Saturday, February 9, 2019

| February 9, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, FEBRUARY 9, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

WINDY, CLEAR DAY ON TOP OF GREAT BLUE HILL…

Windchill remains low, as the air temperature has stayed
in the 20’s for most of the day and the wind from the WNW
is frequently gusting over 40 knots. The high so far today
is 31F, 5 degrees below the normal maximum temperature for
today of 36F. Visibility has remained excellent, fluctuating
between 80 and 90 miles since sunrise. There was no new
precipitation this morning, and clear skies have persisted
throughout the day with only a few passing fair weather
cumulus clouds in sight.
PRELIMINARY STATS FOR JANUARY 2019

TEMPERATURE, Deg. F
Avg. Max. 34.3 [+0.5]
Avg. Min. 17.9 [+0.8]
Mean      26.1 [+0.6]
24-hour corrected mean: 26.6
Max. for month: 57F on  24th
Min. for month: -2F on the 21st and 31st

HEATING DEGREE DAYS
Total heating units:   1200 [-26]
Total for the season:  3496 [-35]
Total for last season: 3321

PRECIPITATION, Inches
Total: 5.35 [+1.00]
Greatest in 24 hrs: 2 inches on the 19th-20th

SNOWFALL, Inches
Total: 4.7 [-12.4]
Greatest in 24 hrs: 4.2 inches on the 19th-20th

WIND, mph
Avg. uncorrected wind speed: 13.4
Avg. corrected wind speed: 13.7
Prevailing wind direction: NW at 19%
Peak gust and direction: 77 S on 24th

SUNSHINE:
Campbell-Stokes card minutes: 8988 minutes of possible 17130 or 52%
Astronomical total minutes:   9273 minutes of possible 17650 or 53%

Today’s Observations:

7 A.M.
Weather: Clear, few cumulus in all directions
Temperature: 20F; Dew Point: 4F; Wind: WNW at 16G29 kts
Peak wind: 39 knots WNW at 6:19 A.M.
Sea-level pressure: 30.28 ins. Hg, rising, then more quickly
Visibility: 80 miles
6-hr Max temp: 25F
6-hr Min temp: 20F
24-hr Precip: 0.05 ins.
24-hr snowfall: 0.0 ins
Snow depth: 0 ins.
BHO SA 1155 CLR 80 254/20/4/3016G29/028/ FEW CU ALQDS
PK WND 3039/19// 8/100 70005 53032 10025 20020

10 A.M.
Weather: Clear, few cumulus in all directions
Temperature: 25F; Dew Point: 7F; Wind: WNW at 26G38 kts
Peak wind: 42 knots WNW at 9:20 A.M.
Sea-level pressure: 30.35 ins. Hg, rising steadily
Visibility: 90 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 90 276/25/7/3026G38/035/ FEW CU ALQDS
PK WND 3042/20// 8/100 51022

1 P.M.
Weather: Clear, few cumulus in all directions
Temperature: 31F; Dew Point: 18F; Wind: WNW at 19G30 kts
Peak wind: 33 knots WNW at 12:01 P.M.
Sea-level pressure: 30.40 ins. Hg, rising steadily
Visibility: 90 miles
6-hr Max temp: 31F
6-hr Min temp: 20F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 CLR 90 295/31/18/3019G30/040/ FEW CU ALQDS
PK WND 3033/01// 8/100 51019 10031 20020

SUMMARY FOR FRIDAY, FEBRUARY 8, 2019

TEMPERATURE (DEGREES F)
MAX…..51   NORMAL…..35
MIN…..27   NORMAL…..18
MEAN….39   NORMAL…..27

DEPARTURE FROM 30-YEAR NORMAL…………………..+12
TOTAL DEPARTURE FOR THE MONTH…………………..+58 [+7.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..26   DEPARTURE……..-12
TOTAL HEATING UNITS FOR THE MONTH………….252   DEPARTURE……..-59
TOTAL HEATING UNITS FOR THE SEASON………..3748   DEPARTURE……..-94
TOTAL HEATING UNITS LAST SEASON TO DATE……3621   DIFFERENCE……+127

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..46 W   AT 6:35 P.M.
AERO…………………….46 WNW AT 6:07 P.M.
ASOS…………………….48 W   AT 6:09 P.M.
DAVIS……………………49 WNW AT 6:09 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….38 WNW AT 6:35 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….35 W   AT 6:36 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………38 W   AT 6:35 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..15.1 WNW
ASOS…………………..15.4
DAVIS………………….15.0 W [277 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.05  DEPARTURE…….-0.08
ASOS…………..0.06
TOTAL PRECIPITATION FOR THE MONTH……….0.77  DEPARTURE…….-0.31
ASOS…………..0.69
TOTAL PRECIPITATION FOR THE YEAR………..6.12  DEPARTURE…….+0.69
ASOS…………..6.20

