Monday, January 15, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JANUARY 15, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

BANDS OF SNOW SHOWERS AND THE RETURN OF BELOW
SEASONABLE TEMPERATURES AFTER RECORD BREAKING WARMTH….

Our maximum temperatures dropped 39 degrees this weekend
between Saturday and Sunday. On Saturday we reached
a daily record breaking maximum of 60F. This 26F degrees
above the normal for 1/13. Then after a wind shift
temperatures began to drop and we recorded a high of 21F
yesterday. This is 12 degrees below the daily normal of
33F. Today temperatures have been even colder with a high
of 14F so far, which is 19F degrees below the daily normal.
Continuous although very light at times bands of snow
showers began after 5:00 AM this morning on top of Great
Blue Hill. So far we have measured 0.5 ins. by 1:00 PM.
Skies have remained overcast for most of the day with a
short break in the clouds midday to the west allowing for
75 miles of visibility. Most of the day visibility was
obscured by a distant fog.

Today’s Observations:

7 A.M.
Weather: Light snow and fog, overcast nimbostratus
Temperature: 11F; Dew Point: 5F; Wind: NNW at 10G16 kts
Sea-level pressure: 30.71 ins. Hg, rising then falling
Visibility: 5 miles, except E-WSW 15 miles
6-hr Max temp: 14F
6-hr Min temp: 11F
24-hr precip: 0.01 ins.
24-hr snowfall: 0.2 ins.
Snow depth: 0 ins.
BHO SA 1155 E26 OVC 5S-F 400/11/05/3410G16/071/ NEW SNW PST
24 HRS 0.2 INS VSBY E-WSW 15 DSNT FG E-WSW/ 8/6// 50005 MANUAL
70001 10014 20011

10 A.M.
Weather: Light snow, overcast nimbostratus
Temperature: 12F; Dew Point: 4F; Wind: NNW at 13G17 kts
Sea-level pressure: 30.71 ins. Hg, rising then falling
Visibility: 75 miles, except NNE-SSW 35
3-hr precip: 0.01 ins.
3-hr snowfall: 0.3 ins.
BHO SA 1455 E22 BKN 75S- 401/12/04/3413G17/071/ NEW SNW PST
3 HRS 0.3 INS VSBY NNE-SSW 35 DSNT FG ALQDS/ 8/600 50001 MANUAL
6001/ ASOS 60001

1 P.M.
Weather: Very light snow, overcast nimbostratus
Temperature: 13F; Dew Point: 6F; Wind: NNW at 11G16 kts
Sea-level pressure: 30.61 ins. Hg, falling, then more slowly
Visibility: 10 miles
6-hr Max temp: 14F
6-hr Min temp: 11F
6-hr precip: 0.01 ins.
6-hr snowfall: 0.3 ins.
Snow depth: 1 in.
BHO SA 1755 E15 OVC 10S- 366/13/06/3411G16/061/ NEW SNW PST
6 HRS 0.3 INS DSNT FG ALQDS PCPN VRY LGT/ 8/6// 4/001 58035 MANUAL
6001/ ASOS 60001 10014 20011

SUMMARY FOR SUNDAY, JANUARY 14, 2018

TEMPERATURE (DEGREES F)
MAX…..21 NORMAL…..33
MIN…..11 NORMAL…..17
MEAN….16 NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL………………………-9
TOTAL DEPARTURE FOR THE MONTH……………………..-57 [-4.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….49 DEPARTURE……….+9
TOTAL HEATING UNITS FOR THE MONTH…………606 DEPARTURE………+58
TOTAL HEATING UNITS FOR THE SEASON……….2728 DEPARTURE……..-124
TOTAL HEATING UNITS LAST SEASON TO DATE…..2515 DIFFERENCE…….+213

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….30 NW AT 1:05 A.M.*
AERO……………………30 NW AT 1:05 A.M.*
ASOS……………………30 NW AT 1:06 A.M.
DAVIS…………………..30 N/A AT 1:05 A.M.** RMY N/A
FASTEST MILE FOR YESTERDAY…………………23 NW AT 2:51 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………22 NW AT 12:59 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..21 N/A AT 12:59 A.M.**
AVERAGE WIND SPEED AND DIRECTION………….11.1 NW
ASOS………………….11.6
DAVIS…………………10.1 N/A
* LAST OF SEVERAL OCCURANCES
** 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……….3.97 DEPARTURE……+1.98
ASOS…………..4.39
TOTAL PRECIPITATION FOR THE YEAR………..3.97 DEPARTURE……+1.98
ASOS…………..4.39

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.2 DEPARTURE……..-0.4
TOTAL SNOWFALL FOR THE MONTH……………16.7 DEPARTURE……..+8.8
TOTAL SNOWFALL FOR THE SEASON…………..26.0 DEPARTURE……..+2.1

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 Low temp since midnight is 11F; 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 15
HIGH 64F IN 1995
LOW -16F IN 1957 [RECORD FOR MONTH] PRECIP 2.63 INS. IN 1958
SNOWFALL 8.8 INS. IN 1983
PEAK GUST 69e MPH SE IN 1940

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

TODAY’S REPORT PREPARED BY: Kaitlin Geagan