BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

FRIDAY, FEBRUARY 12, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0644E
SUNSET:  1713E

MORNING SUNSHINE FADES AWAY ATOP GREAT BLUE HILL...

A busy northwest wind yesterday afternoon began ushering
in a reinforcing shot of arctic air. We bottomed out at 8 
degrees this morning and have only reached the mid-20s so
far today. Winds have slowly backed off as the afternoon 
progresses. Wind chill values are hanging out in the
upper single digits and low teens.

Sunshine was in good abundance during the morning, though
mid and high level clouds have filtered in here early this
afternoon. As of 2PM, mostly cloudy skies are now in charge. 

Visibility is excellent with solid views of Mount Monadnock in
southwestern New Hampshire. 

The high so far today is 25F, 11 degrees below the daily 
average max of 36F. The low since midnight is 8F, 10 degrees
below the normal minimum of 18F.
 

PRELIMINARY STATS FOR JANUARY 2021

TEMPERATURE, Deg. F
Avg. Max. 35.4 [+1.6]
Avg. Min. 22.5 [+5.4]
Mean      28.9 [+3.4]
24-hour corrected mean: 28.8
Max. for month: 52F on the 16th
Min. for month: 2F on the 31st

HEATING DEGREE DAYS
Total heating units:   1114 [-112]
Total for the season:  3044 [-487]
Total for last season: 3229

PRECIPITATION, Inches
Total: 2.32 [-2.03]
Greatest in 24 hrs: 1.36 on the 16th 

SNOWFALL, Inches
Total: 7.2 [-9.9]
Greatest in 24 hrs: 4.2 on the 26th-27th

WIND, mph
Avg. uncorrected wind speed: 11.1 mph
Avg. corrected wind speed:   11.7 mph
Prevailing wind direction:   NW [25%]
Peak gust and direction:     48 ESE on the 16th

SUNSHINE:
Campbell-Stokes card minutes: 8054 minutes of a possible 17130 or 47%
Astronomical total minutes: 8320 minutes of a possible 17685 or 47%


Today's Observations:

7 A.M.
Weather: Clear (few cirrus distant SE to SW)
Temperature: 8F; Dew Point: -4F; Relative Humidity: 57%
Wind: NW @ 14G24 kts
Sea-level pressure: 30.29 in Hg; rising unsteadily
Visibility: 80 miles
6-hr Max temp: 14F
6-hr Min temp: 8F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 15 ins.
BHO SA 1155 CLR 80 257/8/-4/3114G24/029/ FEW CI DSNT SE-SW/
8/001 4/015 52013 10014 20008

10 A.M.
Weather: Scattered Cirrus (few altocumulus distant SW)
Temperature: 15F; Dew Point: -5F; Relative Humidity: 41%
Wind: NW @ 14G21 kts
Sea-level pressure: 30.31 in Hg; rising unsteadily
Visibility: 85 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 250 SCT 85 264/15/-5/3214G21/031/ FEW AC DSNT SW/ 8/031 52007

1 P.M.
Weather: Broken Altostratus/Altocumulus, Broken Cirrus
Temperature: 24F, Dew point: -1F; Relative Humidity: 33%
Wind: NW @ 7 kts
Sea-level pressure: 29.79 in Hg, falling, then falling more rapidly
Visibility: 70 miles 
6-hr Max temp: 25F
6-hr Min temp: 8F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 15 ins.
BHO SA 1755 120 BKN 250 BKN 70 248/24/-1/3107/979/ 8/031
4/015 58016 10025 20008

SUMMARY FOR THURSDAY, FEBRUARY 11, 2021

TEMPERATURE (DEGREES F)
MAX.......31   NORMAL.....36
MIN.......15   NORMAL.....18
MEAN......23   NORMAL.....27

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL......... -4
TOTAL DEPARTURE FOR THE MONTH.....................+16 [+1.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............42  DEPARTURE...... +4
TOTAL HEATING UNITS FOR THE MONTH..............408  DEPARTURE..... -17
TOTAL HEATING UNITS FOR THE SEASON............3452  DEPARTURE.....-504
TOTAL HEATING UNITS LAST SEASON TO DATE.......3564  DEPARTURE.....-112

