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

MONDAY, FEBRUARY 15, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0640E
SUNSET:  1717E

OVERCAST AND COLD WITH SPOTTY LIGHT FREEZING RAIN....

Not much to report so far today. It's been cloudy and cold 
with spotty very light freezing rain falling from time to time.
It's been so light however, that it hasn't amounted to anything,
either in the rain gauge or any ice accrual on surfaces.

The wind has been generally light with occasional periods of 
gusts of around 20 mph. The average speed since 7 A.M. is only
around 8 mph.  

The high so far today is 31F, 6 degrees below the daily 
average max of 37F. The low since midnight is 29F, 10 degrees
above the normal minimum of 19F.
 

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: 8052 minutes of a possible 17130 or 47%
Astronomical total minutes: 8314 minutes of a possible 17685 or 47%


Today's Observations:

7 A.M.
Weather: Broken stratus, overcast nimbostratus, very light
freezing rain
Temperature: 29F; Dew Point: 24F; Relative Humidity: 81%
Wind: NNE @ 8 kts
Sea-level pressure: 30.26 in Hg; rising, then more slowly
Visibility: 40 miles
6-hr Max temp: 30F
6-hr Min temp: 29F
24-hr Precip: Trace
24-hr Snow: 0.0 ins.
Snow Depth: 13 ins.
BHO SA 1155 E20 BKN 40 OVC 40ZR- 246/29/24/0308/026/ PCPN VRY LGT ZR-B50 THN K LYR ALQDS/ 8/6// 4/013 51008 6000/ 70000 10030 20029

10 A.M.
Weather: Overcast stratus
Temperature: 30F; Dew Point: 26F; Relative Humidity: 78%
Wind: NNE @ 8 kts
Sea-level pressure: 30.25 in Hg; rising, then falling
Visibility: 30 miles
3-hr Precip: Trace
3-hr Snow: 0.0 ins.
BHO SA 1455 E16 OVC 30 244/30/26/0208/025/ ZR-E40/ 8/6// 55002 6000/

1 P.M.
Weather: Overcast stratus, very light freezing rain
Temperature: 30F, Dew point: 29F; Relative Humidity: 96%
Wind: N @ 10G15 kts
Sea-level pressure: 30.19 in Hg, falling, then more rapidly
Visibility: 12 miles 
6-hr Max temp: 31F
6-hr Min temp: 29F
6-hr Precip: Trace
6-hr Snow: 0.0 ins.
Snow Depth: 13 ins.
BHO SA 1755 E12 OVC 12ZR- 222/30/29/0110G15/019/ PCPN VRY LGT ZR-E10B30/ 8/6// 4/013 58022 6000/ 10031 20029


SUMMARY FOR SUNDAY, FEBRUARY 14, 2021

TEMPERATURE (DEGREES F)
MAX.......34   NORMAL.....37
MIN.......24   NORMAL.....19
MEAN......29   NORMAL.....28

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL.........+1
TOTAL DEPARTURE FOR THE MONTH..................... 0 [-0.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............36  DEPARTURE.......-1
TOTAL HEATING UNITS FOR THE MONTH..............536  DEPARTURE.......-1
TOTAL HEATING UNITS FOR THE SEASON............3580  DEPARTURE.....-488
TOTAL HEATING UNITS LAST SEASON TO DATE.......3668  DEPARTURE......-88

PEAK WIND GUST (MPH):
                     420C/Official..............19 ENE @ 12:50 A.M.
                     AEROVANE (south tower).....16 ENE @  1:08 A.M. 
                     ASOS.......................18 ENE @ 12:51 A.M.
                     DAVIS #1...................18 E   @ 12:50 A.M.
                     DAVIS #2 (south tower).....18 ENE @ 12:54 A.M.
                     RMY........................19     @ 12:49 A.M
                     VECTOR.....................20     @ 12:50 A.M.
                     MERLIN.....................N/A

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL..................12 ENE @ 12:56 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................13 E   @  1:18 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............14 E   @ 12:51 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............14 ENE @ 12:56 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE....................13 ESE @ 12:49 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE.................13     @ 12:49 A.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL.... 5.0 NNW [119 total miles]
                     ASOS................... 5.1     
                     DAVIS #1............... 5.6 NE  
                     DAVIS #2............... 5.6 NNE  
                     RMY.................... 5.2 NE
                     VECTOR................. 5.6


PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M......Trace  DEPARTURE....-0.15
                             ASOS.............0.00
TOTAL PRECIPITATION FOR THE MONTH.............3.69  DEPARTURE....+1.76
                             ASOS.............3.92
TOTAL PRECIPITATION FOR THE YEAR..............6.01  DEPARTURE....-0.27
                              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....+22.1
TOTAL SNOWFALL FOR THE SEASON.................62.4  DEPARTURE....+22.4


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/+11/0.00/0.0/220/38      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/+1/1.86/12.7/000/00      53 NE   AERO 65 NE   RMY 62
02/02   34/29/32/+6/0.91/1.6/000/00       52 NNE  AERO 55 NE   RMY 58
02/03   34/26/30/+4/0.01/0.2/036/06       20 NW   AERO 20 NW   RMY 22
02/04   37/26/32/+6/0.02/0.7/158/26       23 NW   AERO 22 NW   RMY M       
02/05   39/26/33/+7/0.01/T/000/00         33 S    AERO 32 S    RMY 30
02/06   40/28/34/+8/0.00/0.0/595/97       42 WSW  AERO 41 WSW  RMY 47
02/07   35/25/30/+3/0.71/11.6/000/00      27 WNW  AERO 28 WNW  RMY 30
02/08   27/13/20/-7/0.00/0.0/619/100      29 NW   AERO 31 WNW  RMY 32
02/09   27/18/23/-4/0.17/2.2/000/00       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
02/12   25/8/17/-10/0.00/0.0/.../..       32 NW   AERO 35 NW   RMY 36
02/13   27/15/21/-7/0.00/0.0/.../..       20 NNW  AERO 20 NNW  RMY 23
02/14   34/24/29/+1/0.00/0.0/.../..       19 ENE  AERO 16 ENE  RMY 19

The low since midnight is 29F, the daily normal low is 19F

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 15
HIGH 60F IN 1954
LOW -18F IN 1943
PRECIP 1.28 INCHES IN 1950
SNOWFALL 14.4 INCHES IN 2015
PEAK GUST 94e MPH WNW IN 1946

RECORDS FOR FEBRUARY 16
HIGH 62F IN 1954
LOW -16F IN 1943
PRECIP 1.91 INCHES IN 1958
SNOWFALL 18.6 INCHES IN 1958
PEAK GUST 78 MPH W IN 1967

TODAY'S REPORT PREPARED BY: Matt Douglas