BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA FRIDAY, DECEMBER 17, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0707E SUNSET:  1613E MILD WEATHER PERSISTS AFTER YESTERDAY'S RECORD WARMTH... Before a cold front swung through this morning, we saw a record tying high minimum set yesterday. 42F was the lowest the mercury traveled which matches the reading also observed in 1982! On the  other end, the daily high came up 3 degrees short of the 61F max cemented in 1971. As you'd expect, the average temp departure Thursday was a beefy +18F!  A cold front punched through amidst the 7AM observation today delivering briefly gusty winds in the 40 MPH range, yet very few clouds and no precipitation...rather rare to see a front this dry! Despite welcoming a new air mass, we have not had to send our farewell to the mild temps. We are enjoying plentiful sunshine coinciding with readings in the mid-50s. The high so far today is 56F (set between 5a-6a), which is 16 degrees above the normal max of 40F. The low since midnight is 50F, which 25 degrees above the normal low of 25F. -------------------------------------------------------------- Today's Observations: 7 A.M. Weather: Clear (few cirrus distant SE-SW) Temperature: 52F; Dew Point: 31F; Relative Humidity: 44% Wind: NW @ 20G34 kts Peak Wind: 39 MPH (34 kts) NW @ 6:52 AM Sea-level pressure: 1010.8 mb; 29.85 in. Hg: rising, then rising more rapidly Visibility: 80 miles 6-hr Max temp: 56F 6-hr Min temp: 51F 24-hr Precip:  Trace  24-hr Snowfall: 0.0 ins.  Snow Depth: 0 ins. BHO SA 1155 CLR 80 108/52/31/3120G34/985/ FEW CI DSNT SE-SW PK WND 3134/52/ 8/002 53039 70000 10056 20051 10 A.M. Weather: Clear (few cirrus distant SE-SW) Temperature: 52F; Dew Point: 21F; Relative Humidity: 29% Wind: WNW @ 16G24 kts  Sea-level pressure: 1014.5 mb; 29.96 in Hg; rising, then rising more slowly Visibility: 85 miles 3-hr Precip: 0.00 3-hr Snowfall: 0.0 ins. BHO SA 1455 CLR 85 145/52/21/3016G24/996/ FEW CI DSNT SE-SW/ 8/002 51037 1 P.M. Weather: Clear (few cirrus distant SE-SW) Temperature: 55F, Dew point: 20F; Relative Humidity: 25% Wind: WNW @ 9G24 kts  Sea-level pressure: 1013.7 mb; 29.93 in Hg; falling, then falling more slowly Visibility: 85 miles 6-hr Max temp: 56F 6-hr Min temp: 50F 6-hr Precip: 0.00 ins. 6-hr Snowfall: 0.0 ins. Snow Depth: 0.0 ins. BHO SA 1775 CLR 85 137/55/20/3009G24/993/ FEW CI DSNT SE-SW/ 8/002 56008 10056 20050 SUMMARY FOR THURSDAY, DECEMBER 16, 2021 TEMPERATURE (DEGREES F) MAX.......58     NORMAL.....40 MIN.......42     NORMAL.....25 MEAN......50     NORMAL.....32 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL...............+18 TOTAL DEPARTURE FOR THE MONTH...........................+79 [+4.7 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022) TOTAL HEATING UNITS FOR YESTERDAY...............15  DEPARTURE.......-18 TOTAL HEATING UNITS FOR THE MONTH..............407  DEPARTURE.......-80 TOTAL HEATING UNITS FOR THE SEASON............1414  DEPARTURE......-276 TOTAL HEATING UNITS LAST SEASON TO DATE.......1439  DEPARTURE.......-25 PEAK WIND GUST (MPH):                      Official (1-Sec AVG).......35 SW  @  5:37 P.M.                      AEROVANE...................37 SW  @  5:37 P.M.                      VECTOR #2 (Instantaneous)..38     @  5:36 P.M.                      DAVIS #2 ..................42 S   @ 12:39 A.M.                      RMY #2 (Instantaneous).....38 SW  @  2:55 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..................29 SW  @  5:35 P.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE..............28     @  5:36 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............29 S   @ 12:13 A.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE.................29 SW  @  5:37 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......18.5 SSW  [445 total miles]                      VECTOR #2................19.0                      DAVIS #2.................18.7 SW                      RMY #2...................19.2 SW                      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......TRACE  DEPARTURE.....-0.18 TOTAL PRECIPITATION FOR THE MONTH.............1.04  DEPARTURE.....-1.82 TOTAL PRECIPITATION FOR THE YEAR.............57.81  DEPARTURE.....+6.74 SNOWFALL (INCHES) THROUGH THIS MORNING (EST): TOTAL SNOWFALL 24 HRS ENDING 7 A.M.............0.0  DEPARTURE......-0.4 TOTAL SNOWFALL FOR THE MONTH...................1.2  DEPARTURE......-4.1 TOTAL SNOWFALL FOR THE SEASON (2021-2022)......2.2  DEPARTURE......-5.6 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/.../..          35 W   AERO 35 W   RMY 34       12/02   58/35/47/10/T/0.0/.../..          56 WNW AERO 59 WNW RMY 62 TSTM 12/03   41/28/35/-1/0.00/0.0/.../..       46 NW  AERO 44 NW  RMY 46 12/04   39/25/32/-4/0.00/0.0/.../..       25 SW  AERO 23 SW  RMY 26 12/05   45/32/39/+3/0.00/0.0/.../..       25 SE  AERO 25 SE  RMY 25 12/06   59/37/48/+13/0.34/0.0/.../..      59 WNW AERO 59 NW  RMY 60 12/07   40/29/35/0/T/0.0/.../...          47 WNW AERO 36 WNW RMY 48 12/08   34/25/30/-5/0.05/0.6/.../..       26 NNE AERO 25 NE  RMY 26 12/09   35/20/28/-6/0.05/0.6/.../..       32 NW  AERO 30 NW  RMY 33 12/10   43/27/35/+1/0.00/0.0/.../..       21 SE  AERO 20 SE  RMY 21 12/11   62/37/50/+16/0.34/0.0/.../..      57 SSW AERO 59 SSW RMY 58 12/12   58/36/47/+13/0.05/0.0/.../..      55 WNW AERO 55 WNW RMY 58 12/13   50/35/43/+10/0.00/0.0/.../..      32 WSW AERO 33 WSW RMY 33 12/14   50/33/42/+9/0.00/0.0/.../..       31 WSW AERO 30 WSW RMY 32 12/15   42/28/35/+2/T/0.0/.../..          35 SSE AERO 35 SSE RMY 36 12/16   58/42/50/+18/.../0.0/.../..       35 SW  AERO 37 SW  RMY 38 12/17 The low since midnight is 50F, the daily normal low is 24F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR DECEMBER 17 HIGH 63 IN 2000 LOW -9 IN 1942 PRECIP 3.03 INS. IN 1888 SNOWFALL 15.1 INS. IN 2020 PEAK GUST 78 MPH SSE IN 2000 RECORDS FOR DECEMBER 18 HIGH 59 IN 1928 LOW -11 IN 1919 PRECIP 1.44 INS. IN 1915 SNOWFALL 7.0 INS. IN 1904 PEAK GUST 76e W IN 1978 TODAY'S REPORT PREPARED BY: Andrew Swanson