----------------------------------------------------------------------------- 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 September 1996. Time is EDT. ----------------------------------------------------------------------------- D HT DN LT DN MT DN HDD CDD PREC WD WS SC WXR TYPE/REMARKS ----------------------------------------------------------------------------- 1 82 -3 67 -1 74.5 -2 9.5 NNE23 PC BREEZY 2 85 +1 63 -5 74.0 -2 9.0 WNW16 PC 3 87 +2 71 +1 79.0 +1 14.0 T SSE15 PC GF H- RW- 4 78 -6 73 +4 75.5 -1 10.5 0.22 SSE19 PC H- RW MUGGY 5 82 -7 72 +5 77.0 +1 12.0 0.04 SSE37 PC RW WINDY EVE HURRICANE FRAN APPROACHES FROM SOUTH 6 89 +5 75 +8 82.0 +6 17.0 0.25 SSE60 PC TRW RW WINDY PASSAGE OF TROPICAL STORM FRAN (AM) 7 90 +5 74 +8 82.0 +6 17.0 SSE23 PC HOT HUMID 8 90 +8 72 +5 81.0 +7 16.0 0.46 ESE37 PC F-(AM) H TRW HUMID 9 89 +5 69 +4 79.0 +4 14.0 SSW18 PC DST LTG H F 10 91 +7 71 +4 81.0 +5 16.0 0.53 SSW26 PC F H TRW(2) 11 76 -7 70 +5 73.0 -1 8.0 0.84 SE 16 C F R 12 77 -6 68 +4 72.5 -1 7.5 0.08 WSW13 C F RW 13 82 -1 68 +4 75.0 +2 10.0 NW 17 PC F FROPA 14 75 -7 59 -6 67.0 -7 2.0 S 18 SU 15 78 -3 56 -9 67.0 -6 2.0 WNW20 SU 16 79 -3 58 -7 68.5 -5 3.5 0.10 SSW29 PC GF- RW 17 84 +3 66 +2 75.0 +2 10.0 0.28 NNW29 PC RW FROPA 18 72 -10 60 -5 66.0 -7 1.0 NNW24 PC BREEZY 19 74 -7 55 -8 64.5 -8 0.5 NNW22 SU PLEASANT 20 77 -3 53 -9 65.0 -6 N 16 SU PLEASANT 21 78 -2 57 -5 67.5 -4 2.5 S 18 PC PLEASANT 22 79 0 65 +1 72.0 +1 7.0 0.08 N 22 PC RW (AM) FROPA 23 74 -3 57 -2 65.5 -2 0.5 NNW29 PC 24 78 +2 50 -9 64.0 -4 1.0 SSW20 PC 25 74 -4 65 +4 69.5 0 4.5 NNE23 PC FROPA 26 77 -3 55 -8 66.0 -5 1.0 SE 19 -PC GF (AM) LUNAR ECLIPSE 27 82 +5 61 0 71.5 +2 6.5 S 24 PC GF (AM) 28 82 +6 66 +8 74.0 +7 9.0 T S 28 PC BREEZY RW 29 72 -3 58 0 65.0 -1 0.68 NNE25 C FROPA RW GF 30 74 0 52 -7 63.0 -3 2.0 T E 15 PC GF RW- ----------------------------------------------------------------------------- SUMMARY OF SEPTEMBER 1996: TEMPERATURE: Monthly mean: High = 80.2 Low = 63.5 Mean = 71.9 Departure < Normal: High = -0.9 Low = -0.4 Mean = -0.6 Degree Days: Heating = 3.5 Cooling = 210.0 Number of Days Using: Heating = 3 Cooling = 25 Days with maximum temperature >= 90: 3 Days with maximum temperature <= 32: 0 Days with minimum temperature <= 32: 0 Days with minimum temperature <= 0: 0 PRECIPITATION: Total month = 3.56" Departure < Normal = -0.48" Normal month (to date) 4.04" or 88% Average daily = 0.12" Normal daily = 0.13" Number of days with measurable precipitation = 11 Year-to-date = 44.72" Departure = +7.16" or 119% of normal Maximum for September = 10.29" in 1979 --> (Since Minimum for September = 0.26" in 1978 --> 1976) Number of days with 0.01" or more: 11 Snowfall Number of days with 0.10" or more: 8 September total = 0.00" Number of days with 0.50" or more: 3 September maximum = 0.00" Number of days with 1.00" or more: 0 DAILY EXTREMES: Low temperature = 50 on the 24th High temperature = 91 on the 10th Maximum daily precipitation = 0.84" on the 11th Maximum 24-hour rainfall = 1.00" between the 10th & 11th (5 PM to 5 PM) Maximum wind gust = SSE60 mph on the 6th Maximum barometric pressure = 30.401" on the 30th Minimum barometric pressure = 29.646" on the 13th NUMBER OF: Days Cloudy: 3 Days with thunderstorms: 3 Days Partly Cloudy: 23 # of Thunderstorms: 4 Days Clear/Sunny: 4 Days with some type of snowfall: 0 Days with Fog/Ground Fog: 12 Days with Dense Fog: 0 ---------------------------------------------------------------------------- YEAR-TO-DATE: (through September 30, 1996) Temperatures Degree Days Precipitation Mean maximum: 70.9 (-1.1) Heating: 2393.0 Aqueous: 44.72" (DEP +7.17") Mean minimum: 52.3 (-1.0) Cooling: 1453.0 Maximum monthly: 11.80"/JUL. Mean monthly: 61.6 (-1.0) Minimum monthly: 2.65"/FEB. Highest: 98, May 20th Snowfall: 15.90" Lowest: 8, February 5th Maximum daily: 4.50"/JAN. 6 Days with maximum temperature >= 90: 31 Maximum monthly: 8.00"/FEB. Days with maximum temperature <= 32: 9 Seasonal total: 16.20" Days with minimum temperature <= 32: 45 Days with some type of Days with temperature <= 0: 0 snowfall: 15 Days with measurable Number of: precipitation: 108 or 39% Days using Heating: 129 Days using Cooling: 143 Days with thunderstorms: 38 Days Cloudy: 46 Number of thunderstorms: 51 Days Partly Cloudy: 190 Days Clear/Sunny: 38 Greatest 24-hour period Days with fog/ground fog: 102 rainfall: 3.43"/July 18-19th Wind (Highest Recorded Wind Gust): SSW 64 miles per hour, January 19th Barometer: Highest 30.937" on March 10th; Lowest: 29.196" on March 19th --------------------------------------------------------------------------- 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. -----------------------------------------------------------------------------