BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA THURSDAY, DECEMBER 23, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0711E SUNSET:  1616E CLEAR WITH EXCELLENT VISIBILITY AND LOWER THAN NORMAL TEMPERATURES.... Today we observed an excellent 85 miles for the average visibility, a great contrast to the conditions observed yesterday. Today dried out considerably, as the dew point reached 0F by the 1 P.M. observation. Skies were mostly clear this morning, but we did encounter a layer of cirrus clouds that took up most of the sky in the early afternoon. Rainfall from yesterday totaled 0.10 inches, but we are still left at a rain and snowfall deficit reaching the end of the month. Rain total this month is 2.05 inches, 1.87 inches below normal on the month. Monthly snow is at only at 1.4 inches, -6.6 inches below normal. The high so far today is 29F, which is 11 degrees above the normal max of 38F. The low since midnight is 23F, which is the same as the normal low. -------------------------------------------------------------- Today's Observations: 7 A.M. Weather: Clear, few cumulus offshore Temperature: 24F; Dew Point: 12F; Relative Humidity: 60% Wind: NW @ 11G21 kts Sea-level pressure: 1015.8 mb; 29.99 in. Hg: rising, then more slowly Visibility: 70 miles 6-hr Max temp: 29F 6-hr Min temp: 23F 24-hr Precip:  0.10 ins. 24-hr Snowfall: 0.0 ins. Snow Depth: 0 ins. BHO SA 1155 CLR 70 158/24/12/3111G21/999/ FEW CU OFFSHR/ 8/100 51036 70010 10029 20023 10 A.M. Weather: Clear, few cumulus offshore and few cirrostratus SW-W-N   Temperature: 26F; Dew Point: 8F; Relative Humidity: 46% Wind: NW @ 15G32 kts, peak of 37 mph NW at 9:48 A.M.   Sea-level pressure: 1019.5 mb; 30.11 in Hg; rising, then more slowly Visibility: 85 miles 3-hr Precip:  0.00 ins. 3-hr Snowfall: 0.0 ins. BHO SA 1455 CLR 85 195/26/8/3115G32/011/ FEW CU OFFSHR FEW CS SW-W-N PK WND 3132/48/ 8/105 51037 1 P.M. Weather: Broken cirrostratus, few cumulus offshoree Temperature: 27F, Dew point: 0F; Relative Humidity: 31% Wind: NW @ 10G19 kts Sea-level pressure: 1019.2 mb; 30.10 in Hg; steady then falling Visibility: 85 miles 6-hr Max temp: 29F 6-hr Min temp: 23F 6-hr Precip:   0.00 ins. 6-hr Snowfall: 0.0 ins. Snow Depth: 0.0 ins. BHO SA 1755 250 BKN 85 192/27/0/3110G19/010/ FEW CU OFFSHR/ 8/106 58003 10029 20023 SUMMARY FOR WEDNESDAY, DECEMBER 22, 2021 TEMPERATURE (DEGREES F) MAX.......45     NORMAL.....39 MIN.......30     NORMAL.....23 MEAN......38     NORMAL.....31 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL............... +7 TOTAL DEPARTURE FOR THE MONTH...........................+99 [+4.3 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022) TOTAL HEATING UNITS FOR YESTERDAY...............27  DEPARTURE........-7 TOTAL HEATING UNITS FOR THE MONTH..............588  DEPARTURE......-100 TOTAL HEATING UNITS FOR THE SEASON............1595  DEPARTURE......-296 TOTAL HEATING UNITS LAST SEASON TO DATE.......1662 DEPARTURE........-67 PEAK WIND GUST (MPH):                      Official (1-Sec AVG).......47 NW  @  4:18 A.M.                      AEROVANE...................45 NW  @  4:48 A.M.                      VECTOR #2 (Instantaneous)..50     @  :37 A.M.                      DAVIS #2 ..................44 WNW @  3:16 A.M.                      RMY #2 (Instantaneous).....47 NW  @  2:37 A.M.                      ASOS...........OUT OF SERVICE D/T RENOVATIONS                      VECTOR #1......OUT OF SERVICE D/T RENOVATIONS                      DAVIS #1.......OUT OF SERVICE D/T RENOVATIONS                      RMY #1.........OUT OF SERVICE D/T RENOVATIONS                        MERLIN.........OUT OF SERVICE D/T RENOVATIONS FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL..................31 NW  @  4:10 P.