of the frost season.