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Friday, January 20, 2017

January 20, 2017

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, JANUARY…

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JANUARY 20, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST SKIES WITH DISTANT FOG AND HAZE

Visibility decreased throughout the day going from 70 miles
in the morning to 40 miles in the afternoon due to distant
fog and haze in all directions. Winds were light and variable
all day and calm winds were reported at the 10 AM ob.
Temperatures were still above average for the day but did not
reach the same levels as yesterday due to the constant overcast
skies.

Today’s Observations:

7 A.M.
Weather: Overcast stratus
Temperature: 33F; Dew Point: 29F; Wind: WSW at 6 kts,
Wind Speed: Light
Sea-level pressure: 30.01 ins. Hg, falling, then rising
Visibility: 70 miles, distant fog in all directions
6-hr Max temp: 33F
6-hr Min temp: 30F
24-hr precip: 0.00 in.
24-hr snowfall: 0.00 in.
BHO SA 1155 E25 OVC 70 162/33/29/3406/001/ DSNT FG ALQDS WND LGT/
8/6// 55003 10033 20030

10 A.M.
Weather: Overcast stratus
Temperature: 36F; Dew Point: 30F; Wind: Calm,
Wind: Light and variable
Sea-level pressure: 30.01 ins. Hg, rising, then falling
Visibility: 60 miles, distant fog in all directions
BHO SA 1455 E25 OVC 60 168/36/30/0000/001/ DSNT FG ALQDS WND L/V/
8/6// 50006

1 P.M.
Weather: Overcast stratocumulus
Temperature: 39F; Dew Point: 30F; Wind: Estimated SE at 3 kts,
Wind Speed: Light
Sea-level pressure: 29.97 ins. Hg, falling, then more quickly
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 39F
6-hr Min temp: 32F
BHO SA 1755 E24 OVC 40 149/39/30/E1403/997/ DSNT HZ ALQDS WND LGT/
8/5// 58019 10039 20032

SUMMARY FOR THURSDAY, JANUARY 19, 2017

TEMPERATURE (DEGREES F)
MAX…..44   NORMAL…..33
MIN…..30   NORMAL…..17
MEAN….37   NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL…………………..+12
TOTAL DEPARTURE FOR THE MONTH………………….+108 [+5.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..28   DEPARTURE………-12
TOTAL HEATING UNITS FOR THE MONTH………….641   DEPARTURE……..-107
TOTAL HEATING UNITS FOR THE SEASON………..2673   DEPARTURE……..-379
TOTAL HEATING UNITS LAST SEASON TO DATE……2327   DIFFERENCE…….+346

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….21 NNW AT 11:16 P.M.
ASOS……………………20 N   AT 11:18 P.M.
DAVIS…………………..18 N   AT 10:39 P.M.  RMY 20
FASTEST MILE FOR YESTERDAY…………………13 N   AT 11:30 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………14 N   AT 11:55 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..13 NNE AT 11:54 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..7.3 NW
ASOS…………………..7.6
DAVIS………………….4.1 NNW [340 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.16  DEPARTURE……+0.46
ASOS…………..3.46
TOTAL PRECIPITATION FOR THE YEAR………..3.16  DEPARTURE……+0.46
ASOS…………..3.46

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.6
TOTAL SNOWFALL FOR THE MONTH……………11.2  DEPARTURE…….+0.5
TOTAL SNOWFALL FOR THE SEASON…………..19.0  DEPARTURE…….-7.7

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

1/1   41/29/35/+8/0.09/0.0/533/97           35 W   AERO 36 W   RMY 34
1/2   38/29/34/+7/0.00/0.0/011/02           21 E   AERO 20 E   RMY N/A
1/3   42/37/40/+14/1.14/0.0/000/00          39 ENE AERO 41 ENE RMY 34
1/4   44/30/37/+11/0.11/T/000/00            41 WNW AERO 46 WNW RMY 45
1/5   30/23/27/+1/0.00/0.0/343/62           37 W   AERO 39 W   RMY 38
1/6   30/20/25/-1/0.05/1.7/072/13           20 W   AERO 20 W   RMY N/A
1/7   22/14/18/-8/0.74/9.5/000/00           32 NNW AERO 39 NNW RMY 38
1/8   20/06/13/-13/0.01/T/512/92            26 NNW AERO 29 NNW RMY N/A
1/9   17/04/11/-15/0.00/0.0/335/60          23 SSW AERO 23 SSW RMY 25
1/10  41/14/28/+3/0.18/0.0/…/..           35 SE  AERO 37 SE  RMY N/A
1/11  53/40/47/+22/0.13/0.0/…/..          51 SSW AERO 48 SSW RMY 57
1/12  59/42/51/+26/0.15/0.0/…/..          37 SSW AERO 40 S   RMY 40
1/13  55/23/39/+14/0.00/0.0/…/..          39 WNW AERO 43 WNW RMY 42
1/14  30/14/22/-3/0.00/0.0/…/..           20 SSW AERO 20 SSW RMY 22
1/15  35/23/29/+4/0.00/0.0/…/..           28 NW  AERO 28 NW  RMY 28
1/16  40/22/31/+6/0.00/0.0/…/..           28 SW  AERO 25 SW  RMY 27
1/17  40/29/35/+10/…./T/…/..            23 E   AERO 23 E   RMY 25
1/18  38/31/30/+10/…./T/…/..            30 ENE AERO 29 ENE RMY 26
1/19  44/30/27/+12/…./T/…/..            21 NNW AERO 20 NNW RMY 20

1/19 Low temp since midnight is 30F; normal low is now 17F

DAILY RECORDS FOR JANUARY 2017

1/12/17: NEW DAILY RECORD HIGH MAXIMUM TEMP. OF 59F,
PREVIOUS RECORD WAS 57F SET 1913 AND TIED IN 1975
1/12/17: NEW DAILY RECORD HIGH MINIMUM TEMP. OF 42F,
PREVIOUS RECORD WAS 40F SET 2006

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

RECORDS FOR JANUARY 20
HIGH 59F IN 1951
LOW -9F IN 1901
PRECIP 1.95 INS. IN 1978
SNOWFALL 19.0 INS. IN 1978
PEAK GUST 76e MPH NE IN 1978

RECORDS FOR JANUARY 21
HIGH 65F IN 1906
LOW -4F IN 1888,1893
PRECIP 2.49 INS. IN 1979
SNOWFALL 9.0 INS. IN 2014
PEAK GUST 78e MPH SE IN 1979

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle and Kaitlin Geagan

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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
Part I — Data Use Policy
§ 01

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Effective January 1, 2025 · Blue Hill Observatory & Science Center · Milton, Massachusetts
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