BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA MONDAY, OCTOBER 12, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME CLOUDY AND CHILLY WITH A TOUCH OF RAIN IN THE EARLY AFTERNOON... After a rather pleasant weekend, today we've been under cloudy skies with a brisk and chilly east wind. A few light rain showers have moved through early this afternoon, hopefully a precursor to more substantial rain later tonight and tomorrow. After being in the 70s on Saturday, today feels quite chilly with the temperature holding in the low 50s most of the day. An east wind gusting 25-30 mph at times off the ocean has only added to the chill. Visibility has been gradually decreasing as the day moves along with a moistening atmosphere. We started the day observing 60 miles, but has lowered to 35 miles by early this afternoon. The high so far today is 52, 10 degrees below the daily normal of 62F. The low since midnight is 48F, which is 4 degrees above the normal low of 44F. PRELIMINARY STATS FOR SEPTEMBER 2020 TEMPERATURE, Deg. F Avg. Max. 73.2 [+1.6] Avg. Min. 54.9 [+0.3] Mean      64.1 [+1.0] 24-hour corrected mean: 63.6 Max. for month: 82F on the 8th Min. for month: 39F on the 22nd HEATING DEGREE DAYS Total heating units:    95 [-22] Total for the season:   98 [-44] Total for last season:  93 COOLING DEGREE DAYS Total cooling units:     73  [+13] Total for the season:   830  [+233] Total for last season:  680 PRECIPITATION, Inches Total: 1.61 [-2.45] Greatest in 24 hrs: 1.02 ins. on 29th-30th WIND, mph Avg. uncorrected wind speed: 10.6 mph Avg. corrected wind speed:   11.1 mph Prevailing wind direction:   S [20%] Peak gust and direction:     71 S on the 30th SUNSHINE: Campbell-Stokes card minutes: 12150 minutes of a possible 21582 or 56% Astronomical total minutes: 12593 minutes of a possible 22403 or 56% Today's Observations: 7 A.M. Weather: Broken stratocumulus, overcast altostratus/nimbostratus, few breaks in overcast distant NW Temperature: 49F; Dew Point: 38F; Relative Humidity: 65% Wind: ENE at 9G16 kts Sea-level pressure: 30.33 ins. Hg: rising, then more slowly Visibility: 60 miles 6-hr Max temp: 49F 6-hr Min temp: 48F 24-hr Precip: 0.00 ins. BHO SA 1155 E35 BKN 120 OVC 60 272/49/38/0709G16/033/ FEW BINOVC DSNT NW VIRGA ALQDS/ 8/52/ 51007 10049 20048 10 A.M. Weather: Broken stratocumulus, overcast altostratus/nimbostratus Temperature: 51F; Dew Point: 40F; Relative Humidity: 65% Wind: E at 14G20 kts Sea-level pressure: 30.35 ins. Hg: rising, then more slowly Visibility: 45 miles 3-hr Precip: 0.00 ins. BHO SA 1455 E30 BKN 100 OVC 45 279/51/40/0914G20/035/ 8/52/ 51007 1 P.M. Weather: Overcast stratocumulus, light rain Temperature: 51F; Dew Point: 42F; Relative Humidity: 70% Wind: E at 13G24 kts Sea-level pressure: 30.29 ins. Hg: falling, then more rapidly Visibility: 35 miles 6-hr Max temp: 51F 6-hr Min temp: 49F 6-hr Precip: Trace BHO SA 1755 E30 OVC 35R- 259/51/42/0813G24/029/ RB20 PCPN VRY LGT/ 8/5// 58020 6000 10052 20049 SUMMARY FOR SUNDAY, OCTOBER 11, 2020 TEMPERATURE (DEGREES F) MAX.....64   NORMAL.....62 MIN.....47   NORMAL.....45 MEAN....56   NORMAL.....53 DEPARTURE FROM 30-YEAR NORMAL................ +3 TOTAL DEPARTURE FOR THE MONTH................+25 [+2.1 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY............. 9  DEPARTURE..... -3 TOTAL HEATING UNITS FOR THE MONTH.............84  DEPARTURE.....-29 TOTAL HEATING UNITS FOR THE SEASON...........182  DEPARTURE.....-73 TOTAL HEATING UNITS LAST SEASON TO DATE......211  DEPARTURE.....-29 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY............. 0  DEPARTURE...... 0                   TOTAL COOLING UNITS FOR THE MONTH............. 1  DEPARTURE..... -3 TOTAL COOLING UNITS FOR THE SEASON...........831  DEPARTURE....+230 TOTAL COOLING UNITS LAST SEASON TO DATE......682  DEPARTURE....+149 PEAK WIND GUST FOR YESTERDAY (MPH)                    420C/Official...............32 NNW AT   6:09 A.M.                      AEROVANE....................35 NNW AT   6:09 A.M.                    ASOS........................32 NNW AT   6:09 A.M.                    DAVIS #1....................32 N   AT   6:09 A.M.                    DAVIS #2....................33 NNW AT   6:09 A.M.                    RMY N/A  MERLIN N/A FASTEST MILE FOR YESTERDAY.....................24 NNW AT   6:10 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................23 NW  AT   6:10 A.