Wednesday, March 10, 2021

| March 10, 2021 | Reply

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

WEDNESDAY, MARCH 10, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0605E
SUNSET:  1745E

ANOTHER MILD DAY WITH DECREASING VISIBILITY AND
LIGHT WINDS THIS MORNING….

Today we observed 75 miles this morning, dropping to
60 miles this afternoon due to increasing haze. Wind
was less than 5 mph this morning, increasing to 10 mph
on average with a max gust of 20 mph. Pressure has
started to steadily decline, and humidity is only 30%
by 3 P.M.

The high so far today is 50F, 8 degrees above the daily
normal max of 42F. The low since midnight is 32F, 8 degrees
above the daily average low of 24F.

PRELIMINARY STATS FOR FEBRUARY 2021

TEMPERATURE, Deg. F
Avg. Max. 35.2 [-1.6]
Avg. Min. 22.9 [+3.8]
Mean      29.1 [+1.2]
24-hour corrected mean: 28.8
Max. for month: 49F on the 24th
Min. for month: 8F on the 12th and 19th

HEATING DEGREE DAYS
Total heating units:   1001 [-36]
Total for the season:  4045 [-523]
Total for last season: 4102

PRECIPITATION, Inches
Total: 5.68 [+1.61]
Greatest in 24 hrs: N/A

SNOWFALL, Inches
Total: 39.0 [+12.7]
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:   WNW [16%]
Peak gust and direction:     53 NE on the 1st

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes: N/A

Today’s Observations:

7 A.M.
Weather: Scattered cirrostratus
Temperature: 33F; Dew Point: 25F; Relative Humidity: 73%
Wind: NE @ 3 kts
Sea-level pressure: 30.54 in Hg; rising steadily
Visibility: 75 miles
6-hr Max temp: 50F
6-hr Min temp: 33F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: Trace
BHO SA 1155 250 SCT 75 341/33/25/0403/054/ WND L/V/ 8/006
4/000 51011 10050 20033

10 A.M.
Weather: Scattered cirrostratus
Temperature: 43F; Dew Point: 26F; Relative Humidity: 50%
Wind: S @ 4 kts, light and variable
Sea-level pressure: 30.57 in Hg; rising steadily
Visibility: 65 miles, hazy
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 250 SCT 65 354/43/26/1704/057/ WND L/V/ 8/006
51013

1 P.M.
Weather: Broken cirrostratus
Temperature: 43F, Dew point: 27F; Relative Humidity: 41%
Wind: SSE @ 11G15 kts
Sea-level pressure: 30.51 in Hg; falling steadily
Visibility: 60 miles
6-hr Max temp: 50F
6-hr Min temp: 33F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: Trace
BHO SA 1755 250 BKN 60 336/43/27/1511G15/051/ 8/006 4/000 58018
10050 20033

SUMMARY FOR TUESDAY, MARCH 9, 2021

TEMPERATURE (DEGREES F)
MAX…….56   NORMAL…..42
MIN…….30   NORMAL…..24
MEAN……43   NORMAL…..33

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…….+10
TOTAL DEPARTURE FOR THE MONTH……………….-29 [-3.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………22  DEPARTURE……-10
TOTAL HEATING UNITS FOR THE MONTH…………..325  DEPARTURE……+29
TOTAL HEATING UNITS FOR THE SEASON…………4370  DEPARTURE…..-494
TOTAL HEATING UNITS LAST SEASON TO DATE…….4352  DEPARTURE……+18

PEAK WIND GUST (MPH):
420C/Official…………..32 WNW @  2:32 P.M.
AEROVANE (south tower)…..35 WNW @  1:48 P.M.
ASOS…………………..33 WNW @  2:32 P.M.
DAVIS #1……………….34 WNW @  2:29 P.M.
DAVIS #2 (south tower)…..34 W   @  1:51 P.M.
RMY……………………37     @  2:29 P.M.
VECTOR…………………39     @  2:29 P.M.
MERLIN…………………34

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………24 WNW @  2:32 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 W   @  1:59 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………25 NW  @  2:32 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………25 W   @  1:51 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..23 NW  @  2:30 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..23     @  2:29 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……13.6 SSW [326 total miles]
ASOS…………………13.1
DAVIS #1……………..13.8 WNW
DAVIS #2……………..14.0 W
RMY………………….13.0 WNW
VECTOR……………….13.7

