Thursday, January 31, 2019
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JANUARY 31, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME
A VERY COLD AND DRY DAY WITH CLEAR SKIES
ATOP GREAT BLUE HILL….
Snow squalls between 7 and 8 P.M. last night
left a half inch on the ground, along with
0.05 inches of liquid in the gauge. Visibility
remained at 70 miles all day, and skies were
clear; save a few distant cumulus offshore.
Wind was westerly and light compared to
yesterday, where a max gust of 52 mph was
reached. Weather was fair and dry, with a
humidity of 35% being observed at 1 P.M.
The frontal passage last night not only
brought significant snow squalls, but
very low temperatures. The high temperature
so far today is 12F, 22 degrees below the daily
normal of 34F. The low since midnight is -2F,
which is 19 degrees below the daily normal
minimum of 17F.
Today’s Observations:
7 A.M.
Weather: Clear, few distant cumulus offshore
Temperature: -2F; Dew Point: -17F; Wind: W at 16G20 kts
Sea-level pressure: 30.21 ins. Hg, rising steadily
Visibility: 70 miles
6-hr Max temp: 2F
6-hr Min temp: -2F
24-hr Precip: 0.05 ins.
24-hr snowfall: 0.5 ins.
Snow depth: 1 in.
BHO SA 1155 CLR 70 230/-2/-17/2716G20/021/ FEW DSNT
CU NE-S/ 8/100 4/001 70005 53024 10002 21002
10 A.M.
Weather: Clear, few distant cumulus offshore
Temperature: 4F; Dew Point: -13F; Wind: W at 16G26 kts,
Peak wind: 30 MPH (26 kts) W at 9:47 A.M.
Sea-level pressure: 30.27 ins. Hg, rising steadily
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 70 252/4/-13/2716G26/027/ FEW DSNT
CU OFFSHR PK WND 2726/47/ 8/100 51022
1 P.M.
Weather: Clear, few distant cumulus offshore
Temperature: 11F; Dew Point: -12F; Wind: W at 14G21 kts
Sea-level pressure: 30.24 ins. Hg, falling steadily
Visibility: 70 miles
6-hr Max temp: 12F
6-hr Min temp: -2F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 1 in.
BHO SA 1755 CLR 70 264/11/-12/2714G21/024/ FEW DSNT
CU OFFSHR/ 8/100 4/001 58012 10012 21002
SUMMARY FOR WEDNESDAY, JANUARY 30, 2019
TEMPERATURE (DEGREES F)
MAX…..36 NORMAL…..34
MIN……3 NORMAL…..17
MEAN….20 NORMAL…..26
DEPARTURE FROM 30-YEAR NORMAL……………………-6
TOTAL DEPARTURE FOR THE MONTH…………………..+47 [+1.4 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..39 DEPARTURE………+6
TOTAL HEATING UNITS FOR THE MONTH…………1141 DEPARTURE……..-46
TOTAL HEATING UNITS FOR THE SEASON………..3437 DEPARTURE……..-54
TOTAL HEATING UNITS LAST SEASON TO DATE……3277 DIFFERENCE……+160
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..52 W AT 7:21 P.M.
AERO…………………….53 W AT 7:20 P.M.
ASOS…………………….54 WNW AT 8:42 P.M.
DAVIS……………………57 W AT 7:22 P.M. RMY 57
FASTEST MILE FOR YESTERDAY………………….38 WNW AT 9:21 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….35 W AT 9:21 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………38 W AT 9:21 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..16.4 W
ASOS…………………..15.8
DAVIS………………….16.4 W [266 deg.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.05 DEPARTURE…….-0.09
ASOS…………..0.04
TOTAL PRECIPITATION FOR THE MONTH……….5.35 DEPARTURE…….+1.13
ASOS…………..5.48
TOTAL PRECIPITATION FOR THE YEAR………..5.35 DEPARTURE…….+1.13
ASOS…………..5.48
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.5 DEPARTURE………..0
TOTAL SNOWFALL FOR THE MONTH…………….4.7 DEPARTURE…….-11.9
TOTAL SNOWFALL FOR THE SEASON…………..12.4 DEPARTURE…….-20.2
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/…./0.0/386/72 53 W AERO 53 W RMY 54
01/02 34/24/29/+2/…./…/432/81 22 NW AERO 22 NW RMY N/A
01/03 42/28/35/+9/0.01/T/228/43 28 WNW AERO 30 WNW RMY 30
01/04 43/30/37/+11/…./…/354/66 29 SW AERO 29 SW RMY 29
01/05 41/32/37/+11/1.19/000/000/00 26 NE AERO 25 NNW RMY 27
01/06 42/21/32/+6/0.00/0.0/300/56 42 NW AERO 46 NW RMY 50
01/07 26/14/20/-6/…/…/474/88 37 NW AERO 41 NW RMY N/A
01/08 40/24/32/+6/…/…/000/00 24 SSE AERO 23 SSE RMY N/A
01/09 42/31/37/+11/…/…/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/…/1.6/198/36 30 E AERO 30 E RMY N/A
01/20 33/3/18/-7/…/…/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/…/.. 28 NW AERO 30 NW RMY 29
01/23 46/15/31/+6/0.00/0.0/…/.. 37 SSW AERO 39 SSW RMY N/A
01/24 57/31/44/+19/1.44/0.0/…/.. 77 S AERO 79 S RMY N/A
01/25 37/23/30/+5/0.00/0.0/…/.. 41 WNW AERO 46 WNW RMY N/A
01/26 33/17/25/0/0.00/0.0/…/.. 25 W AERO 25 W RMY 27
01/27 44/24/34/+9/0.00/0.0/…/.. 39 S AERO 39 S RMY 41
01/28 30/19/28/+3/…./…/…/.. 28 NW AERO 28 NW RMY N/A
01/29 32/19/26/+1/…./…/…/.. 22 SE AERO 21 E RMY N/A
01/30 36/3/20/-6/…./0.5/…/.. 52 W AERO 53 W RMY 57
01/31 Low temp since midnight is -2F; normal low is 17F
*Official gust chart reading low
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR JANUARY 31
HIGH 58F IN 1913, 1947, 2013
LOW -12F IN 1920
PRECIP 1.03 INS. IN 1914
SNOWFALL 9.0 INS. IN 1898
PEAK GUST 75 MPH NW IN 1974
RECORDS FOR FEBRUARY 1
HIGH 65F IN 1989
LOW -9F IN 1920
PRECIP 1.30 INS. IN 1898
SNOWFALL 11.0 INS. IN 1898
PEAK GUST 66e MPH SSW IN 1951
TODAY’S REPORT PREPARED BY: Benjamin Turner
