BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, OCTOBER 2, 2012 ALL TIMES ARE IN EASTERN STANDARD TIME TEMPERATURES WARMING ON SOUTHERLY WINDS; RAIN MOVES IN THIS AFTERNOON Despite mostly cloudy sky conditions today, temperatures have warmed several degrees compared to yesterday. Light, SSW-SW winds are transporting a warmer, more moist air mass into the region. The dew point temperature has climbed to near 60F late this afternoon. The high temperture for the day reached 69F before rain cooled things off this afternoon. Light rain showers began shortly after 12 PM EST, becoming a steady light rain shortly before 1 PM EST. Through 3 PM EST, a few hundreths of an inch of rainfall have been observed on the summit, with light rain continuing. SEPTEMBER 2012 PRELIMINARY STATS TEMPERATURE: Average Max Temp: 71.5F [-0.1F] Average Min Temp: 54.8F [+0.2F] Mean Temp: 63.2F [+0.1F] 24-hr. Corr Mean Temp: 62.5F Max Temp: 85F on 7th Min Temp: 45F on 24th Total heating degree day units (month): 99 [-18] Total heating degree day units (season): 99 [-43] *start July 1 PRECIPITATION:Total precipitation: 3.27 ins. [-0.79 in.] Greatest 24-hr precipitation: 1.03 ins. on 18th/19th WIND: Avg wind speed: 10.8 MPH Avg corrected wind speed: 11.3 MPH Prevailing wind direction: S [16%] Peak gust: 60 MPH S on 18th Peak fastest mile: 47 MPH S on 18th SUNSHINE: Total astronomical minutes: 12,680 of possible 22,440 or 57% Today's observations: 7 A.M. Weather: Scattered altocumulus, broken altocumulus, broken cirrostratus, broken cirrus, altocumulus lenticularis all quadrants, few altocumulus castellanus distant S and distant W, thin smoke layer along horizon NNW-ENE and SSE-SSW, light distant haze Temperature: 57F; Dew Point: 51F; Wind: WSW at 9 kts. Sea-level pressure: 30.04 ins. Hg, rising Visibility: 70 miles, light distant haze 24-hour precip: Trace 6-hour min. temp: 53F BHO SA 1155 80 SCT E100 BKN 200 BKN 250 BKN 70 173/57/51/2509/004/ ACSL ALQDS FEW ACC DSNT S AND DSNT W THN K LYR ALG HRZN NNW-ENE AND SSE-SSW LGT DSNT HZ/ 8/087 53014 MANUAL 7000/ 10057 20053 10 A.M. Weather: Scattered altocumulus, broken altocumulus, broken cirrostratus, broken cirrus, few altocumulus lenticularis all quadrants, few altocumulus castellanus distant SE-SSW, thin smoke layer distant N-ENE and distant SE-SSW, light distant haze Temperature: 65F; Dew Point: 54F; Wind: SW at 5 kts, Wind: Light and variable Sea-level pressure: 30.06 ins. Hg, rising Visibility: 65 miles, light distant haze BHO SA 1455 80 SCT E100 BKN 200 BKN 250 BKN 65 179/65/54/2305/006/ FEW ACSL ALQDS FEW ACC DSNT SE-SSW THN K LYR DSNT N-ENE AND DSNT SE-SSW LGT DSNT HZ WND LGT AND VRB/ 8/087 51006 1 P.M. Weather: Light rain, scattered stratocumulus, broken altocumulus, broken altostratus, lower stratocumulus and stratocumulus lenticularis WNW-NNE, breaks in overcast distant E-SSE, altocumulus lenticularis distant ENE-SSE few altocumulus castellanus distant SSE, thin smoke layer distant NE-ENE, distant haze, rain shower SSW-NW-NE moving E, occasional light rain showers began at 12:03 PM EST very light and intermittent, steady light rain began at 12:55 PM EST and continued Temperature: 68F; Dew Point: 55F; Wind: SSW @ 6 kts. Sea-level pressure: 30.04 ins. Hg, falling Visibility: 35 miles, 50 miles E-S, 25 miles SW-N, light rain and distant haze 6-hour precip: Trace 6-hour max. temp: 69F BHO SA 1755 40 SCT E100 BKN 160 OVC 35R- 174/68/55/2106/004/ LWR SC AND SCSL WNW-NNE BINOVC DSNT E-SSE ACSL DSNT ENE-SSE FEW ACC DSNT SSE THN K LYR DSNT NE-ENE DSNT HZ VSBY 50 E-S 25 SW-N SHRA SSW-NW-NE MOVG E OCNL RW-B03 VRY LGT AND INTMT R-B55 CTD/ 8/58/ 58005 MANUAL 6000/ 10069 20057 WEATHER SUMMARY FOR MONDAY, OCTOBER 1 TEMPERATURE (DEGREES F) MAX.....66 NORMAL.....66 MIN.....47 NORMAL.....49 MEAN....57 NORMAL.....57 DEPARTURE FROM 30-YEAR NORMAL......................0 TOTAL DEPARTURE FOR THE MONTH......................0 [0.0 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............8 DEPARTURE.........0 TOTAL HEATING UNITS FOR THE MONTH.............8 DEPARTURE.........0 TOTAL HEATING UNITS FOR THE SEASON..........107 DEPARTURE.......