----------------------------------------------------------------------------- MONTHLY SUMMARY OF CLIMATOLOGICAL DATA - PORTSMOUTH, VIRGINIA Portsmouth Weather Records Service Portsmouth, Virginia 23702-2017 (3 miles south / West Cradock Section) ----------------------------------------------------------------------------- Monthly summary of Local Climatological Data for Portsmouth, Virginia, West Cradock Section, during the month of December, 1995. Time is EST. ----------------------------------------------------------------------------- D HT DN LT DN MT DN HDD CDD PREC WD WS SC WXR TYPE/REMARKS ----------------------------------------------------------------------------- 1 61 +3 33 -7 47.0 -2 18.0 SW 35 SU BREEZY 2 55 -4 43 +4 49.0 0 16.0 N 22 SU FROPA 3 70 +13 36 -2 53.0 +5 12.0 SSW28 PC MILD 4 57 0 38 0 47.5 0 17.5 0.01 NNE23 PC FROPA R- 5 58 +3 34 -3 46.0 0 19.0 T S 19 PC FROST (AM) F R-- 6 54 -4 41 +4 47.5 0 17.5 NNE23 PC COOL 7 46 -9 29 -7 37.5 -8 27.5 0.34 NNE30 PC R IP S SG F FROPA 0.30" ACCUMULATION 8 42 -13 26 -10 34.0 -11 31.0 NE 19 SU FR COLD 9 49 -7 38 +2 43.5 -2 21.5 0.62 NW 25 C R F FROPA 10 40 -15 25 -10 32.5 -10 32.5 NW 27 SU FROPA BLUSTERY COLDER 11 33 -17 22 -13 27.5 -15 37.5 WNW27 -PC COLD 12 42 -9 26 -9 34.0 -9 31.0 SW 14 PC 13 50 -4 29 -8 39.5 -6 25.5 SE 14 C 14 65 +12 40 +5 52.5 +9 12.5 SW 25 PC 15 70 +15 47 +11 58.5 +12 6.5 ESE17 PC GF F MILD 16 57 +5 37 +1 47.0 +3 18.0 0.19 NW 33 PC F R RW FROPA F (EVE) 17 42 -9 30 -4 36.0 -7 29.0 N 22 PC F(AM) BREEXY 18 47 -4 29 -4 38.0 -4 27.0 0.05 ENE14 C F R- COLD 19 44 -6 37 +4 40.5 -1 24.5 0.54 NNW20 C F R L FROPA 20 37 -12 28 -6 32.5 -9 32.5 0.01 NNW37 PC RW-(AM) WINDY COLD 21 41 -9 24 -10 32.5 -10 32.5 NNW26 PC BREEZY COLD 22 39 -10 25 -7 32.0 -9 33.0 NNW24 SU BREEZY COLD 23 39 -15 25 -10 32.0 -13 33.0 NNW21 SU BREEZY COLD 24 38 -17 25 -10 31.5 -13 33.5 NNW26 SU BREEZY COLD 25 38 -12 23 -9 30.5 -10 34.5 W 15 PC FROST- (AM) COLD 26 37 -9 26 -5 31.5 -7 33.5 NW 30 SU FROPA 27 39 -6 24 -8 31.5 -7 33.5 NW 26 SU BREEZY COLD 28 39 -14 25 -10 32.0 -12 33.0 NW 23 SU BREEZY COLD 29 43 -7 28 -6 35.5 -7 29.5 N 22 SU NOT SO COLD FR-(PM) 30 53 +5 26 -6 39.5 -1 25.5 SW 18 PC FR (AM) NOT SO COLD 31 53 +2 43 +9 48.0 +6 17.0 0.02 SSE12 C R- L F+ ----------------------------------------------------------------------------- SUMMARY OF DECEMBER 1995: TEMPERATURE: Monthly mean: High = 47.7 Low = 31.0 Mean = 39.4 Departure < Normal: High = -5.0 Low = -4.1 Mean = -4.5 Degree Days: Heating = 795.0 Cooling = 0.0 Number of Days Using: Heating = 31 Cooling = 0 Days with maximum temperature >= 90: 0 Days with maximum temperature <= 32: 0 Days with minimum temperature <= 32: 19 Days with minimum temperature <= 0: 0 PRECIPITATION: Total month = 1.78" Departure < Normal = -1.12" Normal month = 2.90" or 61% Average daily = 0.06" Normal daily = 0.09" Number of days with measurable precipitation = 8 Year-to-date = 42.73" Departure = -3.84" 92% 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 = 0.30" Number of days with 0.50" or more: 2 December maximum = 1.70" Number of days with 1.00" or more: 0 in 1993 DAILY EXTREMES: Low temperature = 22 on the 