BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, NOVEMBER 1, 2012 ALL TIMES ARE IN EASTERN STANDARD TIME OCTOBER WARMER BUT ONLY SLIGHTLY DRIER THAN THE 30-YEAR NORMAL OCTOBER 2012 PRELIMINARY STATS TEMPERATURE: Average Max Temp: 62.5F [+2.2F] Average Min Temp: 47.0F [+4.1F] Mean Temp: 54.8F [+3.2F] 24-hr. Corr. Mean Temp: 54.4F Max Temp: 77F on 6th Min Temp: 29F on 13th Total heating degree day units (month): 309 [-112] Total heating degree day units (season): 408 [-155] *start July 1 PRECIPITATION: Total precipitation: 4.58 ins. [-0.11 in.] Greatest 24-hr precipitation: 2.42 ins. on 28th/29th Total snowfall: 0.0 inch [-0.2 inch] *using 1891-2000 normals WIND: Avg wind speed: 11.9 MPH Avg corrected wind speed: 12.3 MPH Prevailing wind direction: W [14%] Peak gust: 76 MPH E on 29th Peak fastest mile: 58 MPH E on 29th SUNSHINE: Total astronomical minutes: 9,193 of possible 20,551 or 45% Today's observations: 7 A.M. Weather: Broken dense cirrus, overcast cirrus, few stratocumulus distant NE and distant S, higher cirrus layer partly thin, few small breaks in overcast Temperature: 42F; Dew Point: 37F; Wind: SW at 8 kts. Sea-level pressure: 29.57 ins. Hg, rising then more slowly Visibility: 25 miles, except SE-S 35 miles, hazy all quadrants 6-hour min. temp: 42F 24-hour precip: trace BHO SA 1155 E220 BKN 250 OVC 25 013/42/37/2208/957/ FEW SC DSNT NE AND DSNT S FEW ACSL ALQDS DNS CI ALQDS OVC PTLY THN FEW SML BINOVC VSBY SE-S 35 HAZY ALQDS/ 8/542 51009 10046 20042 10 A.M. Weather: Scattered cumulus forming all quadrants, thin broken cirrus, 2 levels Temperature: 50F; Dew Point: 38F; Wind: SW at 12 kts, Wind: Direction variable S-W Sea-level pressure: 29.57 ins. Hg, falling slightly Visibility: 55 miles, light distant haze BHO SA 1455 27 SCT 250 –BKN 300 –BKN 55 012/50/38/2212/957/ CU FRMG ALQDS LGT DSNT HZ WND 19V27/ 8/101 58001 1 P.M. Weather: Scattered cumulus, stratocumulus formed by the spreading out of cumulus, scattered altocumulus lenticularis, scattered cirrus Temperature: 53F; Dew Point: 39F; Wind: SW at 10 kts, Sea-level pressure: 29.52 ins. Hg, falling then more rapidly Visibility: 55 miles, light distant haze 6-hour max. temp: 56F 6 hour min. temp. 42F BHO SA 1755 30 SCT 120 SCT 250 SCT 55 996/53/39/2210/952/ CU/SCCU ALQDS FEW ACSL NW LGT DSNT HZ WND 19V29/ 8/441 58016 10056 20042 WEATHER SUMMARY FOR WEDNESDAY, OCTOBER 31 TEMPERATURE (DEGREES F) MAX.....55 NORMAL.....55 MIN.....45 NORMAL.....38 MEAN....50 NORMAL.....47 DEPARTURE FROM 30-YEAR NORMAL.....................+3 TOTAL DEPARTURE FOR THE MONTH...................+107 [+3.2 DEGREE/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............15 DEPARTURE........-3 TOTAL HEATING UNITS FOR THE MONTH...........309 DEPARTURE......-112 TOTAL HEATING UNITS FOR THE SEASON..........408 DEPARTURE......-155 TOTAL HEATING UNITS LAST SEASON TO DATE.....426 DIFFERENCE......-10 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............30 SW AT 9:06 A.M. AERO..................30 SW AT 9:06 A.M. ASOS..................30 SW AT 9:05 A.M. DAVIS.................29 SSW AT 9:05 A.M. RMY 30 THE FASTEST MILE FOR YESTERDAY...........21 SSW AT 9:06 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE............21 SSW AT 9:08 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........21 SSW AT 9:07 A.M. AVERAGE WIND SPEED AND DIRECTION...... 