Wednesday, December 14, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, DECEMBER 14, 2016

ANOTHER SUNNY DAY AND TEMPS REACHING SEASONABLE LEVELS

Skies had cleared to just a few cumulus by early afternoon,
but distant fog persisted all day leaving us with a max. of
50 miles visibility in all directions at 1:00PM.  Winds
continued to flow out of the W-NW and were gusting up to 30 MPH.

Today’s temperatures have remained consistent with those of
previous days.  The 6-hr. max. at 1:00PM of 40F was equal to
the normal max. temp. for the day, while the overnight low of
30F was slightly warmer than the normal min. of 24F.

7 A.M.
Weather: Scattered altocumulus
Temperature: 30F; Dew Point: 27F; Wind: W at 10 kts
Sea-level pressure: 29.91 ins. Hg, falling then rising
Visibility: 20 miles, except 15 miles NNW-NNE,
distant fog in all directions
6-hr Max temp: 35F
6-hr Min temp: 30F
24-hr precip: 0.00 in.
BHO SA 1155 140 SCT 20 128/30/27/2810/991/ VSBY NNW-NNE 15
DSNT FG ALQDS/ 8/050 55006 10035 20030

10 A.M.
Weather: Few cumulus SW-NW, few altocumulus NE-S
Temperature: 37F; Dew Point: 23F; Wind: WNW at 12G18 kts
Sea-level pressure: 29.92 ins. Hg, steady, then rising slightly
Visibility: 35 miles, distant fog in all directions
BHO SA 1455 CLR 35 133/37/23/2912G18/992/ FEW CU SW-NW FEW AC
NE-S DSNT FG ALQDS/ 8/130 52005

1 P.M.
Weather: Few cumulus in all directions
Temperature: 39F; Dew Point: 18F; Wind: WNW at 14G22 kts,
Peak Wind: 26 kts (30 MPH) WNW at 12:13PM
Sea-level pressure: 29.85 ins. Hg, falling, then more slowly
Visibility: 50 miles, distant fog in all directions
6-hr Max temp: 40F
6-hr Min temp: 30F
BHO SA 1755 CLR 50 110/39/18/2914G22/985/ FEW CU ALQDS DSNT
FG ALQDS PK WND 2926/13/ 8/100 56023 10040 20030

SUMMARY FOR TUESDAY, DECEMBER 13, 2016

TEMPERATURE (DEGREES F)
MAX…..41   NORMAL…..40
MIN…..30   NORMAL…..25
MEAN….36   NORMAL…..32

DEPARTURE FROM 30-YEAR NORMAL……………………+4
TOTAL DEPARTURE FOR THE MONTH……………………-3 [-0.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..29   DEPARTURE……….-4
TOTAL HEATING UNITS FOR THE MONTH………….401   DEPARTURE……….+3
TOTAL HEATING UNITS FOR THE SEASON………..1431   DEPARTURE……..-229
TOTAL HEATING UNITS LAST SEASON TO DATE……1268   DIFFERENCE…….+163

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….25 WSW AT 2:15 A.M.
ASOS……………………26 W   AT 2:15 A.M.
DAVIS…………………..26 WSW AT 2:14 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………20 WSW AT 4:35 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………20 W   AT 4:37 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..18 WSW AT 2:14 A.M.
AVERAGE WIND SPEED AND DIRECTION………….11.6 SSE
ASOS………………….11.5
DAVIS…………………10.3 SW [220 Deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.84  DEPARTURE……-1.30
ASOS…………..0.93
TOTAL PRECIPITATION FOR THE YEAR……….37.81  DEPARTURE…..-12.86
ASOS………….38.36

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.5
TOTAL SNOWFALL FOR THE MONTH…………….1.7  DEPARTURE…….-2.8
TOTAL SNOWFALL FOR THE SEASON……………1.7  DEPARTURE…….-5.4

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 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

12/1  55/39/47/+10/0.20/0.0/385/69          36 W   AERO 37 W   RMY 36
12/2  48/34/41/+5/0.00/0.0/535/96           32 W   AERO 32 W   RMY N/A
13/3  44/31/38/+2/0.00/0.0/…/..           37 WNW AERO 39 WNW RMY 40
12/4  39/27/33/-2/0.00/0.0/…/..           25 NW  AERO 25 NW  RMY N/A
12/5  36/27/32/-3/0.13/0.4/…/..           26 W   AERO 25 W   RMY 29
12/6  42/30/36/+1/0.00/0.0/…/..           22 W   AERO 21 W   RMY N/A
12/7  39/34/37/+3/0.10/0.0/…/..           21 E   AERO 21 E   RMY N/A
12/8  40/29/35/+1/0.00/0.0/…/..           30 W   AERO 31 W   RMY 33
12/9  35/21/28/-6/0.00/0.0/…/..           35 W   AERO 36 WNW RMY 34
12/10 27/17/22/-11/0.00/0.0/…/..          26 WNW AERO 27 WNW RMY 29
12/11 33/16/25/-8/0.06/0.4/…/..           17 SSW AERO 15 SW  RMY N/A
12/12 41/27/34/+1/0.35/0.9/…/..           29 ESE AERO 29 SE  RMY 30
12/13 41/30/36/+4/0.00/0.0/…/..           25 WSW AERO 25 W   RMY 27

12/14 Low temp since midnight is 30F; normal low is now 24F

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

RECORDS FOR DECEMBER 14
HIGH 62 IN 1901
LOW -6 IN 1893
PRECIP 1.94 INS. IN 2002
SNOWFALL 8.0 INS. IN 1907
PEAK GUST 78e ENE IN 1941

RECORDS FOR DECEMBER 15
HIGH 64 IN 1975
LOW 4 IN 1900, 1905, 1933
PRECIP 1.80 INS. IN 1981
SNOW 7.5 INS. IN 1951
PEAK GUST 65 MPH NW IN 1991

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle