BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, OCTOBER 17, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME OCTOBER PROVIDES A RELIEF FROM THE OVERWHELMING RAINFALL DEFICIT.... During and after the frontal passage yesterday, a whole 2.21 inches of rain fell from yesterday to this morning. A light rain continued between 7 A.M. and 9 A.M, giving us an event total of 2.24 inches! This makes a dent in the annual rainfall deficit, making us less than 3 inches below normal. The monthly rainfall departure is now at a surplus of 1.74 inches. Following the rain and fog in the morning, visibility opened up to over 70 miles, and skies have become partly cloudy. Wind is on the strong side today due to the quick change in pressure of over 6 millibars since this morning. Wind is north-westerly at an average of 20 mph, and the highest gust is 37 mph as of yet. The high so far today is 55F, 5 degrees below the daily normal of 60F. The low since midnight is 39F, 3 degrees below the normal low of 42F. 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: Overcast nimbostratus, light rain Temperature: 40F; Dew Point: 40F; Relative Humidity: 100% Wind: NW at 13G21 kts Sea-level pressure: 30.08 ins. Hg: rising then falling Visibility: 4 miles ( fog) 6-hr Max temp: 46F 6-hr Min temp: 40F 24-hr Precip: 2.21 ins. BHO SA 1155 E80 OVC 4R-F 185/40/40/3313G21/008/ R-CTD/ 8/02/ 70221 50002 10046 20040 10 A.M. Weather: Broken cumulus and altocumulus Temperature: 44F; Dew Point: 41F; Relative Humidity: 88% Wind: WNW at 11G24 kts Sea-level pressure: 30.17 ins. Hg: rising rapidly Visibility: 70 miles 3-hr Precip: 0.03 ins. BHO SA 1455 30 BKN 70 BKN 70 214/44/41/3011G24/017/ 8/170 6003/ 53029 1 P.M. Weather: Scattered cumulus Temperature: 54F; Dew Point: 38F; Relative Humidity: 53% Wind: WNW at 12G22 kts, peak of 35 mph at 12:16 P.M. Sea-level pressure: 30.22 ins. Hg: rising steadily Visibility: 75 miles 6-hr Max temp: 55F 6-hr Min temp: 39F 6-hr Precip: 0.03 inches BHO SA 1755 30 SCT 75 230/54/38/3012G22/022/ PK WND 3030/16/ 8/100 6003/ 51016 10055 20039   SUMMARY FOR FRIDAY, OCTOBER 16, 2020 TEMPERATURE (DEGREES F) MAX.....68   NORMAL.....60 MIN.....48   NORMAL.....43 MEAN....58   NORMAL.....51 DEPARTURE FROM 30-YEAR NORMAL.................+7 TOTAL DEPARTURE FOR THE MONTH................+43 [+2.5 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............7  DEPARTURE..... -7 TOTAL HEATING UNITS FOR THE MONTH............130  DEPARTURE.....-48 TOTAL HEATING UNITS FOR THE SEASON...........228  DEPARTURE.....-92 TOTAL HEATING UNITS LAST SEASON TO DATE......264  DEPARTURE.....-36 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY............. 0  DEPARTURE...... 0                   TOTAL COOLING UNITS FOR THE MONTH............. 1  DEPARTURE..... -4 TOTAL COOLING UNITS FOR THE SEASON...........831  DEPARTURE....+229 TOTAL COOLING UNITS LAST SEASON TO DATE......682  DEPARTURE....+149 PEAK WIND GUST FOR YESTERDAY (MPH)                    420C/Official...............28 S   AT   1:02 A.M.                      AEROVANE (south tower)......30 S   AT  12:17 A.M.                    ASOS........................31 S   AT  12:58 A.M.                    DAVIS #1....................31 S   AT  12:58 A.M.                    DAVIS #2 (south tower)......33 N   AT   2:34 A.M.                    RMY.........................34                    MERLIN......................33 FASTEST MILE FOR YESTERDAY.....................24 NNW AT  12:34 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................24 S   AT   1:05 A.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE..............23 NNW AT  12:33 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE..............26 S   AT   1:05 A.M. AVERAGE WIND SPEED AND DIRECTION.............12.8 S [307 total miles]                            ASOS......................12.8                    DAVIS #1..................12.3 WSW [248 deg.]                    DAVIS #2..................13.8 SSW [204 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....2.21  DEPARTURE....+2.06                          ASOS..............2.19 TOTAL PRECIPITATION FOR THE MONTH..........4.11  DEPARTURE....+1.74                          ASOS..............4.10 TOTAL PRECIPITATION FOR THE YEAR..........38.53  DEPARTURE....-2.92                          ASOS.............39.31 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  52/48/50/-3/T/.../..                28 E    AERO 27 E    RMY N/A 10/13  57/49/53/0/1.74/.../..              32 E    AERO 33 E    RMY N/A 10/14  67/47/57/+5/0.00/.../..             23 WNW  AERO 25 WNW  RMY N/A 10/15  71/50/61/+9/0.00/.../..             43 S    AERO 46 S    RMY 42 10/16  68/48/58/+7/..../.../..             28 S    AERO 30 S    RMY N/A 10/17 The low since midnight is 40F, the daily normal low is 42F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR OCTOBER 17 HIGH 86F IN 1947 LOW 25F IN 1886 PRECIP 1.87 INCHES IN 1989 SNOWFALL TRACE IN 1970 PEAK GUST 61 MPH E IN 2019 RECORDS FOR OCTOBER 18 HIGH 82F IN 1908 LOW 26F IN 1939 PRECIP 2.79 INCHES IN 1975 SNOWFALL 3.0 INCHES IN 2009 PEAK GUST 66 MPH S IN 1967 TODAY'S REPORT PREPARED BY: Benjamin Turner