BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA TUESDAY, MARCH 16, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0554E SUNSET:  1752E VERY COLD START, BUT A GRADUAL MODERATION OF TEMPS WITH LIGHT WINDS.... The arctic air mass that moved through the region the last 36 hours or so is gradually releasing it's grip. While dew points continue to be very low (single digits), the temperature today has rebounded compared to yesterday reaching the mid 30s by early this afternoon under filtered sunshine. The wind has been very light today, which is a considerable change from the past 3 days. Average wind speed since 7 A.M. has only been around 3 mph! The other big story of this month is the continuing dry conditions. The monthly total stands at 0.14", which is 2.45" below normal. The yearly total is 8.14" which is 2.87" below normal to date. Perhaps we'll be able to put a little dent into the deficit late in the week. The high so far today is 35F, which is 9 degrees below the normal high of 44F. The low since midnight is 13F, which is 13 degrees below the daily normal low of 26F. Today's Observations: 7 A.M. Weather: Thin broken cirrus, few stratocumulus offshore distant ENE-S, few altocumulus distant SW-W Temperature: 16F; Dew Point: -1F; Relative Humidity: 47% Wind: NW @ 7 kts Sea-level pressure: 30.34 in Hg; rising, then falling Visibility: 70 miles 6-hr Max temp: 16F 6-hr Min temp: 13F 24-hr Precip: 0.00 ins. 24-hr Snow: 0.0 ins. Snow Depth: 0 ins. BHO SA 1155 E250 -BKN 70 273/16/-1/3207/034/ FEW SC OFFSHR DSNT ENE-SE FEW AC DSNT SW-W/ 8/531 50004 10016 20013 10 A.M. Weather: Scattered cirrus, thin broken cirrus, few altostratus distant SSW-W Temperature: 24F; Dew Point: -1F; Relative Humidity: 34% Wind: NNW @ 3 kts, wind light and variable Sea-level pressure: 30.31 in Hg; falling, then more rapidly Visibility: 65 miles 3-hr Precip: 0.00 ins. 3-hr Snow: 0.0 ins. BHO SA 1455 200 SCT E250 -BKN 65 264/24/-1/3303/031/ FEW AC DSNT SSW-W WND L/V/ 8/031 58009 1 P.M. Weather: Scattered altocumulus/altostratus, thin broken cirrus Temperature: 34F, Dew point: 2F; Relative Humidity: 25% Wind: SW @ 4 kts, wind light and variable Sea-level pressure: 30.25 in Hg; falling, then more rapidly Visibility: 70 miles 6-hr Max temp: 35F 6-hr Min temp: 16F 6-hr Precip: 0.00 ins. 6-hr Snow: 0.0 ins. Snow Depth: 0 ins. BHO SA 1755 140 SCT E250 -BKN 70 245/34/2/2204/025/ WND L/V/ 8/051 58019 10035 20016 SUMMARY FOR MONDAY, MARCH 15, 2021 TEMPERATURE (DEGREES F) MAX.......27     NORMAL.....44 MIN.......12     NORMAL.....26 MEAN......20     NORMAL.....35 DEPARTURE FROM 30-YEAR (1981-2010) NORMAL.......-15 TOTAL DEPARTURE FOR THE MONTH................... +3 [+0.0 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............45  DEPARTURE......+15 TOTAL HEATING UNITS FOR THE MONTH..............478  DEPARTURE...... -3 TOTAL HEATING UNITS FOR THE SEASON............4523  DEPARTURE.....-526 TOTAL HEATING UNITS LAST SEASON TO DATE.......4467  DEPARTURE......+56 PEAK WIND GUST (MPH):                      420C/Official..............48 NW  @  1:53 A.M.                      AEROVANE (south tower).....47 NW  @  1:53 A.M.                      ASOS.......................47 NW  @  1:56 A.M.                      