December & Yearly 1999
Graphs follow the text summary!
SAT, JANUARY 1, 2000 9:55 AM EST
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MONTHLY SUMMARY OF CLIMATOLOGICAL DATA - PORTSMOUTH, VIRGINIA
Portsmouth Weather Records Service
Portsmouth, Virginia 23702-2017
(3 miles south / West Cradock Section)
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Monthly summary of Local Climatological Data for Portsmouth,
Virginia, West Cradock Section, during the month of December 1999.
Time is EST.
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D HT DN LT DN MT DN HDD CDD PREC WD WS WAS SC WXR TYPE/REMARKS
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1 *38 -20 30 -10 34.0 -15 31.0 N 25 N 9.0 SU WINDY COLD
*NEW STATION MINIMUM MAXIMUM TEMPERATURE (PREVIOUSLY 39 IN 1976)
2 51 -8 33 -6 42.0 -7 23.0 N 19 N 4.8 SU
3 61 +3 38 0 49.5 +1 15.5 S 13 SW 3.8 PC MILDER
4 70 +12 48 +8 59.0 +10 6.0 W 22 SW 4.8 SU MILDER
5 69 +13 51 +13 60.0 +13 5.0 SSW23 SSW5.5-PC
6 71 +12 49 +11 60.0 +12 5.0 0.69 N 23 S 5.8 C SHRA BR DSTLTG FROPA
7 50 -5 38 +1 44.0 -2 21.0 0.02 N 21 N 5.1 PC -RA BR
8 55 -1 32 -4 43.5 -2 21.5 W 13 WNW1.3 SU -BR(AM) FROST
9 57 +2 35 -2 46.0 0 19.0 W 11 SSW1.8 SU -FROST -BR(AM)
10 68 +13 43 +7 55.5 +10 9.5 0.27 SSW24 S 5.6 PC -BR(AM) SHRA FROPA
11 52 +1 36 0 44.0 +1 21.0 N 31 N 6.0 SU BREEZY(AM)
12 54 +2 31 -5 42.5 -2 22.5 W 12 W 1.2-PC -FROST(AM) FU
13 68 +14 49 +11 58.5 +12 6.5 T SSW18 S 3.4 C
14 69 +17 48 +12 58.5 +14 6.5 0.38 WSW22 WNW5.5 PC SHRA BR FROPA
15 55 0 44 +7 49.5 +4 15.5 SSW13 S 3.0 PC -BR(AM)
16 53 +1 37 +1 45.0 +1 20.0 W 24 W 7.3-PC -BR(AM) BREEZY COLDER
17 54 +2 31 -4 42.5 -1 22.5 W 21 W 4.0-PC -BR(AM)-FROST
18 51 0 38 +4 44.5 +2 20.5 SSW10 SSW1.4 PC -BR FROPA(EVE)
19 55 +4 47 +13 51.0 +9 14.0 0.02 NE 25 NE 7.3 C -RA(EVE) BR
20 68 +18 51 +16 59.5 +17 5.5 0.05 NE 17 N 6.0 C FG+ BR -SHRA
21 51 +1 43 +8 47.0 +4 18.0 0.18 N 27 N 4.4 C BR -RA DZ FROPA
22 44 -6 33 0 38.5 -3 26.5 0.07 N 26 N 5.6 PC SHRA(AM) BE -FROST (PM)
23 46 -8 29 -6 37.5 -7 27.5 W 17 WSW2.9 SU +FROST(AM) BR
24 36 -18 27 -8 31.5 -13 33.5 T N 19 N 5.4 PC -SN FROPA COLD
25 31 -19 24 -8 27.5 -13 37.5 T N 25 N 6.6 PC -SHSN COLD
26 48 +1 23 -8 35.5 -3 29.5 SSW29 SSW7.8 SU BREEZY COLD FROPA(EVE)
27 46 0 28 -5 37.0 -2 28.0 W 16 W 3.6 SU
28 41 -11 32 -4 36.5 -7 28.5 N 15 SSW3.2 PC COLD
29 44 -7 30 -5 37.0 -6 28.0 W 20 WNW5.0 PC FROPA
30 61 +12 35 +2 48.0 +7 17.0 SW 22 SSW8.0 SU BREEZY
31 60 +9 40 +6 50.0 +7 15.0 W 16 SW 4.3 SU FROPA -BR (EVE)
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SUMMARY OF DECEMBER 1999:
TEMPERATURE:
Monthly mean: High = 54.1 Low = 37.2 Mean = 45.6
Departure < Normal: High = +1.1 Low = +1.5 Mean = +1.3
Degree Days: Heating = 600.0 Cooling = 0.0
Number of Days Using: Heating = 31 Cooling = 0
Days with maximum temperature >=100: 0
Days with maximum temperature >= 90: 0
Days with maximum temperature <= 32: 1
Days with minimum temperature <= 32: 11
Days with minimum temperature <= 0: 0
PRECIPITATION:
Total month = 1.68" Departure from normal: - 1.30"
Normal month (to date) = 2.98" or 56%
Average daily = 0.05"
Normal daily = 0.10"
Number of days with measurable precipitation = 8
Year-to-date = 76.28" Departure = +28.29" or 159% of normal
Maximum for December = 5.73" in 1983 -->(Since
Minimum for December = 0.76" in 1988 --> 1976)
Number of days with 0.01" or more: 8 Snowfall
Number of days with 0.10" or more: 4 December total = TRACE
Number of days with 0.50" or more: 1
Number of days with 1.00" or more: 0 December max = 1.7" in 1993
DAILY EXTREMES: Low temperature = 23 on the 26th
High temperature = 71 on the 6th
Maximum daily precipitation = 0.69" on the 6th
Maximum 24-hour rainfall = 0.69" on the 6th
Maximum barometric pressure = 30.480" on the 8th
Minimum barometric pressure = 29.648" on the 28th
Frozen precip = TRACE
WIND:
Maximum wind gust = N 31 MPH on the 11th
Average Wind = N 4.8 MPH
NUMBER OF:
Days Cloudy: 5 Days with thunderstorms: 0
Days Partly Cloudy: 15 # of Thunderstorms: 0
Days Clear/Sunny: 11 Days with some type of snowfall: 2
Days with Fog/Ground Fog: 15
Days with Dense Fog: 1
Days with Frost: 6
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YEAR-TO-DATE: (through December 31st, 1999)
Temperatures Degree Days Precipitation
Mean maximum: 69.9 (+0.3) Heating: Aqueous: 76.28" (DEP +28.29") 159%
Mean minimum: 53.1 (+1.9) 2959.5 Maximum monthly: 21.91"/SEP.