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE..............23 NNW AT   6:09 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE..............24 NNW AT   6:13 A.M. AVERAGE WIND SPEED AND DIRECTION.............11.7 E (287 total miles)                            ASOS......................11.2                    DAVIS #1..................12.1 NE [046 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE....-0.15                          ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........0.16  DEPARTURE....-1.48                          ASOS..............0.12 TOTAL PRECIPITATION FOR THE YEAR..........34.58  DEPARTURE....-6.14                          ASOS.............35.33 PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST AERO: Aerovane wind recording system gust RMY:  R.M. Young wind gust recording system TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized M:    Missing data 09/01  76/59/68/0/0.00/698/88              22 SSE  AERO 21 SE   RMY 20 09/02  69/59/64/-4/0.18/102/13             23 SSE  AERO 23 SSE  RMY 24 09/03  75/66/71/+4/0.04/000/00             22 SSW  AERO 21 SSW  RMY N/A 09/04  82/62/72/+5/0.00/763/98             26 WNW  AERO 26 WNW  RMY 25 09/05  76/55/66/-1/0.00/760/98             25 W    AERO 25 W    RMY 24 09/06  78/58/68/+1/0.00/356/46             24 W    AERO 24 W    RMY N/A 09/07  79/61/70/+4/0.00/632/82             27 SSE  AERO 30 SSE  RMY 28 09/08  82/61/72/+6/0.00/545/71             17 S    AERO 16 S    RMY 17 09/09  80/62/71/+5/0.00/214/28             16 S    AERO 15 S    RMY 16 09/10  81/69/75/+10/0.28/015/02            21 SSW  AERO 21 SSW  RMY N/A 09/11  72/55/64/-1/0.01/152/20             25 N    AERO 25 N    RMY N/A 09/12  68/51/60/-5/0.00/666/88             21 ENE  AERO 21 ENE  RMY 21 09/13  74/53/64/0/0.00/611/81              26 SSW  AERO 26 SSW  RMY 26 09/14  74/50/62/-2/0.00/511/68             29 NNW  AERO 33 NNW  RMY 30 09/15  64/44/54/-10/0.00/583/78            18 S    AERO 18 S    RMY N/A 09/16  72/49/61/-2/0.00/603/81             31 SSW  AERO 31 SSW  RMY 31 09/17  76/57/67/+4/0.00/453/61             26 WSW  AERO 28 W    RMY N/A 09/18  64/48/56/-6/0.00/163/22             28 NE   AERO 30 NNW  RMY N/A 09/19  59/42/51/-11/0.00/722/98            23 N    AERO 23 N    RMY N/A 09/20  58/40/49/-13/0.00/602/82            25 NE   AERO 25 NE   RMY 27 09/21  61/41/51/-10/0.00/694/95            29 NE   AERO 27 NE   RMY 29 09/22  63/39/51/-10/0.00/022/03            28 NNW  AERO 30 NNW  RMY 29 09/23  78/50/64/+4/0.00/617/85             31 NW   AERO 32 WNW  RMY 32 09/24  76/57/67/+7/0.00/347/48             20 SW   AERO 18 WSW  RMY 19 09/25  77/57/67/+7/0.00/655/91             18 ENE  AERO 18 WSW  RMY N/A 09/26  77/57/67/+8/0.00/516/72             21 S    AERO 21 S    RMY 21 09/27  79/64/72/+13/0.01/121/17            24 S    AERO 25 S    RMY 24 09/28  78/64/71/+13/0.07/199/28            24 SSE  AERO 24 S    RMY 25 09/29  76/62/69/+11/0.01/234/33            30 S    AERO 30 S    RMY N/A 09/30  72/56/64/+6/1.01/395/56             71 S    AERO 88 S    RMY N/A PRELIMINARY CLIMATE SUMMARY FOR OCTOBER CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST AERO: Aerovane wind recording system gust RMY:  R.M. Young wind gust recording system TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized M:    Missing data 10/01  75/56/66/+9/0.00/.../..             28 SW   AERO 28 SW   RMY N/A 10/02  63/49/56/-1/0.02/.../..             20 NW   AERO 21 NW   RMY 20 10/03  65/45/55/-1/0.00/.../..             19 WNW  AERO 19 WNW  RMY 19 10/04  65/45/55/-1/0.00/.../..             17 ESE  AERO 18 ESE  RMY 18 10/05  62/52/57/+1/0.00/.../..             17 ENE  AERO 17 ENE  RMY N/A 10/06  69/51/60/+5/0.00/.../..             28 S    AERO 28 S    RMY 29 10/07  73/50/62/+7/0.14/.../..             76 W    AERO 74 W    RMY 70  TSTM 10/08  61/42/52/-2/0.00/.../..             41 W    AERO 41 W    RMY N/A 10/09  60/37/49/-5/0.00/.../..             25 SSW  AERO 28 SSW  RMY N/A 10/10  75/52/64/+10/0.00/.../..            40 SSW  AERO 40 SSW  RMY 38 10/11  64/47/56/+3/0.00/.../..             32 NNW  AERO 35 NNW  RMY N/A 10/12  The low since midnight is 48F, the daily normal low is 44F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR OCTOBER 12 HIGH 87F IN 1954 LOW 31F IN 1906 PRECIP 1.53 INCHES IN 1948 SNOWFALL TRACE IN 1941 PEAK GUST 55 MPH NW IN 1963 RECORDS FOR OCTOBER 13 HIGH 84F IN 1930,1954 LOW 29F IN 2012 PRECIP 5.92 INCHES IN 1895 SNOWFALL 4.2 INCHES IN 1934 PEAK GUST 46e MPH W IN 1950 TODAY'S REPORT PREPARED BY: Matt Douglas