PEAK WIND GUST (MPH):
                     420C/Official..............28 NW  @ 10:37 P.M.
                     AEROVANE (south tower).....26 NW  @  5:03 P.M. 
                     ASOS.......................28 NW  @ 10:37 P.M.
                     DAVIS #1...................28 NW  @ 10:36 P.M.
                     DAVIS #2 (south tower).....26 S   @  4:49 P.M.
                     RMY........................31     @ 10:35 P.M
                     VECTOR.....................31     @ 10:36 P.M.
                     MERLIN.....................n/a

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL..................19 NW @  5:06 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................18 NW @ 10:38 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............20 NW @  5:06 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............21 NW @  5:05 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE....................18 NW @  3:51 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE.................19    @  5:03 P.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL.....8.3 WNW [198 total miles]
                     ASOS....................8.5     
                     DAVIS #1................8.9 NW  
                     DAVIS #2................8.8 NW  
                     RMY.....................8.3 NW
                     VECTOR..................8.8


PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.00  DEPARTURE....-0.14
                             ASOS.............0.00
TOTAL PRECIPITATION FOR THE MONTH.............3.69  DEPARTURE....+2.20
                             ASOS.............3.92
TOTAL PRECIPITATION FOR THE YEAR..............6.01  DEPARTURE....+0.17
                              ASOS............6.27

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M...........0.0  DEPARTURE.... -0.5
TOTAL SNOWFALL FOR THE MONTH..................29.0  DEPARTURE....+23.6
TOTAL SNOWFALL FOR THE SEASON.................62.4  DEPARTURE....+23.9


PRELIMINARY CLIMATE SUMMARY FOR JANUARY 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

01/01   36/25/31/+4/0.06/0.3/330/60       23 E    AERO 23 NNW  RMY 23
01/02   43/30/37/+10/0.30/T/116/21        37 WNW  AERO 39 WNW  RMY 44
01/03   33/27/30/+4/0.07/0.8/000/00       23 NNE  AERO 22 NNE  RMY 25
01/04   37/28/33/+7/0.01/0.1/110/20       25 NNE  AERO 23 NNE  RMY 27
01/05   31/28/30/+4/0.05/0.7/000/00       21 NNW  AERO 21 NNW  RMY 22
01/06   38/28/33/+7/T/T/244/44            30 NW   AERO 29 NW   RMY 32
01/07   42/26/34/+8/0.00/0.0/516/93       28 NNW  AERO 26 NNW  RMY 31
01/08   40/21/31/+5/0.00/0.0/517/93       25 NNW  AERO 22 NNW  RMY 25
01/09   34/30/27/+1/0.00/0.0/395/71       25 N    AERO 23 N    RMY 24
01/10   39/24/32/+7/0.00/0.0/493/88       25 NNW  AERO 23 NNW  RMY 24
01/11   34/25/30/+5/0.00/0.0/000/00       17 SW   AERO 16 SSW  RMY 16
01/12   40/24/32/+7/0.00/0.0/438/78       23 WNW  AERO 23 WNW  RMY 24
01/13   40/26/33/+8/0.00/0.0/389/69       15 SW   AERO 14 SW   RMY 19
01/14   38/31/35/+10/0.09/T/000/00        16 SSW  AERO 16 SSW  RMY 19
01/15   40/32/36/+11/0.00/0.0/266/47      25 ESE  AERO 23 ESE  RMY 27 TSTM
01/16   52/33/43/+18/1.36/0.0/000/00      48 ESE  AERO 53 SE   RMY 54
01/17   41/32/37/+12/0.00/0.0/314/55      47 W    AERO 46 W    RMY 54
01/18   42/27/35/+10/T/0.0/366/64         35 W    AERO 37 WNW  RMY 36
01/19   39/23/31/+6/T/T/293/51            25 WNW  AERO 25 WNW  RMY 27
01/20   37/22/30/+5/T/T/144/25            32 WNW  AERO 33 WNW  RMY 34
01/21   31/17/24/-1/T/0.1/081/14          23 WNW  AERO 24 SSW  RMY 24
01/22   42/29/36/+11/0.00/0.0/226/39      28 WNW  AERO 24 WNW  RMY 29
01/23   29/14/22/-3/0.00/0.0/442/76       41 WNW  AERO 41 WNW  RMY 46
01/24   29/13/21/-4/0.00/0.0/571/98       43 WNW  AERO 48 WNW  RMY 44
01/25   35/15/25/0/0.00/0.0/574/98        28 NW   AERO 29 NW   RMY 30
01/26   36/20/28/+3/0.17/2.4/223/38       18 E    AERO 18 E    RMY 20
01/27   33/27/30/+5/0.12/1.9/000/00       16 NNW  AERO 17 NNW  RMY 17
01/28   29/13/21/-4/0.09/0.9/000/00       39 NW   AERO 48 NW   RMY 42
01/29   15/4/10/-15/0.00/0.0/250/42       44 NW   AERO 46 NW   RMY 50
01/30   19/3/11/-15/0.00/0.0/591/99       24 NW   AERO 28 NW   RMY 27
01/31   23/2/13/-13/0.00/0.0/431/72       18 NW   AERO 18 NW   RMY 19

PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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

02/01   32/21/27/+1/1.86/12.7/.../..      53 NE   AERO 65 NE   RMY 62
02/02   34/29/32/+6/0.91/1.6/.../..       52 NNE  AERO 55 NE   RMY 58
02/03   34/26/30/+4/0.01/0.2/.../..       20 NW   AERO 20 NW   RMY 22
02/04   37/26/32/+6/0.02/0.7/.../..       23 NW   AERO 22 NW   RMY M       
02/05   39/26/33/+7/0.01/T/.../..         33 S    AERO 32 S    RMY 30
02/06   40/28/34/+8/0.00/0.0/.../..       42 WSW  AERO 41 WSW  RMY 47
02/07   35/25/30/+3/0.71/11.6/.../..      27 WNW  AERO 28 WNW  RMY 30
02/08   27/13/20/-7/0.00/0.0/.../..       29 NW   AERO 31 WNW  RMY 32
02/09   27/18/23/-4/0.17/2.2/.../..       16 N    AERO 16 N    RMY 17
02/10   31/15/23/-4/0.00/0.0/.../..       26 WNW  AERO 25 WNW  RMY 28
02/11   31/15/23/-4/0.00/0.0/.../..       28 NW   AERO 26 NW   RMY 31

The low since midnight is 8F, the daily normal low is 18F

DAILY RECORDS

02/01 -RECORD SNOWFALL OF 12.7 INS, BREAKING PREVIOUS RECORD
       OF 11.0 INS SET IN 1898
02/01 -RECORD PRECIPITATION OF 1.86 INS, BREAKING PREVIOUS 
       RECORD OF 1.30 INS SET IN 1898 

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR FEBRUARY 12
HIGH 56F IN 1999
LOW -14F IN 1914
PRECIP 4.85 INCHES IN 1886 [RECORD FOR MONTH]
SNOWFALL 15.0 INCHES IN 2006
PEAK GUST 70 MPH E IN 1985

RECORDS FOR FEBRUARY 13
HIGH 64F IN 1951
LOW -10F IN 1967
PRECIP 2.80 INCHES IN 2008
SNOWFALL 13.5 INCHES IN 1894
PEAK GUST 60 MPH SE IN 1972

TODAY'S REPORT PREPARED BY: Andrew Swanson