Tuesday, January 16, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JANUARY 16, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

RETURN OF SEASONABLE TEMPERATURES WITH MOSTLY CLOUDY SKIES…

So far, the temperatures today are right around normal for this
time of year. With a maximum of 31F and minimum of 18F by the
1:00 P.M. EST observation, the average temperature is currently
25F which is the normal average temperature for January 16th.
Yesterday, the average was only 15F, which is 10F below normal,
due to the maximum of 18F and minimum of 11F. Blue Hill’s
cumulative temperature departure for January is currently -67F,
or -4.3F per day.

Skies were mostly cloudy today, with scattered to broken
stratocumulus in the morning and overcast altostratus in the
afternoon. Visibility was limited by distant haze in most of
the area, but it was able to increase from 20 miles in the
morning to 60 miles in the afternoon, with a section of 80
miles in the E-S. Yesterday, a total of 0.5 ins. of snow fell,
which equaled 0.02 ins. of liquid precipitation. Winds were
relatively calm this afternoon, as a peak gust of just 15 MPH
was measured.

Today’s Observations:

7 A.M.
Weather: Scattered stratocumulus, few altocumulus in all
directions, thin smoke layer along horizon NW-SW
Temperature: 19F; Dew Point: 14F; Wind: Estimated E at 2 kts,
Wind speed: Light
Sea-level pressure: 30.53 ins. Hg, falling, then rising
Visibility: 20 miles, distant haze in all directions
6-hr Max temp: 19F
6-hr Min temp: 18F
24-hr precip: 0.01 ins.
24-hr snowfall: 0.3 ins.
Snow depth: 0 ins.
BHO SA 1155 021 SCT 30 337/19/14/E0802/053/ NEW SNW PST
24 HRS 0.3 INS FEW AC ALQDS THN K LYR ALG HRZN NW-SW DSNT
HZ ALQDS WND LGT/ 8/530 53004 MANUAL 70001 10019 20018

10 A.M.
Weather: Broken stratocumulus, broken cirrus
Temperature: 26F; Dew Point: 19F; Wind: SSW at 4 kts,
Wind speed: Light
Sea-level pressure: 30.54 ins. Hg, falling, then rising
Visibility: 40 miles, distant haze in all directions
BHO SA 1455 E022 BKN 250 BKN 40 341/26/19/2004/054/ DSNT
HZ ALQDS WND LGT/ 8/501 53004

1 P.M.
Weather: Overcast altostratus, few stratocumulus in all directions
Temperature: 31F; Dew Point: 21F; Wind: SSW at 5 kts,
Wind speed: Light
Sea-level pressure: 30.47 ins. Hg, falling, then less quickly
Visibility: 60 miles, except 80 miles E-S; distant haze SW-NE
6-hr Max temp: 31F
6-hr Min temp: 19F
BHO SA 1755 E084 OVC 60 320/31/21/2105/047/ FEW SC ALQDS VSBY
E-S 80 DSNT HZ SW-NE WND LGT/ 8/52/ 56021 10031 20019

SUMMARY FOR MONDAY, JANUARY 15, 2018

TEMPERATURE (DEGREES F)
MAX…..18 NORMAL…..33
MIN…..11 NORMAL…..17
MEAN….15 NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL……………………..-10
TOTAL DEPARTURE FOR THE MONTH……………………..-67 [-4.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….50 DEPARTURE………+10
TOTAL HEATING UNITS FOR THE MONTH…………656 DEPARTURE………+69
TOTAL HEATING UNITS FOR THE SEASON……….2728 DEPARTURE……..-114
TOTAL HEATING UNITS LAST SEASON TO DATE…..2551 DIFFERENCE…….+227