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………0  DEPARTURE……..-0.5
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE……..-3.9
TOTAL SNOWFALL FOR THE SEASON…………..12.4  DEPARTURE…….-24.6

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 54/29/42/+15/0.37/0.0/386/72         53 W   AERO 53 W   RMY 54
01/02 34/24/29/+2/0.00/T/432/81            22 NW  AERO 22 NW  RMY N/A
01/03 42/28/35/+9/0.01/0.0/228/43          28 WNW AERO 30 WNW RMY 30
01/04 43/30/37/+11/0.00/0.0/354/66         29 SW  AERO 29 SW  RMY 29
01/05 41/32/37/+11/1.15/T/000/00           26 NE  AERO 25 NNW RMY 27
01/06 42/21/32/+6/0.00/T/300/56            42 NW  AERO 46 NW  RMY 50
01/07 26/14/20/-6/0.00/0.0/474/88     37 NW  AERO 41 NW  RMY N/A
01/08 40/24/32/+6/0.02/T/000/00            24 SSE AERO 23 SSE RMY N/A
01/09 42/31/37/+11/0.11/0.0/084/16         44 W   AERO 46 WNW RMY 45
01/10 32/20/26/+1/T/T/090/17               37 NW  AERO 41 NW  RMY 43
01/11 26/12/19/-6/0.00/0.0/366/68          36 WNW AERO 37 WNW RMY 38
01/12 26/9/18/-7/0.00/0.0/486/89           32 NW  AERO 32 NW  RMY 29
01/13 25/11/18/-7/0.00/0.0/456/84          18 NNW AERO 16 NW  RMY N/A
01/14 27/20/24/-1/0.00/0.0/120/22          20 NNE AERO 17 N   RMY N/A
01/15 34/18/26/1/0.00/0.0/402/73     22 NW  AERO 21 NNW RMY N/A
01/16 34/23/29/+4/0.00/0.0/270/47          33 W   AERO 32 W   RMY 35
01/17 27/13/20/-5/0.00/0.0/480/87          30 NNW AERO 28 NW  RMY N/A
01/18 40/21/31/+6/0.00/0.0/156/28          18 WNW AERO 18 WNW RMY N/A
01/19 31/24/28/+3/0.23/1.6/198/36          30 E   AERO 30 E   RMY N/A
01/20 33/3/18/-7/1.77/2.6/000/00           39 ENE AERO 43 ENE RMY 39
01/21 3/-2/1/-24/0.00/0.0/348/62           32*WNW AERO 41 WNW RMY M
01/22 24/0/12/-13/0.00/0.0/522/93          28 NW  AERO 30 NW  RMY 29
01/23 46/15/31/+6/0.00/0.0/000/00          37 SSW AERO 39 SSW RMY N/A
01/24 57/31/44/+19/1.44/0.0/000/00         77 S   AERO 79 S   RMY N/A
01/25 37/23/30/+5/0.00/0.0/378/66          41 WNW AERO 46 WNW RMY N/A
01/26 33/17/25/0/0.00/0.0/534/94           25 W   AERO 25 W   RMY 27
01/27 44/24/34/+9/0.00/0.0/480/84          39 S   AERO 39 S   RMY 41
01/28 30/19/28/+3/0.00/0.0/348/60          28 NW  AERO 28 NW  RMY N/A
01/29 32/19/26/+1/0.06/T/072/13            22 SE  AERO 21 E   RMY N/A
01/30 36/3/20/-6/0.19/0.5/504/88           52 W   AERO 53 W   RMY 57
01/31 14/-2/6/-20/0.00/0.0/570/99          33 WNW AERO 35 WNW RMY N/A

*Official gust chart reading low

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 19/5/12/-14/0.00/0.0/…/..          29 W   AERO 28 W   RMY N/A
02/02 30/7/19/-7/0.00/0.0/…/..           32 WSW AERO 32 WSW RMY 31
02/03 38/27/26/+7/0.00/0.0/…/..          26 S   AERO 25 S   RMY N/A
02/04 59/33/46/+20/0.00/0.0/…/..         25 SSW AERO 28 SSW RMY N/A
02/05 62/39/51/+25/0.00/0.0/…/..         30 WNW AERO 29 WNW RMY 32
02/06 39/28/34/+8/…./…/…/..          24 NNW AERO 23 NNW RMY N/A
02/07 37/31/34/+7/…./…/…/..     28 ENE AERO 24 ENE RMY 28
02/08 51/27/39/+12/…./…/…/..         46 W   AERO 46 WNW RMY 51

02/08 Low temp since midnight is 31F; normal low is 18F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR FEBRUARY 9
HIGH 58F IN 1990
LOW -21F IN 1934 [LOWEST TEMPERATURE ON RECORD]
PRECIP 2.12 INS. IN 1969
SNOWFALL 16.9 INS. IN 2016
PEAK GUST 89 MPH NE IN 1969

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

TODAY’S REPORT PREPARED BY: Samantha Richard

Category: Daily Discussions

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