NWS Jacksonville » Climate Page » Interpretting the F6

How to interpret the Monthly Climate Summaries (F6's)

TEMPERATURE IN F:       :PCPN:    SNOW:  WIND      :SUNSHINE: SKY     :PK WND
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1   2   3   4   5  6A  6B    7    8   9   10  11  12  13   14  15   16   17  18
                                          AVG MX 2MIN
DY MAX MIN AVG DEP HDD CDD  WTR  SNW DPTH SPD SPD DIR MIN PSBL S-S WX    SPD DR
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 1  88  72  80   0   0  15 0.01  0.0    0  7.3 20 110 709   92   5 1      23  90
 2  89  72  81   1   0  16    T  0.0    0  5.5 16  70 703   92   4        21 120
 3  91  72  82   2   0  17 0.00  0.0    0  3.8 15 120 606   79   6        18 130


The climate data provided has 18 columns of information. All data is gathered for the time period from midnight to midnight EST. The following is a brief description of each column:

Column 1 (DY) - Day of the month.
Column 2 (MAX) - High temperature.
Column 3 (MIN) - Low temperature.
Column 4 (AVG) - Average temperature.
Column 5 (DEP) - Departure from normal (how many degrees above or below normal the average temperature was). Negative is below normal, while no sign indicates above normal.
Column 6a (HDD) - Heating degree days (based on how many degrees below 65 that the average temperature was). This information is useful for utility companies and certain other industries that track power consumption.
Column 6b (CDD) - Cooling degree days (based on how many degrees above 65 that the average temperature was). Like heating degree days, also useful to companies tracking power consumption.
Column 7 (WTR) - Daily precipitation. The liquid equivalent of the rain/snow/sleet/hail that fell. In our area, this is most often the total daily rainfall. Measured to the nearest hundredth of an inch. A "T" indicates a trace amount fell, which is reported when precipitation occurs but is less than one hundredth of an inch.
Column 8 (SNW) - Snowfall. The amount of snow or ice that fell. Measured to the nearest tenth of an inch.
Column 9 (DPTH) - Snow depth. Measured at 7am EST. The amount of snow or ice that has accumulated on the ground at that time.
Column 10 (AVG SPD) - Average wind speed. Reported to the nearest tenth of a mile per hour (mph).
Column 11 (MX SPD) - Maximum sustained (2-minute average) wind speed. Reported to the nearest mile per hour (mph).
Column 12 (2 MIN DIR) - Direction from which the maximum sustained (2-minute average) wind occurred. Measured in compass degrees (90 is east, 180 is south, 270 is west, 360 is north, 0 is calm).
Column 13 (MIN) - Minutes of sunshine measured by the sunshine counter. This information is not available at all sites.
Column 14 (PSBL) - Percent of possible sunshine. This information is not available at all sites.
Column 15 (S-S) - Average sky cover in tenths from sunrise to sunset.
Column 16 (WX) - Indicates the type(s) of weather that occurred during the day. The following lists the codes that may appear:

1 = Fog reducing visibility to less than 7 miles, but more than 1/4 mile.
2 = Fog reducing visibility to 1/2 mile or less.
3 = Thunder reported at station.
4 = Ice pellets or sleet.
5 = Hail.
6 = Glaze or rime (ice accumulated during the day).
7 = Blowing dust or sand reducing visibility to 1/2 mile or less.
8 = Smoke or haze.
9 = Blowing snow.
X = Tornado, funnel cloud, or waterspout seen from station.

Column 17 (SPD) - Peak wind gust measured in miles per hour (mph).
Column 18 (DR) - Direction from which the peak wind gust occurred (measured in degrees).


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