----------------------------------------------------------------------------- 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 May 1996. Time is EST/EDT. ----------------------------------------------------------------------------- D HT DN LT DN MT DN HDD CDD PREC WD WS SC WXR TYPE/REMARKS ----------------------------------------------------------------------------- 1 70 -5 47 -6 58.5 -6 6.5 E 25 SU COOLER 2 77 +3 52 0 64.5 +1 0.5 NE 21 PC H-K 3 83 +8 56 +3 69.5 +6 4.5 SSE25 SU K H- 4 87 +14 62 +8 74.5 +11 9.5 W 31 SU HUMID BREEZY 5 76 +4 58 +4 67.0 +4 2.0 ESE22 PC FROPA BREEZY 6 70 -5 57 +3 63.0 -1 2.0 .83 S 29 PC TRW+(AM) FROPA 7 57 -17 51 -3 54.0 -10 11.0 .84 E 24 C R L F COOLER 8 67 -7 53 -1 60.0 -4 5.0 .02 SSE19 PC RW- F 9 79 +5 57 +4 68.0 +5 3.0 T NNE21 PC F RW H 10 88 +11 56 +2 72.0 +7 7.0 WSW25 PC F(AM) H- 11 88 +10 68 +12 78.0 +11 13.0 .09 WSW55 PC HOT HUMID SQUALL LINE/ TRW (EVE) 12 68 -10 54 -3 61.0 -7 4.0 .03 NNW27 PC RW-(AM) FROPA COOLER 13 64 -14 49 -8 56.5 -11 8.5 E 19 PC BREEZY COOLER 14 63 -13 47 -11 55.0 -12 10.0 .04 N/SE18 PC RW-(AM) 15 70 -7 44 -13 57.0 -10 8.0 .21 SSE21 PC R-(PM) 16 69 -8 56 0 62.5 -4 2.5 .61 SW 19 C R-F RW 17 80 +2 62 +4 71.0 +3 6.0 T ESE16 PC F RW- H HUMID 18 90 +10 64 +5 77.0 +8 12.0 WSW14 PC FH HOT HUMID 19 97 +18 67 +8 82.0 +13 17.0 WSW14 SU FH(EARLY AM) HOT HUMID 20 98 +22 70 +11 84.0 +16 19.0 WSW20 SU HOT 21 93 +14 71 +11 82.0 +12 17.0 WSW23 PC H HOT BREEZY 22 79 +1 63 +5 71.0 +3 6.0 NNE35 PC DST LTG FROPA COOLER 23 85 +3 58 -2 71.5 0 6.5 SSE21 SU 24 86 +5 65 +3 75.5 +4 10.5 SSE25 PC H DST LTG 25 71 -9 61 0 66.0 -4 1.0 .10 NE 19 C FROPA TRW F 26 72 -6 60 -1 66.0 -4 1.0 .02 SE 19 C RW F 27 67 -10 58 -1 62.5 -5 2.5 .86 SE 30 C F RW TRW(2) L 28 63 -15 58 -1 60.5 -8 4.5 .16 ESE16 C F RW(AM) COOL FROP 29 65 -17 57 -5 61.0 -11 4.0 T ENE19 C F L- 30 67 -14 53 -9 60.0 -12 5.0 .09 NNE26 PC RW-(AM) F FROPA 31 71 -13 47 -16 59.0 -15 6.0 .00 SE 20 SU RECORD LOW TEMP ----------------------------------------------------------------------------- SUMMARY OF MAY 1996: TEMPERATURE: Monthly mean: High = 76.1 Low = 57.5 Mean = 66.8 Departure < Normal: High = -1.4 Low = +0.2 Mean = -0.6 Degree Days: Heating = 79.5 Cooling = 135.0 Number of Days Using: Heating = 15 Cooling = 16 Days with maximum temperature >= 90: 4 Days with maximum temperature <= 32: 0 Days with minimum temperature <= 32: 0 Days with minimum temperature <= 0: 0 PRECIPITATION: Total month = 3.90" Departure < Normal = - 0.20" Normal month (to date) 4.10" or 95% Average daily = 0.13" Normal daily = 0.13" Number of days with measurable precipitation = 13 Year-to-date = 21.25" Departure = +1.60" 108% 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: 13 Snowfall Number of days with 0.10" or more: 7 May total = 0.00" Number of days with 0.50" or more: 4 May maximum = 0.00" Number of days with 1.00" or more: 0 DAILY EXTREMES: Low temperature = 44 on the 25th High temperature = 98 on the 20th Maximum daily precipitation = 0.86" on the 27th Maximum 24-hour rainfall = 1.67" on the 6-7th Maximum wind gust = WSW 55 mph on the 11th Maximum barometric pressure = 30.417" on the 7th Minimum barometric pressure = 29.636" on the 21st NUMBER OF: Days Cloudy: 8 Days with thunderstorms: 4 Days Partly Cloudy: 16 # of Thunderstorms: 5 Days Clear/Sunny: 7 Days with some type of snowfall: 0 Days with Fog/Ground fog: 13 ---------------------------------------------------------------------------- YEAR-TO-DATE: (through May 31st, 1996) Temperatures Degree Days Precipitation Mean maximum: 60.1 (-1.1) Heating: 2384.5 Aqueous: 21.25" (DEP +1.61") Mean minimum: 41.1 (-0.6) Cooling: 194.5 Maximum monthly: 5.60"/JAN. Mean monthly: 50.6 (-0.9) 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: 4 Maximum monthly: 8.00"/FEB. Days with maximum temperature <= 32: 27 Seasonal total: 16.20" Days with minimum temperature <= 32: 48 Days with some type of Days with temperature <= 0: 0 snowfall: 15 Days with measurable Number of: precipitation: 64 or 42% Days using Heating: 124 Days using Cooling: 28 Days with thunderstorms: 9 Days Cloudy: 35 Number of thunderstorms: 10 Days Partly Cloudy: 95 Days Clear/Sunny: 22 Greatest 24-hour period Days with fog/ground fog: 55 rainfall: 1.69"/Jan. 6-7th Wind (Highest Recorded Wind Gust): SSW 64 miles per hour, JAN. 19 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. -----------------------------------------------------------------------------