-44 TOTAL HEATING UNITS LAST SEASON TO DATE......77 DIFFERENCE......+30 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............36 W AT 11:24 A.M. * AERO..................35 WSW AT 11:46 A.M. ASOS..................36 W AT 11:24 A.M. DAVIS.................35 W AT 11:17 A.M. RMY 36 THE FASTEST MILE FOR YESTERDAY...........27 WSW AT 11:46 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE............28 W AT 11:19 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........27 W AT 11:19 A.M. AVERAGE WIND SPEED AND DIRECTION.......15.2 WSW ASOS................14.1 DAVIS...............13.7 WSW [243 deg] * Last of several occurrences 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.........Trace DEPARTURE...........-0.16 ASOS..............0.00 TOTAL PRECIPITATION FOR THE YEAR..........28.62 DEPARTURE..........-10.62 ASOS.............28.55 PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER & 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 9/1 75/60/68/0/0.00/637/81 27 ENE AERO 25 MPH ENE RMY 23 9/2 80/60/70/+2/0.00/455/58 21 ENE AERO 20 MPH ENE RMY 20 9/3 76/57/67/0/0.00/485/62 20 SE AERO 20 MPH S RMY 21 9/4 72/62/67/0/0.40/000/00 25 S AERO 23 MPH S RMY N/A 9/5 79/64/72/+5/0.31/171/22 33 SSW AERO 35 MPH SSW RMY 33 9/6 77/62/70/+3/0.00/279/36 20 SSW AERO 20 MPH SSW RMY 19 9/7 85/66/76/+10/0.00/463/60 22 SSW AERO 20 MPH SSW RMY N/A TSTM 9/8 81/62/72/+6/0.38/453/59 45 S AERO 45 MPH S RMY 45 9/9 72/58/65/-1/0.02/283/37 25 WNW AERO 23 MPH WNW RMY N/A 9/10 66/50/58/-7/0.00/313/41 33 NW AERO 32 MPH NW RMY 34 9/11 71/47/59/-6/0.00/714/94 23 NW AERO 21 MPH WNW RMY N/A 9/12 77/53/65/0/0.00/719/95 20 S AERO 18 MPH S RMY 18 9/13 81/59/70/+6/0.00/731/97 21 S AERO 18 MPH S RMY 19 9/14 81/59/70/+6/0.00/706/94 25 S AERO 23 MPH S RMY 23 9/15 72/54/63/-1/0.07/441/59 28 NW AERO 27 MPH WNW RMY 27 9/16 70/49/60/-3/0.00/731/98 23 W AERO 20 MPH W RMY 21 9/17 74/51/63/0/0.00/698/94 20 S AERO 17 MPH S RMY N/A 9/18 74/58/66/+4/0.13/044/06 60 S AERO 62 MPH S RMY 63 9/19 70/53/62/0/0.90/472/64 55 S AERO 56 MPH S RMY N/A 9/20 63/50/57/-5/0.00/539/87 24 NE AERO 21 MPH NE RMY 21 9/21 63/48/56/-5/0.01/241/33 18 E AERO 16 MPH E RMY 16 9/22 70/55/63/+2/0.04/306/42 28 S AERO 25 MPH S RMY 27 9/23 69/50/60/0/0.02/653/90 27 WNW AERO 24 MPH WNW RMY 27 9/24 66/45/56/-4/0.00/694/96 23 WSW AERO 21 MPH WSW RMY 22 9/25 72/48/60/0/0.00/691/96 35 SSW AERP 35 MPH SW RMY 36 9/26 70/57/64/+5/T/050/07 31 S AERO 32 MPH S RMY 32 9/27 70/53/62/+3/0.00/557/78 24 NNW AERO 23 MPH NNW RMY 23 9/28 56/53/55/-3/0.64/000/00 29 ESE AERO 29 MPH ESE RMY 30 9/29 56/51/54/-4/0.13/000/00 28 NNE AERO 25 MPH NNE RMY N/A 9/30 57/50/54/-4/0.22/054/08 23 SSW AERO 23 MPH SSW RMY N/A 10/1 66/47/57/0/T/.../.. 36 W AERO 35 MPH WSW RMY 36 10/2 morning low temp: 53F; the normal low is now 48F DAILY RECORDS FOR SEPTEMBER 2012 9/19 - NEW RECORD PEAK WIND GUST OF 55 MPH S; surpasses previous record of 49 MPH NE IN 1972 DAILY RECORDS FOR OCTOBER 2012 None so far. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR OCTOBER 2 HIGH 85F IN 1968 LOW 29F IN 1899 PRECIP 1.75 INCHES IN 1984 PEAK GUST 52e MPH S IN 1952, 52 NNW IN 1984 RECORDS FOR OCTOBER 3 HIGH 82F IN 1922 LOW 28F IN 1899 PRECIP 1.76 INCHES IN 1979 PEAK GUST 62 MPH WNW IN 1964 TODAY'S REPORT PREPARED BY: Sean Fankhauser