DAVIS #1...................45 NW  @  1:54 A.M.                      DAVIS #2 (south tower).....N/A                      RMY........................54     @  1:54 A.M.                      VECTOR.....................55     @  1:56 A.M.                      MERLIN.....................N/A     FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL..................33 NW  @  1:57 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................30 NW  @  1:54 A.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............32 NW  @  1:54 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............N/A MAXIMUM 2-MINUTE RMY AVERAGE....................30 NNW @  1:52 A.M. MAXIMUM 2-MINUTE VECTOR AVERAGE.................31     @  1:52 A.M. AVERAGE WIND SPEED AND DIRECTION:                      CONTACTING/OFFICIAL......18.5 NW [444 total miles]                      ASOS.....................16.9                          DAVIS #1.................18.3 NNW                        DAVIS #2.................N/A                      RMY......................17.1 NNW                      VECTOR...................17.8 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.00  DEPARTURE....-0.18                              ASOS.............0.00 TOTAL PRECIPITATION FOR THE MONTH.............0.14  DEPARTURE....-2.45                              ASOS.............0.17 TOTAL PRECIPITATION FOR THE YEAR..............8.14  DEPARTURE....-2.87                               ASOS............8.43 SNOWFALL (INCHES) THROUGH THIS MORNING (EST): TOTAL SNOWFALL 24 HOURS ENDING 7 A.M.........  0.0  DEPARTURE.... -0.4 TOTAL SNOWFALL FOR THE MONTH.................. 0.2  DEPARTURE.... -7.0 TOTAL SNOWFALL FOR THE SEASON.................72.6  DEPARTURE....+18.9 PRELIMINARY CLIMATE SUMMARY FOR MARCH 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 03/01   42/24/33/+2/0.13/T/020/03        69 WNW  AERO 78 WNW  RMY 78 03/02   27/10/19/-12/T/0.1/679/100       63 WNW  AERO 71 WNW  RMY 69 03/03   45/19/32/0/0.00/0.0/375/55       30 W    AERO 30 W    RMY 34 03/04   38/22/30/-2/0.00/0.0/520/76      46 NW   AERO 51 NW   RMY 53 03/05   31/18/25/-7/0.00/0.0/549/80      39 WNW  AERO 44 NW   RMY 45 03/06   33/15/24/-8/0.00/0.0/675/98      28 WNW  AERO 29 WNW  RMY 30 03/07   35/15/25/-8/0.00/0.0/686/99      21 NW   AERO 22 NW   RMY 23 03/08   38/19/29/-4/T/T/389/56           20 NW   AERO 20 NW   RMY 21 03/09   56/30/43/+10/T/T/.../..          32 WNW  AERO 35 WNW  RMY 37 03/10   54/32/43/+10/0.00/0.0/.../..     29 SSW  AERO 29 SSW  RMY 31 03/11   71/35/53/+19/0.00/0.0/.../..     41 SSW  AERO 43 SSW  RMY 46 03/12   62/42/52/+18/0.00/0.0/.../..     52 WNW  AERO 59 WNW  RMY 57 03/13   46/27/37/+3/0.00/0.0/.../..      53 WNW  AERO 59 WNW  RMY 57 03/14   45/19/32/-3/0.01/0.1/.../..      51 WNW  AERO 58 NW   RMY 58 03/15   27/12/20/-15/0.00/0.0/.../..     48 NW   AERO 47 NW   RMY 54 03/16 The low since midnight is 13F, the daily normal low is 26F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR MARCH 16 HIGH 73 IN 1990 LOW 8 IN 1932 PRE 1.95 INS. IN 1900 SNOW 10.0 INS. IN 1896 WIND 79 MPH NE IN 1956 RECORDS FOR MARCH 17 HIGH 69 IN 2003 LOW 6 IN 1885 PRECIP 1.97 INS. IN 1968 SNOWFALL 6.5 INS. IN 1956 PEAK GUST 70 MPH SSW IN 1973 TODAY'S REPORT PREPARED BY: Matt Douglas