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A dimensionless ratio, expressed in percent, of the amount of atmospheric moisture present relative to the amount that would be present if the air were saturated. Since the latter amount is dependent [..]

The loss of water from the earth's surface through the combined processes of evaporation (from the soil and plant surfaces) and plant transpiration (from the soil through the roots and stem, and [..]

Growing degree days, or GDDs, are used to estimate the growth and development of plants during the growing season. GDD is calculated by subtracting the base temperature from the mean temperature. If t [..]

the GDD base temperature for the organism being monitored Growing Degree Days5

((Tmax

If a frost period is sufficiently severe to end the growing season (or delay its beginning), it is commonly referred to as a killing frost. This usually requires a temperature below -2°C for a suffici [..]

The location east or west in reference to the Prime Meridian, which is designated as zero (0) degrees longitude. The distance between lines of longitude are greater at the equator and smaller at the h [..]

The highest humidity during a 24-hour period. Mean Relative Humidity (%):

The highest temperature during a 24-hour period, expressed in degrees Celsius. Mean Temperature (C):