How to read the climatological data form:
STATION: ORLANDO
MONTH: JANUARY
YEAR: 2003
LATITUDE: 28 25 N
LONGITUDE: 81 19 W
TEMPERATURE IN F: :PCPN: SNOW: WIND :SUNSHINE: SKY :PK WND
================================================================================
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
================================================================================
1 76 56 66 5 0 1 0.77 0.0 0 10.9 28 250 M M 5 13 36 240
2 73 53 63 2 2 0 0.00 0.0 0 5.2 15 270 M M 7 1 18 260
.
. ...Data for each day of the month here...
.
30 76 48 62 1 3 0 0.00 0.0 0 2.0 12 310 M M 5 14 310
31 77 51 64 3 1 0 0.00 0.0 0 3.2 13 10 M M 6 14 10
================================================================================
SM 2045 1302 337 1 0.80 0.0 255.8 M 122
================================================================================
AV 66.0 42.0 8.3 FASTST PSBL % 4 MAX(MPH)
MISC ----> 29 340 36 240
================================================================================
NOTES:
# LAST OF SEVERAL OCCURRENCES
COLUMN 17 PEAK WIND IN M.P.H.
PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6) , PAGE 2
STATION: ORLANDO
MONTH: JANUARY
YEAR: 2003
LATITUDE: 28 25 N
LONGITUDE: 81 19 W
[TEMPERATURE DATA] [PRECIPITATION DATA] SYMBOLS USED IN COLUMN 16
AVERAGE MONTHLY: 54.0 TOTAL FOR MONTH: 0.80 1 = FOG
DPTR FM NORMAL: -6.9 DPTR FM NORMAL: -1.63 2 = FOG REDUCING VISIBILITY
HIGHEST: 77 ON 31,22 GRTST 24HR 4.06 ON 31- 1 TO 1/4 MILE OR LESS
LOWEST: 27 ON 24 3 = THUNDER
SNOW, ICE PELLETS, HAIL 4 = ICE PELLETS
TOTAL MONTH: 0.0 INCH 5 = HAIL
GRTST 24HR 0.0 6 = GLAZE OR RIME
GRTST DEPTH: 0 7 = BLOWING DUST OR SAND:
VSBY 1/2 MILE OR LESS
8 = SMOKE OR HAZE
[NO. OF DAYS WITH] [WEATHER - DAYS WITH] 9 = BLOWING SNOW
X = TORNADO
MAX 32 OR BELOW: 0 0.01 INCH OR MORE: 3
MAX 90 OR ABOVE: 0 0.10 INCH OR MORE: 1
MIN 32 OR BELOW: 2 0.50 INCH OR MORE: 1
MIN 0 OR BELOW: 0 1.00 INCH OR MORE: 0
[HDD (BASE 65) ]
TOTAL THIS MO. 337 CLEAR (SCALE 0-3) 13
DPTR FM NORMAL 135 PTCLDY (SCALE 4-7) 17
SEASONAL TOTAL 592 CLOUDY (SCALE 8-10) 1
DPTR FM NORMAL 206
[CDD (BASE 65) ]
TOTAL THIS MO. 1
DPTR FM NORMAL -61 [PRESSURE DATA]
SEASONAL TOTAL 1 HIGHEST SLP 30.46 ON 24
DPTR FM NORMAL -61 LOWEST SLP 29.82 ON 1
Temperature is measured electronically. High or low
temperatures for the day may be estimated when necessary. Temperatures are
measured in degrees and tenths fahrenheit, and reported as whole degrees,
rounding down from .4 and up from .5
Precipitation is measured mechanically by a tipping-bucket rain gage.
Rainfall may be estimated when necessary using nearby official gages.
NWS measures in inches, tenths and hundredths.
A "T" value is used to indicate a trace, which is precipitation of less than
0.01 inch. Wind is measured mechanically,
reported in MPH in this form. The observation systems report 2-minute
winds and gusts. Direction is expressed in degrees of azimuth.
For example, 360 is due North, 270 is due West. This is the direction
from which the wind was blowing. "SKY" refers to
the amount of sky, in tenths, covered by clouds. This is
determined electronically using a laser-beam ceilometer and algorithms which
calculate sky coverage. Higher-level clouds (above 12,000 feet) will
generally not be considered in finding this value.
"DEP" Departure from Normal indicates whether the
average temperature for the day was either above or below normal for the
date. A positive value (no sign) indicates temperatures was above, and
a negative is below. "CDD" and "HDD"
refers to degree days.
Degree day is a quantitative index
demonstrated to reflect demand for energy to heat or cool houses and
businesses. This index is derived from daily temperature observations at
nearly 200 major weather stations in the contiguous United States. The
"heating year" during which heating degree days are accumulated extends from
July 1st to June 30th and the "cooling year" during which cooling degree
data are accumulated extends from January 1st to December 31st. A mean daily
temperature (average of the daily maximum and minimum temperatures) of 65�F
is the base for both heating and cooling degree day computations. Heating
degree days are summations of negative differences between the mean daily
temperature and the 65�F base; cooling degree days are summations of
positive differences from the same base. For example, cooling degree days
for a station with daily mean temperatures during a seven-day period of
67,65,70,74,78,65 and 68, are 2,0,5,9,13,0,and 3, for a total for the week
of 32 cooling degree days.
Averages are
taken by adding the daily values and dividing by number of days in the month.
Weather - Days
With... The number of days during the month where rainfall met or
exceeded the indicated values.
No of Days With...
The number of days during the month where maximum or minimum temperatures
met or exceeded the indicated values.
Sea-level pressure... The atmospheric pressure
at mean sea level, either directly measured or, most commonly, empirically
determined from the observed station pressure. |
National Weather Service Forecast Office
