May & Yearly 1999
Graphs follow the text summary!
FRI, JUNE 4, 1999 8:00 PM EDT
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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 May 1999.
Time is EDT.
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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*56 -18 49 -4 52.5 -11 12.5 T NNE29 NNE11.2 C -DZ WINDY
*TIED MINIMUM HIGH TEMPERATURE
2*54 -19 50 -2 52.0 -11 13.0 .72 NNE29 N11.0 C RA BR WINDY
*NEW STATION MINIMUM HIGH TEMPERATURE
3*58 -16 51 -2 54.5 -9 10.5 .04 N23 N7.8 C DZ -SHRA BREEZY BR
*NEW STATION MINIMUM HIGH TEMPERATURE
4 75 +2 53 -1 64.0 0 1.0 .01 W17 N4.8 PC -SHRA(AM) BR
5 80 +8 55 +1 67.5 +4 2.5 .08 W16 SSE3.3 PC -SHRA(EVE)BR
6 80 +4 64 +9 72.0 +7 7.0 .08 S14 S4.0 PC SHRA -BR
7 88 +13 66 +12 77.0 +12 12.0 .01 W20 S5.8 PC -SHRA BR
8 85 +11 *69 +15 77.0 +13 12.0 SSW28 SSW7.1 PC DRIER FROPA(EVE)
*NEW STATION MAXIMUM LOW TEMPERATURE
9 85 +11 59 +6 72.0 +8 7.0 W18 SE2.8 SU PLEASANT
10 79 +3 62 +7 70.5 +5 5.5 NNE17 NNE4.2 SU
11 79 +2 56 +1 67.5 +1 2.5 NNE14 SSE2.6 SU -BR(AM)
12 83 +5 56 0 69.5 +3 4.5 S14 SSE3.0-PC -BR(AM)
13 75 -2 60 +3 67.5 +1 2.5 .82 NNE18 NE3.4 PC SHRA BR
14 61 -14 56 -1 58.5 -8 6.5 .14*NNE28 NNE8.8 C SHRA BR BREEZY
*NEW STATION DAILY MAXIMUM WIND SPEED
15*59 -17 55 -2 57.0 -10 8.0 .41 NNE28 NNE10.4 C -RA BR DZ BREEZY
*NEW STATION DAILY MINIMUM MAX TEMP
16 65 -12 57 +1 61.0 -5 4.0 .03 NNE24 NNE8.3 C DZ BR -RA BREEZY
17 70 -8 59 +1 64.5 -3 0.5 .15 NNE18 NNE6.4 PC DZ -RA BR
18 72 -8 61 +2 66.5 -3 1.5 T NE18 NNE5.6 PC -DZ BR
19 73 -7 64 +5 68.5 -1 3.5 .11 N18 NNE4.7 PC BR FROPA SHRA
20 74 -3 59 -1 66.5 -2 1.5 N20 N4.8 SU
21 81 +2 54 -6 67.5 -2 2.5 W14 NE3.2 SU
22 88 +10 60 +2 74.0 +6 9.0 .33 N19 S5.0 PC WARM TSRA
23 85 +4 65 +5 75.0 +4 10.0 .11 S21 S4.8 PC SHRA(AM)
24 83 +2 63 +1 73.0 +2 8.0 .22 SSW28 SSW6.3 PC TSRA(AFT) FROPA
25 81 +1 56 -5 68.5 -2 3.5 W21 W2.8 PC
26 75 -3 64 +3 69.5 0 4.5 .02 S20 S2.7 PC SHRA
27 74 -2 60 +1 67.0 -1 2.0 N21 N5.3 SU FROPA(AM)
28 81 +3 56 -3 68.5 0 3.5 N16 NNE1.7 SU -BR(AM)
29 89 +7 61 0 75.0 +3 10.0 S14 S2.4 SU WARM DRY
30 92 +10 63 +1 77.5 +5 12.5 W13 S3.0 SU HOT DRY
31 90 +6 65 +1 77.5 +4 12.5 S13 S4.5 PC WARM DRY
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SUMMARY OF MAY 1999:
TEMPERATURE:
Monthly mean: High = 76.5 Low = 59.0 Mean = 67.7
Departure < Normal: High = -0.8 Low = + 1.6 Mean = +0.3
Degree Days: Heating = 56.0 Cooling = 140.0
Num er of Days Using: Heating = 8 Cooling = 23
Days with maximum temperature >= 90: 2
Days with maximum temperature <= 32: 0
Days with minimum temperature <= 32: 0
Days with minimum temperature <= 0: 0
PRECIPITATION:
Total month = 3.28" Departure from Normal = - 0.70"
Normal month (to date) = 3.98" or 82%
Average daily = 0.11"
Normal daily = 0.13"
Number of days with measurable precipitation = 16
Year-to-date = 14.71" Departure = - 4.61" or 76% of normal
Maximum for May = 8.06" in 1988 --> (Since
Minimum for May = 1.02" in 1986 --> (1977)
Number of days with 0.01" or more: 16 Snowfall
Number of days with 0.10" or more: 9 May total = 0.00"
Number of days with 0.50" or more: 2
Number of days with 1.00" or more: 0 May max = 0.0"
DAILY EXTREMES: Low temperature = 49 on the 1st
High temperature = 92 on the 30th
Maximum daily precipitation = 0.82" on the 13th
Maximum 24-hour rainfall = 0.82" on the 13th
Maximum barometric pressure = 30.250" on the 30th
Minimum barometric pressure = 29.572" on the 24th
Frozen precip = 0.00"
WIND:
Maximum wind gust = NNE 29 MPH on the 1st and 2nd
NUMBER OF:
Days Cloudy: 6 Days with thunderstorms: 2
Days Partly Cloudy: 16 # of Thunderstorms: 2
Days Clear/Sunny: 9 Days with some type of snowfall: 0
Days with Fog/Ground Fog: 16
Days with Dense Fog: 0
Days with Frost: 0
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YEAR-TO-DATE: (through May 31st, 1999)
Temperatures Degree Days Precipitation
Mean maximum: 62.7 (+1.2) Heating: Aqueous: 14.71" (DEP -4.61") 76%
Mean minimum: 44.0 (+1.9) 1935.0 Maximum monthly: 3.29"/MAR.
Mean monthly: 53.4 (+1.6) Cooling: Minimum monthly: 2.14"/FEB.
179.0
Highest: 92, May 30
Snowfall: TRACE"
Lowest: 17, January 6 Maximum daily: TRACE" (Jan. 9,10 & Mar. 8)
Days with max temperature >= 90: 2 Maximum monthly: TRACE" (Jan. & Mar.)
Days with max temperature <= 32: 1
Days with min temperature <= 32: 21 Days with some type of
Days with temperature <= 0: 0 snowfall: 8
Days with measurable
Number of: precipitation: 51 or 33.77%
Days using Heating: 120
Days using Cooling: 31 Days with thunderstorms: 11
Days Cloudy: 45 Number of thunderstorms: 12
Days Partly Cloudy: 78
Days Clear/Sunny: 28 Greatest 24-hour daily rainfall:
Days with fog/ground fog: 57 1.39"/April 11th, 1999
Days with dense fog: 3
Wind (Highest Gust): SSW 54 miles per hour, March 3rd
Barometer: Highest 30.807" on January 31st
Lowest: 29.370" on April 9th
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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;
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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