Wednesday, February 10, 2021

| February 10, 2021 | Reply

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

WEDNESDAY, FEBRUARY 10, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0649E
SUNSET:  1710E

A FAIR WEATHER DAY FOLLOWING SOME SNOWFALL
YESTERDAY AFTERNOON….

More snow fell last night, amounting to 2.2 inches frozen
and 0.17 inches liquid. Winter has decided to be a season
this year, since the top of Great Blue Hill has received
a total of 62.4 inches of snow since October 2020. This
is a nice 24.9 inches above the running average seasonal
total. We are also doing well in the rainfall department,
as we are 2.50 inches above normal on the month.

Today consists of fair weather with partly cloudy skies,
with a max visibility of 40 miles due to haze. Wind is
westerly with an average speed of 10 mph.

The high so far today is 31F, 5 degrees below the daily
average max of 36F. The low since midnight is 15F, 3
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: 3531

PRECIPITATION, Inches
Total: 2.32 [-2.03]
Greatest in 24 hrs: N/A

SNOWFALL, Inches
Total: 7.2 [-9.9]
Greatest in 24 hrs: N/A

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: N/A
Astronomical total minutes: N/A

Today’s Observations:

7 A.M.
Weather: Scattered cirrostratus, few cumulus offshore
Temperature: 16F; Dew Point: 13F; Relative Humidity: 88%
Wind: NW @ 11 kts
Sea-level pressure: 30.25 in Hg; rising steadily
Visibility: 10 miles, thin fog
6-hr Max temp: 22F
6-hr Min temp: 15F
24-hr Precip: 0.17 ins.
24-hr Snow: 2.2 ins.
Snow Depth: 17 ins.
BHO SA 1155 200 SCT 10 244/16/13/3211/025/ FEW CU OFFSHR
THN F ALQDS NEW SNW PST 24 HRS 2.2 INS/ 8/102 4/017 70017
51016 10022 10015

10 A.M.
Weather: Broken cirrostratus, few cumulus offshore
Temperature: 23F; Dew Point: 15F; Relative Humidity: 70%
Wind: NW @ 8 kts
Sea-level pressure: 30.30 in Hg; rising then falling
Visibility: 20 miles, hazy
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 250 BKN 20 260/23/15/3108/030/ FEW CU OFFSHR
HAZY/ 8/106 50016

1 P.M.
Weather: Broken cirrostratus and cumulus
Temperature: 30F, Dew point: 12F; Relative Humidity: 47%
Wind: NW @ 8G15 kts
Sea-level pressure: 30.25 in Hg, falling, then steady
Visibility: 35 miles, hazy
6-hr Max temp: 31F
6-hr Min temp: 16F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 16 ins.
BHO SA 1755 50 BKN 250 35 247/30/12/3108G15/025/ HAZY/ 8/106
4/016 56013 10031 20016

SUMMARY FOR TUESDAY, FEBRUARY 9, 2021

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

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……… -4
TOTAL DEPARTURE FOR THE MONTH…………………+24 [+2.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………42  DEPARTURE…… +4
TOTAL HEATING UNITS FOR THE MONTH…………..324  DEPARTURE….. -25
TOTAL HEATING UNITS FOR THE SEASON…………3364  DEPARTURE…..-516
TOTAL HEATING UNITS LAST SEASON TO DATE…….3510  DEPARTURE…..-146

PEAK WIND GUST (MPH):
420C/Official…………..16 N   @  5:05 P.M.
AEROVANE (south tower)…..16 N   @  5:03 P.M.
ASOS…………………..16 NNE @  5:06 P.M.
DAVIS #1……………….16 S   @  9:45 A.M.
DAVIS #2 (south tower)…..16 SSE @ 10:11 A.M.
RMY……………………17     @  5:36 P.M
VECTOR…………………17     @  5:36 P.M.
MERLIN…………………15

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………11 N   @  5:08 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….12 NNE @  5:07 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………12 SSE @  9:48 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………13 SE  @  9:48 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..12 S   @  9:46 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..12     @  9:45 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…..6.4 NE [253 total miles]
ASOS………………..6.9
DAVIS #1…………….6.8 NE
DAVIS #2…………….6.8 NE
RMY…………………6.7 ENE
VECTOR………………7.0

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.17  DEPARTURE….+0.04
ASOS………….0.17
TOTAL PRECIPITATION FOR THE MONTH………….3.69  DEPARTURE….+2.48
ASOS………….3.92
TOTAL PRECIPITATION FOR THE YEAR…………..6.01  DEPARTURE….+0.45
ASOS…………6.27

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..2.2  DEPARTURE…. +1.7
TOTAL SNOWFALL FOR THE MONTH………………29.0  DEPARTURE….+24.6
TOTAL SNOWFALL FOR THE SEASON……………..62.4  DEPARTURE….+24.9

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/+18/1.00/0.0/000/00      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/…/..        28 NW   AERO 29 NW   RMY 30
01/26   36/20/28/+3/0.17/2.4/…/..       18 E    AERO 18 E    RMY 20
01/27   33/27/30/+5/0.12/1.9/…/..       16 NNW  AERO 17 NNW  RMY 17
01/28   29/13/21/-4/0.09/0.9/…/..       39 NW   AERO 48 NW   RMY 42
01/29   15/4/10/-15/0.00/0.0/…/..       44 NW   AERO 46 NW   RMY 50
01/30   19/3/11/-15/0.00/0.0/…/..       24 NW   AERO 28 NW   RMY 27
01/31   23/2/13/-13/0.00/0.0/…/..       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 The low since midnight is 15F, 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 10
HIGH 56F IN 1909
LOW -8F IN 1899
PRECIP 1.34 INS. IN 1909
SNOWFALL 12.1 INS. IN 1926
PEAK GUST 64 MPH W IN 2001

RECORDS FOR FEBRUARY 11
HIGH 60F IN 1981
LOW -10F IN 1899
PRECIP 1.07 INCHES IN 1955
SNOWFALL 9.6 INCHES IN 1933
PEAK GUST 95 MPH S IN 1981

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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