Mean monthly: 61.5 (+1.1) Cooling: Minimum monthly: 1.31"/NOV.
1688.5
Highest: 101, July 6
Snowfall: TRACE"
Lowest: 17, January 6 Maximum daily: TRACE" (Jan. 9,10; Mar. 8;
Dec. 24)
Days with max temperature >= 90: 43 Maximum monthly: TRACE" (Jan.; Mar.; Dec.)
Days with max temperature <= 32: 2
Days with min temperature <= 32: 32 Days with some type of
Days with temperature <= 0: 0 snowfall: 8
Days with measurable
Number of: Precipitation: 119 or 32.60%
Days using Heating: 200
Days using Cooling: 161 Days with thunderstorms: 26
Days Cloudy: 79 Number of thunderstorms: 33
Days Partly Cloudy: 187
Days Clear/Sunny: 99 Greatest 24-hour daily rainfall:
Days with fog/ground fog: 141 7.82"/October 17th, 1999
Days with dense fog: NR Greatest 24-hour period rainfall:
10.03"/October 17th-18th, 1999
Wind (Highest Gust): WNW 60 miles per hour, September 16th
Barometer: Highest 30.807" on January 31st
Lowest: 28.988" on September 16th
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METAR DENOTATIONS:
BC Patches
BL Blowing
BR Fog with visibilites > 5/8 but <=6 statute miles and below
to 5/8 mile
DU Dust (widespread)
DS Duststorm
DZ Drizzle
FC Funnel Cloud
FC+ Tornado/waterspout
FG Fog with visibility <= 5/8 statute miles
FU Smoke
FZDZ Freezing drizzle
FZRA Freezing rain
FZFG Freezing fog
GR Hail
GS Small hail
HZ Haze
IC Ice crystals
PE Ice pellets
PY Spray
RA Rain
SA Sand
SS Sandstorm
PO Sand or dust whirls
SG Snow granules
SH Shower
SHRA Shower of rain
SHSN Shower of snow
SHPE Shower of ice pellets
SHGR Shower with hail
SHGS Shower with small hail
SM Statute miles
SN Snow
SQ Squalls
TS Thunderstorm
TSGR Thunderstorm with hail
TSGS Thunderstorm with small hail
TSPE Thunderstorm with ice pellets
TSRA Thunderstorm with rain
TSSN Thunderstorm with snow
UP Unknown precipitation
VA Volcanic ash
VC Vicinity
VV Used for obscurred sky
METAR Qualifiers: (now placed in FRONT of code)
- Light
+ Heavy
DR Low drifting
M Below (as in -x.x degrees)
MI Shallow
PR Partial
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PWRS DENOTATIONS: SU/CL = Clear sky; PC = Partly cloudy sky; C =
cloudy sky; NA, not available; NR, not recorded; TEMP, temperature;
MAX, maximum; MIN, minimum; T, trace of precipitation; INOP,
inoperative equipment; MPH, miles per hour; DN, departure from normal;
DEP, departure; YR, year; NORM, normal; DST LTG, distant lightning;
FROP or FROPA, frontal passage; AM morning; AFT afternoon hours;
EVE evening hours; PM evening hours; E estimated; OCNL, occasional
VBL, variable wind directions; TS, tropical storm; *tied station record
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COLUMN DENOTATIONS:
D Date PREC Precipitation
HT High Temperature WS Maximum Wind Speed (Gust)
LT Low Temperature WD Direction of Maximum Wind Gust
MT Mean Temperature WAS Average Wind Speed & Dominant
Direction
HB High Barometer Reading (Inches)
DN Departure from Normal LB Low Barometer Reading (Inches)
SC Dominant Daily Sky Cover
HDD Heating Degree Days WXR TYPES Observed Weather
CDD Cooling Degree Days Conditions and Remarks
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NOTES: All temperatures are in degrees fahrenheit. All precipita-
tion measurements are in inches. All wind speeds are in miles per
hour.
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