BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA FRIDAY, DECEMBER 24, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0712E SUNSET:  1616E CHILLY WITH SOME VERY LIGHT SNOWFALL THIS CHRISTMAS EVE.... We observed light snow for most of the day today, only amounting to a 1/10th inch by 1 P.M. Visibility reached 20 miles by noon, starting from 6 miles this morning. Wind was either very light or dead calm.   Ponkapoag and Houghton's Pond are almost completely covered with a thin layer of ice. Skating on them right now is definitely not advisable given how mild this month has been. The high so far today is 24F, which is 14 degrees below the normal max of 38F. The low since midnight is 20F, which is 3 degrees below the normal low of 23F. Merry Christmas, and best wishes to you and yours!   -------------------------------------------------------------- Today's Observations: 7 A.M. Weather: Overcast nimbostratus with light snow Temperature: 21F; Dew Point: 11F; Relative Humidity: 65% Wind: S @ 2 kts, light and variable Sea-level pressure: 1021.4 mb; 30.16 in. Hg: falling, then more rapidly Visibility: 6 miles, snow 6-hr Max temp: 21F 6-hr Min temp: 20F 24-hr Precip:  Trace 24-hr Snowfall: Trace Snow Depth: Trace BHO SA 1155 70 OVC 6S- 214/21/11/1802/016/ NEW SNW PST 24 HRS TRACE WND L/V/ 8/02/ 58008 6000/ 70000 10021 20020 10 A.M. Weather: Overcast nimbostratus with very light snow   Temperature: 21F; Dew Point: 18F; Relative Humidity: 87% Wind: WSW @ 2 kts, light and variable   Sea-level pressure: 1020.6 mb; 30.14 in Hg; rising steadily Visibility: 10 miles, snow 3-hr Precip:  0.01 ins. 3-hr Snowfall: 0.1 ins. BHO SA 1455 70 OVC 10S- 222/21/18/2402/019/ NEW SNW PST 3 HRS 0.1 INS. PCPN VRY LGT WND L/V/ 8/02/ 52008 6001/ 1 P.M. Weather: Overcast nimbostratus with very light snow beginning at 12:30 P.M. Temperature: 23F, Dew point: 16F; Relative Humidity: 73% Wind: Calm Sea-level pressure: 1020.9 mb; 30.15 in Hg; falling, then more slowly Visibility: 20 miles 6-hr Max temp: 24F 6-hr Min temp: 20F 6-hr Precip:   0.01 ins. 6-hr Snowfall: 0.1 ins. Snow Depth: Trace BHO SA 1755 70 OVC 20S- 209/23/16/0000/015/ S-B30 NEW SNW PST 6 HRS 0.1 INS. PCPN VRY LGT WND CALM/ 8/02/ 56013 6001/ 10024 20020 SUMMARY FOR THURSDAY, DECEMBER 23, 2021 TEMPERATURE (DEGREES F) MAX.......30     NORMAL.....30 MIN.......21     NORMAL.....21 MEAN......26     NORMAL.....26 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL............... -5 TOTAL DEPARTURE FOR THE MONTH...........................+94 [+3.9 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022) TOTAL HEATING UNITS FOR YESTERDAY...............39  DEPARTURE........+5 TOTAL HEATING UNITS FOR THE MONTH..............627  DEPARTURE.......-95 TOTAL HEATING UNITS FOR THE SEASON............1634  DEPARTURE......-292 TOTAL HEATING UNITS LAST SEASON TO DATE.......1695 DEPARTURE........-61 PEAK WIND GUST (MPH):                      Official (1-Sec AVG).......39 NW  @  8:49 A.M.                      AEROVANE...................38 NW  @  8:50 A.M.                      VECTOR #2 (Instantaneous)..43     @  8:49 A.M.                      DAVIS #2 ..................34 NW  @  9:08 A.M.                      RMY #2 (Instantaneous).....40 NW  @  8:49 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..................23 NW  @  9:08 A.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE..............25     @  9:43 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............24 NNW @  8:51 A.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE.................24 NW  @  9:43 A.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.....13.1 NW  [315 total miles]                      VECTOR #2...............13.7                      DAVIS #2................13.6 WNW                      RMY #2..................13.5 NW                      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.....-0.17 TOTAL PRECIPITATION FOR THE MONTH.............2.05  DEPARTURE.....-2.04 TOTAL PRECIPITATION FOR THE YEAR.............58.82  DEPARTURE.....+6.52 SNOWFALL (INCHES) THROUGH THIS MORNING (EST): TOTAL SNOWFALL 24 HRS ENDING 7 A.M...........TRACE  DEPARTURE......-0.5 TOTAL SNOWFALL FOR THE MONTH...................1.4  DEPARTURE......-7.1 TOTAL SNOWFALL FOR THE SEASON (2021-2022)......2.4  DEPARTURE......-8.6 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   44/30/37/0.00/0.0/263/47          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   30/21/26/-5/0.00/0.0/.../..       39 NW  AERO 38 NW  RMY 37 12/24 The low since midnight is 20F, 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 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 RECORDS FOR DECEMBER 25 HIGH 64 IN 2015 LOW -11 IN 1980 PRECIP 2.15 INS. IN 2020 SNOWFALL 8.5 INS. IN 2002 PEAK GUST 80 MPH NW IN 1971 TODAY'S REPORT PREPARED BY: Benjamin Turner