The Weather Service Form F-6 is used by reporting stations to record their unofficial daily climate data for the month. The daily data from the form is then used to calculate sums, means and departures for the month. The F6 is then sent to the National Climatic Data Center in Asheville, North Carolina for archiving, additional quality control, and official notation. 

The following is a brief description of each column of the WS Form F-6: 
 

TEMPERATURE  Max (Maximum): The high temperature for the day from midnight to midnight standard time  Min (Minimum): The low temperature for the day from midnight to midnight standard time  Mn (Mean): The mean temperature for the day from midnight to midnight, or the average of the Max and Min temperatures  Dep (Departure): The difference between the Mean for the day and the normal Mean for that date

DEGREE DAYS  Htg (Heating Degree Days): The difference between the Mean for the day and 65 degrees, when the Mean is below 65 degrees  Clg (Cooling Degree Days): The difference between the Mean for the day and 65 degrees, when the Mean is above 65 degrees

PRECIPITATION  Total: The liquid equivalent amount of all precipitation for the day from midnight to midnight, including rain, snow, sleet, freezing rain, hail, etc.  Snow: The total amount of precipitation from midnight to midnight made up of frozen or freezing precipitation  Depth: The depth of snow on the ground at 7 am standard time

WIND  Avg (Average): The average sustained, or two-minute average, wind for the day from midnight to midnight  Fast (Fastest): The speed of the fastest individual sustained, or two-minute average, wind for the day from midnight to midnight  Dir (Direction): The direction of the fastest sustained wind, in degrees on the compass

SUNSHINE  Mins (Minutes): The total number of minutes of sunshine for the day from sunrise to sunset  %Pos (Percent of Possible): The percent of possible sunshine for the day

WEATHER  Occur (Occurrences): See the chart at the bottom of the form for definitions of symbols

PEAK WIND  Spd (Speed): The speed of the peak gust of wind for the day from midnight to midnight  Dir (Direction): The direction of the peak wind gust, in degrees on the compass

MISCELLANEOUS  Fast (Fastest): The highest sustained wind for the month  Dir (Direction): The direction of the highest sustained wind  Poss (Possible): The most number of minutes of sunshine possible for the month  Prct (Percent): The percentage of possible sunshine received for the month, or the total minutes (Mins) divided by the possible minutes (Poss ) times 100  Spd (Speed): The peak gust of wind for the month  Dir (Direction): The direction of the peak gust