10.3 SSW ASOS................10.1 DAVIS................9.6 S [190 deg] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...Trace DEPARTURE..........-0.16 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........4.58 DEPARTURE..........-0.11 ASOS..............4.63 TOTAL PRECIPITATION FOR THE YEAR..........33.20 DEPARTURE.........-10.57 ASOS.............33.18 PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 2012 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust RMY: RMY = R.M. Young wind gust recording system added 8/9/2011 TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 10/1 66/47/57/0/T/429/61 36 W AERO 35 MPH WSW RMY 36 10/2 69/53/61/+4/0.12/098/14 18 W AERO 16 MPH W RNT 16 10/3 62/58/60/+4/0.02/000/00 20 NE AERO 18 MPH NE RMY 18 10/4 61/58/60/+4/0.08/000/00 17 NNE AERO 14 MPH NE RMY 14 10/5 75/57/66/+10/0.00/623/90 20 SW AERO 19 MPH SW RMY 21 10/6 77/48/63/+8/0.20/269/39 36 SSW AERO 37 MPH SSW RMY 36 TSTM 10/7 57/44/51/-4/0.15/185/27 21 WNW AERO 18 MPH WNW RMY 19 10/8 55/40/48/-6/0.00/328/48 17 WNW AERO 15 MPH WNW RMY N/A 10/9 56/49/53/-1/T/000/00 27 E AERO 25 MPH ENE RMY 25 10/10 60/47/54/0/0.22/000/00 36 WNW AERO 36 MPH WNW RMY 31 10/11 58/41/50/-3/0.00/668/99 35 WNW AERO 33 MPH WNW RMY 34 10/12 51/34/43/-10/0.04/296/44 32 WNW AERO 30 MPH NW RMY 30 10/13 52/29/41/-12/0.00/582/87 22 SSW AERO 20 MPH WNW RMY N/A 10/14 66/43/55/+3/0.09/167/25 40 SW AERO 39 MPH SW RMY 39 10/15 73/58/66/+14/0.03/279/42 43 SSW AERO 43 MPH SSW RMY 43 10/16 61/40/51/0/0.03/522/79 38 WNW AERO 36 MPH WNW RMY 38 10/17 60/35/48/-3/0.00/612/93 22 NW AERO 18 MPH NW RMY N/A 10/18 66/46/56/+5/0.00/636/97 25 ESE AERO 23 MPH ESE RMY 25 10/19 66/51/59/+9/0.20/007/01 39 SSE AERO 38 MPH SSE RMY 39 10/20 73/53/63/+13/0.11/377/58 33 SSW AERO 32 MPH SSW RMY 34 TSTM 10/21 63/45/54/+4/0.00/564/87 36 WNW AERO 32 MPH WNW RMY 34 10/22 65/46/56/+7/0.00/632/98 37 WNW AERO 35 MPH WNW RMY 36 10/23 64/46/55/+6/0.00/398/62 27 NW AERO 24 MPH NW RMY 26 10/24 53/46/50/+1/T/000/00 21 NNE AERO 20 MPH NNE RMY N/A 10/25 62/46/54/+5/0.00/618/97 17 S AERO 16 MPH SW RMY 17 10/26 67/49/58/+10/0.00/507/80 17 S AERO 16 MPH S RMY 16 10/27 65/50/58/+10/0.00/228/36 22 NNE AERO 20 MPH NNE RMY 22 10/28 54/49/52/+4/0.35/000/00 45 ENE AERO 46 MPH ENE RMY N/A 10/29 61/51/56/+9/2.42/000/00 76 E AERO 82 MPH E RMY N/A 10/30 66/53/60/+13/0.50/162/26 36 SSW AERO 36 MPH SSE RMY 36 10/31 55/45/50/+3/0.02/006/01 30 SW AERO 30 MPH SW RMY 30 11/1 morning low temp: 42F; the normal low is now 38F DAILY RECORDS FOR OCTOBER 2012 10/13 - NEW DAILY RECORD LOW MINIMUM TEMPERATURE OF 29F; surpasses previous record of 30F set in 1934, 1936, 1988 10/29 - NEW DAILY RECORD PEAK WIND GUST OF 76 MPH E; surpasses previous record of 69 mph S in 2003 10/29 - NEW DAILY RECORD MAXIMUM PRECIPITATION OF 2.42 INCHES; surpasses previous record of 2.27 inches in 1953 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR NOVEMBER 1 HIGH 75 IN 2003 LOW 22 IN 1913,1923 PRECIP 2.93 INCHES IN 1985 SNOWFALL TRACE IN 1906,1951 PEAK GUST 78 ESE IN 1997 RECORDS FOR NOVEMBER 2 HIGH 81 IN 1950 LOW 22 IN 1965 PRECIP 1.67 INCHES IN 1970 SNOWFALL 0.2 IN 1906,1951 PEAK GUST 63 WSW IN 1973 TODAY'S REPORT PREPARED BY: Robert Skilling