Airport data, except as noted. For period of record through 2000, except as noted. M=morning. A=afternoon

Heating and Cooling Degree Days Degree day data are used to estimate amounts of energy required to maintain comfortable indoor temperature levels. Daily values are computed from each days mean temperature (max + min/2). Each degree that a day's mean temperature is below or above 65 degrees Fahrenheit is counted as one heating or cooling degree day. Sunshine - Average Percentage of Possible The total time that sunshine reaches the surface of the earth is expressed as the percentage of the maximum amount possible from sunrise to sunset with clear sky conditions. Cloudiness - Mean Number of Days - Clear (CL), Partly Cloudy (PC), Cloudy (CD) Mean number of days per category of cloudiness. The categories are determined for daylight hours only. Clear denotes zero to 3/10 average sky cover. Partly cloudy denotes 4/10 to 7/10 average sky cover. Cloudy denotes 8/10 to 10/10 average sky cover. Average Relative Humidity (percent) - Morning (M) and Afternoon (A) The relative humidity is expressed as a percentage measure of the amount of moisture in the air compared to the maximum amount of moisture the air can hold at the same temperature and pressure. Average humidity values are given for selected morning and afternoon observations. Maximum relative humidity values usually occur during morning hours. In this publication, the Local Standard Time (LST) of morning and afternoon humidities are shown below. Atlantic, Alaskan (M morning 8 A.M.) (Afternoon 2 P.M.) Eastern, Bering, 165W Meridian (M morning 7 A.M.) (Afternoon 1 P.M.) Central, 180E Meridian (M morning 6 A.M.) (Afternoon NOON) Mountain, 165E Meridian (M morning 5 A.M.) (Afternoon 5 P.M.) Pacific, 150E Meridian (M morning 4 A.M.) (Afternoon 4 P.M.) 135E Meridian (M morning 9 A.M.) (Afternoon 3 P.M