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………….0.13  DEPARTURE….-1.43
ASOS………….0.16
TOTAL PRECIPITATION FOR THE YEAR…………..8.13  DEPARTURE….-1.85
ASOS…………8.42

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………  0.0  DEPARTURE…. -0.5
TOTAL SNOWFALL FOR THE MONTH……………… 0.1  DEPARTURE…. -4.5
TOTAL SNOWFALL FOR THE SEASON……………..72.5  DEPARTURE….+21.4

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/-4/0.00/0.0/436/70       26 WNW  AERO 25 WNW  RMY 28
02/11   31/15/23/-4/0.00/0.0/526/84       28 NW   AERO 26 NW   RMY 31
02/12   25/8/17/-10/0.00/0.0/421/67       32 NW   AERO 35 NW   RMY 36
02/13   27/15/21/-7/0.00/0.0/252/40       20 NNW  AERO 20 NNW  RMY 23
02/14   34/24/29/+1/0.00/0.0/000/00       19 ENE  AERO 16 ENE  RMY 19
02/15   31/27/29/+1/0.11/0.0/000/00       21 NNE  AERO 21 NNE  RMY 22
02/16   44/29/37/+9/0.63/0.0/000/00       39 W    AERO 41 W    RMY 43
02/17   30/19/25/-3/0.00/0.0/552/86       40 W    AERO 41 WNW  RMY 40
02/18   29/21/25/-4/0.13/1.7/000/00       24 ENE  AERO 24 ENE  RMY 25
02/19   30/24/27/-2/0.66/7.7/000/00       24 NE   AERO 23 NE   RMY 24
02/20   32/19/26/-3/0.02/0.5/156/24       32 NW   AERO 35 NW   RMY 38
02/21   33/15/24/-5/0.00/0.0/653/100      27 NW   AERO 28 NW   RMY 29
02/22   40/21/31/+2/0.22/T/020/03         41 S    AERO 41 SSE  RMY 44
02/23   43/31/37/+7/0.00/0.0/283/43       31 WNW  AERO 31 WNW  RMY 32
02/24   49/34/42/+12/0.00/0.0/602/91      39 SSW  AERO 39 SSW  RMY 42
02/25   43/28/30/+6/0.00/0.0/664/100      50 WNW  AERO 55 WNW  RMY 57
02/26   40/22/31/+1/0.00/0.0/620/93       22 WNW  AERO 22 WNW  RMY 21
02/27   47/29/38/+7/0.21/0.1/000/00       40 SSE  AERO 41 SSE  RMY 44
02/28   41/33/37/+6/0.01/0.0/000/00       24 NW   AERO 22 NW   RMY 25

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

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/…/..        69 WNW   AERO 78 WNW  RMY 78
03/02   27/10/19/-12/T/0.1/…/..        63 WNW   AERO 71 WNW  RMY 69
03/03   45/19/32/0/0.00/0.0/…/..       30 W     AERO 30 W    RMY 34
03/04   38/22/30/-2/0.00/0.0/…/..      46 NW    AERO 51 NW   RMY 53
03/05   31/18/25/-7/0.00/0.0/…/..      39 WNW   AERO 44 NW   RMY 45
03/06   33/15/24/-8/0.00/0.0/…/..      28 WNW   AERO 29 WNW  RMY 30
03/07   35/15/25/-8/0.00/0.0/…/..      21 NW    AERO 22 NW   RMY 23
03/08   38/19/29/-4/T/T/…/..           20 NW    AERO 20 NW   RMY 21
03/09   56/30/43/+10/T/T/…/..          32 WNW   AERO 35 WNW  RMY 37

03/10 The low since midnight is 32F, the daily normal low is 25F

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

RECORDS FOR MARCH 10
HIGH 69 IN 1977
LOW 2 IN 1984
PRECIP 2.00 INS. IN 1994
SNOWFALL 5.5 INS. IN 1918
PEAK GUST 80 MPH NW IN 1974

RECORDS FOR MARCH 11
HIGH 65 IN 1967
LOW 4 IN 1939, 1960
PRECIP 2.11 INS. IN 1901
SNOWFALL 6.3 INS. IN 1934
PEAK GUST 66e MPH W IN 1980

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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