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23 NNW AT 12:57 P.M.
AERO……………………21 N AT 1:36 P.M.
ASOS……………………24 N AT 1:09 P.M.
DAVIS…………………..23 N/A AT 3:29 P.M.* RMY 23
FASTEST MILE FOR YESTERDAY…………………15 NNW AT 1:09 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………16 N AT 1:10 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..16 N/A AT 12:57 P.M.*
AVERAGE WIND SPEED AND DIRECTION………….10.9 NNW
ASOS………………….11.6
DAVIS…………………10.3 N/A
* DAVIS DIRECTION MALFUCNTIONING

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01 DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.98 DEPARTURE……+1.84
ASOS…………..4.40
TOTAL PRECIPITATION FOR THE YEAR………..3.98 DEPARTURE……+1.84
ASOS…………..4.40

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.3 DEPARTURE……..-0.2
TOTAL SNOWFALL FOR THE MONTH……………17.0 DEPARTURE……..+8.5
TOTAL SNOWFALL FOR THE SEASON…………..26.3 DEPARTURE……..+1.8

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

1/01 11/-5/3/-24/0.00/0.0/…/.. 30 NW AERO 30 NW RMY 31
1/02 15/-2/7/-20/0.00/0.0/…/.. 26 W AERO 25 W RMY 26
1/03 28/11/20/-6/0.00/0.0/…/.. 23 WSW AERO 20 WSW RMY N/A
1/04 28/18/23/-3/1.66/16.5/000/00 54 NNW AERO 60 NNW RMY 64
1/05 18/2/10/-16/0.00/0.0/…/.. 53 W AERO 53 W RMY 57
1/06 10/-2/4/-22/0.00/0.0/…/.. 43 WSW AERO 47 WSW RMY 47
1/07 14/-8/3/-23/0.00/0.0/…/.. 37 WNW AERO 35 WNW RMY N/A
1/08 33/14/24/-2/T/T/…/.. 40 S AERO 40 S RMY 42
1/09 40/25/33/+7/T/T/…/.. 37 W AERO 35 W RMY 33
1/10 36/20/28/+3/0.00/0.0/…/.. 30 W AERO 30 W RMY N/A
1/11 50/32/41/+16/0.00/0.0/…/.. 33 S AERO 32 S RMY 34
1/12 60/45/53/+28/…./0.0/…/.. 56 S AERO 56 S RMY 55
1/13 60/17/39/+14/T/0.0/…/.. 58 SSW AERO 60 SSW RMY 62
1/14 21/11/16/-9/0.00/0.0/…/.. 30 NW AERO 30 NW RMY N/A
1/15 18/11/15/-10/…./…/…/.. 23 NNW AERO 21 N RMY 23

1/16 Low temp since midnight is 18F; normal low is now 17F

DAILY RECORDS FOR JANUARY 2018

01/04/18: NEW DAILY RECORD MAXIMUM SNOWFALL OF 16.5 INS.
PREVIOUS RECORD WAS 8.6 INS. SET IN 1923 AND
TIED IN 1942

01/07/18: DAILY RECORD LOW MINIMUM TEMPERATURE OF -8F,
PREVIOUS RECORD OF -7F WAS SET IN 1896

01/12/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 45F,
PREVIOUS RECORD OF 42F WAS SET IN 2017

DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 60F,
PREVIOUS RECORD OF 59F WAS SET IN 2017

01/13/18: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 60F,
PREVIOUS RECORD OF 57F WAS SET IN 1890 AND
TIED IN 1932

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

RECORDS FOR JANUARY 16
HIGH 63F IN 1995
LOW -12F IN 2004
PRECIP 1.32 INS. IN 1936
SNOWFALL 14.0 INS. IN 1965
PEAK GUST 79 MPH WNW IN 1960

RECORDS FOR JANUARY 17
HIGH 55F IN 1973,1995
LOW -8F IN 1907,1982
PRECIP 1.43 INS. IN 1956
SNOWFALL 13.4 INS. IN 1956
PEAK GUST 62 MPH S IN 1994

TODAY’S REPORT PREPARED BY: Lizzy Suzedell