11th High temperature = 70 on the 3rd & 15th Maximum daily precipitation = 0.62" on the 9th Maximum 24-hour rainfall = 0.62" on the 9th Maximum wind gust = NW 37 mph on the 20th Maximum barometric pressure = 30.46" on the 29th Minimum barometric pressure = 29.42" on the 19th NUMBER OF: Days Cloudy: 4 Days with thunderstorms: 0 Days Partly Cloudy: 17 Thunderstorms: 0 Days Clear/Sunny: 10 Days with some type of snowfall: 1 Days with Fog/Ground fog: 9 --------------------------------------------------------------------------- YEARLY TOTALS: Temperatures Degree Days Precipitation Mean maximum: 69.9 (+0.5) Heating: 3379.5 Aqueous: 42.73" (DEP -3.84") Mean minimum: 51.3 (+0.4) Cooling: 1782.5 Maximum monthly: 8.08"/OCT. Mean monthly: 60.6 (+0.4) Minimum monthly: 1.33"/AUG. Highest: 101, July 24th Snowfall: 0.50" Lowest: 13, February 6th and 7th Maximum daily: 0.30"/DEC. 7 Days with maximum temperature >= 90: 48 Maximum monthly: 0.30"/DEC. Days with maximum temperature <= 32: 02 Days with minimum temperature <= 32: 52 Days with some type of Days with temperature <= 0: 00 snowfall: 6 Days with measurable Number of: precipitation: 107 or 29% Days using Heating: 194 Days using Cooling: 166 Days with thunderstorms: 20 Days Cloudy: 47 Number of thunderstorms: 22 Days Partly Cloudy: 244 Days Clear/Sunny: 74 Greatest 24-hour period Days with fog/ground fog: 96 rainfall: 3.50"/Oct. 21st Wind (Highest Recorded Wind Gust): West 52 miles per hour, NOV. 11 Barometer: Highest 30.60" on March 10th; Lowest: 29.33" on February 4th ---------------------------------------------------------------------------- DENOTATIONS (Weather/sky conditions) Intensity Markings A Hail GF Ground fog RW Rainshower Precipitation: AP Small hail GL Glaze S Snow - Light B Blowing H Haze SG Snow granules + Heavy C Cloudy IP Ice pellets SP Snow pellets Sky Condition: CL Clear K Smoke SU Sunny -Thin or Partial D Dust L Drizzle TRW Thundershower Departures from F Fog LTG Lightning T Thunderstorm Norms: FR Frost PC Partly Cloudy X Obscurred Sky - below; + above R Rain Y Spray ZL Freezing drizzle ZR Freezing rain ----------------------------------------------------------------------------- OTHER DENOTATIONS: NA, not available; NR, not recorded; TEMP, temperature; MAX, maximum; MIN, minimum; T, trace of precipitation; INOP, inopera- tive 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; PM afternoon hours; EVE evening hours; E estimated; VBL, variable wind directions ----------------------------------------------------------------------------- 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 HB High Barometer Reading (Inches) DN Departure from Normal of High, LB Low Barometer Reading (Inches) Low or Mean Temperature SC Dominant Daily Sky Cover HDD Heating Degree Days WXR TYPES Observed Weather Conditions CDD Cooling Degree Days and Remarks ----------------------------------------------------------------------------- NOTES: All temperatures are in degrees fahrenheit. All precipitation measurements are in inches. All wind speeds are in miles per hour. -----------------------------------------------------------------------------