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE..............30     @  4:10 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............30 NW  @  4:11 P.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE.................30 NW  @  4:10 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.......OUT OF SERVICE D/T RENOVATIONS MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...OUT OF SERVICE D/T RENOVATIONS MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS MAXIMUM 2-MINUTE RMY #1 AVERAGE.....OUT OF SERVICE D/T RENOVATIONS AVERAGE WIND SPEED AND DIRECTION:                      CONTACTING/OFFICIAL.....14.5 NW  [348 total miles]                      VECTOR #2...............15.1                      DAVIS #2................14.9 NW                      RMY #2..................14.9 NNW                      RMY #1..............OUT OF SERVICE D/T RENOVATIONS                      ASOS................OUT OF SERVICE D/T RENOVATIONS                      VECTOR #1...........OUT OF SERVICE D/T RENOVATIONS                      DAVIS #1............OUT OF SERVICE D/T RENOVATIONS    PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.10  DEPARTURE.....-0.08 TOTAL PRECIPITATION FOR THE MONTH.............2.05  DEPARTURE.....-1.87 TOTAL PRECIPITATION FOR THE YEAR.............58.82  DEPARTURE.....+6.69 SNOWFALL (INCHES) THROUGH THIS MORNING (EST): TOTAL SNOWFALL 24 HRS ENDING 7 A.M.............0.0  DEPARTURE......-0.4 TOTAL SNOWFALL FOR THE MONTH...................1.4  DEPARTURE......-6.6 TOTAL SNOWFALL FOR THE SEASON (2021-2022)......2.4  DEPARTURE......-8.1 PRELIMINARY CLIMATE SUMMARY FOR DECEMBER CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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 12/01   44/30/37/0.00/0.0/263/47          35 W   AERO 35 W   RMY 34       12/02   58/35/47/10/T/0.0/106/19          56 WNW AERO 59 WNW RMY 62 TSTM 12/03   41/28/35/-1/0.00/0.0/512/92       46 NW  AERO 44 NW  RMY 46 12/04   39/25/32/-4/0.00/0.0/233/42       25 SW  AERO 23 SW  RMY 26 12/05   45/32/39/+3/0.00/0.0/460/83       25 SE  AERO 25 SE  RMY 25 12/06   59/37/48/+13/0.34/0.0/077/14      59 WNW AERO 59 NW  RMY 60 12/07   40/29/35/0/T/0.0/436/79           47 WNW AERO 36 WNW RMY 48 12/08   34/25/30/-5/0.05/0.6/000/00       26 NNE AERO 25 NE  RMY 26 12/09   35/20/28/-6/0.05/0.6/319/58       32 NW  AERO 30 NW  RMY 33 12/10   43/27/35/+1/0.00/0.0/000/00       21 SE  AERO 20 SE  RMY 21 12/11   62/37/50/+16/0.34/0.0/000/00      57 SSW AERO 59 SSW RMY 58 12/12   58/36/47/+13/0.05/0.0/416/76      55 WNW AERO 55 WNW RMY 58 12/13   50/35/43/+10/0.00/0.0/224/41      32 WSW AERO 33 WSW RMY 33 12/14   50/33/42/+9/0.00/0.0/442/81       31 WSW AERO 30 WSW RMY 32 12/15   42/28/35/+2/T/0.0/153/28          35 SSE AERO 35 SSE RMY 36 12/16   58/42/50/+18/0.21/0.0/016/03      35 SW  AERO 37 SW  RMY 38 12/17   56/39/48/+16/0.00/0.0/518/95      43 WNW AERO 41 WNW RMY 46 12/18   39/31/35/+3/0.52/0.2/000/00       21 NNW AERO 20 NNW RMY 20 12/19   39/20/30/-2/0.39/0.0/.../..       35 NNW AERO 37 NNW RMY 36 12/20   32/15/24/-7/0.00/0.0/.../..       29 SSW AERO 30 SSW RMY 30 12/21   40/27/34/+3/0.00/0.0/.../..       31 SW  AERO 32 SW  RMY 33 12/22   45/30/38/+7/0.10/0.0/.../..       47 NW  AERO 45 NW  RMY 47 12/23 The low since midnight is 23F, the daily normal low is 23F DAILY RECORDS FOR DECEMBER 2021 12/16/21: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 42F           TIES PREVIOUS RECORD OF 42F SET IN 1982 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR DECEMBER 23 HIGH 62 IN 1990 LOW -1 IN 1989 PRECIP 1.53 INS. IN 1994 SNOWFALL 11.9 INS. IN 1947 PEAK GUST 67 SSE IN 2004 RECORDS FOR DECEMBER 24 HIGH 67 IN 2015 LOW -6 IN 1943 PRECIP 2.21 INS. IN 1994 SNOWFALL 12.3 INS. IN 1961 PEAK GUST 79e MPH SE IN 1941 TODAY'S REPORT PREPARED BY: Benjamin Turner